gecko/layout/svg/nsSVGTextFrame2.cpp

5179 lines
162 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Main header first:
#include "nsSVGTextFrame.h"
// Keep others in (case-insensitive) order:
#include "DOMSVGPoint.h"
#include "gfxFont.h"
#include "gfxSkipChars.h"
#include "gfxTypes.h"
#include "LookAndFeel.h"
#include "nsAlgorithm.h"
#include "nsBlockFrame.h"
#include "nsCaret.h"
#include "nsContentUtils.h"
#include "nsGkAtoms.h"
#include "nsIDOMSVGAnimatedNumber.h"
#include "nsIDOMSVGLength.h"
#include "nsIDOMSVGRect.h"
#include "nsISVGGlyphFragmentNode.h"
#include "nsISelection.h"
#include "nsQuickSort.h"
#include "nsRenderingContext.h"
#include "nsSVGEffects.h"
#include "nsSVGGlyphFrame.h"
#include "nsSVGOuterSVGFrame.h"
#include "nsSVGPaintServerFrame.h"
#include "nsSVGRect.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGTextFrame2.h"
#include "nsSVGTextPathFrame.h"
#include "nsSVGUtils.h"
#include "nsTArray.h"
#include "nsTextFrame.h"
#include "nsTextNode.h"
#include "SVGAnimatedNumberList.h"
#include "SVGContentUtils.h"
#include "SVGLengthList.h"
#include "SVGNumberList.h"
#include "SVGPathElement.h"
#include "SVGTextPathElement.h"
#include <algorithm>
#include <cmath>
#include <limits>
using namespace mozilla;
// ============================================================================
// Utility functions
/**
* Using the specified gfxSkipCharsIterator, converts an offset and length
* in original char indexes to skipped char indexes.
*
* @param aIterator The gfxSkipCharsIterator to use for the conversion.
* @param aOriginalOffset The original offset (input).
* @param aOriginalLength The original length (input).
* @param aSkippedOffset The skipped offset (output).
* @param aSkippedLength The skipped length (output).
*/
static void
ConvertOriginalToSkipped(gfxSkipCharsIterator& aIterator,
uint32_t aOriginalOffset, uint32_t aOriginalLength,
uint32_t& aSkippedOffset, uint32_t& aSkippedLength)
{
aSkippedOffset = aIterator.ConvertOriginalToSkipped(aOriginalOffset);
aIterator.AdvanceOriginal(aOriginalLength);
aSkippedLength = aIterator.GetSkippedOffset() - aSkippedOffset;
}
/**
* Using the specified gfxSkipCharsIterator, converts an offset and length
* in original char indexes to skipped char indexes in place.
*
* @param aIterator The gfxSkipCharsIterator to use for the conversion.
* @param aOriginalOffset The offset to convert from original to skipped.
* @param aOriginalLength The length to convert from original to skipped.
*/
static void
ConvertOriginalToSkipped(gfxSkipCharsIterator& aIterator,
uint32_t& aOffset, uint32_t& aLength)
{
ConvertOriginalToSkipped(aIterator, aOffset, aLength, aOffset, aLength);
}
/**
* Converts an nsPoint from app units to user space units using the specified
* nsPresContext and returns it as a gfxPoint.
*/
static gfxPoint
AppUnitsToGfxUnits(const nsPoint& aPoint, const nsPresContext* aContext)
{
return gfxPoint(aContext->AppUnitsToGfxUnits(aPoint.x),
aContext->AppUnitsToGfxUnits(aPoint.y));
}
/**
* Converts a gfxRect that is in app units to CSS pixels using the specified
* nsPresContext and returns it as a gfxRect.
*/
static gfxRect
AppUnitsToFloatCSSPixels(const gfxRect& aRect, const nsPresContext* aContext)
{
return gfxRect(aContext->AppUnitsToFloatCSSPixels(aRect.x),
aContext->AppUnitsToFloatCSSPixels(aRect.y),
aContext->AppUnitsToFloatCSSPixels(aRect.width),
aContext->AppUnitsToFloatCSSPixels(aRect.height));
}
/**
* Scales a gfxRect around a given point.
*
* @param aRect The rectangle to scale.
* @param aPoint The point around which to scale.
* @param aScale The scale amount.
*/
static void
ScaleAround(gfxRect& aRect, const gfxPoint& aPoint, double aScale)
{
aRect.x = aPoint.x - aScale * (aPoint.x - aRect.x);
aRect.y = aPoint.y - aScale * (aPoint.y - aRect.y);
aRect.width *= aScale;
aRect.height *= aScale;
}
/**
* Returns whether a gfxPoint lies within a gfxRect.
*/
static bool
Inside(const gfxRect& aRect, const gfxPoint& aPoint)
{
return aPoint.x >= aRect.x &&
aPoint.x < aRect.XMost() &&
aPoint.y >= aRect.y &&
aPoint.y < aRect.YMost();
}
/**
* Gets the measured ascent and descent of the text in the given nsTextFrame
* in app units.
*
* @param aFrame The text frame.
* @param aAscent The ascent in app units (output).
* @param aDescent The descent in app units (output).
*/
static void
GetAscentAndDescentInAppUnits(nsTextFrame* aFrame,
gfxFloat& aAscent, gfxFloat& aDescent)
{
gfxSkipCharsIterator it = aFrame->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = aFrame->GetTextRun(nsTextFrame::eInflated);
uint32_t offset, length;
ConvertOriginalToSkipped(it,
aFrame->GetContentOffset(),
aFrame->GetContentLength(),
offset, length);
gfxTextRun::Metrics metrics =
textRun->MeasureText(offset, length, gfxFont::LOOSE_INK_EXTENTS, nullptr,
nullptr);
aAscent = metrics.mAscent;
aDescent = metrics.mDescent;
}
/**
* Updates an interval by intersecting it with another interval.
* The intervals are specified using a start index and a length.
*/
static void
IntersectInterval(uint32_t& aStart, uint32_t& aLength,
uint32_t aStartOther, uint32_t aLengthOther)
{
uint32_t aEnd = aStart + aLength;
uint32_t aEndOther = aStartOther + aLengthOther;
if (aStartOther >= aEnd || aStart >= aEndOther) {
aLength = 0;
} else {
if (aStartOther >= aStart)
aStart = aStartOther;
aLength = std::min(aEnd, aEndOther) - aStart;
}
}
/**
* Intersects an interval as IntersectInterval does but by taking
* the offset and length of the other interval from a
* nsTextFrame::TrimmedOffsets object.
*/
static void
TrimOffsets(uint32_t& aStart, uint32_t& aLength,
const nsTextFrame::TrimmedOffsets& aTrimmedOffsets)
{
IntersectInterval(aStart, aLength,
aTrimmedOffsets.mStart, aTrimmedOffsets.mLength);
}
/**
* Returns the closest ancestor-or-self node that is not an SVG <a>
* element.
*/
static nsIContent*
GetFirstNonAAncestor(nsIContent* aContent)
{
while (aContent && aContent->IsSVG(nsGkAtoms::a)) {
aContent = aContent->GetParent();
}
return aContent;
}
/**
* Returns whether the given node is a text content element[1], taking into
* account whether it has a valid parent.
*
* For example, in:
*
* <svg xmlns="http://www.w3.org/2000/svg">
* <text><a/><text/></text>
* <tspan/>
* </svg>
*
* true would be returned for the outer <text> element and the <a> element,
* and false for the inner <text> element (since a <text> is not allowed
* to be a child of another <text>) and the <tspan> element (because it
* must be inside a <text> subtree).
*
* Note that we don't support the <tref> element yet and this function
* returns false for it.
*
* [1] https://svgwg.org/svg2-draft/intro.html#TermTextContentElement
*/
static bool
IsTextContentElement(nsIContent* aContent)
{
if (!aContent->IsSVG()) {
return false;
}
if (aContent->Tag() == nsGkAtoms::text) {
nsIContent* parent = GetFirstNonAAncestor(aContent->GetParent());
return !parent || !IsTextContentElement(parent);
}
if (aContent->Tag() == nsGkAtoms::textPath) {
nsIContent* parent = GetFirstNonAAncestor(aContent->GetParent());
return parent && parent->IsSVG(nsGkAtoms::text);
}
if (aContent->Tag() == nsGkAtoms::a ||
aContent->Tag() == nsGkAtoms::tspan ||
aContent->Tag() == nsGkAtoms::altGlyph) {
return true;
}
return false;
}
/**
* Returns whether the specified frame is an nsTextFrame that has some text
* content.
*/
static bool
IsNonEmptyTextFrame(nsIFrame* aFrame)
{
nsTextFrame* textFrame = do_QueryFrame(aFrame);
if (!textFrame) {
return false;
}
return textFrame->GetContentLength() != 0;
}
/**
* Takes an nsIFrame and if it is a text frame that has some text content,
* returns it as an nsTextFrame and its corresponding nsTextNode.
*
* @param aFrame The frame to look at.
* @param aTextFrame aFrame as an nsTextFrame (output).
* @param aTextNode The nsTextNode content of aFrame (output).
* @return true if aFrame is a non-empty text frame, false otherwise.
*/
static bool
GetNonEmptyTextFrameAndNode(nsIFrame* aFrame,
nsTextFrame*& aTextFrame,
nsTextNode*& aTextNode)
{
nsTextFrame* text = do_QueryFrame(aFrame);
if (!text) {
return false;
}
nsIContent* content = text->GetContent();
NS_ASSERTION(content && content->IsNodeOfType(nsINode::eTEXT),
"unexpected content type for nsTextFrame");
nsTextNode* node = static_cast<nsTextNode*>(content);
if (node->TextLength() == 0) {
return false;
}
aTextFrame = text;
aTextNode = node;
return true;
}
/**
* Returns whether the specified atom is for one of the five
* glyph positioning attributes that can appear on SVG text
* elements -- x, y, dx, dy or rotate.
*/
static bool
IsGlyphPositioningAttribute(nsIAtom* aAttribute)
{
return aAttribute == nsGkAtoms::x ||
aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::dx ||
aAttribute == nsGkAtoms::dy ||
aAttribute == nsGkAtoms::rotate;
}
/**
* Returns the position in app units of a given baseline (using an
* SVG dominant-baseline property value) for a given nsTextFrame.
*
* @param aFrame The text frame to inspect.
* @param aTextRun The text run of aFrame.
* @param aDominantBaseline The dominant-baseline value to use.
*/
static nscoord
GetBaselinePosition(nsTextFrame* aFrame,
gfxTextRun* aTextRun,
uint8_t aDominantBaseline)
{
switch (aDominantBaseline) {
case NS_STYLE_DOMINANT_BASELINE_HANGING:
case NS_STYLE_DOMINANT_BASELINE_TEXT_BEFORE_EDGE:
return 0;
case NS_STYLE_DOMINANT_BASELINE_USE_SCRIPT:
case NS_STYLE_DOMINANT_BASELINE_NO_CHANGE:
case NS_STYLE_DOMINANT_BASELINE_RESET_SIZE:
// These three should not simply map to 'baseline', but we don't
// support the complex baseline model that SVG 1.1 has and which
// css3-linebox now defines.
// (fall through)
case NS_STYLE_DOMINANT_BASELINE_AUTO:
case NS_STYLE_DOMINANT_BASELINE_ALPHABETIC:
return aFrame->GetBaseline();
}
gfxTextRun::Metrics metrics =
aTextRun->MeasureText(0, aTextRun->GetLength(), gfxFont::LOOSE_INK_EXTENTS,
nullptr, nullptr);
switch (aDominantBaseline) {
case NS_STYLE_DOMINANT_BASELINE_TEXT_AFTER_EDGE:
case NS_STYLE_DOMINANT_BASELINE_IDEOGRAPHIC:
return metrics.mAscent + metrics.mDescent;
case NS_STYLE_DOMINANT_BASELINE_CENTRAL:
case NS_STYLE_DOMINANT_BASELINE_MIDDLE:
case NS_STYLE_DOMINANT_BASELINE_MATHEMATICAL:
return (metrics.mAscent + metrics.mDescent) / 2.0;
}
NS_NOTREACHED("unexpected dominant-baseline value");
return aFrame->GetBaseline();
}
/**
* For a given text run, returns the number of skipped characters that comprise
* the ligature group and/or cluster that includes the character represented
* by the specified gfxSkipCharsIterator.
*
* @param aTextRun The text run to use for determining whether a given character
* is part of a ligature or cluster.
* @param aIterator The gfxSkipCharsIterator to use for the current position
* in the text run.
*/
static uint32_t
ClusterLength(gfxTextRun* aTextRun, const gfxSkipCharsIterator& aIterator)
{
uint32_t start = aIterator.GetSkippedOffset();
uint32_t end = start + 1;
while (end < aTextRun->GetLength() &&
(!aTextRun->IsLigatureGroupStart(end) ||
!aTextRun->IsClusterStart(end))) {
end++;
}
return end - start;
}
/**
* Truncates an array to be at most the length of another array.
*
* @param aArrayToTruncate The array to truncate.
* @param aReferenceArray The array whose length will be used to truncate
* aArrayToTruncate to.
*/
template<typename T, typename U>
static void
TruncateTo(nsTArray<T>& aArrayToTruncate, const nsTArray<U>& aReferenceArray)
{
uint32_t length = aReferenceArray.Length();
if (aArrayToTruncate.Length() > length) {
aArrayToTruncate.TruncateLength(length);
}
}
// ============================================================================
// Utility classes
namespace mozilla {
// ----------------------------------------------------------------------------
// TextRenderedRun
/**
* A run of text within a single nsTextFrame whose glyphs can all be painted
* 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:
*
* - 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
*
* A TextRenderedRunIterator produces TextRenderedRuns required for painting a
* whole nsSVGTextFrame2.
*/
struct TextRenderedRun
{
/**
* 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,
double aRotate, float aFontSizeScaleFactor, nscoord aBaseline,
uint32_t aTextFrameContentOffset,
uint32_t aTextFrameContentLength,
uint32_t aTextElementCharIndex)
: mFrame(aFrame),
mPosition(aPosition),
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 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
* nsSVGTextFrame2::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.
* @param aItem The nsCharClipDisplayItem that holds the amount of clipping
* from the left and right edges of the text frame for this rendered run.
* An appropriate nsCharClipDisplayItem can be obtained by constructing an
* SVGCharClipDisplayItem for the TextRenderedRun.
*/
gfxMatrix GetTransformFromUserSpaceForPainting(
nsPresContext* aContext,
const nsCharClipDisplayItem& aItem) 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.
*/
gfxRect 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.
*/
gfxRect 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.
*/
gfxRect 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& aLeftEdge, nscoord& aRightEdge) 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.
*
* 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.
*/
gfxPoint mPosition;
/**
* 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.
*/
nscoord mBaseline;
/**
* The offset and length in mFrame's content nsTextNode 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 nsCharClipDisplayItem& aItem) 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 = aContext->
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
// Glyph position in user space.
m.Translate(mPosition / cssPxPerDevPx);
// Take into account any font size scaling.
m.Scale(1.0 / mFontSizeScaleFactor, 1.0 / mFontSizeScaleFactor);
// Rotation due to rotate="" or a <textPath>.
m.Rotate(mRotate);
// Translation to get the text frame in the right place.
nsPoint t(IsRightToLeft() ?
-mFrame->GetRect().width + aItem.mRightEdge :
-aItem.mLeftEdge,
-mBaseline);
m.Translate(AppUnitsToGfxUnits(t, aContext));
return m;
}
gfxMatrix
TextRenderedRun::GetTransformFromRunUserSpaceToUserSpace(
nsPresContext* aContext) const
{
gfxMatrix m;
if (!mFrame) {
return m;
}
float cssPxPerDevPx = aContext->
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
nscoord left, right;
GetClipEdges(left, right);
// Glyph position in user space.
m.Translate(mPosition);
// Rotation due to rotate="" or a <textPath>.
m.Rotate(mRotate);
// Translation to get the text frame in the right place.
nsPoint t(IsRightToLeft() ?
-mFrame->GetRect().width + left + right :
0,
-mBaseline);
m.Translate(AppUnitsToGfxUnits(t, aContext) *
cssPxPerDevPx / mFontSizeScaleFactor);
return m;
}
gfxMatrix
TextRenderedRun::GetTransformFromRunUserSpaceToFrameUserSpace(
nsPresContext* aContext) const
{
gfxMatrix m;
if (!mFrame) {
return m;
}
nscoord left, right;
GetClipEdges(left, right);
// Translate by the horizontal distance into the text frame this
// rendered run is.
return m.Translate(gfxPoint(gfxFloat(left) / aContext->AppUnitsPerCSSPixel(),
0));
}
gfxRect
TextRenderedRun::GetRunUserSpaceRect(nsPresContext* aContext,
uint32_t aFlags) const
{
gfxRect r;
if (!mFrame) {
return r;
}
// Determine the amount of overflow above and below the frame's mRect.
//
// We need to call GetVisualOverflowRectRelativeToSelf because this includes
// overflowing decorations, which the MeasureText call below does not. We
// assume here the decorations only overflow above and below the frame, never
// horizontally.
nsRect self = mFrame->GetVisualOverflowRectRelativeToSelf();
nsRect rect = mFrame->GetRect();
nscoord above = -self.y;
nscoord below = self.YMost() - rect.height;
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
// Get the content range for this rendered run.
uint32_t offset, length;
ConvertOriginalToSkipped(it, mTextFrameContentOffset, mTextFrameContentLength,
offset, length);
// Measure that range.
gfxTextRun::Metrics metrics =
textRun->MeasureText(offset, length, gfxFont::LOOSE_INK_EXTENTS,
nullptr, nullptr);
// Determine the rectangle that covers the rendered run's fill,
// taking into account the measured vertical overflow due to
// decorations.
nscoord baseline = metrics.mBoundingBox.y + metrics.mAscent;
gfxFloat x, width;
if (aFlags & eNoHorizontalOverflow) {
x = 0.0;
width = textRun->GetAdvanceWidth(offset, length, nullptr);
} else {
x = metrics.mBoundingBox.x;
width = metrics.mBoundingBox.width;
}
gfxRect fillInAppUnits(x, baseline - above,
width, metrics.mBoundingBox.height + above + below);
// Convert the app units rectangle to user units.
gfxRect fill = AppUnitsToFloatCSSPixels(fillInAppUnits, aContext);
// Scale the rectangle up due to any mFontSizeScaleFactor. We scale
// it around the text's origin.
ScaleAround(fill,
gfxPoint(0.0, aContext->AppUnitsToFloatCSSPixels(baseline)),
1.0 / mFontSizeScaleFactor);
// Include the fill if requested.
if (aFlags & eIncludeFill) {
r = fill;
}
// Include the stroke if requested.
if ((aFlags & eIncludeStroke) &&
nsSVGUtils::GetStrokeWidth(mFrame) > 0) {
r = r.Union(nsSVGUtils::PathExtentsToMaxStrokeExtents(fill, mFrame,
gfxMatrix()));
}
return r;
}
gfxRect
TextRenderedRun::GetFrameUserSpaceRect(nsPresContext* aContext,
uint32_t aFlags) const
{
gfxRect r = GetRunUserSpaceRect(aContext, aFlags);
gfxMatrix m = GetTransformFromRunUserSpaceToFrameUserSpace(aContext);
return m.TransformBounds(r);
}
gfxRect
TextRenderedRun::GetUserSpaceRect(nsPresContext* aContext,
uint32_t aFlags,
const gfxMatrix* aAdditionalTransform) const
{
gfxRect r = GetRunUserSpaceRect(aContext, aFlags);
gfxMatrix m = GetTransformFromRunUserSpaceToUserSpace(aContext);
if (aAdditionalTransform) {
m.Multiply(*aAdditionalTransform);
}
return m.TransformBounds(r);
}
void
TextRenderedRun::GetClipEdges(nscoord& aLeftEdge, nscoord& aRightEdge) 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.
aLeftEdge = 0;
aRightEdge = 0;
return;
}
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
// Get the covered content offset/length for this rendered run in skipped
// characters, since that is what GetAdvanceWidth expects.
uint32_t runOffset, runLength, frameOffset, frameLength;
ConvertOriginalToSkipped(it, mTextFrameContentOffset, mTextFrameContentLength,
runOffset, runLength);
// Get the offset/length of the whole nsTextFrame.
frameOffset = mFrame->GetContentOffset();
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->GetContent()->GetText(), true);
TrimOffsets(frameOffset, frameLength, trimmedOffsets);
// Convert the trimmed whole-nsTextFrame offset/length into skipped
// characters.
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 leftEdge =
textRun->GetAdvanceWidth(frameOffset, runOffset - frameOffset, nullptr);
// and between the end of the rendered run's content and the end
// of the frame's content.
nscoord rightEdge =
textRun->GetAdvanceWidth(runOffset + runLength,
frameOffset + frameLength - (runOffset + runLength),
nullptr);
if (textRun->IsRightToLeft()) {
aLeftEdge = rightEdge;
aRightEdge = leftEdge;
} else {
aLeftEdge = leftEdge;
aRightEdge = rightEdge;
}
}
nscoord
TextRenderedRun::GetAdvanceWidth() const
{
gfxSkipCharsIterator it = mFrame->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = mFrame->GetTextRun(nsTextFrame::eInflated);
uint32_t offset, length;
ConvertOriginalToSkipped(it, mTextFrameContentOffset, mTextFrameContentLength,
offset, length);
return textRun->GetAdvanceWidth(offset, length, nullptr);
}
int32_t
TextRenderedRun::GetCharNumAtPosition(nsPresContext* aContext,
const gfxPoint& aPoint) const
{
if (mTextFrameContentLength == 0) {
return -1;
}
// Convert the point from user space into run user space, and take
// into account any mFontSizeScaleFactor.
gfxMatrix m = GetTransformFromRunUserSpaceToUserSpace(aContext).Invert();
gfxPoint p = m.Transform(aPoint) * mFontSizeScaleFactor;
// First check that the point lies vertically between the top and bottom
// edges of the text.
gfxFloat ascent, descent;
GetAscentAndDescentInAppUnits(mFrame, ascent, descent);
gfxFloat topEdge = mFrame->GetBaseline() - 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);
// Next check that the point lies horizontally within the left and right
// edges of the text.
uint32_t offset, length;
ConvertOriginalToSkipped(it, mTextFrameContentOffset, mTextFrameContentLength,
offset, length);
gfxFloat runAdvance =
aContext->AppUnitsToGfxUnits(textRun->GetAdvanceWidth(offset, length,
nullptr));
if (p.x < 0 || p.x >= 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--) {
ConvertOriginalToSkipped(it, mTextFrameContentOffset, i, offset, length);
gfxFloat advance =
aContext->AppUnitsToGfxUnits(textRun->GetAdvanceWidth(offset, length,
nullptr));
if ((rtl && p.x < runAdvance - advance) ||
(!rtl && p.x >= advance)) {
return i;
}
}
return -1;
}
// ----------------------------------------------------------------------------
// TextNodeIterator
enum SubtreePosition
{
eBeforeSubtree,
eWithinSubtree,
eAfterSubtree
};
/**
* An iterator class for nsTextNodes 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.
*/
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->IsNodeOfType(nsINode::eTEXT)) {
Next();
}
}
/**
* Returns the current nsTextNode, or null if the iterator has finished.
*/
nsTextNode* Current() const
{
return static_cast<nsTextNode*>(mCurrent);
}
/**
* Advances to the next nsTextNode and returns it, or null if the end of
* iteration has been reached.
*/
nsTextNode* 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 nsTextNodes will be iterated over.
*/
nsIContent* mRoot;
/**
* The node rooting the subtree to track.
*/
nsIContent* mSubtree;
/**
* The current node during iteration.
*/
nsIContent* mCurrent;
/**
* The current iterator position relative to mSubtree.
*/
SubtreePosition mSubtreePosition;
};
nsTextNode*
TextNodeIterator::Next()
{
// Starting from mCurrent, we do a non-recursive traversal to the next
// nsTextNode 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->IsNodeOfType(nsINode::eTEXT));
}
return static_cast<nsTextNode*>(mCurrent);
}
// ----------------------------------------------------------------------------
// 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
{
TextNodeCorrespondence(uint32_t aUndisplayedCharacters)
: mUndisplayedCharacters(aUndisplayedCharacters)
{
}
uint32_t mUndisplayedCharacters;
};
static void DestroyTextNodeCorrespondence(void* aPropertyValue)
{
delete static_cast<TextNodeCorrespondence*>(aPropertyValue);
}
NS_DECLARE_FRAME_PROPERTY(TextNodeCorrespondenceProperty, DestroyTextNodeCorrespondence)
/**
* Returns the number of undisplayed characters before the specified
* nsTextFrame.
*/
static uint32_t
GetUndisplayedCharactersBeforeFrame(nsTextFrame* aFrame)
{
void* value = aFrame->Properties().Get(TextNodeCorrespondenceProperty());
TextNodeCorrespondence* correspondence =
static_cast<TextNodeCorrespondence*>(value);
if (!correspondence) {
NS_NOTREACHED("expected a TextNodeCorrespondenceProperty on nsTextFrame "
"used for SVG text");
return 0;
}
return correspondence->mUndisplayedCharacters;
}
/**
* Traverses the nsTextFrames for an nsSVGTextFrame2 and records a
* TextNodeCorrespondenceProperty on each for the number of undisplayed DOM
* characters between each frame. This is done by iterating simultaenously
* over the nsTextNodes and nsTextFrames and noting when nsTextNodes (or
* parts of them) are skipped when finding the next nsTextFrame.
*/
class TextNodeCorrespondenceRecorder
{
public:
/**
* Entry point for the TextNodeCorrespondenceProperty recording.
*/
static void RecordCorrespondence(nsSVGTextFrame2* aRoot);
private:
TextNodeCorrespondenceRecorder(nsSVGTextFrame2* aRoot)
: mNodeIterator(aRoot->GetContent()),
mPreviousNode(nullptr),
mNodeCharIndex(0)
{
}
void Record(nsSVGTextFrame2* aRoot);
void TraverseAndRecord(nsIFrame* aFrame);
/**
* Returns the next non-empty nsTextNode.
*/
nsTextNode* NextNode();
/**
* The iterator over the nsTextNodes that we use as we simultaneously
* iterate over the nsTextFrames.
*/
TextNodeIterator mNodeIterator;
/**
* The previous nsTextNode we iterated over.
*/
nsTextNode* mPreviousNode;
/**
* The index into the current nsTextNode's character content.
*/
uint32_t mNodeCharIndex;
};
/* static */ void
TextNodeCorrespondenceRecorder::RecordCorrespondence(nsSVGTextFrame2* aRoot)
{
TextNodeCorrespondenceRecorder recorder(aRoot);
recorder.Record(aRoot);
}
void
TextNodeCorrespondenceRecorder::Record(nsSVGTextFrame2* aRoot)
{
if (!mNodeIterator.Current()) {
// If there are no nsTextNodes 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 an nsTextNode. 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 nsTextNodes that we iterate must also be undisplayed.
for (nsTextNode* textNode = mNodeIterator.Current();
textNode;
textNode = NextNode()) {
undisplayed += textNode->TextLength();
}
}
// Record the trailing number of undisplayed characters on the
// nsSVGTextFrame2.
aRoot->mTrailingUndisplayedCharacters = undisplayed;
}
nsTextNode*
TextNodeCorrespondenceRecorder::NextNode()
{
mPreviousNode = mNodeIterator.Current();
nsTextNode* 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->GetFirstPrincipalChild();
f;
f = f->GetNextSibling()) {
TraverseAndRecord(f);
}
return;
}
nsTextFrame* frame; // The current text frame.
nsTextNode* 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()) {
NS_NOTREACHED("incorrect tracking of correspondence between text frames "
"and text nodes");
} else {
// Each whole nsTextNode 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 nsTextNode are
// undisplayed.
undisplayed = mPreviousNode->TextLength() - mNodeCharIndex;
}
// Each whole nsTextNode we find before we get to the text node for
// the current text frame must be undisplayed.
while (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->Properties().Set(TextNodeCorrespondenceProperty(),
new TextNodeCorrespondence(undisplayed));
// Remember how far into the current nsTextNode we are.
mNodeCharIndex = frame->GetContentEnd();
}
// ----------------------------------------------------------------------------
// TextFrameIterator
/**
* An iterator class for nsTextFrames that are descendants of an
* nsSVGTextFrame2. 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 nsSVGTextFrame2'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 TextFrameIterator
{
public:
/**
* Constructs a TextFrameIterator for the specified nsSVGTextFrame2
* with an optional frame subtree to restrict iterated text frames to.
*/
TextFrameIterator(nsSVGTextFrame2* aRoot, nsIFrame* aSubtree = nullptr)
: mRootFrame(aRoot),
mSubtree(aSubtree),
mCurrentFrame(aRoot),
mCurrentPosition(),
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree)
{
Init();
}
/**
* Constructs a TextFrameIterator for the specified nsSVGTextFrame2
* with an optional frame content subtree to restrict iterated text frames to.
*/
TextFrameIterator(nsSVGTextFrame2* aRoot, nsIContent* aSubtree)
: mRootFrame(aRoot),
mSubtree(aSubtree && aSubtree != aRoot->GetContent() ?
aSubtree->GetPrimaryFrame() :
nullptr),
mCurrentFrame(aRoot),
mCurrentPosition(),
mSubtreePosition(mSubtree ? eBeforeSubtree : eWithinSubtree)
{
Init();
}
/**
* Returns the root nsSVGTextFrame2 this TextFrameIterator is iterating over.
*/
nsSVGTextFrame2* 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 nsSVGTextFrame2'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.ElementAt(mTextPathFrames.Length() - 1);
}
/**
* Returns the current frame's computed dominant-baseline value.
*/
uint8_t DominantBaseline() const
{
return mBaselines.ElementAt(mBaselines.Length() - 1);
}
/**
* Finishes the iterator.
*/
void Close()
{
mCurrentFrame = nullptr;
}
private:
/**
* Initializes the iterator and advances to the first item.
*/
void Init()
{
mBaselines.AppendElement(mRootFrame->StyleSVGReset()->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.
*/
nsSVGTextFrame2* mRootFrame;
/**
* The frame for the subtree we are also interested in tracking.
*/
nsIFrame* 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.
*/
nsAutoTArray<nsIFrame*, 1> mTextPathFrames;
/**
* Stack of dominant-baseline values to record as we traverse through the
* frame tree.
*/
nsAutoTArray<uint8_t, 8> mBaselines;
/**
* The iterator's current position relative to mSubtree.
*/
SubtreePosition mSubtreePosition;
};
uint32_t
TextFrameIterator::UndisplayedCharacters() const
{
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->GetFirstPrincipalChild() :
nullptr;
if (next) {
// Descend into this frame, and accumulate its position.
mCurrentPosition += next->GetPosition();
if (next->GetContent()->Tag() == 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()->Tag() == nsGkAtoms::textPath) {
// Pop off the <textPath> frame if this is a <textPath>.
mTextPathFrames.TruncateLength(mTextPathFrames.Length() - 1);
}
// 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()->Tag() == 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)
{
uint8_t baseline = aNextFrame->StyleSVGReset()->mDominantBaseline;
if (baseline != NS_STYLE_DOMINANT_BASELINE_AUTO) {
mBaselines.AppendElement(baseline);
} else {
mBaselines.AppendElement(mBaselines[mBaselines.Length() - 1]);
}
}
void
TextFrameIterator::PopBaseline()
{
NS_ASSERTION(!mBaselines.IsEmpty(), "popped too many baselines");
mBaselines.TruncateLength(mBaselines.Length() - 1);
}
// -----------------------------------------------------------------------------
// TextRenderedRunIterator
/**
* Iterator for TextRenderedRun objects for the nsSVGTextFrame2.
*/
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 nsSVGTextFrame2 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.
*/
TextRenderedRunIterator(nsSVGTextFrame2* aSVGTextFrame,
RenderedRunFilter aFilter = eAllFrames,
nsIFrame* aSubtree = nullptr)
: mFrameIterator(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 nsSVGTextFrame2 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(nsSVGTextFrame2* aSVGTextFrame,
RenderedRunFilter aFilter,
nsIContent* aSubtree)
: mFrameIterator(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 nsSVGTextFrame2 this iterator is for.
*/
nsSVGTextFrame2* 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();
// Get the character index for the start of this rendered run, by skipping
// any undisplayed characters.
if (frame != mCurrent.mFrame) {
mFrameStartTextElementCharIndex += mFrameIterator.UndisplayedCharacters();
mTextElementCharIndex += mFrameIterator.UndisplayedCharacters();
}
charIndex = mTextElementCharIndex;
// Get the position and rotation of the character that begins this
// rendered run.
pt = Root()->mPositions[mTextElementCharIndex].mPosition;
rotate = Root()->mPositions[mTextElementCharIndex].mAngle;
// Find the end of the rendered run, by looking through the
// nsSVGTextFrame2'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 nsTextNode.
offset = frame->GetContentOffset() + runStart -
mFrameStartTextElementCharIndex;
length = runEnd - runStart;
// If the end of the frame's content comes before the run boundary we found
// in nsSVGTextFrame2'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());
// 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->GetContent()->GetText(), true);
TrimOffsets(offset, length, trimmedOffsets);
charIndex += offset - untrimmedOffset;
// 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();
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, rotate, mFontSizeScaleFactor, baseline,
offset, length, charIndex);
return mCurrent;
}
TextRenderedRun
TextRenderedRunIterator::First()
{
if (Root()->mPositions.IsEmpty()) {
mFrameIterator.Close();
return TextRenderedRun();
}
return Next();
}
// -----------------------------------------------------------------------------
// CharIterator
/**
* Iterator for characters within an nsSVGTextFrame2.
*/
class CharIterator
{
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 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,
// Iterate only over characters that are the first of clusters or ligature
// groups.
eClusterAndLigatureGroupStart,
// Iterate only over characters that are part of a cluster or ligature
// group but not the first character.
eClusterOrLigatureGroupMiddle
};
/**
* Constructs a CharIterator.
*
* @param aSVGTextFrame The nsSVGTextFrame2 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(nsSVGTextFrame2* aSVGTextFrame,
CharacterFilter aFilter,
nsIContent* aSubtree = nullptr);
/**
* 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, stopping early if we move
* past the subtree (if one was specified in the constructor).
*/
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;
/**
* 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 original character offsets within the nsTextNode for the
* cluster/ligature group the current character is a part of.
*
* @param aOriginalOffset The offset of the start of the cluster/ligature
* group (output).
* @param aOriginalLength The length of cluster/ligature group (output).
*/
void GetOriginalGlyphOffsets(uint32_t& aOriginalOffset,
uint32_t& aOriginalLength) const;
/**
* Gets the advance, in user units, of the glyph the current character is
* part of.
*
* @param aContext The context to use for unit conversions.
*/
gfxFloat GetGlyphAdvance(nsPresContext* aContext) const;
/**
* 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;
/**
* Gets the specified partial advance of the glyph the current character is
* part of.
*
* @param aPartOffset The index of the first character, starting from 0, of
* the cluster/ligature group to measure.
* @param aPartLength The number of characters in the cluster/ligature group
* to measure.
* @param aContext The context to use for unit conversions.
*/
gfxFloat GetGlyphPartialAdvance(uint32_t aPartOffset, uint32_t aPartLength,
nsPresContext* aContext) const;
/**
* Returns the frame corresponding to the <textPath> that the current
* character is within.
*/
nsIFrame* TextPathFrame() const
{
return mFrameIterator.TextPathFrame();
}
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;
/**
* The filter to use.
*/
CharacterFilter mFilter;
/**
* The iterator for text frames.
*/
TextFrameIterator mFrameIterator;
/**
* 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;
};
CharIterator::CharIterator(nsSVGTextFrame2* aSVGTextFrame,
CharIterator::CharacterFilter aFilter,
nsIContent* aSubtree)
: mFilter(aFilter),
mFrameIterator(aSVGTextFrame, aSubtree),
mFrameForTrimCheck(nullptr),
mTrimmedOffset(0),
mTrimmedLength(0),
mTextElementCharIndex(0),
mGlyphStartTextElementCharIndex(0)
{
if (!AtEnd()) {
mSkipCharsIterator = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
mTextRun = TextFrame()->GetTextRun(nsTextFrame::eInflated);
mTextElementCharIndex = mFrameIterator.UndisplayedCharacters();
if (!MatchesFilter()) {
Next();
}
}
}
bool
CharIterator::Next()
{
while (NextCharacter()) {
if (MatchesFilter()) {
return true;
}
}
return false;
}
bool
CharIterator::Next(uint32_t aCount)
{
while (aCount) {
if (!Next()) {
return false;
}
aCount--;
}
return true;
}
void
CharIterator::NextWithinSubtree(uint32_t aCount)
{
while (IsWithinSubtree() && aCount) {
if (!Next()) {
break;
}
aCount--;
}
}
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::IsClusterAndLigatureGroupStart() const
{
return mTextRun->IsLigatureGroupStart(mSkipCharsIterator.GetSkippedOffset()) &&
mTextRun->IsClusterStart(mSkipCharsIterator.GetSkippedOffset());
}
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();
nsIContent* content = mFrameForTrimCheck->GetContent();
nsTextFrame::TrimmedOffsets trim =
mFrameForTrimCheck->GetTrimmedOffsets(content->GetText(), true);
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->GetContent()->GetText()->CharAt(index) == '\n'));
}
void
CharIterator::GetOriginalGlyphOffsets(uint32_t& aOriginalOffset,
uint32_t& aOriginalLength) const
{
gfxSkipCharsIterator it = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
it.SetOriginalOffset(mSkipCharsIterator.GetOriginalOffset() -
(mTextElementCharIndex - mGlyphStartTextElementCharIndex));
while (it.GetSkippedOffset() > 0 &&
(!mTextRun->IsClusterStart(it.GetSkippedOffset()) ||
!mTextRun->IsLigatureGroupStart(it.GetSkippedOffset()))) {
it.AdvanceSkipped(-1);
}
aOriginalOffset = it.GetOriginalOffset();
// Find the end of the cluster/ligature group.
it.SetOriginalOffset(mSkipCharsIterator.GetOriginalOffset());
do {
it.AdvanceSkipped(1);
} while (it.GetSkippedOffset() < mTextRun->GetLength() &&
(!mTextRun->IsClusterStart(it.GetSkippedOffset()) ||
!mTextRun->IsLigatureGroupStart(it.GetSkippedOffset())));
aOriginalLength = it.GetOriginalOffset() - aOriginalOffset;
}
gfxFloat
CharIterator::GetGlyphAdvance(nsPresContext* aContext) const
{
uint32_t offset, length;
GetOriginalGlyphOffsets(offset, length);
gfxSkipCharsIterator it = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
ConvertOriginalToSkipped(it, offset, length);
float cssPxPerDevPx = aContext->
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
gfxFloat advance = mTextRun->GetAdvanceWidth(offset, length, nullptr);
return aContext->AppUnitsToGfxUnits(advance) * cssPxPerDevPx;
}
gfxFloat
CharIterator::GetAdvance(nsPresContext* aContext) const
{
float cssPxPerDevPx = aContext->
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
gfxFloat advance =
mTextRun->GetAdvanceWidth(mSkipCharsIterator.GetSkippedOffset(), 1, nullptr);
return aContext->AppUnitsToGfxUnits(advance) * cssPxPerDevPx;
}
gfxFloat
CharIterator::GetGlyphPartialAdvance(uint32_t aPartOffset, uint32_t aPartLength,
nsPresContext* aContext) const
{
uint32_t offset, length;
GetOriginalGlyphOffsets(offset, length);
NS_ASSERTION(aPartOffset <= length && aPartOffset + aPartLength <= length,
"invalid aPartOffset / aPartLength values");
offset += aPartOffset;
length = aPartLength;
gfxSkipCharsIterator it = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
ConvertOriginalToSkipped(it, offset, length);
float cssPxPerDevPx = aContext->
AppUnitsToFloatCSSPixels(aContext->AppUnitsPerDevPixel());
gfxFloat advance = mTextRun->GetAdvanceWidth(offset, length, nullptr);
return aContext->AppUnitsToGfxUnits(advance) * cssPxPerDevPx;
}
bool
CharIterator::NextCharacter()
{
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.
if (!IsOriginalCharSkipped() && IsClusterAndLigatureGroupStart()) {
// If this is the start of a glyph, record it.
mGlyphStartTextElementCharIndex = mTextElementCharIndex;
}
return true;
}
// Advance to the next frame.
mFrameIterator.Next();
// Skip any undisplayed characters.
mTextElementCharIndex += mFrameIterator.UndisplayedCharacters();
if (!TextFrame()) {
// We're at the end.
mSkipCharsIterator = gfxSkipCharsIterator();
return false;
}
mSkipCharsIterator = TextFrame()->EnsureTextRun(nsTextFrame::eInflated);
mTextRun = TextFrame()->GetTextRun(nsTextFrame::eInflated);
if (!IsOriginalCharSkipped() && IsClusterAndLigatureGroupStart()) {
// If this is the start of a glyph, record it.
mGlyphStartTextElementCharIndex = mTextElementCharIndex;
}
return true;
}
bool
CharIterator::MatchesFilter() const
{
if (mFilter == eOriginal) {
return true;
}
if (IsOriginalCharSkipped()) {
return false;
}
if (mFilter == eAddressable) {
return !IsOriginalCharUnaddressable();
}
return (mFilter == eClusterAndLigatureGroupStart) ==
IsClusterAndLigatureGroupStart();
}
// -----------------------------------------------------------------------------
// nsCharClipDisplayItem
/**
* An nsCharClipDisplayItem that obtains its left and right clip edges from a
* TextRenderedRun object.
*/
class SVGCharClipDisplayItem : public nsCharClipDisplayItem {
public:
SVGCharClipDisplayItem(const TextRenderedRun& aRun)
: nsCharClipDisplayItem(aRun.mFrame)
{
aRun.GetClipEdges(mLeftEdge, mRightEdge);
}
NS_DISPLAY_DECL_NAME("SVGText", TYPE_TEXT)
};
// -----------------------------------------------------------------------------
// 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 : public nsTextFrame::DrawPathCallbacks
{
public:
/**
* Constructs an SVGTextDrawPathCallbacks.
*
* @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 aShouldPaintSVGGlyphs Whether SVG glyphs should be painted.
*/
SVGTextDrawPathCallbacks(nsRenderingContext* aContext,
nsTextFrame* aFrame,
const gfxMatrix& aCanvasTM,
bool aShouldPaintSVGGlyphs)
: DrawPathCallbacks(aShouldPaintSVGGlyphs),
gfx(aContext->ThebesContext()),
mRenderMode(SVGAutoRenderState::GetRenderMode(aContext)),
mFrame(aFrame),
mCanvasTM(aCanvasTM)
{
}
void NotifyBeforeText(nscolor aColor);
void NotifyGlyphPathEmitted();
void NotifyBeforeSVGGlyphPainted();
void NotifyAfterSVGGlyphPainted();
void NotifyAfterText();
void NotifyBeforeSelectionBackground(nscolor aColor);
void NotifySelectionBackgroundPathEmitted();
void NotifyBeforeDecorationLine(nscolor aColor);
void NotifyDecorationLinePathEmitted();
void NotifyBeforeSelectionDecorationLine(nscolor aColor);
void NotifySelectionDecorationLinePathEmitted();
private:
void FillWithOpacity();
void SetupContext();
/**
* 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.
*/
bool SetFillColor();
/**
* Fills and strokes a piece of text geometry.
*/
void FillAndStroke();
gfxContext* gfx;
uint16_t mRenderMode;
nsTextFrame* mFrame;
const gfxMatrix& mCanvasTM;
/**
* 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;
};
void
SVGTextDrawPathCallbacks::NotifyBeforeText(nscolor aColor)
{
mColor = aColor;
SetupContext();
gfx->NewPath();
}
void
SVGTextDrawPathCallbacks::NotifyGlyphPathEmitted()
{
HandleTextGeometry();
gfx->NewPath();
}
void
SVGTextDrawPathCallbacks::NotifyBeforeSVGGlyphPainted()
{
gfx->Save();
}
void
SVGTextDrawPathCallbacks::NotifyAfterSVGGlyphPainted()
{
gfx->Restore();
gfx->NewPath();
}
void
SVGTextDrawPathCallbacks::NotifyAfterText()
{
gfx->Restore();
}
void
SVGTextDrawPathCallbacks::NotifyBeforeSelectionBackground(nscolor aColor)
{
if (mRenderMode != SVGAutoRenderState::NORMAL) {
// Don't paint selection backgrounds when in a clip path.
return;
}
mColor = aColor;
gfx->Save();
}
void
SVGTextDrawPathCallbacks::NotifySelectionBackgroundPathEmitted()
{
if (mRenderMode != SVGAutoRenderState::NORMAL) {
// Don't paint selection backgrounds when in a clip path.
return;
}
if (SetFillColor()) {
FillWithOpacity();
}
gfx->Restore();
}
void
SVGTextDrawPathCallbacks::NotifyBeforeDecorationLine(nscolor aColor)
{
mColor = aColor;
SetupContext();
}
void
SVGTextDrawPathCallbacks::NotifyDecorationLinePathEmitted()
{
HandleTextGeometry();
gfx->NewPath();
gfx->Restore();
}
void
SVGTextDrawPathCallbacks::NotifyBeforeSelectionDecorationLine(nscolor aColor)
{
if (mRenderMode != SVGAutoRenderState::NORMAL) {
// Don't paint selection decorations when in a clip path.
return;
}
mColor = aColor;
gfx->Save();
}
void
SVGTextDrawPathCallbacks::NotifySelectionDecorationLinePathEmitted()
{
if (mRenderMode != SVGAutoRenderState::NORMAL) {
// Don't paint selection decorations when in a clip path.
return;
}
FillAndStroke();
gfx->Restore();
}
void
SVGTextDrawPathCallbacks::FillWithOpacity()
{
gfx->FillWithOpacity(mColor == NS_40PERCENT_FOREGROUND_COLOR ? 0.4 : 1.0);
}
void
SVGTextDrawPathCallbacks::SetupContext()
{
gfx->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.
switch (mFrame->StyleSVG()->mTextRendering) {
case NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED:
gfx->SetAntialiasMode(gfxContext::MODE_ALIASED);
break;
default:
gfx->SetAntialiasMode(gfxContext::MODE_COVERAGE);
break;
}
}
void
SVGTextDrawPathCallbacks::HandleTextGeometry()
{
if (mRenderMode != SVGAutoRenderState::NORMAL) {
// We're in a clip path.
if (mFrame->StyleSVG()->mClipRule == NS_STYLE_FILL_RULE_EVENODD)
gfx->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
else
gfx->SetFillRule(gfxContext::FILL_RULE_WINDING);
if (mRenderMode == SVGAutoRenderState::CLIP_MASK) {
gfx->SetColor(gfxRGBA(1.0f, 1.0f, 1.0f, 1.0f));
gfx->Fill();
}
} else {
// Normal painting.
gfxContextMatrixAutoSaveRestore saveMatrix(gfx);
gfx->SetMatrix(mCanvasTM);
FillAndStroke();
}
}
bool
SVGTextDrawPathCallbacks::SetFillColor()
{
if (mColor == NS_SAME_AS_FOREGROUND_COLOR ||
mColor == NS_40PERCENT_FOREGROUND_COLOR) {
return nsSVGUtils::SetupCairoFillPaint(mFrame, gfx);
}
if (mColor == NS_TRANSPARENT) {
return false;
}
gfx->SetColor(gfxRGBA(mColor));
return true;
}
void
SVGTextDrawPathCallbacks::FillAndStroke()
{
bool pushedGroup = false;
if (mColor == NS_40PERCENT_FOREGROUND_COLOR) {
pushedGroup = true;
gfx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
}
if (SetFillColor()) {
gfx->Fill();
}
if (mColor == NS_SAME_AS_FOREGROUND_COLOR ||
mColor == NS_40PERCENT_FOREGROUND_COLOR) {
// Don't paint the stroke when we are filling with a selection color.
if (nsSVGUtils::SetupCairoStroke(mFrame, gfx)) {
gfx->Stroke();
}
}
if (pushedGroup) {
gfx->PopGroupToSource();
gfx->Paint(0.4);
}
}
// -----------------------------------------------------------------------------
// GlyphMetricsUpdater
NS_IMETHODIMP
GlyphMetricsUpdater::Run()
{
if (mFrame) {
mFrame->mPositioningDirty = true;
nsSVGUtils::InvalidateBounds(mFrame, false);
nsSVGUtils::ScheduleReflowSVG(mFrame);
mFrame->mGlyphMetricsUpdater = nullptr;
}
return NS_OK;
}
}
// ============================================================================
// nsSVGTextFrame2
// ----------------------------------------------------------------------------
// Display list item
class nsDisplaySVGText : public nsDisplayItem {
public:
nsDisplaySVGText(nsDisplayListBuilder* aBuilder,
nsSVGTextFrame2* aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplaySVGText);
NS_ABORT_IF_FALSE(aFrame, "Must have a frame!");
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplaySVGText() {
MOZ_COUNT_DTOR(nsDisplaySVGText);
}
#endif
NS_DISPLAY_DECL_NAME("nsDisplaySVGText", TYPE_SVG_TEXT)
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx);
};
void
nsDisplaySVGText::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
{
nsSVGTextFrame2 *frame = static_cast<nsSVGTextFrame2*>(mFrame);
nsPoint pointRelativeToReferenceFrame = aRect.Center();
// ToReferenceFrame() includes frame->GetPosition(), our user space position.
nsPoint userSpacePt = pointRelativeToReferenceFrame -
(ToReferenceFrame() - frame->GetPosition());
nsIFrame* target = frame->GetFrameForPoint(userSpacePt);
if (target) {
aOutFrames->AppendElement(target);
}
}
void
nsDisplaySVGText::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
// ToReferenceFrame includes our mRect offset, but painting takes
// account of that too. To avoid double counting, we subtract that
// here.
nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
aCtx->PushState();
aCtx->Translate(offset);
static_cast<nsSVGTextFrame2*>(mFrame)->PaintSVG(aCtx, nullptr);
aCtx->PopState();
}
// ---------------------------------------------------------------------
// nsQueryFrame methods
NS_QUERYFRAME_HEAD(nsSVGTextFrame2)
NS_QUERYFRAME_ENTRY(nsSVGTextFrame2)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGTextFrame2Base)
// ---------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGTextFrame2(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGTextFrame2(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGTextFrame2)
// ---------------------------------------------------------------------
// nsIFrame methods
NS_IMETHODIMP
nsSVGTextFrame2::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::text), "Content is not an SVG text");
nsresult rv = nsSVGTextFrame2Base::Init(aContent, aParent, aPrevInFlow);
AddStateBits((aParent->GetStateBits() &
(NS_STATE_SVG_NONDISPLAY_CHILD | NS_STATE_SVG_CLIPPATH_CHILD)) |
NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_SVG_TEXT);
mMutationObserver.StartObserving(this);
return rv;
}
void
nsSVGTextFrame2::DestroyFrom(nsIFrame* aDestructRoot)
{
if (mGlyphMetricsUpdater) {
mGlyphMetricsUpdater->Revoke();
}
nsSVGTextFrame2Base::DestroyFrom(aDestructRoot);
}
void
nsSVGTextFrame2::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (NS_SUBTREE_DIRTY(this)) {
// We can sometimes be asked to paint before reflow happens and we
// have updated mPositions, etc. In this case, we just avoid
// painting.
return;
}
aLists.Content()->AppendNewToTop(
new (aBuilder) nsDisplaySVGText(aBuilder, this));
}
NS_IMETHODIMP
nsSVGTextFrame2::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID != kNameSpaceID_None)
return NS_OK;
if (aAttribute == nsGkAtoms::transform) {
NotifySVGChanged(TRANSFORM_CHANGED);
} else if (IsGlyphPositioningAttribute(aAttribute)) {
NotifyGlyphMetricsChange();
}
return NS_OK;
}
nsIAtom *
nsSVGTextFrame2::GetType() const
{
return nsGkAtoms::svgTextFrame2;
}
NS_IMPL_ISUPPORTS1(nsSVGTextFrame2::MutationObserver, nsIMutationObserver)
void
nsSVGTextFrame2::MutationObserver::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
mFrame->NotifyGlyphMetricsChange();
}
void
nsSVGTextFrame2::MutationObserver::ContentInserted(
nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
mFrame->NotifyGlyphMetricsChange();
}
void
nsSVGTextFrame2::MutationObserver::ContentRemoved(
nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
mFrame->NotifyGlyphMetricsChange();
}
void
nsSVGTextFrame2::MutationObserver::AttributeChanged(
nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (!aElement->IsSVG()) {
return;
}
// Attribute changes on this element are handled in
// nsSVGTextFrame2::AttributeChanged.
if (aElement == mFrame->GetContent()) {
return;
}
// Attributes changes on descendent elements.
if (aElement->Tag() == nsGkAtoms::textPath) {
if (aNameSpaceID == kNameSpaceID_None &&
aAttribute == nsGkAtoms::startOffset) {
mFrame->NotifyGlyphMetricsChange();
} else if (aNameSpaceID == kNameSpaceID_XLink &&
aAttribute == nsGkAtoms::href) {
// Blow away our reference, if any
nsIFrame* childElementFrame = aElement->GetPrimaryFrame();
if (childElementFrame) {
childElementFrame->Properties().Delete(nsSVGEffects::HrefProperty());
mFrame->NotifyGlyphMetricsChange();
}
}
} else {
if (aNameSpaceID == kNameSpaceID_None &&
IsGlyphPositioningAttribute(aAttribute)) {
mFrame->NotifyGlyphMetricsChange();
}
}
}
NS_IMETHODIMP
nsSVGTextFrame2::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
NS_ABORT_IF_FALSE(!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
"Should not have been called");
// Only InvalidateAndScheduleReflowSVG marks us with NS_FRAME_IS_DIRTY,
// so if that bit is still set we still have a resize pending. If we hit
// this assertion, then we should get the presShell to skip reflow roots
// that have a dirty parent since a reflow is going to come via the
// reflow root's parent anyway.
NS_ASSERTION(!(GetStateBits() & NS_FRAME_IS_DIRTY),
"Reflowing while a resize is pending is wasteful");
// ReflowSVG makes sure mRect is up to date before we're called.
NS_ASSERTION(!aReflowState.parentReflowState,
"should only get reflow from being reflow root");
NS_ASSERTION(aReflowState.ComputedWidth() == GetSize().width &&
aReflowState.ComputedHeight() == GetSize().height,
"reflow roots should be reflowed at existing size and "
"svg.css should ensure we have no padding/border/margin");
DoReflow(false);
aDesiredSize.width = aReflowState.ComputedWidth();
aDesiredSize.height = aReflowState.ComputedHeight();
aDesiredSize.SetOverflowAreasToDesiredBounds();
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
void
nsSVGTextFrame2::FindCloserFrameForSelection(
nsPoint aPoint,
nsIFrame::FrameWithDistance* aCurrentBestFrame)
{
UpdateGlyphPositioning(false);
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;
gfxRect userRect = run.GetUserSpaceRect(presContext, flags);
nsRect rect = nsSVGUtils::ToCanvasBounds(userRect,
GetCanvasTM(FOR_HIT_TESTING),
presContext);
if (nsLayoutUtils::PointIsCloserToRect(aPoint, rect,
aCurrentBestFrame->mXDistance,
aCurrentBestFrame->mYDistance)) {
aCurrentBestFrame->mFrame = run.mFrame;
}
}
}
//----------------------------------------------------------------------
// nsISVGChildFrame methods
void
nsSVGTextFrame2::NotifySVGChanged(uint32_t aFlags)
{
NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
"Invalidation logic may need adjusting");
bool needNewBounds = false;
bool needGlyphMetricsUpdate = false;
bool needNewCanvasTM = false;
if (aFlags & COORD_CONTEXT_CHANGED) {
needGlyphMetricsUpdate = true;
}
if (aFlags & TRANSFORM_CHANGED) {
needNewCanvasTM = true;
if (mCanvasTM && mCanvasTM->IsSingular()) {
// We won't have calculated the glyph positions correctly.
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.
nsSVGUtils::ScheduleReflowSVG(this);
}
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 (!(mState & NS_FRAME_FIRST_REFLOW)) {
NotifyGlyphMetricsChange();
}
}
if (needNewCanvasTM) {
// Do this after calling InvalidateAndScheduleReflowSVG in case we
// change the code and it needs to use it.
mCanvasTM = nullptr;
}
}
/**
* Gets the offset into a DOM node that the specified caret is positioned at.
*/
static int32_t
GetCaretOffset(nsCaret* aCaret)
{
nsCOMPtr<nsISelection> selection = aCaret->GetCaretDOMSelection();
if (!selection) {
return -1;
}
int32_t offset = -1;
selection->GetAnchorOffset(&offset);
return offset;
}
/**
* 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;
}
if (uint32_t(caretOffset) >= aThisRun.mTextFrameContentOffset &&
uint32_t(caretOffset) < aThisRun.mTextFrameContentOffset +
aThisRun.mTextFrameContentLength) {
return true;
}
return false;
}
NS_IMETHODIMP
nsSVGTextFrame2::PaintSVG(nsRenderingContext* aContext,
const nsIntRect *aDirtyRect)
{
nsIFrame* kid = GetFirstPrincipalChild();
if (!kid)
return NS_OK;
gfxContext *gfx = aContext->ThebesContext();
gfxMatrix initialMatrix = gfx->CurrentMatrix();
AutoCanvasTMForMarker autoCanvasTMFor(this, FOR_PAINTING);
if (mState & NS_STATE_SVG_NONDISPLAY_CHILD) {
// Text frames inside <clipPath>, <mask>, etc. will never have had
// ReflowSVG called on them, so call UpdateGlyphPositioning to do this now.
UpdateGlyphPositioning(true);
} else if (NS_SUBTREE_DIRTY(this)) {
// 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 NS_OK;
}
gfxMatrix canvasTM = GetCanvasTM(FOR_PAINTING);
if (canvasTM.IsSingular()) {
NS_WARNING("Can't render text element!");
return NS_ERROR_FAILURE;
}
gfxMatrix matrixForPaintServers(canvasTM);
matrixForPaintServers.Multiply(initialMatrix);
nsPresContext* presContext = PresContext();
// Check if we need to draw anything.
if (aDirtyRect) {
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
(mState & NS_STATE_SVG_NONDISPLAY_CHILD),
"Display lists handle dirty rect intersection test");
nsRect dirtyRect(aDirtyRect->x, aDirtyRect->y,
aDirtyRect->width, aDirtyRect->height);
gfxFloat appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
gfxRect frameRect(mRect.x / appUnitsPerDevPixel,
mRect.y / appUnitsPerDevPixel,
mRect.width / appUnitsPerDevPixel,
mRect.height / appUnitsPerDevPixel);
nsRect canvasRect = nsLayoutUtils::RoundGfxRectToAppRect(
GetCanvasTM(FOR_OUTERSVG_TM).TransformBounds(frameRect), 1);
if (!canvasRect.Intersects(dirtyRect)) {
return NS_OK;
}
}
// SVG paints in CSS px, but normally frames paint in dev pixels. Here we
// multiply a CSS-px-to-dev-pixel factor onto canvasTM so our children paint
// correctly.
float cssPxPerDevPx = presContext->
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
gfxMatrix canvasTMForChildren = canvasTM;
canvasTMForChildren.Scale(cssPxPerDevPx, cssPxPerDevPx);
initialMatrix.Scale(1 / cssPxPerDevPx, 1 / cssPxPerDevPx);
gfxContextAutoSaveRestore save(gfx);
gfx->NewPath();
gfx->Multiply(canvasTMForChildren);
gfxMatrix currentMatrix = gfx->CurrentMatrix();
nsRefPtr<nsCaret> caret = presContext->PresShell()->GetCaret();
nsIFrame* caretFrame = caret->GetCaretFrame();
TextRenderedRunIterator it(this, TextRenderedRunIterator::eVisibleFrames);
TextRenderedRun run = it.Current();
while (run.mFrame) {
nsTextFrame* frame = run.mFrame;
// Determine how much of the left and right edges of the text frame we
// need to ignore.
SVGCharClipDisplayItem item(run);
// Set up the fill and stroke so that SVG glyphs can get painted correctly
// when they use -moz-objectFill values etc.
gfx->SetMatrix(initialMatrix);
gfxTextObjectPaint *outerObjectPaint =
(gfxTextObjectPaint*)aContext->GetUserData(&gfxTextObjectPaint::sUserDataKey);
nsAutoPtr<gfxTextObjectPaint> objectPaint;
SetupCairoState(gfx, frame, outerObjectPaint, getter_Transfers(objectPaint));
// Set up the transform for painting the text frame for the substring
// indicated by the run.
gfxMatrix runTransform =
run.GetTransformFromUserSpaceForPainting(presContext, item);
runTransform.Multiply(currentMatrix);
gfx->SetMatrix(runTransform);
nsRect frameRect = frame->GetVisualOverflowRect();
bool paintSVGGlyphs;
if (ShouldRenderAsPath(aContext, frame, paintSVGGlyphs)) {
SVGTextDrawPathCallbacks callbacks(aContext, frame, matrixForPaintServers,
paintSVGGlyphs);
frame->PaintText(aContext, nsPoint(), frameRect, item,
objectPaint, &callbacks);
} else {
frame->PaintText(aContext, nsPoint(), frameRect, item,
objectPaint, nullptr);
}
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(nullptr, aContext, frame, nsPoint());
gfx->NewPath();
}
run = it.Next();
}
return NS_OK;
}
NS_IMETHODIMP_(nsIFrame*)
nsSVGTextFrame2::GetFrameForPoint(const nsPoint& aPoint)
{
NS_ASSERTION(GetFirstPrincipalChild(), "must have a child frame");
AutoCanvasTMForMarker autoCanvasTMFor(this, FOR_HIT_TESTING);
if (mState & NS_STATE_SVG_NONDISPLAY_CHILD) {
// 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(true);
} else {
NS_ASSERTION(!NS_SUBTREE_DIRTY(this), "reflow should have happened");
}
nsPresContext* presContext = PresContext();
gfxPoint pointInOuterSVGUserUnits = AppUnitsToGfxUnits(aPoint, presContext);
TextRenderedRunIterator it(this);
nsIFrame* hit = nullptr;
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
uint16_t hitTestFlags = nsSVGUtils::GetGeometryHitTestFlags(run.mFrame);
if (!(hitTestFlags & (SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE))) {
continue;
}
gfxMatrix m = GetCanvasTM(FOR_HIT_TESTING);
m.PreMultiply(run.GetTransformFromRunUserSpaceToUserSpace(presContext));
m.Invert();
gfxPoint pointInRunUserSpace = m.Transform(pointInOuterSVGUserUnits);
gfxRect frameRect =
run.GetRunUserSpaceRect(presContext, TextRenderedRun::eIncludeFill |
TextRenderedRun::eIncludeStroke);
if (Inside(frameRect, pointInRunUserSpace) &&
nsSVGUtils::HitTestClip(this, aPoint)) {
hit = run.mFrame;
}
}
return hit;
}
NS_IMETHODIMP_(nsRect)
nsSVGTextFrame2::GetCoveredRegion()
{
return nsSVGUtils::TransformFrameRectToOuterSVG(
mRect, GetCanvasTM(FOR_OUTERSVG_TM), PresContext());
}
void
nsSVGTextFrame2::ReflowSVG()
{
NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
"This call is probaby a wasteful mistake");
NS_ABORT_IF_FALSE(!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
"ReflowSVG mechanism not designed for this");
if (!nsSVGUtils::NeedsReflowSVG(this)) {
NS_ASSERTION(!mPositioningDirty, "How did this happen?");
return;
}
// UpdateGlyphPositioning may have been called under DOM calls and set
// mPositioningDirty to false. We may now have better positioning, though, so
// set it to true so that UpdateGlyphPositioning will do its work.
mPositioningDirty = true;
// UpdateGlyphPositioning will call DoReflow if necessary.
UpdateGlyphPositioning(false);
nsPresContext* presContext = PresContext();
gfxRect r;
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames);
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
uint32_t runFlags = 0;
uint16_t hitTestFlags = nsSVGUtils::GetGeometryHitTestFlags(run.mFrame);
if ((hitTestFlags & SVG_HIT_TEST_FILL) ||
run.mFrame->StyleSVG()->mFill.mType != eStyleSVGPaintType_None) {
runFlags |= TextRenderedRun::eIncludeFill;
}
if ((hitTestFlags & SVG_HIT_TEST_STROKE) ||
nsSVGUtils::HasStroke(run.mFrame)) {
runFlags |= TextRenderedRun::eIncludeStroke;
}
if (runFlags) {
r = r.Union(run.GetUserSpaceRect(presContext, runFlags));
}
}
mRect =
nsLayoutUtils::RoundGfxRectToAppRect(r, presContext->AppUnitsPerCSSPixel());
if (mState & NS_FRAME_FIRST_REFLOW) {
// Make sure we have our filter property (if any) before calling
// FinishAndStoreOverflow (subsequent filter changes are handled off
// nsChangeHint_UpdateEffects):
nsSVGEffects::UpdateEffects(this);
}
// We only invalidate if we are dirty, if our outer-<svg> has already had its
// initial reflow (since if it hasn't, its entire area will be invalidated
// when it gets that initial reflow), and if our parent is not dirty (since
// if it is, then it will invalidate its entire new area, which will include
// our new area).
bool invalidate = (mState & NS_FRAME_IS_DIRTY) &&
!(GetParent()->GetStateBits() &
(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY));
nsRect overflow = nsRect(nsPoint(0,0), mRect.Size());
nsOverflowAreas overflowAreas(overflow, overflow);
FinishAndStoreOverflow(overflowAreas, mRect.Size());
// Now unset the various reflow bits:
mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
// XXX nsSVGContainerFrame::ReflowSVG only looks at its nsISVGChildFrame
// children, and calls ConsiderChildOverflow on them. Does it matter
// that ConsiderChildOverflow won't be called on our children?
nsSVGTextFrame2Base::ReflowSVG();
if (invalidate) {
// XXXSDL Let FinishAndStoreOverflow do this.
nsSVGUtils::InvalidateBounds(this, true);
}
}
/**
* Converts nsSVGUtils::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 & nsSVGUtils::eBBoxIncludeFillGeometry) ||
((aBBoxFlags & nsSVGUtils::eBBoxIncludeFill) &&
aRun.mFrame->StyleSVG()->mFill.mType != eStyleSVGPaintType_None)) {
flags |= TextRenderedRun::eIncludeFill;
}
if ((aBBoxFlags & nsSVGUtils::eBBoxIncludeStrokeGeometry) ||
((aBBoxFlags & nsSVGUtils::eBBoxIncludeStroke) &&
nsSVGUtils::HasStroke(aRun.mFrame))) {
flags |= TextRenderedRun::eIncludeStroke;
}
return flags;
}
SVGBBox
nsSVGTextFrame2::GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
uint32_t aFlags)
{
NS_ASSERTION(GetFirstPrincipalChild(), "must have a child frame");
UpdateGlyphPositioning(true);
gfxRect bbox;
nsPresContext* presContext = PresContext();
TextRenderedRunIterator it(this);
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
uint32_t flags = TextRenderedRunFlagsForBBoxContribution(run, aFlags);
gfxRect bboxForRun =
run.GetUserSpaceRect(presContext, flags, &aToBBoxUserspace);
bbox = bbox.Union(bboxForRun);
}
return bbox;
}
//----------------------------------------------------------------------
// nsSVGContainerFrame methods
gfxMatrix
nsSVGTextFrame2::GetCanvasTM(uint32_t aFor)
{
if (!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD)) {
if ((aFor == FOR_PAINTING && NS_SVGDisplayListPaintingEnabled()) ||
(aFor == FOR_HIT_TESTING && NS_SVGDisplayListHitTestingEnabled())) {
return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(this);
}
}
if (!mCanvasTM) {
NS_ASSERTION(mParent, "null parent");
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
dom::SVGTextContentElement *content = static_cast<dom::SVGTextContentElement*>(mContent);
gfxMatrix tm = content->PrependLocalTransformsTo(parent->GetCanvasTM(aFor));
mCanvasTM = new gfxMatrix(tm);
}
return *mCanvasTM;
}
//----------------------------------------------------------------------
// nsSVGTextFrame2 SVG DOM methods
/**
* Returns whether the specified node has any non-empty nsTextNodes
* beneath it.
*/
static bool
HasTextContent(nsIContent* aContent)
{
NS_ASSERTION(aContent, "expected non-null aContent");
TextNodeIterator it(aContent);
for (nsTextNode* 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 (nsTextNode* text = it.Current(); text; text = it.Next()) {
length += text->TextLength();
}
return length;
}
int32_t
nsSVGTextFrame2::ConvertTextElementCharIndexToAddressableIndex(
int32_t aIndex,
nsIContent* aContent)
{
CharIterator it(this, CharIterator::eAddressable, aContent);
if (!it.AdvanceToSubtree()) {
return -1;
}
uint32_t result = 0;
while (!it.AtEnd() &&
it.IsWithinSubtree() &&
it.TextElementCharIndex() < static_cast<uint32_t>(aIndex)) {
result++;
it.Next();
}
return result;
}
/**
* Implements the SVG DOM GetNumberOfChars method for the specified
* text content element.
*/
uint32_t
nsSVGTextFrame2::GetNumberOfChars(nsIContent* aContent)
{
UpdateGlyphPositioning(false);
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
nsSVGTextFrame2::GetComputedTextLength(nsIContent* aContent)
{
UpdateGlyphPositioning(false);
float cssPxPerDevPx = PresContext()->
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 / mFontSizeScaleFactor;
}
/**
* Implements the SVG DOM GetSubStringLength method for the specified
* text content element.
*/
float
nsSVGTextFrame2::GetSubStringLength(nsIContent* aContent,
uint32_t charnum, uint32_t nchars)
{
UpdateGlyphPositioning(false);
// Convert charnum/nchars from addressable characters relative to
// aContent to global character indices.
CharIterator chit(this, CharIterator::eAddressable, aContent);
if (!chit.AdvanceToSubtree() ||
chit.AtEnd() ||
!chit.Next(charnum) ||
chit.IsAfterSubtree()) {
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 it(this, TextRenderedRunIterator::eAllFrames);
TextRenderedRun run = it.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);
ConvertOriginalToSkipped(it, offset, length);
// Accumulate the advance.
textLength += textRun->GetAdvanceWidth(offset, length, nullptr);
}
run = it.Next();
}
nsPresContext* presContext = PresContext();
float cssPxPerDevPx = presContext->
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
return presContext->AppUnitsToGfxUnits(textLength) *
cssPxPerDevPx / mFontSizeScaleFactor;
}
/**
* Implements the SVG DOM GetCharNumAtPosition method for the specified
* text content element.
*/
int32_t
nsSVGTextFrame2::GetCharNumAtPosition(nsIContent* aContent,
mozilla::nsISVGPoint* aPoint)
{
UpdateGlyphPositioning(false);
nsPresContext* context = PresContext();
gfxPoint p(aPoint->X(), aPoint->Y());
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 - run.mTextFrameContentOffset;
}
}
if (result == -1) {
return result;
}
return ConvertTextElementCharIndexToAddressableIndex(result, aContent);
}
/**
* Implements the SVG DOM GetStartPositionOfChar method for the specified
* text content element.
*/
nsresult
nsSVGTextFrame2::GetStartPositionOfChar(nsIContent* aContent,
uint32_t aCharNum,
mozilla::nsISVGPoint** aResult)
{
UpdateGlyphPositioning(false);
CharIterator it(this, CharIterator::eAddressable, aContent);
if (!it.AdvanceToSubtree() ||
it.AtEnd() ||
!it.Next(aCharNum)) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// We need to return the start position of the whole glyph.
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
NS_ADDREF(*aResult = new DOMSVGPoint(mPositions[startIndex].mPosition));
return NS_OK;
}
/**
* Implements the SVG DOM GetEndPositionOfChar method for the specified
* text content element.
*/
nsresult
nsSVGTextFrame2::GetEndPositionOfChar(nsIContent* aContent,
uint32_t aCharNum,
mozilla::nsISVGPoint** aResult)
{
UpdateGlyphPositioning(false);
CharIterator it(this, CharIterator::eAddressable, aContent);
if (!it.AdvanceToSubtree() ||
it.AtEnd() ||
!it.Next(aCharNum)) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// We need to return the end position of the whole glyph.
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
// Get the advance of the glyph.
gfxFloat advance = it.GetGlyphAdvance(PresContext());
if (it.TextRun()->IsRightToLeft()) {
advance = -advance;
}
// The end position is the start position plus the advance in the direction
// of the glyph's rotation.
gfxMatrix m;
m.Translate(mPositions[startIndex].mPosition);
m.Rotate(mPositions[startIndex].mAngle);
gfxPoint p = m.Transform(gfxPoint(advance / mFontSizeScaleFactor, 0));
NS_ADDREF(*aResult = new DOMSVGPoint(p));
return NS_OK;
}
/**
* Implements the SVG DOM GetExtentOfChar method for the specified
* text content element.
*/
nsresult
nsSVGTextFrame2::GetExtentOfChar(nsIContent* aContent,
uint32_t aCharNum,
nsIDOMSVGRect** aResult)
{
UpdateGlyphPositioning(false);
CharIterator it(this, CharIterator::eAddressable, aContent);
if (!it.AdvanceToSubtree() ||
it.AtEnd() ||
!it.Next(aCharNum)) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
nsPresContext* presContext = PresContext();
float cssPxPerDevPx = presContext->
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
// We need to return the extent of the whole glyph.
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
// The ascent and descent gives the height of the glyph.
gfxFloat ascent, descent;
GetAscentAndDescentInAppUnits(it.TextFrame(), ascent, descent);
// Get the advance of the glyph.
gfxFloat advance = it.GetGlyphAdvance(presContext);
gfxFloat x = it.TextRun()->IsRightToLeft() ? -advance : 0.0;
// The horizontal extent is the origin of the glyph plus the advance
// in the direction of the glyph's rotation.
gfxMatrix m;
m.Translate(mPositions[startIndex].mPosition);
m.Rotate(mPositions[startIndex].mAngle);
m.Scale(1 / mFontSizeScaleFactor, 1 / mFontSizeScaleFactor);
gfxRect glyphRect
(x, -presContext->AppUnitsToGfxUnits(ascent) * cssPxPerDevPx,
advance, presContext->AppUnitsToGfxUnits(ascent + descent) * cssPxPerDevPx);
// Transform the glyph's rect into user space.
gfxRect r = m.TransformBounds(glyphRect);
NS_ADDREF(*aResult = new nsSVGRect(r.x, r.y, r.width, r.height));
return NS_OK;
}
/**
* Implements the SVG DOM GetRotationOfChar method for the specified
* text content element.
*/
nsresult
nsSVGTextFrame2::GetRotationOfChar(nsIContent* aContent,
uint32_t aCharNum,
float* aResult)
{
UpdateGlyphPositioning(false);
CharIterator it(this, CharIterator::eAddressable, aContent);
if (!it.AdvanceToSubtree() ||
it.AtEnd() ||
!it.Next(aCharNum)) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
*aResult = mPositions[it.TextElementCharIndex()].mAngle * 180.0 / M_PI;
return NS_OK;
}
//----------------------------------------------------------------------
// nsSVGTextFrame2 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;
}
uint32_t
nsSVGTextFrame2::ResolvePositions(nsIContent* aContent,
uint32_t aIndex,
bool aInTextPath,
bool& aForceStartOfChunk,
nsTArray<gfxPoint>& aDeltas)
{
if (aContent->IsNodeOfType(nsINode::eTEXT)) {
// We found a text node.
uint32_t length = static_cast<nsTextNode*>(aContent)->TextLength();
if (length) {
if (aForceStartOfChunk) {
// Note this character as starting a new anchored chunk.
mPositions[aIndex].mStartOfChunk = true;
aForceStartOfChunk = false;
}
uint32_t end = aIndex + length;
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 aIndex;
}
// Skip past elements that aren't text content elements.
if (!IsTextContentElement(aContent)) {
return aIndex;
}
if (aContent->Tag() == nsGkAtoms::textPath) {
// <textPath> elements are as if they are specified with x="0" y="0", but
// only if they actually have some text content.
if (HasTextContent(aContent)) {
mPositions[aIndex].mPosition = gfxPoint();
}
} else if (aContent->Tag() != nsGkAtoms::a) {
// We have a text content element that can have x/y/dx/dy/rotate attributes.
nsSVGElement* element = static_cast<nsSVGElement*>(aContent);
// Get x, y, dx, dy.
SVGUserUnitList x, y, dx, dy;
element->GetAnimatedLengthListValues(&x, &y, &dx, &dy);
// Get rotate.
const SVGNumberList* rotate = nullptr;
SVGAnimatedNumberList* animatedRotate =
element->GetAnimatedNumberList(nsGkAtoms::rotate);
if (animatedRotate) {
rotate = &animatedRotate->GetAnimValue();
}
uint32_t count = GetTextContentLength(aContent);
// 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];
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];
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];
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];
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++;
}
}
}
// Recurse to children.
bool inTextPath = aInTextPath || aContent->Tag() == nsGkAtoms::textPath;
for (nsIContent* child = aContent->GetFirstChild();
child;
child = child->GetNextSibling()) {
aIndex = ResolvePositions(child, aIndex, inTextPath, aForceStartOfChunk,
aDeltas);
}
if (aContent->Tag() == nsGkAtoms::textPath) {
// Force a new anchored chunk just after a <textPath>.
aForceStartOfChunk = true;
}
return aIndex;
}
bool
nsSVGTextFrame2::ResolvePositions(nsTArray<gfxPoint>& aDeltas)
{
NS_ASSERTION(mPositions.IsEmpty(), "expected mPositions to be empty");
CharIterator it(this, CharIterator::eOriginal);
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 = it.TextElementCharIndex();
for (uint32_t i = 0; i < index; i++) {
mPositions.AppendElement(CharPosition::Unspecified(false));
}
while (it.Next()) {
while (++index < it.TextElementCharIndex()) {
mPositions.AppendElement(CharPosition::Unspecified(false));
}
mPositions.AppendElement(CharPosition::Unspecified(
it.IsOriginalCharUnaddressable()));
}
// Recurse over the content and fill in character positions as we go.
bool forceStartOfChunk = false;
return ResolvePositions(mContent, 0, false, forceStartOfChunk, aDeltas) != 0;
}
void
nsSVGTextFrame2::DetermineCharPositions(nsTArray<nsPoint>& aPositions)
{
NS_ASSERTION(aPositions.IsEmpty(), "expected aPositions to be empty");
nsPoint position, lastPosition;
float cssPxPerDevPx = PresContext()->
AppUnitsToFloatCSSPixels(PresContext()->AppUnitsPerDevPixel());
TextFrameIterator frit(this);
for (nsTextFrame* frame = frit.Current(); frame; frame = frit.Next()) {
gfxSkipCharsIterator it = frame->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = frame->GetTextRun(nsTextFrame::eInflated);
// Reset the position to the new frame's position.
position = frit.Position();
if (textRun->IsRightToLeft()) {
position.x += frame->GetRect().width;
}
position.y += GetBaselinePosition(frame, textRun, frit.DominantBaseline());
position = nsPoint(nscoord(position.x * cssPxPerDevPx),
nscoord(position.y * cssPxPerDevPx));
// 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->GetContent()->GetText(), true);
while (it.GetOriginalOffset() < trimmedOffsets.mStart) {
aPositions.AppendElement(position);
it.AdvanceOriginal(1);
}
// If a ligature was started in the previous frame, we should record
// the ligature's start position, not any partial position.
while (it.GetOriginalOffset() < frame->GetContentEnd() &&
!it.IsOriginalCharSkipped() &&
(!textRun->IsLigatureGroupStart(it.GetSkippedOffset()) ||
!textRun->IsClusterStart(it.GetSkippedOffset()))) {
gfxFloat advance =
textRun->GetAdvanceWidth(it.GetSkippedOffset(), 1,
nullptr) * cssPxPerDevPx;
position.x += textRun->IsRightToLeft() ? -advance : advance;
aPositions.AppendElement(lastPosition);
it.AdvanceOriginal(1);
}
// The meat of the text frame.
while (it.GetOriginalOffset() < frame->GetContentEnd()) {
aPositions.AppendElement(position);
if (!it.IsOriginalCharSkipped() &&
textRun->IsLigatureGroupStart(it.GetSkippedOffset()) &&
textRun->IsClusterStart(it.GetSkippedOffset())) {
// A real visible character.
uint32_t length = ClusterLength(textRun, it);
gfxFloat advance =
textRun->GetAdvanceWidth(it.GetSkippedOffset(), length,
nullptr) * cssPxPerDevPx;
position.x += textRun->IsRightToLeft() ? -advance : advance;
lastPosition = position;
}
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(uint8_t aTextAnchor, bool aIsRightToLeft)
{
NS_ASSERTION(aTextAnchor <= 3, "unexpected value for aTextAnchor");
if (!aIsRightToLeft)
return TextAnchorSide(aTextAnchor);
return TextAnchorSide(2 - 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 aLeftEdge The left-most edge of any of the glyphs within the
* anchored chunk.
* @param aRightEdge The right-most edge of any of the glyphs within the
* anchored chunk.
* @param aAnchorSide The direction to anchor.
*/
static void
ShiftAnchoredChunk(nsTArray<mozilla::CharPosition>& aCharPositions,
uint32_t aChunkStart,
uint32_t aChunkEnd,
gfxFloat aLeftEdge,
gfxFloat aRightEdge,
TextAnchorSide aAnchorSide)
{
NS_ASSERTION(aLeftEdge <= aRightEdge, "unexpected anchored chunk edges");
NS_ASSERTION(aChunkStart < aChunkEnd, "unexpected values for aChunkStart and "
"aChunkEnd");
gfxFloat shift = aCharPositions[aChunkStart].mPosition.x;
switch (aAnchorSide) {
case eAnchorLeft:
shift -= aLeftEdge;
break;
case eAnchorMiddle:
shift -= (aLeftEdge + aRightEdge) / 2;
break;
case eAnchorRight:
shift -= aRightEdge;
break;
default:
NS_NOTREACHED("unexpected value for aAnchorSide");
}
if (shift != 0.0) {
for (uint32_t i = aChunkStart; i < aChunkEnd; i++) {
aCharPositions[i].mPosition.x += shift;
}
}
}
void
nsSVGTextFrame2::AdjustChunksForLineBreaks()
{
nsBlockFrame* block = nsLayoutUtils::GetAsBlock(GetFirstPrincipalChild());
NS_ASSERTION(block, "expected block frame");
nsBlockFrame::line_iterator line = block->begin_lines();
CharIterator it(this, CharIterator::eOriginal);
while (!it.AtEnd() && line != block->end_lines()) {
if (it.TextFrame() == line->mFirstChild) {
mPositions[it.TextElementCharIndex()].mStartOfChunk = true;
line++;
}
it.AdvancePastCurrentFrame();
}
}
void
nsSVGTextFrame2::AdjustPositionsForClusters()
{
nsPresContext* presContext = PresContext();
CharIterator it(this, CharIterator::eClusterOrLigatureGroupMiddle);
while (!it.AtEnd()) {
// Find the start of the cluster/ligature group.
uint32_t charIndex = it.TextElementCharIndex();
uint32_t startIndex = it.GlyphStartTextElementCharIndex();
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;
}
// Find out the partial glyph advance for this character and update
// the character position.
gfxFloat advance =
it.GetGlyphPartialAdvance(0, charIndex - startIndex, presContext) /
mFontSizeScaleFactor;
gfxPoint direction = gfxPoint(cos(angle), sin(angle)) *
(it.TextRun()->IsRightToLeft() ? -1.0 : 1.0);
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;
}
}
it.Next();
}
}
nsIFrame*
nsSVGTextFrame2::GetTextPathPathFrame(nsIFrame* aTextPathFrame)
{
nsSVGTextPathProperty *property = static_cast<nsSVGTextPathProperty*>
(aTextPathFrame->Properties().Get(nsSVGEffects::HrefProperty()));
if (!property) {
nsIContent* content = aTextPathFrame->GetContent();
dom::SVGTextPathElement* tp = static_cast<dom::SVGTextPathElement*>(content);
nsAutoString href;
tp->mStringAttributes[dom::SVGTextPathElement::HREF].GetAnimValue(href, tp);
if (href.IsEmpty()) {
return nullptr; // no URL
}
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = content->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
content->GetCurrentDoc(), base);
property = nsSVGEffects::GetTextPathProperty(targetURI, aTextPathFrame,
nsSVGEffects::HrefProperty());
if (!property)
return nullptr;
}
return property->GetReferencedFrame(nsGkAtoms::svgPathGeometryFrame, nullptr);
}
already_AddRefed<gfxFlattenedPath>
nsSVGTextFrame2::GetFlattenedTextPath(nsIFrame* aTextPathFrame)
{
nsIFrame *path = GetTextPathPathFrame(aTextPathFrame);
if (path) {
nsSVGPathGeometryElement *element =
static_cast<nsSVGPathGeometryElement*>(path->GetContent());
return element->GetFlattenedPath(element->PrependLocalTransformsTo(gfxMatrix()));
}
return nullptr;
}
gfxFloat
nsSVGTextFrame2::GetOffsetScale(nsIFrame* aTextPathFrame)
{
nsIFrame *pathFrame = GetTextPathPathFrame(aTextPathFrame);
if (!pathFrame)
return 1.0;
return static_cast<dom::SVGPathElement*>(pathFrame->GetContent())->
GetPathLengthScale(dom::SVGPathElement::eForTextPath);
}
gfxFloat
nsSVGTextFrame2::GetStartOffset(nsIFrame* aTextPathFrame)
{
dom::SVGTextPathElement *tp =
static_cast<dom::SVGTextPathElement*>(aTextPathFrame->GetContent());
nsSVGLength2 *length =
&tp->mLengthAttributes[dom::SVGTextPathElement::STARTOFFSET];
if (length->IsPercentage()) {
nsRefPtr<gfxFlattenedPath> data = GetFlattenedTextPath(aTextPathFrame);
return data ?
length->GetAnimValInSpecifiedUnits() * data->GetLength() / 100.0 :
0.0;
}
return length->GetAnimValue(tp) * GetOffsetScale(aTextPathFrame);
}
void
nsSVGTextFrame2::DoTextPathLayout()
{
nsPresContext* context = PresContext();
CharIterator it(this, CharIterator::eClusterAndLigatureGroupStart);
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.
nsRefPtr<gfxFlattenedPath> data = GetFlattenedTextPath(textPathFrame);
if (!data) {
it.AdvancePastCurrentTextPathFrame();
continue;
}
nsIContent* textPath = textPathFrame->GetContent();
gfxFloat offset = GetStartOffset(textPathFrame);
gfxFloat pathLength = data->GetLength();
// Loop for each text frame in the text path.
do {
uint32_t i = it.TextElementCharIndex();
gfxFloat halfAdvance =
it.GetGlyphAdvance(context) / mFontSizeScaleFactor / 2.0;
gfxFloat sign = it.TextRun()->IsRightToLeft() ? -1.0 : 1.0;
gfxFloat midx = 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.
double angle;
gfxPoint pt =
data->FindPoint(gfxPoint(midx, mPositions[i].mPosition.y), &angle);
gfxPoint direction = gfxPoint(cos(angle), sin(angle)) * sign;
mPositions[i].mPosition = pt - direction * halfAdvance;
mPositions[i].mAngle += angle;
// Position any characters for a partial ligature.
for (uint32_t j = i + 1;
j < mPositions.Length() && mPositions[j].mClusterOrLigatureGroupMiddle;
j++) {
gfxPoint partialAdvance =
direction * it.GetGlyphPartialAdvance(0, j - i, context) /
mFontSizeScaleFactor;
mPositions[j].mPosition = mPositions[i].mPosition + partialAdvance;
mPositions[j].mAngle = mPositions[i].mAngle;
mPositions[j].mHidden = mPositions[i].mHidden;
}
it.Next();
} while (it.TextPathFrame() &&
it.TextPathFrame()->GetContent() == textPath);
}
}
void
nsSVGTextFrame2::DoAnchoring()
{
nsPresContext* presContext = PresContext();
CharIterator it(this, CharIterator::eOriginal);
// Don't need to worry about skipped or trimmed characters.
while (!it.AtEnd() &&
(it.IsOriginalCharSkipped() || it.IsOriginalCharTrimmed())) {
it.Next();
}
uint32_t start = it.TextElementCharIndex();
while (start < mPositions.Length()) {
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;
if (it.TextRun()->IsRightToLeft()) {
left = std::min(left, mPositions[index].mPosition.x - advance);
right = std::max(right, mPositions[index].mPosition.x);
} else {
left = std::min(left, mPositions[index].mPosition.x);
right = std::max(right, mPositions[index].mPosition.x + 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 == NS_STYLE_DIRECTION_RTL;
TextAnchorSide anchor =
ConvertLogicalTextAnchorToPhysical(chunkFrame->StyleSVG()->mTextAnchor,
isRTL);
ShiftAnchoredChunk(mPositions, start, end, left, right, anchor);
}
start = it.TextElementCharIndex();
}
}
void
nsSVGTextFrame2::DoGlyphPositioning()
{
mPositions.Clear();
mPositioningDirty = false;
// Determine the positions of each character in app units.
nsTArray<nsPoint> charPositions;
DetermineCharPositions(charPositions);
if (charPositions.IsEmpty()) {
// No characters, so nothing to do.
return;
}
nsPresContext* presContext = PresContext();
// Get the x, y, dx, dy, rotate values for the subtree.
nsTArray<gfxPoint> deltas;
if (!ResolvePositions(deltas)) {
// If ResolvePositions returned false, it means that there were some
// characters in the DOM but none of them are displayed. 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 character position at index 0.
if (!mPositions[0].IsXSpecified()) {
mPositions[0].mPosition.x = 0.0;
}
if (!mPositions[0].IsYSpecified()) {
mPositions[0].mPosition.y = 0.0;
}
if (!mPositions[0].IsAngleSpecified()) {
mPositions[0].mAngle = 0.0;
}
// 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];
}
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) / mFontSizeScaleFactor;
}
// 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) / mFontSizeScaleFactor;
}
// 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 = mPositions[i - 1].mAngle;
if (mPositions[i].mAngle != 0.0f) {
// Any non-zero rotation must begin a run boundary.
mPositions[i].mRunBoundary = true;
}
}
}
// Fill in any remaining character positions after the specified
// x/y/rotate positions.
//
// XXX This may not be needed since ResolvePositions now initializes
// mPositions with an (unspecified) value for each character.
for (uint32_t i = mPositions.Length(); i < charPositions.Length(); i++) {
nscoord dx = charPositions[i].x - charPositions[i - 1].x;
nscoord dy = charPositions[i].y - charPositions[i - 1].y;
gfxPoint pt(mPositions[i - 1].mPosition.x +
presContext->AppUnitsToGfxUnits(dx),
mPositions[i - 1].mPosition.y +
presContext->AppUnitsToGfxUnits(dy));
mPositions.AppendElement(CharPosition(pt / mFontSizeScaleFactor,
mPositions[i - 1].mAngle));
if (i < deltas.Length()) {
mPositions[i].mPosition += deltas[i];
}
}
AdjustChunksForLineBreaks();
AdjustPositionsForClusters();
DoAnchoring();
DoTextPathLayout();
}
bool
nsSVGTextFrame2::ShouldRenderAsPath(nsRenderingContext* aContext,
nsTextFrame* aFrame,
bool& aShouldPaintSVGGlyphs)
{
// Rendering to a clip path.
if (SVGAutoRenderState::GetRenderMode(aContext) != SVGAutoRenderState::NORMAL) {
aShouldPaintSVGGlyphs = false;
return true;
}
aShouldPaintSVGGlyphs = true;
const nsStyleSVG* style = aFrame->StyleSVG();
// Fill is a non-solid paint, has a non-default fill-rule or has
// non-1 opacity.
if (!(style->mFill.mType == eStyleSVGPaintType_None ||
(style->mFill.mType == eStyleSVGPaintType_Color &&
style->mFillRule == NS_STYLE_FILL_RULE_NONZERO &&
style->mFillOpacity == 1))) {
return true;
}
// Text has a stroke.
if (!(style->mStroke.mType == eStyleSVGPaintType_None ||
style->mStrokeOpacity == 0 ||
nsSVGUtils::CoordToFloat(PresContext(),
static_cast<nsSVGElement*>(mContent),
style->mStrokeWidth) == 0)) {
return true;
}
return false;
}
void
nsSVGTextFrame2::NotifyGlyphMetricsChange()
{
// We need to perform the operations in GlyphMetricsUpdater in a
// script runner since we can get called just after a DOM mutation,
// before frames have been reconstructed, and UpdateGlyphPositioning
// will be called with out-of-date frames. This occurs when the
// <text> element is being filtered, as the InvalidateBounds()
// call needs to call in to GetBBoxContribution() to determine the
// filtered region, and that needs to iterate over the text frames.
// We would flush frame construction, but that needs to be done
// inside a script runner.
//
// Much of the time, this will perform the GlyphMetricsUpdater
// operations immediately.
if (mGlyphMetricsUpdater) {
return;
}
mGlyphMetricsUpdater = new GlyphMetricsUpdater(this);
nsContentUtils::AddScriptRunner(mGlyphMetricsUpdater.get());
}
void
nsSVGTextFrame2::UpdateGlyphPositioning(bool aForceGlobalTransform)
{
nsIFrame* kid = GetFirstPrincipalChild();
if (!kid)
return;
bool needsReflow =
(mState & (NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN));
NS_ASSERTION(!(kid->GetStateBits() & NS_FRAME_IN_REFLOW),
"should not be in reflow when about to reflow again");
if (!needsReflow)
return;
if (mState & NS_FRAME_IS_DIRTY) {
// If we require a full reflow, ensure our kid is marked fully dirty.
kid->AddStateBits(NS_FRAME_IS_DIRTY);
}
if (needsReflow) {
nsPresContext::InterruptPreventer noInterrupts(PresContext());
DoReflow(aForceGlobalTransform);
}
DoGlyphPositioning();
}
void
nsSVGTextFrame2::DoReflow(bool aForceGlobalTransform)
{
mPositioningDirty = true;
nsPresContext *presContext = PresContext();
nsIFrame* kid = GetFirstPrincipalChild();
if (!kid)
return;
nsIPresShell* presShell = presContext->PresShell();
NS_ASSERTION(presShell, "null presShell");
nsRefPtr<nsRenderingContext> renderingContext =
presShell->GetReferenceRenderingContext();
if (!renderingContext)
return;
UpdateFontSizeScaleFactor(aForceGlobalTransform);
nscoord width = kid->GetPrefWidth(renderingContext);
nsHTMLReflowState reflowState(presContext, kid,
renderingContext,
nsSize(width, NS_UNCONSTRAINEDSIZE));
nsHTMLReflowMetrics desiredSize;
nsReflowStatus status;
NS_ASSERTION(reflowState.mComputedBorderPadding == nsMargin(0, 0, 0, 0) &&
reflowState.mComputedMargin == nsMargin(0, 0, 0, 0),
"style system should ensure that :-moz-svg-text "
"does not get styled");
kid->WillReflow(presContext);
kid->Reflow(presContext, desiredSize, reflowState, status);
kid->DidReflow(presContext, &reflowState, nsDidReflowStatus::FINISHED);
kid->SetSize(nsSize(desiredSize.width, desiredSize.height));
TextNodeCorrespondenceRecorder::RecordCorrespondence(this);
}
// 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
void
nsSVGTextFrame2::UpdateFontSizeScaleFactor(bool aForceGlobalTransform)
{
nsPresContext* presContext = PresContext();
bool geometricPrecision = false;
nscoord min = nscoord_MAX,
max = nscoord_MIN;
// 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->StyleSVG()->mTextRendering ==
NS_STYLE_TEXT_RENDERING_GEOMETRICPRECISION;
}
nscoord size = f->StyleFont()->mFont.size;
if (size) {
min = std::min(min, size);
max = std::max(max, size);
}
f = it.Next();
}
if (min == nscoord_MAX) {
// No text, so no need for scaling.
mFontSizeScaleFactor = 1.0;
return;
}
gfxMatrix m;
if (aForceGlobalTransform ||
!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD)) {
m = GetCanvasTM(mGetCanvasTMForFlag);
if (m.IsSingular()) {
mFontSizeScaleFactor = 1.0;
return;
}
}
float textZoom = presContext->TextZoom();
double minSize = presContext->AppUnitsToFloatCSSPixels(min) / textZoom;
if (geometricPrecision) {
// We want to ensure minSize is scaled to PRECISE_SIZE.
mFontSizeScaleFactor = PRECISE_SIZE / minSize;
return;
}
double maxSize = presContext->AppUnitsToFloatCSSPixels(max) / textZoom;
// The context scale is the ratio of the length of the transformed
// diagonal vector (1,1) to the length of the untransformed diagonal
// (which is sqrt(2)).
gfxPoint p = m.Transform(gfxPoint(1, 1)) - m.Transform(gfxPoint(0, 0));
double contextScale = SVGContentUtils::ComputeNormalizedHypotenuse(p.x, p.y);
double minTextRunSize = minSize * contextScale;
double maxTextRunSize = maxSize * 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;
return;
}
if (maxSize / minSize > 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, so we treat the minimum as more
// important and just scale so that minSize = CLAMP_MIN_SIZE.
mFontSizeScaleFactor = CLAMP_MIN_SIZE / minTextRunSize;
return;
}
if (minTextRunSize < CLAMP_MIN_SIZE) {
mFontSizeScaleFactor = CLAMP_MIN_SIZE / minTextRunSize;
return;
}
mFontSizeScaleFactor = CLAMP_MAX_SIZE / maxTextRunSize;
}
double
nsSVGTextFrame2::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.
*/
gfxPoint
nsSVGTextFrame2::TransformFramePointToTextChild(const gfxPoint& aPoint,
nsIFrame* aChildFrame)
{
NS_ASSERTION(aChildFrame &&
nsLayoutUtils::GetClosestFrameOfType
(aChildFrame->GetParent(), nsGkAtoms::svgTextFrame2) == this,
"aChildFrame must be a descendant of this frame");
UpdateGlyphPositioning(true);
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 = presContext->
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
float factor = presContext->AppUnitsPerCSSPixel();
gfxPoint framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
NSAppUnitsToFloatPixels(mRect.y, factor));
gfxPoint 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);
gfxPoint pointInRunUserSpace =
run.GetTransformFromRunUserSpaceToUserSpace(presContext).Invert().
Transform(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 = clamped(pointInRunUserSpace.x,
runRect.X(), runRect.XMost());
pointInRun.y = clamped(pointInRunUserSpace.y,
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.Scale(mFontSizeScaleFactor, mFontSizeScaleFactor);
return m.Transform(pointInRun) / cssPxPerDevPx;
}
/**
* For each rendered run for frames beneath aChildFrame, convert aRect
* into the run's frame user space and intersect it with the run's
* frame user space rectangle. For each of these intersections,
* then translate them up into aChildFrame's coordinate space
* and union them all together.
*/
gfxRect
nsSVGTextFrame2::TransformFrameRectToTextChild(const gfxRect& aRect,
nsIFrame* aChildFrame)
{
NS_ASSERTION(aChildFrame &&
nsLayoutUtils::GetClosestFrameOfType
(aChildFrame->GetParent(), nsGkAtoms::svgTextFrame2) == this,
"aChildFrame must be a descendant of this frame");
UpdateGlyphPositioning(true);
nsPresContext* presContext = PresContext();
// Add in the mRect offset to aRect, as that will have been taken into
// account when transforming the rect from the ancestor frame down
// to this one.
float cssPxPerDevPx = presContext->
AppUnitsToFloatCSSPixels(presContext->AppUnitsPerDevPixel());
float factor = presContext->AppUnitsPerCSSPixel();
gfxPoint framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
NSAppUnitsToFloatPixels(mRect.y, factor));
gfxRect incomingRectInUserSpace(aRect.x * cssPxPerDevPx + framePosition.x,
aRect.y * cssPxPerDevPx + framePosition.y,
aRect.width * cssPxPerDevPx,
aRect.height * cssPxPerDevPx);
// Find each rendered run for text frames beneath aChildFrame.
gfxRect result;
TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames,
aChildFrame);
for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
// Convert the incoming rect into frame user space.
gfxMatrix m;
m.PreMultiply(run.GetTransformFromRunUserSpaceToUserSpace(presContext).Invert());
m.PreMultiply(run.GetTransformFromRunUserSpaceToFrameUserSpace(presContext));
gfxRect incomingRectInFrameUserSpace =
m.TransformBounds(incomingRectInUserSpace);
// Intersect it with this run's rectangle.
uint32_t flags = TextRenderedRun::eIncludeFill |
TextRenderedRun::eIncludeStroke;
gfxRect runRectInFrameUserSpace = run.GetFrameUserSpaceRect(presContext, flags);
gfxRect runIntersectionInFrameUserSpace =
incomingRectInFrameUserSpace.Intersect(runRectInFrameUserSpace);
if (!runIntersectionInFrameUserSpace.IsEmpty()) {
// Take the font size scale into account.
runIntersectionInFrameUserSpace.x *= mFontSizeScaleFactor;
runIntersectionInFrameUserSpace.y *= mFontSizeScaleFactor;
runIntersectionInFrameUserSpace.width *= mFontSizeScaleFactor;
runIntersectionInFrameUserSpace.height *= mFontSizeScaleFactor;
// Convert it into the coordinate space of aChildFrame.
nsPoint offset = run.mFrame->GetOffsetTo(aChildFrame);
gfxRect runIntersection =
runIntersectionInFrameUserSpace +
gfxPoint(NSAppUnitsToFloatPixels(offset.x, factor),
NSAppUnitsToFloatPixels(offset.y, factor));
// Union it into the result.
result.UnionRect(result, runIntersection);
}
}
return result;
}
/**
* 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
nsSVGTextFrame2::TransformFrameRectFromTextChild(const nsRect& aRect,
nsIFrame* aChildFrame)
{
NS_ASSERTION(aChildFrame &&
nsLayoutUtils::GetClosestFrameOfType
(aChildFrame->GetParent(), nsGkAtoms::svgTextFrame2) == this,
"aChildFrame must be a descendant of this frame");
UpdateGlyphPositioning(true);
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;
rectInFrameUserSpace.IntersectRect
(rectInFrameUserSpace, run.GetFrameUserSpaceRect(presContext, flags));
if (!rectInFrameUserSpace.IsEmpty()) {
// Transform it up to user space of the <text>, also taking into
// account the font size scale.
gfxMatrix m = run.GetTransformFromRunUserSpaceToUserSpace(presContext);
m.Scale(mFontSizeScaleFactor, mFontSizeScaleFactor);
gfxRect rectInUserSpace = m.Transform(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 = presContext->AppUnitsPerCSSPixel();
gfxPoint framePosition(NSAppUnitsToFloatPixels(mRect.x, factor),
NSAppUnitsToFloatPixels(mRect.y, factor));
return result - framePosition;
}
gfxFont::DrawMode
nsSVGTextFrame2::SetupCairoState(gfxContext* aContext,
nsIFrame* aFrame,
gfxTextObjectPaint* aOuterObjectPaint,
gfxTextObjectPaint** aThisObjectPaint)
{
gfxFont::DrawMode toDraw = gfxFont::DrawMode(0);
SVGTextObjectPaint *thisObjectPaint = new SVGTextObjectPaint();
if (SetupCairoStroke(aContext, aFrame, aOuterObjectPaint, thisObjectPaint)) {
toDraw = gfxFont::DrawMode(toDraw | gfxFont::GLYPH_STROKE);
}
if (SetupCairoFill(aContext, aFrame, aOuterObjectPaint, thisObjectPaint)) {
toDraw = gfxFont::DrawMode(toDraw | gfxFont::GLYPH_FILL);
}
*aThisObjectPaint = thisObjectPaint;
return toDraw;
}
bool
nsSVGTextFrame2::SetupCairoStroke(gfxContext* aContext,
nsIFrame* aFrame,
gfxTextObjectPaint* aOuterObjectPaint,
SVGTextObjectPaint* aThisObjectPaint)
{
const nsStyleSVG *style = aFrame->StyleSVG();
if (style->mStroke.mType == eStyleSVGPaintType_None) {
aThisObjectPaint->SetStrokeOpacity(0.0f);
return false;
}
gfxContextMatrixAutoSaveRestore matrixRestore(aContext);
aContext->IdentityMatrix();
nsSVGUtils::SetupCairoStrokeHitGeometry(aFrame, aContext, aOuterObjectPaint);
float opacity = nsSVGUtils::GetOpacity(style->mStrokeOpacitySource,
style->mStrokeOpacity,
aOuterObjectPaint);
SetupInheritablePaint(aContext, aFrame, opacity, aOuterObjectPaint,
aThisObjectPaint->mStrokePaint, &nsStyleSVG::mStroke,
nsSVGEffects::StrokeProperty());
aThisObjectPaint->SetStrokeOpacity(opacity);
return opacity != 0.0f;
}
bool
nsSVGTextFrame2::SetupCairoFill(gfxContext* aContext,
nsIFrame* aFrame,
gfxTextObjectPaint* aOuterObjectPaint,
SVGTextObjectPaint* aThisObjectPaint)
{
const nsStyleSVG *style = aFrame->StyleSVG();
if (style->mFill.mType == eStyleSVGPaintType_None) {
aThisObjectPaint->SetFillOpacity(0.0f);
return false;
}
float opacity = nsSVGUtils::GetOpacity(style->mFillOpacitySource,
style->mFillOpacity,
aOuterObjectPaint);
SetupInheritablePaint(aContext, aFrame, opacity, aOuterObjectPaint,
aThisObjectPaint->mFillPaint, &nsStyleSVG::mFill,
nsSVGEffects::FillProperty());
aThisObjectPaint->SetFillOpacity(opacity);
return true;
}
void
nsSVGTextFrame2::SetupInheritablePaint(gfxContext* aContext,
nsIFrame* aFrame,
float& aOpacity,
gfxTextObjectPaint* aOuterObjectPaint,
SVGTextObjectPaint::Paint& aTargetPaint,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
const FramePropertyDescriptor* aProperty)
{
const nsStyleSVG *style = aFrame->StyleSVG();
nsSVGPaintServerFrame *ps =
nsSVGEffects::GetPaintServer(aFrame, &(style->*aFillOrStroke), aProperty);
if (ps && ps->SetupPaintServer(aContext, aFrame, aFillOrStroke, aOpacity)) {
aTargetPaint.SetPaintServer(aFrame, aContext->CurrentMatrix(), ps);
} else if (SetupObjectPaint(aContext, aFrame, aFillOrStroke, aOpacity, aOuterObjectPaint)) {
aTargetPaint.SetObjectPaint(aOuterObjectPaint, (style->*aFillOrStroke).mType);
} else {
nscolor color = nsSVGUtils::GetFallbackOrPaintColor(aContext,
aFrame->StyleContext(),
aFillOrStroke);
aTargetPaint.SetColor(color);
aContext->SetPattern(new gfxPattern(gfxRGBA(NS_GET_R(color) / 255.0,
NS_GET_G(color) / 255.0,
NS_GET_B(color) / 255.0,
NS_GET_A(color) / 255.0 * aOpacity)));
}
}
bool
nsSVGTextFrame2::SetupObjectPaint(gfxContext* aContext,
nsIFrame* aFrame,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
float& aOpacity,
gfxTextObjectPaint* aOuterObjectPaint)
{
if (!aOuterObjectPaint) {
return false;
}
const nsStyleSVG *style = aFrame->StyleSVG();
const nsStyleSVGPaint &paint = style->*aFillOrStroke;
if (paint.mType != eStyleSVGPaintType_ObjectFill &&
paint.mType != eStyleSVGPaintType_ObjectStroke) {
return false;
}
gfxMatrix current = aContext->CurrentMatrix();
nsRefPtr<gfxPattern> pattern =
paint.mType == eStyleSVGPaintType_ObjectFill ?
aOuterObjectPaint->GetFillPattern(aOpacity, current) :
aOuterObjectPaint->GetStrokePattern(aOpacity, current);
if (!pattern) {
return false;
}
aContext->SetPattern(pattern);
return true;
}