5379 lines
183 KiB
C++
5379 lines
183 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Main header first:
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#include "SVGTextFrame.h"
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// Keep others in (case-insensitive) order:
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#include "DOMSVGPoint.h"
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#include "gfx2DGlue.h"
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#include "gfxContext.h"
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#include "gfxFont.h"
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#include "gfxSkipChars.h"
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#include "gfxTypes.h"
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#include "gfxUtils.h"
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#include "LookAndFeel.h"
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#include "nsBidiPresUtils.h"
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#include "nsBlockFrame.h"
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#include "nsCaret.h"
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#include "nsContentUtils.h"
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#include "nsGkAtoms.h"
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#include "SVGPaintServerFrame.h"
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#include "nsTArray.h"
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#include "nsTextFrame.h"
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#include "SVGAnimatedNumberList.h"
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#include "SVGContentUtils.h"
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#include "SVGContextPaint.h"
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#include "SVGLengthList.h"
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#include "SVGNumberList.h"
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#include "nsLayoutUtils.h"
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#include "nsFrameSelection.h"
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#include "nsStyleStructInlines.h"
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#include "mozilla/CaretAssociationHint.h"
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#include "mozilla/DisplaySVGItem.h"
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#include "mozilla/Likely.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/SVGObserverUtils.h"
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#include "mozilla/SVGOuterSVGFrame.h"
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#include "mozilla/SVGUtils.h"
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#include "mozilla/dom/DOMPointBinding.h"
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#include "mozilla/dom/Selection.h"
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#include "mozilla/dom/SVGGeometryElement.h"
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#include "mozilla/dom/SVGRect.h"
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#include "mozilla/dom/SVGTextContentElementBinding.h"
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#include "mozilla/dom/SVGTextPathElement.h"
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#include "mozilla/dom/Text.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/PatternHelpers.h"
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#include <algorithm>
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#include <cmath>
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#include <limits>
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using namespace mozilla::dom;
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using namespace mozilla::dom::SVGTextContentElement_Binding;
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using namespace mozilla::gfx;
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using namespace mozilla::image;
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namespace mozilla {
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// ============================================================================
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// Utility functions
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/**
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* Using the specified gfxSkipCharsIterator, converts an offset and length
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* in original char indexes to skipped char indexes.
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*
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* @param aIterator The gfxSkipCharsIterator to use for the conversion.
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* @param aOriginalOffset The original offset.
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* @param aOriginalLength The original length.
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*/
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static gfxTextRun::Range ConvertOriginalToSkipped(
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gfxSkipCharsIterator& aIterator, uint32_t aOriginalOffset,
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uint32_t aOriginalLength) {
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uint32_t start = aIterator.ConvertOriginalToSkipped(aOriginalOffset);
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aIterator.AdvanceOriginal(aOriginalLength);
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return gfxTextRun::Range(start, aIterator.GetSkippedOffset());
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}
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/**
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* Converts an nsPoint from app units to user space units using the specified
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* nsPresContext and returns it as a gfxPoint.
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*/
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static gfxPoint AppUnitsToGfxUnits(const nsPoint& aPoint,
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const nsPresContext* aContext) {
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return gfxPoint(aContext->AppUnitsToGfxUnits(aPoint.x),
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aContext->AppUnitsToGfxUnits(aPoint.y));
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}
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/**
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* Converts a gfxRect that is in app units to CSS pixels using the specified
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* nsPresContext and returns it as a gfxRect.
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*/
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static gfxRect AppUnitsToFloatCSSPixels(const gfxRect& aRect,
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const nsPresContext* aContext) {
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return gfxRect(nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
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nsPresContext::AppUnitsToFloatCSSPixels(aRect.y),
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nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
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nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
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}
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/**
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* Returns whether a gfxPoint lies within a gfxRect.
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*/
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static bool Inside(const gfxRect& aRect, const gfxPoint& aPoint) {
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return aPoint.x >= aRect.x && aPoint.x < aRect.XMost() &&
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aPoint.y >= aRect.y && aPoint.y < aRect.YMost();
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}
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/**
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* Gets the measured ascent and descent of the text in the given nsTextFrame
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* in app units.
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*
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* @param aFrame The text frame.
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* @param aAscent The ascent in app units (output).
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* @param aDescent The descent in app units (output).
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*/
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static void GetAscentAndDescentInAppUnits(nsTextFrame* aFrame,
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gfxFloat& aAscent,
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gfxFloat& aDescent) {
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gfxSkipCharsIterator it = aFrame->EnsureTextRun(nsTextFrame::eInflated);
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gfxTextRun* textRun = aFrame->GetTextRun(nsTextFrame::eInflated);
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gfxTextRun::Range range = ConvertOriginalToSkipped(
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it, aFrame->GetContentOffset(), aFrame->GetContentLength());
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textRun->GetLineHeightMetrics(range, aAscent, aDescent);
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}
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/**
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* Updates an interval by intersecting it with another interval.
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* The intervals are specified using a start index and a length.
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*/
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static void IntersectInterval(uint32_t& aStart, uint32_t& aLength,
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uint32_t aStartOther, uint32_t aLengthOther) {
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uint32_t aEnd = aStart + aLength;
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uint32_t aEndOther = aStartOther + aLengthOther;
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if (aStartOther >= aEnd || aStart >= aEndOther) {
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aLength = 0;
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} else {
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if (aStartOther >= aStart) {
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aStart = aStartOther;
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}
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aLength = std::min(aEnd, aEndOther) - aStart;
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}
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}
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/**
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* Intersects an interval as IntersectInterval does but by taking
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* the offset and length of the other interval from a
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* nsTextFrame::TrimmedOffsets object.
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*/
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static void TrimOffsets(uint32_t& aStart, uint32_t& aLength,
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const nsTextFrame::TrimmedOffsets& aTrimmedOffsets) {
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IntersectInterval(aStart, aLength, aTrimmedOffsets.mStart,
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aTrimmedOffsets.mLength);
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}
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/**
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* Returns the closest ancestor-or-self node that is not an SVG <a>
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* element.
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*/
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static nsIContent* GetFirstNonAAncestor(nsIContent* aContent) {
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while (aContent && aContent->IsSVGElement(nsGkAtoms::a)) {
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aContent = aContent->GetParent();
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}
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return aContent;
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}
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/**
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* Returns whether the given node is a text content element[1], taking into
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* account whether it has a valid parent.
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*
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* For example, in:
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*
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* <svg xmlns="http://www.w3.org/2000/svg">
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* <text><a/><text/></text>
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* <tspan/>
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* </svg>
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*
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* true would be returned for the outer <text> element and the <a> element,
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* and false for the inner <text> element (since a <text> is not allowed
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* to be a child of another <text>) and the <tspan> element (because it
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* must be inside a <text> subtree).
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*
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* Note that we don't support the <tref> element yet and this function
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* returns false for it.
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*
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* [1] https://svgwg.org/svg2-draft/intro.html#TermTextContentElement
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*/
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static bool IsTextContentElement(nsIContent* aContent) {
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if (aContent->IsSVGElement(nsGkAtoms::text)) {
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nsIContent* parent = GetFirstNonAAncestor(aContent->GetParent());
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return !parent || !IsTextContentElement(parent);
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}
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if (aContent->IsSVGElement(nsGkAtoms::textPath)) {
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nsIContent* parent = GetFirstNonAAncestor(aContent->GetParent());
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return parent && parent->IsSVGElement(nsGkAtoms::text);
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}
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return aContent->IsAnyOfSVGElements(nsGkAtoms::a, nsGkAtoms::tspan);
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}
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/**
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* Returns whether the specified frame is an nsTextFrame that has some text
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* content.
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*/
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static bool IsNonEmptyTextFrame(nsIFrame* aFrame) {
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nsTextFrame* textFrame = do_QueryFrame(aFrame);
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if (!textFrame) {
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return false;
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}
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return textFrame->GetContentLength() != 0;
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}
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/**
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* Takes an nsIFrame and if it is a text frame that has some text content,
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* returns it as an nsTextFrame and its corresponding Text.
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*
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* @param aFrame The frame to look at.
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* @param aTextFrame aFrame as an nsTextFrame (output).
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* @param aTextNode The Text content of aFrame (output).
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* @return true if aFrame is a non-empty text frame, false otherwise.
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*/
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static bool GetNonEmptyTextFrameAndNode(nsIFrame* aFrame,
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nsTextFrame*& aTextFrame,
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Text*& aTextNode) {
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nsTextFrame* text = do_QueryFrame(aFrame);
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bool isNonEmptyTextFrame = text && text->GetContentLength() != 0;
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if (isNonEmptyTextFrame) {
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nsIContent* content = text->GetContent();
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NS_ASSERTION(content && content->IsText(),
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"unexpected content type for nsTextFrame");
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Text* node = content->AsText();
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MOZ_ASSERT(node->TextLength() != 0,
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"frame's GetContentLength() should be 0 if the text node "
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"has no content");
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aTextFrame = text;
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aTextNode = node;
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}
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MOZ_ASSERT(IsNonEmptyTextFrame(aFrame) == isNonEmptyTextFrame,
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"our logic should agree with IsNonEmptyTextFrame");
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return isNonEmptyTextFrame;
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}
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/**
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* Returns whether the specified atom is for one of the five
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* glyph positioning attributes that can appear on SVG text
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* elements -- x, y, dx, dy or rotate.
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*/
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static bool IsGlyphPositioningAttribute(nsAtom* aAttribute) {
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return aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y ||
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aAttribute == nsGkAtoms::dx || aAttribute == nsGkAtoms::dy ||
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aAttribute == nsGkAtoms::rotate;
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}
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/**
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* Returns the position in app units of a given baseline (using an
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* SVG dominant-baseline property value) for a given nsTextFrame.
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*
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* @param aFrame The text frame to inspect.
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* @param aTextRun The text run of aFrame.
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* @param aDominantBaseline The dominant-baseline value to use.
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*/
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static nscoord GetBaselinePosition(nsTextFrame* aFrame, gfxTextRun* aTextRun,
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StyleDominantBaseline aDominantBaseline,
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float aFontSizeScaleFactor) {
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WritingMode writingMode = aFrame->GetWritingMode();
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gfxFloat ascent, descent;
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aTextRun->GetLineHeightMetrics(ascent, descent);
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auto convertIfVerticalRL = [&](gfxFloat dominantBaseline) {
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return writingMode.IsVerticalRL() ? ascent + descent - dominantBaseline
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: dominantBaseline;
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};
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switch (aDominantBaseline) {
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case StyleDominantBaseline::Hanging:
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return convertIfVerticalRL(ascent * 0.2);
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case StyleDominantBaseline::TextBeforeEdge:
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return convertIfVerticalRL(0);
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case StyleDominantBaseline::Alphabetic:
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return writingMode.IsVerticalRL()
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? ascent * 0.5
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: aFrame->GetLogicalBaseline(writingMode);
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case StyleDominantBaseline::Auto:
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return convertIfVerticalRL(aFrame->GetLogicalBaseline(writingMode));
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case StyleDominantBaseline::Middle:
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return convertIfVerticalRL(aFrame->GetLogicalBaseline(writingMode) -
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SVGContentUtils::GetFontXHeight(aFrame) / 2.0 *
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AppUnitsPerCSSPixel() *
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aFontSizeScaleFactor);
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case StyleDominantBaseline::TextAfterEdge:
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case StyleDominantBaseline::Ideographic:
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return writingMode.IsVerticalLR() ? 0 : ascent + descent;
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case StyleDominantBaseline::Central:
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return (ascent + descent) / 2.0;
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case StyleDominantBaseline::Mathematical:
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return convertIfVerticalRL(ascent / 2.0);
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}
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MOZ_ASSERT_UNREACHABLE("unexpected dominant-baseline value");
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return convertIfVerticalRL(aFrame->GetLogicalBaseline(writingMode));
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}
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/**
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* Truncates an array to be at most the length of another array.
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*
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* @param aArrayToTruncate The array to truncate.
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* @param aReferenceArray The array whose length will be used to truncate
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* aArrayToTruncate to.
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*/
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template <typename T, typename U>
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static void TruncateTo(nsTArray<T>& aArrayToTruncate,
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const nsTArray<U>& aReferenceArray) {
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uint32_t length = aReferenceArray.Length();
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if (aArrayToTruncate.Length() > length) {
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aArrayToTruncate.TruncateLength(length);
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}
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}
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/**
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* Asserts that the anonymous block child of the SVGTextFrame has been
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* reflowed (or does not exist). Returns null if the child has not been
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* reflowed, and the frame otherwise.
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*
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* We check whether the kid has been reflowed and not the frame itself
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* since we sometimes need to call this function during reflow, after the
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* kid has been reflowed but before we have cleared the dirty bits on the
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* frame itself.
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*/
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static SVGTextFrame* FrameIfAnonymousChildReflowed(SVGTextFrame* aFrame) {
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MOZ_ASSERT(aFrame, "aFrame must not be null");
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nsIFrame* kid = aFrame->PrincipalChildList().FirstChild();
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if (kid->IsSubtreeDirty()) {
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MOZ_ASSERT(false, "should have already reflowed the anonymous block child");
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return nullptr;
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}
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return aFrame;
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}
|
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|
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// FIXME(emilio): SVG is a special-case where transforms affect layout. We don't
|
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// want that to go outside the SVG stuff (and really we should aim to remove
|
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// that).
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static float GetContextScale(SVGTextFrame* aFrame) {
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if (aFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
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// When we are non-display, we could be painted in different coordinate
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// spaces, and we don't want to have to reflow for each of these. We just
|
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// assume that the context scale is 1.0 for them all, so we don't get stuck
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// with a font size scale factor based on whichever referencing frame
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// happens to reflow first.
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return 1.0f;
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}
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auto matrix = nsLayoutUtils::GetTransformToAncestor(
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RelativeTo{aFrame}, RelativeTo{SVGUtils::GetOuterSVGFrame(aFrame)});
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Matrix transform2D;
|
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if (!matrix.CanDraw2D(&transform2D)) {
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return 1.0f;
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}
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auto scales = transform2D.ScaleFactors();
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return std::max(0.0f, std::max(scales.xScale, scales.yScale));
|
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}
|
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|
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// ============================================================================
|
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// Utility classes
|
||
|
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// ----------------------------------------------------------------------------
|
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// TextRenderedRun
|
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|
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/**
|
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* A run of text within a single nsTextFrame whose glyphs can all be painted
|
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* with a single call to nsTextFrame::PaintText. A text rendered run can
|
||
* be created for a sequence of two or more consecutive glyphs as long as:
|
||
*
|
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* - Only the first glyph has (or none of the glyphs have) been positioned
|
||
* with SVG text positioning attributes
|
||
* - All of the glyphs have zero rotation
|
||
* - The glyphs are not on a text path
|
||
* - The glyphs correspond to content within the one nsTextFrame
|
||
*
|
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* A TextRenderedRunIterator produces TextRenderedRuns required for painting a
|
||
* whole SVGTextFrame.
|
||
*/
|
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struct TextRenderedRun {
|
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using Range = gfxTextRun::Range;
|
||
|
||
/**
|
||
* Constructs a TextRenderedRun that is uninitialized except for mFrame
|
||
* being null.
|
||
*/
|
||
TextRenderedRun() : mFrame(nullptr) {}
|
||
|
||
/**
|
||
* Constructs a TextRenderedRun with all of the information required to
|
||
* paint it. See the comments documenting the member variables below
|
||
* for descriptions of the arguments.
|
||
*/
|
||
TextRenderedRun(nsTextFrame* aFrame, const gfxPoint& aPosition,
|
||
float aLengthAdjustScaleFactor, double aRotate,
|
||
float aFontSizeScaleFactor, nscoord aBaseline,
|
||
uint32_t aTextFrameContentOffset,
|
||
uint32_t aTextFrameContentLength,
|
||
uint32_t aTextElementCharIndex)
|
||
: mFrame(aFrame),
|
||
mPosition(aPosition),
|
||
mLengthAdjustScaleFactor(aLengthAdjustScaleFactor),
|
||
mRotate(static_cast<float>(aRotate)),
|
||
mFontSizeScaleFactor(aFontSizeScaleFactor),
|
||
mBaseline(aBaseline),
|
||
mTextFrameContentOffset(aTextFrameContentOffset),
|
||
mTextFrameContentLength(aTextFrameContentLength),
|
||
mTextElementCharIndex(aTextElementCharIndex) {}
|
||
|
||
/**
|
||
* Returns the text run for the text frame that this rendered run is part of.
|
||
*/
|
||
gfxTextRun* GetTextRun() const {
|
||
mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
||
return mFrame->GetTextRun(nsTextFrame::eInflated);
|
||
}
|
||
|
||
/**
|
||
* Returns whether this rendered run is RTL.
|
||
*/
|
||
bool IsRightToLeft() const { return GetTextRun()->IsRightToLeft(); }
|
||
|
||
/**
|
||
* Returns whether this rendered run is vertical.
|
||
*/
|
||
bool IsVertical() const { return GetTextRun()->IsVertical(); }
|
||
|
||
/**
|
||
* Returns the transform that converts from a <text> element's user space into
|
||
* the coordinate space that rendered runs can be painted directly in.
|
||
*
|
||
* The difference between this method and
|
||
* GetTransformFromRunUserSpaceToUserSpace is that when calling in to
|
||
* nsTextFrame::PaintText, it will already take into account any left clip
|
||
* edge (that is, it doesn't just apply a visual clip to the rendered text, it
|
||
* shifts the glyphs over so that they are painted with their left edge at the
|
||
* x coordinate passed in to it). Thus we need to account for this in our
|
||
* transform.
|
||
*
|
||
*
|
||
* Assume that we have:
|
||
*
|
||
* <text x="100" y="100" rotate="0 0 1 0 0 * 1">abcdef</text>.
|
||
*
|
||
* This would result in four text rendered runs:
|
||
*
|
||
* - one for "ab"
|
||
* - one for "c"
|
||
* - one for "de"
|
||
* - one for "f"
|
||
*
|
||
* Assume now that we are painting the third TextRenderedRun. It will have
|
||
* a left clip edge that is the sum of the advances of "abc", and it will
|
||
* have a right clip edge that is the advance of "f". In
|
||
* SVGTextFrame::PaintSVG(), we pass in nsPoint() (i.e., the origin)
|
||
* as the point at which to paint the text frame, and we pass in the
|
||
* clip edge values. The nsTextFrame will paint the substring of its
|
||
* text such that the top-left corner of the "d"'s glyph cell will be at
|
||
* (0, 0) in the current coordinate system.
|
||
*
|
||
* Thus, GetTransformFromUserSpaceForPainting must return a transform from
|
||
* whatever user space the <text> element is in to a coordinate space in
|
||
* device pixels (as that's what nsTextFrame works in) where the origin is at
|
||
* the same position as our user space mPositions[i].mPosition value for
|
||
* the "d" glyph, which will be (100 + userSpaceAdvance("abc"), 100).
|
||
* The translation required to do this (ignoring the scale to get from
|
||
* user space to device pixels, and ignoring the
|
||
* (100 + userSpaceAdvance("abc"), 100) translation) is:
|
||
*
|
||
* (-leftEdge, -baseline)
|
||
*
|
||
* where baseline is the distance between the baseline of the text and the top
|
||
* edge of the nsTextFrame. We translate by -leftEdge horizontally because
|
||
* the nsTextFrame will already shift the glyphs over by that amount and start
|
||
* painting glyphs at x = 0. We translate by -baseline vertically so that
|
||
* painting the top edges of the glyphs at y = 0 will result in their
|
||
* baselines being at our desired y position.
|
||
*
|
||
*
|
||
* Now for an example with RTL text. Assume our content is now
|
||
* <text x="100" y="100" rotate="0 0 1 0 0 1">WERBEH</text>. We'd have
|
||
* the following text rendered runs:
|
||
*
|
||
* - one for "EH"
|
||
* - one for "B"
|
||
* - one for "ER"
|
||
* - one for "W"
|
||
*
|
||
* Again, we are painting the third TextRenderedRun. The left clip edge
|
||
* is the advance of the "W" and the right clip edge is the sum of the
|
||
* advances of "BEH". Our translation to get the rendered "ER" glyphs
|
||
* in the right place this time is:
|
||
*
|
||
* (-frameWidth + rightEdge, -baseline)
|
||
*
|
||
* which is equivalent to:
|
||
*
|
||
* (-(leftEdge + advance("ER")), -baseline)
|
||
*
|
||
* The reason we have to shift left additionally by the width of the run
|
||
* of glyphs we are painting is that although the nsTextFrame is RTL,
|
||
* we still supply the top-left corner to paint the frame at when calling
|
||
* nsTextFrame::PaintText, even though our user space positions for each
|
||
* glyph in mPositions specifies the origin of each glyph, which for RTL
|
||
* glyphs is at the right edge of the glyph cell.
|
||
*
|
||
*
|
||
* For any other use of an nsTextFrame in the context of a particular run
|
||
* (such as hit testing, or getting its rectangle),
|
||
* GetTransformFromRunUserSpaceToUserSpace should be used.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
*/
|
||
gfxMatrix GetTransformFromUserSpaceForPainting(
|
||
nsPresContext* aContext, const nscoord aVisIStartEdge,
|
||
const nscoord aVisIEndEdge) const;
|
||
|
||
/**
|
||
* Returns the transform that converts from "run user space" to a <text>
|
||
* element's user space. Run user space is a coordinate system that has the
|
||
* same size as the <text>'s user space but rotated and translated such that
|
||
* (0,0) is the top-left of the rectangle that bounds the text.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
*/
|
||
gfxMatrix GetTransformFromRunUserSpaceToUserSpace(
|
||
nsPresContext* aContext) const;
|
||
|
||
/**
|
||
* Returns the transform that converts from "run user space" to float pixels
|
||
* relative to the nsTextFrame that this rendered run is a part of.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
*/
|
||
gfxMatrix GetTransformFromRunUserSpaceToFrameUserSpace(
|
||
nsPresContext* aContext) const;
|
||
|
||
/**
|
||
* Flag values used for the aFlags arguments of GetRunUserSpaceRect,
|
||
* GetFrameUserSpaceRect and GetUserSpaceRect.
|
||
*/
|
||
enum {
|
||
// Includes the fill geometry of the text in the returned rectangle.
|
||
eIncludeFill = 1,
|
||
// Includes the stroke geometry of the text in the returned rectangle.
|
||
eIncludeStroke = 2,
|
||
// Don't include any horizontal glyph overflow in the returned rectangle.
|
||
eNoHorizontalOverflow = 4
|
||
};
|
||
|
||
/**
|
||
* Returns a rectangle that bounds the fill and/or stroke of the rendered run
|
||
* in run user space.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
* @param aFlags A combination of the flags above (eIncludeFill and
|
||
* eIncludeStroke) indicating what parts of the text to include in
|
||
* the rectangle.
|
||
*/
|
||
SVGBBox GetRunUserSpaceRect(nsPresContext* aContext, uint32_t aFlags) const;
|
||
|
||
/**
|
||
* Returns a rectangle that covers the fill and/or stroke of the rendered run
|
||
* in "frame user space".
|
||
*
|
||
* Frame user space is a coordinate space of the same scale as the <text>
|
||
* element's user space, but with its rotation set to the rotation of
|
||
* the glyphs within this rendered run and its origin set to the position
|
||
* such that placing the nsTextFrame there would result in the glyphs in
|
||
* this rendered run being at their correct positions.
|
||
*
|
||
* For example, say we have <text x="100 150" y="100">ab</text>. Assume
|
||
* the advance of both the "a" and the "b" is 12 user units, and the
|
||
* ascent of the text is 8 user units and its descent is 6 user units,
|
||
* and that we are not measuing the stroke of the text, so that we stay
|
||
* entirely within the glyph cells.
|
||
*
|
||
* There will be two text rendered runs, one for "a" and one for "b".
|
||
*
|
||
* The frame user space for the "a" run will have its origin at
|
||
* (100, 100 - 8) in the <text> element's user space and will have its
|
||
* axes aligned with the user space (since there is no rotate="" or
|
||
* text path involve) and with its scale the same as the user space.
|
||
* The rect returned by this method will be (0, 0, 12, 14), since the "a"
|
||
* glyph is right at the left of the nsTextFrame.
|
||
*
|
||
* The frame user space for the "b" run will have its origin at
|
||
* (150 - 12, 100 - 8), and scale/rotation the same as above. The rect
|
||
* returned by this method will be (12, 0, 12, 14), since we are
|
||
* advance("a") horizontally in to the text frame.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
* @param aFlags A combination of the flags above (eIncludeFill and
|
||
* eIncludeStroke) indicating what parts of the text to include in
|
||
* the rectangle.
|
||
*/
|
||
SVGBBox GetFrameUserSpaceRect(nsPresContext* aContext, uint32_t aFlags) const;
|
||
|
||
/**
|
||
* Returns a rectangle that covers the fill and/or stroke of the rendered run
|
||
* in the <text> element's user space.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
* @param aFlags A combination of the flags above indicating what parts of
|
||
* the text to include in the rectangle.
|
||
* @param aAdditionalTransform An additional transform to apply to the
|
||
* frame user space rectangle before its bounds are transformed into
|
||
* user space.
|
||
*/
|
||
SVGBBox GetUserSpaceRect(
|
||
nsPresContext* aContext, uint32_t aFlags,
|
||
const gfxMatrix* aAdditionalTransform = nullptr) const;
|
||
|
||
/**
|
||
* Gets the app unit amounts to clip from the left and right edges of
|
||
* the nsTextFrame in order to paint just this rendered run.
|
||
*
|
||
* Note that if clip edge amounts land in the middle of a glyph, the
|
||
* glyph won't be painted at all. The clip edges are thus more of
|
||
* a selection mechanism for which glyphs will be painted, rather
|
||
* than a geometric clip.
|
||
*/
|
||
void GetClipEdges(nscoord& aVisIStartEdge, nscoord& aVisIEndEdge) const;
|
||
|
||
/**
|
||
* Returns the advance width of the whole rendered run.
|
||
*/
|
||
nscoord GetAdvanceWidth() const;
|
||
|
||
/**
|
||
* Returns the index of the character into this rendered run whose
|
||
* glyph cell contains the given point, or -1 if there is no such
|
||
* character. This does not hit test against any overflow.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
* @param aPoint The point in the user space of the <text> element.
|
||
*/
|
||
int32_t GetCharNumAtPosition(nsPresContext* aContext,
|
||
const gfxPoint& aPoint) const;
|
||
|
||
/**
|
||
* The text frame that this rendered run lies within.
|
||
*/
|
||
nsTextFrame* mFrame;
|
||
|
||
/**
|
||
* The point in user space that the text is positioned at.
|
||
*
|
||
* For a horizontal run:
|
||
* The x coordinate is the left edge of a LTR run of text or the right edge of
|
||
* an RTL run. The y coordinate is the baseline of the text.
|
||
* For a vertical run:
|
||
* The x coordinate is the baseline of the text.
|
||
* The y coordinate is the top edge of a LTR run, or bottom of RTL.
|
||
*/
|
||
gfxPoint mPosition;
|
||
|
||
/**
|
||
* The horizontal scale factor to apply when painting glyphs to take
|
||
* into account textLength="".
|
||
*/
|
||
float mLengthAdjustScaleFactor;
|
||
|
||
/**
|
||
* The rotation in radians in the user coordinate system that the text has.
|
||
*/
|
||
float mRotate;
|
||
|
||
/**
|
||
* The scale factor that was used to transform the text run's original font
|
||
* size into a sane range for painting and measurement.
|
||
*/
|
||
double mFontSizeScaleFactor;
|
||
|
||
/**
|
||
* The baseline in app units of this text run. The measurement is from the
|
||
* top of the text frame. (From the left edge if vertical.)
|
||
*/
|
||
nscoord mBaseline;
|
||
|
||
/**
|
||
* The offset and length in mFrame's content Text that corresponds to
|
||
* this text rendered run. These are original char indexes.
|
||
*/
|
||
uint32_t mTextFrameContentOffset;
|
||
uint32_t mTextFrameContentLength;
|
||
|
||
/**
|
||
* The character index in the whole SVG <text> element that this text rendered
|
||
* run begins at.
|
||
*/
|
||
uint32_t mTextElementCharIndex;
|
||
};
|
||
|
||
gfxMatrix TextRenderedRun::GetTransformFromUserSpaceForPainting(
|
||
nsPresContext* aContext, const nscoord aVisIStartEdge,
|
||
const nscoord aVisIEndEdge) const {
|
||
// We transform to device pixels positioned such that painting the text frame
|
||
// at (0,0) with aItem will result in the text being in the right place.
|
||
|
||
gfxMatrix m;
|
||
if (!mFrame) {
|
||
return m;
|
||
}
|
||
|
||
float cssPxPerDevPx =
|
||
nsPresContext::AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
||
|
||
// Glyph position in user space.
|
||
m.PreTranslate(mPosition / cssPxPerDevPx);
|
||
|
||
// Take into account any font size scaling and scaling due to textLength="".
|
||
m.PreScale(1.0 / mFontSizeScaleFactor, 1.0 / mFontSizeScaleFactor);
|
||
|
||
// Rotation due to rotate="" or a <textPath>.
|
||
m.PreRotate(mRotate);
|
||
|
||
// Scale for textLength="" and translate to get the text frame
|
||
// to the right place.
|
||
nsPoint t;
|
||
if (IsVertical()) {
|
||
m.PreScale(1.0, mLengthAdjustScaleFactor);
|
||
t = nsPoint(-mBaseline, IsRightToLeft()
|
||
? -mFrame->GetRect().height + aVisIEndEdge
|
||
: -aVisIStartEdge);
|
||
} else {
|
||
m.PreScale(mLengthAdjustScaleFactor, 1.0);
|
||
t = nsPoint(IsRightToLeft() ? -mFrame->GetRect().width + aVisIEndEdge
|
||
: -aVisIStartEdge,
|
||
-mBaseline);
|
||
}
|
||
m.PreTranslate(AppUnitsToGfxUnits(t, aContext));
|
||
|
||
return m;
|
||
}
|
||
|
||
gfxMatrix TextRenderedRun::GetTransformFromRunUserSpaceToUserSpace(
|
||
nsPresContext* aContext) const {
|
||
gfxMatrix m;
|
||
if (!mFrame) {
|
||
return m;
|
||
}
|
||
|
||
float cssPxPerDevPx =
|
||
nsPresContext::AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
||
|
||
nscoord start, end;
|
||
GetClipEdges(start, end);
|
||
|
||
// Glyph position in user space.
|
||
m.PreTranslate(mPosition);
|
||
|
||
// Rotation due to rotate="" or a <textPath>.
|
||
m.PreRotate(mRotate);
|
||
|
||
// Scale for textLength="" and translate to get the text frame
|
||
// to the right place.
|
||
|
||
nsPoint t;
|
||
if (IsVertical()) {
|
||
m.PreScale(1.0, mLengthAdjustScaleFactor);
|
||
t = nsPoint(-mBaseline,
|
||
IsRightToLeft() ? -mFrame->GetRect().height + start + end : 0);
|
||
} else {
|
||
m.PreScale(mLengthAdjustScaleFactor, 1.0);
|
||
t = nsPoint(IsRightToLeft() ? -mFrame->GetRect().width + start + end : 0,
|
||
-mBaseline);
|
||
}
|
||
m.PreTranslate(AppUnitsToGfxUnits(t, aContext) * cssPxPerDevPx /
|
||
mFontSizeScaleFactor);
|
||
|
||
return m;
|
||
}
|
||
|
||
gfxMatrix TextRenderedRun::GetTransformFromRunUserSpaceToFrameUserSpace(
|
||
nsPresContext* aContext) const {
|
||
gfxMatrix m;
|
||
if (!mFrame) {
|
||
return m;
|
||
}
|
||
|
||
nscoord start, end;
|
||
GetClipEdges(start, end);
|
||
|
||
// Translate by the horizontal distance into the text frame this
|
||
// rendered run is.
|
||
gfxFloat appPerCssPx = AppUnitsPerCSSPixel();
|
||
gfxPoint t = IsVertical() ? gfxPoint(0, start / appPerCssPx)
|
||
: gfxPoint(start / appPerCssPx, 0);
|
||
return m.PreTranslate(t);
|
||
}
|
||
|
||
SVGBBox TextRenderedRun::GetRunUserSpaceRect(nsPresContext* aContext,
|
||
uint32_t aFlags) const {
|
||
SVGBBox r;
|
||
if (!mFrame) {
|
||
return r;
|
||
}
|
||
|
||
// Determine the amount of overflow around frame's mRect.
|
||
//
|
||
// We need to call InkOverflowRectRelativeToSelf because this includes
|
||
// overflowing decorations, which the MeasureText call below does not.
|
||
nsRect self = mFrame->InkOverflowRectRelativeToSelf();
|
||
nsRect rect = mFrame->GetRect();
|
||
bool vertical = IsVertical();
|
||
nsMargin inkOverflow(
|
||
vertical ? -self.x : -self.y,
|
||
vertical ? self.YMost() - rect.height : self.XMost() - rect.width,
|
||
vertical ? self.XMost() - rect.width : self.YMost() - rect.height,
|
||
vertical ? -self.y : -self.x);
|
||
|
||
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxSkipCharsIterator start = it;
|
||
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
||
|
||
// Get the content range for this rendered run.
|
||
Range range = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
||
mTextFrameContentLength);
|
||
if (range.Length() == 0) {
|
||
return r;
|
||
}
|
||
|
||
// FIXME(heycam): We could create a single PropertyProvider for all
|
||
// TextRenderedRuns that correspond to the text frame, rather than recreate
|
||
// it each time here.
|
||
nsTextFrame::PropertyProvider provider(mFrame, start);
|
||
|
||
// Measure that range.
|
||
gfxTextRun::Metrics metrics = textRun->MeasureText(
|
||
range, gfxFont::LOOSE_INK_EXTENTS, nullptr, &provider);
|
||
// Make sure it includes the font-box.
|
||
gfxRect fontBox(0, -metrics.mAscent, metrics.mAdvanceWidth,
|
||
metrics.mAscent + metrics.mDescent);
|
||
metrics.mBoundingBox.UnionRect(metrics.mBoundingBox, fontBox);
|
||
|
||
// Determine the rectangle that covers the rendered run's fill,
|
||
// taking into account the measured overflow due to decorations.
|
||
nscoord baseline =
|
||
NSToCoordRoundWithClamp(metrics.mBoundingBox.y + metrics.mAscent);
|
||
gfxFloat x, width;
|
||
if (aFlags & eNoHorizontalOverflow) {
|
||
x = 0.0;
|
||
width = textRun->GetAdvanceWidth(range, &provider);
|
||
if (width < 0.0) {
|
||
x = width;
|
||
width = -width;
|
||
}
|
||
} else {
|
||
x = metrics.mBoundingBox.x;
|
||
width = metrics.mBoundingBox.width;
|
||
}
|
||
nsRect fillInAppUnits(NSToCoordRoundWithClamp(x), baseline,
|
||
NSToCoordRoundWithClamp(width),
|
||
NSToCoordRoundWithClamp(metrics.mBoundingBox.height));
|
||
fillInAppUnits.Inflate(inkOverflow);
|
||
if (textRun->IsVertical()) {
|
||
// Swap line-relative textMetrics dimensions to physical coordinates.
|
||
std::swap(fillInAppUnits.x, fillInAppUnits.y);
|
||
std::swap(fillInAppUnits.width, fillInAppUnits.height);
|
||
}
|
||
|
||
// Convert the app units rectangle to user units.
|
||
gfxRect fill = AppUnitsToFloatCSSPixels(
|
||
gfxRect(fillInAppUnits.x, fillInAppUnits.y, fillInAppUnits.width,
|
||
fillInAppUnits.height),
|
||
aContext);
|
||
|
||
// Scale the rectangle up due to any mFontSizeScaleFactor.
|
||
fill.Scale(1.0 / mFontSizeScaleFactor);
|
||
|
||
// Include the fill if requested.
|
||
if (aFlags & eIncludeFill) {
|
||
r = fill;
|
||
}
|
||
|
||
// Include the stroke if requested.
|
||
if ((aFlags & eIncludeStroke) && !fill.IsEmpty() &&
|
||
SVGUtils::GetStrokeWidth(mFrame) > 0) {
|
||
r.UnionEdges(
|
||
SVGUtils::PathExtentsToMaxStrokeExtents(fill, mFrame, gfxMatrix()));
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
SVGBBox TextRenderedRun::GetFrameUserSpaceRect(nsPresContext* aContext,
|
||
uint32_t aFlags) const {
|
||
SVGBBox r = GetRunUserSpaceRect(aContext, aFlags);
|
||
if (r.IsEmpty()) {
|
||
return r;
|
||
}
|
||
gfxMatrix m = GetTransformFromRunUserSpaceToFrameUserSpace(aContext);
|
||
return m.TransformBounds(r.ToThebesRect());
|
||
}
|
||
|
||
SVGBBox TextRenderedRun::GetUserSpaceRect(
|
||
nsPresContext* aContext, uint32_t aFlags,
|
||
const gfxMatrix* aAdditionalTransform) const {
|
||
SVGBBox r = GetRunUserSpaceRect(aContext, aFlags);
|
||
if (r.IsEmpty()) {
|
||
return r;
|
||
}
|
||
gfxMatrix m = GetTransformFromRunUserSpaceToUserSpace(aContext);
|
||
if (aAdditionalTransform) {
|
||
m *= *aAdditionalTransform;
|
||
}
|
||
return m.TransformBounds(r.ToThebesRect());
|
||
}
|
||
|
||
void TextRenderedRun::GetClipEdges(nscoord& aVisIStartEdge,
|
||
nscoord& aVisIEndEdge) const {
|
||
uint32_t contentLength = mFrame->GetContentLength();
|
||
if (mTextFrameContentOffset == 0 &&
|
||
mTextFrameContentLength == contentLength) {
|
||
// If the rendered run covers the entire content, we know we don't need
|
||
// to clip without having to measure anything.
|
||
aVisIStartEdge = 0;
|
||
aVisIEndEdge = 0;
|
||
return;
|
||
}
|
||
|
||
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(mFrame, it);
|
||
|
||
// Get the covered content offset/length for this rendered run in skipped
|
||
// characters, since that is what GetAdvanceWidth expects.
|
||
Range runRange = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
||
mTextFrameContentLength);
|
||
|
||
// Get the offset/length of the whole nsTextFrame.
|
||
uint32_t frameOffset = mFrame->GetContentOffset();
|
||
uint32_t frameLength = mFrame->GetContentLength();
|
||
|
||
// Trim the whole-nsTextFrame offset/length to remove any leading/trailing
|
||
// white space, as the nsTextFrame when painting does not include them when
|
||
// interpreting clip edges.
|
||
nsTextFrame::TrimmedOffsets trimmedOffsets =
|
||
mFrame->GetTrimmedOffsets(mFrame->TextFragment());
|
||
TrimOffsets(frameOffset, frameLength, trimmedOffsets);
|
||
|
||
// Convert the trimmed whole-nsTextFrame offset/length into skipped
|
||
// characters.
|
||
Range frameRange = ConvertOriginalToSkipped(it, frameOffset, frameLength);
|
||
|
||
// Measure the advance width in the text run between the start of
|
||
// frame's content and the start of the rendered run's content,
|
||
nscoord startEdge = textRun->GetAdvanceWidth(
|
||
Range(frameRange.start, runRange.start), &provider);
|
||
|
||
// and between the end of the rendered run's content and the end
|
||
// of the frame's content.
|
||
nscoord endEdge =
|
||
textRun->GetAdvanceWidth(Range(runRange.end, frameRange.end), &provider);
|
||
|
||
if (textRun->IsRightToLeft()) {
|
||
aVisIStartEdge = endEdge;
|
||
aVisIEndEdge = startEdge;
|
||
} else {
|
||
aVisIStartEdge = startEdge;
|
||
aVisIEndEdge = endEdge;
|
||
}
|
||
}
|
||
|
||
nscoord TextRenderedRun::GetAdvanceWidth() const {
|
||
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(mFrame, it);
|
||
|
||
Range range = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
||
mTextFrameContentLength);
|
||
|
||
return textRun->GetAdvanceWidth(range, &provider);
|
||
}
|
||
|
||
int32_t TextRenderedRun::GetCharNumAtPosition(nsPresContext* aContext,
|
||
const gfxPoint& aPoint) const {
|
||
if (mTextFrameContentLength == 0) {
|
||
return -1;
|
||
}
|
||
|
||
float cssPxPerDevPx =
|
||
nsPresContext::AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
||
|
||
// Convert the point from user space into run user space, and take
|
||
// into account any mFontSizeScaleFactor.
|
||
gfxMatrix m = GetTransformFromRunUserSpaceToUserSpace(aContext);
|
||
if (!m.Invert()) {
|
||
return -1;
|
||
}
|
||
gfxPoint p = m.TransformPoint(aPoint) / cssPxPerDevPx * mFontSizeScaleFactor;
|
||
|
||
// First check that the point lies vertically between the top and bottom
|
||
// edges of the text.
|
||
gfxFloat ascent, descent;
|
||
GetAscentAndDescentInAppUnits(mFrame, ascent, descent);
|
||
|
||
WritingMode writingMode = mFrame->GetWritingMode();
|
||
if (writingMode.IsVertical()) {
|
||
gfxFloat leftEdge = mFrame->GetLogicalBaseline(writingMode) -
|
||
(writingMode.IsVerticalRL() ? ascent : descent);
|
||
gfxFloat rightEdge = leftEdge + ascent + descent;
|
||
if (p.x < aContext->AppUnitsToGfxUnits(leftEdge) ||
|
||
p.x > aContext->AppUnitsToGfxUnits(rightEdge)) {
|
||
return -1;
|
||
}
|
||
} else {
|
||
gfxFloat topEdge = mFrame->GetLogicalBaseline(writingMode) - ascent;
|
||
gfxFloat bottomEdge = topEdge + ascent + descent;
|
||
if (p.y < aContext->AppUnitsToGfxUnits(topEdge) ||
|
||
p.y > aContext->AppUnitsToGfxUnits(bottomEdge)) {
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(mFrame, it);
|
||
|
||
// Next check that the point lies horizontally within the left and right
|
||
// edges of the text.
|
||
Range range = ConvertOriginalToSkipped(it, mTextFrameContentOffset,
|
||
mTextFrameContentLength);
|
||
gfxFloat runAdvance =
|
||
aContext->AppUnitsToGfxUnits(textRun->GetAdvanceWidth(range, &provider));
|
||
|
||
gfxFloat pos = writingMode.IsVertical() ? p.y : p.x;
|
||
if (pos < 0 || pos >= runAdvance) {
|
||
return -1;
|
||
}
|
||
|
||
// Finally, measure progressively smaller portions of the rendered run to
|
||
// find which glyph it lies within. This will need to change once we
|
||
// support letter-spacing and word-spacing.
|
||
bool rtl = textRun->IsRightToLeft();
|
||
for (int32_t i = mTextFrameContentLength - 1; i >= 0; i--) {
|
||
range = ConvertOriginalToSkipped(it, mTextFrameContentOffset, i);
|
||
gfxFloat advance = aContext->AppUnitsToGfxUnits(
|
||
textRun->GetAdvanceWidth(range, &provider));
|
||
if ((rtl && pos < runAdvance - advance) || (!rtl && pos >= advance)) {
|
||
return i;
|
||
}
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
// ----------------------------------------------------------------------------
|
||
// TextNodeIterator
|
||
|
||
enum SubtreePosition { eBeforeSubtree, eWithinSubtree, eAfterSubtree };
|
||
|
||
/**
|
||
* An iterator class for Text that are descendants of a given node, the
|
||
* root. Nodes are iterated in document order. An optional subtree can be
|
||
* specified, in which case the iterator will track whether the current state of
|
||
* the traversal over the tree is within that subtree or is past that subtree.
|
||
*/
|
||
class TextNodeIterator {
|
||
public:
|
||
/**
|
||
* Constructs a TextNodeIterator with the specified root node and optional
|
||
* subtree.
|
||
*/
|
||
explicit TextNodeIterator(nsIContent* aRoot, nsIContent* aSubtree = nullptr)
|
||
: mRoot(aRoot),
|
||
mSubtree(aSubtree == aRoot ? nullptr : aSubtree),
|
||
mCurrent(aRoot),
|
||
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree) {
|
||
NS_ASSERTION(aRoot, "expected non-null root");
|
||
if (!aRoot->IsText()) {
|
||
Next();
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Returns the current Text, or null if the iterator has finished.
|
||
*/
|
||
Text* Current() const { return mCurrent ? mCurrent->AsText() : nullptr; }
|
||
|
||
/**
|
||
* Advances to the next Text and returns it, or null if the end of
|
||
* iteration has been reached.
|
||
*/
|
||
Text* Next();
|
||
|
||
/**
|
||
* Returns whether the iterator is currently within the subtree rooted
|
||
* at mSubtree. Returns true if we are not tracking a subtree (we consider
|
||
* that we're always within the subtree).
|
||
*/
|
||
bool IsWithinSubtree() const { return mSubtreePosition == eWithinSubtree; }
|
||
|
||
/**
|
||
* Returns whether the iterator is past the subtree rooted at mSubtree.
|
||
* Returns false if we are not tracking a subtree.
|
||
*/
|
||
bool IsAfterSubtree() const { return mSubtreePosition == eAfterSubtree; }
|
||
|
||
private:
|
||
/**
|
||
* The root under which all Text will be iterated over.
|
||
*/
|
||
nsIContent* const mRoot;
|
||
|
||
/**
|
||
* The node rooting the subtree to track.
|
||
*/
|
||
nsIContent* const mSubtree;
|
||
|
||
/**
|
||
* The current node during iteration.
|
||
*/
|
||
nsIContent* mCurrent;
|
||
|
||
/**
|
||
* The current iterator position relative to mSubtree.
|
||
*/
|
||
SubtreePosition mSubtreePosition;
|
||
};
|
||
|
||
Text* TextNodeIterator::Next() {
|
||
// Starting from mCurrent, we do a non-recursive traversal to the next
|
||
// Text beneath mRoot, updating mSubtreePosition appropriately if we
|
||
// encounter mSubtree.
|
||
if (mCurrent) {
|
||
do {
|
||
nsIContent* next =
|
||
IsTextContentElement(mCurrent) ? mCurrent->GetFirstChild() : nullptr;
|
||
if (next) {
|
||
mCurrent = next;
|
||
if (mCurrent == mSubtree) {
|
||
mSubtreePosition = eWithinSubtree;
|
||
}
|
||
} else {
|
||
for (;;) {
|
||
if (mCurrent == mRoot) {
|
||
mCurrent = nullptr;
|
||
break;
|
||
}
|
||
if (mCurrent == mSubtree) {
|
||
mSubtreePosition = eAfterSubtree;
|
||
}
|
||
next = mCurrent->GetNextSibling();
|
||
if (next) {
|
||
mCurrent = next;
|
||
if (mCurrent == mSubtree) {
|
||
mSubtreePosition = eWithinSubtree;
|
||
}
|
||
break;
|
||
}
|
||
if (mCurrent == mSubtree) {
|
||
mSubtreePosition = eAfterSubtree;
|
||
}
|
||
mCurrent = mCurrent->GetParent();
|
||
}
|
||
}
|
||
} while (mCurrent && !mCurrent->IsText());
|
||
}
|
||
|
||
return mCurrent ? mCurrent->AsText() : nullptr;
|
||
}
|
||
|
||
// ----------------------------------------------------------------------------
|
||
// TextNodeCorrespondenceRecorder
|
||
|
||
/**
|
||
* TextNodeCorrespondence is used as the value of a frame property that
|
||
* is stored on all its descendant nsTextFrames. It stores the number of DOM
|
||
* characters between it and the previous nsTextFrame that did not have an
|
||
* nsTextFrame created for them, due to either not being in a correctly
|
||
* parented text content element, or because they were display:none.
|
||
* These are called "undisplayed characters".
|
||
*
|
||
* See also TextNodeCorrespondenceRecorder below, which is what sets the
|
||
* frame property.
|
||
*/
|
||
struct TextNodeCorrespondence {
|
||
explicit TextNodeCorrespondence(uint32_t aUndisplayedCharacters)
|
||
: mUndisplayedCharacters(aUndisplayedCharacters) {}
|
||
|
||
uint32_t mUndisplayedCharacters;
|
||
};
|
||
|
||
NS_DECLARE_FRAME_PROPERTY_DELETABLE(TextNodeCorrespondenceProperty,
|
||
TextNodeCorrespondence)
|
||
|
||
/**
|
||
* Returns the number of undisplayed characters before the specified
|
||
* nsTextFrame.
|
||
*/
|
||
static uint32_t GetUndisplayedCharactersBeforeFrame(nsTextFrame* aFrame) {
|
||
void* value = aFrame->GetProperty(TextNodeCorrespondenceProperty());
|
||
TextNodeCorrespondence* correspondence =
|
||
static_cast<TextNodeCorrespondence*>(value);
|
||
if (!correspondence) {
|
||
// FIXME bug 903785
|
||
NS_ERROR(
|
||
"expected a TextNodeCorrespondenceProperty on nsTextFrame "
|
||
"used for SVG text");
|
||
return 0;
|
||
}
|
||
return correspondence->mUndisplayedCharacters;
|
||
}
|
||
|
||
/**
|
||
* Traverses the nsTextFrames for an SVGTextFrame and records a
|
||
* TextNodeCorrespondenceProperty on each for the number of undisplayed DOM
|
||
* characters between each frame. This is done by iterating simultaneously
|
||
* over the Text and nsTextFrames and noting when Text (or
|
||
* parts of them) are skipped when finding the next nsTextFrame.
|
||
*/
|
||
class TextNodeCorrespondenceRecorder {
|
||
public:
|
||
/**
|
||
* Entry point for the TextNodeCorrespondenceProperty recording.
|
||
*/
|
||
static void RecordCorrespondence(SVGTextFrame* aRoot);
|
||
|
||
private:
|
||
explicit TextNodeCorrespondenceRecorder(SVGTextFrame* aRoot)
|
||
: mNodeIterator(aRoot->GetContent()),
|
||
mPreviousNode(nullptr),
|
||
mNodeCharIndex(0) {}
|
||
|
||
void Record(SVGTextFrame* aRoot);
|
||
void TraverseAndRecord(nsIFrame* aFrame);
|
||
|
||
/**
|
||
* Returns the next non-empty Text.
|
||
*/
|
||
Text* NextNode();
|
||
|
||
/**
|
||
* The iterator over the Text that we use as we simultaneously
|
||
* iterate over the nsTextFrames.
|
||
*/
|
||
TextNodeIterator mNodeIterator;
|
||
|
||
/**
|
||
* The previous Text we iterated over.
|
||
*/
|
||
Text* mPreviousNode;
|
||
|
||
/**
|
||
* The index into the current Text's character content.
|
||
*/
|
||
uint32_t mNodeCharIndex;
|
||
};
|
||
|
||
/* static */
|
||
void TextNodeCorrespondenceRecorder::RecordCorrespondence(SVGTextFrame* aRoot) {
|
||
if (aRoot->HasAnyStateBits(NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY)) {
|
||
// Resolve bidi so that continuation frames are created if necessary:
|
||
aRoot->MaybeResolveBidiForAnonymousBlockChild();
|
||
TextNodeCorrespondenceRecorder recorder(aRoot);
|
||
recorder.Record(aRoot);
|
||
aRoot->RemoveStateBits(NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY);
|
||
}
|
||
}
|
||
|
||
void TextNodeCorrespondenceRecorder::Record(SVGTextFrame* aRoot) {
|
||
if (!mNodeIterator.Current()) {
|
||
// If there are no Text nodes then there is nothing to do.
|
||
return;
|
||
}
|
||
|
||
// Traverse over all the nsTextFrames and record the number of undisplayed
|
||
// characters.
|
||
TraverseAndRecord(aRoot);
|
||
|
||
// Find how many undisplayed characters there are after the final nsTextFrame.
|
||
uint32_t undisplayed = 0;
|
||
if (mNodeIterator.Current()) {
|
||
if (mPreviousNode && mPreviousNode->TextLength() != mNodeCharIndex) {
|
||
// The last nsTextFrame ended part way through a Text node. The
|
||
// remaining characters count as undisplayed.
|
||
NS_ASSERTION(mNodeCharIndex < mPreviousNode->TextLength(),
|
||
"incorrect tracking of undisplayed characters in "
|
||
"text nodes");
|
||
undisplayed += mPreviousNode->TextLength() - mNodeCharIndex;
|
||
}
|
||
// All the remaining Text that we iterate must also be undisplayed.
|
||
for (Text* textNode = mNodeIterator.Current(); textNode;
|
||
textNode = NextNode()) {
|
||
undisplayed += textNode->TextLength();
|
||
}
|
||
}
|
||
|
||
// Record the trailing number of undisplayed characters on the
|
||
// SVGTextFrame.
|
||
aRoot->mTrailingUndisplayedCharacters = undisplayed;
|
||
}
|
||
|
||
Text* TextNodeCorrespondenceRecorder::NextNode() {
|
||
mPreviousNode = mNodeIterator.Current();
|
||
Text* next;
|
||
do {
|
||
next = mNodeIterator.Next();
|
||
} while (next && next->TextLength() == 0);
|
||
return next;
|
||
}
|
||
|
||
void TextNodeCorrespondenceRecorder::TraverseAndRecord(nsIFrame* aFrame) {
|
||
// Recursively iterate over the frame tree, for frames that correspond
|
||
// to text content elements.
|
||
if (IsTextContentElement(aFrame->GetContent())) {
|
||
for (nsIFrame* f : aFrame->PrincipalChildList()) {
|
||
TraverseAndRecord(f);
|
||
}
|
||
return;
|
||
}
|
||
|
||
nsTextFrame* frame; // The current text frame.
|
||
Text* node; // The text node for the current text frame.
|
||
if (!GetNonEmptyTextFrameAndNode(aFrame, frame, node)) {
|
||
// If this isn't an nsTextFrame, or is empty, nothing to do.
|
||
return;
|
||
}
|
||
|
||
NS_ASSERTION(frame->GetContentOffset() >= 0,
|
||
"don't know how to handle negative content indexes");
|
||
|
||
uint32_t undisplayed = 0;
|
||
if (!mPreviousNode) {
|
||
// Must be the very first text frame.
|
||
NS_ASSERTION(mNodeCharIndex == 0,
|
||
"incorrect tracking of undisplayed "
|
||
"characters in text nodes");
|
||
if (!mNodeIterator.Current()) {
|
||
MOZ_ASSERT_UNREACHABLE(
|
||
"incorrect tracking of correspondence between "
|
||
"text frames and text nodes");
|
||
} else {
|
||
// Each whole Text we find before we get to the text node for the
|
||
// first text frame must be undisplayed.
|
||
while (mNodeIterator.Current() != node) {
|
||
undisplayed += mNodeIterator.Current()->TextLength();
|
||
NextNode();
|
||
}
|
||
// If the first text frame starts at a non-zero content offset, then those
|
||
// earlier characters are also undisplayed.
|
||
undisplayed += frame->GetContentOffset();
|
||
NextNode();
|
||
}
|
||
} else if (mPreviousNode == node) {
|
||
// Same text node as last time.
|
||
if (static_cast<uint32_t>(frame->GetContentOffset()) != mNodeCharIndex) {
|
||
// We have some characters in the middle of the text node
|
||
// that are undisplayed.
|
||
NS_ASSERTION(
|
||
mNodeCharIndex < static_cast<uint32_t>(frame->GetContentOffset()),
|
||
"incorrect tracking of undisplayed characters in "
|
||
"text nodes");
|
||
undisplayed = frame->GetContentOffset() - mNodeCharIndex;
|
||
}
|
||
} else {
|
||
// Different text node from last time.
|
||
if (mPreviousNode->TextLength() != mNodeCharIndex) {
|
||
NS_ASSERTION(mNodeCharIndex < mPreviousNode->TextLength(),
|
||
"incorrect tracking of undisplayed characters in "
|
||
"text nodes");
|
||
// Any trailing characters at the end of the previous Text are
|
||
// undisplayed.
|
||
undisplayed = mPreviousNode->TextLength() - mNodeCharIndex;
|
||
}
|
||
// Each whole Text we find before we get to the text node for
|
||
// the current text frame must be undisplayed.
|
||
while (mNodeIterator.Current() && mNodeIterator.Current() != node) {
|
||
undisplayed += mNodeIterator.Current()->TextLength();
|
||
NextNode();
|
||
}
|
||
// If the current text frame starts at a non-zero content offset, then those
|
||
// earlier characters are also undisplayed.
|
||
undisplayed += frame->GetContentOffset();
|
||
NextNode();
|
||
}
|
||
|
||
// Set the frame property.
|
||
frame->SetProperty(TextNodeCorrespondenceProperty(),
|
||
new TextNodeCorrespondence(undisplayed));
|
||
|
||
// Remember how far into the current Text we are.
|
||
mNodeCharIndex = frame->GetContentEnd();
|
||
}
|
||
|
||
// ----------------------------------------------------------------------------
|
||
// TextFrameIterator
|
||
|
||
/**
|
||
* An iterator class for nsTextFrames that are descendants of an
|
||
* SVGTextFrame. The iterator can optionally track whether the
|
||
* current nsTextFrame is for a descendant of, or past, a given subtree
|
||
* content node or frame. (This functionality is used for example by the SVG
|
||
* DOM text methods to get only the nsTextFrames for a particular <tspan>.)
|
||
*
|
||
* TextFrameIterator also tracks and exposes other information about the
|
||
* current nsTextFrame:
|
||
*
|
||
* * how many undisplayed characters came just before it
|
||
* * its position (in app units) relative to the SVGTextFrame's anonymous
|
||
* block frame
|
||
* * what nsInlineFrame corresponding to a <textPath> element it is a
|
||
* descendant of
|
||
* * what computed dominant-baseline value applies to it
|
||
*
|
||
* Note that any text frames that are empty -- whose ContentLength() is 0 --
|
||
* will be skipped over.
|
||
*/
|
||
class MOZ_STACK_CLASS TextFrameIterator {
|
||
public:
|
||
/**
|
||
* Constructs a TextFrameIterator for the specified SVGTextFrame
|
||
* with an optional frame subtree to restrict iterated text frames to.
|
||
*/
|
||
explicit TextFrameIterator(SVGTextFrame* aRoot,
|
||
const nsIFrame* aSubtree = nullptr)
|
||
: mRootFrame(aRoot),
|
||
mSubtree(aSubtree),
|
||
mCurrentFrame(aRoot),
|
||
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree) {
|
||
Init();
|
||
}
|
||
|
||
/**
|
||
* Constructs a TextFrameIterator for the specified SVGTextFrame
|
||
* with an optional frame content subtree to restrict iterated text frames to.
|
||
*/
|
||
TextFrameIterator(SVGTextFrame* aRoot, nsIContent* aSubtree)
|
||
: mRootFrame(aRoot),
|
||
mSubtree(aRoot && aSubtree && aSubtree != aRoot->GetContent()
|
||
? aSubtree->GetPrimaryFrame()
|
||
: nullptr),
|
||
mCurrentFrame(aRoot),
|
||
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree) {
|
||
Init();
|
||
}
|
||
|
||
/**
|
||
* Returns the root SVGTextFrame this TextFrameIterator is iterating over.
|
||
*/
|
||
SVGTextFrame* Root() const { return mRootFrame; }
|
||
|
||
/**
|
||
* Returns the current nsTextFrame.
|
||
*/
|
||
nsTextFrame* Current() const { return do_QueryFrame(mCurrentFrame); }
|
||
|
||
/**
|
||
* Returns the number of undisplayed characters in the DOM just before the
|
||
* current frame.
|
||
*/
|
||
uint32_t UndisplayedCharacters() const;
|
||
|
||
/**
|
||
* Returns the current frame's position, in app units, relative to the
|
||
* root SVGTextFrame's anonymous block frame.
|
||
*/
|
||
nsPoint Position() const { return mCurrentPosition; }
|
||
|
||
/**
|
||
* Advances to the next nsTextFrame and returns it.
|
||
*/
|
||
nsTextFrame* Next();
|
||
|
||
/**
|
||
* Returns whether the iterator is within the subtree.
|
||
*/
|
||
bool IsWithinSubtree() const { return mSubtreePosition == eWithinSubtree; }
|
||
|
||
/**
|
||
* Returns whether the iterator is past the subtree.
|
||
*/
|
||
bool IsAfterSubtree() const { return mSubtreePosition == eAfterSubtree; }
|
||
|
||
/**
|
||
* Returns the frame corresponding to the <textPath> element, if we
|
||
* are inside one.
|
||
*/
|
||
nsIFrame* TextPathFrame() const {
|
||
return mTextPathFrames.IsEmpty() ? nullptr : mTextPathFrames.LastElement();
|
||
}
|
||
|
||
/**
|
||
* Returns the current frame's computed dominant-baseline value.
|
||
*/
|
||
StyleDominantBaseline DominantBaseline() const {
|
||
return mBaselines.LastElement();
|
||
}
|
||
|
||
/**
|
||
* Finishes the iterator.
|
||
*/
|
||
void Close() { mCurrentFrame = nullptr; }
|
||
|
||
private:
|
||
/**
|
||
* Initializes the iterator and advances to the first item.
|
||
*/
|
||
void Init() {
|
||
if (!mRootFrame) {
|
||
return;
|
||
}
|
||
|
||
mBaselines.AppendElement(mRootFrame->StyleSVG()->mDominantBaseline);
|
||
Next();
|
||
}
|
||
|
||
/**
|
||
* Pushes the specified frame's computed dominant-baseline value.
|
||
* If the value of the property is "auto", then the parent frame's
|
||
* computed value is used.
|
||
*/
|
||
void PushBaseline(nsIFrame* aNextFrame);
|
||
|
||
/**
|
||
* Pops the current dominant-baseline off the stack.
|
||
*/
|
||
void PopBaseline();
|
||
|
||
/**
|
||
* The root frame we are iterating through.
|
||
*/
|
||
SVGTextFrame* const mRootFrame;
|
||
|
||
/**
|
||
* The frame for the subtree we are also interested in tracking.
|
||
*/
|
||
const nsIFrame* const mSubtree;
|
||
|
||
/**
|
||
* The current value of the iterator.
|
||
*/
|
||
nsIFrame* mCurrentFrame;
|
||
|
||
/**
|
||
* The position, in app units, of the current frame relative to mRootFrame.
|
||
*/
|
||
nsPoint mCurrentPosition;
|
||
|
||
/**
|
||
* Stack of frames corresponding to <textPath> elements that are in scope
|
||
* for the current frame.
|
||
*/
|
||
AutoTArray<nsIFrame*, 1> mTextPathFrames;
|
||
|
||
/**
|
||
* Stack of dominant-baseline values to record as we traverse through the
|
||
* frame tree.
|
||
*/
|
||
AutoTArray<StyleDominantBaseline, 8> mBaselines;
|
||
|
||
/**
|
||
* The iterator's current position relative to mSubtree.
|
||
*/
|
||
SubtreePosition mSubtreePosition;
|
||
};
|
||
|
||
uint32_t TextFrameIterator::UndisplayedCharacters() const {
|
||
MOZ_ASSERT(
|
||
!mRootFrame->HasAnyStateBits(NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY),
|
||
"Text correspondence must be up to date");
|
||
|
||
if (!mCurrentFrame) {
|
||
return mRootFrame->mTrailingUndisplayedCharacters;
|
||
}
|
||
|
||
nsTextFrame* frame = do_QueryFrame(mCurrentFrame);
|
||
return GetUndisplayedCharactersBeforeFrame(frame);
|
||
}
|
||
|
||
nsTextFrame* TextFrameIterator::Next() {
|
||
// Starting from mCurrentFrame, we do a non-recursive traversal to the next
|
||
// nsTextFrame beneath mRoot, updating mSubtreePosition appropriately if we
|
||
// encounter mSubtree.
|
||
if (mCurrentFrame) {
|
||
do {
|
||
nsIFrame* next = IsTextContentElement(mCurrentFrame->GetContent())
|
||
? mCurrentFrame->PrincipalChildList().FirstChild()
|
||
: nullptr;
|
||
if (next) {
|
||
// Descend into this frame, and accumulate its position.
|
||
mCurrentPosition += next->GetPosition();
|
||
if (next->GetContent()->IsSVGElement(nsGkAtoms::textPath)) {
|
||
// Record this <textPath> frame.
|
||
mTextPathFrames.AppendElement(next);
|
||
}
|
||
// Record the frame's baseline.
|
||
PushBaseline(next);
|
||
mCurrentFrame = next;
|
||
if (mCurrentFrame == mSubtree) {
|
||
// If the current frame is mSubtree, we have now moved into it.
|
||
mSubtreePosition = eWithinSubtree;
|
||
}
|
||
} else {
|
||
for (;;) {
|
||
// We want to move past the current frame.
|
||
if (mCurrentFrame == mRootFrame) {
|
||
// If we've reached the root frame, we're finished.
|
||
mCurrentFrame = nullptr;
|
||
break;
|
||
}
|
||
// Remove the current frame's position.
|
||
mCurrentPosition -= mCurrentFrame->GetPosition();
|
||
if (mCurrentFrame->GetContent()->IsSVGElement(nsGkAtoms::textPath)) {
|
||
// Pop off the <textPath> frame if this is a <textPath>.
|
||
mTextPathFrames.RemoveLastElement();
|
||
}
|
||
// Pop off the current baseline.
|
||
PopBaseline();
|
||
if (mCurrentFrame == mSubtree) {
|
||
// If this was mSubtree, we have now moved past it.
|
||
mSubtreePosition = eAfterSubtree;
|
||
}
|
||
next = mCurrentFrame->GetNextSibling();
|
||
if (next) {
|
||
// Moving to the next sibling.
|
||
mCurrentPosition += next->GetPosition();
|
||
if (next->GetContent()->IsSVGElement(nsGkAtoms::textPath)) {
|
||
// Record this <textPath> frame.
|
||
mTextPathFrames.AppendElement(next);
|
||
}
|
||
// Record the frame's baseline.
|
||
PushBaseline(next);
|
||
mCurrentFrame = next;
|
||
if (mCurrentFrame == mSubtree) {
|
||
// If the current frame is mSubtree, we have now moved into it.
|
||
mSubtreePosition = eWithinSubtree;
|
||
}
|
||
break;
|
||
}
|
||
if (mCurrentFrame == mSubtree) {
|
||
// If there is no next sibling frame, and the current frame is
|
||
// mSubtree, we have now moved past it.
|
||
mSubtreePosition = eAfterSubtree;
|
||
}
|
||
// Ascend out of this frame.
|
||
mCurrentFrame = mCurrentFrame->GetParent();
|
||
}
|
||
}
|
||
} while (mCurrentFrame && !IsNonEmptyTextFrame(mCurrentFrame));
|
||
}
|
||
|
||
return Current();
|
||
}
|
||
|
||
void TextFrameIterator::PushBaseline(nsIFrame* aNextFrame) {
|
||
StyleDominantBaseline baseline = aNextFrame->StyleSVG()->mDominantBaseline;
|
||
mBaselines.AppendElement(baseline);
|
||
}
|
||
|
||
void TextFrameIterator::PopBaseline() {
|
||
NS_ASSERTION(!mBaselines.IsEmpty(), "popped too many baselines");
|
||
mBaselines.RemoveLastElement();
|
||
}
|
||
|
||
// -----------------------------------------------------------------------------
|
||
// TextRenderedRunIterator
|
||
|
||
/**
|
||
* Iterator for TextRenderedRun objects for the SVGTextFrame.
|
||
*/
|
||
class TextRenderedRunIterator {
|
||
public:
|
||
/**
|
||
* Values for the aFilter argument of the constructor, to indicate which
|
||
* frames we should be limited to iterating TextRenderedRun objects for.
|
||
*/
|
||
enum RenderedRunFilter {
|
||
// Iterate TextRenderedRuns for all nsTextFrames.
|
||
eAllFrames,
|
||
// Iterate only TextRenderedRuns for nsTextFrames that are
|
||
// visibility:visible.
|
||
eVisibleFrames
|
||
};
|
||
|
||
/**
|
||
* Constructs a TextRenderedRunIterator with an optional frame subtree to
|
||
* restrict iterated rendered runs to.
|
||
*
|
||
* @param aSVGTextFrame The SVGTextFrame whose rendered runs to iterate
|
||
* through.
|
||
* @param aFilter Indicates whether to iterate rendered runs for non-visible
|
||
* nsTextFrames.
|
||
* @param aSubtree An optional frame subtree to restrict iterated rendered
|
||
* runs to.
|
||
*/
|
||
explicit TextRenderedRunIterator(SVGTextFrame* aSVGTextFrame,
|
||
RenderedRunFilter aFilter = eAllFrames,
|
||
const nsIFrame* aSubtree = nullptr)
|
||
: mFrameIterator(FrameIfAnonymousChildReflowed(aSVGTextFrame), aSubtree),
|
||
mFilter(aFilter),
|
||
mTextElementCharIndex(0),
|
||
mFrameStartTextElementCharIndex(0),
|
||
mFontSizeScaleFactor(aSVGTextFrame->mFontSizeScaleFactor),
|
||
mCurrent(First()) {}
|
||
|
||
/**
|
||
* Constructs a TextRenderedRunIterator with a content subtree to restrict
|
||
* iterated rendered runs to.
|
||
*
|
||
* @param aSVGTextFrame The SVGTextFrame whose rendered runs to iterate
|
||
* through.
|
||
* @param aFilter Indicates whether to iterate rendered runs for non-visible
|
||
* nsTextFrames.
|
||
* @param aSubtree A content subtree to restrict iterated rendered runs to.
|
||
*/
|
||
TextRenderedRunIterator(SVGTextFrame* aSVGTextFrame,
|
||
RenderedRunFilter aFilter, nsIContent* aSubtree)
|
||
: mFrameIterator(FrameIfAnonymousChildReflowed(aSVGTextFrame), aSubtree),
|
||
mFilter(aFilter),
|
||
mTextElementCharIndex(0),
|
||
mFrameStartTextElementCharIndex(0),
|
||
mFontSizeScaleFactor(aSVGTextFrame->mFontSizeScaleFactor),
|
||
mCurrent(First()) {}
|
||
|
||
/**
|
||
* Returns the current TextRenderedRun.
|
||
*/
|
||
TextRenderedRun Current() const { return mCurrent; }
|
||
|
||
/**
|
||
* Advances to the next TextRenderedRun and returns it.
|
||
*/
|
||
TextRenderedRun Next();
|
||
|
||
private:
|
||
/**
|
||
* Returns the root SVGTextFrame this iterator is for.
|
||
*/
|
||
SVGTextFrame* Root() const { return mFrameIterator.Root(); }
|
||
|
||
/**
|
||
* Advances to the first TextRenderedRun and returns it.
|
||
*/
|
||
TextRenderedRun First();
|
||
|
||
/**
|
||
* The frame iterator to use.
|
||
*/
|
||
TextFrameIterator mFrameIterator;
|
||
|
||
/**
|
||
* The filter indicating which TextRenderedRuns to return.
|
||
*/
|
||
RenderedRunFilter mFilter;
|
||
|
||
/**
|
||
* The character index across the entire <text> element we are currently
|
||
* up to.
|
||
*/
|
||
uint32_t mTextElementCharIndex;
|
||
|
||
/**
|
||
* The character index across the entire <text> for the start of the current
|
||
* frame.
|
||
*/
|
||
uint32_t mFrameStartTextElementCharIndex;
|
||
|
||
/**
|
||
* The font-size scale factor we used when constructing the nsTextFrames.
|
||
*/
|
||
double mFontSizeScaleFactor;
|
||
|
||
/**
|
||
* The current TextRenderedRun.
|
||
*/
|
||
TextRenderedRun mCurrent;
|
||
};
|
||
|
||
TextRenderedRun TextRenderedRunIterator::Next() {
|
||
if (!mFrameIterator.Current()) {
|
||
// If there are no more frames, then there are no more rendered runs to
|
||
// return.
|
||
mCurrent = TextRenderedRun();
|
||
return mCurrent;
|
||
}
|
||
|
||
// The values we will use to initialize the TextRenderedRun with.
|
||
nsTextFrame* frame;
|
||
gfxPoint pt;
|
||
double rotate;
|
||
nscoord baseline;
|
||
uint32_t offset, length;
|
||
uint32_t charIndex;
|
||
|
||
// We loop, because we want to skip over rendered runs that either aren't
|
||
// within our subtree of interest, because they don't match the filter,
|
||
// or because they are hidden due to having fallen off the end of a
|
||
// <textPath>.
|
||
for (;;) {
|
||
if (mFrameIterator.IsAfterSubtree()) {
|
||
mCurrent = TextRenderedRun();
|
||
return mCurrent;
|
||
}
|
||
|
||
frame = mFrameIterator.Current();
|
||
|
||
charIndex = mTextElementCharIndex;
|
||
|
||
// Find the end of the rendered run, by looking through the
|
||
// SVGTextFrame's positions array until we find one that is recorded
|
||
// as a run boundary.
|
||
uint32_t runStart,
|
||
runEnd; // XXX Replace runStart with mTextElementCharIndex.
|
||
runStart = mTextElementCharIndex;
|
||
runEnd = runStart + 1;
|
||
while (runEnd < Root()->mPositions.Length() &&
|
||
!Root()->mPositions[runEnd].mRunBoundary) {
|
||
runEnd++;
|
||
}
|
||
|
||
// Convert the global run start/end indexes into an offset/length into the
|
||
// current frame's Text.
|
||
offset =
|
||
frame->GetContentOffset() + runStart - mFrameStartTextElementCharIndex;
|
||
length = runEnd - runStart;
|
||
|
||
// If the end of the frame's content comes before the run boundary we found
|
||
// in SVGTextFrame's position array, we need to shorten the rendered run.
|
||
uint32_t contentEnd = frame->GetContentEnd();
|
||
if (offset + length > contentEnd) {
|
||
length = contentEnd - offset;
|
||
}
|
||
|
||
NS_ASSERTION(offset >= uint32_t(frame->GetContentOffset()),
|
||
"invalid offset");
|
||
NS_ASSERTION(offset + length <= contentEnd, "invalid offset or length");
|
||
|
||
// Get the frame's baseline position.
|
||
frame->EnsureTextRun(nsTextFrame::eInflated);
|
||
baseline = GetBaselinePosition(
|
||
frame, frame->GetTextRun(nsTextFrame::eInflated),
|
||
mFrameIterator.DominantBaseline(), mFontSizeScaleFactor);
|
||
|
||
// Trim the offset/length to remove any leading/trailing white space.
|
||
uint32_t untrimmedOffset = offset;
|
||
uint32_t untrimmedLength = length;
|
||
nsTextFrame::TrimmedOffsets trimmedOffsets =
|
||
frame->GetTrimmedOffsets(frame->TextFragment());
|
||
TrimOffsets(offset, length, trimmedOffsets);
|
||
charIndex += offset - untrimmedOffset;
|
||
|
||
// Get the position and rotation of the character that begins this
|
||
// rendered run.
|
||
pt = Root()->mPositions[charIndex].mPosition;
|
||
rotate = Root()->mPositions[charIndex].mAngle;
|
||
|
||
// Determine if we should skip this rendered run.
|
||
bool skip = !mFrameIterator.IsWithinSubtree() ||
|
||
Root()->mPositions[mTextElementCharIndex].mHidden;
|
||
if (mFilter == eVisibleFrames) {
|
||
skip = skip || !frame->StyleVisibility()->IsVisible();
|
||
}
|
||
|
||
// Update our global character index to move past the characters
|
||
// corresponding to this rendered run.
|
||
mTextElementCharIndex += untrimmedLength;
|
||
|
||
// If we have moved past the end of the current frame's content, we need to
|
||
// advance to the next frame.
|
||
if (offset + untrimmedLength >= contentEnd) {
|
||
mFrameIterator.Next();
|
||
mTextElementCharIndex += mFrameIterator.UndisplayedCharacters();
|
||
mFrameStartTextElementCharIndex = mTextElementCharIndex;
|
||
}
|
||
|
||
if (!mFrameIterator.Current()) {
|
||
if (skip) {
|
||
// That was the last frame, and we skipped this rendered run. So we
|
||
// have no rendered run to return.
|
||
mCurrent = TextRenderedRun();
|
||
return mCurrent;
|
||
}
|
||
break;
|
||
}
|
||
|
||
if (length && !skip) {
|
||
// Only return a rendered run if it didn't get collapsed away entirely
|
||
// (due to it being all white space) and if we don't want to skip it.
|
||
break;
|
||
}
|
||
}
|
||
|
||
mCurrent = TextRenderedRun(frame, pt, Root()->mLengthAdjustScaleFactor,
|
||
rotate, mFontSizeScaleFactor, baseline, offset,
|
||
length, charIndex);
|
||
return mCurrent;
|
||
}
|
||
|
||
TextRenderedRun TextRenderedRunIterator::First() {
|
||
if (!mFrameIterator.Current()) {
|
||
return TextRenderedRun();
|
||
}
|
||
|
||
if (Root()->mPositions.IsEmpty()) {
|
||
mFrameIterator.Close();
|
||
return TextRenderedRun();
|
||
}
|
||
|
||
// Get the character index for the start of this rendered run, by skipping
|
||
// any undisplayed characters.
|
||
mTextElementCharIndex = mFrameIterator.UndisplayedCharacters();
|
||
mFrameStartTextElementCharIndex = mTextElementCharIndex;
|
||
|
||
return Next();
|
||
}
|
||
|
||
// -----------------------------------------------------------------------------
|
||
// CharIterator
|
||
|
||
/**
|
||
* Iterator for characters within an SVGTextFrame.
|
||
*/
|
||
class MOZ_STACK_CLASS CharIterator {
|
||
using Range = gfxTextRun::Range;
|
||
|
||
public:
|
||
/**
|
||
* Values for the aFilter argument of the constructor, to indicate which
|
||
* characters we should be iterating over.
|
||
*/
|
||
enum CharacterFilter {
|
||
// Iterate over all original characters from the DOM that are within valid
|
||
// text content elements.
|
||
eOriginal,
|
||
// Iterate only over characters that are not skipped characters.
|
||
eUnskipped,
|
||
// Iterate only over characters that are addressable by the positioning
|
||
// attributes x="", y="", etc. This includes all characters after
|
||
// collapsing white space as required by the value of 'white-space'.
|
||
eAddressable,
|
||
};
|
||
|
||
/**
|
||
* Constructs a CharIterator.
|
||
*
|
||
* @param aSVGTextFrame The SVGTextFrame whose characters to iterate
|
||
* through.
|
||
* @param aFilter Indicates which characters to iterate over.
|
||
* @param aSubtree A content subtree to track whether the current character
|
||
* is within.
|
||
*/
|
||
CharIterator(SVGTextFrame* aSVGTextFrame, CharacterFilter aFilter,
|
||
nsIContent* aSubtree, bool aPostReflow = true);
|
||
|
||
/**
|
||
* Returns whether the iterator is finished.
|
||
*/
|
||
bool AtEnd() const { return !mFrameIterator.Current(); }
|
||
|
||
/**
|
||
* Advances to the next matching character. Returns true if there was a
|
||
* character to advance to, and false otherwise.
|
||
*/
|
||
bool Next();
|
||
|
||
/**
|
||
* Advances ahead aCount matching characters. Returns true if there were
|
||
* enough characters to advance past, and false otherwise.
|
||
*/
|
||
bool Next(uint32_t aCount);
|
||
|
||
/**
|
||
* Advances ahead up to aCount matching characters.
|
||
*/
|
||
void NextWithinSubtree(uint32_t aCount);
|
||
|
||
/**
|
||
* Advances to the character with the specified index. The index is in the
|
||
* space of original characters (i.e., all DOM characters under the <text>
|
||
* that are within valid text content elements).
|
||
*/
|
||
bool AdvanceToCharacter(uint32_t aTextElementCharIndex);
|
||
|
||
/**
|
||
* Advances to the first matching character after the current nsTextFrame.
|
||
*/
|
||
bool AdvancePastCurrentFrame();
|
||
|
||
/**
|
||
* Advances to the first matching character after the frames within
|
||
* the current <textPath>.
|
||
*/
|
||
bool AdvancePastCurrentTextPathFrame();
|
||
|
||
/**
|
||
* Advances to the first matching character of the subtree. Returns true
|
||
* if we successfully advance to the subtree, or if we are already within
|
||
* the subtree. Returns false if we are past the subtree.
|
||
*/
|
||
bool AdvanceToSubtree();
|
||
|
||
/**
|
||
* Returns the nsTextFrame for the current character.
|
||
*/
|
||
nsTextFrame* TextFrame() const { return mFrameIterator.Current(); }
|
||
|
||
/**
|
||
* Returns whether the iterator is within the subtree.
|
||
*/
|
||
bool IsWithinSubtree() const { return mFrameIterator.IsWithinSubtree(); }
|
||
|
||
/**
|
||
* Returns whether the iterator is past the subtree.
|
||
*/
|
||
bool IsAfterSubtree() const { return mFrameIterator.IsAfterSubtree(); }
|
||
|
||
/**
|
||
* Returns whether the current character is a skipped character.
|
||
*/
|
||
bool IsOriginalCharSkipped() const {
|
||
return mSkipCharsIterator.IsOriginalCharSkipped();
|
||
}
|
||
|
||
/**
|
||
* Returns whether the current character is the start of a cluster and
|
||
* ligature group.
|
||
*/
|
||
bool IsClusterAndLigatureGroupStart() const {
|
||
return mTextRun->IsLigatureGroupStart(
|
||
mSkipCharsIterator.GetSkippedOffset()) &&
|
||
mTextRun->IsClusterStart(mSkipCharsIterator.GetSkippedOffset());
|
||
}
|
||
|
||
/**
|
||
* Returns the glyph run for the current character.
|
||
*/
|
||
const gfxTextRun::GlyphRun& GlyphRun() const {
|
||
return *mTextRun->FindFirstGlyphRunContaining(
|
||
mSkipCharsIterator.GetSkippedOffset());
|
||
}
|
||
|
||
/**
|
||
* Returns whether the current character is trimmed away when painting,
|
||
* due to it being leading/trailing white space.
|
||
*/
|
||
bool IsOriginalCharTrimmed() const;
|
||
|
||
/**
|
||
* Returns whether the current character is unaddressable from the SVG glyph
|
||
* positioning attributes.
|
||
*/
|
||
bool IsOriginalCharUnaddressable() const {
|
||
return IsOriginalCharSkipped() || IsOriginalCharTrimmed();
|
||
}
|
||
|
||
/**
|
||
* Returns the text run for the current character.
|
||
*/
|
||
gfxTextRun* TextRun() const { return mTextRun; }
|
||
|
||
/**
|
||
* Returns the current character index.
|
||
*/
|
||
uint32_t TextElementCharIndex() const { return mTextElementCharIndex; }
|
||
|
||
/**
|
||
* Returns the character index for the start of the cluster/ligature group it
|
||
* is part of.
|
||
*/
|
||
uint32_t GlyphStartTextElementCharIndex() const {
|
||
return mGlyphStartTextElementCharIndex;
|
||
}
|
||
|
||
/**
|
||
* Gets the advance, in user units, of the current character. If the
|
||
* character is a part of ligature, then the advance returned will be
|
||
* a fraction of the ligature glyph's advance.
|
||
*
|
||
* @param aContext The context to use for unit conversions.
|
||
*/
|
||
gfxFloat GetAdvance(nsPresContext* aContext) const;
|
||
|
||
/**
|
||
* Returns the frame corresponding to the <textPath> that the current
|
||
* character is within.
|
||
*/
|
||
nsIFrame* TextPathFrame() const { return mFrameIterator.TextPathFrame(); }
|
||
|
||
#ifdef DEBUG
|
||
/**
|
||
* Returns the subtree we were constructed with.
|
||
*/
|
||
nsIContent* GetSubtree() const { return mSubtree; }
|
||
|
||
/**
|
||
* Returns the CharacterFilter mode in use.
|
||
*/
|
||
CharacterFilter Filter() const { return mFilter; }
|
||
#endif
|
||
|
||
private:
|
||
/**
|
||
* Advances to the next character without checking it against the filter.
|
||
* Returns true if there was a next character to advance to, or false
|
||
* otherwise.
|
||
*/
|
||
bool NextCharacter();
|
||
|
||
/**
|
||
* Returns whether the current character matches the filter.
|
||
*/
|
||
bool MatchesFilter() const;
|
||
|
||
/**
|
||
* If this is the start of a glyph, record it.
|
||
*/
|
||
void UpdateGlyphStartTextElementCharIndex() {
|
||
if (!IsOriginalCharSkipped() && IsClusterAndLigatureGroupStart()) {
|
||
mGlyphStartTextElementCharIndex = mTextElementCharIndex;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* The filter to use.
|
||
*/
|
||
CharacterFilter mFilter;
|
||
|
||
/**
|
||
* The iterator for text frames.
|
||
*/
|
||
TextFrameIterator mFrameIterator;
|
||
|
||
#ifdef DEBUG
|
||
/**
|
||
* The subtree we were constructed with.
|
||
*/
|
||
nsIContent* const mSubtree;
|
||
#endif
|
||
|
||
/**
|
||
* A gfxSkipCharsIterator for the text frame the current character is
|
||
* a part of.
|
||
*/
|
||
gfxSkipCharsIterator mSkipCharsIterator;
|
||
|
||
// Cache for information computed by IsOriginalCharTrimmed.
|
||
mutable nsTextFrame* mFrameForTrimCheck;
|
||
mutable uint32_t mTrimmedOffset;
|
||
mutable uint32_t mTrimmedLength;
|
||
|
||
/**
|
||
* The text run the current character is a part of.
|
||
*/
|
||
gfxTextRun* mTextRun;
|
||
|
||
/**
|
||
* The current character's index.
|
||
*/
|
||
uint32_t mTextElementCharIndex;
|
||
|
||
/**
|
||
* The index of the character that starts the cluster/ligature group the
|
||
* current character is a part of.
|
||
*/
|
||
uint32_t mGlyphStartTextElementCharIndex;
|
||
|
||
/**
|
||
* The scale factor to apply to glyph advances returned by
|
||
* GetAdvance etc. to take into account textLength="".
|
||
*/
|
||
float mLengthAdjustScaleFactor;
|
||
|
||
/**
|
||
* Whether the instance of this class is being used after reflow has occurred
|
||
* or not.
|
||
*/
|
||
bool mPostReflow;
|
||
};
|
||
|
||
CharIterator::CharIterator(SVGTextFrame* aSVGTextFrame,
|
||
CharIterator::CharacterFilter aFilter,
|
||
nsIContent* aSubtree, bool aPostReflow)
|
||
: mFilter(aFilter),
|
||
mFrameIterator(aSVGTextFrame, aSubtree),
|
||
#ifdef DEBUG
|
||
mSubtree(aSubtree),
|
||
#endif
|
||
mFrameForTrimCheck(nullptr),
|
||
mTrimmedOffset(0),
|
||
mTrimmedLength(0),
|
||
mTextRun(nullptr),
|
||
mTextElementCharIndex(0),
|
||
mGlyphStartTextElementCharIndex(0),
|
||
mLengthAdjustScaleFactor(aSVGTextFrame->mLengthAdjustScaleFactor),
|
||
mPostReflow(aPostReflow) {
|
||
if (!AtEnd()) {
|
||
mSkipCharsIterator = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
||
mTextRun = TextFrame()->GetTextRun(nsTextFrame::eInflated);
|
||
mTextElementCharIndex = mFrameIterator.UndisplayedCharacters();
|
||
UpdateGlyphStartTextElementCharIndex();
|
||
if (!MatchesFilter()) {
|
||
Next();
|
||
}
|
||
}
|
||
}
|
||
|
||
bool CharIterator::Next() {
|
||
while (NextCharacter()) {
|
||
if (MatchesFilter()) {
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool CharIterator::Next(uint32_t aCount) {
|
||
if (aCount == 0 && AtEnd()) {
|
||
return false;
|
||
}
|
||
while (aCount) {
|
||
if (!Next()) {
|
||
return false;
|
||
}
|
||
aCount--;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
void CharIterator::NextWithinSubtree(uint32_t aCount) {
|
||
while (IsWithinSubtree() && aCount) {
|
||
--aCount;
|
||
if (!Next()) {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
bool CharIterator::AdvanceToCharacter(uint32_t aTextElementCharIndex) {
|
||
while (mTextElementCharIndex < aTextElementCharIndex) {
|
||
if (!Next()) {
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
bool CharIterator::AdvancePastCurrentFrame() {
|
||
// XXX Can do this better than one character at a time if it matters.
|
||
nsTextFrame* currentFrame = TextFrame();
|
||
do {
|
||
if (!Next()) {
|
||
return false;
|
||
}
|
||
} while (TextFrame() == currentFrame);
|
||
return true;
|
||
}
|
||
|
||
bool CharIterator::AdvancePastCurrentTextPathFrame() {
|
||
nsIFrame* currentTextPathFrame = TextPathFrame();
|
||
NS_ASSERTION(currentTextPathFrame,
|
||
"expected AdvancePastCurrentTextPathFrame to be called only "
|
||
"within a text path frame");
|
||
do {
|
||
if (!AdvancePastCurrentFrame()) {
|
||
return false;
|
||
}
|
||
} while (TextPathFrame() == currentTextPathFrame);
|
||
return true;
|
||
}
|
||
|
||
bool CharIterator::AdvanceToSubtree() {
|
||
while (!IsWithinSubtree()) {
|
||
if (IsAfterSubtree()) {
|
||
return false;
|
||
}
|
||
if (!AdvancePastCurrentFrame()) {
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
bool CharIterator::IsOriginalCharTrimmed() const {
|
||
if (mFrameForTrimCheck != TextFrame()) {
|
||
// Since we do a lot of trim checking, we cache the trimmed offsets and
|
||
// lengths while we are in the same frame.
|
||
mFrameForTrimCheck = TextFrame();
|
||
uint32_t offset = mFrameForTrimCheck->GetContentOffset();
|
||
uint32_t length = mFrameForTrimCheck->GetContentLength();
|
||
nsTextFrame::TrimmedOffsets trim = mFrameForTrimCheck->GetTrimmedOffsets(
|
||
mFrameForTrimCheck->TextFragment(),
|
||
(mPostReflow ? nsTextFrame::TrimmedOffsetFlags::Default
|
||
: nsTextFrame::TrimmedOffsetFlags::NotPostReflow));
|
||
TrimOffsets(offset, length, trim);
|
||
mTrimmedOffset = offset;
|
||
mTrimmedLength = length;
|
||
}
|
||
|
||
// A character is trimmed if it is outside the mTrimmedOffset/mTrimmedLength
|
||
// range and it is not a significant newline character.
|
||
uint32_t index = mSkipCharsIterator.GetOriginalOffset();
|
||
return !(
|
||
(index >= mTrimmedOffset && index < mTrimmedOffset + mTrimmedLength) ||
|
||
(index >= mTrimmedOffset + mTrimmedLength &&
|
||
mFrameForTrimCheck->StyleText()->NewlineIsSignificant(
|
||
mFrameForTrimCheck) &&
|
||
mFrameForTrimCheck->TextFragment()->CharAt(index) == '\n'));
|
||
}
|
||
|
||
gfxFloat CharIterator::GetAdvance(nsPresContext* aContext) const {
|
||
float cssPxPerDevPx =
|
||
nsPresContext::AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
|
||
|
||
gfxSkipCharsIterator start =
|
||
TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(TextFrame(), start);
|
||
|
||
uint32_t offset = mSkipCharsIterator.GetSkippedOffset();
|
||
gfxFloat advance =
|
||
mTextRun->GetAdvanceWidth(Range(offset, offset + 1), &provider);
|
||
return aContext->AppUnitsToGfxUnits(advance) * mLengthAdjustScaleFactor *
|
||
cssPxPerDevPx;
|
||
}
|
||
|
||
bool CharIterator::NextCharacter() {
|
||
if (AtEnd()) {
|
||
return false;
|
||
}
|
||
|
||
mTextElementCharIndex++;
|
||
|
||
// Advance within the current text run.
|
||
mSkipCharsIterator.AdvanceOriginal(1);
|
||
if (mSkipCharsIterator.GetOriginalOffset() < TextFrame()->GetContentEnd()) {
|
||
// We're still within the part of the text run for the current text frame.
|
||
UpdateGlyphStartTextElementCharIndex();
|
||
return true;
|
||
}
|
||
|
||
// Advance to the next frame.
|
||
mFrameIterator.Next();
|
||
|
||
// Skip any undisplayed characters.
|
||
uint32_t undisplayed = mFrameIterator.UndisplayedCharacters();
|
||
mTextElementCharIndex += undisplayed;
|
||
if (!TextFrame()) {
|
||
// We're at the end.
|
||
mSkipCharsIterator = gfxSkipCharsIterator();
|
||
return false;
|
||
}
|
||
|
||
mSkipCharsIterator = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
|
||
mTextRun = TextFrame()->GetTextRun(nsTextFrame::eInflated);
|
||
UpdateGlyphStartTextElementCharIndex();
|
||
return true;
|
||
}
|
||
|
||
bool CharIterator::MatchesFilter() const {
|
||
switch (mFilter) {
|
||
case eOriginal:
|
||
return true;
|
||
case eUnskipped:
|
||
return !IsOriginalCharSkipped();
|
||
case eAddressable:
|
||
return !IsOriginalCharSkipped() && !IsOriginalCharUnaddressable();
|
||
}
|
||
MOZ_ASSERT_UNREACHABLE("Invalid mFilter value");
|
||
return true;
|
||
}
|
||
|
||
// -----------------------------------------------------------------------------
|
||
// SVGTextDrawPathCallbacks
|
||
|
||
/**
|
||
* Text frame draw callback class that paints the text and text decoration parts
|
||
* of an nsTextFrame using SVG painting properties, and selection backgrounds
|
||
* and decorations as they would normally.
|
||
*
|
||
* An instance of this class is passed to nsTextFrame::PaintText if painting
|
||
* cannot be done directly (e.g. if we are using an SVG pattern fill, stroking
|
||
* the text, etc.).
|
||
*/
|
||
class SVGTextDrawPathCallbacks final : public nsTextFrame::DrawPathCallbacks {
|
||
using imgDrawingParams = image::imgDrawingParams;
|
||
|
||
public:
|
||
/**
|
||
* Constructs an SVGTextDrawPathCallbacks.
|
||
*
|
||
* @param aSVGTextFrame The ancestor text frame.
|
||
* @param aContext The context to use for painting.
|
||
* @param aFrame The nsTextFrame to paint.
|
||
* @param aCanvasTM The transformation matrix to set when painting; this
|
||
* should be the FOR_OUTERSVG_TM canvas TM of the text, so that
|
||
* paint servers are painted correctly.
|
||
* @param aImgParams Whether we need to synchronously decode images.
|
||
* @param aShouldPaintSVGGlyphs Whether SVG glyphs should be painted.
|
||
*/
|
||
SVGTextDrawPathCallbacks(SVGTextFrame* aSVGTextFrame, gfxContext& aContext,
|
||
nsTextFrame* aFrame, const gfxMatrix& aCanvasTM,
|
||
imgDrawingParams& aImgParams,
|
||
bool aShouldPaintSVGGlyphs)
|
||
: DrawPathCallbacks(aShouldPaintSVGGlyphs),
|
||
mSVGTextFrame(aSVGTextFrame),
|
||
mContext(aContext),
|
||
mFrame(aFrame),
|
||
mCanvasTM(aCanvasTM),
|
||
mImgParams(aImgParams) {}
|
||
|
||
void NotifySelectionBackgroundNeedsFill(const Rect& aBackgroundRect,
|
||
nscolor aColor,
|
||
DrawTarget& aDrawTarget) override;
|
||
void PaintDecorationLine(Rect aPath, bool aPaintingShadows,
|
||
nscolor aColor) override;
|
||
void PaintSelectionDecorationLine(Rect aPath, bool aPaintingShadows,
|
||
nscolor aColor) override;
|
||
void NotifyBeforeText(bool aPaintingShadows, nscolor aColor) override;
|
||
void NotifyGlyphPathEmitted() override;
|
||
void NotifyAfterText() override;
|
||
|
||
private:
|
||
void SetupContext();
|
||
|
||
bool IsClipPathChild() const {
|
||
return mSVGTextFrame->HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD);
|
||
}
|
||
|
||
/**
|
||
* Paints a piece of text geometry. This is called when glyphs
|
||
* or text decorations have been emitted to the gfxContext.
|
||
*/
|
||
void HandleTextGeometry();
|
||
|
||
/**
|
||
* Sets the gfxContext paint to the appropriate color or pattern
|
||
* for filling text geometry.
|
||
*/
|
||
void MakeFillPattern(GeneralPattern* aOutPattern);
|
||
|
||
/**
|
||
* Fills and strokes a piece of text geometry, using group opacity
|
||
* if the selection style requires it.
|
||
*/
|
||
void FillAndStrokeGeometry();
|
||
|
||
/**
|
||
* Fills a piece of text geometry.
|
||
*/
|
||
void FillGeometry();
|
||
|
||
/**
|
||
* Strokes a piece of text geometry.
|
||
*/
|
||
void StrokeGeometry();
|
||
|
||
/*
|
||
* Takes a colour and modifies it to account for opacity properties.
|
||
*/
|
||
void ApplyOpacity(sRGBColor& aColor, const StyleSVGPaint& aPaint,
|
||
const StyleSVGOpacity& aOpacity) const;
|
||
|
||
SVGTextFrame* const mSVGTextFrame;
|
||
gfxContext& mContext;
|
||
nsTextFrame* const mFrame;
|
||
const gfxMatrix& mCanvasTM;
|
||
imgDrawingParams& mImgParams;
|
||
|
||
/**
|
||
* The color that we were last told from one of the path callback functions.
|
||
* This color can be the special NS_SAME_AS_FOREGROUND_COLOR,
|
||
* NS_40PERCENT_FOREGROUND_COLOR and NS_TRANSPARENT colors when we are
|
||
* painting selections or IME decorations.
|
||
*/
|
||
nscolor mColor = NS_RGBA(0, 0, 0, 0);
|
||
|
||
/**
|
||
* Whether we're painting text shadows.
|
||
*/
|
||
bool mPaintingShadows = false;
|
||
};
|
||
|
||
void SVGTextDrawPathCallbacks::NotifySelectionBackgroundNeedsFill(
|
||
const Rect& aBackgroundRect, nscolor aColor, DrawTarget& aDrawTarget) {
|
||
if (IsClipPathChild()) {
|
||
// Don't paint selection backgrounds when in a clip path.
|
||
return;
|
||
}
|
||
|
||
mColor = aColor; // currently needed by MakeFillPattern
|
||
mPaintingShadows = false;
|
||
|
||
GeneralPattern fillPattern;
|
||
MakeFillPattern(&fillPattern);
|
||
if (fillPattern.GetPattern()) {
|
||
DrawOptions drawOptions(aColor == NS_40PERCENT_FOREGROUND_COLOR ? 0.4
|
||
: 1.0);
|
||
aDrawTarget.FillRect(aBackgroundRect, fillPattern, drawOptions);
|
||
}
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::NotifyBeforeText(bool aPaintingShadows,
|
||
nscolor aColor) {
|
||
mColor = aColor;
|
||
mPaintingShadows = aPaintingShadows;
|
||
SetupContext();
|
||
mContext.NewPath();
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::NotifyGlyphPathEmitted() {
|
||
HandleTextGeometry();
|
||
mContext.NewPath();
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::NotifyAfterText() { mContext.Restore(); }
|
||
|
||
void SVGTextDrawPathCallbacks::PaintDecorationLine(Rect aPath,
|
||
bool aPaintingShadows,
|
||
nscolor aColor) {
|
||
mColor = aColor;
|
||
mPaintingShadows = aPaintingShadows;
|
||
AntialiasMode aaMode =
|
||
SVGUtils::ToAntialiasMode(mFrame->StyleText()->mTextRendering);
|
||
|
||
mContext.Save();
|
||
mContext.NewPath();
|
||
mContext.SetAntialiasMode(aaMode);
|
||
mContext.Rectangle(ThebesRect(aPath));
|
||
HandleTextGeometry();
|
||
mContext.NewPath();
|
||
mContext.Restore();
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::PaintSelectionDecorationLine(
|
||
Rect aPath, bool aPaintingShadows, nscolor aColor) {
|
||
if (IsClipPathChild()) {
|
||
// Don't paint selection decorations when in a clip path.
|
||
return;
|
||
}
|
||
|
||
mColor = aColor;
|
||
mPaintingShadows = aPaintingShadows;
|
||
|
||
mContext.Save();
|
||
mContext.NewPath();
|
||
mContext.Rectangle(ThebesRect(aPath));
|
||
FillAndStrokeGeometry();
|
||
mContext.Restore();
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::SetupContext() {
|
||
mContext.Save();
|
||
|
||
// XXX This is copied from nsSVGGlyphFrame::Render, but cairo doesn't actually
|
||
// seem to do anything with the antialias mode. So we can perhaps remove it,
|
||
// or make SetAntialiasMode set cairo text antialiasing too.
|
||
mContext.SetAntialiasMode(
|
||
SVGUtils::ToAntialiasMode(mFrame->StyleText()->mTextRendering));
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::HandleTextGeometry() {
|
||
if (IsClipPathChild()) {
|
||
RefPtr<Path> path = mContext.GetPath();
|
||
ColorPattern white(
|
||
DeviceColor(1.f, 1.f, 1.f, 1.f)); // for masking, so no ToDeviceColor
|
||
mContext.GetDrawTarget()->Fill(path, white);
|
||
} else {
|
||
// Normal painting.
|
||
gfxContextMatrixAutoSaveRestore saveMatrix(&mContext);
|
||
mContext.SetMatrixDouble(mCanvasTM);
|
||
|
||
FillAndStrokeGeometry();
|
||
}
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::ApplyOpacity(
|
||
sRGBColor& aColor, const StyleSVGPaint& aPaint,
|
||
const StyleSVGOpacity& aOpacity) const {
|
||
if (aPaint.kind.tag == StyleSVGPaintKind::Tag::Color) {
|
||
aColor.a *=
|
||
sRGBColor::FromABGR(aPaint.kind.AsColor().CalcColor(*mFrame->Style()))
|
||
.a;
|
||
}
|
||
aColor.a *= SVGUtils::GetOpacity(aOpacity, /*aContextPaint*/ nullptr);
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::MakeFillPattern(GeneralPattern* aOutPattern) {
|
||
if (mColor == NS_SAME_AS_FOREGROUND_COLOR ||
|
||
mColor == NS_40PERCENT_FOREGROUND_COLOR) {
|
||
SVGUtils::MakeFillPatternFor(mFrame, &mContext, aOutPattern, mImgParams);
|
||
return;
|
||
}
|
||
|
||
if (mColor == NS_TRANSPARENT) {
|
||
return;
|
||
}
|
||
|
||
sRGBColor color(sRGBColor::FromABGR(mColor));
|
||
if (mPaintingShadows) {
|
||
ApplyOpacity(color, mFrame->StyleSVG()->mFill,
|
||
mFrame->StyleSVG()->mFillOpacity);
|
||
}
|
||
aOutPattern->InitColorPattern(ToDeviceColor(color));
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::FillAndStrokeGeometry() {
|
||
gfxGroupForBlendAutoSaveRestore autoGroupForBlend(&mContext);
|
||
if (mColor == NS_40PERCENT_FOREGROUND_COLOR) {
|
||
autoGroupForBlend.PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, 0.4f);
|
||
}
|
||
|
||
uint32_t paintOrder = mFrame->StyleSVG()->mPaintOrder;
|
||
if (!paintOrder) {
|
||
FillGeometry();
|
||
StrokeGeometry();
|
||
} else {
|
||
while (paintOrder) {
|
||
auto component = StylePaintOrder(paintOrder & kPaintOrderMask);
|
||
switch (component) {
|
||
case StylePaintOrder::Fill:
|
||
FillGeometry();
|
||
break;
|
||
case StylePaintOrder::Stroke:
|
||
StrokeGeometry();
|
||
break;
|
||
default:
|
||
MOZ_FALLTHROUGH_ASSERT("Unknown paint-order value");
|
||
case StylePaintOrder::Markers:
|
||
case StylePaintOrder::Normal:
|
||
break;
|
||
}
|
||
paintOrder >>= kPaintOrderShift;
|
||
}
|
||
}
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::FillGeometry() {
|
||
if (mFrame->StyleSVG()->mFill.kind.IsNone()) {
|
||
return;
|
||
}
|
||
GeneralPattern fillPattern;
|
||
MakeFillPattern(&fillPattern);
|
||
if (fillPattern.GetPattern()) {
|
||
RefPtr<Path> path = mContext.GetPath();
|
||
FillRule fillRule = SVGUtils::ToFillRule(mFrame->StyleSVG()->mFillRule);
|
||
if (fillRule != path->GetFillRule()) {
|
||
Path::SetFillRule(path, fillRule);
|
||
}
|
||
mContext.GetDrawTarget()->Fill(path, fillPattern);
|
||
}
|
||
}
|
||
|
||
void SVGTextDrawPathCallbacks::StrokeGeometry() {
|
||
// We don't paint the stroke when we are filling with a selection color.
|
||
if (!(mColor == NS_SAME_AS_FOREGROUND_COLOR ||
|
||
mColor == NS_40PERCENT_FOREGROUND_COLOR || mPaintingShadows)) {
|
||
return;
|
||
}
|
||
|
||
if (!SVGUtils::HasStroke(mFrame, /*aContextPaint*/ nullptr)) {
|
||
return;
|
||
}
|
||
|
||
GeneralPattern strokePattern;
|
||
if (mPaintingShadows) {
|
||
sRGBColor color(sRGBColor::FromABGR(mColor));
|
||
ApplyOpacity(color, mFrame->StyleSVG()->mStroke,
|
||
mFrame->StyleSVG()->mStrokeOpacity);
|
||
strokePattern.InitColorPattern(ToDeviceColor(color));
|
||
} else {
|
||
SVGUtils::MakeStrokePatternFor(mFrame, &mContext, &strokePattern,
|
||
mImgParams, /*aContextPaint*/ nullptr);
|
||
}
|
||
if (strokePattern.GetPattern()) {
|
||
SVGElement* svgOwner =
|
||
SVGElement::FromNode(mFrame->GetParent()->GetContent());
|
||
|
||
// Apply any stroke-specific transform
|
||
gfxMatrix outerSVGToUser;
|
||
if (SVGUtils::GetNonScalingStrokeTransform(mFrame, &outerSVGToUser) &&
|
||
outerSVGToUser.Invert()) {
|
||
mContext.Multiply(outerSVGToUser);
|
||
}
|
||
|
||
RefPtr<Path> path = mContext.GetPath();
|
||
SVGContentUtils::AutoStrokeOptions strokeOptions;
|
||
SVGContentUtils::GetStrokeOptions(&strokeOptions, svgOwner, mFrame->Style(),
|
||
/*aContextPaint*/ nullptr);
|
||
DrawOptions drawOptions;
|
||
drawOptions.mAntialiasMode =
|
||
SVGUtils::ToAntialiasMode(mFrame->StyleText()->mTextRendering);
|
||
mContext.GetDrawTarget()->Stroke(path, strokePattern, strokeOptions);
|
||
}
|
||
}
|
||
|
||
// ============================================================================
|
||
// SVGTextFrame
|
||
|
||
// ----------------------------------------------------------------------------
|
||
// Display list item
|
||
|
||
class DisplaySVGText final : public DisplaySVGItem {
|
||
public:
|
||
DisplaySVGText(nsDisplayListBuilder* aBuilder, SVGTextFrame* aFrame)
|
||
: DisplaySVGItem(aBuilder, aFrame) {
|
||
MOZ_COUNT_CTOR(DisplaySVGText);
|
||
}
|
||
|
||
MOZ_COUNTED_DTOR_FINAL(DisplaySVGText)
|
||
|
||
NS_DISPLAY_DECL_NAME("DisplaySVGText", TYPE_SVG_TEXT)
|
||
|
||
nsDisplayItemGeometry* AllocateGeometry(
|
||
nsDisplayListBuilder* aBuilder) override {
|
||
return new nsDisplayItemGenericGeometry(this, aBuilder);
|
||
}
|
||
|
||
nsRect GetComponentAlphaBounds(
|
||
nsDisplayListBuilder* aBuilder) const override {
|
||
bool snap;
|
||
return GetBounds(aBuilder, &snap);
|
||
}
|
||
};
|
||
|
||
// ---------------------------------------------------------------------
|
||
// nsQueryFrame methods
|
||
|
||
NS_QUERYFRAME_HEAD(SVGTextFrame)
|
||
NS_QUERYFRAME_ENTRY(SVGTextFrame)
|
||
NS_QUERYFRAME_TAIL_INHERITING(SVGDisplayContainerFrame)
|
||
|
||
} // namespace mozilla
|
||
|
||
// ---------------------------------------------------------------------
|
||
// Implementation
|
||
|
||
nsIFrame* NS_NewSVGTextFrame(mozilla::PresShell* aPresShell,
|
||
mozilla::ComputedStyle* aStyle) {
|
||
return new (aPresShell)
|
||
mozilla::SVGTextFrame(aStyle, aPresShell->GetPresContext());
|
||
}
|
||
|
||
namespace mozilla {
|
||
|
||
NS_IMPL_FRAMEARENA_HELPERS(SVGTextFrame)
|
||
|
||
// ---------------------------------------------------------------------
|
||
// nsIFrame methods
|
||
|
||
void SVGTextFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
|
||
nsIFrame* aPrevInFlow) {
|
||
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::text),
|
||
"Content is not an SVG text");
|
||
|
||
SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
|
||
AddStateBits(aParent->GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD);
|
||
|
||
mMutationObserver = new MutationObserver(this);
|
||
|
||
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
// We're inserting a new <text> element into a non-display context.
|
||
// Ensure that we get reflowed.
|
||
ScheduleReflowSVGNonDisplayText(
|
||
IntrinsicDirty::FrameAncestorsAndDescendants);
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
||
const nsDisplayListSet& aLists) {
|
||
if (IsSubtreeDirty()) {
|
||
// We can sometimes be asked to paint before reflow happens and we
|
||
// have updated mPositions, etc. In this case, we just avoid
|
||
// painting.
|
||
return;
|
||
}
|
||
if (!IsVisibleForPainting() && aBuilder->IsForPainting()) {
|
||
return;
|
||
}
|
||
DisplayOutline(aBuilder, aLists);
|
||
aLists.Content()->AppendNewToTop<DisplaySVGText>(aBuilder, this);
|
||
}
|
||
|
||
void SVGTextFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
|
||
SVGDisplayContainerFrame::DidSetComputedStyle(aOldComputedStyle);
|
||
if (StyleSVGReset()->HasNonScalingStroke() &&
|
||
(!aOldComputedStyle ||
|
||
!aOldComputedStyle->StyleSVGReset()->HasNonScalingStroke())) {
|
||
SVGUtils::UpdateNonScalingStrokeStateBit(this);
|
||
}
|
||
}
|
||
|
||
nsresult SVGTextFrame::AttributeChanged(int32_t aNameSpaceID,
|
||
nsAtom* aAttribute, int32_t aModType) {
|
||
if (aNameSpaceID != kNameSpaceID_None) {
|
||
return NS_OK;
|
||
}
|
||
|
||
if (aAttribute == nsGkAtoms::transform) {
|
||
// We don't invalidate for transform changes (the layers code does that).
|
||
// Also note that SVGTransformableElement::GetAttributeChangeHint will
|
||
// return nsChangeHint_UpdateOverflow for "transform" attribute changes
|
||
// and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
|
||
|
||
if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW) && mCanvasTM &&
|
||
mCanvasTM->IsSingular()) {
|
||
// We won't have calculated the glyph positions correctly.
|
||
NotifyGlyphMetricsChange(false);
|
||
}
|
||
mCanvasTM = nullptr;
|
||
} else if (IsGlyphPositioningAttribute(aAttribute) ||
|
||
aAttribute == nsGkAtoms::textLength ||
|
||
aAttribute == nsGkAtoms::lengthAdjust) {
|
||
NotifyGlyphMetricsChange(false);
|
||
}
|
||
|
||
return NS_OK;
|
||
}
|
||
|
||
void SVGTextFrame::ReflowSVGNonDisplayText() {
|
||
MOZ_ASSERT(SVGUtils::AnyOuterSVGIsCallingReflowSVG(this),
|
||
"only call ReflowSVGNonDisplayText when an outer SVG frame is "
|
||
"under ReflowSVG");
|
||
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
|
||
"only call ReflowSVGNonDisplayText if the frame is "
|
||
"NS_FRAME_IS_NONDISPLAY");
|
||
|
||
// We had a style change, so we mark this frame as dirty so that the next
|
||
// time it is painted, we reflow the anonymous block frame.
|
||
this->MarkSubtreeDirty();
|
||
|
||
// Finally, we need to actually reflow the anonymous block frame and update
|
||
// mPositions, in case we are being reflowed immediately after a DOM
|
||
// mutation that needs frame reconstruction.
|
||
MaybeReflowAnonymousBlockChild();
|
||
UpdateGlyphPositioning();
|
||
}
|
||
|
||
void SVGTextFrame::ScheduleReflowSVGNonDisplayText(IntrinsicDirty aReason) {
|
||
MOZ_ASSERT(!SVGUtils::OuterSVGIsCallingReflowSVG(this),
|
||
"do not call ScheduleReflowSVGNonDisplayText when the outer SVG "
|
||
"frame is under ReflowSVG");
|
||
MOZ_ASSERT(!HasAnyStateBits(NS_STATE_SVG_TEXT_IN_REFLOW),
|
||
"do not call ScheduleReflowSVGNonDisplayText while reflowing the "
|
||
"anonymous block child");
|
||
|
||
// We need to find an ancestor frame that we can call FrameNeedsReflow
|
||
// on that will cause the document to be marked as needing relayout,
|
||
// and for that ancestor (or some further ancestor) to be marked as
|
||
// a root to reflow. We choose the closest ancestor frame that is not
|
||
// NS_FRAME_IS_NONDISPLAY and which is either an outer SVG frame or a
|
||
// non-SVG frame. (We don't consider displayed SVG frame ancestors other
|
||
// than SVGOuterSVGFrame, since calling FrameNeedsReflow on those other
|
||
// SVG frames would do a bunch of unnecessary work on the SVG frames up to
|
||
// the SVGOuterSVGFrame.)
|
||
|
||
nsIFrame* f = this;
|
||
while (f) {
|
||
if (!f->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
if (f->IsSubtreeDirty()) {
|
||
// This is a displayed frame, so if it is already dirty, we will be
|
||
// reflowed soon anyway. No need to call FrameNeedsReflow again, then.
|
||
return;
|
||
}
|
||
if (!f->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
|
||
break;
|
||
}
|
||
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
|
||
}
|
||
f = f->GetParent();
|
||
}
|
||
|
||
MOZ_ASSERT(f, "should have found an ancestor frame to reflow");
|
||
|
||
PresShell()->FrameNeedsReflow(f, aReason, NS_FRAME_IS_DIRTY);
|
||
}
|
||
|
||
NS_IMPL_ISUPPORTS(SVGTextFrame::MutationObserver, nsIMutationObserver)
|
||
|
||
void SVGTextFrame::MutationObserver::ContentAppended(
|
||
nsIContent* aFirstNewContent) {
|
||
mFrame->NotifyGlyphMetricsChange(true);
|
||
}
|
||
|
||
void SVGTextFrame::MutationObserver::ContentInserted(nsIContent* aChild) {
|
||
mFrame->NotifyGlyphMetricsChange(true);
|
||
}
|
||
|
||
void SVGTextFrame::MutationObserver::ContentWillBeRemoved(
|
||
nsIContent* aChild, const BatchRemovalState* aState) {
|
||
if (aState && !aState->mIsFirst) {
|
||
return;
|
||
}
|
||
mFrame->NotifyGlyphMetricsChange(true);
|
||
}
|
||
|
||
void SVGTextFrame::MutationObserver::CharacterDataChanged(
|
||
nsIContent* aContent, const CharacterDataChangeInfo&) {
|
||
mFrame->NotifyGlyphMetricsChange(true);
|
||
}
|
||
|
||
void SVGTextFrame::MutationObserver::AttributeChanged(
|
||
Element* aElement, int32_t aNameSpaceID, nsAtom* aAttribute,
|
||
int32_t aModType, const nsAttrValue* aOldValue) {
|
||
if (!aElement->IsSVGElement()) {
|
||
return;
|
||
}
|
||
|
||
// Attribute changes on this element will be handled by
|
||
// SVGTextFrame::AttributeChanged.
|
||
if (aElement == mFrame->GetContent()) {
|
||
return;
|
||
}
|
||
|
||
mFrame->HandleAttributeChangeInDescendant(aElement, aNameSpaceID, aAttribute);
|
||
}
|
||
|
||
void SVGTextFrame::HandleAttributeChangeInDescendant(Element* aElement,
|
||
int32_t aNameSpaceID,
|
||
nsAtom* aAttribute) {
|
||
if (aElement->IsSVGElement(nsGkAtoms::textPath)) {
|
||
if (aNameSpaceID == kNameSpaceID_None &&
|
||
(aAttribute == nsGkAtoms::startOffset ||
|
||
aAttribute == nsGkAtoms::path || aAttribute == nsGkAtoms::side)) {
|
||
NotifyGlyphMetricsChange(false);
|
||
} else if ((aNameSpaceID == kNameSpaceID_XLink ||
|
||
aNameSpaceID == kNameSpaceID_None) &&
|
||
aAttribute == nsGkAtoms::href) {
|
||
// Blow away our reference, if any
|
||
nsIFrame* childElementFrame = aElement->GetPrimaryFrame();
|
||
if (childElementFrame) {
|
||
SVGObserverUtils::RemoveTextPathObserver(childElementFrame);
|
||
NotifyGlyphMetricsChange(false);
|
||
}
|
||
}
|
||
} else {
|
||
if (aNameSpaceID == kNameSpaceID_None &&
|
||
IsGlyphPositioningAttribute(aAttribute)) {
|
||
NotifyGlyphMetricsChange(false);
|
||
}
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::FindCloserFrameForSelection(
|
||
const nsPoint& aPoint, FrameWithDistance* aCurrentBestFrame) {
|
||
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
return;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
// Find the frame that has the closest rendered run rect to aPoint.
|
||
TextRenderedRunIterator it(this);
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
uint32_t flags = TextRenderedRun::eIncludeFill |
|
||
TextRenderedRun::eIncludeStroke |
|
||
TextRenderedRun::eNoHorizontalOverflow;
|
||
SVGBBox userRect = run.GetUserSpaceRect(presContext, flags);
|
||
float devPxPerCSSPx = presContext->CSSPixelsToDevPixels(1.f);
|
||
userRect.Scale(devPxPerCSSPx);
|
||
|
||
if (!userRect.IsEmpty()) {
|
||
gfxMatrix m;
|
||
nsRect rect =
|
||
SVGUtils::ToCanvasBounds(userRect.ToThebesRect(), m, presContext);
|
||
|
||
if (nsLayoutUtils::PointIsCloserToRect(aPoint, rect,
|
||
aCurrentBestFrame->mXDistance,
|
||
aCurrentBestFrame->mYDistance)) {
|
||
aCurrentBestFrame->mFrame = run.mFrame;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// ISVGDisplayableFrame methods
|
||
|
||
void SVGTextFrame::NotifySVGChanged(uint32_t aFlags) {
|
||
MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
|
||
"Invalidation logic may need adjusting");
|
||
|
||
bool needNewBounds = false;
|
||
bool needGlyphMetricsUpdate = false;
|
||
if ((aFlags & COORD_CONTEXT_CHANGED) &&
|
||
HasAnyStateBits(NS_STATE_SVG_POSITIONING_MAY_USE_PERCENTAGES)) {
|
||
needGlyphMetricsUpdate = true;
|
||
}
|
||
|
||
if (aFlags & TRANSFORM_CHANGED) {
|
||
if (mCanvasTM && mCanvasTM->IsSingular()) {
|
||
// We won't have calculated the glyph positions correctly.
|
||
needNewBounds = true;
|
||
needGlyphMetricsUpdate = true;
|
||
}
|
||
mCanvasTM = nullptr;
|
||
if (StyleSVGReset()->HasNonScalingStroke()) {
|
||
// Stroke currently contributes to our mRect, and our stroke depends on
|
||
// the transform to our outer-<svg> if |vector-effect:non-scaling-stroke|.
|
||
needNewBounds = true;
|
||
}
|
||
|
||
// If the scale at which we computed our mFontSizeScaleFactor has changed by
|
||
// at least a factor of two, reflow the text. This avoids reflowing text at
|
||
// every tick of a transform animation, but ensures our glyph metrics
|
||
// do not get too far out of sync with the final font size on the screen.
|
||
const float scale = GetContextScale(this);
|
||
if (scale != mLastContextScale) {
|
||
if (mLastContextScale == 0.0f) {
|
||
needNewBounds = true;
|
||
needGlyphMetricsUpdate = true;
|
||
} else {
|
||
float change = scale / mLastContextScale;
|
||
if (change >= 2.0f || change <= 0.5f) {
|
||
needNewBounds = true;
|
||
needGlyphMetricsUpdate = true;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (needNewBounds) {
|
||
// Ancestor changes can't affect how we render from the perspective of
|
||
// any rendering observers that we may have, so we don't need to
|
||
// invalidate them. We also don't need to invalidate ourself, since our
|
||
// changed ancestor will have invalidated its entire area, which includes
|
||
// our area.
|
||
ScheduleReflowSVG();
|
||
}
|
||
|
||
if (needGlyphMetricsUpdate) {
|
||
// If we are positioned using percentage values we need to update our
|
||
// position whenever our viewport's dimensions change. But only do this if
|
||
// we have been reflowed once, otherwise the glyph positioning will be
|
||
// wrong. (We need to wait until bidi reordering has been done.)
|
||
if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
|
||
NotifyGlyphMetricsChange(false);
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Gets the offset into a DOM node that the specified caret is positioned at.
|
||
*/
|
||
static int32_t GetCaretOffset(nsCaret* aCaret) {
|
||
RefPtr<Selection> selection = aCaret->GetSelection();
|
||
if (!selection) {
|
||
return -1;
|
||
}
|
||
|
||
return selection->AnchorOffset();
|
||
}
|
||
|
||
/**
|
||
* Returns whether the caret should be painted for a given TextRenderedRun
|
||
* by checking whether the caret is in the range covered by the rendered run.
|
||
*
|
||
* @param aThisRun The TextRenderedRun to be painted.
|
||
* @param aCaret The caret.
|
||
*/
|
||
static bool ShouldPaintCaret(const TextRenderedRun& aThisRun, nsCaret* aCaret) {
|
||
int32_t caretOffset = GetCaretOffset(aCaret);
|
||
|
||
if (caretOffset < 0) {
|
||
return false;
|
||
}
|
||
|
||
return uint32_t(caretOffset) >= aThisRun.mTextFrameContentOffset &&
|
||
uint32_t(caretOffset) < aThisRun.mTextFrameContentOffset +
|
||
aThisRun.mTextFrameContentLength;
|
||
}
|
||
|
||
void SVGTextFrame::PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
|
||
imgDrawingParams& aImgParams) {
|
||
DrawTarget& aDrawTarget = *aContext.GetDrawTarget();
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (!kid) {
|
||
return;
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
// If we are in a canvas DrawWindow call that used the
|
||
// DRAWWINDOW_DO_NOT_FLUSH flag, then we may still have out
|
||
// of date frames. Just don't paint anything if they are
|
||
// dirty.
|
||
if (presContext->PresShell()->InDrawWindowNotFlushing() &&
|
||
IsSubtreeDirty()) {
|
||
return;
|
||
}
|
||
// Text frames inside <clipPath>, <mask>, etc. will never have had
|
||
// ReflowSVG called on them, so call UpdateGlyphPositioning to do this now.
|
||
UpdateGlyphPositioning();
|
||
} else if (IsSubtreeDirty()) {
|
||
// If we are asked to paint before reflow has recomputed mPositions etc.
|
||
// directly via PaintSVG, rather than via a display list, then we need
|
||
// to bail out here too.
|
||
return;
|
||
}
|
||
|
||
const float epsilon = 0.0001;
|
||
if (abs(mLengthAdjustScaleFactor) < epsilon) {
|
||
// A zero scale factor can be caused by having forced the text length to
|
||
// zero. In this situation there is nothing to show.
|
||
return;
|
||
}
|
||
|
||
if (aTransform.IsSingular()) {
|
||
NS_WARNING("Can't render text element!");
|
||
return;
|
||
}
|
||
|
||
gfxMatrix initialMatrix = aContext.CurrentMatrixDouble();
|
||
|
||
gfxMatrix matrixForPaintServers = aTransform * initialMatrix;
|
||
|
||
// SVG frames' PaintSVG methods paint in CSS px, but normally frames paint in
|
||
// dev pixels. Here we multiply a CSS-px-to-dev-pixel factor onto aTransform
|
||
// so our non-SVG nsTextFrame children paint correctly.
|
||
auto auPerDevPx = presContext->AppUnitsPerDevPixel();
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(auPerDevPx);
|
||
gfxMatrix canvasTMForChildren = aTransform;
|
||
canvasTMForChildren.PreScale(cssPxPerDevPx, cssPxPerDevPx);
|
||
initialMatrix.PreScale(1 / cssPxPerDevPx, 1 / cssPxPerDevPx);
|
||
|
||
gfxContextMatrixAutoSaveRestore matSR(&aContext);
|
||
aContext.NewPath();
|
||
aContext.Multiply(canvasTMForChildren);
|
||
gfxMatrix currentMatrix = aContext.CurrentMatrixDouble();
|
||
|
||
RefPtr<nsCaret> caret = presContext->PresShell()->GetCaret();
|
||
nsIFrame* caretFrame = caret->GetPaintGeometry();
|
||
|
||
gfxContextAutoSaveRestore ctxSR;
|
||
TextRenderedRunIterator it(this, TextRenderedRunIterator::eVisibleFrames);
|
||
TextRenderedRun run = it.Current();
|
||
|
||
SVGContextPaint* outerContextPaint =
|
||
SVGContextPaint::GetContextPaint(GetContent());
|
||
|
||
while (run.mFrame) {
|
||
nsTextFrame* frame = run.mFrame;
|
||
|
||
auto contextPaint = MakeRefPtr<SVGContextPaintImpl>();
|
||
DrawMode drawMode = contextPaint->Init(&aDrawTarget, initialMatrix, frame,
|
||
outerContextPaint, aImgParams);
|
||
if (drawMode & DrawMode::GLYPH_STROKE) {
|
||
ctxSR.EnsureSaved(&aContext);
|
||
// This may change the gfxContext's transform (for non-scaling stroke),
|
||
// in which case this needs to happen before we call SetMatrix() below.
|
||
SVGUtils::SetupStrokeGeometry(frame->GetParent(), &aContext,
|
||
outerContextPaint);
|
||
}
|
||
|
||
nscoord startEdge, endEdge;
|
||
run.GetClipEdges(startEdge, endEdge);
|
||
|
||
// Set up the transform for painting the text frame for the substring
|
||
// indicated by the run.
|
||
gfxMatrix runTransform = run.GetTransformFromUserSpaceForPainting(
|
||
presContext, startEdge, endEdge) *
|
||
currentMatrix;
|
||
aContext.SetMatrixDouble(runTransform);
|
||
|
||
if (drawMode != DrawMode(0)) {
|
||
bool paintSVGGlyphs;
|
||
nsTextFrame::PaintTextParams params(&aContext);
|
||
params.framePt = Point();
|
||
params.dirtyRect =
|
||
LayoutDevicePixel::FromAppUnits(frame->InkOverflowRect(), auPerDevPx);
|
||
params.contextPaint = contextPaint;
|
||
bool isSelected;
|
||
if (HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD)) {
|
||
params.state = nsTextFrame::PaintTextParams::GenerateTextMask;
|
||
isSelected = false;
|
||
} else {
|
||
isSelected = frame->IsSelected();
|
||
}
|
||
gfxGroupForBlendAutoSaveRestore autoGroupForBlend(&aContext);
|
||
float opacity = 1.0f;
|
||
nsIFrame* ancestor = frame->GetParent();
|
||
while (ancestor != this) {
|
||
opacity *= ancestor->StyleEffects()->mOpacity;
|
||
ancestor = ancestor->GetParent();
|
||
}
|
||
if (opacity < 1.0f) {
|
||
autoGroupForBlend.PushGroupForBlendBack(gfxContentType::COLOR_ALPHA,
|
||
opacity);
|
||
}
|
||
|
||
if (ShouldRenderAsPath(frame, paintSVGGlyphs)) {
|
||
SVGTextDrawPathCallbacks callbacks(this, aContext, frame,
|
||
matrixForPaintServers, aImgParams,
|
||
paintSVGGlyphs);
|
||
params.callbacks = &callbacks;
|
||
frame->PaintText(params, startEdge, endEdge, nsPoint(), isSelected);
|
||
} else {
|
||
frame->PaintText(params, startEdge, endEdge, nsPoint(), isSelected);
|
||
}
|
||
}
|
||
|
||
if (frame == caretFrame && ShouldPaintCaret(run, caret)) {
|
||
// XXX Should we be looking at the fill/stroke colours to paint the
|
||
// caret with, rather than using the color property?
|
||
caret->PaintCaret(aDrawTarget, frame, nsPoint());
|
||
aContext.NewPath();
|
||
}
|
||
|
||
run = it.Next();
|
||
}
|
||
}
|
||
|
||
nsIFrame* SVGTextFrame::GetFrameForPoint(const gfxPoint& aPoint) {
|
||
NS_ASSERTION(PrincipalChildList().FirstChild(), "must have a child frame");
|
||
|
||
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
// Text frames inside <clipPath> will never have had ReflowSVG called on
|
||
// them, so call UpdateGlyphPositioning to do this now. (Text frames
|
||
// inside <mask> and other non-display containers will never need to
|
||
// be hit tested.)
|
||
UpdateGlyphPositioning();
|
||
} else {
|
||
NS_ASSERTION(!IsSubtreeDirty(), "reflow should have happened");
|
||
}
|
||
|
||
// Hit-testing any clip-path will typically be a lot quicker than the
|
||
// hit-testing of our text frames in the loop below, so we do the former up
|
||
// front to avoid unnecessarily wasting cycles on the latter.
|
||
if (!SVGUtils::HitTestClip(this, aPoint)) {
|
||
return nullptr;
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
// Ideally we'd iterate backwards so that we can just return the first frame
|
||
// that is under aPoint. In practice this will rarely matter though since it
|
||
// is rare for text in/under an SVG <text> element to overlap (i.e. the first
|
||
// text frame that is hit will likely be the only text frame that is hit).
|
||
|
||
TextRenderedRunIterator it(this);
|
||
nsIFrame* hit = nullptr;
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
uint16_t hitTestFlags = SVGUtils::GetGeometryHitTestFlags(run.mFrame);
|
||
if (!hitTestFlags) {
|
||
continue;
|
||
}
|
||
|
||
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
|
||
if (!m.Invert()) {
|
||
return nullptr;
|
||
}
|
||
|
||
gfxPoint pointInRunUserSpace = m.TransformPoint(aPoint);
|
||
gfxRect frameRect = run.GetRunUserSpaceRect(
|
||
presContext, TextRenderedRun::eIncludeFill |
|
||
TextRenderedRun::eIncludeStroke)
|
||
.ToThebesRect();
|
||
|
||
if (Inside(frameRect, pointInRunUserSpace)) {
|
||
hit = run.mFrame;
|
||
}
|
||
}
|
||
return hit;
|
||
}
|
||
|
||
void SVGTextFrame::ReflowSVG() {
|
||
MOZ_ASSERT(SVGUtils::AnyOuterSVGIsCallingReflowSVG(this),
|
||
"This call is probaby a wasteful mistake");
|
||
|
||
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
|
||
"ReflowSVG mechanism not designed for this");
|
||
|
||
if (!SVGUtils::NeedsReflowSVG(this)) {
|
||
MOZ_ASSERT(!HasAnyStateBits(NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY |
|
||
NS_STATE_SVG_POSITIONING_DIRTY),
|
||
"How did this happen?");
|
||
return;
|
||
}
|
||
|
||
MaybeReflowAnonymousBlockChild();
|
||
UpdateGlyphPositioning();
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
SVGBBox r;
|
||
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames);
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
uint32_t runFlags = 0;
|
||
if (!run.mFrame->StyleSVG()->mFill.kind.IsNone()) {
|
||
runFlags |= TextRenderedRun::eIncludeFill;
|
||
}
|
||
if (SVGUtils::HasStroke(run.mFrame)) {
|
||
runFlags |= TextRenderedRun::eIncludeStroke;
|
||
}
|
||
// Our "visual" overflow rect needs to be valid for building display lists
|
||
// for hit testing, which means that for certain values of 'pointer-events'
|
||
// it needs to include the geometry of the fill or stroke even when the
|
||
// fill/ stroke don't actually render (e.g. when stroke="none" or
|
||
// stroke-opacity="0"). GetGeometryHitTestFlags accounts for
|
||
// 'pointer-events'. The text-shadow is not part of the hit-test area.
|
||
uint16_t hitTestFlags = SVGUtils::GetGeometryHitTestFlags(run.mFrame);
|
||
if (hitTestFlags & SVG_HIT_TEST_FILL) {
|
||
runFlags |= TextRenderedRun::eIncludeFill;
|
||
}
|
||
if (hitTestFlags & SVG_HIT_TEST_STROKE) {
|
||
runFlags |= TextRenderedRun::eIncludeStroke;
|
||
}
|
||
|
||
if (runFlags) {
|
||
r.UnionEdges(run.GetUserSpaceRect(presContext, runFlags));
|
||
}
|
||
}
|
||
|
||
if (r.IsEmpty()) {
|
||
mRect.SetEmpty();
|
||
} else {
|
||
mRect = nsLayoutUtils::RoundGfxRectToAppRect(r.ToThebesRect(),
|
||
AppUnitsPerCSSPixel());
|
||
|
||
// Due to rounding issues when we have a transform applied, we sometimes
|
||
// don't include an additional row of pixels. For now, just inflate our
|
||
// covered region.
|
||
if (mLastContextScale != 0.0f) {
|
||
mRect.Inflate(
|
||
ceil(presContext->AppUnitsPerDevPixel() / mLastContextScale));
|
||
}
|
||
}
|
||
|
||
if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
|
||
// Make sure we have our filter property (if any) before calling
|
||
// FinishAndStoreOverflow (subsequent filter changes are handled off
|
||
// nsChangeHint_UpdateEffects):
|
||
SVGObserverUtils::UpdateEffects(this);
|
||
}
|
||
|
||
// Now unset the various reflow bits. Do this before calling
|
||
// FinishAndStoreOverflow since FinishAndStoreOverflow can require glyph
|
||
// positions (to resolve transform-origin).
|
||
RemoveStateBits(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
|
||
NS_FRAME_HAS_DIRTY_CHILDREN);
|
||
|
||
nsRect overflow = nsRect(nsPoint(0, 0), mRect.Size());
|
||
OverflowAreas overflowAreas(overflow, overflow);
|
||
FinishAndStoreOverflow(overflowAreas, mRect.Size());
|
||
}
|
||
|
||
/**
|
||
* Converts SVGUtils::eBBox* flags into TextRenderedRun flags appropriate
|
||
* for the specified rendered run.
|
||
*/
|
||
static uint32_t TextRenderedRunFlagsForBBoxContribution(
|
||
const TextRenderedRun& aRun, uint32_t aBBoxFlags) {
|
||
uint32_t flags = 0;
|
||
if ((aBBoxFlags & SVGUtils::eBBoxIncludeFillGeometry) ||
|
||
((aBBoxFlags & SVGUtils::eBBoxIncludeFill) &&
|
||
!aRun.mFrame->StyleSVG()->mFill.kind.IsNone())) {
|
||
flags |= TextRenderedRun::eIncludeFill;
|
||
}
|
||
if ((aBBoxFlags & SVGUtils::eBBoxIncludeStrokeGeometry) ||
|
||
((aBBoxFlags & SVGUtils::eBBoxIncludeStroke) &&
|
||
SVGUtils::HasStroke(aRun.mFrame))) {
|
||
flags |= TextRenderedRun::eIncludeStroke;
|
||
}
|
||
return flags;
|
||
}
|
||
|
||
SVGBBox SVGTextFrame::GetBBoxContribution(const Matrix& aToBBoxUserspace,
|
||
uint32_t aFlags) {
|
||
NS_ASSERTION(PrincipalChildList().FirstChild(), "must have a child frame");
|
||
SVGBBox bbox;
|
||
|
||
if (aFlags & SVGUtils::eForGetClientRects) {
|
||
Rect rect = NSRectToRect(mRect, AppUnitsPerCSSPixel());
|
||
if (!rect.IsEmpty()) {
|
||
bbox = aToBBoxUserspace.TransformBounds(rect);
|
||
}
|
||
return bbox;
|
||
}
|
||
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid && kid->IsSubtreeDirty()) {
|
||
// Return an empty bbox if our kid's subtree is dirty. This may be called
|
||
// in that situation, e.g. when we're building a display list after an
|
||
// interrupted reflow. This can also be called during reflow before we've
|
||
// been reflowed, e.g. if an earlier sibling is calling
|
||
// FinishAndStoreOverflow and needs our parent's perspective matrix, which
|
||
// depends on the SVG bbox contribution of this frame. In the latter
|
||
// situation, when all siblings have been reflowed, the parent will compute
|
||
// its perspective and rerun FinishAndStoreOverflow for all its children.
|
||
return bbox;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
TextRenderedRunIterator it(this);
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
uint32_t flags = TextRenderedRunFlagsForBBoxContribution(run, aFlags);
|
||
gfxMatrix m = ThebesMatrix(aToBBoxUserspace);
|
||
SVGBBox bboxForRun = run.GetUserSpaceRect(presContext, flags, &m);
|
||
bbox.UnionEdges(bboxForRun);
|
||
}
|
||
|
||
return bbox;
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// SVGTextFrame SVG DOM methods
|
||
|
||
/**
|
||
* Returns whether the specified node has any non-empty Text
|
||
* beneath it.
|
||
*/
|
||
static bool HasTextContent(nsIContent* aContent) {
|
||
NS_ASSERTION(aContent, "expected non-null aContent");
|
||
|
||
TextNodeIterator it(aContent);
|
||
for (Text* text = it.Current(); text; text = it.Next()) {
|
||
if (text->TextLength() != 0) {
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Returns the number of DOM characters beneath the specified node.
|
||
*/
|
||
static uint32_t GetTextContentLength(nsIContent* aContent) {
|
||
NS_ASSERTION(aContent, "expected non-null aContent");
|
||
|
||
uint32_t length = 0;
|
||
TextNodeIterator it(aContent);
|
||
for (Text* text = it.Current(); text; text = it.Next()) {
|
||
length += text->TextLength();
|
||
}
|
||
return length;
|
||
}
|
||
|
||
int32_t SVGTextFrame::ConvertTextElementCharIndexToAddressableIndex(
|
||
int32_t aIndex, nsIContent* aContent) {
|
||
CharIterator it(this, CharIterator::eOriginal, aContent);
|
||
if (!it.AdvanceToSubtree()) {
|
||
return -1;
|
||
}
|
||
int32_t result = 0;
|
||
int32_t textElementCharIndex;
|
||
while (!it.AtEnd() && it.IsWithinSubtree()) {
|
||
bool addressable = !it.IsOriginalCharUnaddressable();
|
||
textElementCharIndex = it.TextElementCharIndex();
|
||
it.Next();
|
||
uint32_t delta = it.TextElementCharIndex() - textElementCharIndex;
|
||
aIndex -= delta;
|
||
if (addressable) {
|
||
if (aIndex < 0) {
|
||
return result;
|
||
}
|
||
result += delta;
|
||
}
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetNumberOfChars method for the specified
|
||
* text content element.
|
||
*/
|
||
uint32_t SVGTextFrame::GetNumberOfChars(nsIContent* aContent) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
return 0;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
uint32_t n = 0;
|
||
CharIterator it(this, CharIterator::eAddressable, aContent);
|
||
if (it.AdvanceToSubtree()) {
|
||
while (!it.AtEnd() && it.IsWithinSubtree()) {
|
||
n++;
|
||
it.Next();
|
||
}
|
||
}
|
||
return n;
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetComputedTextLength method for the specified
|
||
* text child element.
|
||
*/
|
||
float SVGTextFrame::GetComputedTextLength(nsIContent* aContent) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
//
|
||
// If we ever decide that we need to return accurate values here,
|
||
// we could do similar work to GetSubStringLength.
|
||
return 0;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(
|
||
PresContext()->AppUnitsPerDevPixel());
|
||
|
||
nscoord length = 0;
|
||
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
||
aContent);
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
length += run.GetAdvanceWidth();
|
||
}
|
||
|
||
return PresContext()->AppUnitsToGfxUnits(length) * cssPxPerDevPx *
|
||
mLengthAdjustScaleFactor / mFontSizeScaleFactor;
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM SelectSubString method for the specified
|
||
* text content element.
|
||
*/
|
||
void SVGTextFrame::SelectSubString(nsIContent* aContent, uint32_t charnum,
|
||
uint32_t nchars, ErrorResult& aRv) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
// XXXbz Should this just return without throwing like the no-frame case?
|
||
aRv.ThrowInvalidStateError("No layout information available for SVG text");
|
||
return;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
// Convert charnum/nchars from addressable characters relative to
|
||
// aContent to global character indices.
|
||
CharIterator chit(this, CharIterator::eAddressable, aContent);
|
||
if (!chit.AdvanceToSubtree() || !chit.Next(charnum) ||
|
||
chit.IsAfterSubtree()) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return;
|
||
}
|
||
charnum = chit.TextElementCharIndex();
|
||
const RefPtr<nsIContent> content = chit.TextFrame()->GetContent();
|
||
chit.NextWithinSubtree(nchars);
|
||
nchars = chit.TextElementCharIndex() - charnum;
|
||
|
||
RefPtr<nsFrameSelection> frameSelection = GetFrameSelection();
|
||
|
||
frameSelection->HandleClick(content, charnum, charnum + nchars,
|
||
nsFrameSelection::FocusMode::kCollapseToNewPoint,
|
||
CaretAssociationHint::Before);
|
||
}
|
||
|
||
/**
|
||
* For some content we cannot (or currently cannot) compute the length
|
||
* without reflowing. In those cases we need to fall back to using
|
||
* GetSubStringLengthSlowFallback.
|
||
*
|
||
* We fall back for textPath since we need glyph positioning in order to
|
||
* tell if any characters should be ignored due to having fallen off the
|
||
* end of the textPath.
|
||
*
|
||
* We fall back for bidi because GetTrimmedOffsets does not produce the
|
||
* correct results for bidi continuations when passed aPostReflow = false.
|
||
* XXX It may be possible to determine which continuations to trim from (and
|
||
* which sides), but currently we don't do that. It would require us to
|
||
* identify the visual (rather than logical) start and end of the line, to
|
||
* avoid trimming at line-internal frame boundaries. Maybe nsBidiPresUtils
|
||
* methods like GetFrameToRightOf and GetFrameToLeftOf would help?
|
||
*
|
||
*/
|
||
bool SVGTextFrame::RequiresSlowFallbackForSubStringLength() {
|
||
TextFrameIterator frameIter(this);
|
||
for (nsTextFrame* frame = frameIter.Current(); frame;
|
||
frame = frameIter.Next()) {
|
||
if (frameIter.TextPathFrame() || frame->GetNextContinuation()) {
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetSubStringLength method for the specified
|
||
* text content element.
|
||
*/
|
||
float SVGTextFrame::GetSubStringLengthFastPath(nsIContent* aContent,
|
||
uint32_t charnum,
|
||
uint32_t nchars,
|
||
ErrorResult& aRv) {
|
||
MOZ_ASSERT(!RequiresSlowFallbackForSubStringLength());
|
||
|
||
// We only need our text correspondence to be up to date (no need to call
|
||
// UpdateGlyphPositioning).
|
||
TextNodeCorrespondenceRecorder::RecordCorrespondence(this);
|
||
|
||
// Convert charnum/nchars from addressable characters relative to
|
||
// aContent to global character indices.
|
||
CharIterator chit(this, CharIterator::eAddressable, aContent,
|
||
/* aPostReflow */ false);
|
||
if (!chit.AdvanceToSubtree() || !chit.Next(charnum) ||
|
||
chit.IsAfterSubtree()) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return 0;
|
||
}
|
||
|
||
// We do this after the ThrowIndexSizeError() bit so JS calls correctly throw
|
||
// when necessary.
|
||
if (nchars == 0) {
|
||
return 0.0f;
|
||
}
|
||
|
||
charnum = chit.TextElementCharIndex();
|
||
chit.NextWithinSubtree(nchars);
|
||
nchars = chit.TextElementCharIndex() - charnum;
|
||
|
||
// Sum of the substring advances.
|
||
nscoord textLength = 0;
|
||
|
||
TextFrameIterator frit(this); // aSubtree = nullptr
|
||
|
||
// Index of the first non-skipped char in the frame, and of a subsequent char
|
||
// that we're interested in. Both are relative to the index of the first
|
||
// non-skipped char in the ancestor <text> element.
|
||
uint32_t frameStartTextElementCharIndex = 0;
|
||
uint32_t textElementCharIndex;
|
||
|
||
for (nsTextFrame* frame = frit.Current(); frame; frame = frit.Next()) {
|
||
frameStartTextElementCharIndex += frit.UndisplayedCharacters();
|
||
textElementCharIndex = frameStartTextElementCharIndex;
|
||
|
||
// Offset into frame's Text:
|
||
const uint32_t untrimmedOffset = frame->GetContentOffset();
|
||
const uint32_t untrimmedLength = frame->GetContentEnd() - untrimmedOffset;
|
||
|
||
// Trim the offset/length to remove any leading/trailing white space.
|
||
uint32_t trimmedOffset = untrimmedOffset;
|
||
uint32_t trimmedLength = untrimmedLength;
|
||
nsTextFrame::TrimmedOffsets trimmedOffsets = frame->GetTrimmedOffsets(
|
||
frame->TextFragment(), nsTextFrame::TrimmedOffsetFlags::NotPostReflow);
|
||
TrimOffsets(trimmedOffset, trimmedLength, trimmedOffsets);
|
||
|
||
textElementCharIndex += trimmedOffset - untrimmedOffset;
|
||
|
||
if (textElementCharIndex >= charnum + nchars) {
|
||
break; // we're past the end of the substring
|
||
}
|
||
|
||
uint32_t offset = textElementCharIndex;
|
||
|
||
// Intersect the substring we are interested in with the range covered by
|
||
// the nsTextFrame.
|
||
IntersectInterval(offset, trimmedLength, charnum, nchars);
|
||
|
||
if (trimmedLength != 0) {
|
||
// Convert offset into an index into the frame.
|
||
offset += trimmedOffset - textElementCharIndex;
|
||
|
||
gfxSkipCharsIterator it = frame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxTextRun* textRun = frame->GetTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(frame, it);
|
||
|
||
Range range = ConvertOriginalToSkipped(it, offset, trimmedLength);
|
||
|
||
// Accumulate the advance.
|
||
textLength += textRun->GetAdvanceWidth(range, &provider);
|
||
}
|
||
|
||
// Advance, ready for next call:
|
||
frameStartTextElementCharIndex += untrimmedLength;
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(
|
||
presContext->AppUnitsPerDevPixel());
|
||
|
||
return presContext->AppUnitsToGfxUnits(textLength) * cssPxPerDevPx /
|
||
mFontSizeScaleFactor;
|
||
}
|
||
|
||
float SVGTextFrame::GetSubStringLengthSlowFallback(nsIContent* aContent,
|
||
uint32_t charnum,
|
||
uint32_t nchars,
|
||
ErrorResult& aRv) {
|
||
UpdateGlyphPositioning();
|
||
|
||
// Convert charnum/nchars from addressable characters relative to
|
||
// aContent to global character indices.
|
||
CharIterator chit(this, CharIterator::eAddressable, aContent);
|
||
if (!chit.AdvanceToSubtree() || !chit.Next(charnum) ||
|
||
chit.IsAfterSubtree()) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return 0;
|
||
}
|
||
|
||
if (nchars == 0) {
|
||
return 0.0f;
|
||
}
|
||
|
||
charnum = chit.TextElementCharIndex();
|
||
chit.NextWithinSubtree(nchars);
|
||
nchars = chit.TextElementCharIndex() - charnum;
|
||
|
||
// Find each rendered run that intersects with the range defined
|
||
// by charnum/nchars.
|
||
nscoord textLength = 0;
|
||
TextRenderedRunIterator runIter(this, TextRenderedRunIterator::eAllFrames);
|
||
TextRenderedRun run = runIter.Current();
|
||
while (run.mFrame) {
|
||
// If this rendered run is past the substring we are interested in, we
|
||
// are done.
|
||
uint32_t offset = run.mTextElementCharIndex;
|
||
if (offset >= charnum + nchars) {
|
||
break;
|
||
}
|
||
|
||
// Intersect the substring we are interested in with the range covered by
|
||
// the rendered run.
|
||
uint32_t length = run.mTextFrameContentLength;
|
||
IntersectInterval(offset, length, charnum, nchars);
|
||
|
||
if (length != 0) {
|
||
// Convert offset into an index into the frame.
|
||
offset += run.mTextFrameContentOffset - run.mTextElementCharIndex;
|
||
|
||
gfxSkipCharsIterator it =
|
||
run.mFrame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxTextRun* textRun = run.mFrame->GetTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(run.mFrame, it);
|
||
|
||
Range range = ConvertOriginalToSkipped(it, offset, length);
|
||
|
||
// Accumulate the advance.
|
||
textLength += textRun->GetAdvanceWidth(range, &provider);
|
||
}
|
||
|
||
run = runIter.Next();
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(
|
||
presContext->AppUnitsPerDevPixel());
|
||
|
||
return presContext->AppUnitsToGfxUnits(textLength) * cssPxPerDevPx /
|
||
mFontSizeScaleFactor;
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetCharNumAtPosition method for the specified
|
||
* text content element.
|
||
*/
|
||
int32_t SVGTextFrame::GetCharNumAtPosition(nsIContent* aContent,
|
||
const DOMPointInit& aPoint) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
return -1;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
nsPresContext* context = PresContext();
|
||
|
||
gfxPoint p(aPoint.mX, aPoint.mY);
|
||
|
||
int32_t result = -1;
|
||
|
||
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
||
aContent);
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
// Hit test this rendered run. Later runs will override earlier ones.
|
||
int32_t index = run.GetCharNumAtPosition(context, p);
|
||
if (index != -1) {
|
||
result = index + run.mTextElementCharIndex;
|
||
}
|
||
}
|
||
|
||
if (result == -1) {
|
||
return result;
|
||
}
|
||
|
||
return ConvertTextElementCharIndexToAddressableIndex(result, aContent);
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetStartPositionOfChar method for the specified
|
||
* text content element.
|
||
*/
|
||
already_AddRefed<DOMSVGPoint> SVGTextFrame::GetStartPositionOfChar(
|
||
nsIContent* aContent, uint32_t aCharNum, ErrorResult& aRv) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
aRv.ThrowInvalidStateError("No layout information available for SVG text");
|
||
return nullptr;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
CharIterator it(this, CharIterator::eAddressable, aContent);
|
||
if (!it.AdvanceToSubtree() || !it.Next(aCharNum)) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return nullptr;
|
||
}
|
||
|
||
// We need to return the start position of the whole glyph.
|
||
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
||
|
||
return do_AddRef(new DOMSVGPoint(ToPoint(mPositions[startIndex].mPosition)));
|
||
}
|
||
|
||
/**
|
||
* Returns the advance of the entire glyph whose starting character is at
|
||
* aTextElementCharIndex.
|
||
*
|
||
* aIterator, if provided, must be a CharIterator that already points to
|
||
* aTextElementCharIndex that is restricted to aContent and is using
|
||
* filter mode eAddressable.
|
||
*/
|
||
static gfxFloat GetGlyphAdvance(SVGTextFrame* aFrame, nsIContent* aContent,
|
||
uint32_t aTextElementCharIndex,
|
||
CharIterator* aIterator) {
|
||
MOZ_ASSERT(!aIterator || (aIterator->Filter() == CharIterator::eAddressable &&
|
||
aIterator->GetSubtree() == aContent &&
|
||
aIterator->GlyphStartTextElementCharIndex() ==
|
||
aTextElementCharIndex),
|
||
"Invalid aIterator");
|
||
|
||
Maybe<CharIterator> newIterator;
|
||
CharIterator* it = aIterator;
|
||
if (!it) {
|
||
newIterator.emplace(aFrame, CharIterator::eAddressable, aContent);
|
||
if (!newIterator->AdvanceToSubtree()) {
|
||
MOZ_ASSERT_UNREACHABLE("Invalid aContent");
|
||
return 0.0;
|
||
}
|
||
it = newIterator.ptr();
|
||
}
|
||
|
||
while (it->GlyphStartTextElementCharIndex() != aTextElementCharIndex) {
|
||
if (!it->Next()) {
|
||
MOZ_ASSERT_UNREACHABLE("Invalid aTextElementCharIndex");
|
||
return 0.0;
|
||
}
|
||
}
|
||
|
||
if (it->AtEnd()) {
|
||
MOZ_ASSERT_UNREACHABLE("Invalid aTextElementCharIndex");
|
||
return 0.0;
|
||
}
|
||
|
||
nsPresContext* presContext = aFrame->PresContext();
|
||
gfxFloat advance = 0.0;
|
||
|
||
for (;;) {
|
||
advance += it->GetAdvance(presContext);
|
||
if (!it->Next() ||
|
||
it->GlyphStartTextElementCharIndex() != aTextElementCharIndex) {
|
||
break;
|
||
}
|
||
}
|
||
|
||
return advance;
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetEndPositionOfChar method for the specified
|
||
* text content element.
|
||
*/
|
||
already_AddRefed<DOMSVGPoint> SVGTextFrame::GetEndPositionOfChar(
|
||
nsIContent* aContent, uint32_t aCharNum, ErrorResult& aRv) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
aRv.ThrowInvalidStateError("No layout information available for SVG text");
|
||
return nullptr;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
CharIterator it(this, CharIterator::eAddressable, aContent);
|
||
if (!it.AdvanceToSubtree() || !it.Next(aCharNum)) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return nullptr;
|
||
}
|
||
|
||
// We need to return the end position of the whole glyph.
|
||
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
||
|
||
// Get the advance of the glyph.
|
||
gfxFloat advance =
|
||
GetGlyphAdvance(this, aContent, startIndex,
|
||
it.IsClusterAndLigatureGroupStart() ? &it : nullptr);
|
||
if (it.TextRun()->IsRightToLeft()) {
|
||
advance = -advance;
|
||
}
|
||
|
||
// The end position is the start position plus the advance in the direction
|
||
// of the glyph's rotation.
|
||
Matrix m = Matrix::Rotation(mPositions[startIndex].mAngle) *
|
||
Matrix::Translation(ToPoint(mPositions[startIndex].mPosition));
|
||
Point p = m.TransformPoint(Point(advance / mFontSizeScaleFactor, 0));
|
||
|
||
return do_AddRef(new DOMSVGPoint(p));
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetExtentOfChar method for the specified
|
||
* text content element.
|
||
*/
|
||
already_AddRefed<SVGRect> SVGTextFrame::GetExtentOfChar(nsIContent* aContent,
|
||
uint32_t aCharNum,
|
||
ErrorResult& aRv) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
aRv.ThrowInvalidStateError("No layout information available for SVG text");
|
||
return nullptr;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
// Search for the character whose addressable index is aCharNum.
|
||
CharIterator it(this, CharIterator::eAddressable, aContent);
|
||
if (!it.AdvanceToSubtree() || !it.Next(aCharNum)) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return nullptr;
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(
|
||
presContext->AppUnitsPerDevPixel());
|
||
|
||
nsTextFrame* textFrame = it.TextFrame();
|
||
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
||
bool isRTL = it.TextRun()->IsRightToLeft();
|
||
bool isVertical = it.TextRun()->IsVertical();
|
||
|
||
// Get the glyph advance.
|
||
gfxFloat advance =
|
||
GetGlyphAdvance(this, aContent, startIndex,
|
||
it.IsClusterAndLigatureGroupStart() ? &it : nullptr);
|
||
gfxFloat x = isRTL ? -advance : 0.0;
|
||
|
||
// The ascent and descent gives the height of the glyph.
|
||
gfxFloat ascent, descent;
|
||
GetAscentAndDescentInAppUnits(textFrame, ascent, descent);
|
||
|
||
// The horizontal extent is the origin of the glyph plus the advance
|
||
// in the direction of the glyph's rotation.
|
||
gfxMatrix m;
|
||
m.PreTranslate(mPositions[startIndex].mPosition);
|
||
m.PreRotate(mPositions[startIndex].mAngle);
|
||
m.PreScale(1 / mFontSizeScaleFactor, 1 / mFontSizeScaleFactor);
|
||
|
||
gfxRect glyphRect;
|
||
if (isVertical) {
|
||
glyphRect = gfxRect(
|
||
-presContext->AppUnitsToGfxUnits(descent) * cssPxPerDevPx, x,
|
||
presContext->AppUnitsToGfxUnits(ascent + descent) * cssPxPerDevPx,
|
||
advance);
|
||
} else {
|
||
glyphRect = gfxRect(
|
||
x, -presContext->AppUnitsToGfxUnits(ascent) * cssPxPerDevPx, advance,
|
||
presContext->AppUnitsToGfxUnits(ascent + descent) * cssPxPerDevPx);
|
||
}
|
||
|
||
// Transform the glyph's rect into user space.
|
||
gfxRect r = m.TransformBounds(glyphRect);
|
||
|
||
return do_AddRef(new SVGRect(aContent, ToRect(r)));
|
||
}
|
||
|
||
/**
|
||
* Implements the SVG DOM GetRotationOfChar method for the specified
|
||
* text content element.
|
||
*/
|
||
float SVGTextFrame::GetRotationOfChar(nsIContent* aContent, uint32_t aCharNum,
|
||
ErrorResult& aRv) {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid->IsSubtreeDirty()) {
|
||
// We're never reflowed if we're under a non-SVG element that is
|
||
// never reflowed (such as the HTML 'caption' element).
|
||
aRv.ThrowInvalidStateError("No layout information available for SVG text");
|
||
return 0;
|
||
}
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
CharIterator it(this, CharIterator::eAddressable, aContent);
|
||
if (!it.AdvanceToSubtree() || !it.Next(aCharNum)) {
|
||
aRv.ThrowIndexSizeError("Character index out of range");
|
||
return 0;
|
||
}
|
||
|
||
// we need to account for the glyph's underlying orientation
|
||
const gfxTextRun::GlyphRun& glyphRun = it.GlyphRun();
|
||
int32_t glyphOrientation =
|
||
90 * (glyphRun.IsSidewaysRight() - glyphRun.IsSidewaysLeft());
|
||
|
||
return mPositions[it.TextElementCharIndex()].mAngle * 180.0 / M_PI +
|
||
glyphOrientation;
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// SVGTextFrame text layout methods
|
||
|
||
/**
|
||
* Given the character position array before values have been filled in
|
||
* to any unspecified positions, and an array of dx/dy values, returns whether
|
||
* a character at a given index should start a new rendered run.
|
||
*
|
||
* @param aPositions The array of character positions before unspecified
|
||
* positions have been filled in and dx/dy values have been added to them.
|
||
* @param aDeltas The array of dx/dy values.
|
||
* @param aIndex The character index in question.
|
||
*/
|
||
static bool ShouldStartRunAtIndex(const nsTArray<CharPosition>& aPositions,
|
||
const nsTArray<gfxPoint>& aDeltas,
|
||
uint32_t aIndex) {
|
||
if (aIndex == 0) {
|
||
return true;
|
||
}
|
||
|
||
if (aIndex < aPositions.Length()) {
|
||
// If an explicit x or y value was given, start a new run.
|
||
if (aPositions[aIndex].IsXSpecified() ||
|
||
aPositions[aIndex].IsYSpecified()) {
|
||
return true;
|
||
}
|
||
|
||
// If a non-zero rotation was given, or the previous character had a non-
|
||
// zero rotation, start a new run.
|
||
if ((aPositions[aIndex].IsAngleSpecified() &&
|
||
aPositions[aIndex].mAngle != 0.0f) ||
|
||
(aPositions[aIndex - 1].IsAngleSpecified() &&
|
||
(aPositions[aIndex - 1].mAngle != 0.0f))) {
|
||
return true;
|
||
}
|
||
}
|
||
|
||
if (aIndex < aDeltas.Length()) {
|
||
// If a non-zero dx or dy value was given, start a new run.
|
||
if (aDeltas[aIndex].x != 0.0 || aDeltas[aIndex].y != 0.0) {
|
||
return true;
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool SVGTextFrame::ResolvePositionsForNode(nsIContent* aContent,
|
||
uint32_t& aIndex, bool aInTextPath,
|
||
bool& aForceStartOfChunk,
|
||
nsTArray<gfxPoint>& aDeltas) {
|
||
if (aContent->IsText()) {
|
||
// We found a text node.
|
||
uint32_t length = aContent->AsText()->TextLength();
|
||
if (length) {
|
||
uint32_t end = aIndex + length;
|
||
if (MOZ_UNLIKELY(end > mPositions.Length())) {
|
||
MOZ_ASSERT_UNREACHABLE(
|
||
"length of mPositions does not match characters "
|
||
"found by iterating content");
|
||
return false;
|
||
}
|
||
if (aForceStartOfChunk) {
|
||
// Note this character as starting a new anchored chunk.
|
||
mPositions[aIndex].mStartOfChunk = true;
|
||
aForceStartOfChunk = false;
|
||
}
|
||
while (aIndex < end) {
|
||
// Record whether each of these characters should start a new rendered
|
||
// run. That is always the case for characters on a text path.
|
||
//
|
||
// Run boundaries due to rotate="" values are handled in
|
||
// DoGlyphPositioning.
|
||
if (aInTextPath || ShouldStartRunAtIndex(mPositions, aDeltas, aIndex)) {
|
||
mPositions[aIndex].mRunBoundary = true;
|
||
}
|
||
aIndex++;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
// Skip past elements that aren't text content elements.
|
||
if (!IsTextContentElement(aContent)) {
|
||
return true;
|
||
}
|
||
|
||
if (aContent->IsSVGElement(nsGkAtoms::textPath)) {
|
||
// Any ‘y’ attributes on horizontal <textPath> elements are ignored.
|
||
// Similarly, for vertical <texPath>s x attributes are ignored.
|
||
// <textPath> elements behave as if they have x="0" y="0" on them, but only
|
||
// if there is not a value for the non-ignored coordinate that got inherited
|
||
// from a parent. We skip this if there is no text content, so that empty
|
||
// <textPath>s don't interrupt the layout of text in the parent element.
|
||
if (HasTextContent(aContent)) {
|
||
if (MOZ_UNLIKELY(aIndex >= mPositions.Length())) {
|
||
MOZ_ASSERT_UNREACHABLE(
|
||
"length of mPositions does not match characters "
|
||
"found by iterating content");
|
||
return false;
|
||
}
|
||
bool vertical = GetWritingMode().IsVertical();
|
||
if (vertical || !mPositions[aIndex].IsXSpecified()) {
|
||
mPositions[aIndex].mPosition.x = 0.0;
|
||
}
|
||
if (!vertical || !mPositions[aIndex].IsYSpecified()) {
|
||
mPositions[aIndex].mPosition.y = 0.0;
|
||
}
|
||
mPositions[aIndex].mStartOfChunk = true;
|
||
}
|
||
} else if (!aContent->IsSVGElement(nsGkAtoms::a)) {
|
||
MOZ_ASSERT(aContent->IsSVGElement());
|
||
|
||
// We have a text content element that can have x/y/dx/dy/rotate attributes.
|
||
SVGElement* element = static_cast<SVGElement*>(aContent);
|
||
|
||
// Get x, y, dx, dy.
|
||
SVGUserUnitList x, y, dx, dy;
|
||
element->GetAnimatedLengthListValues(&x, &y, &dx, &dy, nullptr);
|
||
|
||
// Get rotate.
|
||
const SVGNumberList* rotate = nullptr;
|
||
SVGAnimatedNumberList* animatedRotate =
|
||
element->GetAnimatedNumberList(nsGkAtoms::rotate);
|
||
if (animatedRotate) {
|
||
rotate = &animatedRotate->GetAnimValue();
|
||
}
|
||
|
||
bool percentages = false;
|
||
uint32_t count = GetTextContentLength(aContent);
|
||
|
||
if (MOZ_UNLIKELY(aIndex + count > mPositions.Length())) {
|
||
MOZ_ASSERT_UNREACHABLE(
|
||
"length of mPositions does not match characters "
|
||
"found by iterating content");
|
||
return false;
|
||
}
|
||
|
||
// New text anchoring chunks start at each character assigned a position
|
||
// with x="" or y="", or if we forced one with aForceStartOfChunk due to
|
||
// being just after a <textPath>.
|
||
uint32_t newChunkCount = std::max(x.Length(), y.Length());
|
||
if (!newChunkCount && aForceStartOfChunk) {
|
||
newChunkCount = 1;
|
||
}
|
||
for (uint32_t i = 0, j = 0; i < newChunkCount && j < count; j++) {
|
||
if (!mPositions[aIndex + j].mUnaddressable) {
|
||
mPositions[aIndex + j].mStartOfChunk = true;
|
||
i++;
|
||
}
|
||
}
|
||
|
||
// Copy dx="" and dy="" values into aDeltas.
|
||
if (!dx.IsEmpty() || !dy.IsEmpty()) {
|
||
// Any unspecified deltas when we grow the array just get left as 0s.
|
||
aDeltas.EnsureLengthAtLeast(aIndex + count);
|
||
for (uint32_t i = 0, j = 0; i < dx.Length() && j < count; j++) {
|
||
if (!mPositions[aIndex + j].mUnaddressable) {
|
||
aDeltas[aIndex + j].x = dx[i];
|
||
percentages = percentages || dx.HasPercentageValueAt(i);
|
||
i++;
|
||
}
|
||
}
|
||
for (uint32_t i = 0, j = 0; i < dy.Length() && j < count; j++) {
|
||
if (!mPositions[aIndex + j].mUnaddressable) {
|
||
aDeltas[aIndex + j].y = dy[i];
|
||
percentages = percentages || dy.HasPercentageValueAt(i);
|
||
i++;
|
||
}
|
||
}
|
||
}
|
||
|
||
// Copy x="" and y="" values.
|
||
for (uint32_t i = 0, j = 0; i < x.Length() && j < count; j++) {
|
||
if (!mPositions[aIndex + j].mUnaddressable) {
|
||
mPositions[aIndex + j].mPosition.x = x[i];
|
||
percentages = percentages || x.HasPercentageValueAt(i);
|
||
i++;
|
||
}
|
||
}
|
||
for (uint32_t i = 0, j = 0; i < y.Length() && j < count; j++) {
|
||
if (!mPositions[aIndex + j].mUnaddressable) {
|
||
mPositions[aIndex + j].mPosition.y = y[i];
|
||
percentages = percentages || y.HasPercentageValueAt(i);
|
||
i++;
|
||
}
|
||
}
|
||
|
||
// Copy rotate="" values.
|
||
if (rotate && !rotate->IsEmpty()) {
|
||
uint32_t i = 0, j = 0;
|
||
while (i < rotate->Length() && j < count) {
|
||
if (!mPositions[aIndex + j].mUnaddressable) {
|
||
mPositions[aIndex + j].mAngle = M_PI * (*rotate)[i] / 180.0;
|
||
i++;
|
||
}
|
||
j++;
|
||
}
|
||
// Propagate final rotate="" value to the end of this element.
|
||
while (j < count) {
|
||
mPositions[aIndex + j].mAngle = mPositions[aIndex + j - 1].mAngle;
|
||
j++;
|
||
}
|
||
}
|
||
|
||
if (percentages) {
|
||
AddStateBits(NS_STATE_SVG_POSITIONING_MAY_USE_PERCENTAGES);
|
||
}
|
||
}
|
||
|
||
// Recurse to children.
|
||
bool inTextPath = aInTextPath || aContent->IsSVGElement(nsGkAtoms::textPath);
|
||
for (nsIContent* child = aContent->GetFirstChild(); child;
|
||
child = child->GetNextSibling()) {
|
||
bool ok = ResolvePositionsForNode(child, aIndex, inTextPath,
|
||
aForceStartOfChunk, aDeltas);
|
||
if (!ok) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
if (aContent->IsSVGElement(nsGkAtoms::textPath)) {
|
||
// Force a new anchored chunk just after a <textPath>.
|
||
aForceStartOfChunk = true;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
bool SVGTextFrame::ResolvePositions(nsTArray<gfxPoint>& aDeltas,
|
||
bool aRunPerGlyph) {
|
||
NS_ASSERTION(mPositions.IsEmpty(), "expected mPositions to be empty");
|
||
RemoveStateBits(NS_STATE_SVG_POSITIONING_MAY_USE_PERCENTAGES);
|
||
|
||
CharIterator it(this, CharIterator::eOriginal, /* aSubtree */ nullptr);
|
||
if (it.AtEnd()) {
|
||
return false;
|
||
}
|
||
|
||
// We assume the first character position is (0,0) unless we later see
|
||
// otherwise, and note it as unaddressable if it is.
|
||
bool firstCharUnaddressable = it.IsOriginalCharUnaddressable();
|
||
mPositions.AppendElement(CharPosition::Unspecified(firstCharUnaddressable));
|
||
|
||
// Fill in unspecified positions for all remaining characters, noting
|
||
// them as unaddressable if they are.
|
||
uint32_t index = 0;
|
||
while (it.Next()) {
|
||
while (++index < it.TextElementCharIndex()) {
|
||
mPositions.AppendElement(CharPosition::Unspecified(false));
|
||
}
|
||
mPositions.AppendElement(
|
||
CharPosition::Unspecified(it.IsOriginalCharUnaddressable()));
|
||
}
|
||
while (++index < it.TextElementCharIndex()) {
|
||
mPositions.AppendElement(CharPosition::Unspecified(false));
|
||
}
|
||
|
||
// Recurse over the content and fill in character positions as we go.
|
||
bool forceStartOfChunk = false;
|
||
index = 0;
|
||
bool ok = ResolvePositionsForNode(mContent, index, aRunPerGlyph,
|
||
forceStartOfChunk, aDeltas);
|
||
return ok && index > 0;
|
||
}
|
||
|
||
void SVGTextFrame::DetermineCharPositions(nsTArray<nsPoint>& aPositions) {
|
||
NS_ASSERTION(aPositions.IsEmpty(), "expected aPositions to be empty");
|
||
|
||
nsPoint position;
|
||
|
||
TextFrameIterator frit(this);
|
||
for (nsTextFrame* frame = frit.Current(); frame; frame = frit.Next()) {
|
||
gfxSkipCharsIterator it = frame->EnsureTextRun(nsTextFrame::eInflated);
|
||
gfxTextRun* textRun = frame->GetTextRun(nsTextFrame::eInflated);
|
||
nsTextFrame::PropertyProvider provider(frame, it);
|
||
|
||
// Reset the position to the new frame's position.
|
||
position = frit.Position();
|
||
if (textRun->IsVertical()) {
|
||
if (textRun->IsRightToLeft()) {
|
||
position.y += frame->GetRect().height;
|
||
}
|
||
position.x += GetBaselinePosition(frame, textRun, frit.DominantBaseline(),
|
||
mFontSizeScaleFactor);
|
||
} else {
|
||
if (textRun->IsRightToLeft()) {
|
||
position.x += frame->GetRect().width;
|
||
}
|
||
position.y += GetBaselinePosition(frame, textRun, frit.DominantBaseline(),
|
||
mFontSizeScaleFactor);
|
||
}
|
||
|
||
// Any characters not in a frame, e.g. when display:none.
|
||
for (uint32_t i = 0; i < frit.UndisplayedCharacters(); i++) {
|
||
aPositions.AppendElement(position);
|
||
}
|
||
|
||
// Any white space characters trimmed at the start of the line of text.
|
||
nsTextFrame::TrimmedOffsets trimmedOffsets =
|
||
frame->GetTrimmedOffsets(frame->TextFragment());
|
||
while (it.GetOriginalOffset() < trimmedOffsets.mStart) {
|
||
aPositions.AppendElement(position);
|
||
it.AdvanceOriginal(1);
|
||
}
|
||
|
||
// Visible characters in the text frame.
|
||
while (it.GetOriginalOffset() < frame->GetContentEnd()) {
|
||
aPositions.AppendElement(position);
|
||
if (!it.IsOriginalCharSkipped()) {
|
||
// Accumulate partial ligature advance into position. (We must get
|
||
// partial advances rather than get the advance of the whole ligature
|
||
// group / cluster at once, since the group may span text frames, and
|
||
// the PropertyProvider only has spacing information for the current
|
||
// text frame.)
|
||
uint32_t offset = it.GetSkippedOffset();
|
||
nscoord advance =
|
||
textRun->GetAdvanceWidth(Range(offset, offset + 1), &provider);
|
||
(textRun->IsVertical() ? position.y : position.x) +=
|
||
textRun->IsRightToLeft() ? -advance : advance;
|
||
}
|
||
it.AdvanceOriginal(1);
|
||
}
|
||
}
|
||
|
||
// Finally any characters at the end that are not in a frame.
|
||
for (uint32_t i = 0; i < frit.UndisplayedCharacters(); i++) {
|
||
aPositions.AppendElement(position);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Physical text-anchor values.
|
||
*/
|
||
enum TextAnchorSide { eAnchorLeft, eAnchorMiddle, eAnchorRight };
|
||
|
||
/**
|
||
* Converts a logical text-anchor value to its physical value, based on whether
|
||
* it is for an RTL frame.
|
||
*/
|
||
static TextAnchorSide ConvertLogicalTextAnchorToPhysical(
|
||
StyleTextAnchor aTextAnchor, bool aIsRightToLeft) {
|
||
NS_ASSERTION(uint8_t(aTextAnchor) <= 3, "unexpected value for aTextAnchor");
|
||
if (!aIsRightToLeft) {
|
||
return TextAnchorSide(uint8_t(aTextAnchor));
|
||
}
|
||
return TextAnchorSide(2 - uint8_t(aTextAnchor));
|
||
}
|
||
|
||
/**
|
||
* Shifts the recorded character positions for an anchored chunk.
|
||
*
|
||
* @param aCharPositions The recorded character positions.
|
||
* @param aChunkStart The character index the starts the anchored chunk. This
|
||
* character's initial position is the anchor point.
|
||
* @param aChunkEnd The character index just after the end of the anchored
|
||
* chunk.
|
||
* @param aVisIStartEdge The left/top-most edge of any of the glyphs within the
|
||
* anchored chunk.
|
||
* @param aVisIEndEdge The right/bottom-most edge of any of the glyphs within
|
||
* the anchored chunk.
|
||
* @param aAnchorSide The direction to anchor.
|
||
*/
|
||
static void ShiftAnchoredChunk(nsTArray<CharPosition>& aCharPositions,
|
||
uint32_t aChunkStart, uint32_t aChunkEnd,
|
||
gfxFloat aVisIStartEdge, gfxFloat aVisIEndEdge,
|
||
TextAnchorSide aAnchorSide, bool aVertical) {
|
||
NS_ASSERTION(aVisIStartEdge <= aVisIEndEdge,
|
||
"unexpected anchored chunk edges");
|
||
NS_ASSERTION(aChunkStart < aChunkEnd,
|
||
"unexpected values for aChunkStart and aChunkEnd");
|
||
|
||
gfxFloat shift = aVertical ? aCharPositions[aChunkStart].mPosition.y
|
||
: aCharPositions[aChunkStart].mPosition.x;
|
||
switch (aAnchorSide) {
|
||
case eAnchorLeft:
|
||
shift -= aVisIStartEdge;
|
||
break;
|
||
case eAnchorMiddle:
|
||
shift -= (aVisIStartEdge + aVisIEndEdge) / 2;
|
||
break;
|
||
case eAnchorRight:
|
||
shift -= aVisIEndEdge;
|
||
break;
|
||
default:
|
||
MOZ_ASSERT_UNREACHABLE("unexpected value for aAnchorSide");
|
||
}
|
||
|
||
if (shift != 0.0) {
|
||
if (aVertical) {
|
||
for (uint32_t i = aChunkStart; i < aChunkEnd; i++) {
|
||
aCharPositions[i].mPosition.y += shift;
|
||
}
|
||
} else {
|
||
for (uint32_t i = aChunkStart; i < aChunkEnd; i++) {
|
||
aCharPositions[i].mPosition.x += shift;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::AdjustChunksForLineBreaks() {
|
||
nsBlockFrame* block = do_QueryFrame(PrincipalChildList().FirstChild());
|
||
NS_ASSERTION(block, "expected block frame");
|
||
|
||
nsBlockFrame::LineIterator line = block->LinesBegin();
|
||
|
||
CharIterator it(this, CharIterator::eOriginal, /* aSubtree */ nullptr);
|
||
while (!it.AtEnd() && line != block->LinesEnd()) {
|
||
if (it.TextFrame() == line->mFirstChild) {
|
||
mPositions[it.TextElementCharIndex()].mStartOfChunk = true;
|
||
line++;
|
||
}
|
||
it.AdvancePastCurrentFrame();
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::AdjustPositionsForClusters() {
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
// Find all of the characters that are in the middle of a cluster or
|
||
// ligature group, and adjust their positions and rotations to match
|
||
// the first character of the cluster/group.
|
||
//
|
||
// Also move the boundaries of text rendered runs and anchored chunks to
|
||
// not lie in the middle of cluster/group.
|
||
|
||
// The partial advance of the current cluster or ligature group that we
|
||
// have accumulated.
|
||
gfxFloat partialAdvance = 0.0;
|
||
|
||
CharIterator it(this, CharIterator::eUnskipped, /* aSubtree */ nullptr);
|
||
bool isFirst = true;
|
||
while (!it.AtEnd()) {
|
||
if (it.IsClusterAndLigatureGroupStart() || isFirst) {
|
||
// If we're at the start of a new cluster or ligature group, reset our
|
||
// accumulated partial advance. Also treat the beginning of the text as
|
||
// an anchor, even if it is a combining character and therefore was
|
||
// marked as being a Unicode cluster continuation.
|
||
partialAdvance = 0.0;
|
||
isFirst = false;
|
||
} else {
|
||
// Otherwise, we're in the middle of a cluster or ligature group, and
|
||
// we need to use the currently accumulated partial advance to adjust
|
||
// the character's position and rotation.
|
||
|
||
// Find the start of the cluster/ligature group.
|
||
uint32_t charIndex = it.TextElementCharIndex();
|
||
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
|
||
MOZ_ASSERT(charIndex != startIndex,
|
||
"If the current character is in the middle of a cluster or "
|
||
"ligature group, then charIndex must be different from "
|
||
"startIndex");
|
||
|
||
mPositions[charIndex].mClusterOrLigatureGroupMiddle = true;
|
||
|
||
// Don't allow different rotations on ligature parts.
|
||
bool rotationAdjusted = false;
|
||
double angle = mPositions[startIndex].mAngle;
|
||
if (mPositions[charIndex].mAngle != angle) {
|
||
mPositions[charIndex].mAngle = angle;
|
||
rotationAdjusted = true;
|
||
}
|
||
|
||
// Update the character position.
|
||
gfxFloat advance = partialAdvance / mFontSizeScaleFactor;
|
||
gfxPoint direction = gfxPoint(cos(angle), sin(angle)) *
|
||
(it.TextRun()->IsRightToLeft() ? -1.0 : 1.0);
|
||
if (it.TextRun()->IsVertical()) {
|
||
std::swap(direction.x, direction.y);
|
||
}
|
||
mPositions[charIndex].mPosition =
|
||
mPositions[startIndex].mPosition + direction * advance;
|
||
|
||
// Ensure any runs that would end in the middle of a ligature now end just
|
||
// after the ligature.
|
||
if (mPositions[charIndex].mRunBoundary) {
|
||
mPositions[charIndex].mRunBoundary = false;
|
||
if (charIndex + 1 < mPositions.Length()) {
|
||
mPositions[charIndex + 1].mRunBoundary = true;
|
||
}
|
||
} else if (rotationAdjusted) {
|
||
if (charIndex + 1 < mPositions.Length()) {
|
||
mPositions[charIndex + 1].mRunBoundary = true;
|
||
}
|
||
}
|
||
|
||
// Ensure any anchored chunks that would begin in the middle of a ligature
|
||
// now begin just after the ligature.
|
||
if (mPositions[charIndex].mStartOfChunk) {
|
||
mPositions[charIndex].mStartOfChunk = false;
|
||
if (charIndex + 1 < mPositions.Length()) {
|
||
mPositions[charIndex + 1].mStartOfChunk = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
// Accumulate the current character's partial advance.
|
||
partialAdvance += it.GetAdvance(presContext);
|
||
|
||
it.Next();
|
||
}
|
||
}
|
||
|
||
already_AddRefed<Path> SVGTextFrame::GetTextPath(nsIFrame* aTextPathFrame) {
|
||
nsIContent* content = aTextPathFrame->GetContent();
|
||
SVGTextPathElement* tp = static_cast<SVGTextPathElement*>(content);
|
||
if (tp->mPath.IsRendered()) {
|
||
// This is just an attribute so there's no transform that can apply
|
||
// so we can just return the path directly.
|
||
return tp->mPath.GetAnimValue().BuildPathForMeasuring(
|
||
aTextPathFrame->Style()->EffectiveZoom().ToFloat());
|
||
}
|
||
|
||
SVGGeometryElement* geomElement =
|
||
SVGObserverUtils::GetAndObserveTextPathsPath(aTextPathFrame);
|
||
if (!geomElement) {
|
||
return nullptr;
|
||
}
|
||
|
||
RefPtr<Path> path = geomElement->GetOrBuildPathForMeasuring();
|
||
if (!path) {
|
||
return nullptr;
|
||
}
|
||
|
||
// Apply the geometry element's transform if appropriate.
|
||
auto matrix = geomElement->LocalTransform();
|
||
if (!matrix.IsIdentity()) {
|
||
Path::Transform(path, matrix);
|
||
}
|
||
|
||
return path.forget();
|
||
}
|
||
|
||
gfxFloat SVGTextFrame::GetOffsetScale(nsIFrame* aTextPathFrame) {
|
||
nsIContent* content = aTextPathFrame->GetContent();
|
||
SVGTextPathElement* tp = static_cast<SVGTextPathElement*>(content);
|
||
if (tp->mPath.IsRendered()) {
|
||
// A path attribute has no pathLength or transform
|
||
// so we return a unit scale.
|
||
return 1.0;
|
||
}
|
||
|
||
SVGGeometryElement* geomElement =
|
||
SVGObserverUtils::GetAndObserveTextPathsPath(aTextPathFrame);
|
||
if (!geomElement) {
|
||
return 1.0;
|
||
}
|
||
return geomElement->GetPathLengthScale(SVGGeometryElement::eForTextPath);
|
||
}
|
||
|
||
gfxFloat SVGTextFrame::GetStartOffset(nsIFrame* aTextPathFrame) {
|
||
SVGTextPathElement* tp =
|
||
static_cast<SVGTextPathElement*>(aTextPathFrame->GetContent());
|
||
SVGAnimatedLength* length =
|
||
&tp->mLengthAttributes[SVGTextPathElement::STARTOFFSET];
|
||
|
||
if (length->IsPercentage()) {
|
||
if (!std::isfinite(GetOffsetScale(aTextPathFrame))) {
|
||
// Either pathLength="0" for this path or the path has 0 length.
|
||
return 0.0;
|
||
}
|
||
RefPtr<Path> data = GetTextPath(aTextPathFrame);
|
||
return data ? length->GetAnimValInSpecifiedUnits() * data->ComputeLength() /
|
||
100.0
|
||
: 0.0;
|
||
}
|
||
float lengthValue = length->GetAnimValueWithZoom(tp);
|
||
// If offsetScale is infinity we want to return 0 not NaN
|
||
return lengthValue == 0 ? 0.0 : lengthValue * GetOffsetScale(aTextPathFrame);
|
||
}
|
||
|
||
void SVGTextFrame::DoTextPathLayout() {
|
||
nsPresContext* context = PresContext();
|
||
|
||
CharIterator it(this, CharIterator::eOriginal, /* aSubtree */ nullptr);
|
||
while (!it.AtEnd()) {
|
||
nsIFrame* textPathFrame = it.TextPathFrame();
|
||
if (!textPathFrame) {
|
||
// Skip past this frame if we're not in a text path.
|
||
it.AdvancePastCurrentFrame();
|
||
continue;
|
||
}
|
||
|
||
// Get the path itself.
|
||
RefPtr<Path> path = GetTextPath(textPathFrame);
|
||
if (!path) {
|
||
uint32_t start = it.TextElementCharIndex();
|
||
it.AdvancePastCurrentTextPathFrame();
|
||
uint32_t end = it.TextElementCharIndex();
|
||
for (uint32_t i = start; i < end; i++) {
|
||
mPositions[i].mHidden = true;
|
||
}
|
||
continue;
|
||
}
|
||
|
||
SVGTextPathElement* textPath =
|
||
static_cast<SVGTextPathElement*>(textPathFrame->GetContent());
|
||
uint16_t side =
|
||
textPath->EnumAttributes()[SVGTextPathElement::SIDE].GetAnimValue();
|
||
|
||
gfxFloat offset = GetStartOffset(textPathFrame);
|
||
Float pathLength = path->ComputeLength();
|
||
|
||
// If the first character within the text path is in the middle of a
|
||
// cluster or ligature group, just skip it and don't apply text path
|
||
// positioning.
|
||
while (!it.AtEnd()) {
|
||
if (it.IsOriginalCharSkipped()) {
|
||
it.Next();
|
||
continue;
|
||
}
|
||
if (it.IsClusterAndLigatureGroupStart()) {
|
||
break;
|
||
}
|
||
it.Next();
|
||
}
|
||
|
||
bool skippedEndOfTextPath = false;
|
||
|
||
// Loop for each character in the text path.
|
||
while (!it.AtEnd() && it.TextPathFrame() &&
|
||
it.TextPathFrame()->GetContent() == textPath) {
|
||
// The index of the cluster or ligature group's first character.
|
||
uint32_t i = it.TextElementCharIndex();
|
||
|
||
// The index of the next character of the cluster or ligature.
|
||
// We track this as we loop over the characters below so that we
|
||
// can detect undisplayed characters and append entries into
|
||
// partialAdvances for them.
|
||
uint32_t j = i + 1;
|
||
|
||
MOZ_ASSERT(!mPositions[i].mClusterOrLigatureGroupMiddle);
|
||
|
||
gfxFloat sign = it.TextRun()->IsRightToLeft() ? -1.0 : 1.0;
|
||
bool vertical = it.TextRun()->IsVertical();
|
||
|
||
// Compute cumulative advances for each character of the cluster or
|
||
// ligature group.
|
||
AutoTArray<gfxFloat, 4> partialAdvances;
|
||
gfxFloat partialAdvance = it.GetAdvance(context);
|
||
partialAdvances.AppendElement(partialAdvance);
|
||
while (it.Next()) {
|
||
// Append entries for any undisplayed characters the CharIterator
|
||
// skipped over.
|
||
MOZ_ASSERT(j <= it.TextElementCharIndex());
|
||
while (j < it.TextElementCharIndex()) {
|
||
partialAdvances.AppendElement(partialAdvance);
|
||
++j;
|
||
}
|
||
// This loop may end up outside of the current text path, but
|
||
// that's OK; we'll consider any complete cluster or ligature
|
||
// group that begins inside the text path as being affected
|
||
// by it.
|
||
if (it.IsOriginalCharSkipped()) {
|
||
if (!it.TextPathFrame()) {
|
||
skippedEndOfTextPath = true;
|
||
break;
|
||
}
|
||
// Leave partialAdvance unchanged.
|
||
} else if (it.IsClusterAndLigatureGroupStart()) {
|
||
break;
|
||
} else {
|
||
partialAdvance += it.GetAdvance(context);
|
||
}
|
||
partialAdvances.AppendElement(partialAdvance);
|
||
}
|
||
|
||
if (!skippedEndOfTextPath) {
|
||
// Any final undisplayed characters the CharIterator skipped over.
|
||
MOZ_ASSERT(j <= it.TextElementCharIndex());
|
||
while (j < it.TextElementCharIndex()) {
|
||
partialAdvances.AppendElement(partialAdvance);
|
||
++j;
|
||
}
|
||
}
|
||
|
||
gfxFloat halfAdvance =
|
||
partialAdvances.LastElement() / mFontSizeScaleFactor / 2.0;
|
||
gfxFloat midx =
|
||
(vertical ? mPositions[i].mPosition.y : mPositions[i].mPosition.x) +
|
||
sign * halfAdvance + offset;
|
||
|
||
// Hide the character if it falls off the end of the path.
|
||
mPositions[i].mHidden = midx < 0 || midx > pathLength;
|
||
|
||
// Position the character on the path at the right angle.
|
||
Point tangent; // Unit vector tangent to the point we find.
|
||
Point pt;
|
||
if (side == TEXTPATH_SIDETYPE_RIGHT) {
|
||
pt = path->ComputePointAtLength(Float(pathLength - midx), &tangent);
|
||
tangent = -tangent;
|
||
} else {
|
||
pt = path->ComputePointAtLength(Float(midx), &tangent);
|
||
}
|
||
Float rotation = vertical ? atan2f(-tangent.x, tangent.y)
|
||
: atan2f(tangent.y, tangent.x);
|
||
Point normal(-tangent.y, tangent.x); // Unit vector normal to the point.
|
||
Point offsetFromPath = normal * (vertical ? -mPositions[i].mPosition.x
|
||
: mPositions[i].mPosition.y);
|
||
pt += offsetFromPath;
|
||
Point direction = tangent * sign;
|
||
mPositions[i].mPosition =
|
||
ThebesPoint(pt) - ThebesPoint(direction) * halfAdvance;
|
||
mPositions[i].mAngle += rotation;
|
||
|
||
// Position any characters for a partial ligature.
|
||
for (uint32_t k = i + 1; k < j; k++) {
|
||
gfxPoint partialAdvance = ThebesPoint(direction) *
|
||
partialAdvances[k - i] / mFontSizeScaleFactor;
|
||
mPositions[k].mPosition = mPositions[i].mPosition + partialAdvance;
|
||
mPositions[k].mAngle = mPositions[i].mAngle;
|
||
mPositions[k].mHidden = mPositions[i].mHidden;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::DoAnchoring() {
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
CharIterator it(this, CharIterator::eOriginal, /* aSubtree */ nullptr);
|
||
|
||
// Don't need to worry about skipped or trimmed characters.
|
||
while (!it.AtEnd() &&
|
||
(it.IsOriginalCharSkipped() || it.IsOriginalCharTrimmed())) {
|
||
it.Next();
|
||
}
|
||
|
||
bool vertical = GetWritingMode().IsVertical();
|
||
for (uint32_t start = it.TextElementCharIndex(); start < mPositions.Length();
|
||
start = it.TextElementCharIndex()) {
|
||
it.AdvanceToCharacter(start);
|
||
nsTextFrame* chunkFrame = it.TextFrame();
|
||
|
||
// Measure characters in this chunk to find the left-most and right-most
|
||
// edges of all glyphs within the chunk.
|
||
uint32_t index = it.TextElementCharIndex();
|
||
uint32_t end = start;
|
||
gfxFloat left = std::numeric_limits<gfxFloat>::infinity();
|
||
gfxFloat right = -std::numeric_limits<gfxFloat>::infinity();
|
||
do {
|
||
if (!it.IsOriginalCharSkipped() && !it.IsOriginalCharTrimmed()) {
|
||
gfxFloat advance = it.GetAdvance(presContext) / mFontSizeScaleFactor;
|
||
gfxFloat pos = it.TextRun()->IsVertical()
|
||
? mPositions[index].mPosition.y
|
||
: mPositions[index].mPosition.x;
|
||
if (it.TextRun()->IsRightToLeft()) {
|
||
left = std::min(left, pos - advance);
|
||
right = std::max(right, pos);
|
||
} else {
|
||
left = std::min(left, pos);
|
||
right = std::max(right, pos + advance);
|
||
}
|
||
}
|
||
it.Next();
|
||
index = end = it.TextElementCharIndex();
|
||
} while (!it.AtEnd() && !mPositions[end].mStartOfChunk);
|
||
|
||
if (left != std::numeric_limits<gfxFloat>::infinity()) {
|
||
bool isRTL =
|
||
chunkFrame->StyleVisibility()->mDirection == StyleDirection::Rtl;
|
||
TextAnchorSide anchor = ConvertLogicalTextAnchorToPhysical(
|
||
chunkFrame->StyleSVG()->mTextAnchor, isRTL);
|
||
|
||
ShiftAnchoredChunk(mPositions, start, end, left, right, anchor, vertical);
|
||
}
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::DoGlyphPositioning() {
|
||
mPositions.Clear();
|
||
RemoveStateBits(NS_STATE_SVG_POSITIONING_DIRTY);
|
||
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (kid && kid->IsSubtreeDirty()) {
|
||
MOZ_ASSERT(false, "should have already reflowed the kid");
|
||
return;
|
||
}
|
||
|
||
// Since we can be called directly via GetBBoxContribution, our correspondence
|
||
// may not be up to date.
|
||
TextNodeCorrespondenceRecorder::RecordCorrespondence(this);
|
||
|
||
// Determine the positions of each character in app units.
|
||
AutoTArray<nsPoint, 64> charPositions;
|
||
DetermineCharPositions(charPositions);
|
||
|
||
if (charPositions.IsEmpty()) {
|
||
// No characters, so nothing to do.
|
||
return;
|
||
}
|
||
|
||
// If the textLength="" attribute was specified, then we need ResolvePositions
|
||
// to record that a new run starts with each glyph.
|
||
SVGTextContentElement* element =
|
||
static_cast<SVGTextContentElement*>(GetContent());
|
||
SVGAnimatedLength* textLengthAttr =
|
||
element->GetAnimatedLength(nsGkAtoms::textLength);
|
||
uint16_t lengthAdjust =
|
||
element->EnumAttributes()[SVGTextContentElement::LENGTHADJUST]
|
||
.GetAnimValue();
|
||
bool adjustingTextLength = textLengthAttr->IsExplicitlySet();
|
||
float expectedTextLength = textLengthAttr->GetAnimValueWithZoom(element);
|
||
|
||
if (adjustingTextLength &&
|
||
(expectedTextLength < 0.0f || lengthAdjust == LENGTHADJUST_UNKNOWN)) {
|
||
// If textLength="" is less than zero or lengthAdjust is unknown, ignore it.
|
||
adjustingTextLength = false;
|
||
}
|
||
|
||
// Get the x, y, dx, dy, rotate values for the subtree.
|
||
AutoTArray<gfxPoint, 16> deltas;
|
||
if (!ResolvePositions(deltas, adjustingTextLength)) {
|
||
// If ResolvePositions returned false, it means either there were some
|
||
// characters in the DOM but none of them are displayed, or there was
|
||
// an error in processing mPositions. Clear out mPositions so that we don't
|
||
// attempt to do any painting later.
|
||
mPositions.Clear();
|
||
return;
|
||
}
|
||
|
||
// XXX We might be able to do less work when there is at most a single
|
||
// x/y/dx/dy position.
|
||
|
||
// Truncate the positioning arrays to the actual number of characters present.
|
||
TruncateTo(deltas, charPositions);
|
||
TruncateTo(mPositions, charPositions);
|
||
|
||
// Fill in an unspecified position for the first addressable character.
|
||
uint32_t first = 0;
|
||
while (first + 1 < mPositions.Length() && mPositions[first].mUnaddressable) {
|
||
++first;
|
||
}
|
||
if (!mPositions[first].IsXSpecified()) {
|
||
mPositions[first].mPosition.x = 0.0;
|
||
}
|
||
if (!mPositions[first].IsYSpecified()) {
|
||
mPositions[first].mPosition.y = 0.0;
|
||
}
|
||
if (!mPositions[first].IsAngleSpecified()) {
|
||
mPositions[first].mAngle = 0.0;
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
bool vertical = GetWritingMode().IsVertical();
|
||
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(
|
||
presContext->AppUnitsPerDevPixel());
|
||
double factor = cssPxPerDevPx / mFontSizeScaleFactor;
|
||
|
||
// Determine how much to compress or expand glyph positions due to
|
||
// textLength="" and lengthAdjust="".
|
||
double adjustment = 0.0;
|
||
mLengthAdjustScaleFactor = 1.0f;
|
||
if (adjustingTextLength) {
|
||
nscoord frameLength =
|
||
vertical ? PrincipalChildList().FirstChild()->GetRect().height
|
||
: PrincipalChildList().FirstChild()->GetRect().width;
|
||
float actualTextLength = static_cast<float>(
|
||
presContext->AppUnitsToGfxUnits(frameLength) * factor);
|
||
|
||
switch (lengthAdjust) {
|
||
case LENGTHADJUST_SPACINGANDGLYPHS:
|
||
// Scale the glyphs and their positions.
|
||
if (actualTextLength > 0) {
|
||
mLengthAdjustScaleFactor = expectedTextLength / actualTextLength;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
MOZ_ASSERT(lengthAdjust == LENGTHADJUST_SPACING);
|
||
// Just add space between each glyph.
|
||
int32_t adjustableSpaces = 0;
|
||
for (uint32_t i = 1; i < mPositions.Length(); i++) {
|
||
if (!mPositions[i].mUnaddressable) {
|
||
adjustableSpaces++;
|
||
}
|
||
}
|
||
if (adjustableSpaces) {
|
||
adjustment =
|
||
(expectedTextLength - actualTextLength) / adjustableSpaces;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
// Fill in any unspecified character positions based on the positions recorded
|
||
// in charPositions, and also add in the dx/dy values.
|
||
if (!deltas.IsEmpty()) {
|
||
mPositions[0].mPosition += deltas[0];
|
||
}
|
||
|
||
gfxFloat xLengthAdjustFactor = vertical ? 1.0 : mLengthAdjustScaleFactor;
|
||
gfxFloat yLengthAdjustFactor = vertical ? mLengthAdjustScaleFactor : 1.0;
|
||
for (uint32_t i = 1; i < mPositions.Length(); i++) {
|
||
// Fill in unspecified x position.
|
||
if (!mPositions[i].IsXSpecified()) {
|
||
nscoord d = charPositions[i].x - charPositions[i - 1].x;
|
||
mPositions[i].mPosition.x =
|
||
mPositions[i - 1].mPosition.x +
|
||
presContext->AppUnitsToGfxUnits(d) * factor * xLengthAdjustFactor;
|
||
if (!vertical && !mPositions[i].mUnaddressable) {
|
||
mPositions[i].mPosition.x += adjustment;
|
||
}
|
||
}
|
||
// Fill in unspecified y position.
|
||
if (!mPositions[i].IsYSpecified()) {
|
||
nscoord d = charPositions[i].y - charPositions[i - 1].y;
|
||
mPositions[i].mPosition.y =
|
||
mPositions[i - 1].mPosition.y +
|
||
presContext->AppUnitsToGfxUnits(d) * factor * yLengthAdjustFactor;
|
||
if (vertical && !mPositions[i].mUnaddressable) {
|
||
mPositions[i].mPosition.y += adjustment;
|
||
}
|
||
}
|
||
// Add in dx/dy.
|
||
if (i < deltas.Length()) {
|
||
mPositions[i].mPosition += deltas[i];
|
||
}
|
||
// Fill in unspecified rotation values.
|
||
if (!mPositions[i].IsAngleSpecified()) {
|
||
mPositions[i].mAngle = 0.0f;
|
||
}
|
||
}
|
||
|
||
MOZ_ASSERT(mPositions.Length() == charPositions.Length());
|
||
|
||
AdjustChunksForLineBreaks();
|
||
AdjustPositionsForClusters();
|
||
DoAnchoring();
|
||
DoTextPathLayout();
|
||
}
|
||
|
||
bool SVGTextFrame::ShouldRenderAsPath(nsTextFrame* aFrame,
|
||
bool& aShouldPaintSVGGlyphs) {
|
||
// Rendering to a clip path.
|
||
if (HasAnyStateBits(NS_STATE_SVG_CLIPPATH_CHILD)) {
|
||
aShouldPaintSVGGlyphs = false;
|
||
return true;
|
||
}
|
||
|
||
aShouldPaintSVGGlyphs = true;
|
||
|
||
const nsStyleSVG* style = aFrame->StyleSVG();
|
||
|
||
// Fill is a non-solid paint or is not opaque.
|
||
if (!(style->mFill.kind.IsNone() ||
|
||
(style->mFill.kind.IsColor() &&
|
||
SVGUtils::GetOpacity(style->mFillOpacity, /*aContextPaint*/ nullptr) ==
|
||
1.0f))) {
|
||
return true;
|
||
}
|
||
|
||
// If we're going to need to draw a non-opaque shadow.
|
||
// It's possible nsTextFrame will support non-opaque shadows in the future,
|
||
// in which case this test can be removed.
|
||
if (style->mFill.kind.IsColor() && aFrame->StyleText()->HasTextShadow() &&
|
||
NS_GET_A(style->mFill.kind.AsColor().CalcColor(*aFrame->Style())) !=
|
||
0xFF) {
|
||
return true;
|
||
}
|
||
|
||
// Text has a stroke.
|
||
if (style->HasStroke()) {
|
||
if (style->mStrokeWidth.IsContextValue()) {
|
||
return true;
|
||
}
|
||
if (SVGContentUtils::CoordToFloat(
|
||
static_cast<SVGElement*>(GetContent()),
|
||
style->mStrokeWidth.AsLengthPercentage()) > 0) {
|
||
return true;
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
void SVGTextFrame::ScheduleReflowSVG() {
|
||
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
ScheduleReflowSVGNonDisplayText(
|
||
IntrinsicDirty::FrameAncestorsAndDescendants);
|
||
} else {
|
||
SVGUtils::ScheduleReflowSVG(this);
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::NotifyGlyphMetricsChange(bool aUpdateTextCorrespondence) {
|
||
if (aUpdateTextCorrespondence) {
|
||
AddStateBits(NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY);
|
||
}
|
||
AddStateBits(NS_STATE_SVG_POSITIONING_DIRTY);
|
||
nsLayoutUtils::PostRestyleEvent(mContent->AsElement(), RestyleHint{0},
|
||
nsChangeHint_InvalidateRenderingObservers);
|
||
ScheduleReflowSVG();
|
||
}
|
||
|
||
void SVGTextFrame::UpdateGlyphPositioning() {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (!kid) {
|
||
return;
|
||
}
|
||
|
||
if (HasAnyStateBits(NS_STATE_SVG_POSITIONING_DIRTY)) {
|
||
DoGlyphPositioning();
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::MaybeResolveBidiForAnonymousBlockChild() {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
|
||
if (kid && kid->HasAnyStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION) &&
|
||
PresContext()->BidiEnabled()) {
|
||
MOZ_ASSERT(static_cast<nsBlockFrame*>(do_QueryFrame(kid)),
|
||
"Expect anonymous child to be an nsBlockFrame");
|
||
nsBidiPresUtils::Resolve(static_cast<nsBlockFrame*>(kid));
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::MaybeReflowAnonymousBlockChild() {
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (!kid) {
|
||
return;
|
||
}
|
||
|
||
NS_ASSERTION(!kid->HasAnyStateBits(NS_FRAME_IN_REFLOW),
|
||
"should not be in reflow when about to reflow again");
|
||
|
||
if (IsSubtreeDirty()) {
|
||
if (HasAnyStateBits(NS_FRAME_IS_DIRTY)) {
|
||
// If we require a full reflow, ensure our kid is marked fully dirty.
|
||
// (Note that our anonymous nsBlockFrame is not an ISVGDisplayableFrame,
|
||
// so even when we are called via our ReflowSVG this will not be done for
|
||
// us by SVGDisplayContainerFrame::ReflowSVG.)
|
||
kid->MarkSubtreeDirty();
|
||
}
|
||
|
||
// The RecordCorrespondence and DoReflow calls can result in new text frames
|
||
// being created (due to bidi resolution or reflow). We set this bit to
|
||
// guard against unnecessarily calling back in to
|
||
// ScheduleReflowSVGNonDisplayText from nsIFrame::DidSetComputedStyle on
|
||
// those new text frames.
|
||
AddStateBits(NS_STATE_SVG_TEXT_IN_REFLOW);
|
||
|
||
TextNodeCorrespondenceRecorder::RecordCorrespondence(this);
|
||
|
||
MOZ_ASSERT(SVGUtils::AnyOuterSVGIsCallingReflowSVG(this),
|
||
"should be under ReflowSVG");
|
||
nsPresContext::InterruptPreventer noInterrupts(PresContext());
|
||
DoReflow();
|
||
|
||
RemoveStateBits(NS_STATE_SVG_TEXT_IN_REFLOW);
|
||
}
|
||
}
|
||
|
||
void SVGTextFrame::DoReflow() {
|
||
MOZ_ASSERT(HasAnyStateBits(NS_STATE_SVG_TEXT_IN_REFLOW));
|
||
|
||
// Since we are going to reflow the anonymous block frame, we will
|
||
// need to update mPositions.
|
||
// We also mark our text correspondence as dirty since we can end up needing
|
||
// reflow in ways that do not set NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY.
|
||
// (We'd then fail the "expected a TextNodeCorrespondenceProperty" assertion
|
||
// when UpdateGlyphPositioning() is called after we return.)
|
||
AddStateBits(NS_STATE_SVG_TEXT_CORRESPONDENCE_DIRTY |
|
||
NS_STATE_SVG_POSITIONING_DIRTY);
|
||
|
||
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
|
||
// Normally, these dirty flags would be cleared in ReflowSVG(), but that
|
||
// doesn't get called for non-display frames. We don't want to reflow our
|
||
// descendants every time SVGTextFrame::PaintSVG makes sure that we have
|
||
// valid positions by calling UpdateGlyphPositioning(), so we need to clear
|
||
// these dirty bits. Note that this also breaks an invalidation loop where
|
||
// our descendants invalidate as they reflow, which invalidates rendering
|
||
// observers, which reschedules the frame that is currently painting by
|
||
// referencing us to paint again. See bug 839958 comment 7. Hopefully we
|
||
// will break that loop more convincingly at some point.
|
||
RemoveStateBits(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN);
|
||
}
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
nsIFrame* kid = PrincipalChildList().FirstChild();
|
||
if (!kid) {
|
||
return;
|
||
}
|
||
|
||
UniquePtr<gfxContext> renderingContext =
|
||
presContext->PresShell()->CreateReferenceRenderingContext();
|
||
|
||
if (UpdateFontSizeScaleFactor()) {
|
||
// If the font size scale factor changed, we need the block to report
|
||
// an updated preferred width.
|
||
kid->MarkIntrinsicISizesDirty();
|
||
}
|
||
|
||
const IntrinsicSizeInput input(renderingContext.get(), Nothing(), Nothing());
|
||
nscoord inlineSize = kid->GetPrefISize(input);
|
||
WritingMode wm = kid->GetWritingMode();
|
||
ReflowInput reflowInput(presContext, kid, renderingContext.get(),
|
||
LogicalSize(wm, inlineSize, NS_UNCONSTRAINEDSIZE));
|
||
ReflowOutput desiredSize(reflowInput);
|
||
nsReflowStatus status;
|
||
|
||
NS_ASSERTION(
|
||
reflowInput.ComputedPhysicalBorderPadding() == nsMargin(0, 0, 0, 0) &&
|
||
reflowInput.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
|
||
"style system should ensure that :-moz-svg-text "
|
||
"does not get styled");
|
||
|
||
kid->Reflow(presContext, desiredSize, reflowInput, status);
|
||
kid->DidReflow(presContext, &reflowInput);
|
||
kid->SetSize(wm, desiredSize.Size(wm));
|
||
}
|
||
|
||
// Usable font size range in devpixels / user-units
|
||
#define CLAMP_MIN_SIZE 8.0
|
||
#define CLAMP_MAX_SIZE 200.0
|
||
#define PRECISE_SIZE 200.0
|
||
|
||
bool SVGTextFrame::UpdateFontSizeScaleFactor() {
|
||
float contextScale = GetContextScale(this);
|
||
mLastContextScale = contextScale;
|
||
|
||
double oldFontSizeScaleFactor = mFontSizeScaleFactor;
|
||
|
||
bool geometricPrecision = false;
|
||
// We may need to invert a matrix with these values later.
|
||
CSSCoord min = std::sqrt(std::numeric_limits<float>::max());
|
||
CSSCoord max = std::sqrt(std::numeric_limits<float>::min());
|
||
bool anyText = false;
|
||
|
||
// Find the minimum and maximum font sizes used over all the
|
||
// nsTextFrames.
|
||
TextFrameIterator it(this);
|
||
nsTextFrame* f = it.Current();
|
||
while (f) {
|
||
if (!geometricPrecision) {
|
||
// Unfortunately we can't treat text-rendering:geometricPrecision
|
||
// separately for each text frame.
|
||
geometricPrecision = f->StyleText()->mTextRendering ==
|
||
StyleTextRendering::Geometricprecision;
|
||
}
|
||
const auto& fontSize = f->StyleFont()->mFont.size;
|
||
if (!fontSize.IsZero()) {
|
||
min = std::min(min, fontSize.ToCSSPixels());
|
||
max = std::max(max, fontSize.ToCSSPixels());
|
||
anyText = true;
|
||
}
|
||
f = it.Next();
|
||
}
|
||
|
||
if (!anyText) {
|
||
// No text, so no need for scaling.
|
||
mFontSizeScaleFactor = 1.0;
|
||
return mFontSizeScaleFactor != oldFontSizeScaleFactor;
|
||
}
|
||
|
||
if (geometricPrecision) {
|
||
// We want to ensure minSize is scaled to PRECISE_SIZE.
|
||
mFontSizeScaleFactor = PRECISE_SIZE / min;
|
||
return mFontSizeScaleFactor != oldFontSizeScaleFactor;
|
||
}
|
||
|
||
double minTextRunSize = min * contextScale;
|
||
double maxTextRunSize = max * contextScale;
|
||
|
||
if (minTextRunSize >= CLAMP_MIN_SIZE && maxTextRunSize <= CLAMP_MAX_SIZE) {
|
||
// We are already in the ideal font size range for all text frames,
|
||
// so we only have to take into account the contextScale.
|
||
mFontSizeScaleFactor = contextScale;
|
||
} else if (max / min > CLAMP_MAX_SIZE / CLAMP_MIN_SIZE) {
|
||
// We can't scale the font sizes so that all of the text frames lie
|
||
// within our ideal font size range.
|
||
// Heuristically, if the maxTextRunSize is within the CLAMP_MAX_SIZE
|
||
// as a reasonable value, it's likely to be the user's intent to
|
||
// get a valid font for the maxTextRunSize one, we should honor it.
|
||
// The same for minTextRunSize.
|
||
if (maxTextRunSize <= CLAMP_MAX_SIZE) {
|
||
mFontSizeScaleFactor = CLAMP_MAX_SIZE / max;
|
||
} else if (minTextRunSize >= CLAMP_MIN_SIZE) {
|
||
mFontSizeScaleFactor = CLAMP_MIN_SIZE / min;
|
||
} else {
|
||
// So maxTextRunSize is too big, minTextRunSize is too small,
|
||
// we can't really do anything for this case, just leave it as is.
|
||
mFontSizeScaleFactor = contextScale;
|
||
}
|
||
} else if (minTextRunSize < CLAMP_MIN_SIZE) {
|
||
mFontSizeScaleFactor = CLAMP_MIN_SIZE / min;
|
||
} else {
|
||
mFontSizeScaleFactor = CLAMP_MAX_SIZE / max;
|
||
}
|
||
|
||
return mFontSizeScaleFactor != oldFontSizeScaleFactor;
|
||
}
|
||
|
||
double SVGTextFrame::GetFontSizeScaleFactor() const {
|
||
return mFontSizeScaleFactor;
|
||
}
|
||
|
||
/**
|
||
* Take aPoint, which is in the <text> element's user space, and convert
|
||
* it to the appropriate frame user space of aChildFrame according to
|
||
* which rendered run the point hits.
|
||
*/
|
||
Point SVGTextFrame::TransformFramePointToTextChild(
|
||
const Point& aPoint, const nsIFrame* aChildFrame) {
|
||
NS_ASSERTION(aChildFrame && nsLayoutUtils::GetClosestFrameOfType(
|
||
aChildFrame->GetParent(),
|
||
LayoutFrameType::SVGText) == this,
|
||
"aChildFrame must be a descendant of this frame");
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
// Add in the mRect offset to aPoint, as that will have been taken into
|
||
// account when transforming the point from the ancestor frame down
|
||
// to this one.
|
||
float cssPxPerDevPx = nsPresContext::AppUnitsToFloatCSSPixels(
|
||
presContext->AppUnitsPerDevPixel());
|
||
float factor = AppUnitsPerCSSPixel();
|
||
Point framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
|
||
NSAppUnitsToFloatPixels(mRect.y, factor));
|
||
Point pointInUserSpace = aPoint * cssPxPerDevPx + framePosition;
|
||
|
||
// Find the closest rendered run for the text frames beneath aChildFrame.
|
||
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
||
aChildFrame);
|
||
TextRenderedRun hit;
|
||
gfxPoint pointInRun;
|
||
nscoord dx = nscoord_MAX;
|
||
nscoord dy = nscoord_MAX;
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
uint32_t flags = TextRenderedRun::eIncludeFill |
|
||
TextRenderedRun::eIncludeStroke |
|
||
TextRenderedRun::eNoHorizontalOverflow;
|
||
gfxRect runRect =
|
||
run.GetRunUserSpaceRect(presContext, flags).ToThebesRect();
|
||
|
||
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
|
||
if (!m.Invert()) {
|
||
return aPoint;
|
||
}
|
||
gfxPoint pointInRunUserSpace =
|
||
m.TransformPoint(ThebesPoint(pointInUserSpace));
|
||
|
||
if (Inside(runRect, pointInRunUserSpace)) {
|
||
// The point was inside the rendered run's rect, so we choose it.
|
||
dx = 0;
|
||
dy = 0;
|
||
pointInRun = pointInRunUserSpace;
|
||
hit = run;
|
||
} else if (nsLayoutUtils::PointIsCloserToRect(pointInRunUserSpace, runRect,
|
||
dx, dy)) {
|
||
// The point was closer to this rendered run's rect than any others
|
||
// we've seen so far.
|
||
pointInRun.x =
|
||
std::clamp(pointInRunUserSpace.x.value, runRect.X(), runRect.XMost());
|
||
pointInRun.y =
|
||
std::clamp(pointInRunUserSpace.y.value, runRect.Y(), runRect.YMost());
|
||
hit = run;
|
||
}
|
||
}
|
||
|
||
if (!hit.mFrame) {
|
||
// We didn't find any rendered runs for the frame.
|
||
return aPoint;
|
||
}
|
||
|
||
// Return the point in user units relative to the nsTextFrame,
|
||
// but taking into account mFontSizeScaleFactor.
|
||
gfxMatrix m = hit.GetTransformFromRunUserSpaceToFrameUserSpace(presContext);
|
||
m.PreScale(mFontSizeScaleFactor, mFontSizeScaleFactor);
|
||
return ToPoint(m.TransformPoint(pointInRun) / cssPxPerDevPx);
|
||
}
|
||
|
||
/**
|
||
* For each rendered run beneath aChildFrame, translate aRect from
|
||
* aChildFrame to the run's text frame, transform it then into
|
||
* the run's frame user space, intersect it with the run's
|
||
* frame user space rect, then transform it up to user space.
|
||
* The result is the union of all of these.
|
||
*/
|
||
gfxRect SVGTextFrame::TransformFrameRectFromTextChild(
|
||
const nsRect& aRect, const nsIFrame* aChildFrame) {
|
||
NS_ASSERTION(aChildFrame && nsLayoutUtils::GetClosestFrameOfType(
|
||
aChildFrame->GetParent(),
|
||
LayoutFrameType::SVGText) == this,
|
||
"aChildFrame must be a descendant of this frame");
|
||
|
||
UpdateGlyphPositioning();
|
||
|
||
nsPresContext* presContext = PresContext();
|
||
|
||
gfxRect result;
|
||
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
|
||
aChildFrame);
|
||
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
|
||
// First, translate aRect from aChildFrame to this run's frame.
|
||
nsRect rectInTextFrame = aRect + aChildFrame->GetOffsetTo(run.mFrame);
|
||
|
||
// Scale it into frame user space.
|
||
gfxRect rectInFrameUserSpace = AppUnitsToFloatCSSPixels(
|
||
gfxRect(rectInTextFrame.x, rectInTextFrame.y, rectInTextFrame.width,
|
||
rectInTextFrame.height),
|
||
presContext);
|
||
|
||
// Intersect it with the run.
|
||
uint32_t flags =
|
||
TextRenderedRun::eIncludeFill | TextRenderedRun::eIncludeStroke;
|
||
|
||
if (rectInFrameUserSpace.IntersectRect(
|
||
rectInFrameUserSpace,
|
||
run.GetFrameUserSpaceRect(presContext, flags).ToThebesRect())) {
|
||
// Transform it up to user space of the <text>
|
||
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
|
||
gfxRect rectInUserSpace = m.TransformRect(rectInFrameUserSpace);
|
||
|
||
// Union it into the result.
|
||
result.UnionRect(result, rectInUserSpace);
|
||
}
|
||
}
|
||
|
||
// Subtract the mRect offset from the result, as our user space for
|
||
// this frame is relative to the top-left of mRect.
|
||
float factor = AppUnitsPerCSSPixel();
|
||
gfxPoint framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
|
||
NSAppUnitsToFloatPixels(mRect.y, factor));
|
||
|
||
return result - framePosition;
|
||
}
|
||
|
||
Rect SVGTextFrame::TransformFrameRectFromTextChild(
|
||
const Rect& aRect, const nsIFrame* aChildFrame) {
|
||
nscoord appUnitsPerDevPixel = PresContext()->AppUnitsPerDevPixel();
|
||
nsRect r = LayoutDevicePixel::ToAppUnits(
|
||
LayoutDeviceRect::FromUnknownRect(aRect), appUnitsPerDevPixel);
|
||
gfxRect resultCssUnits = TransformFrameRectFromTextChild(r, aChildFrame);
|
||
float devPixelPerCSSPixel =
|
||
float(AppUnitsPerCSSPixel()) / appUnitsPerDevPixel;
|
||
resultCssUnits.Scale(devPixelPerCSSPixel);
|
||
return ToRect(resultCssUnits);
|
||
}
|
||
|
||
Point SVGTextFrame::TransformFramePointFromTextChild(
|
||
const Point& aPoint, const nsIFrame* aChildFrame) {
|
||
return TransformFrameRectFromTextChild(Rect(aPoint, Size(1, 1)), aChildFrame)
|
||
.TopLeft();
|
||
}
|
||
|
||
void SVGTextFrame::AppendDirectlyOwnedAnonBoxes(
|
||
nsTArray<OwnedAnonBox>& aResult) {
|
||
MOZ_ASSERT(PrincipalChildList().FirstChild(), "Must have our anon box");
|
||
aResult.AppendElement(OwnedAnonBox(PrincipalChildList().FirstChild()));
|
||
}
|
||
|
||
} // namespace mozilla
|