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Bug 902799 - Support textruns with vertical writing modes when drawing Canvas2D text. r=bas

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This commit is contained in:
Jonathan Kew 2014-10-06 16:19:36 +01:00
parent d5c30211e1
commit 9e6b1ce2ef
2 changed files with 94 additions and 26 deletions
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116
dom/canvas/CanvasRenderingContext2D.cpp
View File

@ -3092,11 +3092,18 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
virtual void SetText(const char16_t* text, int32_t length, nsBidiDirection direction)
{
mFontgrp->UpdateUserFonts(); // ensure user font generation is current
// adjust flags for current direction run
uint32_t flags = mTextRunFlags;
if (direction & 1) {
flags |= gfxTextRunFactory::TEXT_IS_RTL;
} else {
flags &= ~gfxTextRunFactory::TEXT_IS_RTL;
}
mTextRun = mFontgrp->MakeTextRun(text,
length,
mThebes,
mAppUnitsPerDevPixel,
direction==NSBIDI_RTL ? gfxTextRunFactory::TEXT_IS_RTL : 0);
flags);
}
virtual nscoord GetWidth()
@ -3122,10 +3129,14 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
virtual void DrawText(nscoord xOffset, nscoord width)
{
gfxPoint point = mPt;
point.x += xOffset;
bool rtl = mTextRun->IsRightToLeft();
bool verticalRun = mTextRun->IsVertical();
gfxFloat& inlineCoord = verticalRun ? point.y : point.x;
inlineCoord += xOffset;
// offset is given in terms of left side of string
if (mTextRun->IsRightToLeft()) {
if (rtl) {
// Bug 581092 - don't use rounded pixel width to advance to
// right-hand end of run, because this will cause different
// glyph positioning for LTR vs RTL drawing of the same
@ -3139,7 +3150,7 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
gfxFont::LOOSE_INK_EXTENTS,
mThebes,
nullptr);
point.x += textRunMetrics.mAdvanceWidth;
inlineCoord += textRunMetrics.mAdvanceWidth;
// old code was:
// point.x += width * mAppUnitsPerDevPixel;
// TODO: restore this if/when we move to fractional coords
@ -3158,6 +3169,15 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
mCtx->EnsureTarget();
for (uint32_t c = 0; c < numRuns; c++) {
gfxFont *font = runs[c].mFont;
bool verticalFont =
runs[c].mOrientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT;
const float& baselineOriginInline =
verticalFont ? baselineOrigin.y : baselineOrigin.x;
const float& baselineOriginBlock =
verticalFont ? baselineOrigin.x : baselineOrigin.y;
uint32_t endRun = 0;
if (c + 1 < numRuns) {
endRun = runs[c + 1].mCharacterOffset;
@ -3175,23 +3195,53 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
return;
}
AutoRestoreTransform sidewaysRestore;
if (runs[c].mOrientation ==
gfxTextRunFactory::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT) {
sidewaysRestore.Init(mCtx->mTarget);
// TODO: The baseline adjustment here is kinda ad-hoc; eventually
// perhaps we should check for horizontal and vertical baseline data
// in the font, and adjust accordingly.
// (The same will be true for HTML text layout.)
const gfxFont::Metrics& metrics = mTextRun->GetFontGroup()->
GetFirstValidFont()->GetMetrics(gfxFont::eHorizontal);
mCtx->mTarget->SetTransform(mCtx->mTarget->GetTransform().Copy().
PreTranslate(baselineOrigin). // translate origin for rotation
PreRotate(gfx::Float(M_PI / 2.0)). // turn 90deg clockwise
PreTranslate(-baselineOrigin). // undo the translation
PreTranslate(Point(0, metrics.emAscent - metrics.emDescent) / 2));
// and offset the (alphabetic) baseline of the
// horizontally-shaped text from the (centered)
// default baseline used for vertical
}
RefPtr<GlyphRenderingOptions> renderingOptions = font->GetGlyphRenderingOptions();
GlyphBuffer buffer;
std::vector<Glyph> glyphBuf;
// TODO:
// This more-or-less duplicates the code found in gfxTextRun::Draw
// and the gfxFont methods that uses (Draw, DrawGlyphs, DrawOneGlyph);
// it would be nice to refactor and share that code.
for (uint32_t i = runs[c].mCharacterOffset; i < endRun; i++) {
Glyph newGlyph;
float& inlinePos =
verticalFont ? newGlyph.mPosition.y : newGlyph.mPosition.x;
float& blockPos =
verticalFont ? newGlyph.mPosition.x : newGlyph.mPosition.y;
if (glyphs[i].IsSimpleGlyph()) {
newGlyph.mIndex = glyphs[i].GetSimpleGlyph();
if (mTextRun->IsRightToLeft()) {
newGlyph.mPosition.x = baselineOrigin.x - advanceSum -
if (rtl) {
inlinePos = baselineOriginInline - advanceSum -
glyphs[i].GetSimpleAdvance() * devUnitsPerAppUnit;
} else {
newGlyph.mPosition.x = baselineOrigin.x + advanceSum;
inlinePos = baselineOriginInline + advanceSum;
}
newGlyph.mPosition.y = baselineOrigin.y;
blockPos = baselineOriginBlock;
advanceSum += glyphs[i].GetSimpleAdvance() * devUnitsPerAppUnit;
glyphBuf.push_back(newGlyph);
continue;
@ -3201,34 +3251,34 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
continue;
}
gfxTextRun::DetailedGlyph *detailedGlyphs =
mTextRun->GetDetailedGlyphs(i);
const gfxTextRun::DetailedGlyph *d = mTextRun->GetDetailedGlyphs(i);
if (glyphs[i].IsMissing()) {
newGlyph.mIndex = 0;
if (mTextRun->IsRightToLeft()) {
newGlyph.mPosition.x = baselineOrigin.x - advanceSum -
detailedGlyphs[0].mAdvance * devUnitsPerAppUnit;
if (rtl) {
inlinePos = baselineOriginInline - advanceSum -
d->mAdvance * devUnitsPerAppUnit;
} else {
newGlyph.mPosition.x = baselineOrigin.x + advanceSum;
inlinePos = baselineOriginInline + advanceSum;
}
newGlyph.mPosition.y = baselineOrigin.y;
advanceSum += detailedGlyphs[0].mAdvance * devUnitsPerAppUnit;
blockPos = baselineOriginBlock;
advanceSum += d->mAdvance * devUnitsPerAppUnit;
glyphBuf.push_back(newGlyph);
continue;
}
for (uint32_t c = 0; c < glyphs[i].GetGlyphCount(); c++) {
newGlyph.mIndex = detailedGlyphs[c].mGlyphID;
if (mTextRun->IsRightToLeft()) {
newGlyph.mPosition.x = baselineOrigin.x + detailedGlyphs[c].mXOffset * devUnitsPerAppUnit -
advanceSum - detailedGlyphs[c].mAdvance * devUnitsPerAppUnit;
for (uint32_t c = 0; c < glyphs[i].GetGlyphCount(); c++, d++) {
newGlyph.mIndex = d->mGlyphID;
if (rtl) {
inlinePos = baselineOriginInline - advanceSum -
d->mAdvance * devUnitsPerAppUnit;
} else {
newGlyph.mPosition.x = baselineOrigin.x + detailedGlyphs[c].mXOffset * devUnitsPerAppUnit + advanceSum;
inlinePos = baselineOriginInline + advanceSum;
}
newGlyph.mPosition.y = baselineOrigin.y + detailedGlyphs[c].mYOffset * devUnitsPerAppUnit;
inlinePos += d->mXOffset * devUnitsPerAppUnit;
blockPos = baselineOriginBlock + d->mYOffset * devUnitsPerAppUnit;
glyphBuf.push_back(newGlyph);
advanceSum += detailedGlyphs[c].mAdvance * devUnitsPerAppUnit;
advanceSum += d->mAdvance * devUnitsPerAppUnit;
}
}
@ -3303,6 +3353,9 @@ struct MOZ_STACK_CLASS CanvasBidiProcessor : public nsBidiPresUtils::BidiProcess
// union of bounding boxes of all runs, needed for shadows
gfxRect mBoundingBox;
// flags to use when creating textrun, based on CSS style
uint32_t mTextRunFlags;
// true iff the bounding box should be measured
bool mDoMeasureBoundingBox;
};
@ -3342,9 +3395,10 @@ CanvasRenderingContext2D::DrawOrMeasureText(const nsAString& aRawText,
// for now, default to ltr if not in doc
bool isRTL = false;
nsRefPtr<nsStyleContext> canvasStyle;
if (mCanvasElement && mCanvasElement->IsInDoc()) {
// try to find the closest context
nsRefPtr<nsStyleContext> canvasStyle =
canvasStyle =
nsComputedDOMStyle::GetStyleContextForElement(mCanvasElement,
nullptr,
presShell);
@ -3379,6 +3433,14 @@ CanvasRenderingContext2D::DrawOrMeasureText(const nsAString& aRawText,
CanvasBidiProcessor processor;
// If we don't have a style context, we can't set up vertical-text flags
// (for now, at least; perhaps we need new Canvas API to control this).
processor.mTextRunFlags = canvasStyle ?
nsLayoutUtils::GetTextRunFlagsForStyle(canvasStyle,
canvasStyle->StyleFont(),
canvasStyle->StyleText(),
0) : 0;
GetAppUnitsValues(&processor.mAppUnitsPerDevPixel, nullptr);
processor.mPt = gfxPoint(aX, aY);
processor.mThebes =
@ -3445,7 +3507,9 @@ CanvasRenderingContext2D::DrawOrMeasureText(const nsAString& aRawText,
// offset pt.y based on text baseline
processor.mFontgrp->UpdateUserFonts(); // ensure user font generation is current
const gfxFont::Metrics& fontMetrics =
processor.mFontgrp->GetFirstValidFont()->GetMetrics(gfxFont::eHorizontal); // XXX vertical?
processor.mFontgrp->GetFirstValidFont()->GetMetrics(
processor.mTextRun->IsVertical() ? gfxFont::eVertical :
gfxFont::eHorizontal);
gfxFloat anchorY;

4
gfx/2d/Helpers.h
View File

@ -14,6 +14,10 @@ namespace gfx {
class AutoRestoreTransform
{
public:
AutoRestoreTransform()
{
}
explicit AutoRestoreTransform(DrawTarget *aTarget)
: mDrawTarget(aTarget),
mOldTransform(aTarget->GetTransform())