428 lines
14 KiB
C++
428 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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#include "nsMathMLFrame.h"
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#include "gfxUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "nsLayoutUtils.h"
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#include "nsNameSpaceManager.h"
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#include "nsMathMLChar.h"
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#include "nsCSSPseudoElements.h"
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#include "nsMathMLElement.h"
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#include "gfxMathTable.h"
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// used to map attributes into CSS rules
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#include "mozilla/StyleSetHandle.h"
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#include "mozilla/StyleSetHandleInlines.h"
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#include "nsDisplayList.h"
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#include "nsRenderingContext.h"
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using namespace mozilla;
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using namespace mozilla::gfx;
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eMathMLFrameType
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nsMathMLFrame::GetMathMLFrameType()
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{
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// see if it is an embellished operator (mapped to 'Op' in TeX)
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if (mEmbellishData.coreFrame)
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return GetMathMLFrameTypeFor(mEmbellishData.coreFrame);
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// if it has a prescribed base, fetch the type from there
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if (mPresentationData.baseFrame)
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return GetMathMLFrameTypeFor(mPresentationData.baseFrame);
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// everything else is treated as ordinary (mapped to 'Ord' in TeX)
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return eMathMLFrameType_Ordinary;
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}
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NS_IMETHODIMP
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nsMathMLFrame::InheritAutomaticData(nsIFrame* aParent)
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{
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mEmbellishData.flags = 0;
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mEmbellishData.coreFrame = nullptr;
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mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
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mEmbellishData.leadingSpace = 0;
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mEmbellishData.trailingSpace = 0;
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mPresentationData.flags = 0;
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mPresentationData.baseFrame = nullptr;
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// by default, just inherit the display of our parent
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nsPresentationData parentData;
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GetPresentationDataFrom(aParent, parentData);
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#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
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mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS;
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#endif
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLFrame::UpdatePresentationData(uint32_t aFlagsValues,
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uint32_t aWhichFlags)
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{
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NS_ASSERTION(NS_MATHML_IS_COMPRESSED(aWhichFlags) ||
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NS_MATHML_IS_DTLS_SET(aWhichFlags),
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"aWhichFlags should only be compression or dtls flag");
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if (NS_MATHML_IS_COMPRESSED(aWhichFlags)) {
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// updating the compression flag is allowed
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if (NS_MATHML_IS_COMPRESSED(aFlagsValues)) {
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// 'compressed' means 'prime' style in App. G, TeXbook
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mPresentationData.flags |= NS_MATHML_COMPRESSED;
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}
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// no else. the flag is sticky. it retains its value once it is set
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}
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// These flags determine whether the dtls font feature settings should
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// be applied.
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if (NS_MATHML_IS_DTLS_SET(aWhichFlags)) {
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if (NS_MATHML_IS_DTLS_SET(aFlagsValues)) {
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mPresentationData.flags |= NS_MATHML_DTLS;
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} else {
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mPresentationData.flags &= ~NS_MATHML_DTLS;
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}
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}
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return NS_OK;
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}
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// Helper to give a style context suitable for doing the stretching of
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// a MathMLChar. Frame classes that use this should ensure that the
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// extra leaf style contexts given to the MathMLChars are accessible to
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// the Style System via the Get/Set AdditionalStyleContext() APIs.
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/* static */ void
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nsMathMLFrame::ResolveMathMLCharStyle(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsStyleContext* aParentStyleContext,
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nsMathMLChar* aMathMLChar)
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{
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CSSPseudoElementType pseudoType =
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CSSPseudoElementType::mozMathAnonymous; // savings
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RefPtr<nsStyleContext> newStyleContext;
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newStyleContext = aPresContext->StyleSet()->
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ResolvePseudoElementStyle(aContent->AsElement(), pseudoType,
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aParentStyleContext, nullptr);
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aMathMLChar->SetStyleContext(newStyleContext);
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}
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/* static */ void
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nsMathMLFrame::GetEmbellishDataFrom(nsIFrame* aFrame,
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nsEmbellishData& aEmbellishData)
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{
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// initialize OUT params
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aEmbellishData.flags = 0;
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aEmbellishData.coreFrame = nullptr;
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aEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
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aEmbellishData.leadingSpace = 0;
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aEmbellishData.trailingSpace = 0;
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if (aFrame && aFrame->IsFrameOfType(nsIFrame::eMathML)) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame);
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if (mathMLFrame) {
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mathMLFrame->GetEmbellishData(aEmbellishData);
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}
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}
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}
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// helper to get the presentation data of a frame, by possibly walking up
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// the frame hierarchy if we happen to be surrounded by non-MathML frames.
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/* static */ void
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nsMathMLFrame::GetPresentationDataFrom(nsIFrame* aFrame,
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nsPresentationData& aPresentationData,
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bool aClimbTree)
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{
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// initialize OUT params
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aPresentationData.flags = 0;
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aPresentationData.baseFrame = nullptr;
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nsIFrame* frame = aFrame;
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while (frame) {
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if (frame->IsFrameOfType(nsIFrame::eMathML)) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(frame);
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if (mathMLFrame) {
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mathMLFrame->GetPresentationData(aPresentationData);
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break;
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}
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}
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// stop if the caller doesn't want to lookup beyond the frame
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if (!aClimbTree) {
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break;
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}
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// stop if we reach the root <math> tag
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nsIContent* content = frame->GetContent();
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NS_ASSERTION(content || !frame->GetParent(), // no assert for the root
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"dangling frame without a content node");
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if (!content)
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break;
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if (content->IsMathMLElement(nsGkAtoms::math)) {
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break;
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}
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frame = frame->GetParent();
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}
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NS_WARNING_ASSERTION(
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frame && frame->GetContent(),
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"bad MathML markup - could not find the top <math> element");
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}
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/* static */ void
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nsMathMLFrame::GetRuleThickness(DrawTarget* aDrawTarget,
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nsFontMetrics* aFontMetrics,
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nscoord& aRuleThickness)
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{
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nscoord xHeight = aFontMetrics->XHeight();
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char16_t overBar = 0x00AF;
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nsBoundingMetrics bm =
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nsLayoutUtils::AppUnitBoundsOfString(&overBar, 1, *aFontMetrics,
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aDrawTarget);
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aRuleThickness = bm.ascent + bm.descent;
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if (aRuleThickness <= 0 || aRuleThickness >= xHeight) {
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// fall-back to the other version
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GetRuleThickness(aFontMetrics, aRuleThickness);
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}
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}
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/* static */ void
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nsMathMLFrame::GetAxisHeight(DrawTarget* aDrawTarget,
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nsFontMetrics* aFontMetrics,
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nscoord& aAxisHeight)
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{
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gfxFont* mathFont = aFontMetrics->GetThebesFontGroup()->GetFirstMathFont();
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if (mathFont) {
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aAxisHeight =
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mathFont->MathTable()->Constant(gfxMathTable::AxisHeight,
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aFontMetrics->AppUnitsPerDevPixel());
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return;
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}
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nscoord xHeight = aFontMetrics->XHeight();
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char16_t minus = 0x2212; // not '-', but official Unicode minus sign
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nsBoundingMetrics bm =
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nsLayoutUtils::AppUnitBoundsOfString(&minus, 1, *aFontMetrics, aDrawTarget);
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aAxisHeight = bm.ascent - (bm.ascent + bm.descent)/2;
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if (aAxisHeight <= 0 || aAxisHeight >= xHeight) {
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// fall-back to the other version
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GetAxisHeight(aFontMetrics, aAxisHeight);
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}
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}
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/* static */ nscoord
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nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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const nsCSSValue& aCSSValue,
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float aFontSizeInflation)
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{
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NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
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if (aCSSValue.IsFixedLengthUnit()) {
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return aCSSValue.GetFixedLength(aPresContext);
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}
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if (aCSSValue.IsPixelLengthUnit()) {
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return aCSSValue.GetPixelLength();
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}
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nsCSSUnit unit = aCSSValue.GetUnit();
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if (eCSSUnit_EM == unit) {
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const nsStyleFont* font = aStyleContext->StyleFont();
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return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
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}
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else if (eCSSUnit_XHeight == unit) {
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aPresContext->SetUsesExChUnits(true);
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RefPtr<nsFontMetrics> fm = nsLayoutUtils::
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GetFontMetricsForStyleContext(aStyleContext, aFontSizeInflation);
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nscoord xHeight = fm->XHeight();
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return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
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}
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// MathML doesn't specify other CSS units such as rem or ch
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NS_ERROR("Unsupported unit");
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return 0;
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}
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/* static */ void
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nsMathMLFrame::ParseNumericValue(const nsString& aString,
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nscoord* aLengthValue,
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uint32_t aFlags,
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nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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float aFontSizeInflation)
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{
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nsCSSValue cssValue;
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if (!nsMathMLElement::ParseNumericValue(aString, cssValue, aFlags,
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aPresContext->Document())) {
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// Invalid attribute value. aLengthValue remains unchanged, so the default
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// length value is used.
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return;
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}
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nsCSSUnit unit = cssValue.GetUnit();
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if (unit == eCSSUnit_Percent || unit == eCSSUnit_Number) {
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// Relative units. A multiple of the default length value is used.
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*aLengthValue = NSToCoordRound(*aLengthValue * (unit == eCSSUnit_Percent ?
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cssValue.GetPercentValue() :
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cssValue.GetFloatValue()));
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return;
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}
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// Absolute units.
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*aLengthValue = CalcLength(aPresContext, aStyleContext, cssValue,
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aFontSizeInflation);
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}
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// ================
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// Utils to map attributes into CSS rules (work-around to bug 69409 which
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// is not scheduled to be fixed anytime soon)
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//
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struct
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nsCSSMapping {
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int32_t compatibility;
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const nsIAtom* attrAtom;
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const char* cssProperty;
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};
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#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
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class nsDisplayMathMLBoundingMetrics : public nsDisplayItem {
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public:
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nsDisplayMathMLBoundingMetrics(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect)
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: nsDisplayItem(aBuilder, aFrame), mRect(aRect) {
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MOZ_COUNT_CTOR(nsDisplayMathMLBoundingMetrics);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayMathMLBoundingMetrics() {
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MOZ_COUNT_DTOR(nsDisplayMathMLBoundingMetrics);
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}
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#endif
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx) override;
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NS_DISPLAY_DECL_NAME("MathMLBoundingMetrics", TYPE_MATHML_BOUNDING_METRICS)
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private:
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nsRect mRect;
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};
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void nsDisplayMathMLBoundingMetrics::Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx)
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{
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DrawTarget* drawTarget = aCtx->GetDrawTarget();
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Rect r = NSRectToRect(mRect + ToReferenceFrame(),
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mFrame->PresContext()->AppUnitsPerDevPixel());
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ColorPattern blue(ToDeviceColor(Color(0.f, 0.f, 1.f, 1.f)));
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drawTarget->StrokeRect(r, blue);
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}
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void
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nsMathMLFrame::DisplayBoundingMetrics(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsPoint& aPt,
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const nsBoundingMetrics& aMetrics,
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const nsDisplayListSet& aLists) {
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if (!NS_MATHML_PAINT_BOUNDING_METRICS(mPresentationData.flags))
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return;
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nscoord x = aPt.x + aMetrics.leftBearing;
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nscoord y = aPt.y - aMetrics.ascent;
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nscoord w = aMetrics.rightBearing - aMetrics.leftBearing;
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nscoord h = aMetrics.ascent + aMetrics.descent;
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aLists.Content()->AppendNewToTop(new (aBuilder)
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nsDisplayMathMLBoundingMetrics(aBuilder, aFrame, nsRect(x,y,w,h)));
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}
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#endif
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class nsDisplayMathMLBar : public nsDisplayItem {
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public:
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nsDisplayMathMLBar(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect)
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: nsDisplayItem(aBuilder, aFrame), mRect(aRect) {
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MOZ_COUNT_CTOR(nsDisplayMathMLBar);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayMathMLBar() {
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MOZ_COUNT_DTOR(nsDisplayMathMLBar);
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}
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#endif
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx) override;
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NS_DISPLAY_DECL_NAME("MathMLBar", TYPE_MATHML_BAR)
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private:
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nsRect mRect;
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};
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void nsDisplayMathMLBar::Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx)
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{
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// paint the bar with the current text color
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DrawTarget* drawTarget = aCtx->GetDrawTarget();
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Rect rect =
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NSRectToNonEmptySnappedRect(mRect + ToReferenceFrame(),
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mFrame->PresContext()->AppUnitsPerDevPixel(),
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*drawTarget);
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ColorPattern color(ToDeviceColor(
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mFrame->GetVisitedDependentColor(eCSSProperty__webkit_text_fill_color)));
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drawTarget->FillRect(rect, color);
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}
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void
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nsMathMLFrame::DisplayBar(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect,
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const nsDisplayListSet& aLists) {
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if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty())
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return;
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aLists.Content()->AppendNewToTop(new (aBuilder)
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nsDisplayMathMLBar(aBuilder, aFrame, aRect));
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}
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void
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nsMathMLFrame::GetRadicalParameters(nsFontMetrics* aFontMetrics,
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bool aDisplayStyle,
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nscoord& aRadicalRuleThickness,
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nscoord& aRadicalExtraAscender,
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nscoord& aRadicalVerticalGap)
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{
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nscoord oneDevPixel = aFontMetrics->AppUnitsPerDevPixel();
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gfxFont* mathFont = aFontMetrics->GetThebesFontGroup()->GetFirstMathFont();
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// get the radical rulethickness
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if (mathFont) {
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aRadicalRuleThickness = mathFont->MathTable()->
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Constant(gfxMathTable::RadicalRuleThickness, oneDevPixel);
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} else {
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GetRuleThickness(aFontMetrics, aRadicalRuleThickness);
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}
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// get the leading to be left at the top of the resulting frame
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if (mathFont) {
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aRadicalExtraAscender = mathFont->MathTable()->
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Constant(gfxMathTable::RadicalExtraAscender, oneDevPixel);
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} else {
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// This seems more reliable than using aFontMetrics->GetLeading() on
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// suspicious fonts.
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nscoord em;
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GetEmHeight(aFontMetrics, em);
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aRadicalExtraAscender = nscoord(0.2f * em);
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}
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// get the clearance between rule and content
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if (mathFont) {
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aRadicalVerticalGap = mathFont->MathTable()->
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Constant(aDisplayStyle ?
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gfxMathTable::RadicalDisplayStyleVerticalGap :
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gfxMathTable::RadicalVerticalGap,
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oneDevPixel);
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} else {
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// Rule 11, App. G, TeXbook
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aRadicalVerticalGap = aRadicalRuleThickness +
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(aDisplayStyle ? aFontMetrics->XHeight() : aRadicalRuleThickness) / 4;
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}
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}
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