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5be215b9d0
In while-loop [1], 1. The first SetMatrix call that I remvoed in this patch is totally useless, we can just pass initialMatrix to contextPaint, instead of set initialMatrix to aContenxt and read back from aContext and then pass it to contextPaint. 2. This function, SVGTextFrame::PaintSVG, is the only caller of SetupStrokeGeometry, and it does not need SetupStrokeGeometry to setup matrix at all, since it will be overwritten the transform matrix of aContext at several lines below[2]. [1] https://hg.mozilla.org/mozilla-central/file/5115e2dea29a/layout/svg/SVGTextFrame.cpp#l3658 [2] https://hg.mozilla.org/mozilla-central/file/5115e2dea29a/layout/svg/SVGTextFrame.cpp#l3685 MozReview-Commit-ID: AlKQh4abbpa --HG-- extra : rebase_source : e0dfd66ff25be0d7cffadecf9e3333bba10cff9b
5586 lines
179 KiB
C++
5586 lines
179 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Main header first:
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#include "SVGTextFrame.h"
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// Keep others in (case-insensitive) order:
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#include "DOMSVGPoint.h"
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#include "gfx2DGlue.h"
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#include "gfxContext.h"
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#include "gfxFont.h"
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#include "gfxSkipChars.h"
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#include "gfxTypes.h"
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#include "gfxUtils.h"
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#include "LookAndFeel.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/PatternHelpers.h"
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#include "mozilla/Likely.h"
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#include "nsAlgorithm.h"
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#include "nsBlockFrame.h"
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#include "nsCaret.h"
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#include "nsContentUtils.h"
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#include "nsGkAtoms.h"
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#include "nsIDOMSVGLength.h"
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#include "nsISelection.h"
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#include "nsQuickSort.h"
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#include "nsSVGEffects.h"
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#include "nsSVGOuterSVGFrame.h"
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#include "nsSVGPaintServerFrame.h"
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#include "mozilla/dom/SVGRect.h"
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#include "nsSVGIntegrationUtils.h"
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#include "nsSVGUtils.h"
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#include "nsTArray.h"
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#include "nsTextFrame.h"
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#include "nsTextNode.h"
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#include "SVGAnimatedNumberList.h"
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#include "SVGContentUtils.h"
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#include "SVGContextPaint.h"
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#include "SVGLengthList.h"
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#include "SVGNumberList.h"
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#include "SVGPathElement.h"
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#include "SVGTextPathElement.h"
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#include "nsLayoutUtils.h"
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#include "nsFrameSelection.h"
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#include "nsStyleStructInlines.h"
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#include <algorithm>
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#include <cmath>
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#include <limits>
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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using namespace mozilla::image;
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// ============================================================================
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// Utility functions
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/**
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* Using the specified gfxSkipCharsIterator, converts an offset and length
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* in original char indexes to skipped char indexes.
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*
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* @param aIterator The gfxSkipCharsIterator to use for the conversion.
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* @param aOriginalOffset The original offset.
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* @param aOriginalLength The original length.
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*/
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static gfxTextRun::Range
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ConvertOriginalToSkipped(gfxSkipCharsIterator& aIterator,
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uint32_t aOriginalOffset, uint32_t aOriginalLength)
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{
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uint32_t start = aIterator.ConvertOriginalToSkipped(aOriginalOffset);
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aIterator.AdvanceOriginal(aOriginalLength);
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return gfxTextRun::Range(start, aIterator.GetSkippedOffset());
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}
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/**
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* Converts an nsPoint from app units to user space units using the specified
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* nsPresContext and returns it as a gfxPoint.
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*/
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static gfxPoint
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AppUnitsToGfxUnits(const nsPoint& aPoint, const nsPresContext* aContext)
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{
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return gfxPoint(aContext->AppUnitsToGfxUnits(aPoint.x),
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aContext->AppUnitsToGfxUnits(aPoint.y));
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}
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/**
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* Converts a gfxRect that is in app units to CSS pixels using the specified
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* nsPresContext and returns it as a gfxRect.
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*/
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static gfxRect
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AppUnitsToFloatCSSPixels(const gfxRect& aRect, const nsPresContext* aContext)
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{
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return gfxRect(aContext->AppUnitsToFloatCSSPixels(aRect.x),
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aContext->AppUnitsToFloatCSSPixels(aRect.y),
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aContext->AppUnitsToFloatCSSPixels(aRect.width),
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aContext->AppUnitsToFloatCSSPixels(aRect.height));
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}
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/**
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* Scales a gfxRect around a given point.
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*
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* @param aRect The rectangle to scale.
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* @param aPoint The point around which to scale.
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* @param aScale The scale amount.
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*/
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static void
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ScaleAround(gfxRect& aRect, const gfxPoint& aPoint, double aScale)
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{
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aRect.x = aPoint.x - aScale * (aPoint.x - aRect.x);
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aRect.y = aPoint.y - aScale * (aPoint.y - aRect.y);
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aRect.width *= aScale;
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aRect.height *= aScale;
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}
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/**
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* Returns whether a gfxPoint lies within a gfxRect.
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*/
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static bool
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Inside(const gfxRect& aRect, const gfxPoint& aPoint)
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{
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return aPoint.x >= aRect.x &&
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aPoint.x < aRect.XMost() &&
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aPoint.y >= aRect.y &&
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aPoint.y < aRect.YMost();
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}
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/**
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* Gets the measured ascent and descent of the text in the given nsTextFrame
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* in app units.
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*
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* @param aFrame The text frame.
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* @param aAscent The ascent in app units (output).
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* @param aDescent The descent in app units (output).
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*/
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static void
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GetAscentAndDescentInAppUnits(nsTextFrame* aFrame,
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gfxFloat& aAscent, gfxFloat& aDescent)
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{
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gfxSkipCharsIterator it = aFrame->EnsureTextRun(nsTextFrame::eInflated);
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gfxTextRun* textRun = aFrame->GetTextRun(nsTextFrame::eInflated);
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gfxTextRun::Range range = ConvertOriginalToSkipped(
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it, aFrame->GetContentOffset(), aFrame->GetContentLength());
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gfxTextRun::Metrics metrics =
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textRun->MeasureText(range, gfxFont::LOOSE_INK_EXTENTS, nullptr, nullptr);
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aAscent = metrics.mAscent;
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aDescent = metrics.mDescent;
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}
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/**
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* Updates an interval by intersecting it with another interval.
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* The intervals are specified using a start index and a length.
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*/
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static void
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IntersectInterval(uint32_t& aStart, uint32_t& aLength,
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uint32_t aStartOther, uint32_t aLengthOther)
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{
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uint32_t aEnd = aStart + aLength;
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uint32_t aEndOther = aStartOther + aLengthOther;
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if (aStartOther >= aEnd || aStart >= aEndOther) {
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aLength = 0;
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} else {
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if (aStartOther >= aStart)
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aStart = aStartOther;
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aLength = std::min(aEnd, aEndOther) - aStart;
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}
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}
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/**
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* Intersects an interval as IntersectInterval does but by taking
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* the offset and length of the other interval from a
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* nsTextFrame::TrimmedOffsets object.
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*/
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static void
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TrimOffsets(uint32_t& aStart, uint32_t& aLength,
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const nsTextFrame::TrimmedOffsets& aTrimmedOffsets)
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{
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IntersectInterval(aStart, aLength,
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aTrimmedOffsets.mStart, aTrimmedOffsets.mLength);
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}
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/**
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* Returns the closest ancestor-or-self node that is not an SVG <a>
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* element.
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*/
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static nsIContent*
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GetFirstNonAAncestor(nsIContent* aContent)
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{
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while (aContent && aContent->IsSVGElement(nsGkAtoms::a)) {
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aContent = aContent->GetParent();
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}
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return aContent;
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}
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/**
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* Returns whether the given node is a text content element[1], taking into
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* account whether it has a valid parent.
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*
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* For example, in:
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*
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* <svg xmlns="http://www.w3.org/2000/svg">
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* <text><a/><text/></text>
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* <tspan/>
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* </svg>
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*
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* true would be returned for the outer <text> element and the <a> element,
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* and false for the inner <text> element (since a <text> is not allowed
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* to be a child of another <text>) and the <tspan> element (because it
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* must be inside a <text> subtree).
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*
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* Note that we don't support the <tref> element yet and this function
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* returns false for it.
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*
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* [1] https://svgwg.org/svg2-draft/intro.html#TermTextContentElement
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*/
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static bool
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IsTextContentElement(nsIContent* aContent)
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{
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if (aContent->IsSVGElement(nsGkAtoms::text)) {
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nsIContent* parent = GetFirstNonAAncestor(aContent->GetParent());
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return !parent || !IsTextContentElement(parent);
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}
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if (aContent->IsSVGElement(nsGkAtoms::textPath)) {
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nsIContent* parent = GetFirstNonAAncestor(aContent->GetParent());
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return parent && parent->IsSVGElement(nsGkAtoms::text);
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}
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if (aContent->IsAnyOfSVGElements(nsGkAtoms::a,
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nsGkAtoms::tspan)) {
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return true;
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}
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return false;
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}
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/**
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* Returns whether the specified frame is an nsTextFrame that has some text
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* content.
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*/
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static bool
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IsNonEmptyTextFrame(nsIFrame* aFrame)
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{
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nsTextFrame* textFrame = do_QueryFrame(aFrame);
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if (!textFrame) {
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return false;
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}
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return textFrame->GetContentLength() != 0;
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}
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/**
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* Takes an nsIFrame and if it is a text frame that has some text content,
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* returns it as an nsTextFrame and its corresponding nsTextNode.
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*
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* @param aFrame The frame to look at.
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* @param aTextFrame aFrame as an nsTextFrame (output).
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* @param aTextNode The nsTextNode content of aFrame (output).
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* @return true if aFrame is a non-empty text frame, false otherwise.
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*/
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static bool
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GetNonEmptyTextFrameAndNode(nsIFrame* aFrame,
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nsTextFrame*& aTextFrame,
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nsTextNode*& aTextNode)
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{
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nsTextFrame* text = do_QueryFrame(aFrame);
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bool isNonEmptyTextFrame = text && text->GetContentLength() != 0;
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if (isNonEmptyTextFrame) {
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nsIContent* content = text->GetContent();
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NS_ASSERTION(content && content->IsNodeOfType(nsINode::eTEXT),
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"unexpected content type for nsTextFrame");
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nsTextNode* node = static_cast<nsTextNode*>(content);
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MOZ_ASSERT(node->TextLength() != 0,
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"frame's GetContentLength() should be 0 if the text node "
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"has no content");
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aTextFrame = text;
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aTextNode = node;
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}
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MOZ_ASSERT(IsNonEmptyTextFrame(aFrame) == isNonEmptyTextFrame,
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"our logic should agree with IsNonEmptyTextFrame");
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return isNonEmptyTextFrame;
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}
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/**
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* Returns whether the specified atom is for one of the five
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* glyph positioning attributes that can appear on SVG text
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* elements -- x, y, dx, dy or rotate.
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*/
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static bool
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IsGlyphPositioningAttribute(nsIAtom* aAttribute)
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{
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return aAttribute == nsGkAtoms::x ||
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aAttribute == nsGkAtoms::y ||
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aAttribute == nsGkAtoms::dx ||
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aAttribute == nsGkAtoms::dy ||
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aAttribute == nsGkAtoms::rotate;
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}
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/**
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* Returns the position in app units of a given baseline (using an
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* SVG dominant-baseline property value) for a given nsTextFrame.
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*
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* @param aFrame The text frame to inspect.
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* @param aTextRun The text run of aFrame.
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* @param aDominantBaseline The dominant-baseline value to use.
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*/
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static nscoord
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GetBaselinePosition(nsTextFrame* aFrame,
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gfxTextRun* aTextRun,
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uint8_t aDominantBaseline,
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float aFontSizeScaleFactor)
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{
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WritingMode writingMode = aFrame->GetWritingMode();
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gfxTextRun::Metrics metrics =
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aTextRun->MeasureText(gfxFont::LOOSE_INK_EXTENTS, nullptr);
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switch (aDominantBaseline) {
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case NS_STYLE_DOMINANT_BASELINE_HANGING:
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case NS_STYLE_DOMINANT_BASELINE_TEXT_BEFORE_EDGE:
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return writingMode.IsVerticalRL()
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? metrics.mAscent + metrics.mDescent : 0;
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case NS_STYLE_DOMINANT_BASELINE_USE_SCRIPT:
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case NS_STYLE_DOMINANT_BASELINE_NO_CHANGE:
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case NS_STYLE_DOMINANT_BASELINE_RESET_SIZE:
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// These three should not simply map to 'baseline', but we don't
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// support the complex baseline model that SVG 1.1 has and which
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// css3-linebox now defines.
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// (fall through)
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case NS_STYLE_DOMINANT_BASELINE_AUTO:
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case NS_STYLE_DOMINANT_BASELINE_ALPHABETIC:
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return writingMode.IsVerticalRL()
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? metrics.mAscent + metrics.mDescent -
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aFrame->GetLogicalBaseline(writingMode)
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: aFrame->GetLogicalBaseline(writingMode);
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case NS_STYLE_DOMINANT_BASELINE_MIDDLE:
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return aFrame->GetLogicalBaseline(writingMode) -
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SVGContentUtils::GetFontXHeight(aFrame) / 2.0 *
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aFrame->PresContext()->AppUnitsPerCSSPixel() * aFontSizeScaleFactor;
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case NS_STYLE_DOMINANT_BASELINE_TEXT_AFTER_EDGE:
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case NS_STYLE_DOMINANT_BASELINE_IDEOGRAPHIC:
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return writingMode.IsVerticalLR()
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? 0 : metrics.mAscent + metrics.mDescent;
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case NS_STYLE_DOMINANT_BASELINE_CENTRAL:
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case NS_STYLE_DOMINANT_BASELINE_MATHEMATICAL:
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return (metrics.mAscent + metrics.mDescent) / 2.0;
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}
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NS_NOTREACHED("unexpected dominant-baseline value");
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return aFrame->GetLogicalBaseline(writingMode);
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}
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/**
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* For a given text run, returns the range of skipped characters that comprise
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* the ligature group and/or cluster that includes the character represented
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* by the specified gfxSkipCharsIterator.
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*
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* @param aTextRun The text run to use for determining whether a given character
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* is part of a ligature or cluster.
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* @param aIterator The gfxSkipCharsIterator to use for the current position
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* in the text run.
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*/
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static gfxTextRun::Range
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ClusterRange(gfxTextRun* aTextRun, const gfxSkipCharsIterator& aIterator)
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{
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uint32_t start = aIterator.GetSkippedOffset();
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uint32_t end = start + 1;
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while (end < aTextRun->GetLength() &&
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(!aTextRun->IsLigatureGroupStart(end) ||
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!aTextRun->IsClusterStart(end))) {
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end++;
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}
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return gfxTextRun::Range(start, end);
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}
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/**
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* Truncates an array to be at most the length of another array.
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*
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* @param aArrayToTruncate The array to truncate.
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* @param aReferenceArray The array whose length will be used to truncate
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* aArrayToTruncate to.
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*/
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template<typename T, typename U>
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static void
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TruncateTo(nsTArray<T>& aArrayToTruncate, const nsTArray<U>& aReferenceArray)
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{
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uint32_t length = aReferenceArray.Length();
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if (aArrayToTruncate.Length() > length) {
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aArrayToTruncate.TruncateLength(length);
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}
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}
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/**
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|
* Asserts that the anonymous block child of the SVGTextFrame has been
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* reflowed (or does not exist). Returns null if the child has not been
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* reflowed, and the frame otherwise.
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*
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* We check whether the kid has been reflowed and not the frame itself
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* since we sometimes need to call this function during reflow, after the
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* kid has been reflowed but before we have cleared the dirty bits on the
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* frame itself.
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*/
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static SVGTextFrame*
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FrameIfAnonymousChildReflowed(SVGTextFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "aFrame must not be null");
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nsIFrame* kid = aFrame->PrincipalChildList().FirstChild();
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if (NS_SUBTREE_DIRTY(kid)) {
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MOZ_ASSERT(false, "should have already reflowed the anonymous block child");
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return nullptr;
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}
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return aFrame;
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}
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static double
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GetContextScale(const gfxMatrix& aMatrix)
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{
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// The context scale is the ratio of the length of the transformed
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// diagonal vector (1,1) to the length of the untransformed diagonal
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// (which is sqrt(2)).
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gfxPoint p = aMatrix.TransformPoint(gfxPoint(1, 1)) -
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aMatrix.TransformPoint(gfxPoint(0, 0));
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return SVGContentUtils::ComputeNormalizedHypotenuse(p.x, p.y);
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}
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|
|
// ============================================================================
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|
// Utility classes
|
|
|
|
namespace mozilla {
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|
|
|
// ----------------------------------------------------------------------------
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|
// TextRenderedRun
|
|
|
|
/**
|
|
* A run of text within a single nsTextFrame whose glyphs can all be painted
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|
* with a single call to nsTextFrame::PaintText. A text rendered run can
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* be created for a sequence of two or more consecutive glyphs as long as:
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*
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|
* - Only the first glyph has (or none of the glyphs have) been positioned
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* with SVG text positioning attributes
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* - All of the glyphs have zero rotation
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* - The glyphs are not on a text path
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* - The glyphs correspond to content within the one nsTextFrame
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*
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* A TextRenderedRunIterator produces TextRenderedRuns required for painting a
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* whole SVGTextFrame.
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*/
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struct TextRenderedRun
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|
{
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typedef gfxTextRun::Range Range;
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|
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/**
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|
* Constructs a TextRenderedRun that is uninitialized except for mFrame
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* being null.
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*/
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|
TextRenderedRun()
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|
: mFrame(nullptr)
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|
{
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|
}
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|
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/**
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|
* Constructs a TextRenderedRun with all of the information required to
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* paint it. See the comments documenting the member variables below
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|
* for descriptions of the arguments.
|
|
*/
|
|
TextRenderedRun(nsTextFrame* aFrame, const gfxPoint& aPosition,
|
|
float aLengthAdjustScaleFactor, double aRotate,
|
|
float aFontSizeScaleFactor, nscoord aBaseline,
|
|
uint32_t aTextFrameContentOffset,
|
|
uint32_t aTextFrameContentLength,
|
|
uint32_t aTextElementCharIndex)
|
|
: mFrame(aFrame),
|
|
mPosition(aPosition),
|
|
mLengthAdjustScaleFactor(aLengthAdjustScaleFactor),
|
|
mRotate(static_cast<float>(aRotate)),
|
|
mFontSizeScaleFactor(aFontSizeScaleFactor),
|
|
mBaseline(aBaseline),
|
|
mTextFrameContentOffset(aTextFrameContentOffset),
|
|
mTextFrameContentLength(aTextFrameContentLength),
|
|
mTextElementCharIndex(aTextElementCharIndex)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Returns the text run for the text frame that this rendered run is part of.
|
|
*/
|
|
gfxTextRun* GetTextRun() const
|
|
{
|
|
mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
|
return mFrame->GetTextRun(nsTextFrame::eInflated);
|
|
}
|
|
|
|
/**
|
|
* Returns whether this rendered run is RTL.
|
|
*/
|
|
bool IsRightToLeft() const
|
|
{
|
|
return GetTextRun()->IsRightToLeft();
|
|
}
|
|
|
|
/**
|
|
* Returns whether this rendered run is vertical.
|
|
*/
|
|
bool IsVertical() const
|
|
{
|
|
return GetTextRun()->IsVertical();
|
|
}
|
|
|
|
/**
|
|
* Returns the transform that converts from a <text> element's user space into
|
|
* the coordinate space that rendered runs can be painted directly in.
|
|
*
|
|
* The difference between this method and GetTransformFromRunUserSpaceToUserSpace
|
|
* is that when calling in to nsTextFrame::PaintText, it will already take
|
|
* into account any left clip edge (that is, it doesn't just apply a visual
|
|
* clip to the rendered text, it shifts the glyphs over so that they are
|
|
* painted with their left edge at the x coordinate passed in to it).
|
|
* Thus we need to account for this in our transform.
|
|
*
|
|
*
|
|
* Assume that we have <text x="100" y="100" rotate="0 0 1 0 0 1">abcdef</text>.
|
|
* This would result in four text rendered runs:
|
|
*
|
|
* - one for "ab"
|
|
* - one for "c"
|
|
* - one for "de"
|
|
* - one for "f"
|
|
*
|
|
* Assume now that we are painting the third TextRenderedRun. It will have
|
|
* a left clip edge that is the sum of the advances of "abc", and it will
|
|
* have a right clip edge that is the advance of "f". In
|
|
* SVGTextFrame::PaintSVG(), we pass in nsPoint() (i.e., the origin)
|
|
* as the point at which to paint the text frame, and we pass in the
|
|
* clip edge values. The nsTextFrame will paint the substring of its
|
|
* text such that the top-left corner of the "d"'s glyph cell will be at
|
|
* (0, 0) in the current coordinate system.
|
|
*
|
|
* Thus, GetTransformFromUserSpaceForPainting must return a transform from
|
|
* whatever user space the <text> element is in to a coordinate space in
|
|
* device pixels (as that's what nsTextFrame works in) where the origin is at
|
|
* the same position as our user space mPositions[i].mPosition value for
|
|
* the "d" glyph, which will be (100 + userSpaceAdvance("abc"), 100).
|
|
* The translation required to do this (ignoring the scale to get from
|
|
* user space to device pixels, and ignoring the
|
|
* (100 + userSpaceAdvance("abc"), 100) translation) is:
|
|
*
|
|
* (-leftEdge, -baseline)
|
|
*
|
|
* where baseline is the distance between the baseline of the text and the top
|
|
* edge of the nsTextFrame. We translate by -leftEdge horizontally because
|
|
* the nsTextFrame will already shift the glyphs over by that amount and start
|
|
* painting glyphs at x = 0. We translate by -baseline vertically so that
|
|
* painting the top edges of the glyphs at y = 0 will result in their
|
|
* baselines being at our desired y position.
|
|
*
|
|
*
|
|
* Now for an example with RTL text. Assume our content is now
|
|
* <text x="100" y="100" rotate="0 0 1 0 0 1">WERBEH</text>. We'd have
|
|
* the following text rendered runs:
|
|
*
|
|
* - one for "EH"
|
|
* - one for "B"
|
|
* - one for "ER"
|
|
* - one for "W"
|
|
*
|
|
* Again, we are painting the third TextRenderedRun. The left clip edge
|
|
* is the advance of the "W" and the right clip edge is the sum of the
|
|
* advances of "BEH". Our translation to get the rendered "ER" glyphs
|
|
* in the right place this time is:
|
|
*
|
|
* (-frameWidth + rightEdge, -baseline)
|
|
*
|
|
* which is equivalent to:
|
|
*
|
|
* (-(leftEdge + advance("ER")), -baseline)
|
|
*
|
|
* The reason we have to shift left additionally by the width of the run
|
|
* of glyphs we are painting is that although the nsTextFrame is RTL,
|
|
* we still supply the top-left corner to paint the frame at when calling
|
|
* nsTextFrame::PaintText, even though our user space positions for each
|
|
* glyph in mPositions specifies the origin of each glyph, which for RTL
|
|
* glyphs is at the right edge of the glyph cell.
|
|
*
|
|
*
|
|
* For any other use of an nsTextFrame in the context of a particular run
|
|
* (such as hit testing, or getting its rectangle),
|
|
* GetTransformFromRunUserSpaceToUserSpace should be used.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
* @param aItem The nsCharClipDisplayItem that holds the amount of clipping
|
|
* from the left and right edges of the text frame for this rendered run.
|
|
* An appropriate nsCharClipDisplayItem can be obtained by constructing an
|
|
* SVGCharClipDisplayItem for the TextRenderedRun.
|
|
*/
|
|
gfxMatrix GetTransformFromUserSpaceForPainting(
|
|
nsPresContext* aContext,
|
|
const nsCharClipDisplayItem& aItem) const;
|
|
|
|
/**
|
|
* Returns the transform that converts from "run user space" to a <text>
|
|
* element's user space. Run user space is a coordinate system that has the
|
|
* same size as the <text>'s user space but rotated and translated such that
|
|
* (0,0) is the top-left of the rectangle that bounds the text.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
*/
|
|
gfxMatrix GetTransformFromRunUserSpaceToUserSpace(nsPresContext* aContext) const;
|
|
|
|
/**
|
|
* Returns the transform that converts from "run user space" to float pixels
|
|
* relative to the nsTextFrame that this rendered run is a part of.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
*/
|
|
gfxMatrix GetTransformFromRunUserSpaceToFrameUserSpace(nsPresContext* aContext) const;
|
|
|
|
/**
|
|
* Flag values used for the aFlags arguments of GetRunUserSpaceRect,
|
|
* GetFrameUserSpaceRect and GetUserSpaceRect.
|
|
*/
|
|
enum {
|
|
// Includes the fill geometry of the text in the returned rectangle.
|
|
eIncludeFill = 1,
|
|
// Includes the stroke geometry of the text in the returned rectangle.
|
|
eIncludeStroke = 2,
|
|
// Includes any text shadow in the returned rectangle.
|
|
eIncludeTextShadow = 4,
|
|
// Don't include any horizontal glyph overflow in the returned rectangle.
|
|
eNoHorizontalOverflow = 8
|
|
};
|
|
|
|
/**
|
|
* Returns a rectangle that bounds the fill and/or stroke of the rendered run
|
|
* in run user space.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
* @param aFlags A combination of the flags above (eIncludeFill and
|
|
* eIncludeStroke) indicating what parts of the text to include in
|
|
* the rectangle.
|
|
*/
|
|
SVGBBox GetRunUserSpaceRect(nsPresContext* aContext, uint32_t aFlags) const;
|
|
|
|
/**
|
|
* Returns a rectangle that covers the fill and/or stroke of the rendered run
|
|
* in "frame user space".
|
|
*
|
|
* Frame user space is a coordinate space of the same scale as the <text>
|
|
* element's user space, but with its rotation set to the rotation of
|
|
* the glyphs within this rendered run and its origin set to the position
|
|
* such that placing the nsTextFrame there would result in the glyphs in
|
|
* this rendered run being at their correct positions.
|
|
*
|
|
* For example, say we have <text x="100 150" y="100">ab</text>. Assume
|
|
* the advance of both the "a" and the "b" is 12 user units, and the
|
|
* ascent of the text is 8 user units and its descent is 6 user units,
|
|
* and that we are not measuing the stroke of the text, so that we stay
|
|
* entirely within the glyph cells.
|
|
*
|
|
* There will be two text rendered runs, one for "a" and one for "b".
|
|
*
|
|
* The frame user space for the "a" run will have its origin at
|
|
* (100, 100 - 8) in the <text> element's user space and will have its
|
|
* axes aligned with the user space (since there is no rotate="" or
|
|
* text path involve) and with its scale the same as the user space.
|
|
* The rect returned by this method will be (0, 0, 12, 14), since the "a"
|
|
* glyph is right at the left of the nsTextFrame.
|
|
*
|
|
* The frame user space for the "b" run will have its origin at
|
|
* (150 - 12, 100 - 8), and scale/rotation the same as above. The rect
|
|
* returned by this method will be (12, 0, 12, 14), since we are
|
|
* advance("a") horizontally in to the text frame.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
* @param aFlags A combination of the flags above (eIncludeFill and
|
|
* eIncludeStroke) indicating what parts of the text to include in
|
|
* the rectangle.
|
|
*/
|
|
SVGBBox GetFrameUserSpaceRect(nsPresContext* aContext, uint32_t aFlags) const;
|
|
|
|
/**
|
|
* Returns a rectangle that covers the fill and/or stroke of the rendered run
|
|
* in the <text> element's user space.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
* @param aFlags A combination of the flags above indicating what parts of the
|
|
* text to include in the rectangle.
|
|
* @param aAdditionalTransform An additional transform to apply to the
|
|
* frame user space rectangle before its bounds are transformed into
|
|
* user space.
|
|
*/
|
|
SVGBBox GetUserSpaceRect(nsPresContext* aContext, uint32_t aFlags,
|
|
const gfxMatrix* aAdditionalTransform = nullptr) const;
|
|
|
|
/**
|
|
* Gets the app unit amounts to clip from the left and right edges of
|
|
* the nsTextFrame in order to paint just this rendered run.
|
|
*
|
|
* Note that if clip edge amounts land in the middle of a glyph, the
|
|
* glyph won't be painted at all. The clip edges are thus more of
|
|
* a selection mechanism for which glyphs will be painted, rather
|
|
* than a geometric clip.
|
|
*/
|
|
void GetClipEdges(nscoord& aVisIStartEdge, nscoord& aVisIEndEdge) const;
|
|
|
|
/**
|
|
* Returns the advance width of the whole rendered run.
|
|
*/
|
|
nscoord GetAdvanceWidth() const;
|
|
|
|
/**
|
|
* Returns the index of the character into this rendered run whose
|
|
* glyph cell contains the given point, or -1 if there is no such
|
|
* character. This does not hit test against any overflow.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
* @param aPoint The point in the user space of the <text> element.
|
|
*/
|
|
int32_t GetCharNumAtPosition(nsPresContext* aContext,
|
|
const gfxPoint& aPoint) const;
|
|
|
|
/**
|
|
* The text frame that this rendered run lies within.
|
|
*/
|
|
nsTextFrame* mFrame;
|
|
|
|
/**
|
|
* The point in user space that the text is positioned at.
|
|
*
|
|
* For a horizontal run:
|
|
* The x coordinate is the left edge of a LTR run of text or the right edge of
|
|
* an RTL run. The y coordinate is the baseline of the text.
|
|
* For a vertical run:
|
|
* The x coordinate is the baseline of the text.
|
|
* The y coordinate is the top edge of a LTR run, or bottom of RTL.
|
|
*/
|
|
gfxPoint mPosition;
|
|
|
|
/**
|
|
* The horizontal scale factor to apply when painting glyphs to take
|
|
* into account textLength="".
|
|
*/
|
|
float mLengthAdjustScaleFactor;
|
|
|
|
/**
|
|
* The rotation in radians in the user coordinate system that the text has.
|
|
*/
|
|
float mRotate;
|
|
|
|
/**
|
|
* The scale factor that was used to transform the text run's original font
|
|
* size into a sane range for painting and measurement.
|
|
*/
|
|
double mFontSizeScaleFactor;
|
|
|
|
/**
|
|
* The baseline in app units of this text run. The measurement is from the
|
|
* top of the text frame. (From the left edge if vertical.)
|
|
*/
|
|
nscoord mBaseline;
|
|
|
|
/**
|
|
* The offset and length in mFrame's content nsTextNode that corresponds to
|
|
* this text rendered run. These are original char indexes.
|
|
*/
|
|
uint32_t mTextFrameContentOffset;
|
|
uint32_t mTextFrameContentLength;
|
|
|
|
/**
|
|
* The character index in the whole SVG <text> element that this text rendered
|
|
* run begins at.
|
|
*/
|
|
uint32_t mTextElementCharIndex;
|
|
};
|
|
|
|
gfxMatrix
|
|
TextRenderedRun::GetTransformFromUserSpaceForPainting(
|
|
nsPresContext* aContext,
|
|
const nsCharClipDisplayItem& aItem) const
|
|
{
|
|
// We transform to device pixels positioned such that painting the text frame
|
|
// at (0,0) with aItem will result in the text being in the right place.
|
|
|
|
gfxMatrix m;
|
|
if (!mFrame) {
|
|
return m;
|
|
}
|
|
|
|
float cssPxPerDevPx = aContext->
|
|
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
|
|
|
// Glyph position in user space.
|
|
m.PreTranslate(mPosition / cssPxPerDevPx);
|
|
|
|
// Take into account any font size scaling and scaling due to textLength="".
|
|
m.PreScale(1.0 / mFontSizeScaleFactor, 1.0 / mFontSizeScaleFactor);
|
|
|
|
// Rotation due to rotate="" or a <textPath>.
|
|
m.PreRotate(mRotate);
|
|
|
|
m.PreScale(mLengthAdjustScaleFactor, 1.0);
|
|
|
|
// Translation to get the text frame in the right place.
|
|
nsPoint t;
|
|
if (IsVertical()) {
|
|
t = nsPoint(-mBaseline,
|
|
IsRightToLeft()
|
|
? -mFrame->GetRect().height + aItem.mVisIEndEdge
|
|
: -aItem.mVisIStartEdge);
|
|
} else {
|
|
t = nsPoint(IsRightToLeft()
|
|
? -mFrame->GetRect().width + aItem.mVisIEndEdge
|
|
: -aItem.mVisIStartEdge,
|
|
-mBaseline);
|
|
}
|
|
m.PreTranslate(AppUnitsToGfxUnits(t, aContext));
|
|
|
|
return m;
|
|
}
|
|
|
|
gfxMatrix
|
|
TextRenderedRun::GetTransformFromRunUserSpaceToUserSpace(
|
|
nsPresContext* aContext) const
|
|
{
|
|
gfxMatrix m;
|
|
if (!mFrame) {
|
|
return m;
|
|
}
|
|
|
|
float cssPxPerDevPx = aContext->
|
|
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
|
|
|
nscoord start, end;
|
|
GetClipEdges(start, end);
|
|
|
|
// Glyph position in user space.
|
|
m.PreTranslate(mPosition);
|
|
|
|
// Rotation due to rotate="" or a <textPath>.
|
|
m.PreRotate(mRotate);
|
|
|
|
// Scale due to textLength="".
|
|
m.PreScale(mLengthAdjustScaleFactor, 1.0);
|
|
|
|
// Translation to get the text frame in the right place.
|
|
nsPoint t;
|
|
if (IsVertical()) {
|
|
t = nsPoint(-mBaseline,
|
|
IsRightToLeft()
|
|
? -mFrame->GetRect().height + start + end
|
|
: 0);
|
|
} else {
|
|
t = nsPoint(IsRightToLeft()
|
|
? -mFrame->GetRect().width + start + end
|
|
: 0,
|
|
-mBaseline);
|
|
}
|
|
m.PreTranslate(AppUnitsToGfxUnits(t, aContext) *
|
|
cssPxPerDevPx / mFontSizeScaleFactor);
|
|
|
|
return m;
|
|
}
|
|
|
|
gfxMatrix
|
|
TextRenderedRun::GetTransformFromRunUserSpaceToFrameUserSpace(
|
|
nsPresContext* aContext) const
|
|
{
|
|
gfxMatrix m;
|
|
if (!mFrame) {
|
|
return m;
|
|
}
|
|
|
|
nscoord start, end;
|
|
GetClipEdges(start, end);
|
|
|
|
// Translate by the horizontal distance into the text frame this
|
|
// rendered run is.
|
|
gfxFloat appPerCssPx = aContext->AppUnitsPerCSSPixel();
|
|
gfxPoint t = IsVertical() ? gfxPoint(0, start / appPerCssPx)
|
|
: gfxPoint(start / appPerCssPx, 0);
|
|
return m.PreTranslate(t);
|
|
}
|
|
|
|
SVGBBox
|
|
TextRenderedRun::GetRunUserSpaceRect(nsPresContext* aContext,
|
|
uint32_t aFlags) const
|
|
{
|
|
SVGBBox r;
|
|
if (!mFrame) {
|
|
return r;
|
|
}
|
|
|
|
// Determine the amount of overflow above and below the frame's mRect.
|
|
//
|
|
// We need to call GetVisualOverflowRectRelativeToSelf because this includes
|
|
// overflowing decorations, which the MeasureText call below does not. We
|
|
// assume here the decorations only overflow above and below the frame, never
|
|
// horizontally.
|
|
nsRect self = mFrame->GetVisualOverflowRectRelativeToSelf();
|
|
nsRect rect = mFrame->GetRect();
|
|
bool vertical = IsVertical();
|
|
nscoord above = vertical ? -self.x : -self.y;
|
|
nscoord below = vertical ? self.XMost() - rect.width
|
|
: self.YMost() - rect.height;
|
|
|
|
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
|
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
|
|
|
// Get the content range for this rendered run.
|
|
Range range = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
|
mTextFrameContentLength);
|
|
if (range.Length() == 0) {
|
|
return r;
|
|
}
|
|
|
|
// Measure that range.
|
|
gfxTextRun::Metrics metrics =
|
|
textRun->MeasureText(range, gfxFont::LOOSE_INK_EXTENTS, nullptr, nullptr);
|
|
// Make sure it includes the font-box.
|
|
gfxRect fontBox(0, -metrics.mAscent,
|
|
metrics.mAdvanceWidth, metrics.mAscent + metrics.mDescent);
|
|
metrics.mBoundingBox.UnionRect(metrics.mBoundingBox, fontBox);
|
|
|
|
// Determine the rectangle that covers the rendered run's fill,
|
|
// taking into account the measured vertical overflow due to
|
|
// decorations.
|
|
nscoord baseline = metrics.mBoundingBox.y + metrics.mAscent;
|
|
gfxFloat x, width;
|
|
if (aFlags & eNoHorizontalOverflow) {
|
|
x = 0.0;
|
|
width = textRun->GetAdvanceWidth(range, nullptr);
|
|
} else {
|
|
x = metrics.mBoundingBox.x;
|
|
width = metrics.mBoundingBox.width;
|
|
}
|
|
nsRect fillInAppUnits(x, baseline - above,
|
|
width, metrics.mBoundingBox.height + above + below);
|
|
if (textRun->IsVertical()) {
|
|
// Swap line-relative textMetrics dimensions to physical coordinates.
|
|
Swap(fillInAppUnits.x, fillInAppUnits.y);
|
|
Swap(fillInAppUnits.width, fillInAppUnits.height);
|
|
}
|
|
|
|
// Account for text-shadow.
|
|
if (aFlags & eIncludeTextShadow) {
|
|
fillInAppUnits =
|
|
nsLayoutUtils::GetTextShadowRectsUnion(fillInAppUnits, mFrame);
|
|
}
|
|
|
|
// Convert the app units rectangle to user units.
|
|
gfxRect fill = AppUnitsToFloatCSSPixels(gfxRect(fillInAppUnits.x,
|
|
fillInAppUnits.y,
|
|
fillInAppUnits.width,
|
|
fillInAppUnits.height),
|
|
aContext);
|
|
|
|
// Scale the rectangle up due to any mFontSizeScaleFactor. We scale
|
|
// it around the text's origin.
|
|
ScaleAround(fill,
|
|
textRun->IsVertical()
|
|
? gfxPoint(aContext->AppUnitsToFloatCSSPixels(baseline), 0.0)
|
|
: gfxPoint(0.0, aContext->AppUnitsToFloatCSSPixels(baseline)),
|
|
1.0 / mFontSizeScaleFactor);
|
|
|
|
// Include the fill if requested.
|
|
if (aFlags & eIncludeFill) {
|
|
r = fill;
|
|
}
|
|
|
|
// Include the stroke if requested.
|
|
if ((aFlags & eIncludeStroke) &&
|
|
!fill.IsEmpty() &&
|
|
nsSVGUtils::GetStrokeWidth(mFrame) > 0) {
|
|
r.UnionEdges(nsSVGUtils::PathExtentsToMaxStrokeExtents(fill, mFrame,
|
|
gfxMatrix()));
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
SVGBBox
|
|
TextRenderedRun::GetFrameUserSpaceRect(nsPresContext* aContext,
|
|
uint32_t aFlags) const
|
|
{
|
|
SVGBBox r = GetRunUserSpaceRect(aContext, aFlags);
|
|
if (r.IsEmpty()) {
|
|
return r;
|
|
}
|
|
gfxMatrix m = GetTransformFromRunUserSpaceToFrameUserSpace(aContext);
|
|
return m.TransformBounds(r.ToThebesRect());
|
|
}
|
|
|
|
SVGBBox
|
|
TextRenderedRun::GetUserSpaceRect(nsPresContext* aContext,
|
|
uint32_t aFlags,
|
|
const gfxMatrix* aAdditionalTransform) const
|
|
{
|
|
SVGBBox r = GetRunUserSpaceRect(aContext, aFlags);
|
|
if (r.IsEmpty()) {
|
|
return r;
|
|
}
|
|
gfxMatrix m = GetTransformFromRunUserSpaceToUserSpace(aContext);
|
|
if (aAdditionalTransform) {
|
|
m *= *aAdditionalTransform;
|
|
}
|
|
return m.TransformBounds(r.ToThebesRect());
|
|
}
|
|
|
|
void
|
|
TextRenderedRun::GetClipEdges(nscoord& aVisIStartEdge,
|
|
nscoord& aVisIEndEdge) const
|
|
{
|
|
uint32_t contentLength = mFrame->GetContentLength();
|
|
if (mTextFrameContentOffset == 0 &&
|
|
mTextFrameContentLength == contentLength) {
|
|
// If the rendered run covers the entire content, we know we don't need
|
|
// to clip without having to measure anything.
|
|
aVisIStartEdge = 0;
|
|
aVisIEndEdge = 0;
|
|
return;
|
|
}
|
|
|
|
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
|
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
|
|
|
// Get the covered content offset/length for this rendered run in skipped
|
|
// characters, since that is what GetAdvanceWidth expects.
|
|
Range runRange = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
|
mTextFrameContentLength);
|
|
|
|
// Get the offset/length of the whole nsTextFrame.
|
|
uint32_t frameOffset = mFrame->GetContentOffset();
|
|
uint32_t frameLength = mFrame->GetContentLength();
|
|
|
|
// Trim the whole-nsTextFrame offset/length to remove any leading/trailing
|
|
// white space, as the nsTextFrame when painting does not include them when
|
|
// interpreting clip edges.
|
|
nsTextFrame::TrimmedOffsets trimmedOffsets =
|
|
mFrame->GetTrimmedOffsets(mFrame->GetContent()->GetText(), true);
|
|
TrimOffsets(frameOffset, frameLength, trimmedOffsets);
|
|
|
|
// Convert the trimmed whole-nsTextFrame offset/length into skipped
|
|
// characters.
|
|
Range frameRange = ConvertOriginalToSkipped(it, frameOffset, frameLength);
|
|
|
|
// Measure the advance width in the text run between the start of
|
|
// frame's content and the start of the rendered run's content,
|
|
nscoord startEdge = textRun->
|
|
GetAdvanceWidth(Range(frameRange.start, runRange.start), nullptr);
|
|
|
|
// and between the end of the rendered run's content and the end
|
|
// of the frame's content.
|
|
nscoord endEdge = textRun->
|
|
GetAdvanceWidth(Range(runRange.end, frameRange.end), nullptr);
|
|
|
|
if (textRun->IsRightToLeft()) {
|
|
aVisIStartEdge = endEdge;
|
|
aVisIEndEdge = startEdge;
|
|
} else {
|
|
aVisIStartEdge = startEdge;
|
|
aVisIEndEdge = endEdge;
|
|
}
|
|
}
|
|
|
|
nscoord
|
|
TextRenderedRun::GetAdvanceWidth() const
|
|
{
|
|
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
|
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
|
|
|
Range range = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
|
mTextFrameContentLength);
|
|
|
|
return textRun->GetAdvanceWidth(range, nullptr);
|
|
}
|
|
|
|
int32_t
|
|
TextRenderedRun::GetCharNumAtPosition(nsPresContext* aContext,
|
|
const gfxPoint& aPoint) const
|
|
{
|
|
if (mTextFrameContentLength == 0) {
|
|
return -1;
|
|
}
|
|
|
|
float cssPxPerDevPx = aContext->
|
|
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
|
|
|
// Convert the point from user space into run user space, and take
|
|
// into account any mFontSizeScaleFactor.
|
|
gfxMatrix m = GetTransformFromRunUserSpaceToUserSpace(aContext);
|
|
if (!m.Invert()) {
|
|
return -1;
|
|
}
|
|
gfxPoint p = m.TransformPoint(aPoint) / cssPxPerDevPx * mFontSizeScaleFactor;
|
|
|
|
// First check that the point lies vertically between the top and bottom
|
|
// edges of the text.
|
|
gfxFloat ascent, descent;
|
|
GetAscentAndDescentInAppUnits(mFrame, ascent, descent);
|
|
|
|
WritingMode writingMode = mFrame->GetWritingMode();
|
|
if (writingMode.IsVertical()) {
|
|
gfxFloat leftEdge =
|
|
mFrame->GetLogicalBaseline(writingMode) -
|
|
(writingMode.IsVerticalRL() ? ascent : descent);
|
|
gfxFloat rightEdge = leftEdge + ascent + descent;
|
|
if (p.x < aContext->AppUnitsToGfxUnits(leftEdge) ||
|
|
p.x > aContext->AppUnitsToGfxUnits(rightEdge)) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
gfxFloat topEdge = mFrame->GetLogicalBaseline(writingMode) - ascent;
|
|
gfxFloat bottomEdge = topEdge + ascent + descent;
|
|
if (p.y < aContext->AppUnitsToGfxUnits(topEdge) ||
|
|
p.y > aContext->AppUnitsToGfxUnits(bottomEdge)) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
|
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
|
|
|
// Next check that the point lies horizontally within the left and right
|
|
// edges of the text.
|
|
Range range = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
|
mTextFrameContentLength);
|
|
gfxFloat runAdvance =
|
|
aContext->AppUnitsToGfxUnits(textRun->GetAdvanceWidth(range, nullptr));
|
|
|
|
gfxFloat pos = writingMode.IsVertical() ? p.y : p.x;
|
|
if (pos < 0 || pos >= runAdvance) {
|
|
return -1;
|
|
}
|
|
|
|
// Finally, measure progressively smaller portions of the rendered run to
|
|
// find which glyph it lies within. This will need to change once we
|
|
// support letter-spacing and word-spacing.
|
|
bool rtl = textRun->IsRightToLeft();
|
|
for (int32_t i = mTextFrameContentLength - 1; i >= 0; i--) {
|
|
range = ConvertOriginalToSkipped(it, mTextFrameContentOffset, i);
|
|
gfxFloat advance =
|
|
aContext->AppUnitsToGfxUnits(textRun->GetAdvanceWidth(range, nullptr));
|
|
if ((rtl && pos < runAdvance - advance) ||
|
|
(!rtl && pos >= advance)) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// TextNodeIterator
|
|
|
|
enum SubtreePosition
|
|
{
|
|
eBeforeSubtree,
|
|
eWithinSubtree,
|
|
eAfterSubtree
|
|
};
|
|
|
|
/**
|
|
* An iterator class for nsTextNodes that are descendants of a given node, the
|
|
* root. Nodes are iterated in document order. An optional subtree can be
|
|
* specified, in which case the iterator will track whether the current state of
|
|
* the traversal over the tree is within that subtree or is past that subtree.
|
|
*/
|
|
class TextNodeIterator
|
|
{
|
|
public:
|
|
/**
|
|
* Constructs a TextNodeIterator with the specified root node and optional
|
|
* subtree.
|
|
*/
|
|
explicit TextNodeIterator(nsIContent* aRoot, nsIContent* aSubtree = nullptr)
|
|
: mRoot(aRoot),
|
|
mSubtree(aSubtree == aRoot ? nullptr : aSubtree),
|
|
mCurrent(aRoot),
|
|
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree)
|
|
{
|
|
NS_ASSERTION(aRoot, "expected non-null root");
|
|
if (!aRoot->IsNodeOfType(nsINode::eTEXT)) {
|
|
Next();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the current nsTextNode, or null if the iterator has finished.
|
|
*/
|
|
nsTextNode* Current() const
|
|
{
|
|
return static_cast<nsTextNode*>(mCurrent);
|
|
}
|
|
|
|
/**
|
|
* Advances to the next nsTextNode and returns it, or null if the end of
|
|
* iteration has been reached.
|
|
*/
|
|
nsTextNode* Next();
|
|
|
|
/**
|
|
* Returns whether the iterator is currently within the subtree rooted
|
|
* at mSubtree. Returns true if we are not tracking a subtree (we consider
|
|
* that we're always within the subtree).
|
|
*/
|
|
bool IsWithinSubtree() const
|
|
{
|
|
return mSubtreePosition == eWithinSubtree;
|
|
}
|
|
|
|
/**
|
|
* Returns whether the iterator is past the subtree rooted at mSubtree.
|
|
* Returns false if we are not tracking a subtree.
|
|
*/
|
|
bool IsAfterSubtree() const
|
|
{
|
|
return mSubtreePosition == eAfterSubtree;
|
|
}
|
|
|
|
private:
|
|
/**
|
|
* The root under which all nsTextNodes will be iterated over.
|
|
*/
|
|
nsIContent* mRoot;
|
|
|
|
/**
|
|
* The node rooting the subtree to track.
|
|
*/
|
|
nsIContent* mSubtree;
|
|
|
|
/**
|
|
* The current node during iteration.
|
|
*/
|
|
nsIContent* mCurrent;
|
|
|
|
/**
|
|
* The current iterator position relative to mSubtree.
|
|
*/
|
|
SubtreePosition mSubtreePosition;
|
|
};
|
|
|
|
nsTextNode*
|
|
TextNodeIterator::Next()
|
|
{
|
|
// Starting from mCurrent, we do a non-recursive traversal to the next
|
|
// nsTextNode beneath mRoot, updating mSubtreePosition appropriately if we
|
|
// encounter mSubtree.
|
|
if (mCurrent) {
|
|
do {
|
|
nsIContent* next = IsTextContentElement(mCurrent) ?
|
|
mCurrent->GetFirstChild() :
|
|
nullptr;
|
|
if (next) {
|
|
mCurrent = next;
|
|
if (mCurrent == mSubtree) {
|
|
mSubtreePosition = eWithinSubtree;
|
|
}
|
|
} else {
|
|
for (;;) {
|
|
if (mCurrent == mRoot) {
|
|
mCurrent = nullptr;
|
|
break;
|
|
}
|
|
if (mCurrent == mSubtree) {
|
|
mSubtreePosition = eAfterSubtree;
|
|
}
|
|
next = mCurrent->GetNextSibling();
|
|
if (next) {
|
|
mCurrent = next;
|
|
if (mCurrent == mSubtree) {
|
|
mSubtreePosition = eWithinSubtree;
|
|
}
|
|
break;
|
|
}
|
|
if (mCurrent == mSubtree) {
|
|
mSubtreePosition = eAfterSubtree;
|
|
}
|
|
mCurrent = mCurrent->GetParent();
|
|
}
|
|
}
|
|
} while (mCurrent && !mCurrent->IsNodeOfType(nsINode::eTEXT));
|
|
}
|
|
|
|
return static_cast<nsTextNode*>(mCurrent);
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// TextNodeCorrespondenceRecorder
|
|
|
|
/**
|
|
* TextNodeCorrespondence is used as the value of a frame property that
|
|
* is stored on all its descendant nsTextFrames. It stores the number of DOM
|
|
* characters between it and the previous nsTextFrame that did not have an
|
|
* nsTextFrame created for them, due to either not being in a correctly
|
|
* parented text content element, or because they were display:none.
|
|
* These are called "undisplayed characters".
|
|
*
|
|
* See also TextNodeCorrespondenceRecorder below, which is what sets the
|
|
* frame property.
|
|
*/
|
|
struct TextNodeCorrespondence
|
|
{
|
|
explicit TextNodeCorrespondence(uint32_t aUndisplayedCharacters)
|
|
: mUndisplayedCharacters(aUndisplayedCharacters)
|
|
{
|
|
}
|
|
|
|
uint32_t mUndisplayedCharacters;
|
|
};
|
|
|
|
NS_DECLARE_FRAME_PROPERTY_DELETABLE(TextNodeCorrespondenceProperty,
|
|
TextNodeCorrespondence)
|
|
|
|
/**
|
|
* Returns the number of undisplayed characters before the specified
|
|
* nsTextFrame.
|
|
*/
|
|
static uint32_t
|
|
GetUndisplayedCharactersBeforeFrame(nsTextFrame* aFrame)
|
|
{
|
|
void* value = aFrame->GetProperty(TextNodeCorrespondenceProperty());
|
|
TextNodeCorrespondence* correspondence =
|
|
static_cast<TextNodeCorrespondence*>(value);
|
|
if (!correspondence) {
|
|
NS_NOTREACHED("expected a TextNodeCorrespondenceProperty on nsTextFrame "
|
|
"used for SVG text");
|
|
return 0;
|
|
}
|
|
return correspondence->mUndisplayedCharacters;
|
|
}
|
|
|
|
/**
|
|
* Traverses the nsTextFrames for an SVGTextFrame and records a
|
|
* TextNodeCorrespondenceProperty on each for the number of undisplayed DOM
|
|
* characters between each frame. This is done by iterating simultaneously
|
|
* over the nsTextNodes and nsTextFrames and noting when nsTextNodes (or
|
|
* parts of them) are skipped when finding the next nsTextFrame.
|
|
*/
|
|
class TextNodeCorrespondenceRecorder
|
|
{
|
|
public:
|
|
/**
|
|
* Entry point for the TextNodeCorrespondenceProperty recording.
|
|
*/
|
|
static void RecordCorrespondence(SVGTextFrame* aRoot);
|
|
|
|
private:
|
|
explicit TextNodeCorrespondenceRecorder(SVGTextFrame* aRoot)
|
|
: mNodeIterator(aRoot->GetContent()),
|
|
mPreviousNode(nullptr),
|
|
mNodeCharIndex(0)
|
|
{
|
|
}
|
|
|
|
void Record(SVGTextFrame* aRoot);
|
|
void TraverseAndRecord(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Returns the next non-empty nsTextNode.
|
|
*/
|
|
nsTextNode* NextNode();
|
|
|
|
/**
|
|
* The iterator over the nsTextNodes that we use as we simultaneously
|
|
* iterate over the nsTextFrames.
|
|
*/
|
|
TextNodeIterator mNodeIterator;
|
|
|
|
/**
|
|
* The previous nsTextNode we iterated over.
|
|
*/
|
|
nsTextNode* mPreviousNode;
|
|
|
|
/**
|
|
* The index into the current nsTextNode's character content.
|
|
*/
|
|
uint32_t mNodeCharIndex;
|
|
};
|
|
|
|
/* static */ void
|
|
TextNodeCorrespondenceRecorder::RecordCorrespondence(SVGTextFrame* aRoot)
|
|
{
|
|
TextNodeCorrespondenceRecorder recorder(aRoot);
|
|
recorder.Record(aRoot);
|
|
}
|
|
|
|
void
|
|
TextNodeCorrespondenceRecorder::Record(SVGTextFrame* aRoot)
|
|
{
|
|
if (!mNodeIterator.Current()) {
|
|
// If there are no nsTextNodes then there is nothing to do.
|
|
return;
|
|
}
|
|
|
|
// Traverse over all the nsTextFrames and record the number of undisplayed
|
|
// characters.
|
|
TraverseAndRecord(aRoot);
|
|
|
|
// Find how many undisplayed characters there are after the final nsTextFrame.
|
|
uint32_t undisplayed = 0;
|
|
if (mNodeIterator.Current()) {
|
|
if (mPreviousNode && mPreviousNode->TextLength() != mNodeCharIndex) {
|
|
// The last nsTextFrame ended part way through an nsTextNode. The
|
|
// remaining characters count as undisplayed.
|
|
NS_ASSERTION(mNodeCharIndex < mPreviousNode->TextLength(),
|
|
"incorrect tracking of undisplayed characters in "
|
|
"text nodes");
|
|
undisplayed += mPreviousNode->TextLength() - mNodeCharIndex;
|
|
}
|
|
// All the remaining nsTextNodes that we iterate must also be undisplayed.
|
|
for (nsTextNode* textNode = mNodeIterator.Current();
|
|
textNode;
|
|
textNode = NextNode()) {
|
|
undisplayed += textNode->TextLength();
|
|
}
|
|
}
|
|
|
|
// Record the trailing number of undisplayed characters on the
|
|
// SVGTextFrame.
|
|
aRoot->mTrailingUndisplayedCharacters = undisplayed;
|
|
}
|
|
|
|
nsTextNode*
|
|
TextNodeCorrespondenceRecorder::NextNode()
|
|
{
|
|
mPreviousNode = mNodeIterator.Current();
|
|
nsTextNode* next;
|
|
do {
|
|
next = mNodeIterator.Next();
|
|
} while (next && next->TextLength() == 0);
|
|
return next;
|
|
}
|
|
|
|
void
|
|
TextNodeCorrespondenceRecorder::TraverseAndRecord(nsIFrame* aFrame)
|
|
{
|
|
// Recursively iterate over the frame tree, for frames that correspond
|
|
// to text content elements.
|
|
if (IsTextContentElement(aFrame->GetContent())) {
|
|
for (nsIFrame* f : aFrame->PrincipalChildList()) {
|
|
TraverseAndRecord(f);
|
|
}
|
|
return;
|
|
}
|
|
|
|
nsTextFrame* frame; // The current text frame.
|
|
nsTextNode* node; // The text node for the current text frame.
|
|
if (!GetNonEmptyTextFrameAndNode(aFrame, frame, node)) {
|
|
// If this isn't an nsTextFrame, or is empty, nothing to do.
|
|
return;
|
|
}
|
|
|
|
NS_ASSERTION(frame->GetContentOffset() >= 0,
|
|
"don't know how to handle negative content indexes");
|
|
|
|
uint32_t undisplayed = 0;
|
|
if (!mPreviousNode) {
|
|
// Must be the very first text frame.
|
|
NS_ASSERTION(mNodeCharIndex == 0, "incorrect tracking of undisplayed "
|
|
"characters in text nodes");
|
|
if (!mNodeIterator.Current()) {
|
|
NS_NOTREACHED("incorrect tracking of correspondence between text frames "
|
|
"and text nodes");
|
|
} else {
|
|
// Each whole nsTextNode we find before we get to the text node for the
|
|
// first text frame must be undisplayed.
|
|
while (mNodeIterator.Current() != node) {
|
|
undisplayed += mNodeIterator.Current()->TextLength();
|
|
NextNode();
|
|
}
|
|
// If the first text frame starts at a non-zero content offset, then those
|
|
// earlier characters are also undisplayed.
|
|
undisplayed += frame->GetContentOffset();
|
|
NextNode();
|
|
}
|
|
} else if (mPreviousNode == node) {
|
|
// Same text node as last time.
|
|
if (static_cast<uint32_t>(frame->GetContentOffset()) != mNodeCharIndex) {
|
|
// We have some characters in the middle of the text node
|
|
// that are undisplayed.
|
|
NS_ASSERTION(mNodeCharIndex <
|
|
static_cast<uint32_t>(frame->GetContentOffset()),
|
|
"incorrect tracking of undisplayed characters in "
|
|
"text nodes");
|
|
undisplayed = frame->GetContentOffset() - mNodeCharIndex;
|
|
}
|
|
} else {
|
|
// Different text node from last time.
|
|
if (mPreviousNode->TextLength() != mNodeCharIndex) {
|
|
NS_ASSERTION(mNodeCharIndex < mPreviousNode->TextLength(),
|
|
"incorrect tracking of undisplayed characters in "
|
|
"text nodes");
|
|
// Any trailing characters at the end of the previous nsTextNode are
|
|
// undisplayed.
|
|
undisplayed = mPreviousNode->TextLength() - mNodeCharIndex;
|
|
}
|
|
// Each whole nsTextNode we find before we get to the text node for
|
|
// the current text frame must be undisplayed.
|
|
while (mNodeIterator.Current() != node) {
|
|
undisplayed += mNodeIterator.Current()->TextLength();
|
|
NextNode();
|
|
}
|
|
// If the current text frame starts at a non-zero content offset, then those
|
|
// earlier characters are also undisplayed.
|
|
undisplayed += frame->GetContentOffset();
|
|
NextNode();
|
|
}
|
|
|
|
// Set the frame property.
|
|
frame->SetProperty(TextNodeCorrespondenceProperty(),
|
|
new TextNodeCorrespondence(undisplayed));
|
|
|
|
// Remember how far into the current nsTextNode we are.
|
|
mNodeCharIndex = frame->GetContentEnd();
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// TextFrameIterator
|
|
|
|
/**
|
|
* An iterator class for nsTextFrames that are descendants of an
|
|
* SVGTextFrame. The iterator can optionally track whether the
|
|
* current nsTextFrame is for a descendant of, or past, a given subtree
|
|
* content node or frame. (This functionality is used for example by the SVG
|
|
* DOM text methods to get only the nsTextFrames for a particular <tspan>.)
|
|
*
|
|
* TextFrameIterator also tracks and exposes other information about the
|
|
* current nsTextFrame:
|
|
*
|
|
* * how many undisplayed characters came just before it
|
|
* * its position (in app units) relative to the SVGTextFrame's anonymous
|
|
* block frame
|
|
* * what nsInlineFrame corresponding to a <textPath> element it is a
|
|
* descendant of
|
|
* * what computed dominant-baseline value applies to it
|
|
*
|
|
* Note that any text frames that are empty -- whose ContentLength() is 0 --
|
|
* will be skipped over.
|
|
*/
|
|
class TextFrameIterator
|
|
{
|
|
public:
|
|
/**
|
|
* Constructs a TextFrameIterator for the specified SVGTextFrame
|
|
* with an optional frame subtree to restrict iterated text frames to.
|
|
*/
|
|
explicit TextFrameIterator(SVGTextFrame* aRoot, nsIFrame* aSubtree = nullptr)
|
|
: mRootFrame(aRoot),
|
|
mSubtree(aSubtree),
|
|
mCurrentFrame(aRoot),
|
|
mCurrentPosition(),
|
|
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree)
|
|
{
|
|
Init();
|
|
}
|
|
|
|
/**
|
|
* Constructs a TextFrameIterator for the specified SVGTextFrame
|
|
* with an optional frame content subtree to restrict iterated text frames to.
|
|
*/
|
|
TextFrameIterator(SVGTextFrame* aRoot, nsIContent* aSubtree)
|
|
: mRootFrame(aRoot),
|
|
mSubtree(aRoot && aSubtree && aSubtree != aRoot->GetContent() ?
|
|
aSubtree->GetPrimaryFrame() :
|
|
nullptr),
|
|
mCurrentFrame(aRoot),
|
|
mCurrentPosition(),
|
|
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree)
|
|
{
|
|
Init();
|
|
}
|
|
|
|
/**
|
|
* Returns the root SVGTextFrame this TextFrameIterator is iterating over.
|
|
*/
|
|
SVGTextFrame* Root() const
|
|
{
|
|
return mRootFrame;
|
|
}
|
|
|
|
/**
|
|
* Returns the current nsTextFrame.
|
|
*/
|
|
nsTextFrame* Current() const
|
|
{
|
|
return do_QueryFrame(mCurrentFrame);
|
|
}
|
|
|
|
/**
|
|
* Returns the number of undisplayed characters in the DOM just before the
|
|
* current frame.
|
|
*/
|
|
uint32_t UndisplayedCharacters() const;
|
|
|
|
/**
|
|
* Returns the current frame's position, in app units, relative to the
|
|
* root SVGTextFrame's anonymous block frame.
|
|
*/
|
|
nsPoint Position() const
|
|
{
|
|
return mCurrentPosition;
|
|
}
|
|
|
|
/**
|
|
* Advances to the next nsTextFrame and returns it.
|
|
*/
|
|
nsTextFrame* Next();
|
|
|
|
/**
|
|
* Returns whether the iterator is within the subtree.
|
|
*/
|
|
bool IsWithinSubtree() const
|
|
{
|
|
return mSubtreePosition == eWithinSubtree;
|
|
}
|
|
|
|
/**
|
|
* Returns whether the iterator is past the subtree.
|
|
*/
|
|
bool IsAfterSubtree() const
|
|
{
|
|
return mSubtreePosition == eAfterSubtree;
|
|
}
|
|
|
|
/**
|
|
* Returns the frame corresponding to the <textPath> element, if we
|
|
* are inside one.
|
|
*/
|
|
nsIFrame* TextPathFrame() const
|
|
{
|
|
return mTextPathFrames.IsEmpty() ?
|
|
nullptr :
|
|
mTextPathFrames.ElementAt(mTextPathFrames.Length() - 1);
|
|
}
|
|
|
|
/**
|
|
* Returns the current frame's computed dominant-baseline value.
|
|
*/
|
|
uint8_t DominantBaseline() const
|
|
{
|
|
return mBaselines.ElementAt(mBaselines.Length() - 1);
|
|
}
|
|
|
|
/**
|
|
* Finishes the iterator.
|
|
*/
|
|
void Close()
|
|
{
|
|
mCurrentFrame = nullptr;
|
|
}
|
|
|
|
private:
|
|
/**
|
|
* Initializes the iterator and advances to the first item.
|
|
*/
|
|
void Init()
|
|
{
|
|
if (!mRootFrame) {
|
|
return;
|
|
}
|
|
|
|
mBaselines.AppendElement(mRootFrame->StyleSVGReset()->mDominantBaseline);
|
|
Next();
|
|
}
|
|
|
|
/**
|
|
* Pushes the specified frame's computed dominant-baseline value.
|
|
* If the value of the property is "auto", then the parent frame's
|
|
* computed value is used.
|
|
*/
|
|
void PushBaseline(nsIFrame* aNextFrame);
|
|
|
|
/**
|
|
* Pops the current dominant-baseline off the stack.
|
|
*/
|
|
void PopBaseline();
|
|
|
|
/**
|
|
* The root frame we are iterating through.
|
|
*/
|
|
SVGTextFrame* mRootFrame;
|
|
|
|
/**
|
|
* The frame for the subtree we are also interested in tracking.
|
|
*/
|
|
nsIFrame* mSubtree;
|
|
|
|
/**
|
|
* The current value of the iterator.
|
|
*/
|
|
nsIFrame* mCurrentFrame;
|
|
|
|
/**
|
|
* The position, in app units, of the current frame relative to mRootFrame.
|
|
*/
|
|
nsPoint mCurrentPosition;
|
|
|
|
/**
|
|
* Stack of frames corresponding to <textPath> elements that are in scope
|
|
* for the current frame.
|
|
*/
|
|
AutoTArray<nsIFrame*, 1> mTextPathFrames;
|
|
|
|
/**
|
|
* Stack of dominant-baseline values to record as we traverse through the
|
|
* frame tree.
|
|
*/
|
|
AutoTArray<uint8_t, 8> mBaselines;
|
|
|
|
/**
|
|
* The iterator's current position relative to mSubtree.
|
|
*/
|
|
SubtreePosition mSubtreePosition;
|
|
};
|
|
|
|
uint32_t
|
|
TextFrameIterator::UndisplayedCharacters() const
|
|
{
|
|
MOZ_ASSERT(!(mRootFrame->PrincipalChildList().FirstChild() &&
|
|
NS_SUBTREE_DIRTY(mRootFrame->PrincipalChildList().FirstChild())),
|
|
"should have already reflowed the anonymous block child");
|
|
|
|
if (!mCurrentFrame) {
|
|
return mRootFrame->mTrailingUndisplayedCharacters;
|
|
}
|
|
|
|
nsTextFrame* frame = do_QueryFrame(mCurrentFrame);
|
|
return GetUndisplayedCharactersBeforeFrame(frame);
|
|
}
|
|
|
|
nsTextFrame*
|
|
TextFrameIterator::Next()
|
|
{
|
|
// Starting from mCurrentFrame, we do a non-recursive traversal to the next
|
|
// nsTextFrame beneath mRoot, updating mSubtreePosition appropriately if we
|
|
// encounter mSubtree.
|
|
if (mCurrentFrame) {
|
|
do {
|
|
nsIFrame* next = IsTextContentElement(mCurrentFrame->GetContent()) ?
|
|
mCurrentFrame->PrincipalChildList().FirstChild() :
|
|
nullptr;
|
|
if (next) {
|
|
// Descend into this frame, and accumulate its position.
|
|
mCurrentPosition += next->GetPosition();
|
|
if (next->GetContent()->IsSVGElement(nsGkAtoms::textPath)) {
|
|
// Record this <textPath> frame.
|
|
mTextPathFrames.AppendElement(next);
|
|
}
|
|
// Record the frame's baseline.
|
|
PushBaseline(next);
|
|
mCurrentFrame = next;
|
|
if (mCurrentFrame == mSubtree) {
|
|
// If the current frame is mSubtree, we have now moved into it.
|
|
mSubtreePosition = eWithinSubtree;
|
|
}
|
|
} else {
|
|
for (;;) {
|
|
// We want to move past the current frame.
|
|
if (mCurrentFrame == mRootFrame) {
|
|
// If we've reached the root frame, we're finished.
|
|
mCurrentFrame = nullptr;
|
|
break;
|
|
}
|
|
// Remove the current frame's position.
|
|
mCurrentPosition -= mCurrentFrame->GetPosition();
|
|
if (mCurrentFrame->GetContent()->IsSVGElement(nsGkAtoms::textPath)) {
|
|
// Pop off the <textPath> frame if this is a <textPath>.
|
|
mTextPathFrames.TruncateLength(mTextPathFrames.Length() - 1);
|
|
}
|
|
// Pop off the current baseline.
|
|
PopBaseline();
|
|
if (mCurrentFrame == mSubtree) {
|
|
// If this was mSubtree, we have now moved past it.
|
|
mSubtreePosition = eAfterSubtree;
|
|
}
|
|
next = mCurrentFrame->GetNextSibling();
|
|
if (next) {
|
|
// Moving to the next sibling.
|
|
mCurrentPosition += next->GetPosition();
|
|
if (next->GetContent()->IsSVGElement(nsGkAtoms::textPath)) {
|
|
// Record this <textPath> frame.
|
|
mTextPathFrames.AppendElement(next);
|
|
}
|
|
// Record the frame's baseline.
|
|
PushBaseline(next);
|
|
mCurrentFrame = next;
|
|
if (mCurrentFrame == mSubtree) {
|
|
// If the current frame is mSubtree, we have now moved into it.
|
|
mSubtreePosition = eWithinSubtree;
|
|
}
|
|
break;
|
|
}
|
|
if (mCurrentFrame == mSubtree) {
|
|
// If there is no next sibling frame, and the current frame is
|
|
// mSubtree, we have now moved past it.
|
|
mSubtreePosition = eAfterSubtree;
|
|
}
|
|
// Ascend out of this frame.
|
|
mCurrentFrame = mCurrentFrame->GetParent();
|
|
}
|
|
}
|
|
} while (mCurrentFrame &&
|
|
!IsNonEmptyTextFrame(mCurrentFrame));
|
|
}
|
|
|
|
return Current();
|
|
}
|
|
|
|
void
|
|
TextFrameIterator::PushBaseline(nsIFrame* aNextFrame)
|
|
{
|
|
uint8_t baseline = aNextFrame->StyleSVGReset()->mDominantBaseline;
|
|
if (baseline == NS_STYLE_DOMINANT_BASELINE_AUTO) {
|
|
baseline = mBaselines.LastElement();
|
|
}
|
|
mBaselines.AppendElement(baseline);
|
|
}
|
|
|
|
void
|
|
TextFrameIterator::PopBaseline()
|
|
{
|
|
NS_ASSERTION(!mBaselines.IsEmpty(), "popped too many baselines");
|
|
mBaselines.TruncateLength(mBaselines.Length() - 1);
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// TextRenderedRunIterator
|
|
|
|
/**
|
|
* Iterator for TextRenderedRun objects for the SVGTextFrame.
|
|
*/
|
|
class TextRenderedRunIterator
|
|
{
|
|
public:
|
|
/**
|
|
* Values for the aFilter argument of the constructor, to indicate which frames
|
|
* we should be limited to iterating TextRenderedRun objects for.
|
|
*/
|
|
enum RenderedRunFilter {
|
|
// Iterate TextRenderedRuns for all nsTextFrames.
|
|
eAllFrames,
|
|
// Iterate only TextRenderedRuns for nsTextFrames that are
|
|
// visibility:visible.
|
|
eVisibleFrames
|
|
};
|
|
|
|
/**
|
|
* Constructs a TextRenderedRunIterator with an optional frame subtree to
|
|
* restrict iterated rendered runs to.
|
|
*
|
|
* @param aSVGTextFrame The SVGTextFrame whose rendered runs to iterate
|
|
* through.
|
|
* @param aFilter Indicates whether to iterate rendered runs for non-visible
|
|
* nsTextFrames.
|
|
* @param aSubtree An optional frame subtree to restrict iterated rendered
|
|
* runs to.
|
|
*/
|
|
explicit TextRenderedRunIterator(SVGTextFrame* aSVGTextFrame,
|
|
RenderedRunFilter aFilter = eAllFrames,
|
|
nsIFrame* aSubtree = nullptr)
|
|
: mFrameIterator(FrameIfAnonymousChildReflowed(aSVGTextFrame), aSubtree),
|
|
mFilter(aFilter),
|
|
mTextElementCharIndex(0),
|
|
mFrameStartTextElementCharIndex(0),
|
|
mFontSizeScaleFactor(aSVGTextFrame->mFontSizeScaleFactor),
|
|
mCurrent(First())
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Constructs a TextRenderedRunIterator with a content subtree to restrict
|
|
* iterated rendered runs to.
|
|
*
|
|
* @param aSVGTextFrame The SVGTextFrame whose rendered runs to iterate
|
|
* through.
|
|
* @param aFilter Indicates whether to iterate rendered runs for non-visible
|
|
* nsTextFrames.
|
|
* @param aSubtree A content subtree to restrict iterated rendered runs to.
|
|
*/
|
|
TextRenderedRunIterator(SVGTextFrame* aSVGTextFrame,
|
|
RenderedRunFilter aFilter,
|
|
nsIContent* aSubtree)
|
|
: mFrameIterator(FrameIfAnonymousChildReflowed(aSVGTextFrame), aSubtree),
|
|
mFilter(aFilter),
|
|
mTextElementCharIndex(0),
|
|
mFrameStartTextElementCharIndex(0),
|
|
mFontSizeScaleFactor(aSVGTextFrame->mFontSizeScaleFactor),
|
|
mCurrent(First())
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Returns the current TextRenderedRun.
|
|
*/
|
|
TextRenderedRun Current() const
|
|
{
|
|
return mCurrent;
|
|
}
|
|
|
|
/**
|
|
* Advances to the next TextRenderedRun and returns it.
|
|
*/
|
|
TextRenderedRun Next();
|
|
|
|
private:
|
|
/**
|
|
* Returns the root SVGTextFrame this iterator is for.
|
|
*/
|
|
SVGTextFrame* Root() const
|
|
{
|
|
return mFrameIterator.Root();
|
|
}
|
|
|
|
/**
|
|
* Advances to the first TextRenderedRun and returns it.
|
|
*/
|
|
TextRenderedRun First();
|
|
|
|
/**
|
|
* The frame iterator to use.
|
|
*/
|
|
TextFrameIterator mFrameIterator;
|
|
|
|
/**
|
|
* The filter indicating which TextRenderedRuns to return.
|
|
*/
|
|
RenderedRunFilter mFilter;
|
|
|
|
/**
|
|
* The character index across the entire <text> element we are currently
|
|
* up to.
|
|
*/
|
|
uint32_t mTextElementCharIndex;
|
|
|
|
/**
|
|
* The character index across the entire <text> for the start of the current
|
|
* frame.
|
|
*/
|
|
uint32_t mFrameStartTextElementCharIndex;
|
|
|
|
/**
|
|
* The font-size scale factor we used when constructing the nsTextFrames.
|
|
*/
|
|
double mFontSizeScaleFactor;
|
|
|
|
/**
|
|
* The current TextRenderedRun.
|
|
*/
|
|
TextRenderedRun mCurrent;
|
|
};
|
|
|
|
TextRenderedRun
|
|
TextRenderedRunIterator::Next()
|
|
{
|
|
if (!mFrameIterator.Current()) {
|
|
// If there are no more frames, then there are no more rendered runs to
|
|
// return.
|
|
mCurrent = TextRenderedRun();
|
|
return mCurrent;
|
|
}
|
|
|
|
// The values we will use to initialize the TextRenderedRun with.
|
|
nsTextFrame* frame;
|
|
gfxPoint pt;
|
|
double rotate;
|
|
nscoord baseline;
|
|
uint32_t offset, length;
|
|
uint32_t charIndex;
|
|
|
|
// We loop, because we want to skip over rendered runs that either aren't
|
|
// within our subtree of interest, because they don't match the filter,
|
|
// or because they are hidden due to having fallen off the end of a
|
|
// <textPath>.
|
|
for (;;) {
|
|
if (mFrameIterator.IsAfterSubtree()) {
|
|
mCurrent = TextRenderedRun();
|
|
return mCurrent;
|
|
}
|
|
|
|
frame = mFrameIterator.Current();
|
|
|
|
charIndex = mTextElementCharIndex;
|
|
|
|
// Find the end of the rendered run, by looking through the
|
|
// SVGTextFrame's positions array until we find one that is recorded
|
|
// as a run boundary.
|
|
uint32_t runStart, runEnd; // XXX Replace runStart with mTextElementCharIndex.
|
|
runStart = mTextElementCharIndex;
|
|
runEnd = runStart + 1;
|
|
while (runEnd < Root()->mPositions.Length() &&
|
|
!Root()->mPositions[runEnd].mRunBoundary) {
|
|
runEnd++;
|
|
}
|
|
|
|
// Convert the global run start/end indexes into an offset/length into the
|
|
// current frame's nsTextNode.
|
|
offset = frame->GetContentOffset() + runStart -
|
|
mFrameStartTextElementCharIndex;
|
|
length = runEnd - runStart;
|
|
|
|
// If the end of the frame's content comes before the run boundary we found
|
|
// in SVGTextFrame's position array, we need to shorten the rendered run.
|
|
uint32_t contentEnd = frame->GetContentEnd();
|
|
if (offset + length > contentEnd) {
|
|
length = contentEnd - offset;
|
|
}
|
|
|
|
NS_ASSERTION(offset >= uint32_t(frame->GetContentOffset()), "invalid offset");
|
|
NS_ASSERTION(offset + length <= contentEnd, "invalid offset or length");
|
|
|
|
// Get the frame's baseline position.
|
|
frame->EnsureTextRun(nsTextFrame::eInflated);
|
|
baseline = GetBaselinePosition(frame,
|
|
frame->GetTextRun(nsTextFrame::eInflated),
|
|
mFrameIterator.DominantBaseline(),
|
|
mFontSizeScaleFactor);
|
|
|
|
// Trim the offset/length to remove any leading/trailing white space.
|
|
uint32_t untrimmedOffset = offset;
|
|
uint32_t untrimmedLength = length;
|
|
nsTextFrame::TrimmedOffsets trimmedOffsets =
|
|
frame->GetTrimmedOffsets(frame->GetContent()->GetText(), true);
|
|
TrimOffsets(offset, length, trimmedOffsets);
|
|
charIndex += offset - untrimmedOffset;
|
|
|
|
// Get the position and rotation of the character that begins this
|
|
// rendered run.
|
|
pt = Root()->mPositions[charIndex].mPosition;
|
|
rotate = Root()->mPositions[charIndex].mAngle;
|
|
|
|
// Determine if we should skip this rendered run.
|
|
bool skip = !mFrameIterator.IsWithinSubtree() ||
|
|
Root()->mPositions[mTextElementCharIndex].mHidden;
|
|
if (mFilter == eVisibleFrames) {
|
|
skip = skip || !frame->StyleVisibility()->IsVisible();
|
|
}
|
|
|
|
// Update our global character index to move past the characters
|
|
// corresponding to this rendered run.
|
|
mTextElementCharIndex += untrimmedLength;
|
|
|
|
// If we have moved past the end of the current frame's content, we need to
|
|
// advance to the next frame.
|
|
if (offset + untrimmedLength >= contentEnd) {
|
|
mFrameIterator.Next();
|
|
mTextElementCharIndex += mFrameIterator.UndisplayedCharacters();
|
|
mFrameStartTextElementCharIndex = mTextElementCharIndex;
|
|
}
|
|
|
|
if (!mFrameIterator.Current()) {
|
|
if (skip) {
|
|
// That was the last frame, and we skipped this rendered run. So we
|
|
// have no rendered run to return.
|
|
mCurrent = TextRenderedRun();
|
|
return mCurrent;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (length && !skip) {
|
|
// Only return a rendered run if it didn't get collapsed away entirely
|
|
// (due to it being all white space) and if we don't want to skip it.
|
|
break;
|
|
}
|
|
}
|
|
|
|
mCurrent = TextRenderedRun(frame, pt, Root()->mLengthAdjustScaleFactor,
|
|
rotate, mFontSizeScaleFactor, baseline,
|
|
offset, length, charIndex);
|
|
return mCurrent;
|
|
}
|
|
|
|
TextRenderedRun
|
|
TextRenderedRunIterator::First()
|
|
{
|
|
if (!mFrameIterator.Current()) {
|
|
return TextRenderedRun();
|
|
}
|
|
|
|
if (Root()->mPositions.IsEmpty()) {
|
|
mFrameIterator.Close();
|
|
return TextRenderedRun();
|
|
}
|
|
|
|
// Get the character index for the start of this rendered run, by skipping
|
|
// any undisplayed characters.
|
|
mTextElementCharIndex = mFrameIterator.UndisplayedCharacters();
|
|
mFrameStartTextElementCharIndex = mTextElementCharIndex;
|
|
|
|
return Next();
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// CharIterator
|
|
|
|
/**
|
|
* Iterator for characters within an SVGTextFrame.
|
|
*/
|
|
class CharIterator
|
|
{
|
|
typedef gfxTextRun::Range Range;
|
|
|
|
public:
|
|
/**
|
|
* Values for the aFilter argument of the constructor, to indicate which
|
|
* characters we should be iterating over.
|
|
*/
|
|
enum CharacterFilter {
|
|
// Iterate over all original characters from the DOM that are within valid
|
|
// text content elements.
|
|
eOriginal,
|
|
// Iterate only over characters that are addressable by the positioning
|
|
// attributes x="", y="", etc. This includes all characters after
|
|
// collapsing white space as required by the value of 'white-space'.
|
|
eAddressable,
|
|
// Iterate only over characters that are the first of clusters or ligature
|
|
// groups.
|
|
eClusterAndLigatureGroupStart,
|
|
// Iterate only over characters that are part of a cluster or ligature
|
|
// group but not the first character.
|
|
eClusterOrLigatureGroupMiddle
|
|
};
|
|
|
|
/**
|
|
* Constructs a CharIterator.
|
|
*
|
|
* @param aSVGTextFrame The SVGTextFrame whose characters to iterate
|
|
* through.
|
|
* @param aFilter Indicates which characters to iterate over.
|
|
* @param aSubtree A content subtree to track whether the current character
|
|
* is within.
|
|
*/
|
|
CharIterator(SVGTextFrame* aSVGTextFrame,
|
|
CharacterFilter aFilter,
|
|
nsIContent* aSubtree = nullptr);
|
|
|
|
/**
|
|
* Returns whether the iterator is finished.
|
|
*/
|
|
bool AtEnd() const
|
|
{
|
|
return !mFrameIterator.Current();
|
|
}
|
|
|
|
/**
|
|
* Advances to the next matching character. Returns true if there was a
|
|
* character to advance to, and false otherwise.
|
|
*/
|
|
bool Next();
|
|
|
|
/**
|
|
* Advances ahead aCount matching characters. Returns true if there were
|
|
* enough characters to advance past, and false otherwise.
|
|
*/
|
|
bool Next(uint32_t aCount);
|
|
|
|
/**
|
|
* Advances ahead up to aCount matching characters.
|
|
*/
|
|
void NextWithinSubtree(uint32_t aCount);
|
|
|
|
/**
|
|
* Advances to the character with the specified index. The index is in the
|
|
* space of original characters (i.e., all DOM characters under the <text>
|
|
* that are within valid text content elements).
|
|
*/
|
|
bool AdvanceToCharacter(uint32_t aTextElementCharIndex);
|
|
|
|
/**
|
|
* Advances to the first matching character after the current nsTextFrame.
|
|
*/
|
|
bool AdvancePastCurrentFrame();
|
|
|
|
/**
|
|
* Advances to the first matching character after the frames within
|
|
* the current <textPath>.
|
|
*/
|
|
bool AdvancePastCurrentTextPathFrame();
|
|
|
|
/**
|
|
* Advances to the first matching character of the subtree. Returns true
|
|
* if we successfully advance to the subtree, or if we are already within
|
|
* the subtree. Returns false if we are past the subtree.
|
|
*/
|
|
bool AdvanceToSubtree();
|
|
|
|
/**
|
|
* Returns the nsTextFrame for the current character.
|
|
*/
|
|
nsTextFrame* TextFrame() const
|
|
{
|
|
return mFrameIterator.Current();
|
|
}
|
|
|
|
/**
|
|
* Returns whether the iterator is within the subtree.
|
|
*/
|
|
bool IsWithinSubtree() const
|
|
{
|
|
return mFrameIterator.IsWithinSubtree();
|
|
}
|
|
|
|
/**
|
|
* Returns whether the iterator is past the subtree.
|
|
*/
|
|
bool IsAfterSubtree() const
|
|
{
|
|
return mFrameIterator.IsAfterSubtree();
|
|
}
|
|
|
|
/**
|
|
* Returns whether the current character is a skipped character.
|
|
*/
|
|
bool IsOriginalCharSkipped() const
|
|
{
|
|
return mSkipCharsIterator.IsOriginalCharSkipped();
|
|
}
|
|
|
|
/**
|
|
* Returns whether the current character is the start of a cluster and
|
|
* ligature group.
|
|
*/
|
|
bool IsClusterAndLigatureGroupStart() const;
|
|
|
|
/**
|
|
* Returns whether the current character is trimmed away when painting,
|
|
* due to it being leading/trailing white space.
|
|
*/
|
|
bool IsOriginalCharTrimmed() const;
|
|
|
|
/**
|
|
* Returns whether the current character is unaddressable from the SVG glyph
|
|
* positioning attributes.
|
|
*/
|
|
bool IsOriginalCharUnaddressable() const
|
|
{
|
|
return IsOriginalCharSkipped() || IsOriginalCharTrimmed();
|
|
}
|
|
|
|
/**
|
|
* Returns the text run for the current character.
|
|
*/
|
|
gfxTextRun* TextRun() const
|
|
{
|
|
return mTextRun;
|
|
}
|
|
|
|
/**
|
|
* Returns the current character index.
|
|
*/
|
|
uint32_t TextElementCharIndex() const
|
|
{
|
|
return mTextElementCharIndex;
|
|
}
|
|
|
|
/**
|
|
* Returns the character index for the start of the cluster/ligature group it
|
|
* is part of.
|
|
*/
|
|
uint32_t GlyphStartTextElementCharIndex() const
|
|
{
|
|
return mGlyphStartTextElementCharIndex;
|
|
}
|
|
|
|
/**
|
|
* Returns the number of undisplayed characters between the beginning of
|
|
* the glyph and the current character.
|
|
*/
|
|
uint32_t GlyphUndisplayedCharacters() const
|
|
{
|
|
return mGlyphUndisplayedCharacters;
|
|
}
|
|
|
|
/**
|
|
* Gets the original character offsets within the nsTextNode for the
|
|
* cluster/ligature group the current character is a part of.
|
|
*
|
|
* @param aOriginalOffset The offset of the start of the cluster/ligature
|
|
* group (output).
|
|
* @param aOriginalLength The length of cluster/ligature group (output).
|
|
*/
|
|
void GetOriginalGlyphOffsets(uint32_t& aOriginalOffset,
|
|
uint32_t& aOriginalLength) const;
|
|
|
|
/**
|
|
* Gets the advance, in user units, of the glyph the current character is
|
|
* part of.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
*/
|
|
gfxFloat GetGlyphAdvance(nsPresContext* aContext) const;
|
|
|
|
/**
|
|
* Gets the advance, in user units, of the current character. If the
|
|
* character is a part of ligature, then the advance returned will be
|
|
* a fraction of the ligature glyph's advance.
|
|
*
|
|
* @param aContext The context to use for unit conversions.
|
|
*/
|
|
gfxFloat GetAdvance(nsPresContext* aContext) const;
|
|
|
|
/**
|
|
* Gets the specified partial advance of the glyph the current character is
|
|
* part of. The partial advance is measured from the first character
|
|
* corresponding to the glyph until the specified part length.
|
|
*
|
|
* The part length value does not include any undisplayed characters in the
|
|
* middle of the cluster/ligature group. For example, if you have:
|
|
*
|
|
* <text>f<tspan display="none">x</tspan>i</text>
|
|
*
|
|
* and the "f" and "i" are ligaturized, then calling GetGlyphPartialAdvance
|
|
* with aPartLength values will have the following results:
|
|
*
|
|
* 0 => 0
|
|
* 1 => adv("fi") / 2
|
|
* 2 => adv("fi")
|
|
*
|
|
* @param aPartLength The number of characters in the cluster/ligature group
|
|
* to measure.
|
|
* @param aContext The context to use for unit conversions.
|
|
*/
|
|
gfxFloat GetGlyphPartialAdvance(uint32_t aPartLength,
|
|
nsPresContext* aContext) const;
|
|
|
|
/**
|
|
* Returns the frame corresponding to the <textPath> that the current
|
|
* character is within.
|
|
*/
|
|
nsIFrame* TextPathFrame() const
|
|
{
|
|
return mFrameIterator.TextPathFrame();
|
|
}
|
|
|
|
private:
|
|
/**
|
|
* Advances to the next character without checking it against the filter.
|
|
* Returns true if there was a next character to advance to, or false
|
|
* otherwise.
|
|
*/
|
|
bool NextCharacter();
|
|
|
|
/**
|
|
* Returns whether the current character matches the filter.
|
|
*/
|
|
bool MatchesFilter() const;
|
|
|
|
/**
|
|
* If this is the start of a glyph, record it.
|
|
*/
|
|
void UpdateGlyphStartTextElementCharIndex() {
|
|
if (!IsOriginalCharSkipped() && IsClusterAndLigatureGroupStart()) {
|
|
mGlyphStartTextElementCharIndex = mTextElementCharIndex;
|
|
mGlyphUndisplayedCharacters = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The filter to use.
|
|
*/
|
|
CharacterFilter mFilter;
|
|
|
|
/**
|
|
* The iterator for text frames.
|
|
*/
|
|
TextFrameIterator mFrameIterator;
|
|
|
|
/**
|
|
* A gfxSkipCharsIterator for the text frame the current character is
|
|
* a part of.
|
|
*/
|
|
gfxSkipCharsIterator mSkipCharsIterator;
|
|
|
|
// Cache for information computed by IsOriginalCharTrimmed.
|
|
mutable nsTextFrame* mFrameForTrimCheck;
|
|
mutable uint32_t mTrimmedOffset;
|
|
mutable uint32_t mTrimmedLength;
|
|
|
|
/**
|
|
* The text run the current character is a part of.
|
|
*/
|
|
gfxTextRun* mTextRun;
|
|
|
|
/**
|
|
* The current character's index.
|
|
*/
|
|
uint32_t mTextElementCharIndex;
|
|
|
|
/**
|
|
* The index of the character that starts the cluster/ligature group the
|
|
* current character is a part of.
|
|
*/
|
|
uint32_t mGlyphStartTextElementCharIndex;
|
|
|
|
/**
|
|
* If we are iterating in mode eClusterOrLigatureGroupMiddle, then
|
|
* this tracks how many undisplayed characters were encountered
|
|
* between the start of this glyph (at mGlyphStartTextElementCharIndex)
|
|
* and the current character (at mTextElementCharIndex).
|
|
*/
|
|
uint32_t mGlyphUndisplayedCharacters;
|
|
|
|
/**
|
|
* The scale factor to apply to glyph advances returned by
|
|
* GetGlyphAdvance etc. to take into account textLength="".
|
|
*/
|
|
float mLengthAdjustScaleFactor;
|
|
};
|
|
|
|
CharIterator::CharIterator(SVGTextFrame* aSVGTextFrame,
|
|
CharIterator::CharacterFilter aFilter,
|
|
nsIContent* aSubtree)
|
|
: mFilter(aFilter),
|
|
mFrameIterator(FrameIfAnonymousChildReflowed(aSVGTextFrame), aSubtree),
|
|
mFrameForTrimCheck(nullptr),
|
|
mTrimmedOffset(0),
|
|
mTrimmedLength(0),
|
|
mTextElementCharIndex(0),
|
|
mGlyphStartTextElementCharIndex(0),
|
|
mLengthAdjustScaleFactor(aSVGTextFrame->mLengthAdjustScaleFactor)
|
|
{
|
|
if (!AtEnd()) {
|
|
mSkipCharsIterator = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
|
mTextRun = TextFrame()->GetTextRun(nsTextFrame::eInflated);
|
|
mTextElementCharIndex = mFrameIterator.UndisplayedCharacters();
|
|
UpdateGlyphStartTextElementCharIndex();
|
|
if (!MatchesFilter()) {
|
|
Next();
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
CharIterator::Next()
|
|
{
|
|
while (NextCharacter()) {
|
|
if (MatchesFilter()) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
CharIterator::Next(uint32_t aCount)
|
|
{
|
|
if (aCount == 0 && AtEnd()) {
|
|
return false;
|
|
}
|
|
while (aCount) {
|
|
if (!Next()) {
|
|
return false;
|
|
}
|
|
aCount--;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void
|
|
CharIterator::NextWithinSubtree(uint32_t aCount)
|
|
{
|
|
while (IsWithinSubtree() && aCount) {
|
|
--aCount;
|
|
if (!Next()) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
CharIterator::AdvanceToCharacter(uint32_t aTextElementCharIndex)
|
|
{
|
|
while (mTextElementCharIndex < aTextElementCharIndex) {
|
|
if (!Next()) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
CharIterator::AdvancePastCurrentFrame()
|
|
{
|
|
// XXX Can do this better than one character at a time if it matters.
|
|
nsTextFrame* currentFrame = TextFrame();
|
|
do {
|
|
if (!Next()) {
|
|
return false;
|
|
}
|
|
} while (TextFrame() == currentFrame);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
CharIterator::AdvancePastCurrentTextPathFrame()
|
|
{
|
|
nsIFrame* currentTextPathFrame = TextPathFrame();
|
|
NS_ASSERTION(currentTextPathFrame,
|
|
"expected AdvancePastCurrentTextPathFrame to be called only "
|
|
"within a text path frame");
|
|
do {
|
|
if (!AdvancePastCurrentFrame()) {
|
|
return false;
|
|
}
|
|
} while (TextPathFrame() == currentTextPathFrame);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
CharIterator::AdvanceToSubtree()
|
|
{
|
|
while (!IsWithinSubtree()) {
|
|
if (IsAfterSubtree()) {
|
|
return false;
|
|
}
|
|
if (!AdvancePastCurrentFrame()) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
CharIterator::IsClusterAndLigatureGroupStart() const
|
|
{
|
|
return mTextRun->IsLigatureGroupStart(mSkipCharsIterator.GetSkippedOffset()) &&
|
|
mTextRun->IsClusterStart(mSkipCharsIterator.GetSkippedOffset());
|
|
}
|
|
|
|
bool
|
|
CharIterator::IsOriginalCharTrimmed() const
|
|
{
|
|
if (mFrameForTrimCheck != TextFrame()) {
|
|
// Since we do a lot of trim checking, we cache the trimmed offsets and
|
|
// lengths while we are in the same frame.
|
|
mFrameForTrimCheck = TextFrame();
|
|
uint32_t offset = mFrameForTrimCheck->GetContentOffset();
|
|
uint32_t length = mFrameForTrimCheck->GetContentLength();
|
|
nsIContent* content = mFrameForTrimCheck->GetContent();
|
|
nsTextFrame::TrimmedOffsets trim =
|
|
mFrameForTrimCheck->GetTrimmedOffsets(content->GetText(), true);
|
|
TrimOffsets(offset, length, trim);
|
|
mTrimmedOffset = offset;
|
|
mTrimmedLength = length;
|
|
}
|
|
|
|
// A character is trimmed if it is outside the mTrimmedOffset/mTrimmedLength
|
|
// range and it is not a significant newline character.
|
|
uint32_t index = mSkipCharsIterator.GetOriginalOffset();
|
|
return !((index >= mTrimmedOffset &&
|
|
index < mTrimmedOffset + mTrimmedLength) ||
|
|
(index >= mTrimmedOffset + mTrimmedLength &&
|
|
mFrameForTrimCheck->StyleText()->
|
|
NewlineIsSignificant(mFrameForTrimCheck) &&
|
|
mFrameForTrimCheck->GetContent()->GetText()->CharAt(index) == '\n'));
|
|
}
|
|
|
|
void
|
|
CharIterator::GetOriginalGlyphOffsets(uint32_t& aOriginalOffset,
|
|
uint32_t& aOriginalLength) const
|
|
{
|
|
gfxSkipCharsIterator it = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
|
it.SetOriginalOffset(mSkipCharsIterator.GetOriginalOffset() -
|
|
(mTextElementCharIndex -
|
|
mGlyphStartTextElementCharIndex -
|
|
mGlyphUndisplayedCharacters));
|
|
|
|
while (it.GetSkippedOffset() > 0 &&
|
|
(!mTextRun->IsClusterStart(it.GetSkippedOffset()) ||
|
|
!mTextRun->IsLigatureGroupStart(it.GetSkippedOffset()))) {
|
|
it.AdvanceSkipped(-1);
|
|
}
|
|
|
|
aOriginalOffset = it.GetOriginalOffset();
|
|
|
|
// Find the end of the cluster/ligature group.
|
|
it.SetOriginalOffset(mSkipCharsIterator.GetOriginalOffset());
|
|
do {
|
|
it.AdvanceSkipped(1);
|
|
} while (it.GetSkippedOffset() < mTextRun->GetLength() &&
|
|
(!mTextRun->IsClusterStart(it.GetSkippedOffset()) ||
|
|
!mTextRun->IsLigatureGroupStart(it.GetSkippedOffset())));
|
|
|
|
aOriginalLength = it.GetOriginalOffset() - aOriginalOffset;
|
|
}
|
|
|
|
gfxFloat
|
|
CharIterator::GetGlyphAdvance(nsPresContext* aContext) const
|
|
{
|
|
uint32_t offset, length;
|
|
GetOriginalGlyphOffsets(offset, length);
|
|
|
|
gfxSkipCharsIterator it = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
|
Range range = ConvertOriginalToSkipped(it, offset, length);
|
|
|
|
float cssPxPerDevPx = aContext->
|
|
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
|
|
|
gfxFloat advance = mTextRun->GetAdvanceWidth(range, nullptr);
|
|
return aContext->AppUnitsToGfxUnits(advance) *
|
|
mLengthAdjustScaleFactor * cssPxPerDevPx;
|
|
}
|
|
|
|
gfxFloat
|
|
CharIterator::GetAdvance(nsPresContext* aContext) const
|
|
{
|
|
float cssPxPerDevPx = aContext->
|
|
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
|
|
|
uint32_t offset = mSkipCharsIterator.GetSkippedOffset();
|
|
gfxFloat advance = mTextRun->
|
|
GetAdvanceWidth(Range(offset, offset + 1), nullptr);
|
|
return aContext->AppUnitsToGfxUnits(advance) *
|
|
mLengthAdjustScaleFactor * cssPxPerDevPx;
|
|
}
|
|
|
|
gfxFloat
|
|
CharIterator::GetGlyphPartialAdvance(uint32_t aPartLength,
|
|
nsPresContext* aContext) const
|
|
{
|
|
uint32_t offset, length;
|
|
GetOriginalGlyphOffsets(offset, length);
|
|
|
|
NS_ASSERTION(aPartLength <= length, "invalid aPartLength value");
|
|
length = aPartLength;
|
|
|
|
gfxSkipCharsIterator it = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
|
Range range = ConvertOriginalToSkipped(it, offset, length);
|
|
|
|
float cssPxPerDevPx = aContext->
|
|
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
|
|
|
gfxFloat advance = mTextRun->GetAdvanceWidth(range, nullptr);
|
|
return aContext->AppUnitsToGfxUnits(advance) *
|
|
mLengthAdjustScaleFactor * cssPxPerDevPx;
|
|
}
|
|
|
|
bool
|
|
CharIterator::NextCharacter()
|
|
{
|
|
if (AtEnd()) {
|
|
return false;
|
|
}
|
|
|
|
mTextElementCharIndex++;
|
|
|
|
// Advance within the current text run.
|
|
mSkipCharsIterator.AdvanceOriginal(1);
|
|
if (mSkipCharsIterator.GetOriginalOffset() < TextFrame()->GetContentEnd()) {
|
|
// We're still within the part of the text run for the current text frame.
|
|
UpdateGlyphStartTextElementCharIndex();
|
|
return true;
|
|
}
|
|
|
|
// Advance to the next frame.
|
|
mFrameIterator.Next();
|
|
|
|
// Skip any undisplayed characters.
|
|
uint32_t undisplayed = mFrameIterator.UndisplayedCharacters();
|
|
mGlyphUndisplayedCharacters += undisplayed;
|
|
mTextElementCharIndex += undisplayed;
|
|
if (!TextFrame()) {
|
|
// We're at the end.
|
|
mSkipCharsIterator = gfxSkipCharsIterator();
|
|
return false;
|
|
}
|
|
|
|
mSkipCharsIterator = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
|
mTextRun = TextFrame()->GetTextRun(nsTextFrame::eInflated);
|
|
UpdateGlyphStartTextElementCharIndex();
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
CharIterator::MatchesFilter() const
|
|
{
|
|
if (mFilter == eOriginal) {
|
|
return true;
|
|
}
|
|
|
|
if (IsOriginalCharSkipped()) {
|
|
return false;
|
|
}
|
|
|
|
if (mFilter == eAddressable) {
|
|
return !IsOriginalCharUnaddressable();
|
|
}
|
|
|
|
return (mFilter == eClusterAndLigatureGroupStart) ==
|
|
IsClusterAndLigatureGroupStart();
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// nsCharClipDisplayItem
|
|
|
|
/**
|
|
* An nsCharClipDisplayItem that obtains its left and right clip edges from a
|
|
* TextRenderedRun object.
|
|
*/
|
|
class SVGCharClipDisplayItem : public nsCharClipDisplayItem {
|
|
public:
|
|
explicit SVGCharClipDisplayItem(const TextRenderedRun& aRun)
|
|
: nsCharClipDisplayItem(aRun.mFrame)
|
|
{
|
|
aRun.GetClipEdges(mVisIStartEdge, mVisIEndEdge);
|
|
}
|
|
|
|
NS_DISPLAY_DECL_NAME("SVGText", TYPE_TEXT)
|
|
};
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// SVGTextDrawPathCallbacks
|
|
|
|
/**
|
|
* Text frame draw callback class that paints the text and text decoration parts
|
|
* of an nsTextFrame using SVG painting properties, and selection backgrounds
|
|
* and decorations as they would normally.
|
|
*
|
|
* An instance of this class is passed to nsTextFrame::PaintText if painting
|
|
* cannot be done directly (e.g. if we are using an SVG pattern fill, stroking
|
|
* the text, etc.).
|
|
*/
|
|
class SVGTextDrawPathCallbacks : public nsTextFrame::DrawPathCallbacks
|
|
{
|
|
typedef mozilla::image::imgDrawingParams imgDrawingParams;
|
|
|
|
public:
|
|
/**
|
|
* Constructs an SVGTextDrawPathCallbacks.
|
|
*
|
|
* @param aSVGTextFrame The ancestor text frame.
|
|
* @param aContext The context to use for painting.
|
|
* @param aFrame The nsTextFrame to paint.
|
|
* @param aCanvasTM The transformation matrix to set when painting; this
|
|
* should be the FOR_OUTERSVG_TM canvas TM of the text, so that
|
|
* paint servers are painted correctly.
|
|
* @param aShouldPaintSVGGlyphs Whether SVG glyphs should be painted.
|
|
*/
|
|
SVGTextDrawPathCallbacks(SVGTextFrame* aSVGTextFrame,
|
|
gfxContext& aContext,
|
|
nsTextFrame* aFrame,
|
|
const gfxMatrix& aCanvasTM,
|
|
bool aShouldPaintSVGGlyphs)
|
|
: DrawPathCallbacks(aShouldPaintSVGGlyphs),
|
|
mSVGTextFrame(aSVGTextFrame),
|
|
mContext(aContext),
|
|
mFrame(aFrame),
|
|
mCanvasTM(aCanvasTM)
|
|
{
|
|
}
|
|
|
|
void NotifySelectionBackgroundNeedsFill(const Rect& aBackgroundRect,
|
|
nscolor aColor,
|
|
DrawTarget& aDrawTarget) override;
|
|
void PaintDecorationLine(Rect aPath, nscolor aColor) override;
|
|
void PaintSelectionDecorationLine(Rect aPath, nscolor aColor) override;
|
|
void NotifyBeforeText(nscolor aColor) override;
|
|
void NotifyGlyphPathEmitted() override;
|
|
void NotifyAfterText() override;
|
|
|
|
private:
|
|
void SetupContext();
|
|
|
|
bool IsClipPathChild() const {
|
|
return mSVGTextFrame->HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD);
|
|
}
|
|
|
|
/**
|
|
* Paints a piece of text geometry. This is called when glyphs
|
|
* or text decorations have been emitted to the gfxContext.
|
|
*/
|
|
void HandleTextGeometry();
|
|
|
|
/**
|
|
* Sets the gfxContext paint to the appropriate color or pattern
|
|
* for filling text geometry.
|
|
*/
|
|
void MakeFillPattern(GeneralPattern* aOutPattern,
|
|
imgDrawingParams& aImgParams);
|
|
|
|
/**
|
|
* Fills and strokes a piece of text geometry, using group opacity
|
|
* if the selection style requires it.
|
|
*/
|
|
void FillAndStrokeGeometry();
|
|
|
|
/**
|
|
* Fills a piece of text geometry.
|
|
*/
|
|
void FillGeometry();
|
|
|
|
/**
|
|
* Strokes a piece of text geometry.
|
|
*/
|
|
void StrokeGeometry();
|
|
|
|
SVGTextFrame* mSVGTextFrame;
|
|
gfxContext& mContext;
|
|
nsTextFrame* mFrame;
|
|
const gfxMatrix& mCanvasTM;
|
|
|
|
/**
|
|
* The color that we were last told from one of the path callback functions.
|
|
* This color can be the special NS_SAME_AS_FOREGROUND_COLOR,
|
|
* NS_40PERCENT_FOREGROUND_COLOR and NS_TRANSPARENT colors when we are
|
|
* painting selections or IME decorations.
|
|
*/
|
|
nscolor mColor;
|
|
};
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::NotifySelectionBackgroundNeedsFill(
|
|
const Rect& aBackgroundRect,
|
|
nscolor aColor,
|
|
DrawTarget& aDrawTarget)
|
|
{
|
|
if (IsClipPathChild()) {
|
|
// Don't paint selection backgrounds when in a clip path.
|
|
return;
|
|
}
|
|
|
|
mColor = aColor; // currently needed by MakeFillPattern
|
|
|
|
GeneralPattern fillPattern;
|
|
// XXX cku Bug 1362417 we should pass imgDrawingParams from nsTextFrame.
|
|
imgDrawingParams imgParams;
|
|
MakeFillPattern(&fillPattern, imgParams);
|
|
if (fillPattern.GetPattern()) {
|
|
DrawOptions drawOptions(aColor == NS_40PERCENT_FOREGROUND_COLOR ? 0.4 : 1.0);
|
|
aDrawTarget.FillRect(aBackgroundRect, fillPattern, drawOptions);
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::NotifyBeforeText(nscolor aColor)
|
|
{
|
|
mColor = aColor;
|
|
SetupContext();
|
|
mContext.NewPath();
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::NotifyGlyphPathEmitted()
|
|
{
|
|
HandleTextGeometry();
|
|
mContext.NewPath();
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::NotifyAfterText()
|
|
{
|
|
mContext.Restore();
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::PaintDecorationLine(Rect aPath, nscolor aColor)
|
|
{
|
|
mColor = aColor;
|
|
AntialiasMode aaMode =
|
|
nsSVGUtils::ToAntialiasMode(mFrame->StyleText()->mTextRendering);
|
|
|
|
mContext.Save();
|
|
mContext.NewPath();
|
|
mContext.SetAntialiasMode(aaMode);
|
|
mContext.Rectangle(ThebesRect(aPath));
|
|
HandleTextGeometry();
|
|
mContext.NewPath();
|
|
mContext.Restore();
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::PaintSelectionDecorationLine(Rect aPath,
|
|
nscolor aColor)
|
|
{
|
|
if (IsClipPathChild()) {
|
|
// Don't paint selection decorations when in a clip path.
|
|
return;
|
|
}
|
|
|
|
mColor = aColor;
|
|
|
|
mContext.Save();
|
|
mContext.NewPath();
|
|
mContext.Rectangle(ThebesRect(aPath));
|
|
FillAndStrokeGeometry();
|
|
mContext.Restore();
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::SetupContext()
|
|
{
|
|
mContext.Save();
|
|
|
|
// XXX This is copied from nsSVGGlyphFrame::Render, but cairo doesn't actually
|
|
// seem to do anything with the antialias mode. So we can perhaps remove it,
|
|
// or make SetAntialiasMode set cairo text antialiasing too.
|
|
switch (mFrame->StyleText()->mTextRendering) {
|
|
case NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED:
|
|
mContext.SetAntialiasMode(AntialiasMode::NONE);
|
|
break;
|
|
default:
|
|
mContext.SetAntialiasMode(AntialiasMode::SUBPIXEL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::HandleTextGeometry()
|
|
{
|
|
if (IsClipPathChild()) {
|
|
RefPtr<Path> path = mContext.GetPath();
|
|
ColorPattern white(Color(1.f, 1.f, 1.f, 1.f)); // for masking, so no ToDeviceColor
|
|
mContext.GetDrawTarget()->Fill(path, white);
|
|
} else {
|
|
// Normal painting.
|
|
gfxContextMatrixAutoSaveRestore saveMatrix(&mContext);
|
|
mContext.SetMatrix(mCanvasTM);
|
|
|
|
FillAndStrokeGeometry();
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::MakeFillPattern(GeneralPattern* aOutPattern,
|
|
imgDrawingParams& aImgParams)
|
|
{
|
|
if (mColor == NS_SAME_AS_FOREGROUND_COLOR ||
|
|
mColor == NS_40PERCENT_FOREGROUND_COLOR) {
|
|
nsSVGUtils::MakeFillPatternFor(mFrame, &mContext, aOutPattern, aImgParams);
|
|
return;
|
|
}
|
|
|
|
if (mColor == NS_TRANSPARENT) {
|
|
return;
|
|
}
|
|
|
|
aOutPattern->InitColorPattern(ToDeviceColor(mColor));
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::FillAndStrokeGeometry()
|
|
{
|
|
bool pushedGroup = false;
|
|
if (mColor == NS_40PERCENT_FOREGROUND_COLOR) {
|
|
pushedGroup = true;
|
|
mContext.PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, 0.4f);
|
|
}
|
|
|
|
uint32_t paintOrder = mFrame->StyleSVG()->mPaintOrder;
|
|
if (paintOrder == NS_STYLE_PAINT_ORDER_NORMAL) {
|
|
FillGeometry();
|
|
StrokeGeometry();
|
|
} else {
|
|
while (paintOrder) {
|
|
uint32_t component =
|
|
paintOrder & ((1 << NS_STYLE_PAINT_ORDER_BITWIDTH) - 1);
|
|
switch (component) {
|
|
case NS_STYLE_PAINT_ORDER_FILL:
|
|
FillGeometry();
|
|
break;
|
|
case NS_STYLE_PAINT_ORDER_STROKE:
|
|
StrokeGeometry();
|
|
break;
|
|
}
|
|
paintOrder >>= NS_STYLE_PAINT_ORDER_BITWIDTH;
|
|
}
|
|
}
|
|
|
|
if (pushedGroup) {
|
|
mContext.PopGroupAndBlend();
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::FillGeometry()
|
|
{
|
|
GeneralPattern fillPattern;
|
|
// XXX cku Bug 1362417 we should pass imgDrawingParams from nsTextFrame.
|
|
imgDrawingParams imgParams;
|
|
MakeFillPattern(&fillPattern, imgParams);
|
|
if (fillPattern.GetPattern()) {
|
|
RefPtr<Path> path = mContext.GetPath();
|
|
FillRule fillRule = nsSVGUtils::ToFillRule(IsClipPathChild() ?
|
|
mFrame->StyleSVG()->mClipRule :
|
|
mFrame->StyleSVG()->mFillRule);
|
|
if (fillRule != path->GetFillRule()) {
|
|
RefPtr<PathBuilder> builder = path->CopyToBuilder(fillRule);
|
|
path = builder->Finish();
|
|
}
|
|
mContext.GetDrawTarget()->Fill(path, fillPattern);
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextDrawPathCallbacks::StrokeGeometry()
|
|
{
|
|
// We don't paint the stroke when we are filling with a selection color.
|
|
if (mColor == NS_SAME_AS_FOREGROUND_COLOR ||
|
|
mColor == NS_40PERCENT_FOREGROUND_COLOR) {
|
|
if (nsSVGUtils::HasStroke(mFrame, /*aContextPaint*/ nullptr)) {
|
|
GeneralPattern strokePattern;
|
|
// XXX cku Bug 1362417 we should pass imgDrawingParams from nsTextFrame.
|
|
imgDrawingParams imgParams;
|
|
nsSVGUtils::MakeStrokePatternFor(mFrame, &mContext, &strokePattern,
|
|
imgParams, /*aContextPaint*/ nullptr);
|
|
if (strokePattern.GetPattern()) {
|
|
if (!mFrame->GetParent()->GetContent()->IsSVGElement()) {
|
|
// The cast that follows would be unsafe
|
|
MOZ_ASSERT(false, "Our nsTextFrame's parent's content should be SVG");
|
|
return;
|
|
}
|
|
nsSVGElement* svgOwner =
|
|
static_cast<nsSVGElement*>(mFrame->GetParent()->GetContent());
|
|
|
|
// Apply any stroke-specific transform
|
|
gfxMatrix outerSVGToUser;
|
|
if (nsSVGUtils::GetNonScalingStrokeTransform(mFrame, &outerSVGToUser) &&
|
|
outerSVGToUser.Invert()) {
|
|
mContext.Multiply(outerSVGToUser);
|
|
}
|
|
|
|
RefPtr<Path> path = mContext.GetPath();
|
|
SVGContentUtils::AutoStrokeOptions strokeOptions;
|
|
SVGContentUtils::GetStrokeOptions(&strokeOptions, svgOwner,
|
|
mFrame->StyleContext(),
|
|
/*aContextPaint*/ nullptr);
|
|
DrawOptions drawOptions;
|
|
drawOptions.mAntialiasMode =
|
|
nsSVGUtils::ToAntialiasMode(mFrame->StyleText()->mTextRendering);
|
|
mContext.GetDrawTarget()->Stroke(path, strokePattern, strokeOptions);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace mozilla
|
|
|
|
|
|
// ============================================================================
|
|
// SVGTextFrame
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// Display list item
|
|
|
|
class nsDisplaySVGText : public nsDisplayItem {
|
|
public:
|
|
nsDisplaySVGText(nsDisplayListBuilder* aBuilder,
|
|
SVGTextFrame* aFrame)
|
|
: nsDisplayItem(aBuilder, aFrame),
|
|
mDisableSubpixelAA(false)
|
|
{
|
|
MOZ_COUNT_CTOR(nsDisplaySVGText);
|
|
MOZ_ASSERT(aFrame, "Must have a frame!");
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplaySVGText() {
|
|
MOZ_COUNT_DTOR(nsDisplaySVGText);
|
|
}
|
|
#endif
|
|
|
|
NS_DISPLAY_DECL_NAME("nsDisplaySVGText", TYPE_SVG_TEXT)
|
|
|
|
virtual void DisableComponentAlpha() override {
|
|
mDisableSubpixelAA = true;
|
|
}
|
|
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState,
|
|
nsTArray<nsIFrame*> *aOutFrames) override;
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder,
|
|
gfxContext* aCtx) override;
|
|
nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
|
|
{
|
|
return new nsDisplayItemGenericImageGeometry(this, aBuilder);
|
|
}
|
|
virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) override {
|
|
bool snap;
|
|
return GetBounds(aBuilder, &snap);
|
|
}
|
|
private:
|
|
bool mDisableSubpixelAA;
|
|
};
|
|
|
|
void
|
|
nsDisplaySVGText::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
|
|
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
|
|
{
|
|
SVGTextFrame *frame = static_cast<SVGTextFrame*>(mFrame);
|
|
nsPoint pointRelativeToReferenceFrame = aRect.Center();
|
|
// ToReferenceFrame() includes frame->GetPosition(), our user space position.
|
|
nsPoint userSpacePtInAppUnits = pointRelativeToReferenceFrame -
|
|
(ToReferenceFrame() - frame->GetPosition());
|
|
|
|
gfxPoint userSpacePt =
|
|
gfxPoint(userSpacePtInAppUnits.x, userSpacePtInAppUnits.y) /
|
|
frame->PresContext()->AppUnitsPerCSSPixel();
|
|
|
|
nsIFrame* target = frame->GetFrameForPoint(userSpacePt);
|
|
if (target) {
|
|
aOutFrames->AppendElement(target);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsDisplaySVGText::Paint(nsDisplayListBuilder* aBuilder,
|
|
gfxContext* aCtx)
|
|
{
|
|
DrawTargetAutoDisableSubpixelAntialiasing
|
|
disable(aCtx->GetDrawTarget(), mDisableSubpixelAA);
|
|
|
|
uint32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
|
|
|
|
// ToReferenceFrame includes our mRect offset, but painting takes
|
|
// account of that too. To avoid double counting, we subtract that
|
|
// here.
|
|
nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
|
|
|
|
gfxPoint devPixelOffset =
|
|
nsLayoutUtils::PointToGfxPoint(offset, appUnitsPerDevPixel);
|
|
|
|
gfxMatrix tm = nsSVGUtils::GetCSSPxToDevPxMatrix(mFrame) *
|
|
gfxMatrix::Translation(devPixelOffset);
|
|
|
|
gfxContext* ctx = aCtx;
|
|
imgDrawingParams imgParams(aBuilder->ShouldSyncDecodeImages()
|
|
? imgIContainer::FLAG_SYNC_DECODE
|
|
: imgIContainer::FLAG_SYNC_DECODE_IF_FAST);
|
|
static_cast<SVGTextFrame*>(mFrame)->PaintSVG(*ctx, tm, imgParams);
|
|
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, imgParams.result);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
// nsQueryFrame methods
|
|
|
|
NS_QUERYFRAME_HEAD(SVGTextFrame)
|
|
NS_QUERYFRAME_ENTRY(SVGTextFrame)
|
|
NS_QUERYFRAME_TAIL_INHERITING(nsSVGDisplayContainerFrame)
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Implementation
|
|
|
|
nsIFrame*
|
|
NS_NewSVGTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
|
|
{
|
|
return new (aPresShell) SVGTextFrame(aContext);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(SVGTextFrame)
|
|
|
|
// ---------------------------------------------------------------------
|
|
// nsIFrame methods
|
|
|
|
void
|
|
SVGTextFrame::Init(nsIContent* aContent,
|
|
nsContainerFrame* aParent,
|
|
nsIFrame* aPrevInFlow)
|
|
{
|
|
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::text), "Content is not an SVG text");
|
|
|
|
nsSVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
|
|
AddStateBits((aParent->GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD) |
|
|
NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_SVG_TEXT);
|
|
|
|
mMutationObserver = new MutationObserver(this);
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
if (NS_SUBTREE_DIRTY(this)) {
|
|
// We can sometimes be asked to paint before reflow happens and we
|
|
// have updated mPositions, etc. In this case, we just avoid
|
|
// painting.
|
|
return;
|
|
}
|
|
if (!IsVisibleForPainting(aBuilder) &&
|
|
aBuilder->IsForPainting()) {
|
|
return;
|
|
}
|
|
DisplayOutline(aBuilder, aLists);
|
|
aLists.Content()->AppendNewToTop(
|
|
new (aBuilder) nsDisplaySVGText(aBuilder, this));
|
|
}
|
|
|
|
nsresult
|
|
SVGTextFrame::AttributeChanged(int32_t aNameSpaceID,
|
|
nsIAtom* aAttribute,
|
|
int32_t aModType)
|
|
{
|
|
if (aNameSpaceID != kNameSpaceID_None)
|
|
return NS_OK;
|
|
|
|
if (aAttribute == nsGkAtoms::transform) {
|
|
// We don't invalidate for transform changes (the layers code does that).
|
|
// Also note that SVGTransformableElement::GetAttributeChangeHint will
|
|
// return nsChangeHint_UpdateOverflow for "transform" attribute changes
|
|
// and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
|
|
|
|
if (!(mState & NS_FRAME_FIRST_REFLOW) &&
|
|
mCanvasTM && mCanvasTM->IsSingular()) {
|
|
// We won't have calculated the glyph positions correctly.
|
|
NotifyGlyphMetricsChange();
|
|
}
|
|
mCanvasTM = nullptr;
|
|
} else if (IsGlyphPositioningAttribute(aAttribute) ||
|
|
aAttribute == nsGkAtoms::textLength ||
|
|
aAttribute == nsGkAtoms::lengthAdjust) {
|
|
NotifyGlyphMetricsChange();
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
|
|
{
|
|
if (mState & NS_FRAME_IS_NONDISPLAY) {
|
|
// We need this DidSetStyleContext override to handle cases like this:
|
|
//
|
|
// <defs>
|
|
// <g>
|
|
// <mask>
|
|
// <text>...</text>
|
|
// </mask>
|
|
// </g>
|
|
// </defs>
|
|
//
|
|
// where the <text> is non-display, and a style change occurs on the <defs>,
|
|
// the <g>, the <mask>, or the <text> itself. If the style change happened
|
|
// on the parent of the <defs>, then in
|
|
// nsSVGDisplayContainerFrame::ReflowSVG, we would find the non-display
|
|
// <defs> container and then call ReflowSVGNonDisplayText on it. If we do
|
|
// not actually reflow the parent of the <defs>, then without this
|
|
// DidSetStyleContext we would (a) not cause the <text>'s anonymous block
|
|
// child to be reflowed when it is next painted, and (b) not cause the
|
|
// <text> to be repainted anyway since the user of the <mask> would not
|
|
// know it needs to be repainted.
|
|
ScheduleReflowSVGNonDisplayText(nsIPresShell::eStyleChange);
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::ReflowSVGNonDisplayText()
|
|
{
|
|
MOZ_ASSERT(nsSVGUtils::AnyOuterSVGIsCallingReflowSVG(this),
|
|
"only call ReflowSVGNonDisplayText when an outer SVG frame is "
|
|
"under ReflowSVG");
|
|
MOZ_ASSERT(mState & NS_FRAME_IS_NONDISPLAY,
|
|
"only call ReflowSVGNonDisplayText if the frame is "
|
|
"NS_FRAME_IS_NONDISPLAY");
|
|
|
|
// We had a style change, so we mark this frame as dirty so that the next
|
|
// time it is painted, we reflow the anonymous block frame.
|
|
AddStateBits(NS_FRAME_IS_DIRTY);
|
|
|
|
// We also need to call InvalidateRenderingObservers, so that if the <text>
|
|
// element is within a <mask>, say, the element referencing the <mask> will
|
|
// be updated, which will then cause this SVGTextFrame to be painted and
|
|
// in doing so cause the anonymous block frame to be reflowed.
|
|
nsLayoutUtils::PostRestyleEvent(
|
|
mContent->AsElement(), nsRestyleHint(0),
|
|
nsChangeHint_InvalidateRenderingObservers);
|
|
|
|
// Finally, we need to actually reflow the anonymous block frame and update
|
|
// mPositions, in case we are being reflowed immediately after a DOM
|
|
// mutation that needs frame reconstruction.
|
|
MaybeReflowAnonymousBlockChild();
|
|
UpdateGlyphPositioning();
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::ScheduleReflowSVGNonDisplayText(nsIPresShell::IntrinsicDirty aReason)
|
|
{
|
|
MOZ_ASSERT(!nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
|
|
"do not call ScheduleReflowSVGNonDisplayText when the outer SVG "
|
|
"frame is under ReflowSVG");
|
|
MOZ_ASSERT(!(mState & NS_STATE_SVG_TEXT_IN_REFLOW),
|
|
"do not call ScheduleReflowSVGNonDisplayText while reflowing the "
|
|
"anonymous block child");
|
|
|
|
// We need to find an ancestor frame that we can call FrameNeedsReflow
|
|
// on that will cause the document to be marked as needing relayout,
|
|
// and for that ancestor (or some further ancestor) to be marked as
|
|
// a root to reflow. We choose the closest ancestor frame that is not
|
|
// NS_FRAME_IS_NONDISPLAY and which is either an outer SVG frame or a
|
|
// non-SVG frame. (We don't consider displayed SVG frame ancestors toerh
|
|
// than nsSVGOuterSVGFrame, since calling FrameNeedsReflow on those other
|
|
// SVG frames would do a bunch of unnecessary work on the SVG frames up to
|
|
// the nsSVGOuterSVGFrame.)
|
|
|
|
nsIFrame* f = this;
|
|
while (f) {
|
|
if (!(f->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
|
|
if (NS_SUBTREE_DIRTY(f)) {
|
|
// This is a displayed frame, so if it is already dirty, we will be reflowed
|
|
// soon anyway. No need to call FrameNeedsReflow again, then.
|
|
return;
|
|
}
|
|
if (!f->IsFrameOfType(eSVG) ||
|
|
(f->GetStateBits() & NS_STATE_IS_OUTER_SVG)) {
|
|
break;
|
|
}
|
|
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
|
|
}
|
|
f = f->GetParent();
|
|
}
|
|
|
|
MOZ_ASSERT(f, "should have found an ancestor frame to reflow");
|
|
|
|
PresContext()->PresShell()->FrameNeedsReflow(f, aReason, NS_FRAME_IS_DIRTY);
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS(SVGTextFrame::MutationObserver, nsIMutationObserver)
|
|
|
|
void
|
|
SVGTextFrame::MutationObserver::ContentAppended(nsIDocument* aDocument,
|
|
nsIContent* aContainer,
|
|
nsIContent* aFirstNewContent,
|
|
int32_t aNewIndexInContainer)
|
|
{
|
|
mFrame->NotifyGlyphMetricsChange();
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::MutationObserver::ContentInserted(
|
|
nsIDocument* aDocument,
|
|
nsIContent* aContainer,
|
|
nsIContent* aChild,
|
|
int32_t aIndexInContainer)
|
|
{
|
|
mFrame->NotifyGlyphMetricsChange();
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::MutationObserver::ContentRemoved(
|
|
nsIDocument *aDocument,
|
|
nsIContent* aContainer,
|
|
nsIContent* aChild,
|
|
int32_t aIndexInContainer,
|
|
nsIContent* aPreviousSibling)
|
|
{
|
|
mFrame->NotifyGlyphMetricsChange();
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::MutationObserver::CharacterDataChanged(
|
|
nsIDocument* aDocument,
|
|
nsIContent* aContent,
|
|
CharacterDataChangeInfo* aInfo)
|
|
{
|
|
mFrame->NotifyGlyphMetricsChange();
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::MutationObserver::AttributeChanged(
|
|
nsIDocument* aDocument,
|
|
mozilla::dom::Element* aElement,
|
|
int32_t aNameSpaceID,
|
|
nsIAtom* aAttribute,
|
|
int32_t aModType,
|
|
const nsAttrValue* aOldValue)
|
|
{
|
|
if (!aElement->IsSVGElement()) {
|
|
return;
|
|
}
|
|
|
|
// Attribute changes on this element will be handled by
|
|
// SVGTextFrame::AttributeChanged.
|
|
if (aElement == mFrame->GetContent()) {
|
|
return;
|
|
}
|
|
|
|
mFrame->HandleAttributeChangeInDescendant(aElement, aNameSpaceID, aAttribute);
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::HandleAttributeChangeInDescendant(Element* aElement,
|
|
int32_t aNameSpaceID,
|
|
nsIAtom* aAttribute)
|
|
{
|
|
if (aElement->IsSVGElement(nsGkAtoms::textPath)) {
|
|
if (aNameSpaceID == kNameSpaceID_None &&
|
|
aAttribute == nsGkAtoms::startOffset) {
|
|
NotifyGlyphMetricsChange();
|
|
} else if ((aNameSpaceID == kNameSpaceID_XLink ||
|
|
aNameSpaceID == kNameSpaceID_None) &&
|
|
aAttribute == nsGkAtoms::href) {
|
|
// Blow away our reference, if any
|
|
nsIFrame* childElementFrame = aElement->GetPrimaryFrame();
|
|
if (childElementFrame) {
|
|
childElementFrame->DeleteProperty(
|
|
nsSVGEffects::HrefAsTextPathProperty());
|
|
NotifyGlyphMetricsChange();
|
|
}
|
|
}
|
|
} else {
|
|
if (aNameSpaceID == kNameSpaceID_None &&
|
|
IsGlyphPositioningAttribute(aAttribute)) {
|
|
NotifyGlyphMetricsChange();
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::FindCloserFrameForSelection(
|
|
nsPoint aPoint,
|
|
nsIFrame::FrameWithDistance* aCurrentBestFrame)
|
|
{
|
|
if (GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
|
|
return;
|
|
}
|
|
|
|
UpdateGlyphPositioning();
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
// Find the frame that has the closest rendered run rect to aPoint.
|
|
TextRenderedRunIterator it(this);
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
uint32_t flags = TextRenderedRun::eIncludeFill |
|
|
TextRenderedRun::eIncludeStroke |
|
|
TextRenderedRun::eNoHorizontalOverflow;
|
|
SVGBBox userRect = run.GetUserSpaceRect(presContext, flags);
|
|
float devPxPerCSSPx = presContext->CSSPixelsToDevPixels(1.f);
|
|
userRect.Scale(devPxPerCSSPx);
|
|
|
|
if (!userRect.IsEmpty()) {
|
|
gfxMatrix m;
|
|
if (!NS_SVGDisplayListHitTestingEnabled()) {
|
|
m = GetCanvasTM();
|
|
}
|
|
nsRect rect = nsSVGUtils::ToCanvasBounds(userRect.ToThebesRect(), m,
|
|
presContext);
|
|
|
|
if (nsLayoutUtils::PointIsCloserToRect(aPoint, rect,
|
|
aCurrentBestFrame->mXDistance,
|
|
aCurrentBestFrame->mYDistance)) {
|
|
aCurrentBestFrame->mFrame = run.mFrame;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// nsSVGDisplayableFrame methods
|
|
|
|
void
|
|
SVGTextFrame::NotifySVGChanged(uint32_t aFlags)
|
|
{
|
|
MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
|
|
"Invalidation logic may need adjusting");
|
|
|
|
bool needNewBounds = false;
|
|
bool needGlyphMetricsUpdate = false;
|
|
bool needNewCanvasTM = false;
|
|
|
|
if ((aFlags & COORD_CONTEXT_CHANGED) &&
|
|
(mState & NS_STATE_SVG_POSITIONING_MAY_USE_PERCENTAGES)) {
|
|
needGlyphMetricsUpdate = true;
|
|
}
|
|
|
|
if (aFlags & TRANSFORM_CHANGED) {
|
|
needNewCanvasTM = true;
|
|
if (mCanvasTM && mCanvasTM->IsSingular()) {
|
|
// We won't have calculated the glyph positions correctly.
|
|
needNewBounds = true;
|
|
needGlyphMetricsUpdate = true;
|
|
}
|
|
if (StyleSVGReset()->HasNonScalingStroke()) {
|
|
// Stroke currently contributes to our mRect, and our stroke depends on
|
|
// the transform to our outer-<svg> if |vector-effect:non-scaling-stroke|.
|
|
needNewBounds = true;
|
|
}
|
|
}
|
|
|
|
// If the scale at which we computed our mFontSizeScaleFactor has changed by
|
|
// at least a factor of two, reflow the text. This avoids reflowing text
|
|
// at every tick of a transform animation, but ensures our glyph metrics
|
|
// do not get too far out of sync with the final font size on the screen.
|
|
if (needNewCanvasTM && mLastContextScale != 0.0f) {
|
|
mCanvasTM = nullptr;
|
|
// If we are a non-display frame, then we don't want to call
|
|
// GetCanvasTM(), since the context scale does not use it.
|
|
gfxMatrix newTM =
|
|
(mState & NS_FRAME_IS_NONDISPLAY) ? gfxMatrix() :
|
|
GetCanvasTM();
|
|
// Compare the old and new context scales.
|
|
float scale = GetContextScale(newTM);
|
|
float change = scale / mLastContextScale;
|
|
if (change >= 2.0f || change <= 0.5f) {
|
|
needNewBounds = true;
|
|
needGlyphMetricsUpdate = true;
|
|
}
|
|
}
|
|
|
|
if (needNewBounds) {
|
|
// Ancestor changes can't affect how we render from the perspective of
|
|
// any rendering observers that we may have, so we don't need to
|
|
// invalidate them. We also don't need to invalidate ourself, since our
|
|
// changed ancestor will have invalidated its entire area, which includes
|
|
// our area.
|
|
ScheduleReflowSVG();
|
|
}
|
|
|
|
if (needGlyphMetricsUpdate) {
|
|
// If we are positioned using percentage values we need to update our
|
|
// position whenever our viewport's dimensions change. But only do this if
|
|
// we have been reflowed once, otherwise the glyph positioning will be
|
|
// wrong. (We need to wait until bidi reordering has been done.)
|
|
if (!(mState & NS_FRAME_FIRST_REFLOW)) {
|
|
NotifyGlyphMetricsChange();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the offset into a DOM node that the specified caret is positioned at.
|
|
*/
|
|
static int32_t
|
|
GetCaretOffset(nsCaret* aCaret)
|
|
{
|
|
nsCOMPtr<nsISelection> selection = aCaret->GetSelection();
|
|
if (!selection) {
|
|
return -1;
|
|
}
|
|
|
|
int32_t offset = -1;
|
|
selection->GetAnchorOffset(&offset);
|
|
return offset;
|
|
}
|
|
|
|
/**
|
|
* Returns whether the caret should be painted for a given TextRenderedRun
|
|
* by checking whether the caret is in the range covered by the rendered run.
|
|
*
|
|
* @param aThisRun The TextRenderedRun to be painted.
|
|
* @param aCaret The caret.
|
|
*/
|
|
static bool
|
|
ShouldPaintCaret(const TextRenderedRun& aThisRun, nsCaret* aCaret)
|
|
{
|
|
int32_t caretOffset = GetCaretOffset(aCaret);
|
|
|
|
if (caretOffset < 0) {
|
|
return false;
|
|
}
|
|
|
|
if (uint32_t(caretOffset) >= aThisRun.mTextFrameContentOffset &&
|
|
uint32_t(caretOffset) < aThisRun.mTextFrameContentOffset +
|
|
aThisRun.mTextFrameContentLength) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::PaintSVG(gfxContext& aContext,
|
|
const gfxMatrix& aTransform,
|
|
imgDrawingParams& aImgParams,
|
|
const nsIntRect *aDirtyRect)
|
|
{
|
|
DrawTarget& aDrawTarget = *aContext.GetDrawTarget();
|
|
nsIFrame* kid = PrincipalChildList().FirstChild();
|
|
if (!kid) {
|
|
return;
|
|
}
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
gfxMatrix initialMatrix = aContext.CurrentMatrix();
|
|
|
|
if (mState & NS_FRAME_IS_NONDISPLAY) {
|
|
// If we are in a canvas DrawWindow call that used the
|
|
// DRAWWINDOW_DO_NOT_FLUSH flag, then we may still have out
|
|
// of date frames. Just don't paint anything if they are
|
|
// dirty.
|
|
if (presContext->PresShell()->InDrawWindowNotFlushing() &&
|
|
NS_SUBTREE_DIRTY(this)) {
|
|
return;
|
|
}
|
|
// Text frames inside <clipPath>, <mask>, etc. will never have had
|
|
// ReflowSVG called on them, so call UpdateGlyphPositioning to do this now.
|
|
UpdateGlyphPositioning();
|
|
} else if (NS_SUBTREE_DIRTY(this)) {
|
|
// If we are asked to paint before reflow has recomputed mPositions etc.
|
|
// directly via PaintSVG, rather than via a display list, then we need
|
|
// to bail out here too.
|
|
return;
|
|
}
|
|
|
|
if (aTransform.IsSingular()) {
|
|
NS_WARNING("Can't render text element!");
|
|
return;
|
|
}
|
|
|
|
gfxMatrix matrixForPaintServers = aTransform * initialMatrix;
|
|
|
|
// Check if we need to draw anything.
|
|
if (aDirtyRect) {
|
|
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
|
|
(mState & NS_FRAME_IS_NONDISPLAY),
|
|
"Display lists handle dirty rect intersection test");
|
|
nsRect dirtyRect(aDirtyRect->x, aDirtyRect->y,
|
|
aDirtyRect->width, aDirtyRect->height);
|
|
|
|
gfxFloat appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
|
|
gfxRect frameRect(mRect.x / appUnitsPerDevPixel,
|
|
mRect.y / appUnitsPerDevPixel,
|
|
mRect.width / appUnitsPerDevPixel,
|
|
mRect.height / appUnitsPerDevPixel);
|
|
|
|
nsRect canvasRect = nsLayoutUtils::RoundGfxRectToAppRect(
|
|
GetCanvasTM().TransformBounds(frameRect), 1);
|
|
if (!canvasRect.Intersects(dirtyRect)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// SVG frames' PaintSVG methods paint in CSS px, but normally frames paint in
|
|
// dev pixels. Here we multiply a CSS-px-to-dev-pixel factor onto aTransform
|
|
// so our non-SVG nsTextFrame children paint correctly.
|
|
auto auPerDevPx = presContext->AppUnitsPerDevPixel();
|
|
float cssPxPerDevPx = presContext->AppUnitsToFloatCSSPixels(auPerDevPx);
|
|
gfxMatrix canvasTMForChildren = aTransform;
|
|
canvasTMForChildren.PreScale(cssPxPerDevPx, cssPxPerDevPx);
|
|
initialMatrix.PreScale(1 / cssPxPerDevPx, 1 / cssPxPerDevPx);
|
|
|
|
gfxContextMatrixAutoSaveRestore matSR(&aContext);
|
|
aContext.NewPath();
|
|
aContext.Multiply(canvasTMForChildren);
|
|
gfxMatrix currentMatrix = aContext.CurrentMatrix();
|
|
|
|
RefPtr<nsCaret> caret = presContext->PresShell()->GetCaret();
|
|
nsRect caretRect;
|
|
nsIFrame* caretFrame = caret->GetPaintGeometry(&caretRect);
|
|
|
|
gfxContextAutoSaveRestore ctxSR;
|
|
TextRenderedRunIterator it(this, TextRenderedRunIterator::eVisibleFrames);
|
|
TextRenderedRun run = it.Current();
|
|
|
|
SVGContextPaint* outerContextPaint =
|
|
SVGContextPaint::GetContextPaint(mContent);
|
|
|
|
while (run.mFrame) {
|
|
nsTextFrame* frame = run.mFrame;
|
|
|
|
// Determine how much of the left and right edges of the text frame we
|
|
// need to ignore.
|
|
SVGCharClipDisplayItem item(run);
|
|
|
|
RefPtr<SVGContextPaintImpl> contextPaint = new SVGContextPaintImpl();
|
|
DrawMode drawMode = contextPaint->Init(&aDrawTarget,
|
|
initialMatrix,
|
|
frame, outerContextPaint,
|
|
aImgParams);
|
|
if (drawMode & DrawMode::GLYPH_STROKE) {
|
|
ctxSR.EnsureSaved(&aContext);
|
|
// This may change the gfxContext's transform (for non-scaling stroke),
|
|
// in which case this needs to happen before we call SetMatrix() below.
|
|
nsSVGUtils::SetupStrokeGeometry(frame, &aContext, outerContextPaint);
|
|
}
|
|
|
|
// Set up the transform for painting the text frame for the substring
|
|
// indicated by the run.
|
|
gfxMatrix runTransform =
|
|
run.GetTransformFromUserSpaceForPainting(presContext, item) *
|
|
currentMatrix;
|
|
aContext.SetMatrix(runTransform);
|
|
|
|
if (drawMode != DrawMode(0)) {
|
|
bool paintSVGGlyphs;
|
|
nsTextFrame::PaintTextParams params(&aContext);
|
|
params.framePt = gfxPoint();
|
|
params.dirtyRect = LayoutDevicePixel::
|
|
FromAppUnits(frame->GetVisualOverflowRect(), auPerDevPx);
|
|
params.contextPaint = contextPaint;
|
|
if (ShouldRenderAsPath(frame, paintSVGGlyphs)) {
|
|
SVGTextDrawPathCallbacks callbacks(this, aContext, frame,
|
|
matrixForPaintServers,
|
|
paintSVGGlyphs);
|
|
params.callbacks = &callbacks;
|
|
frame->PaintText(params, item);
|
|
} else {
|
|
frame->PaintText(params, item);
|
|
}
|
|
}
|
|
|
|
if (frame == caretFrame && ShouldPaintCaret(run, caret)) {
|
|
// XXX Should we be looking at the fill/stroke colours to paint the
|
|
// caret with, rather than using the color property?
|
|
caret->PaintCaret(aDrawTarget, frame, nsPoint());
|
|
aContext.NewPath();
|
|
}
|
|
|
|
run = it.Next();
|
|
}
|
|
}
|
|
|
|
nsIFrame*
|
|
SVGTextFrame::GetFrameForPoint(const gfxPoint& aPoint)
|
|
{
|
|
NS_ASSERTION(PrincipalChildList().FirstChild(), "must have a child frame");
|
|
|
|
if (mState & NS_FRAME_IS_NONDISPLAY) {
|
|
// Text frames inside <clipPath> will never have had ReflowSVG called on
|
|
// them, so call UpdateGlyphPositioning to do this now. (Text frames
|
|
// inside <mask> and other non-display containers will never need to
|
|
// be hit tested.)
|
|
UpdateGlyphPositioning();
|
|
} else {
|
|
NS_ASSERTION(!NS_SUBTREE_DIRTY(this), "reflow should have happened");
|
|
}
|
|
|
|
// Hit-testing any clip-path will typically be a lot quicker than the
|
|
// hit-testing of our text frames in the loop below, so we do the former up
|
|
// front to avoid unnecessarily wasting cycles on the latter.
|
|
if (!nsSVGUtils::HitTestClip(this, aPoint)) {
|
|
return nullptr;
|
|
}
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
// Ideally we'd iterate backwards so that we can just return the first frame
|
|
// that is under aPoint. In practice this will rarely matter though since it
|
|
// is rare for text in/under an SVG <text> element to overlap (i.e. the first
|
|
// text frame that is hit will likely be the only text frame that is hit).
|
|
|
|
TextRenderedRunIterator it(this);
|
|
nsIFrame* hit = nullptr;
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
uint16_t hitTestFlags = nsSVGUtils::GetGeometryHitTestFlags(run.mFrame);
|
|
if (!(hitTestFlags & (SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE))) {
|
|
continue;
|
|
}
|
|
|
|
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
|
|
if (!m.Invert()) {
|
|
return nullptr;
|
|
}
|
|
|
|
gfxPoint pointInRunUserSpace = m.TransformPoint(aPoint);
|
|
gfxRect frameRect =
|
|
run.GetRunUserSpaceRect(presContext, TextRenderedRun::eIncludeFill |
|
|
TextRenderedRun::eIncludeStroke).ToThebesRect();
|
|
|
|
if (Inside(frameRect, pointInRunUserSpace)) {
|
|
hit = run.mFrame;
|
|
}
|
|
}
|
|
return hit;
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::ReflowSVG()
|
|
{
|
|
NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
|
|
"This call is probaby a wasteful mistake");
|
|
|
|
MOZ_ASSERT(!(GetStateBits() & NS_FRAME_IS_NONDISPLAY),
|
|
"ReflowSVG mechanism not designed for this");
|
|
|
|
if (!nsSVGUtils::NeedsReflowSVG(this)) {
|
|
NS_ASSERTION(!(mState & NS_STATE_SVG_POSITIONING_DIRTY), "How did this happen?");
|
|
return;
|
|
}
|
|
|
|
MaybeReflowAnonymousBlockChild();
|
|
UpdateGlyphPositioning();
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
SVGBBox r;
|
|
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames);
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
uint32_t runFlags = 0;
|
|
if (run.mFrame->StyleSVG()->mFill.Type() != eStyleSVGPaintType_None) {
|
|
runFlags |= TextRenderedRun::eIncludeFill |
|
|
TextRenderedRun::eIncludeTextShadow;
|
|
}
|
|
if (nsSVGUtils::HasStroke(run.mFrame)) {
|
|
runFlags |= TextRenderedRun::eIncludeFill |
|
|
TextRenderedRun::eIncludeTextShadow;
|
|
}
|
|
// Our "visual" overflow rect needs to be valid for building display lists
|
|
// for hit testing, which means that for certain values of 'pointer-events'
|
|
// it needs to include the geometry of the fill or stroke even when the fill/
|
|
// stroke don't actually render (e.g. when stroke="none" or
|
|
// stroke-opacity="0"). GetGeometryHitTestFlags accounts for 'pointer-events'.
|
|
// The text-shadow is not part of the hit-test area.
|
|
uint16_t hitTestFlags = nsSVGUtils::GetGeometryHitTestFlags(run.mFrame);
|
|
if (hitTestFlags & SVG_HIT_TEST_FILL) {
|
|
runFlags |= TextRenderedRun::eIncludeFill;
|
|
}
|
|
if (hitTestFlags & SVG_HIT_TEST_STROKE) {
|
|
runFlags |= TextRenderedRun::eIncludeStroke;
|
|
}
|
|
|
|
if (runFlags) {
|
|
r.UnionEdges(run.GetUserSpaceRect(presContext, runFlags));
|
|
}
|
|
}
|
|
|
|
if (r.IsEmpty()) {
|
|
mRect.SetEmpty();
|
|
} else {
|
|
mRect =
|
|
nsLayoutUtils::RoundGfxRectToAppRect(r.ToThebesRect(), presContext->AppUnitsPerCSSPixel());
|
|
|
|
// Due to rounding issues when we have a transform applied, we sometimes
|
|
// don't include an additional row of pixels. For now, just inflate our
|
|
// covered region.
|
|
mRect.Inflate(presContext->AppUnitsPerDevPixel());
|
|
}
|
|
|
|
if (mState & NS_FRAME_FIRST_REFLOW) {
|
|
// Make sure we have our filter property (if any) before calling
|
|
// FinishAndStoreOverflow (subsequent filter changes are handled off
|
|
// nsChangeHint_UpdateEffects):
|
|
nsSVGEffects::UpdateEffects(this);
|
|
}
|
|
|
|
// Now unset the various reflow bits. Do this before calling
|
|
// FinishAndStoreOverflow since FinishAndStoreOverflow can require glyph
|
|
// positions (to resolve transform-origin).
|
|
mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
|
|
NS_FRAME_HAS_DIRTY_CHILDREN);
|
|
|
|
nsRect overflow = nsRect(nsPoint(0,0), mRect.Size());
|
|
nsOverflowAreas overflowAreas(overflow, overflow);
|
|
FinishAndStoreOverflow(overflowAreas, mRect.Size());
|
|
|
|
// XXX nsSVGContainerFrame::ReflowSVG only looks at its nsSVGDisplayableFrame
|
|
// children, and calls ConsiderChildOverflow on them. Does it matter
|
|
// that ConsiderChildOverflow won't be called on our children?
|
|
nsSVGDisplayContainerFrame::ReflowSVG();
|
|
}
|
|
|
|
/**
|
|
* Converts nsSVGUtils::eBBox* flags into TextRenderedRun flags appropriate
|
|
* for the specified rendered run.
|
|
*/
|
|
static uint32_t
|
|
TextRenderedRunFlagsForBBoxContribution(const TextRenderedRun& aRun,
|
|
uint32_t aBBoxFlags)
|
|
{
|
|
uint32_t flags = 0;
|
|
if ((aBBoxFlags & nsSVGUtils::eBBoxIncludeFillGeometry) ||
|
|
((aBBoxFlags & nsSVGUtils::eBBoxIncludeFill) &&
|
|
aRun.mFrame->StyleSVG()->mFill.Type() != eStyleSVGPaintType_None)) {
|
|
flags |= TextRenderedRun::eIncludeFill;
|
|
}
|
|
if ((aBBoxFlags & nsSVGUtils::eBBoxIncludeStrokeGeometry) ||
|
|
((aBBoxFlags & nsSVGUtils::eBBoxIncludeStroke) &&
|
|
nsSVGUtils::HasStroke(aRun.mFrame))) {
|
|
flags |= TextRenderedRun::eIncludeStroke;
|
|
}
|
|
return flags;
|
|
}
|
|
|
|
SVGBBox
|
|
SVGTextFrame::GetBBoxContribution(const gfx::Matrix &aToBBoxUserspace,
|
|
uint32_t aFlags)
|
|
{
|
|
NS_ASSERTION(PrincipalChildList().FirstChild(), "must have a child frame");
|
|
SVGBBox bbox;
|
|
|
|
if (aFlags & nsSVGUtils::eForGetClientRects) {
|
|
Rect rect = NSRectToRect(mRect, PresContext()->AppUnitsPerCSSPixel());
|
|
if (!rect.IsEmpty()) {
|
|
bbox = aToBBoxUserspace.TransformBounds(rect);
|
|
}
|
|
return bbox;
|
|
}
|
|
|
|
nsIFrame* kid = PrincipalChildList().FirstChild();
|
|
if (kid && NS_SUBTREE_DIRTY(kid)) {
|
|
// Return an empty bbox if our kid's subtree is dirty. This may be called
|
|
// in that situation, e.g. when we're building a display list after an
|
|
// interrupted reflow. This can also be called during reflow before we've
|
|
// been reflowed, e.g. if an earlier sibling is calling FinishAndStoreOverflow and
|
|
// needs our parent's perspective matrix, which depends on the SVG bbox
|
|
// contribution of this frame. In the latter situation, when all siblings have
|
|
// been reflowed, the parent will compute its perspective and rerun
|
|
// FinishAndStoreOverflow for all its children.
|
|
return bbox;
|
|
}
|
|
|
|
UpdateGlyphPositioning();
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
TextRenderedRunIterator it(this);
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
uint32_t flags = TextRenderedRunFlagsForBBoxContribution(run, aFlags);
|
|
gfxMatrix m = ThebesMatrix(aToBBoxUserspace);
|
|
SVGBBox bboxForRun =
|
|
run.GetUserSpaceRect(presContext, flags, &m);
|
|
bbox.UnionEdges(bboxForRun);
|
|
}
|
|
|
|
return bbox;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// nsSVGContainerFrame methods
|
|
|
|
gfxMatrix
|
|
SVGTextFrame::GetCanvasTM()
|
|
{
|
|
if (!mCanvasTM) {
|
|
NS_ASSERTION(GetParent(), "null parent");
|
|
NS_ASSERTION(!(GetStateBits() & NS_FRAME_IS_NONDISPLAY),
|
|
"should not call GetCanvasTM() when we are non-display");
|
|
|
|
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(GetParent());
|
|
dom::SVGTextContentElement *content = static_cast<dom::SVGTextContentElement*>(mContent);
|
|
|
|
gfxMatrix tm = content->PrependLocalTransformsTo(parent->GetCanvasTM());
|
|
|
|
mCanvasTM = new gfxMatrix(tm);
|
|
}
|
|
return *mCanvasTM;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// SVGTextFrame SVG DOM methods
|
|
|
|
/**
|
|
* Returns whether the specified node has any non-empty nsTextNodes
|
|
* beneath it.
|
|
*/
|
|
static bool
|
|
HasTextContent(nsIContent* aContent)
|
|
{
|
|
NS_ASSERTION(aContent, "expected non-null aContent");
|
|
|
|
TextNodeIterator it(aContent);
|
|
for (nsTextNode* text = it.Current(); text; text = it.Next()) {
|
|
if (text->TextLength() != 0) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns the number of DOM characters beneath the specified node.
|
|
*/
|
|
static uint32_t
|
|
GetTextContentLength(nsIContent* aContent)
|
|
{
|
|
NS_ASSERTION(aContent, "expected non-null aContent");
|
|
|
|
uint32_t length = 0;
|
|
TextNodeIterator it(aContent);
|
|
for (nsTextNode* text = it.Current(); text; text = it.Next()) {
|
|
length += text->TextLength();
|
|
}
|
|
return length;
|
|
}
|
|
|
|
int32_t
|
|
SVGTextFrame::ConvertTextElementCharIndexToAddressableIndex(
|
|
int32_t aIndex,
|
|
nsIContent* aContent)
|
|
{
|
|
CharIterator it(this, CharIterator::eOriginal, aContent);
|
|
if (!it.AdvanceToSubtree()) {
|
|
return -1;
|
|
}
|
|
int32_t result = 0;
|
|
int32_t textElementCharIndex;
|
|
while (!it.AtEnd() &&
|
|
it.IsWithinSubtree()) {
|
|
bool addressable = !it.IsOriginalCharUnaddressable();
|
|
textElementCharIndex = it.TextElementCharIndex();
|
|
it.Next();
|
|
uint32_t delta = it.TextElementCharIndex() - textElementCharIndex;
|
|
aIndex -= delta;
|
|
if (addressable) {
|
|
if (aIndex < 0) {
|
|
return result;
|
|
}
|
|
result += delta;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetNumberOfChars method for the specified
|
|
* text content element.
|
|
*/
|
|
uint32_t
|
|
SVGTextFrame::GetNumberOfChars(nsIContent* aContent)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
uint32_t n = 0;
|
|
CharIterator it(this, CharIterator::eAddressable, aContent);
|
|
if (it.AdvanceToSubtree()) {
|
|
while (!it.AtEnd() && it.IsWithinSubtree()) {
|
|
n++;
|
|
it.Next();
|
|
}
|
|
}
|
|
return n;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetComputedTextLength method for the specified
|
|
* text child element.
|
|
*/
|
|
float
|
|
SVGTextFrame::GetComputedTextLength(nsIContent* aContent)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
float cssPxPerDevPx = PresContext()->
|
|
AppUnitsToFloatCSSPixels(PresContext()->AppUnitsPerDevPixel());
|
|
|
|
nscoord length = 0;
|
|
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
|
aContent);
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
length += run.GetAdvanceWidth();
|
|
}
|
|
|
|
return PresContext()->AppUnitsToGfxUnits(length) *
|
|
cssPxPerDevPx * mLengthAdjustScaleFactor / mFontSizeScaleFactor;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM SelectSubString method for the specified
|
|
* text content element.
|
|
*/
|
|
nsresult
|
|
SVGTextFrame::SelectSubString(nsIContent* aContent,
|
|
uint32_t charnum, uint32_t nchars)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
// Convert charnum/nchars from addressable characters relative to
|
|
// aContent to global character indices.
|
|
CharIterator chit(this, CharIterator::eAddressable, aContent);
|
|
if (!chit.AdvanceToSubtree() ||
|
|
!chit.Next(charnum) ||
|
|
chit.IsAfterSubtree()) {
|
|
return NS_ERROR_DOM_INDEX_SIZE_ERR;
|
|
}
|
|
charnum = chit.TextElementCharIndex();
|
|
nsIContent* content = chit.TextFrame()->GetContent();
|
|
chit.NextWithinSubtree(nchars);
|
|
nchars = chit.TextElementCharIndex() - charnum;
|
|
|
|
RefPtr<nsFrameSelection> frameSelection = GetFrameSelection();
|
|
|
|
frameSelection->HandleClick(content, charnum, charnum + nchars,
|
|
false, false, CARET_ASSOCIATE_BEFORE);
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetSubStringLength method for the specified
|
|
* text content element.
|
|
*/
|
|
nsresult
|
|
SVGTextFrame::GetSubStringLength(nsIContent* aContent,
|
|
uint32_t charnum, uint32_t nchars,
|
|
float* aResult)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
// Convert charnum/nchars from addressable characters relative to
|
|
// aContent to global character indices.
|
|
CharIterator chit(this, CharIterator::eAddressable, aContent);
|
|
if (!chit.AdvanceToSubtree() ||
|
|
!chit.Next(charnum) ||
|
|
chit.IsAfterSubtree()) {
|
|
return NS_ERROR_DOM_INDEX_SIZE_ERR;
|
|
}
|
|
|
|
if (nchars == 0) {
|
|
*aResult = 0.0f;
|
|
return NS_OK;
|
|
}
|
|
|
|
charnum = chit.TextElementCharIndex();
|
|
chit.NextWithinSubtree(nchars);
|
|
nchars = chit.TextElementCharIndex() - charnum;
|
|
|
|
// Find each rendered run that intersects with the range defined
|
|
// by charnum/nchars.
|
|
nscoord textLength = 0;
|
|
TextRenderedRunIterator runIter(this, TextRenderedRunIterator::eAllFrames);
|
|
TextRenderedRun run = runIter.Current();
|
|
while (run.mFrame) {
|
|
// If this rendered run is past the substring we are interested in, we
|
|
// are done.
|
|
uint32_t offset = run.mTextElementCharIndex;
|
|
if (offset >= charnum + nchars) {
|
|
break;
|
|
}
|
|
|
|
// Intersect the substring we are interested in with the range covered by
|
|
// the rendered run.
|
|
uint32_t length = run.mTextFrameContentLength;
|
|
IntersectInterval(offset, length, charnum, nchars);
|
|
|
|
if (length != 0) {
|
|
// Convert offset into an index into the frame.
|
|
offset += run.mTextFrameContentOffset - run.mTextElementCharIndex;
|
|
|
|
gfxSkipCharsIterator skipCharsIter =
|
|
run.mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
|
gfxTextRun* textRun = run.mFrame->GetTextRun(nsTextFrame::eInflated);
|
|
Range range = ConvertOriginalToSkipped(skipCharsIter, offset, length);
|
|
|
|
// Accumulate the advance.
|
|
textLength += textRun->GetAdvanceWidth(range, nullptr);
|
|
}
|
|
|
|
run = runIter.Next();
|
|
}
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
float cssPxPerDevPx = presContext->
|
|
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
|
|
|
|
*aResult = presContext->AppUnitsToGfxUnits(textLength) *
|
|
cssPxPerDevPx / mFontSizeScaleFactor;
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetCharNumAtPosition method for the specified
|
|
* text content element.
|
|
*/
|
|
int32_t
|
|
SVGTextFrame::GetCharNumAtPosition(nsIContent* aContent,
|
|
mozilla::nsISVGPoint* aPoint)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
nsPresContext* context = PresContext();
|
|
|
|
gfxPoint p(aPoint->X(), aPoint->Y());
|
|
|
|
int32_t result = -1;
|
|
|
|
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames, aContent);
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
// Hit test this rendered run. Later runs will override earlier ones.
|
|
int32_t index = run.GetCharNumAtPosition(context, p);
|
|
if (index != -1) {
|
|
result = index + run.mTextElementCharIndex;
|
|
}
|
|
}
|
|
|
|
if (result == -1) {
|
|
return result;
|
|
}
|
|
|
|
return ConvertTextElementCharIndexToAddressableIndex(result, aContent);
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetStartPositionOfChar method for the specified
|
|
* text content element.
|
|
*/
|
|
nsresult
|
|
SVGTextFrame::GetStartPositionOfChar(nsIContent* aContent,
|
|
uint32_t aCharNum,
|
|
mozilla::nsISVGPoint** aResult)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
CharIterator it(this, CharIterator::eAddressable, aContent);
|
|
if (!it.AdvanceToSubtree() ||
|
|
!it.Next(aCharNum)) {
|
|
return NS_ERROR_DOM_INDEX_SIZE_ERR;
|
|
}
|
|
|
|
// We need to return the start position of the whole glyph.
|
|
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
|
|
|
NS_ADDREF(*aResult =
|
|
new DOMSVGPoint(ToPoint(mPositions[startIndex].mPosition)));
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetEndPositionOfChar method for the specified
|
|
* text content element.
|
|
*/
|
|
nsresult
|
|
SVGTextFrame::GetEndPositionOfChar(nsIContent* aContent,
|
|
uint32_t aCharNum,
|
|
mozilla::nsISVGPoint** aResult)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
CharIterator it(this, CharIterator::eAddressable, aContent);
|
|
if (!it.AdvanceToSubtree() ||
|
|
!it.Next(aCharNum)) {
|
|
return NS_ERROR_DOM_INDEX_SIZE_ERR;
|
|
}
|
|
|
|
// We need to return the end position of the whole glyph.
|
|
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
|
|
|
// Get the advance of the glyph.
|
|
gfxFloat advance = it.GetGlyphAdvance(PresContext());
|
|
if (it.TextRun()->IsRightToLeft()) {
|
|
advance = -advance;
|
|
}
|
|
|
|
// The end position is the start position plus the advance in the direction
|
|
// of the glyph's rotation.
|
|
Matrix m =
|
|
Matrix::Rotation(mPositions[startIndex].mAngle) *
|
|
Matrix::Translation(ToPoint(mPositions[startIndex].mPosition));
|
|
Point p = m.TransformPoint(Point(advance / mFontSizeScaleFactor, 0));
|
|
|
|
NS_ADDREF(*aResult = new DOMSVGPoint(p));
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetExtentOfChar method for the specified
|
|
* text content element.
|
|
*/
|
|
nsresult
|
|
SVGTextFrame::GetExtentOfChar(nsIContent* aContent,
|
|
uint32_t aCharNum,
|
|
dom::SVGIRect** aResult)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
CharIterator it(this, CharIterator::eAddressable, aContent);
|
|
if (!it.AdvanceToSubtree() ||
|
|
!it.Next(aCharNum)) {
|
|
return NS_ERROR_DOM_INDEX_SIZE_ERR;
|
|
}
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
float cssPxPerDevPx = presContext->
|
|
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
|
|
|
|
// We need to return the extent of the whole glyph.
|
|
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
|
|
|
// The ascent and descent gives the height of the glyph.
|
|
gfxFloat ascent, descent;
|
|
GetAscentAndDescentInAppUnits(it.TextFrame(), ascent, descent);
|
|
|
|
// Get the advance of the glyph.
|
|
gfxFloat advance = it.GetGlyphAdvance(presContext);
|
|
gfxFloat x = it.TextRun()->IsRightToLeft() ? -advance : 0.0;
|
|
|
|
// The horizontal extent is the origin of the glyph plus the advance
|
|
// in the direction of the glyph's rotation.
|
|
gfxMatrix m;
|
|
m.PreTranslate(mPositions[startIndex].mPosition);
|
|
m.PreRotate(mPositions[startIndex].mAngle);
|
|
m.PreScale(1 / mFontSizeScaleFactor, 1 / mFontSizeScaleFactor);
|
|
|
|
gfxRect glyphRect;
|
|
if (it.TextRun()->IsVertical()) {
|
|
glyphRect =
|
|
gfxRect(-presContext->AppUnitsToGfxUnits(descent) * cssPxPerDevPx, x,
|
|
presContext->AppUnitsToGfxUnits(ascent + descent) * cssPxPerDevPx,
|
|
advance);
|
|
} else {
|
|
glyphRect =
|
|
gfxRect(x, -presContext->AppUnitsToGfxUnits(ascent) * cssPxPerDevPx,
|
|
advance,
|
|
presContext->AppUnitsToGfxUnits(ascent + descent) * cssPxPerDevPx);
|
|
}
|
|
|
|
// Transform the glyph's rect into user space.
|
|
gfxRect r = m.TransformBounds(glyphRect);
|
|
|
|
NS_ADDREF(*aResult = new dom::SVGRect(aContent, r.x, r.y, r.width, r.height));
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Implements the SVG DOM GetRotationOfChar method for the specified
|
|
* text content element.
|
|
*/
|
|
nsresult
|
|
SVGTextFrame::GetRotationOfChar(nsIContent* aContent,
|
|
uint32_t aCharNum,
|
|
float* aResult)
|
|
{
|
|
UpdateGlyphPositioning();
|
|
|
|
CharIterator it(this, CharIterator::eAddressable, aContent);
|
|
if (!it.AdvanceToSubtree() ||
|
|
!it.Next(aCharNum)) {
|
|
return NS_ERROR_DOM_INDEX_SIZE_ERR;
|
|
}
|
|
|
|
*aResult = mPositions[it.TextElementCharIndex()].mAngle * 180.0 / M_PI;
|
|
return NS_OK;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// SVGTextFrame text layout methods
|
|
|
|
/**
|
|
* Given the character position array before values have been filled in
|
|
* to any unspecified positions, and an array of dx/dy values, returns whether
|
|
* a character at a given index should start a new rendered run.
|
|
*
|
|
* @param aPositions The array of character positions before unspecified
|
|
* positions have been filled in and dx/dy values have been added to them.
|
|
* @param aDeltas The array of dx/dy values.
|
|
* @param aIndex The character index in question.
|
|
*/
|
|
static bool
|
|
ShouldStartRunAtIndex(const nsTArray<CharPosition>& aPositions,
|
|
const nsTArray<gfxPoint>& aDeltas,
|
|
uint32_t aIndex)
|
|
{
|
|
if (aIndex == 0) {
|
|
return true;
|
|
}
|
|
|
|
if (aIndex < aPositions.Length()) {
|
|
// If an explicit x or y value was given, start a new run.
|
|
if (aPositions[aIndex].IsXSpecified() ||
|
|
aPositions[aIndex].IsYSpecified()) {
|
|
return true;
|
|
}
|
|
|
|
// If a non-zero rotation was given, or the previous character had a non-
|
|
// zero rotation, start a new run.
|
|
if ((aPositions[aIndex].IsAngleSpecified() &&
|
|
aPositions[aIndex].mAngle != 0.0f) ||
|
|
(aPositions[aIndex - 1].IsAngleSpecified() &&
|
|
(aPositions[aIndex - 1].mAngle != 0.0f))) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
if (aIndex < aDeltas.Length()) {
|
|
// If a non-zero dx or dy value was given, start a new run.
|
|
if (aDeltas[aIndex].x != 0.0 ||
|
|
aDeltas[aIndex].y != 0.0) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
SVGTextFrame::ResolvePositionsForNode(nsIContent* aContent,
|
|
uint32_t& aIndex,
|
|
bool aInTextPath,
|
|
bool& aForceStartOfChunk,
|
|
nsTArray<gfxPoint>& aDeltas)
|
|
{
|
|
if (aContent->IsNodeOfType(nsINode::eTEXT)) {
|
|
// We found a text node.
|
|
uint32_t length = static_cast<nsTextNode*>(aContent)->TextLength();
|
|
if (length) {
|
|
uint32_t end = aIndex + length;
|
|
if (MOZ_UNLIKELY(end > mPositions.Length())) {
|
|
MOZ_ASSERT_UNREACHABLE("length of mPositions does not match characters "
|
|
"found by iterating content");
|
|
return false;
|
|
}
|
|
if (aForceStartOfChunk) {
|
|
// Note this character as starting a new anchored chunk.
|
|
mPositions[aIndex].mStartOfChunk = true;
|
|
aForceStartOfChunk = false;
|
|
}
|
|
while (aIndex < end) {
|
|
// Record whether each of these characters should start a new rendered
|
|
// run. That is always the case for characters on a text path.
|
|
//
|
|
// Run boundaries due to rotate="" values are handled in
|
|
// DoGlyphPositioning.
|
|
if (aInTextPath || ShouldStartRunAtIndex(mPositions, aDeltas, aIndex)) {
|
|
mPositions[aIndex].mRunBoundary = true;
|
|
}
|
|
aIndex++;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Skip past elements that aren't text content elements.
|
|
if (!IsTextContentElement(aContent)) {
|
|
return true;
|
|
}
|
|
|
|
if (aContent->IsSVGElement(nsGkAtoms::textPath)) {
|
|
// <textPath> elements are as if they are specified with x="0" y="0", but
|
|
// only if they actually have some text content.
|
|
if (HasTextContent(aContent)) {
|
|
if (MOZ_UNLIKELY(aIndex >= mPositions.Length())) {
|
|
MOZ_ASSERT_UNREACHABLE("length of mPositions does not match characters "
|
|
"found by iterating content");
|
|
return false;
|
|
}
|
|
mPositions[aIndex].mPosition = gfxPoint();
|
|
mPositions[aIndex].mStartOfChunk = true;
|
|
}
|
|
} else if (!aContent->IsSVGElement(nsGkAtoms::a)) {
|
|
// We have a text content element that can have x/y/dx/dy/rotate attributes.
|
|
nsSVGElement* element = static_cast<nsSVGElement*>(aContent);
|
|
|
|
// Get x, y, dx, dy.
|
|
SVGUserUnitList x, y, dx, dy;
|
|
element->GetAnimatedLengthListValues(&x, &y, &dx, &dy, nullptr);
|
|
|
|
// Get rotate.
|
|
const SVGNumberList* rotate = nullptr;
|
|
SVGAnimatedNumberList* animatedRotate =
|
|
element->GetAnimatedNumberList(nsGkAtoms::rotate);
|
|
if (animatedRotate) {
|
|
rotate = &animatedRotate->GetAnimValue();
|
|
}
|
|
|
|
bool percentages = false;
|
|
uint32_t count = GetTextContentLength(aContent);
|
|
|
|
if (MOZ_UNLIKELY(aIndex + count > mPositions.Length())) {
|
|
MOZ_ASSERT_UNREACHABLE("length of mPositions does not match characters "
|
|
"found by iterating content");
|
|
return false;
|
|
}
|
|
|
|
// New text anchoring chunks start at each character assigned a position
|
|
// with x="" or y="", or if we forced one with aForceStartOfChunk due to
|
|
// being just after a <textPath>.
|
|
uint32_t newChunkCount = std::max(x.Length(), y.Length());
|
|
if (!newChunkCount && aForceStartOfChunk) {
|
|
newChunkCount = 1;
|
|
}
|
|
for (uint32_t i = 0, j = 0; i < newChunkCount && j < count; j++) {
|
|
if (!mPositions[aIndex + j].mUnaddressable) {
|
|
mPositions[aIndex + j].mStartOfChunk = true;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
// Copy dx="" and dy="" values into aDeltas.
|
|
if (!dx.IsEmpty() || !dy.IsEmpty()) {
|
|
// Any unspecified deltas when we grow the array just get left as 0s.
|
|
aDeltas.EnsureLengthAtLeast(aIndex + count);
|
|
for (uint32_t i = 0, j = 0; i < dx.Length() && j < count; j++) {
|
|
if (!mPositions[aIndex + j].mUnaddressable) {
|
|
aDeltas[aIndex + j].x = dx[i];
|
|
percentages = percentages || dx.HasPercentageValueAt(i);
|
|
i++;
|
|
}
|
|
}
|
|
for (uint32_t i = 0, j = 0; i < dy.Length() && j < count; j++) {
|
|
if (!mPositions[aIndex + j].mUnaddressable) {
|
|
aDeltas[aIndex + j].y = dy[i];
|
|
percentages = percentages || dy.HasPercentageValueAt(i);
|
|
i++;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Copy x="" and y="" values.
|
|
for (uint32_t i = 0, j = 0; i < x.Length() && j < count; j++) {
|
|
if (!mPositions[aIndex + j].mUnaddressable) {
|
|
mPositions[aIndex + j].mPosition.x = x[i];
|
|
percentages = percentages || x.HasPercentageValueAt(i);
|
|
i++;
|
|
}
|
|
}
|
|
for (uint32_t i = 0, j = 0; i < y.Length() && j < count; j++) {
|
|
if (!mPositions[aIndex + j].mUnaddressable) {
|
|
mPositions[aIndex + j].mPosition.y = y[i];
|
|
percentages = percentages || y.HasPercentageValueAt(i);
|
|
i++;
|
|
}
|
|
}
|
|
|
|
// Copy rotate="" values.
|
|
if (rotate && !rotate->IsEmpty()) {
|
|
uint32_t i = 0, j = 0;
|
|
while (i < rotate->Length() && j < count) {
|
|
if (!mPositions[aIndex + j].mUnaddressable) {
|
|
mPositions[aIndex + j].mAngle = M_PI * (*rotate)[i] / 180.0;
|
|
i++;
|
|
}
|
|
j++;
|
|
}
|
|
// Propagate final rotate="" value to the end of this element.
|
|
while (j < count) {
|
|
mPositions[aIndex + j].mAngle = mPositions[aIndex + j - 1].mAngle;
|
|
j++;
|
|
}
|
|
}
|
|
|
|
if (percentages) {
|
|
AddStateBits(NS_STATE_SVG_POSITIONING_MAY_USE_PERCENTAGES);
|
|
}
|
|
}
|
|
|
|
// Recurse to children.
|
|
bool inTextPath = aInTextPath || aContent->IsSVGElement(nsGkAtoms::textPath);
|
|
for (nsIContent* child = aContent->GetFirstChild();
|
|
child;
|
|
child = child->GetNextSibling()) {
|
|
bool ok = ResolvePositionsForNode(child, aIndex, inTextPath,
|
|
aForceStartOfChunk, aDeltas);
|
|
if (!ok) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (aContent->IsSVGElement(nsGkAtoms::textPath)) {
|
|
// Force a new anchored chunk just after a <textPath>.
|
|
aForceStartOfChunk = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
SVGTextFrame::ResolvePositions(nsTArray<gfxPoint>& aDeltas,
|
|
bool aRunPerGlyph)
|
|
{
|
|
NS_ASSERTION(mPositions.IsEmpty(), "expected mPositions to be empty");
|
|
RemoveStateBits(NS_STATE_SVG_POSITIONING_MAY_USE_PERCENTAGES);
|
|
|
|
CharIterator it(this, CharIterator::eOriginal);
|
|
if (it.AtEnd()) {
|
|
return false;
|
|
}
|
|
|
|
// We assume the first character position is (0,0) unless we later see
|
|
// otherwise, and note it as unaddressable if it is.
|
|
bool firstCharUnaddressable = it.IsOriginalCharUnaddressable();
|
|
mPositions.AppendElement(CharPosition::Unspecified(firstCharUnaddressable));
|
|
|
|
// Fill in unspecified positions for all remaining characters, noting
|
|
// them as unaddressable if they are.
|
|
uint32_t index = 0;
|
|
while (it.Next()) {
|
|
while (++index < it.TextElementCharIndex()) {
|
|
mPositions.AppendElement(CharPosition::Unspecified(false));
|
|
}
|
|
mPositions.AppendElement(CharPosition::Unspecified(
|
|
it.IsOriginalCharUnaddressable()));
|
|
}
|
|
while (++index < it.TextElementCharIndex()) {
|
|
mPositions.AppendElement(CharPosition::Unspecified(false));
|
|
}
|
|
|
|
// Recurse over the content and fill in character positions as we go.
|
|
bool forceStartOfChunk = false;
|
|
index = 0;
|
|
bool ok = ResolvePositionsForNode(mContent, index, aRunPerGlyph,
|
|
forceStartOfChunk, aDeltas);
|
|
return ok && index > 0;
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::DetermineCharPositions(nsTArray<nsPoint>& aPositions)
|
|
{
|
|
NS_ASSERTION(aPositions.IsEmpty(), "expected aPositions to be empty");
|
|
|
|
nsPoint position, lastPosition;
|
|
|
|
TextFrameIterator frit(this);
|
|
for (nsTextFrame* frame = frit.Current(); frame; frame = frit.Next()) {
|
|
gfxSkipCharsIterator it = frame->EnsureTextRun(nsTextFrame::eInflated);
|
|
gfxTextRun* textRun = frame->GetTextRun(nsTextFrame::eInflated);
|
|
|
|
// Reset the position to the new frame's position.
|
|
position = frit.Position();
|
|
if (textRun->IsVertical()) {
|
|
if (textRun->IsRightToLeft()) {
|
|
position.y += frame->GetRect().height;
|
|
}
|
|
position.x += GetBaselinePosition(frame, textRun,
|
|
frit.DominantBaseline(),
|
|
mFontSizeScaleFactor);
|
|
} else {
|
|
if (textRun->IsRightToLeft()) {
|
|
position.x += frame->GetRect().width;
|
|
}
|
|
position.y += GetBaselinePosition(frame, textRun,
|
|
frit.DominantBaseline(),
|
|
mFontSizeScaleFactor);
|
|
}
|
|
|
|
// Any characters not in a frame, e.g. when display:none.
|
|
for (uint32_t i = 0; i < frit.UndisplayedCharacters(); i++) {
|
|
aPositions.AppendElement(position);
|
|
}
|
|
|
|
// Any white space characters trimmed at the start of the line of text.
|
|
nsTextFrame::TrimmedOffsets trimmedOffsets =
|
|
frame->GetTrimmedOffsets(frame->GetContent()->GetText(), true);
|
|
while (it.GetOriginalOffset() < trimmedOffsets.mStart) {
|
|
aPositions.AppendElement(position);
|
|
it.AdvanceOriginal(1);
|
|
}
|
|
|
|
// If a ligature was started in the previous frame, we should record
|
|
// the ligature's start position, not any partial position.
|
|
while (it.GetOriginalOffset() < frame->GetContentEnd() &&
|
|
!it.IsOriginalCharSkipped() &&
|
|
(!textRun->IsLigatureGroupStart(it.GetSkippedOffset()) ||
|
|
!textRun->IsClusterStart(it.GetSkippedOffset()))) {
|
|
uint32_t offset = it.GetSkippedOffset();
|
|
nscoord advance = textRun->
|
|
GetAdvanceWidth(Range(offset, offset + 1), nullptr);
|
|
(textRun->IsVertical() ? position.y : position.x) +=
|
|
textRun->IsRightToLeft() ? -advance : advance;
|
|
aPositions.AppendElement(lastPosition);
|
|
it.AdvanceOriginal(1);
|
|
}
|
|
|
|
// The meat of the text frame.
|
|
while (it.GetOriginalOffset() < frame->GetContentEnd()) {
|
|
aPositions.AppendElement(position);
|
|
if (!it.IsOriginalCharSkipped() &&
|
|
textRun->IsLigatureGroupStart(it.GetSkippedOffset()) &&
|
|
textRun->IsClusterStart(it.GetSkippedOffset())) {
|
|
// A real visible character.
|
|
nscoord advance = textRun->
|
|
GetAdvanceWidth(ClusterRange(textRun, it), nullptr);
|
|
(textRun->IsVertical() ? position.y : position.x) +=
|
|
textRun->IsRightToLeft() ? -advance : advance;
|
|
lastPosition = position;
|
|
}
|
|
it.AdvanceOriginal(1);
|
|
}
|
|
}
|
|
|
|
// Finally any characters at the end that are not in a frame.
|
|
for (uint32_t i = 0; i < frit.UndisplayedCharacters(); i++) {
|
|
aPositions.AppendElement(position);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Physical text-anchor values.
|
|
*/
|
|
enum TextAnchorSide {
|
|
eAnchorLeft,
|
|
eAnchorMiddle,
|
|
eAnchorRight
|
|
};
|
|
|
|
/**
|
|
* Converts a logical text-anchor value to its physical value, based on whether
|
|
* it is for an RTL frame.
|
|
*/
|
|
static TextAnchorSide
|
|
ConvertLogicalTextAnchorToPhysical(uint8_t aTextAnchor, bool aIsRightToLeft)
|
|
{
|
|
NS_ASSERTION(aTextAnchor <= 3, "unexpected value for aTextAnchor");
|
|
if (!aIsRightToLeft)
|
|
return TextAnchorSide(aTextAnchor);
|
|
return TextAnchorSide(2 - aTextAnchor);
|
|
}
|
|
|
|
/**
|
|
* Shifts the recorded character positions for an anchored chunk.
|
|
*
|
|
* @param aCharPositions The recorded character positions.
|
|
* @param aChunkStart The character index the starts the anchored chunk. This
|
|
* character's initial position is the anchor point.
|
|
* @param aChunkEnd The character index just after the end of the anchored
|
|
* chunk.
|
|
* @param aVisIStartEdge The left/top-most edge of any of the glyphs within the
|
|
* anchored chunk.
|
|
* @param aVisIEndEdge The right/bottom-most edge of any of the glyphs within
|
|
* the anchored chunk.
|
|
* @param aAnchorSide The direction to anchor.
|
|
*/
|
|
static void
|
|
ShiftAnchoredChunk(nsTArray<mozilla::CharPosition>& aCharPositions,
|
|
uint32_t aChunkStart,
|
|
uint32_t aChunkEnd,
|
|
gfxFloat aVisIStartEdge,
|
|
gfxFloat aVisIEndEdge,
|
|
TextAnchorSide aAnchorSide,
|
|
bool aVertical)
|
|
{
|
|
NS_ASSERTION(aVisIStartEdge <= aVisIEndEdge,
|
|
"unexpected anchored chunk edges");
|
|
NS_ASSERTION(aChunkStart < aChunkEnd,
|
|
"unexpected values for aChunkStart and aChunkEnd");
|
|
|
|
gfxFloat shift = aVertical ? aCharPositions[aChunkStart].mPosition.y
|
|
: aCharPositions[aChunkStart].mPosition.x;
|
|
switch (aAnchorSide) {
|
|
case eAnchorLeft:
|
|
shift -= aVisIStartEdge;
|
|
break;
|
|
case eAnchorMiddle:
|
|
shift -= (aVisIStartEdge + aVisIEndEdge) / 2;
|
|
break;
|
|
case eAnchorRight:
|
|
shift -= aVisIEndEdge;
|
|
break;
|
|
default:
|
|
NS_NOTREACHED("unexpected value for aAnchorSide");
|
|
}
|
|
|
|
if (shift != 0.0) {
|
|
if (aVertical) {
|
|
for (uint32_t i = aChunkStart; i < aChunkEnd; i++) {
|
|
aCharPositions[i].mPosition.y += shift;
|
|
}
|
|
} else {
|
|
for (uint32_t i = aChunkStart; i < aChunkEnd; i++) {
|
|
aCharPositions[i].mPosition.x += shift;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::AdjustChunksForLineBreaks()
|
|
{
|
|
nsBlockFrame* block = nsLayoutUtils::GetAsBlock(PrincipalChildList().FirstChild());
|
|
NS_ASSERTION(block, "expected block frame");
|
|
|
|
nsBlockFrame::LineIterator line = block->LinesBegin();
|
|
|
|
CharIterator it(this, CharIterator::eOriginal);
|
|
while (!it.AtEnd() && line != block->LinesEnd()) {
|
|
if (it.TextFrame() == line->mFirstChild) {
|
|
mPositions[it.TextElementCharIndex()].mStartOfChunk = true;
|
|
line++;
|
|
}
|
|
it.AdvancePastCurrentFrame();
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::AdjustPositionsForClusters()
|
|
{
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
CharIterator it(this, CharIterator::eClusterOrLigatureGroupMiddle);
|
|
while (!it.AtEnd()) {
|
|
// Find the start of the cluster/ligature group.
|
|
uint32_t charIndex = it.TextElementCharIndex();
|
|
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
|
|
|
mPositions[charIndex].mClusterOrLigatureGroupMiddle = true;
|
|
|
|
// Don't allow different rotations on ligature parts.
|
|
bool rotationAdjusted = false;
|
|
double angle = mPositions[startIndex].mAngle;
|
|
if (mPositions[charIndex].mAngle != angle) {
|
|
mPositions[charIndex].mAngle = angle;
|
|
rotationAdjusted = true;
|
|
}
|
|
|
|
// Find out the partial glyph advance for this character and update
|
|
// the character position.
|
|
uint32_t partLength =
|
|
charIndex - startIndex - it.GlyphUndisplayedCharacters();
|
|
gfxFloat advance =
|
|
it.GetGlyphPartialAdvance(partLength, presContext) / mFontSizeScaleFactor;
|
|
gfxPoint direction = gfxPoint(cos(angle), sin(angle)) *
|
|
(it.TextRun()->IsRightToLeft() ? -1.0 : 1.0);
|
|
if (it.TextRun()->IsVertical()) {
|
|
Swap(direction.x, direction.y);
|
|
}
|
|
mPositions[charIndex].mPosition = mPositions[startIndex].mPosition +
|
|
direction * advance;
|
|
|
|
// Ensure any runs that would end in the middle of a ligature now end just
|
|
// after the ligature.
|
|
if (mPositions[charIndex].mRunBoundary) {
|
|
mPositions[charIndex].mRunBoundary = false;
|
|
if (charIndex + 1 < mPositions.Length()) {
|
|
mPositions[charIndex + 1].mRunBoundary = true;
|
|
}
|
|
} else if (rotationAdjusted) {
|
|
if (charIndex + 1 < mPositions.Length()) {
|
|
mPositions[charIndex + 1].mRunBoundary = true;
|
|
}
|
|
}
|
|
|
|
// Ensure any anchored chunks that would begin in the middle of a ligature
|
|
// now begin just after the ligature.
|
|
if (mPositions[charIndex].mStartOfChunk) {
|
|
mPositions[charIndex].mStartOfChunk = false;
|
|
if (charIndex + 1 < mPositions.Length()) {
|
|
mPositions[charIndex + 1].mStartOfChunk = true;
|
|
}
|
|
}
|
|
|
|
it.Next();
|
|
}
|
|
}
|
|
|
|
SVGPathElement*
|
|
SVGTextFrame::GetTextPathPathElement(nsIFrame* aTextPathFrame)
|
|
{
|
|
nsSVGTextPathProperty *property =
|
|
aTextPathFrame->GetProperty(nsSVGEffects::HrefAsTextPathProperty());
|
|
|
|
if (!property) {
|
|
nsIContent* content = aTextPathFrame->GetContent();
|
|
dom::SVGTextPathElement* tp = static_cast<dom::SVGTextPathElement*>(content);
|
|
nsAutoString href;
|
|
if (tp->mStringAttributes[dom::SVGTextPathElement::HREF].IsExplicitlySet()) {
|
|
tp->mStringAttributes[dom::SVGTextPathElement::HREF]
|
|
.GetAnimValue(href, tp);
|
|
} else {
|
|
tp->mStringAttributes[dom::SVGTextPathElement::XLINK_HREF]
|
|
.GetAnimValue(href, tp);
|
|
}
|
|
|
|
if (href.IsEmpty()) {
|
|
return nullptr; // no URL
|
|
}
|
|
|
|
nsCOMPtr<nsIURI> targetURI;
|
|
nsCOMPtr<nsIURI> base = content->GetBaseURI();
|
|
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
|
|
content->GetUncomposedDoc(), base);
|
|
|
|
property = nsSVGEffects::GetTextPathProperty(
|
|
targetURI,
|
|
aTextPathFrame,
|
|
nsSVGEffects::HrefAsTextPathProperty());
|
|
if (!property)
|
|
return nullptr;
|
|
}
|
|
|
|
Element* element = property->GetReferencedElement();
|
|
return (element && element->IsSVGElement(nsGkAtoms::path)) ?
|
|
static_cast<SVGPathElement*>(element) : nullptr;
|
|
}
|
|
|
|
already_AddRefed<Path>
|
|
SVGTextFrame::GetTextPath(nsIFrame* aTextPathFrame)
|
|
{
|
|
SVGPathElement* element = GetTextPathPathElement(aTextPathFrame);
|
|
if (!element) {
|
|
return nullptr;
|
|
}
|
|
|
|
RefPtr<Path> path = element->GetOrBuildPathForMeasuring();
|
|
if (!path) {
|
|
return nullptr;
|
|
}
|
|
|
|
gfxMatrix matrix = element->PrependLocalTransformsTo(gfxMatrix());
|
|
if (!matrix.IsIdentity()) {
|
|
RefPtr<PathBuilder> builder =
|
|
path->TransformedCopyToBuilder(ToMatrix(matrix));
|
|
path = builder->Finish();
|
|
}
|
|
|
|
return path.forget();
|
|
}
|
|
|
|
gfxFloat
|
|
SVGTextFrame::GetOffsetScale(nsIFrame* aTextPathFrame)
|
|
{
|
|
SVGPathElement* pathElement = GetTextPathPathElement(aTextPathFrame);
|
|
if (!pathElement)
|
|
return 1.0;
|
|
|
|
return pathElement->GetPathLengthScale(dom::SVGPathElement::eForTextPath);
|
|
}
|
|
|
|
gfxFloat
|
|
SVGTextFrame::GetStartOffset(nsIFrame* aTextPathFrame)
|
|
{
|
|
dom::SVGTextPathElement *tp =
|
|
static_cast<dom::SVGTextPathElement*>(aTextPathFrame->GetContent());
|
|
nsSVGLength2 *length =
|
|
&tp->mLengthAttributes[dom::SVGTextPathElement::STARTOFFSET];
|
|
|
|
if (length->IsPercentage()) {
|
|
RefPtr<Path> data = GetTextPath(aTextPathFrame);
|
|
return data ?
|
|
length->GetAnimValInSpecifiedUnits() * data->ComputeLength() / 100.0 :
|
|
0.0;
|
|
}
|
|
return length->GetAnimValue(tp) * GetOffsetScale(aTextPathFrame);
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::DoTextPathLayout()
|
|
{
|
|
nsPresContext* context = PresContext();
|
|
|
|
CharIterator it(this, CharIterator::eClusterAndLigatureGroupStart);
|
|
while (!it.AtEnd()) {
|
|
nsIFrame* textPathFrame = it.TextPathFrame();
|
|
if (!textPathFrame) {
|
|
// Skip past this frame if we're not in a text path.
|
|
it.AdvancePastCurrentFrame();
|
|
continue;
|
|
}
|
|
|
|
// Get the path itself.
|
|
RefPtr<Path> path = GetTextPath(textPathFrame);
|
|
if (!path) {
|
|
it.AdvancePastCurrentTextPathFrame();
|
|
continue;
|
|
}
|
|
|
|
nsIContent* textPath = textPathFrame->GetContent();
|
|
|
|
gfxFloat offset = GetStartOffset(textPathFrame);
|
|
Float pathLength = path->ComputeLength();
|
|
|
|
// Loop for each text frame in the text path.
|
|
do {
|
|
uint32_t i = it.TextElementCharIndex();
|
|
gfxFloat halfAdvance =
|
|
it.GetGlyphAdvance(context) / mFontSizeScaleFactor / 2.0;
|
|
gfxFloat sign = it.TextRun()->IsRightToLeft() ? -1.0 : 1.0;
|
|
bool vertical = it.TextRun()->IsVertical();
|
|
gfxFloat midx = (vertical ? mPositions[i].mPosition.y
|
|
: mPositions[i].mPosition.x) +
|
|
sign * halfAdvance + offset;
|
|
|
|
// Hide the character if it falls off the end of the path.
|
|
mPositions[i].mHidden = midx < 0 || midx > pathLength;
|
|
|
|
// Position the character on the path at the right angle.
|
|
Point tangent; // Unit vector tangent to the point we find.
|
|
Point pt = path->ComputePointAtLength(Float(midx), &tangent);
|
|
Float rotation = vertical ? atan2f(-tangent.x, tangent.y)
|
|
: atan2f(tangent.y, tangent.x);
|
|
Point normal(-tangent.y, tangent.x); // Unit vector normal to the point.
|
|
Point offsetFromPath = normal * (vertical ? -mPositions[i].mPosition.x
|
|
: mPositions[i].mPosition.y);
|
|
pt += offsetFromPath;
|
|
Point direction = tangent * sign;
|
|
mPositions[i].mPosition = ThebesPoint(pt) - ThebesPoint(direction) * halfAdvance;
|
|
mPositions[i].mAngle += rotation;
|
|
|
|
// Position any characters for a partial ligature.
|
|
for (uint32_t j = i + 1;
|
|
j < mPositions.Length() && mPositions[j].mClusterOrLigatureGroupMiddle;
|
|
j++) {
|
|
gfxPoint partialAdvance =
|
|
ThebesPoint(direction) * it.GetGlyphPartialAdvance(j - i, context) /
|
|
mFontSizeScaleFactor;
|
|
mPositions[j].mPosition = mPositions[i].mPosition + partialAdvance;
|
|
mPositions[j].mAngle = mPositions[i].mAngle;
|
|
mPositions[j].mHidden = mPositions[i].mHidden;
|
|
}
|
|
it.Next();
|
|
} while (it.TextPathFrame() &&
|
|
it.TextPathFrame()->GetContent() == textPath);
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::DoAnchoring()
|
|
{
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
CharIterator it(this, CharIterator::eOriginal);
|
|
|
|
// Don't need to worry about skipped or trimmed characters.
|
|
while (!it.AtEnd() &&
|
|
(it.IsOriginalCharSkipped() || it.IsOriginalCharTrimmed())) {
|
|
it.Next();
|
|
}
|
|
|
|
bool vertical = GetWritingMode().IsVertical();
|
|
uint32_t start = it.TextElementCharIndex();
|
|
while (start < mPositions.Length()) {
|
|
it.AdvanceToCharacter(start);
|
|
nsTextFrame* chunkFrame = it.TextFrame();
|
|
|
|
// Measure characters in this chunk to find the left-most and right-most
|
|
// edges of all glyphs within the chunk.
|
|
uint32_t index = it.TextElementCharIndex();
|
|
uint32_t end = start;
|
|
gfxFloat left = std::numeric_limits<gfxFloat>::infinity();
|
|
gfxFloat right = -std::numeric_limits<gfxFloat>::infinity();
|
|
do {
|
|
if (!it.IsOriginalCharSkipped() && !it.IsOriginalCharTrimmed()) {
|
|
gfxFloat advance = it.GetAdvance(presContext) / mFontSizeScaleFactor;
|
|
gfxFloat pos =
|
|
it.TextRun()->IsVertical() ? mPositions[index].mPosition.y
|
|
: mPositions[index].mPosition.x;
|
|
if (it.TextRun()->IsRightToLeft()) {
|
|
left = std::min(left, pos - advance);
|
|
right = std::max(right, pos);
|
|
} else {
|
|
left = std::min(left, pos);
|
|
right = std::max(right, pos + advance);
|
|
}
|
|
}
|
|
it.Next();
|
|
index = end = it.TextElementCharIndex();
|
|
} while (!it.AtEnd() && !mPositions[end].mStartOfChunk);
|
|
|
|
if (left != std::numeric_limits<gfxFloat>::infinity()) {
|
|
bool isRTL =
|
|
chunkFrame->StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL;
|
|
TextAnchorSide anchor =
|
|
ConvertLogicalTextAnchorToPhysical(chunkFrame->StyleSVG()->mTextAnchor,
|
|
isRTL);
|
|
|
|
ShiftAnchoredChunk(mPositions, start, end, left, right, anchor,
|
|
vertical);
|
|
}
|
|
|
|
start = it.TextElementCharIndex();
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::DoGlyphPositioning()
|
|
{
|
|
mPositions.Clear();
|
|
RemoveStateBits(NS_STATE_SVG_POSITIONING_DIRTY);
|
|
|
|
nsIFrame* kid = PrincipalChildList().FirstChild();
|
|
if (kid && NS_SUBTREE_DIRTY(kid)) {
|
|
MOZ_ASSERT(false, "should have already reflowed the kid");
|
|
return;
|
|
}
|
|
|
|
// Determine the positions of each character in app units.
|
|
nsTArray<nsPoint> charPositions;
|
|
DetermineCharPositions(charPositions);
|
|
|
|
if (charPositions.IsEmpty()) {
|
|
// No characters, so nothing to do.
|
|
return;
|
|
}
|
|
|
|
// If the textLength="" attribute was specified, then we need ResolvePositions
|
|
// to record that a new run starts with each glyph.
|
|
SVGTextContentElement* element = static_cast<SVGTextContentElement*>(mContent);
|
|
nsSVGLength2* textLengthAttr =
|
|
element->GetAnimatedLength(nsGkAtoms::textLength);
|
|
bool adjustingTextLength = textLengthAttr->IsExplicitlySet();
|
|
float expectedTextLength = textLengthAttr->GetAnimValue(element);
|
|
|
|
if (adjustingTextLength && expectedTextLength < 0.0f) {
|
|
// If textLength="" is less than zero, ignore it.
|
|
adjustingTextLength = false;
|
|
}
|
|
|
|
// Get the x, y, dx, dy, rotate values for the subtree.
|
|
nsTArray<gfxPoint> deltas;
|
|
if (!ResolvePositions(deltas, adjustingTextLength)) {
|
|
// If ResolvePositions returned false, it means either there were some
|
|
// characters in the DOM but none of them are displayed, or there was
|
|
// an error in processing mPositions. Clear out mPositions so that we don't
|
|
// attempt to do any painting later.
|
|
mPositions.Clear();
|
|
return;
|
|
}
|
|
|
|
// XXX We might be able to do less work when there is at most a single
|
|
// x/y/dx/dy position.
|
|
|
|
// Truncate the positioning arrays to the actual number of characters present.
|
|
TruncateTo(deltas, charPositions);
|
|
TruncateTo(mPositions, charPositions);
|
|
|
|
// Fill in an unspecified character position at index 0.
|
|
if (!mPositions[0].IsXSpecified()) {
|
|
mPositions[0].mPosition.x = 0.0;
|
|
}
|
|
if (!mPositions[0].IsYSpecified()) {
|
|
mPositions[0].mPosition.y = 0.0;
|
|
}
|
|
if (!mPositions[0].IsAngleSpecified()) {
|
|
mPositions[0].mAngle = 0.0;
|
|
}
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
bool vertical = GetWritingMode().IsVertical();
|
|
|
|
float cssPxPerDevPx = presContext->
|
|
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
|
|
double factor = cssPxPerDevPx / mFontSizeScaleFactor;
|
|
|
|
// Determine how much to compress or expand glyph positions due to
|
|
// textLength="" and lengthAdjust="".
|
|
double adjustment = 0.0;
|
|
mLengthAdjustScaleFactor = 1.0f;
|
|
if (adjustingTextLength) {
|
|
nscoord frameLength = vertical ? PrincipalChildList().FirstChild()->GetRect().height
|
|
: PrincipalChildList().FirstChild()->GetRect().width;
|
|
float actualTextLength =
|
|
static_cast<float>(presContext->AppUnitsToGfxUnits(frameLength) * factor);
|
|
|
|
RefPtr<SVGAnimatedEnumeration> lengthAdjustEnum = element->LengthAdjust();
|
|
uint16_t lengthAdjust = lengthAdjustEnum->AnimVal();
|
|
switch (lengthAdjust) {
|
|
case SVG_LENGTHADJUST_SPACINGANDGLYPHS:
|
|
// Scale the glyphs and their positions.
|
|
if (actualTextLength > 0) {
|
|
mLengthAdjustScaleFactor = expectedTextLength / actualTextLength;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
MOZ_ASSERT(lengthAdjust == SVG_LENGTHADJUST_SPACING);
|
|
// Just add space between each glyph.
|
|
int32_t adjustableSpaces = 0;
|
|
for (uint32_t i = 1; i < mPositions.Length(); i++) {
|
|
if (!mPositions[i].mUnaddressable) {
|
|
adjustableSpaces++;
|
|
}
|
|
}
|
|
if (adjustableSpaces) {
|
|
adjustment = (expectedTextLength - actualTextLength) / adjustableSpaces;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Fill in any unspecified character positions based on the positions recorded
|
|
// in charPositions, and also add in the dx/dy values.
|
|
if (!deltas.IsEmpty()) {
|
|
mPositions[0].mPosition += deltas[0];
|
|
}
|
|
|
|
gfxFloat xLengthAdjustFactor = vertical ? 1.0 : mLengthAdjustScaleFactor;
|
|
gfxFloat yLengthAdjustFactor = vertical ? mLengthAdjustScaleFactor : 1.0;
|
|
for (uint32_t i = 1; i < mPositions.Length(); i++) {
|
|
// Fill in unspecified x position.
|
|
if (!mPositions[i].IsXSpecified()) {
|
|
nscoord d = charPositions[i].x - charPositions[i - 1].x;
|
|
mPositions[i].mPosition.x =
|
|
mPositions[i - 1].mPosition.x +
|
|
presContext->AppUnitsToGfxUnits(d) * factor * xLengthAdjustFactor;
|
|
if (!vertical && !mPositions[i].mUnaddressable) {
|
|
mPositions[i].mPosition.x += adjustment;
|
|
}
|
|
}
|
|
// Fill in unspecified y position.
|
|
if (!mPositions[i].IsYSpecified()) {
|
|
nscoord d = charPositions[i].y - charPositions[i - 1].y;
|
|
mPositions[i].mPosition.y =
|
|
mPositions[i - 1].mPosition.y +
|
|
presContext->AppUnitsToGfxUnits(d) * factor * yLengthAdjustFactor;
|
|
if (vertical && !mPositions[i].mUnaddressable) {
|
|
mPositions[i].mPosition.y += adjustment;
|
|
}
|
|
}
|
|
// Add in dx/dy.
|
|
if (i < deltas.Length()) {
|
|
mPositions[i].mPosition += deltas[i];
|
|
}
|
|
// Fill in unspecified rotation values.
|
|
if (!mPositions[i].IsAngleSpecified()) {
|
|
mPositions[i].mAngle = 0.0f;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(mPositions.Length() == charPositions.Length());
|
|
|
|
AdjustChunksForLineBreaks();
|
|
AdjustPositionsForClusters();
|
|
DoAnchoring();
|
|
DoTextPathLayout();
|
|
}
|
|
|
|
bool
|
|
SVGTextFrame::ShouldRenderAsPath(nsTextFrame* aFrame,
|
|
bool& aShouldPaintSVGGlyphs)
|
|
{
|
|
// Rendering to a clip path.
|
|
if (HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD)) {
|
|
aShouldPaintSVGGlyphs = false;
|
|
return true;
|
|
}
|
|
|
|
aShouldPaintSVGGlyphs = true;
|
|
|
|
const nsStyleSVG* style = aFrame->StyleSVG();
|
|
|
|
// Fill is a non-solid paint, has a non-default fill-rule or has
|
|
// non-1 opacity.
|
|
if (!(style->mFill.Type() == eStyleSVGPaintType_None ||
|
|
(style->mFill.Type() == eStyleSVGPaintType_Color &&
|
|
style->mFillOpacity == 1))) {
|
|
return true;
|
|
}
|
|
|
|
// Text has a stroke.
|
|
if (style->HasStroke() &&
|
|
SVGContentUtils::CoordToFloat(static_cast<nsSVGElement*>(mContent),
|
|
style->mStrokeWidth) > 0) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::ScheduleReflowSVG()
|
|
{
|
|
if (mState & NS_FRAME_IS_NONDISPLAY) {
|
|
ScheduleReflowSVGNonDisplayText(nsIPresShell::eStyleChange);
|
|
} else {
|
|
nsSVGUtils::ScheduleReflowSVG(this);
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::NotifyGlyphMetricsChange()
|
|
{
|
|
AddStateBits(NS_STATE_SVG_POSITIONING_DIRTY);
|
|
nsLayoutUtils::PostRestyleEvent(
|
|
mContent->AsElement(), nsRestyleHint(0),
|
|
nsChangeHint_InvalidateRenderingObservers);
|
|
ScheduleReflowSVG();
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::UpdateGlyphPositioning()
|
|
{
|
|
nsIFrame* kid = PrincipalChildList().FirstChild();
|
|
if (!kid) {
|
|
return;
|
|
}
|
|
|
|
if (mState & NS_STATE_SVG_POSITIONING_DIRTY) {
|
|
DoGlyphPositioning();
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::MaybeReflowAnonymousBlockChild()
|
|
{
|
|
nsIFrame* kid = PrincipalChildList().FirstChild();
|
|
if (!kid)
|
|
return;
|
|
|
|
NS_ASSERTION(!(kid->GetStateBits() & NS_FRAME_IN_REFLOW),
|
|
"should not be in reflow when about to reflow again");
|
|
|
|
if (NS_SUBTREE_DIRTY(this)) {
|
|
if (mState & NS_FRAME_IS_DIRTY) {
|
|
// If we require a full reflow, ensure our kid is marked fully dirty.
|
|
// (Note that our anonymous nsBlockFrame is not an nsSVGDisplayableFrame, so
|
|
// even when we are called via our ReflowSVG this will not be done for us
|
|
// by nsSVGDisplayContainerFrame::ReflowSVG.)
|
|
kid->AddStateBits(NS_FRAME_IS_DIRTY);
|
|
}
|
|
MOZ_ASSERT(nsSVGUtils::AnyOuterSVGIsCallingReflowSVG(this),
|
|
"should be under ReflowSVG");
|
|
nsPresContext::InterruptPreventer noInterrupts(PresContext());
|
|
DoReflow();
|
|
}
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::DoReflow()
|
|
{
|
|
// Since we are going to reflow the anonymous block frame, we will
|
|
// need to update mPositions.
|
|
AddStateBits(NS_STATE_SVG_POSITIONING_DIRTY);
|
|
|
|
if (mState & NS_FRAME_IS_NONDISPLAY) {
|
|
// Normally, these dirty flags would be cleared in ReflowSVG(), but that
|
|
// doesn't get called for non-display frames. We don't want to reflow our
|
|
// descendants every time SVGTextFrame::PaintSVG makes sure that we have
|
|
// valid positions by calling UpdateGlyphPositioning(), so we need to clear
|
|
// these dirty bits. Note that this also breaks an invalidation loop where
|
|
// our descendants invalidate as they reflow, which invalidates rendering
|
|
// observers, which reschedules the frame that is currently painting by
|
|
// referencing us to paint again. See bug 839958 comment 7. Hopefully we
|
|
// will break that loop more convincingly at some point.
|
|
mState &= ~(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN);
|
|
}
|
|
|
|
nsPresContext *presContext = PresContext();
|
|
nsIFrame* kid = PrincipalChildList().FirstChild();
|
|
if (!kid)
|
|
return;
|
|
|
|
RefPtr<gfxContext> renderingContext =
|
|
presContext->PresShell()->CreateReferenceRenderingContext();
|
|
|
|
if (UpdateFontSizeScaleFactor()) {
|
|
// If the font size scale factor changed, we need the block to report
|
|
// an updated preferred width.
|
|
kid->MarkIntrinsicISizesDirty();
|
|
}
|
|
|
|
mState |= NS_STATE_SVG_TEXT_IN_REFLOW;
|
|
|
|
nscoord inlineSize = kid->GetPrefISize(renderingContext);
|
|
WritingMode wm = kid->GetWritingMode();
|
|
ReflowInput reflowInput(presContext, kid,
|
|
renderingContext,
|
|
LogicalSize(wm, inlineSize,
|
|
NS_UNCONSTRAINEDSIZE));
|
|
ReflowOutput desiredSize(reflowInput);
|
|
nsReflowStatus status;
|
|
|
|
NS_ASSERTION(reflowInput.ComputedPhysicalBorderPadding() == nsMargin(0, 0, 0, 0) &&
|
|
reflowInput.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
|
|
"style system should ensure that :-moz-svg-text "
|
|
"does not get styled");
|
|
|
|
kid->Reflow(presContext, desiredSize, reflowInput, status);
|
|
kid->DidReflow(presContext, &reflowInput, nsDidReflowStatus::FINISHED);
|
|
kid->SetSize(wm, desiredSize.Size(wm));
|
|
|
|
mState &= ~NS_STATE_SVG_TEXT_IN_REFLOW;
|
|
|
|
TextNodeCorrespondenceRecorder::RecordCorrespondence(this);
|
|
}
|
|
|
|
// Usable font size range in devpixels / user-units
|
|
#define CLAMP_MIN_SIZE 8.0
|
|
#define CLAMP_MAX_SIZE 200.0
|
|
#define PRECISE_SIZE 200.0
|
|
|
|
bool
|
|
SVGTextFrame::UpdateFontSizeScaleFactor()
|
|
{
|
|
double oldFontSizeScaleFactor = mFontSizeScaleFactor;
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
bool geometricPrecision = false;
|
|
nscoord min = nscoord_MAX,
|
|
max = nscoord_MIN;
|
|
|
|
// Find the minimum and maximum font sizes used over all the
|
|
// nsTextFrames.
|
|
TextFrameIterator it(this);
|
|
nsTextFrame* f = it.Current();
|
|
while (f) {
|
|
if (!geometricPrecision) {
|
|
// Unfortunately we can't treat text-rendering:geometricPrecision
|
|
// separately for each text frame.
|
|
geometricPrecision = f->StyleText()->mTextRendering ==
|
|
NS_STYLE_TEXT_RENDERING_GEOMETRICPRECISION;
|
|
}
|
|
nscoord size = f->StyleFont()->mFont.size;
|
|
if (size) {
|
|
min = std::min(min, size);
|
|
max = std::max(max, size);
|
|
}
|
|
f = it.Next();
|
|
}
|
|
|
|
if (min == nscoord_MAX) {
|
|
// No text, so no need for scaling.
|
|
mFontSizeScaleFactor = 1.0;
|
|
return mFontSizeScaleFactor != oldFontSizeScaleFactor;
|
|
}
|
|
|
|
double minSize = presContext->AppUnitsToFloatCSSPixels(min);
|
|
|
|
if (geometricPrecision) {
|
|
// We want to ensure minSize is scaled to PRECISE_SIZE.
|
|
mFontSizeScaleFactor = PRECISE_SIZE / minSize;
|
|
return mFontSizeScaleFactor != oldFontSizeScaleFactor;
|
|
}
|
|
|
|
// When we are non-display, we could be painted in different coordinate
|
|
// spaces, and we don't want to have to reflow for each of these. We
|
|
// just assume that the context scale is 1.0 for them all, so we don't
|
|
// get stuck with a font size scale factor based on whichever referencing
|
|
// frame happens to reflow first.
|
|
double contextScale = 1.0;
|
|
if (!(mState & NS_FRAME_IS_NONDISPLAY)) {
|
|
gfxMatrix m(GetCanvasTM());
|
|
if (!m.IsSingular()) {
|
|
contextScale = GetContextScale(m);
|
|
}
|
|
}
|
|
mLastContextScale = contextScale;
|
|
|
|
double maxSize = presContext->AppUnitsToFloatCSSPixels(max);
|
|
|
|
// But we want to ignore any scaling required due to HiDPI displays, since
|
|
// regular CSS text frames will still create text runs using the font size
|
|
// in CSS pixels, and we want SVG text to have the same rendering as HTML
|
|
// text for regular font sizes.
|
|
float cssPxPerDevPx =
|
|
presContext->AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
|
|
contextScale *= cssPxPerDevPx;
|
|
|
|
double minTextRunSize = minSize * contextScale;
|
|
double maxTextRunSize = maxSize * contextScale;
|
|
|
|
if (minTextRunSize >= CLAMP_MIN_SIZE &&
|
|
maxTextRunSize <= CLAMP_MAX_SIZE) {
|
|
// We are already in the ideal font size range for all text frames,
|
|
// so we only have to take into account the contextScale.
|
|
mFontSizeScaleFactor = contextScale;
|
|
} else if (maxSize / minSize > CLAMP_MAX_SIZE / CLAMP_MIN_SIZE) {
|
|
// We can't scale the font sizes so that all of the text frames lie
|
|
// within our ideal font size range, so we treat the minimum as more
|
|
// important and just scale so that minSize = CLAMP_MIN_SIZE.
|
|
mFontSizeScaleFactor = CLAMP_MIN_SIZE / minTextRunSize;
|
|
} else if (minTextRunSize < CLAMP_MIN_SIZE) {
|
|
mFontSizeScaleFactor = CLAMP_MIN_SIZE / minTextRunSize;
|
|
} else {
|
|
mFontSizeScaleFactor = CLAMP_MAX_SIZE / maxTextRunSize;
|
|
}
|
|
|
|
return mFontSizeScaleFactor != oldFontSizeScaleFactor;
|
|
}
|
|
|
|
double
|
|
SVGTextFrame::GetFontSizeScaleFactor() const
|
|
{
|
|
return mFontSizeScaleFactor;
|
|
}
|
|
|
|
/**
|
|
* Take aPoint, which is in the <text> element's user space, and convert
|
|
* it to the appropriate frame user space of aChildFrame according to
|
|
* which rendered run the point hits.
|
|
*/
|
|
Point
|
|
SVGTextFrame::TransformFramePointToTextChild(const Point& aPoint,
|
|
nsIFrame* aChildFrame)
|
|
{
|
|
NS_ASSERTION(aChildFrame &&
|
|
nsLayoutUtils::GetClosestFrameOfType
|
|
(aChildFrame->GetParent(), LayoutFrameType::SVGText) == this,
|
|
"aChildFrame must be a descendant of this frame");
|
|
|
|
UpdateGlyphPositioning();
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
// Add in the mRect offset to aPoint, as that will have been taken into
|
|
// account when transforming the point from the ancestor frame down
|
|
// to this one.
|
|
float cssPxPerDevPx = presContext->
|
|
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
|
|
float factor = presContext->AppUnitsPerCSSPixel();
|
|
Point framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
|
|
NSAppUnitsToFloatPixels(mRect.y, factor));
|
|
Point pointInUserSpace = aPoint * cssPxPerDevPx + framePosition;
|
|
|
|
// Find the closest rendered run for the text frames beneath aChildFrame.
|
|
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
|
aChildFrame);
|
|
TextRenderedRun hit;
|
|
gfxPoint pointInRun;
|
|
nscoord dx = nscoord_MAX;
|
|
nscoord dy = nscoord_MAX;
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
uint32_t flags = TextRenderedRun::eIncludeFill |
|
|
TextRenderedRun::eIncludeStroke |
|
|
TextRenderedRun::eNoHorizontalOverflow;
|
|
gfxRect runRect = run.GetRunUserSpaceRect(presContext, flags).ToThebesRect();
|
|
|
|
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
|
|
if (!m.Invert()) {
|
|
return aPoint;
|
|
}
|
|
gfxPoint pointInRunUserSpace = m.TransformPoint(ThebesPoint(pointInUserSpace));
|
|
|
|
if (Inside(runRect, pointInRunUserSpace)) {
|
|
// The point was inside the rendered run's rect, so we choose it.
|
|
dx = 0;
|
|
dy = 0;
|
|
pointInRun = pointInRunUserSpace;
|
|
hit = run;
|
|
} else if (nsLayoutUtils::PointIsCloserToRect(pointInRunUserSpace,
|
|
runRect, dx, dy)) {
|
|
// The point was closer to this rendered run's rect than any others
|
|
// we've seen so far.
|
|
pointInRun.x = clamped(pointInRunUserSpace.x,
|
|
runRect.X(), runRect.XMost());
|
|
pointInRun.y = clamped(pointInRunUserSpace.y,
|
|
runRect.Y(), runRect.YMost());
|
|
hit = run;
|
|
}
|
|
}
|
|
|
|
if (!hit.mFrame) {
|
|
// We didn't find any rendered runs for the frame.
|
|
return aPoint;
|
|
}
|
|
|
|
// Return the point in user units relative to the nsTextFrame,
|
|
// but taking into account mFontSizeScaleFactor.
|
|
gfxMatrix m = hit.GetTransformFromRunUserSpaceToFrameUserSpace(presContext);
|
|
m.PreScale(mFontSizeScaleFactor, mFontSizeScaleFactor);
|
|
return ToPoint(m.TransformPoint(pointInRun) / cssPxPerDevPx);
|
|
}
|
|
|
|
/**
|
|
* For each rendered run beneath aChildFrame, translate aRect from
|
|
* aChildFrame to the run's text frame, transform it then into
|
|
* the run's frame user space, intersect it with the run's
|
|
* frame user space rect, then transform it up to user space.
|
|
* The result is the union of all of these.
|
|
*/
|
|
gfxRect
|
|
SVGTextFrame::TransformFrameRectFromTextChild(const nsRect& aRect,
|
|
nsIFrame* aChildFrame)
|
|
{
|
|
NS_ASSERTION(aChildFrame &&
|
|
nsLayoutUtils::GetClosestFrameOfType
|
|
(aChildFrame->GetParent(), LayoutFrameType::SVGText) == this,
|
|
"aChildFrame must be a descendant of this frame");
|
|
|
|
UpdateGlyphPositioning();
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
gfxRect result;
|
|
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
|
aChildFrame);
|
|
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
|
// First, translate aRect from aChildFrame to this run's frame.
|
|
nsRect rectInTextFrame = aRect + aChildFrame->GetOffsetTo(run.mFrame);
|
|
|
|
// Scale it into frame user space.
|
|
gfxRect rectInFrameUserSpace =
|
|
AppUnitsToFloatCSSPixels(gfxRect(rectInTextFrame.x,
|
|
rectInTextFrame.y,
|
|
rectInTextFrame.width,
|
|
rectInTextFrame.height), presContext);
|
|
|
|
// Intersect it with the run.
|
|
uint32_t flags = TextRenderedRun::eIncludeFill |
|
|
TextRenderedRun::eIncludeStroke;
|
|
|
|
if (rectInFrameUserSpace.IntersectRect(rectInFrameUserSpace,
|
|
run.GetFrameUserSpaceRect(presContext, flags).ToThebesRect())) {
|
|
// Transform it up to user space of the <text>, also taking into
|
|
// account the font size scale.
|
|
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
|
|
m.PreScale(mFontSizeScaleFactor, mFontSizeScaleFactor);
|
|
gfxRect rectInUserSpace = m.TransformRect(rectInFrameUserSpace);
|
|
|
|
// Union it into the result.
|
|
result.UnionRect(result, rectInUserSpace);
|
|
}
|
|
}
|
|
|
|
// Subtract the mRect offset from the result, as our user space for
|
|
// this frame is relative to the top-left of mRect.
|
|
float factor = presContext->AppUnitsPerCSSPixel();
|
|
gfxPoint framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
|
|
NSAppUnitsToFloatPixels(mRect.y, factor));
|
|
|
|
return result - framePosition;
|
|
}
|
|
|
|
void
|
|
SVGTextFrame::AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult)
|
|
{
|
|
MOZ_ASSERT(PrincipalChildList().FirstChild(), "Must have our anon box");
|
|
aResult.AppendElement(OwnedAnonBox(PrincipalChildList().FirstChild()));
|
|
}
|