mirror of
https://github.com/ManchildProductions/UXP-Fixed.git
synced 2026-05-27 21:18:52 +00:00
win7-7
cbb61ab832
Part 1: Remove current table item, as it's never set. Part 2: Get rid of generic table painting code, and handle each class separately. Part 4: Hoist outline skipping into col(group) frame code. Part 5: Skip box-shadow for table column and column groups. Part 6: Store column and column group backgrounds separately, and then append them before the rest of the table contents. Part 7: Pass rects in display list coordinates to AppendBackgroundItemsToTop. Part 8: Create column and column group background display items as part of the cell's BuildDisplayList. Part 9: Used cached values instead of calling nsDisplayListBuilder::ToReferenceFrame when possible, since it can be expensive when the requested frame isn't the builder's current frame. Part 10: Make sure we build display items for table parts where only the normal position is visible, since we may need to create background items for ancestors at that position. Part 11: Create an AutoBuildingDisplayList when we create background items for table columns and column groups, so that we initialize the invalidation state correctly.
663 lines
24 KiB
C++
663 lines
24 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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#include "nsMathMLmfracFrame.h"
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#include "gfxUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.h"
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#include "nsLayoutUtils.h"
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#include "nsPresContext.h"
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#include "nsRenderingContext.h"
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#include "nsDisplayList.h"
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#include "gfxContext.h"
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#include "nsMathMLElement.h"
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#include <algorithm>
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#include "gfxMathTable.h"
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using namespace mozilla;
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using namespace mozilla::gfx;
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//
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// <mfrac> -- form a fraction from two subexpressions - implementation
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//
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// various fraction line thicknesses (multiplicative values of the default rule thickness)
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#define THIN_FRACTION_LINE 0.5f
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#define THIN_FRACTION_LINE_MINIMUM_PIXELS 1 // minimum of 1 pixel
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#define THICK_FRACTION_LINE 2.0f
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#define THICK_FRACTION_LINE_MINIMUM_PIXELS 2 // minimum of 2 pixels
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nsIFrame*
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NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmfracFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmfracFrame)
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nsMathMLmfracFrame::~nsMathMLmfracFrame()
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{
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}
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eMathMLFrameType
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nsMathMLmfracFrame::GetMathMLFrameType()
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{
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// frac is "inner" in TeXBook, Appendix G, rule 15e. See also page 170.
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return eMathMLFrameType_Inner;
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}
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uint8_t
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nsMathMLmfracFrame::ScriptIncrement(nsIFrame* aFrame)
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{
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if (!StyleFont()->mMathDisplay &&
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aFrame && (mFrames.FirstChild() == aFrame ||
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mFrames.LastChild() == aFrame)) {
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return 1;
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}
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return 0;
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}
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NS_IMETHODIMP
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nsMathMLmfracFrame::TransmitAutomaticData()
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{
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// The TeXbook (Ch 17. p.141) says the numerator inherits the compression
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// while the denominator is compressed
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UpdatePresentationDataFromChildAt(1, 1,
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NS_MATHML_COMPRESSED,
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NS_MATHML_COMPRESSED);
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// If displaystyle is false, then scriptlevel is incremented, so notify the
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// children of this.
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if (!StyleFont()->mMathDisplay) {
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PropagateFrameFlagFor(mFrames.FirstChild(),
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NS_FRAME_MATHML_SCRIPT_DESCENDANT);
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PropagateFrameFlagFor(mFrames.LastChild(),
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NS_FRAME_MATHML_SCRIPT_DESCENDANT);
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}
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// if our numerator is an embellished operator, let its state bubble to us
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GetEmbellishDataFrom(mFrames.FirstChild(), mEmbellishData);
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if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) {
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// even when embellished, we need to record that <mfrac> won't fire
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// Stretch() on its embellished child
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mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
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}
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return NS_OK;
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}
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nscoord
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nsMathMLmfracFrame::CalcLineThickness(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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nsString& aThicknessAttribute,
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nscoord onePixel,
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nscoord aDefaultRuleThickness,
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float aFontSizeInflation)
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{
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nscoord defaultThickness = aDefaultRuleThickness;
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nscoord lineThickness = aDefaultRuleThickness;
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nscoord minimumThickness = onePixel;
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// linethickness
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//
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// "Specifies the thickness of the horizontal 'fraction bar', or 'rule'. The
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// default value is 'medium', 'thin' is thinner, but visible, 'thick' is
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// thicker; the exact thickness of these is left up to the rendering agent."
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//
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// values: length | "thin" | "medium" | "thick"
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// default: medium
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//
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if (!aThicknessAttribute.IsEmpty()) {
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if (aThicknessAttribute.EqualsLiteral("thin")) {
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lineThickness = NSToCoordFloor(defaultThickness * THIN_FRACTION_LINE);
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minimumThickness = onePixel * THIN_FRACTION_LINE_MINIMUM_PIXELS;
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// should visually decrease by at least one pixel, if default is not a pixel
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if (defaultThickness > onePixel && lineThickness > defaultThickness - onePixel)
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lineThickness = defaultThickness - onePixel;
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}
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else if (aThicknessAttribute.EqualsLiteral("medium")) {
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// medium is default
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}
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else if (aThicknessAttribute.EqualsLiteral("thick")) {
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lineThickness = NSToCoordCeil(defaultThickness * THICK_FRACTION_LINE);
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minimumThickness = onePixel * THICK_FRACTION_LINE_MINIMUM_PIXELS;
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// should visually increase by at least one pixel
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if (lineThickness < defaultThickness + onePixel)
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lineThickness = defaultThickness + onePixel;
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}
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else {
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// length value
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lineThickness = defaultThickness;
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ParseNumericValue(aThicknessAttribute, &lineThickness,
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nsMathMLElement::PARSE_ALLOW_UNITLESS,
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aPresContext, aStyleContext, aFontSizeInflation);
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}
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}
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// use minimum if the lineThickness is a non-zero value less than minimun
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if (lineThickness && lineThickness < minimumThickness)
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lineThickness = minimumThickness;
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return lineThickness;
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}
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void
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nsMathMLmfracFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists)
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{
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/////////////
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// paint the numerator and denominator
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nsMathMLContainerFrame::BuildDisplayList(aBuilder, aLists);
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/////////////
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// paint the fraction line
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if (mIsBevelled) {
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DisplaySlash(aBuilder, this, mLineRect, mLineThickness, aLists);
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} else {
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DisplayBar(aBuilder, this, mLineRect, aLists);
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}
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}
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nsresult
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nsMathMLmfracFrame::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 (nsGkAtoms::linethickness_ == aAttribute) {
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InvalidateFrame();
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}
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return
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nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
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aModType);
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}
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/* virtual */ nsresult
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nsMathMLmfracFrame::MeasureForWidth(DrawTarget* aDrawTarget,
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ReflowOutput& aDesiredSize)
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{
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return PlaceInternal(aDrawTarget, false, aDesiredSize, true);
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}
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nscoord
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nsMathMLmfracFrame::FixInterFrameSpacing(ReflowOutput& aDesiredSize)
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{
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nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
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if (!gap) return 0;
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mLineRect.MoveBy(gap, 0);
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return gap;
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}
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/* virtual */ nsresult
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nsMathMLmfracFrame::Place(DrawTarget* aDrawTarget,
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bool aPlaceOrigin,
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ReflowOutput& aDesiredSize)
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{
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return PlaceInternal(aDrawTarget, aPlaceOrigin, aDesiredSize, false);
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}
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nsresult
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nsMathMLmfracFrame::PlaceInternal(DrawTarget* aDrawTarget,
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bool aPlaceOrigin,
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ReflowOutput& aDesiredSize,
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bool aWidthOnly)
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{
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////////////////////////////////////
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// Get the children's desired sizes
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nsBoundingMetrics bmNum, bmDen;
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ReflowOutput sizeNum(aDesiredSize.GetWritingMode());
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ReflowOutput sizeDen(aDesiredSize.GetWritingMode());
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nsIFrame* frameDen = nullptr;
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nsIFrame* frameNum = mFrames.FirstChild();
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if (frameNum)
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frameDen = frameNum->GetNextSibling();
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if (!frameNum || !frameDen || frameDen->GetNextSibling()) {
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// report an error, encourage people to get their markups in order
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if (aPlaceOrigin) {
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ReportChildCountError();
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}
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return ReflowError(aDrawTarget, aDesiredSize);
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}
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GetReflowAndBoundingMetricsFor(frameNum, sizeNum, bmNum);
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GetReflowAndBoundingMetricsFor(frameDen, sizeDen, bmDen);
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nsPresContext* presContext = PresContext();
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nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
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float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
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nscoord defaultRuleThickness, axisHeight;
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nscoord oneDevPixel = fm->AppUnitsPerDevPixel();
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gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont();
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if (mathFont) {
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defaultRuleThickness = mathFont->MathTable()->
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Constant(gfxMathTable::FractionRuleThickness, oneDevPixel);
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} else {
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GetRuleThickness(aDrawTarget, fm, defaultRuleThickness);
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}
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GetAxisHeight(aDrawTarget, fm, axisHeight);
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bool outermostEmbellished = false;
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if (mEmbellishData.coreFrame) {
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nsEmbellishData parentData;
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GetEmbellishDataFrom(GetParent(), parentData);
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outermostEmbellished = parentData.coreFrame != mEmbellishData.coreFrame;
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}
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// see if the linethickness attribute is there
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nsAutoString value;
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::linethickness_, value);
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mLineThickness = CalcLineThickness(presContext, mStyleContext, value,
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onePixel, defaultRuleThickness,
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fontSizeInflation);
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// bevelled attribute
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::bevelled_, value);
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mIsBevelled = value.EqualsLiteral("true");
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bool displayStyle = StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK;
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if (!mIsBevelled) {
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mLineRect.height = mLineThickness;
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// by default, leave at least one-pixel padding at either end, and add
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// lspace & rspace that may come from <mo> if we are an outermost
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// embellished container (we fetch values from the core since they may use
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// units that depend on style data, and style changes could have occurred
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// in the core since our last visit there)
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nscoord leftSpace = onePixel;
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nscoord rightSpace = onePixel;
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if (outermostEmbellished) {
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nsEmbellishData coreData;
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GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData);
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leftSpace += StyleVisibility()->mDirection ?
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coreData.trailingSpace : coreData.leadingSpace;
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rightSpace += StyleVisibility()->mDirection ?
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coreData.leadingSpace : coreData.trailingSpace;
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}
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nscoord actualRuleThickness = mLineThickness;
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//////////////////
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// Get shifts
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nscoord numShift = 0;
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nscoord denShift = 0;
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// Rule 15b, App. G, TeXbook
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nscoord numShift1, numShift2, numShift3;
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nscoord denShift1, denShift2;
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GetNumeratorShifts(fm, numShift1, numShift2, numShift3);
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GetDenominatorShifts(fm, denShift1, denShift2);
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if (0 == actualRuleThickness) {
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numShift = displayStyle ? numShift1 : numShift3;
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denShift = displayStyle ? denShift1 : denShift2;
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if (mathFont) {
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numShift = mathFont->
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MathTable()->Constant(displayStyle ?
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gfxMathTable::StackTopDisplayStyleShiftUp :
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gfxMathTable::StackTopShiftUp,
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oneDevPixel);
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denShift = mathFont->
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MathTable()->Constant(displayStyle ?
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gfxMathTable::StackBottomDisplayStyleShiftDown :
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gfxMathTable::StackBottomShiftDown,
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oneDevPixel);
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}
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} else {
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numShift = displayStyle ? numShift1 : numShift2;
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denShift = displayStyle ? denShift1 : denShift2;
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if (mathFont) {
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numShift = mathFont->MathTable()->
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Constant(displayStyle ?
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gfxMathTable::FractionNumeratorDisplayStyleShiftUp :
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gfxMathTable::FractionNumeratorShiftUp,
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oneDevPixel);
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denShift = mathFont->MathTable()->
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Constant(displayStyle ?
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gfxMathTable::FractionDenominatorDisplayStyleShiftDown :
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gfxMathTable::FractionDenominatorShiftDown,
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oneDevPixel);
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}
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}
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if (0 == actualRuleThickness) {
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// Rule 15c, App. G, TeXbook
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// min clearance between numerator and denominator
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nscoord minClearance = displayStyle ?
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7 * defaultRuleThickness : 3 * defaultRuleThickness;
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if (mathFont) {
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minClearance = mathFont->MathTable()->
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Constant(displayStyle ?
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gfxMathTable::StackDisplayStyleGapMin :
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gfxMathTable::StackGapMin,
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oneDevPixel);
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}
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// Factor in axis height
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// http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2
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numShift += axisHeight;
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denShift += axisHeight;
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nscoord actualClearance =
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(numShift - bmNum.descent) - (bmDen.ascent - denShift);
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// actualClearance should be >= minClearance
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if (actualClearance < minClearance) {
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nscoord halfGap = (minClearance - actualClearance)/2;
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numShift += halfGap;
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denShift += halfGap;
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}
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}
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else {
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// Rule 15d, App. G, TeXbook
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// min clearance between numerator or denominator and middle of bar
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// TeX has a different interpretation of the thickness.
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// Try $a \above10pt b$ to see. Here is what TeX does:
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// minClearance = displayStyle ?
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// 3 * actualRuleThickness : actualRuleThickness;
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// we slightly depart from TeX here. We use the defaultRuleThickness instead
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// of the value coming from the linethickness attribute, i.e., we recover what
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// TeX does if the user hasn't set linethickness. But when the linethickness
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// is set, we avoid the wide gap problem.
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nscoord minClearanceNum = displayStyle ?
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3 * defaultRuleThickness : defaultRuleThickness + onePixel;
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nscoord minClearanceDen = minClearanceNum;
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if (mathFont) {
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minClearanceNum = mathFont->
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MathTable()->Constant(displayStyle ?
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gfxMathTable::FractionNumDisplayStyleGapMin :
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gfxMathTable::FractionNumeratorGapMin,
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oneDevPixel);
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minClearanceDen = mathFont->
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MathTable()->Constant(displayStyle ?
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gfxMathTable::FractionDenomDisplayStyleGapMin :
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gfxMathTable::FractionDenominatorGapMin,
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oneDevPixel);
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}
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// adjust numShift to maintain minClearanceNum if needed
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nscoord actualClearanceNum =
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(numShift - bmNum.descent) - (axisHeight + actualRuleThickness/2);
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if (actualClearanceNum < minClearanceNum) {
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numShift += (minClearanceNum - actualClearanceNum);
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}
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// adjust denShift to maintain minClearanceDen if needed
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nscoord actualClearanceDen =
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(axisHeight - actualRuleThickness/2) - (bmDen.ascent - denShift);
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if (actualClearanceDen < minClearanceDen) {
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denShift += (minClearanceDen - actualClearanceDen);
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}
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}
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//////////////////
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// Place Children
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// XXX Need revisiting the width. TeX uses the exact width
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// e.g. in $$\huge\frac{\displaystyle\int}{i}$$
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nscoord width = std::max(bmNum.width, bmDen.width);
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nscoord dxNum = leftSpace + (width - sizeNum.Width())/2;
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nscoord dxDen = leftSpace + (width - sizeDen.Width())/2;
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width += leftSpace + rightSpace;
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// see if the numalign attribute is there
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::numalign_, value);
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if (value.EqualsLiteral("left"))
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dxNum = leftSpace;
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else if (value.EqualsLiteral("right"))
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dxNum = width - rightSpace - sizeNum.Width();
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// see if the denomalign attribute is there
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::denomalign_, value);
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if (value.EqualsLiteral("left"))
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dxDen = leftSpace;
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else if (value.EqualsLiteral("right"))
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dxDen = width - rightSpace - sizeDen.Width();
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mBoundingMetrics.rightBearing =
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std::max(dxNum + bmNum.rightBearing, dxDen + bmDen.rightBearing);
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if (mBoundingMetrics.rightBearing < width - rightSpace)
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mBoundingMetrics.rightBearing = width - rightSpace;
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mBoundingMetrics.leftBearing =
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std::min(dxNum + bmNum.leftBearing, dxDen + bmDen.leftBearing);
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if (mBoundingMetrics.leftBearing > leftSpace)
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mBoundingMetrics.leftBearing = leftSpace;
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mBoundingMetrics.ascent = bmNum.ascent + numShift;
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mBoundingMetrics.descent = bmDen.descent + denShift;
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mBoundingMetrics.width = width;
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aDesiredSize.SetBlockStartAscent(sizeNum.BlockStartAscent() + numShift);
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aDesiredSize.Height() = aDesiredSize.BlockStartAscent() +
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sizeDen.Height() - sizeDen.BlockStartAscent() + denShift;
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aDesiredSize.Width() = mBoundingMetrics.width;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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mReference.x = 0;
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mReference.y = aDesiredSize.BlockStartAscent();
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if (aPlaceOrigin) {
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nscoord dy;
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// place numerator
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dy = 0;
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FinishReflowChild(frameNum, presContext, sizeNum, nullptr, dxNum, dy, 0);
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// place denominator
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dy = aDesiredSize.Height() - sizeDen.Height();
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FinishReflowChild(frameDen, presContext, sizeDen, nullptr, dxDen, dy, 0);
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// place the fraction bar - dy is top of bar
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dy = aDesiredSize.BlockStartAscent() - (axisHeight + actualRuleThickness/2);
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mLineRect.SetRect(leftSpace, dy, width - (leftSpace + rightSpace),
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actualRuleThickness);
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}
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} else {
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nscoord numShift = 0.0;
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nscoord denShift = 0.0;
|
|
nscoord padding = 3 * defaultRuleThickness;
|
|
nscoord slashRatio = 3;
|
|
|
|
// Define the constant used in the expression of the maximum width
|
|
nscoord em = fm->EmHeight();
|
|
nscoord slashMaxWidthConstant = 2 * em;
|
|
|
|
// For large line thicknesses the minimum slash height is limited to the
|
|
// largest expected height of a fraction
|
|
nscoord slashMinHeight = slashRatio *
|
|
std::min(2 * mLineThickness, slashMaxWidthConstant);
|
|
|
|
nscoord leadingSpace = padding;
|
|
nscoord trailingSpace = padding;
|
|
if (outermostEmbellished) {
|
|
nsEmbellishData coreData;
|
|
GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData);
|
|
leadingSpace += coreData.leadingSpace;
|
|
trailingSpace += coreData.trailingSpace;
|
|
}
|
|
nscoord delta;
|
|
|
|
// ___________
|
|
// | | /
|
|
// {|-NUMERATOR-| /
|
|
// {|___________| S
|
|
// { L
|
|
// numShift{ A
|
|
// ------------------------------------------------------- baseline
|
|
// S _____________ } denShift
|
|
// H | |}
|
|
// / |-DENOMINATOR-|}
|
|
// / |_____________|
|
|
//
|
|
|
|
// first, ensure that the top of the numerator is at least as high as the
|
|
// top of the denominator (and the reverse for the bottoms)
|
|
delta = std::max(bmDen.ascent - bmNum.ascent,
|
|
bmNum.descent - bmDen.descent) / 2;
|
|
if (delta > 0) {
|
|
numShift += delta;
|
|
denShift += delta;
|
|
}
|
|
|
|
if (StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK) {
|
|
delta = std::min(bmDen.ascent + bmDen.descent,
|
|
bmNum.ascent + bmNum.descent) / 2;
|
|
numShift += delta;
|
|
denShift += delta;
|
|
} else {
|
|
nscoord xHeight = fm->XHeight();
|
|
numShift += xHeight / 2;
|
|
denShift += xHeight / 4;
|
|
}
|
|
|
|
// Set the ascent/descent of our BoundingMetrics.
|
|
mBoundingMetrics.ascent = bmNum.ascent + numShift;
|
|
mBoundingMetrics.descent = bmDen.descent + denShift;
|
|
|
|
// At this point the height of the slash is
|
|
// mBoundingMetrics.ascent + mBoundingMetrics.descent
|
|
// Ensure that it is greater than slashMinHeight
|
|
delta = (slashMinHeight -
|
|
(mBoundingMetrics.ascent + mBoundingMetrics.descent)) / 2;
|
|
if (delta > 0) {
|
|
mBoundingMetrics.ascent += delta;
|
|
mBoundingMetrics.descent += delta;
|
|
}
|
|
|
|
// Set the width of the slash
|
|
if (aWidthOnly) {
|
|
mLineRect.width = mLineThickness + slashMaxWidthConstant;
|
|
} else {
|
|
mLineRect.width = mLineThickness +
|
|
std::min(slashMaxWidthConstant,
|
|
(mBoundingMetrics.ascent + mBoundingMetrics.descent) /
|
|
slashRatio);
|
|
}
|
|
|
|
// Set horizontal bounding metrics
|
|
if (StyleVisibility()->mDirection) {
|
|
mBoundingMetrics.leftBearing = trailingSpace + bmDen.leftBearing;
|
|
mBoundingMetrics.rightBearing = trailingSpace + bmDen.width + mLineRect.width + bmNum.rightBearing;
|
|
} else {
|
|
mBoundingMetrics.leftBearing = leadingSpace + bmNum.leftBearing;
|
|
mBoundingMetrics.rightBearing = leadingSpace + bmNum.width + mLineRect.width + bmDen.rightBearing;
|
|
}
|
|
mBoundingMetrics.width =
|
|
leadingSpace + bmNum.width + mLineRect.width + bmDen.width +
|
|
trailingSpace;
|
|
|
|
// Set aDesiredSize
|
|
aDesiredSize.SetBlockStartAscent(mBoundingMetrics.ascent + padding);
|
|
aDesiredSize.Height() =
|
|
mBoundingMetrics.ascent + mBoundingMetrics.descent + 2 * padding;
|
|
aDesiredSize.Width() = mBoundingMetrics.width;
|
|
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
|
|
|
|
mReference.x = 0;
|
|
mReference.y = aDesiredSize.BlockStartAscent();
|
|
|
|
if (aPlaceOrigin) {
|
|
nscoord dx, dy;
|
|
|
|
// place numerator
|
|
dx = MirrorIfRTL(aDesiredSize.Width(), sizeNum.Width(),
|
|
leadingSpace);
|
|
dy = aDesiredSize.BlockStartAscent() - numShift - sizeNum.BlockStartAscent();
|
|
FinishReflowChild(frameNum, presContext, sizeNum, nullptr, dx, dy, 0);
|
|
|
|
// place the fraction bar
|
|
dx = MirrorIfRTL(aDesiredSize.Width(), mLineRect.width,
|
|
leadingSpace + bmNum.width);
|
|
dy = aDesiredSize.BlockStartAscent() - mBoundingMetrics.ascent;
|
|
mLineRect.SetRect(dx, dy,
|
|
mLineRect.width, aDesiredSize.Height() - 2 * padding);
|
|
|
|
// place denominator
|
|
dx = MirrorIfRTL(aDesiredSize.Width(), sizeDen.Width(),
|
|
leadingSpace + bmNum.width + mLineRect.width);
|
|
dy = aDesiredSize.BlockStartAscent() + denShift - sizeDen.BlockStartAscent();
|
|
FinishReflowChild(frameDen, presContext, sizeDen, nullptr, dx, dy, 0);
|
|
}
|
|
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
class nsDisplayMathMLSlash : public nsDisplayItem {
|
|
public:
|
|
nsDisplayMathMLSlash(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness, bool aRTL)
|
|
: nsDisplayItem(aBuilder, aFrame), mRect(aRect), mThickness(aThickness),
|
|
mRTL(aRTL) {
|
|
MOZ_COUNT_CTOR(nsDisplayMathMLSlash);
|
|
}
|
|
#ifdef NS_BUILD_REFCNT_LOGGING
|
|
virtual ~nsDisplayMathMLSlash() {
|
|
MOZ_COUNT_DTOR(nsDisplayMathMLSlash);
|
|
}
|
|
#endif
|
|
|
|
virtual void Paint(nsDisplayListBuilder* aBuilder,
|
|
nsRenderingContext* aCtx) override;
|
|
NS_DISPLAY_DECL_NAME("MathMLSlash", TYPE_MATHML_SLASH)
|
|
|
|
private:
|
|
nsRect mRect;
|
|
nscoord mThickness;
|
|
bool mRTL;
|
|
};
|
|
|
|
void nsDisplayMathMLSlash::Paint(nsDisplayListBuilder* aBuilder,
|
|
nsRenderingContext* aCtx)
|
|
{
|
|
DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
|
|
|
|
// get the gfxRect
|
|
nsPresContext* presContext = mFrame->PresContext();
|
|
Rect rect = NSRectToRect(mRect + ToReferenceFrame(),
|
|
presContext->AppUnitsPerDevPixel());
|
|
|
|
ColorPattern color(ToDeviceColor(
|
|
mFrame->GetVisitedDependentColor(eCSSProperty__webkit_text_fill_color)));
|
|
|
|
// draw the slash as a parallelogram
|
|
Point delta = Point(presContext->AppUnitsToGfxUnits(mThickness), 0);
|
|
RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
|
|
if (mRTL) {
|
|
builder->MoveTo(rect.TopLeft());
|
|
builder->LineTo(rect.TopLeft() + delta);
|
|
builder->LineTo(rect.BottomRight());
|
|
builder->LineTo(rect.BottomRight() - delta);
|
|
} else {
|
|
builder->MoveTo(rect.BottomLeft());
|
|
builder->LineTo(rect.BottomLeft() + delta);
|
|
builder->LineTo(rect.TopRight());
|
|
builder->LineTo(rect.TopRight() - delta);
|
|
}
|
|
RefPtr<Path> path = builder->Finish();
|
|
aDrawTarget.Fill(path, color);
|
|
}
|
|
|
|
void
|
|
nsMathMLmfracFrame::DisplaySlash(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame, const nsRect& aRect,
|
|
nscoord aThickness,
|
|
const nsDisplayListSet& aLists) {
|
|
if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty())
|
|
return;
|
|
|
|
aLists.Content()->AppendNewToTop(new (aBuilder)
|
|
nsDisplayMathMLSlash(aBuilder, aFrame, aRect, aThickness,
|
|
StyleVisibility()->mDirection));
|
|
}
|