mirror of
https://github.com/mozilla/gecko-dev.git
synced 2025-02-21 17:59:34 +00:00
d2b6891283
This changes a number of callers that were previously bypassing the use of the correct language (with either no language or the charset-detected language on the pres context via nsPresContext::GetMetricsFor) and/or the correct user font set to pass the correct values, which should improve the correctness of the behavior of whatever they were using the fonts for, and also reduce the number of unique sets of font metrics requested (which helps nsFontCache effectiveness).
356 lines
14 KiB
C++
356 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Mozilla MathML Project.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* The University Of Queensland.
|
|
* Portions created by the Initial Developer are Copyright (C) 1999
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Roger B. Sidje <rbs@maths.uq.edu.au>
|
|
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
|
|
* Shyjan Mahamud <mahamud@cs.cmu.edu> (added TeX rendering rules)
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of the GNU General Public License Version 2 or later (the "GPL"),
|
|
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
|
|
#include "nsCOMPtr.h"
|
|
#include "nsFrame.h"
|
|
#include "nsPresContext.h"
|
|
#include "nsStyleContext.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "nsRenderingContext.h"
|
|
|
|
#include "nsMathMLmsubsupFrame.h"
|
|
|
|
//
|
|
// <msubsup> -- attach a subscript-superscript pair to a base - implementation
|
|
//
|
|
|
|
nsIFrame*
|
|
NS_NewMathMLmsubsupFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
|
|
{
|
|
return new (aPresShell) nsMathMLmsubsupFrame(aContext);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmsubsupFrame)
|
|
|
|
nsMathMLmsubsupFrame::~nsMathMLmsubsupFrame()
|
|
{
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsMathMLmsubsupFrame::TransmitAutomaticData()
|
|
{
|
|
// if our base is an embellished operator, let its state bubble to us
|
|
mPresentationData.baseFrame = mFrames.FirstChild();
|
|
GetEmbellishDataFrom(mPresentationData.baseFrame, mEmbellishData);
|
|
|
|
// 1. The REC says:
|
|
// The <msubsup> element increments scriptlevel by 1, and sets displaystyle to
|
|
// "false", within subscript and superscript, but leaves both attributes
|
|
// unchanged within base.
|
|
// 2. The TeXbook (Ch 17. p.141) says the superscript inherits the compression
|
|
// while the subscript is compressed
|
|
UpdatePresentationDataFromChildAt(1, -1,
|
|
~NS_MATHML_DISPLAYSTYLE,
|
|
NS_MATHML_DISPLAYSTYLE);
|
|
UpdatePresentationDataFromChildAt(1, 1,
|
|
NS_MATHML_COMPRESSED,
|
|
NS_MATHML_COMPRESSED);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
/* virtual */ nsresult
|
|
nsMathMLmsubsupFrame::Place(nsRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
// extra spacing between base and sup/subscript
|
|
nscoord scriptSpace = 0;
|
|
|
|
// check if the subscriptshift attribute is there
|
|
nsAutoString value;
|
|
nscoord subScriptShift = 0;
|
|
GetAttribute(mContent, mPresentationData.mstyle,
|
|
nsGkAtoms::subscriptshift_, value);
|
|
if (!value.IsEmpty()) {
|
|
nsCSSValue cssValue;
|
|
if (ParseNumericValue(value, cssValue) && cssValue.IsLengthUnit()) {
|
|
subScriptShift = CalcLength(PresContext(), mStyleContext, cssValue);
|
|
}
|
|
}
|
|
// check if the superscriptshift attribute is there
|
|
nscoord supScriptShift = 0;
|
|
GetAttribute(mContent, mPresentationData.mstyle,
|
|
nsGkAtoms::superscriptshift_, value);
|
|
if (!value.IsEmpty()) {
|
|
nsCSSValue cssValue;
|
|
if (ParseNumericValue(value, cssValue) && cssValue.IsLengthUnit()) {
|
|
supScriptShift = CalcLength(PresContext(), mStyleContext, cssValue);
|
|
}
|
|
}
|
|
|
|
return nsMathMLmsubsupFrame::PlaceSubSupScript(PresContext(),
|
|
aRenderingContext,
|
|
aPlaceOrigin,
|
|
aDesiredSize,
|
|
this,
|
|
subScriptShift,
|
|
supScriptShift,
|
|
scriptSpace);
|
|
}
|
|
|
|
// exported routine that both munderover and msubsup share.
|
|
// munderover uses this when movablelimits is set.
|
|
nsresult
|
|
nsMathMLmsubsupFrame::PlaceSubSupScript(nsPresContext* aPresContext,
|
|
nsRenderingContext& aRenderingContext,
|
|
PRBool aPlaceOrigin,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
nsMathMLContainerFrame* aFrame,
|
|
nscoord aUserSubScriptShift,
|
|
nscoord aUserSupScriptShift,
|
|
nscoord aScriptSpace)
|
|
{
|
|
// force the scriptSpace to be atleast 1 pixel
|
|
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
|
|
aScriptSpace = NS_MAX(onePixel, aScriptSpace);
|
|
|
|
////////////////////////////////////
|
|
// Get the children's desired sizes
|
|
|
|
nsHTMLReflowMetrics baseSize;
|
|
nsHTMLReflowMetrics subScriptSize;
|
|
nsHTMLReflowMetrics supScriptSize;
|
|
nsBoundingMetrics bmBase, bmSubScript, bmSupScript;
|
|
nsIFrame* subScriptFrame = nsnull;
|
|
nsIFrame* supScriptFrame = nsnull;
|
|
nsIFrame* baseFrame = aFrame->GetFirstChild(nsnull);
|
|
if (baseFrame)
|
|
subScriptFrame = baseFrame->GetNextSibling();
|
|
if (subScriptFrame)
|
|
supScriptFrame = subScriptFrame->GetNextSibling();
|
|
if (!baseFrame || !subScriptFrame || !supScriptFrame ||
|
|
supScriptFrame->GetNextSibling()) {
|
|
// report an error, encourage people to get their markups in order
|
|
return aFrame->ReflowError(aRenderingContext, aDesiredSize);
|
|
}
|
|
GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
|
|
GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
|
|
GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
|
|
|
|
// get the subdrop from the subscript font
|
|
nscoord subDrop;
|
|
GetSubDropFromChild(subScriptFrame, subDrop);
|
|
// parameter v, Rule 18a, App. G, TeXbook
|
|
nscoord minSubScriptShift = bmBase.descent + subDrop;
|
|
|
|
// get the supdrop from the supscript font
|
|
nscoord supDrop;
|
|
GetSupDropFromChild(supScriptFrame, supDrop);
|
|
// parameter u, Rule 18a, App. G, TeXbook
|
|
nscoord minSupScriptShift = bmBase.ascent - supDrop;
|
|
|
|
//////////////////
|
|
// Place Children
|
|
//////////////////
|
|
|
|
//////////////////////////////////////////////////
|
|
// Get subscript shift
|
|
// slightly different from nsMathMLmsubFrame.cpp
|
|
//////////////////////////////////////////////////
|
|
|
|
// subScriptShift{1,2}
|
|
// = minimum amount to shift the subscript down
|
|
// = sub{1,2} in TeXbook
|
|
// subScriptShift1 = subscriptshift attribute * x-height
|
|
nscoord subScriptShift1, subScriptShift2;
|
|
|
|
nsRefPtr<nsFontMetrics> fm;
|
|
nsLayoutUtils::GetFontMetricsForFrame(baseFrame, getter_AddRefs(fm));
|
|
aRenderingContext.SetFont(fm);
|
|
|
|
// get x-height (an ex)
|
|
nscoord xHeight = fm->XHeight();
|
|
|
|
nscoord ruleSize;
|
|
GetRuleThickness (aRenderingContext, fm, ruleSize);
|
|
|
|
// Get subScriptShift{1,2} default from font
|
|
GetSubScriptShifts (fm, subScriptShift1, subScriptShift2);
|
|
|
|
if (0 < aUserSubScriptShift) {
|
|
// the user has set the subscriptshift attribute
|
|
float scaler = ((float) subScriptShift2) / subScriptShift1;
|
|
subScriptShift1 = NS_MAX(subScriptShift1, aUserSubScriptShift);
|
|
subScriptShift2 = NSToCoordRound(scaler * subScriptShift1);
|
|
}
|
|
|
|
// get a tentative value for subscriptshift
|
|
// Rule 18d, App. G, TeXbook
|
|
nscoord subScriptShift =
|
|
NS_MAX(minSubScriptShift,NS_MAX(subScriptShift1,subScriptShift2));
|
|
|
|
//////////////////////////////////////////////////
|
|
// Get supscript shift
|
|
// same code from nsMathMLmsupFrame.cpp
|
|
//////////////////////////////////////////////////
|
|
|
|
// get min supscript shift limit from x-height
|
|
// = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
|
|
nscoord minShiftFromXHeight = (nscoord)
|
|
(bmSupScript.descent + (1.0f/4.0f) * xHeight);
|
|
|
|
// supScriptShift{1,2,3}
|
|
// = minimum amount to shift the supscript up
|
|
// = sup{1,2,3} in TeX
|
|
// supScriptShift1 = superscriptshift attribute * x-height
|
|
// Note that there are THREE values for supscript shifts depending
|
|
// on the current style
|
|
nscoord supScriptShift1, supScriptShift2, supScriptShift3;
|
|
// Set supScriptShift{1,2,3} default from font
|
|
GetSupScriptShifts (fm, supScriptShift1, supScriptShift2, supScriptShift3);
|
|
if (0 < aUserSupScriptShift) {
|
|
// the user has set the superscriptshift attribute
|
|
float scaler2 = ((float) supScriptShift2) / supScriptShift1;
|
|
float scaler3 = ((float) supScriptShift3) / supScriptShift1;
|
|
supScriptShift1 = NS_MAX(supScriptShift1, aUserSupScriptShift);
|
|
supScriptShift2 = NSToCoordRound(scaler2 * supScriptShift1);
|
|
supScriptShift3 = NSToCoordRound(scaler3 * supScriptShift1);
|
|
}
|
|
|
|
// get sup script shift depending on current script level and display style
|
|
// Rule 18c, App. G, TeXbook
|
|
nscoord supScriptShift;
|
|
nsPresentationData presentationData;
|
|
aFrame->GetPresentationData(presentationData);
|
|
if ( aFrame->GetStyleFont()->mScriptLevel == 0 &&
|
|
NS_MATHML_IS_DISPLAYSTYLE(presentationData.flags) &&
|
|
!NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
|
|
// Style D in TeXbook
|
|
supScriptShift = supScriptShift1;
|
|
}
|
|
else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
|
|
// Style C' in TeXbook = D',T',S',SS'
|
|
supScriptShift = supScriptShift3;
|
|
}
|
|
else {
|
|
// everything else = T,S,SS
|
|
supScriptShift = supScriptShift2;
|
|
}
|
|
|
|
// get tentative value for superscriptshift
|
|
// Rule 18c, App. G, TeXbook
|
|
supScriptShift =
|
|
NS_MAX(minSupScriptShift,NS_MAX(supScriptShift,minShiftFromXHeight));
|
|
|
|
//////////////////////////////////////////////////
|
|
// Negotiate between supScriptShift and subScriptShift
|
|
// so that there will be enough gap between them
|
|
// Rule 18e, App. G, TeXbook
|
|
//////////////////////////////////////////////////
|
|
|
|
nscoord gap =
|
|
(supScriptShift - bmSupScript.descent) -
|
|
(bmSubScript.ascent - subScriptShift);
|
|
if (gap < 4.0f * ruleSize) {
|
|
// adjust subScriptShift to get a gap of (4.0 * ruleSize)
|
|
subScriptShift += NSToCoordRound ((4.0f * ruleSize) - gap);
|
|
}
|
|
|
|
// next we want to ensure that the bottom of the superscript
|
|
// will be > (4/5) * x-height above baseline
|
|
gap = NSToCoordRound ((4.0f/5.0f) * xHeight -
|
|
(supScriptShift - bmSupScript.descent));
|
|
if (gap > 0) {
|
|
supScriptShift += gap;
|
|
subScriptShift -= gap;
|
|
}
|
|
|
|
//////////////////////////////////////////////////
|
|
// Do the Placing
|
|
//////////////////////////////////////////////////
|
|
|
|
// get bounding box for base + subscript + superscript
|
|
nsBoundingMetrics boundingMetrics;
|
|
boundingMetrics.ascent =
|
|
NS_MAX(bmBase.ascent, (bmSupScript.ascent + supScriptShift));
|
|
boundingMetrics.descent =
|
|
NS_MAX(bmBase.descent, (bmSubScript.descent + subScriptShift));
|
|
|
|
// leave aScriptSpace after both super/subscript
|
|
// add italicCorrection between base and superscript
|
|
// add "a little to spare" as well (see TeXbook Ch.11, p.64), as we
|
|
// estimate the italic creation ourselves and it isn't the same as TeX
|
|
nscoord italicCorrection;
|
|
GetItalicCorrection(bmBase, italicCorrection);
|
|
italicCorrection += onePixel;
|
|
boundingMetrics.width = bmBase.width + aScriptSpace +
|
|
NS_MAX((italicCorrection + bmSupScript.width), bmSubScript.width);
|
|
boundingMetrics.leftBearing = bmBase.leftBearing;
|
|
boundingMetrics.rightBearing = bmBase.width +
|
|
NS_MAX((italicCorrection + bmSupScript.rightBearing), bmSubScript.rightBearing);
|
|
aFrame->SetBoundingMetrics(boundingMetrics);
|
|
|
|
// reflow metrics
|
|
aDesiredSize.ascent =
|
|
NS_MAX(baseSize.ascent,
|
|
NS_MAX(subScriptSize.ascent - subScriptShift,
|
|
supScriptSize.ascent + supScriptShift));
|
|
aDesiredSize.height = aDesiredSize.ascent +
|
|
NS_MAX(baseSize.height - baseSize.ascent,
|
|
NS_MAX(subScriptSize.height - subScriptSize.ascent + subScriptShift,
|
|
supScriptSize.height - subScriptSize.ascent - supScriptShift));
|
|
aDesiredSize.width = boundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = boundingMetrics;
|
|
|
|
aFrame->SetReference(nsPoint(0, aDesiredSize.ascent));
|
|
|
|
if (aPlaceOrigin) {
|
|
nscoord dx, dy;
|
|
// now place the base ...
|
|
dx = 0; dy = aDesiredSize.ascent - baseSize.ascent;
|
|
FinishReflowChild(baseFrame, aPresContext, nsnull,
|
|
baseSize, dx, dy, 0);
|
|
// ... and subscript
|
|
dx = bmBase.width;
|
|
dy = aDesiredSize.ascent - (subScriptSize.ascent - subScriptShift);
|
|
FinishReflowChild(subScriptFrame, aPresContext, nsnull,
|
|
subScriptSize, dx, dy, 0);
|
|
// ... and the superscript
|
|
dx = bmBase.width + italicCorrection;
|
|
dy = aDesiredSize.ascent - (supScriptSize.ascent + supScriptShift);
|
|
FinishReflowChild(supScriptFrame, aPresContext, nsnull,
|
|
supScriptSize, dx, dy, 0);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|