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https://gitlab.winehq.org/wine/wine-gecko.git
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4bfe3c39fd
Backed out changeset e2ab653f688a (bug 1008917) Backed out changeset b52154d8d900 (bug 1008917) Backed out changeset 2ab5b01da4de (bug 1008917) Backed out changeset f7a38df1d44f (bug 1008917) Backed out changeset 80304bb9a572 (bug 1008917) Backed out changeset 10ed89a302e9 (bug 1008917) Backed out changeset 161c41991d46 (bug 1008917) Backed out changeset 25b2475d2368 (bug 1008917) Backed out changeset b8000b31277c (bug 1008917) Backed out changeset 9afa5e7715e1 (bug 1008917) Backed out changeset 5c380c21351f (bug 1008917)
414 lines
15 KiB
C++
414 lines
15 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 "nsMathMLmrootFrame.h"
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#include "nsPresContext.h"
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#include "nsRenderingContext.h"
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#include <algorithm>
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//
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// <msqrt> and <mroot> -- form a radical - implementation
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//
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//NOTE:
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// The code assumes that TeX fonts are picked.
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// There is no fall-back to draw the branches of the sqrt explicitly
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// in the case where TeX fonts are not there. In general, there are no
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// fall-back(s) in MathML when some (freely-downloadable) fonts are missing.
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// Otherwise, this will add much work and unnecessary complexity to the core
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// MathML engine. Assuming that authors have the free fonts is part of the
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// deal. We are not responsible for cases of misconfigurations out there.
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// additional style context to be used by our MathMLChar.
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#define NS_SQR_CHAR_STYLE_CONTEXT_INDEX 0
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static const char16_t kSqrChar = char16_t(0x221A);
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nsIFrame*
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NS_NewMathMLmrootFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmrootFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmrootFrame)
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nsMathMLmrootFrame::nsMathMLmrootFrame(nsStyleContext* aContext) :
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nsMathMLContainerFrame(aContext),
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mSqrChar(),
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mBarRect()
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{
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}
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nsMathMLmrootFrame::~nsMathMLmrootFrame()
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{
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}
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void
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nsMathMLmrootFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
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nsPresContext *presContext = PresContext();
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// No need to track the style context given to our MathML char.
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// The Style System will use Get/SetAdditionalStyleContext() to keep it
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// up-to-date if dynamic changes arise.
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nsAutoString sqrChar; sqrChar.Assign(kSqrChar);
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mSqrChar.SetData(presContext, sqrChar);
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ResolveMathMLCharStyle(presContext, mContent, mStyleContext, &mSqrChar);
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}
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NS_IMETHODIMP
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nsMathMLmrootFrame::TransmitAutomaticData()
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{
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// 1. The REC says:
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// The <mroot> element increments scriptlevel by 2, and sets displaystyle to
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// "false", within index, but leaves both attributes unchanged within base.
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// 2. The TeXbook (Ch 17. p.141) says \sqrt 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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UpdatePresentationDataFromChildAt(0, 0,
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NS_MATHML_COMPRESSED, NS_MATHML_COMPRESSED);
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PropagateFrameFlagFor(mFrames.LastChild(),
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NS_FRAME_MATHML_SCRIPT_DESCENDANT);
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return NS_OK;
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}
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void
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nsMathMLmrootFrame::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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/////////////
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// paint the content we are square-rooting
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nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
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/////////////
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// paint the sqrt symbol
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if (!NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
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mSqrChar.Display(aBuilder, this, aLists, 0);
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DisplayBar(aBuilder, this, mBarRect, aLists);
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#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
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// for visual debug
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nsRect rect;
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mSqrChar.GetRect(rect);
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nsBoundingMetrics bm;
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mSqrChar.GetBoundingMetrics(bm);
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DisplayBoundingMetrics(aBuilder, this, rect.TopLeft(), bm, aLists);
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#endif
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}
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}
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static void
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GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,
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nsFontMetrics* aFontMetrics,
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nscoord* aIndexOffset, nscoord* aSqrOffset)
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{
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// The index is tucked in closer to the radical while making sure
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// that the kern does not make the index and radical collide
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nscoord dxIndex, dxSqr;
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nscoord xHeight = aFontMetrics->XHeight();
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nscoord indexRadicalKern = NSToCoordRound(1.35f * xHeight);
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if (indexRadicalKern > aIndexWidth) {
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dxIndex = indexRadicalKern - aIndexWidth;
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dxSqr = 0;
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}
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else {
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dxIndex = 0;
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dxSqr = aIndexWidth - indexRadicalKern;
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}
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// avoid collision by leaving a minimum space between index and radical
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nscoord minimumClearance = aSqrWidth/2;
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if (dxIndex + aIndexWidth + minimumClearance > dxSqr + aSqrWidth) {
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if (aIndexWidth + minimumClearance < aSqrWidth) {
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dxIndex = aSqrWidth - (aIndexWidth + minimumClearance);
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dxSqr = 0;
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}
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else {
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dxIndex = 0;
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dxSqr = (aIndexWidth + minimumClearance) - aSqrWidth;
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}
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}
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if (aIndexOffset)
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*aIndexOffset = dxIndex;
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if (aSqrOffset)
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*aSqrOffset = dxSqr;
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}
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nsresult
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nsMathMLmrootFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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nsresult rv = NS_OK;
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nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
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nsReflowStatus childStatus;
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aDesiredSize.Width() = aDesiredSize.Height() = 0;
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aDesiredSize.SetTopAscent(0);
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nsBoundingMetrics bmSqr, bmBase, bmIndex;
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nsRenderingContext& renderingContext = *aReflowState.rendContext;
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//////////////////
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// Reflow Children
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int32_t count = 0;
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nsIFrame* baseFrame = nullptr;
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nsIFrame* indexFrame = nullptr;
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nsHTMLReflowMetrics baseSize(aReflowState);
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nsHTMLReflowMetrics indexSize(aReflowState);
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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// ask our children to compute their bounding metrics
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nsHTMLReflowMetrics childDesiredSize(aReflowState,
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aDesiredSize.mFlags
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| NS_REFLOW_CALC_BOUNDING_METRICS);
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nsHTMLReflowState childReflowState(aPresContext, aReflowState,
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childFrame, availSize);
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rv = ReflowChild(childFrame, aPresContext,
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childDesiredSize, childReflowState, childStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
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if (NS_FAILED(rv)) {
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// Call DidReflow() for the child frames we successfully did reflow.
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DidReflowChildren(mFrames.FirstChild(), childFrame);
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return rv;
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}
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if (0 == count) {
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// base
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baseFrame = childFrame;
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baseSize = childDesiredSize;
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bmBase = childDesiredSize.mBoundingMetrics;
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}
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else if (1 == count) {
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// index
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indexFrame = childFrame;
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indexSize = childDesiredSize;
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bmIndex = childDesiredSize.mBoundingMetrics;
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}
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count++;
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childFrame = childFrame->GetNextSibling();
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}
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if (2 != count) {
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// report an error, encourage people to get their markups in order
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ReportChildCountError();
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rv = ReflowError(renderingContext, aDesiredSize);
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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// Call DidReflow() for the child frames we successfully did reflow.
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DidReflowChildren(mFrames.FirstChild(), childFrame);
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return rv;
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}
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////////////
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// Prepare the radical symbol and the overline bar
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
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renderingContext.SetFont(fm);
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// For radical glyphs from TeX fonts and some of the radical glyphs from
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// Mathematica fonts, the thickness of the overline can be obtained from the
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// ascent of the glyph. Most fonts however have radical glyphs above the
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// baseline so no assumption can be made about the meaning of the ascent.
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nscoord ruleThickness, leading, em;
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GetRuleThickness(renderingContext, fm, ruleThickness);
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char16_t one = '1';
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nsBoundingMetrics bmOne = renderingContext.GetBoundingMetrics(&one, 1);
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// get the leading to be left at the top of the resulting frame
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// this seems more reliable than using fm->GetLeading() on suspicious fonts
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GetEmHeight(fm, em);
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leading = nscoord(0.2f * em);
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// Rule 11, App. G, TeXbook
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// psi = clearance between rule and content
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nscoord phi = 0, psi = 0;
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if (StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK)
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phi = fm->XHeight();
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else
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phi = ruleThickness;
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psi = ruleThickness + phi/4;
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// built-in: adjust clearance psi to emulate \mathstrut using '1' (TexBook, p.131)
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if (bmOne.ascent > bmBase.ascent)
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psi += bmOne.ascent - bmBase.ascent;
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// make sure that the rule appears on on screen
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nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
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if (ruleThickness < onePixel) {
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ruleThickness = onePixel;
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}
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// adjust clearance psi to get an exact number of pixels -- this
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// gives a nicer & uniform look on stacked radicals (bug 130282)
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nscoord delta = psi % onePixel;
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if (delta)
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psi += onePixel - delta; // round up
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// Stretch the radical symbol to the appropriate height if it is not big enough.
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nsBoundingMetrics contSize = bmBase;
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contSize.descent = bmBase.ascent + bmBase.descent + psi;
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contSize.ascent = ruleThickness;
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// height(radical) should be >= height(base) + psi + ruleThickness
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nsBoundingMetrics radicalSize;
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mSqrChar.Stretch(aPresContext, renderingContext,
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NS_STRETCH_DIRECTION_VERTICAL,
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contSize, radicalSize,
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NS_STRETCH_LARGER,
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StyleVisibility()->mDirection);
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// radicalSize have changed at this point, and should match with
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// the bounding metrics of the char
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mSqrChar.GetBoundingMetrics(bmSqr);
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// Update the desired size for the container (like msqrt, index is not yet included)
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// the baseline will be that of the base.
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mBoundingMetrics.ascent = bmBase.ascent + psi + ruleThickness;
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mBoundingMetrics.descent =
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std::max(bmBase.descent,
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(bmSqr.ascent + bmSqr.descent - mBoundingMetrics.ascent));
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mBoundingMetrics.width = bmSqr.width + bmBase.width;
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mBoundingMetrics.leftBearing = bmSqr.leftBearing;
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mBoundingMetrics.rightBearing = bmSqr.width +
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std::max(bmBase.width, bmBase.rightBearing); // take also care of the rule
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aDesiredSize.SetTopAscent(mBoundingMetrics.ascent + leading);
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aDesiredSize.Height() = aDesiredSize.TopAscent() +
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std::max(baseSize.Height() - baseSize.TopAscent(),
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mBoundingMetrics.descent + ruleThickness);
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aDesiredSize.Width() = mBoundingMetrics.width;
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/////////////
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// Re-adjust the desired size to include the index.
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// the index is raised by some fraction of the height
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// of the radical, see \mroot macro in App. B, TexBook
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nscoord raiseIndexDelta = NSToCoordRound(0.6f * (bmSqr.ascent + bmSqr.descent));
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nscoord indexRaisedAscent = mBoundingMetrics.ascent // top of radical
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- (bmSqr.ascent + bmSqr.descent) // to bottom of radical
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+ raiseIndexDelta + bmIndex.ascent + bmIndex.descent; // to top of raised index
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nscoord indexClearance = 0;
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if (mBoundingMetrics.ascent < indexRaisedAscent) {
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indexClearance =
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indexRaisedAscent - mBoundingMetrics.ascent; // excess gap introduced by a tall index
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mBoundingMetrics.ascent = indexRaisedAscent;
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nscoord descent = aDesiredSize.Height() - aDesiredSize.TopAscent();
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aDesiredSize.SetTopAscent(mBoundingMetrics.ascent + leading);
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aDesiredSize.Height() = aDesiredSize.TopAscent() + descent;
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}
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nscoord dxIndex, dxSqr;
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GetRadicalXOffsets(bmIndex.width, bmSqr.width, fm, &dxIndex, &dxSqr);
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mBoundingMetrics.width = dxSqr + bmSqr.width + bmBase.width;
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mBoundingMetrics.leftBearing =
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std::min(dxIndex + bmIndex.leftBearing, dxSqr + bmSqr.leftBearing);
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mBoundingMetrics.rightBearing = dxSqr + bmSqr.width +
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std::max(bmBase.width, bmBase.rightBearing);
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aDesiredSize.Width() = mBoundingMetrics.width;
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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GatherAndStoreOverflow(&aDesiredSize);
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// place the index
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nscoord dx = dxIndex;
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nscoord dy = aDesiredSize.TopAscent() - (indexRaisedAscent + indexSize.TopAscent() - bmIndex.ascent);
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FinishReflowChild(indexFrame, aPresContext, indexSize, nullptr,
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MirrorIfRTL(aDesiredSize.Width(), indexSize.Width(), dx),
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dy, 0);
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// place the radical symbol and the radical bar
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dx = dxSqr;
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dy = indexClearance + leading; // leave a leading at the top
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mSqrChar.SetRect(nsRect(MirrorIfRTL(aDesiredSize.Width(), bmSqr.width, dx),
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dy, bmSqr.width, bmSqr.ascent + bmSqr.descent));
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dx += bmSqr.width;
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mBarRect.SetRect(MirrorIfRTL(aDesiredSize.Width(), bmBase.width, dx),
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dy, bmBase.width, ruleThickness);
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// place the base
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dy = aDesiredSize.TopAscent() - baseSize.TopAscent();
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FinishReflowChild(baseFrame, aPresContext, baseSize, nullptr,
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MirrorIfRTL(aDesiredSize.Width(), baseSize.Width(), dx),
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dy, 0);
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mReference.x = 0;
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mReference.y = aDesiredSize.TopAscent();
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
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}
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/* virtual */ void
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nsMathMLmrootFrame::GetIntrinsicWidthMetrics(nsRenderingContext* aRenderingContext, nsHTMLReflowMetrics& aDesiredSize)
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{
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nsIFrame* baseFrame = mFrames.FirstChild();
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nsIFrame* indexFrame = nullptr;
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if (baseFrame)
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indexFrame = baseFrame->GetNextSibling();
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if (!indexFrame || indexFrame->GetNextSibling()) {
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ReflowError(*aRenderingContext, aDesiredSize);
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return;
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}
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nscoord baseWidth =
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nsLayoutUtils::IntrinsicForContainer(aRenderingContext, baseFrame,
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nsLayoutUtils::PREF_WIDTH);
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nscoord indexWidth =
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nsLayoutUtils::IntrinsicForContainer(aRenderingContext, indexFrame,
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nsLayoutUtils::PREF_WIDTH);
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nscoord sqrWidth = mSqrChar.GetMaxWidth(PresContext(), *aRenderingContext);
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nscoord dxSqr;
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
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GetRadicalXOffsets(indexWidth, sqrWidth, fm, nullptr, &dxSqr);
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nscoord width = dxSqr + sqrWidth + baseWidth;
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aDesiredSize.Width() = width;
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aDesiredSize.mBoundingMetrics.width = width;
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aDesiredSize.mBoundingMetrics.leftBearing = 0;
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aDesiredSize.mBoundingMetrics.rightBearing = width;
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}
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// ----------------------
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// the Style System will use these to pass the proper style context to our MathMLChar
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nsStyleContext*
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nsMathMLmrootFrame::GetAdditionalStyleContext(int32_t aIndex) const
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{
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switch (aIndex) {
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case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
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return mSqrChar.GetStyleContext();
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break;
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default:
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return nullptr;
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}
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}
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void
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nsMathMLmrootFrame::SetAdditionalStyleContext(int32_t aIndex,
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nsStyleContext* aStyleContext)
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{
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switch (aIndex) {
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case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
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mSqrChar.SetStyleContext(aStyleContext);
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break;
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}
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}
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