mirror of
https://github.com/mozilla/gecko-dev.git
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485 lines
14 KiB
C++
485 lines
14 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 "nsSVGTextFrame.h"
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// Keep others in (case-insensitive) order:
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#include "nsGkAtoms.h"
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#include "nsIDOMSVGRect.h"
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#include "nsIDOMSVGTextElement.h"
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#include "nsISVGGlyphFragmentNode.h"
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#include "nsSVGGlyphFrame.h"
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#include "nsSVGGraphicElement.h"
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#include "nsSVGIntegrationUtils.h"
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#include "nsSVGPathElement.h"
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#include "nsSVGTextPathFrame.h"
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#include "nsSVGUtils.h"
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#include "SVGLengthList.h"
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using namespace mozilla;
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//----------------------------------------------------------------------
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// Implementation
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nsIFrame*
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NS_NewSVGTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsSVGTextFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsSVGTextFrame)
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//----------------------------------------------------------------------
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// nsIFrame methods
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#ifdef DEBUG
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NS_IMETHODIMP
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nsSVGTextFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsCOMPtr<nsIDOMSVGTextElement> text = do_QueryInterface(aContent);
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NS_ASSERTION(text, "Content is not an SVG text");
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return nsSVGTextFrameBase::Init(aContent, aParent, aPrevInFlow);
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}
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#endif /* DEBUG */
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NS_IMETHODIMP
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nsSVGTextFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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if (aNameSpaceID != kNameSpaceID_None)
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return NS_OK;
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if (aAttribute == nsGkAtoms::transform) {
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nsSVGUtils::InvalidateBounds(this, false);
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nsSVGUtils::ScheduleReflowSVG(this);
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NotifySVGChanged(TRANSFORM_CHANGED);
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} else if (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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nsSVGUtils::InvalidateBounds(this, false);
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nsSVGUtils::ScheduleReflowSVG(this);
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NotifyGlyphMetricsChange();
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}
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return NS_OK;
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}
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nsIAtom *
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nsSVGTextFrame::GetType() const
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{
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return nsGkAtoms::svgTextFrame;
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}
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NS_IMETHODIMP
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nsSVGTextFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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UpdateGlyphPositioning(true);
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return nsSVGTextFrameBase::BuildDisplayList(aBuilder, aDirtyRect, aLists);
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}
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//----------------------------------------------------------------------
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// nsSVGTextContainerFrame
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uint32_t
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nsSVGTextFrame::GetNumberOfChars()
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetNumberOfChars();
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}
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float
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nsSVGTextFrame::GetComputedTextLength()
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetComputedTextLength();
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}
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float
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nsSVGTextFrame::GetSubStringLength(uint32_t charnum, uint32_t nchars)
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetSubStringLength(charnum, nchars);
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}
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int32_t
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nsSVGTextFrame::GetCharNumAtPosition(DOMSVGPoint *point)
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetCharNumAtPosition(point);
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}
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NS_IMETHODIMP
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nsSVGTextFrame::GetStartPositionOfChar(uint32_t charnum, nsISupports **_retval)
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetStartPositionOfChar(charnum, _retval);
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}
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NS_IMETHODIMP
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nsSVGTextFrame::GetEndPositionOfChar(uint32_t charnum, nsISupports **_retval)
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetEndPositionOfChar(charnum, _retval);
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}
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NS_IMETHODIMP
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nsSVGTextFrame::GetExtentOfChar(uint32_t charnum, nsIDOMSVGRect **_retval)
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetExtentOfChar(charnum, _retval);
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}
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NS_IMETHODIMP
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nsSVGTextFrame::GetRotationOfChar(uint32_t charnum, float *_retval)
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{
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UpdateGlyphPositioning(false);
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return nsSVGTextFrameBase::GetRotationOfChar(charnum, _retval);
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}
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//----------------------------------------------------------------------
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// nsISVGChildFrame methods
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void
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nsSVGTextFrame::NotifySVGChanged(uint32_t aFlags)
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{
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NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
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"Invalidation logic may need adjusting");
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bool updateGlyphMetrics = false;
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if (aFlags & COORD_CONTEXT_CHANGED) {
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updateGlyphMetrics = true;
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}
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if (aFlags & TRANSFORM_CHANGED) {
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if (mCanvasTM && mCanvasTM->IsSingular()) {
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// We won't have calculated the glyph positions correctly
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updateGlyphMetrics = true;
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}
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// make sure our cached transform matrix gets (lazily) updated
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mCanvasTM = nullptr;
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}
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if (updateGlyphMetrics) {
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// Ancestor changes can't affect how we render from the perspective of
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// any rendering observers that we may have, so we don't need to
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// invalidate them. We also don't need to invalidate ourself, since our
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// changed ancestor will have invalidated its entire area, which includes
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// our area.
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// For perf reasons we call this before calling NotifySVGChanged() below.
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nsSVGUtils::ScheduleReflowSVG(this);
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}
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nsSVGTextFrameBase::NotifySVGChanged(aFlags);
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if (updateGlyphMetrics) {
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// If we are positioned using percentage values we need to update our
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// position whenever our viewport's dimensions change.
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// XXX We could check here whether the text frame or any of its children
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// have any percentage co-ordinates and only update if they don't. This
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// may not be worth it as we might need to check each glyph
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NotifyGlyphMetricsChange();
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}
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}
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NS_IMETHODIMP
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nsSVGTextFrame::PaintSVG(nsRenderingContext* aContext,
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const nsIntRect *aDirtyRect)
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{
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NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
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(mState & NS_STATE_SVG_NONDISPLAY_CHILD),
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"If display lists are enabled, only painting of non-display "
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"SVG should take this code path");
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UpdateGlyphPositioning(true);
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return nsSVGTextFrameBase::PaintSVG(aContext, aDirtyRect);
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}
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NS_IMETHODIMP_(nsIFrame*)
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nsSVGTextFrame::GetFrameForPoint(const nsPoint &aPoint)
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{
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NS_ASSERTION(!NS_SVGDisplayListHitTestingEnabled() ||
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(mState & NS_STATE_SVG_NONDISPLAY_CHILD),
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"If display lists are enabled, only hit-testing of non-display "
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"SVG should take this code path");
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UpdateGlyphPositioning(true);
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return nsSVGTextFrameBase::GetFrameForPoint(aPoint);
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}
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void
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nsSVGTextFrame::ReflowSVG()
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{
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NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
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"This call is probably a wasteful mistake");
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NS_ABORT_IF_FALSE(!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
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"ReflowSVG mechanism not designed for this");
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if (!nsSVGUtils::NeedsReflowSVG(this)) {
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NS_ASSERTION(!mPositioningDirty, "How did this happen?");
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return;
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}
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// UpdateGlyphPositioning may have been called under DOM calls and set
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// mPositioningDirty to false. We may now have better positioning, though, so
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// set it to true so that UpdateGlyphPositioning will do its work.
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mPositioningDirty = true;
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UpdateGlyphPositioning(false);
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// We leave it up to nsSVGTextFrameBase::ReflowSVG to invalidate. XXXSDL
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// With glyph positions updated, our descendants can invalidate their new
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// areas correctly:
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nsSVGTextFrameBase::ReflowSVG();
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}
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SVGBBox
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nsSVGTextFrame::GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
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uint32_t aFlags)
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{
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UpdateGlyphPositioning(true);
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return nsSVGTextFrameBase::GetBBoxContribution(aToBBoxUserspace, aFlags);
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}
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//----------------------------------------------------------------------
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// nsSVGContainerFrame methods:
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gfxMatrix
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nsSVGTextFrame::GetCanvasTM(uint32_t aFor)
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{
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if (!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD)) {
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if ((aFor == FOR_PAINTING && NS_SVGDisplayListPaintingEnabled()) ||
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(aFor == FOR_HIT_TESTING && NS_SVGDisplayListHitTestingEnabled())) {
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return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(this);
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}
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}
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if (!mCanvasTM) {
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NS_ASSERTION(mParent, "null parent");
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nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
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nsSVGGraphicElement *content = static_cast<nsSVGGraphicElement*>(mContent);
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gfxMatrix tm =
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content->PrependLocalTransformsTo(parent->GetCanvasTM(aFor));
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mCanvasTM = new gfxMatrix(tm);
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}
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return *mCanvasTM;
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}
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//----------------------------------------------------------------------
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//
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static void
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MarkDirtyBitsOnDescendants(nsIFrame *aFrame)
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{
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// Do not skip marking of aFrame or any of its descendants if they have
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// the NS_FRAME_IS_DIRTY set, because some of their descendants may not
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// have it set, and we need all descendants to be dirty.
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if (aFrame->GetStateBits() & (NS_FRAME_FIRST_REFLOW)) {
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// Nothing to do if our outer-<svg> hasn't yet had its initial reflow.
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return;
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}
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nsIFrame* kid = aFrame->GetFirstPrincipalChild();
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while (kid) {
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nsISVGChildFrame* svgkid = do_QueryFrame(kid);
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if (svgkid) {
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MarkDirtyBitsOnDescendants(kid);
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kid->AddStateBits(NS_FRAME_IS_DIRTY);
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}
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kid = kid->GetNextSibling();
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}
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}
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void
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nsSVGTextFrame::NotifyGlyphMetricsChange()
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{
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// NotifySVGChanged isn't appropriate here, so we just mark our descendants
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// as fully dirty to get ReflowSVG() called on them:
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MarkDirtyBitsOnDescendants(this);
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nsSVGUtils::InvalidateBounds(this, false);
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nsSVGUtils::ScheduleReflowSVG(this);
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mPositioningDirty = true;
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}
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void
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nsSVGTextFrame::SetWhitespaceHandling(nsSVGGlyphFrame *aFrame)
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{
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SetWhitespaceCompression();
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nsSVGGlyphFrame* firstFrame = aFrame;
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bool trimLeadingWhitespace = true;
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nsSVGGlyphFrame* lastNonWhitespaceFrame = aFrame;
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// If the previous frame ended with whitespace
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// then display of leading whitespace should be suppressed
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// when we are compressing whitespace.
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while (aFrame) {
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if (!aFrame->IsAllWhitespace()) {
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lastNonWhitespaceFrame = aFrame;
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}
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aFrame->SetTrimLeadingWhitespace(trimLeadingWhitespace);
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trimLeadingWhitespace = aFrame->EndsWithWhitespace();
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aFrame = aFrame->GetNextGlyphFrame();
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}
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// When there is only whitespace left we need to trim off
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// the end of the last frame that isn't entirely whitespace.
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// Making sure that we reset earlier frames as they may once
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// have been the last non-whitespace frame.
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aFrame = firstFrame;
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while (aFrame != lastNonWhitespaceFrame) {
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aFrame->SetTrimTrailingWhitespace(false);
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aFrame = aFrame->GetNextGlyphFrame();
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}
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// We're at the last non-whitespace frame so trim off the end
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// and make sure we set one of the trim bits so that any
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// further whitespace is compressed to nothing
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while (aFrame) {
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aFrame->SetTrimTrailingWhitespace(true);
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aFrame = aFrame->GetNextGlyphFrame();
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}
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}
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void
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nsSVGTextFrame::UpdateGlyphPositioning(bool aForceGlobalTransform)
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{
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if (!mPositioningDirty)
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return;
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mPositioningDirty = false;
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nsISVGGlyphFragmentNode* node = GetFirstGlyphFragmentChildNode();
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if (!node)
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return;
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nsSVGGlyphFrame *frame, *firstFrame;
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firstFrame = node->GetFirstGlyphFrame();
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if (!firstFrame) {
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return;
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}
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SetWhitespaceHandling(firstFrame);
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BuildPositionList(0, 0);
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gfxPoint ctp(0.0, 0.0);
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// loop over chunks
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while (firstFrame) {
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nsSVGTextPathFrame *textPath = firstFrame->FindTextPathParent();
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nsTArray<float> effectiveXList, effectiveYList;
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firstFrame->GetEffectiveXY(firstFrame->GetNumberOfChars(),
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effectiveXList, effectiveYList);
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if (!effectiveXList.IsEmpty()) ctp.x = effectiveXList[0];
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if (!textPath && !effectiveYList.IsEmpty()) ctp.y = effectiveYList[0];
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// check for startOffset on textPath
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if (textPath) {
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if (!textPath->GetPathFrame()) {
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// invalid text path, give up
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return;
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}
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ctp.x = textPath->GetStartOffset();
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}
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// determine x offset based on text_anchor:
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uint8_t anchor = firstFrame->GetTextAnchor();
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/**
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* XXXsmontagu: The SVG spec is very vague as to how 'text-anchor'
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* interacts with bidirectional text. It says:
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*
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* "For scripts that are inherently right to left such as Hebrew and
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* Arabic [text-anchor: start] is equivalent to right alignment."
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* and
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* "For scripts that are inherently right to left such as Hebrew and
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* Arabic, [text-anchor: end] is equivalent to left alignment.
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*
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* It's not clear how this should be implemented in terms of defined
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* properties, i.e. how one should determine that a particular element
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* contains a script that is inherently right to left.
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*
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* The code below follows http://www.w3.org/TR/SVGTiny12/text.html#TextAnchorProperty
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* and swaps the values of text-anchor: end and text-anchor: start
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* whenever the 'direction' property is rtl.
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*
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* This is probably the "right" thing to do, but other browsers don't do it,
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* so I am leaving it inside #if 0 for now for interoperability.
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*
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* See also XXXsmontagu comments in nsSVGGlyphFrame::EnsureTextRun
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*/
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#if 0
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if (GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
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if (anchor == NS_STYLE_TEXT_ANCHOR_END) {
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anchor = NS_STYLE_TEXT_ANCHOR_START;
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} else if (anchor == NS_STYLE_TEXT_ANCHOR_START) {
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anchor = NS_STYLE_TEXT_ANCHOR_END;
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}
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}
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#endif
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float chunkLength = 0.0f;
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if (anchor != NS_STYLE_TEXT_ANCHOR_START) {
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// need to get the total chunk length
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frame = firstFrame;
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while (frame) {
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chunkLength += frame->GetAdvance(aForceGlobalTransform);
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frame = frame->GetNextGlyphFrame();
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if (frame && frame->IsAbsolutelyPositioned())
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break;
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}
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}
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if (anchor == NS_STYLE_TEXT_ANCHOR_MIDDLE)
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ctp.x -= chunkLength/2.0f;
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else if (anchor == NS_STYLE_TEXT_ANCHOR_END)
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ctp.x -= chunkLength;
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// set position of each frame in this chunk:
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frame = firstFrame;
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while (frame) {
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frame->SetGlyphPosition(&ctp, aForceGlobalTransform);
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frame = frame->GetNextGlyphFrame();
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if (frame && frame->IsAbsolutelyPositioned())
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break;
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}
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firstFrame = frame;
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}
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}
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