| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003, 2006, 2010, 2011 Apple Inc. All rights reserved. |
| * Copyright (c) 2007, 2008, 2010 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "platform/fonts/Font.h" |
| |
| #include "platform/LayoutTestSupport.h" |
| #include "platform/LayoutUnit.h" |
| #include "platform/RuntimeEnabledFeatures.h" |
| #include "platform/fonts/CharacterRange.h" |
| #include "platform/fonts/FontCache.h" |
| #include "platform/fonts/FontFallbackIterator.h" |
| #include "platform/fonts/FontFallbackList.h" |
| #include "platform/fonts/GlyphBuffer.h" |
| #include "platform/fonts/GlyphPageTreeNode.h" |
| #include "platform/fonts/SimpleFontData.h" |
| #include "platform/fonts/shaping/CachingWordShaper.h" |
| #include "platform/fonts/shaping/HarfBuzzFace.h" |
| #include "platform/fonts/shaping/HarfBuzzShaper.h" |
| #include "platform/fonts/shaping/SimpleShaper.h" |
| #include "platform/geometry/FloatRect.h" |
| #include "platform/text/BidiResolver.h" |
| #include "platform/text/Character.h" |
| #include "platform/text/TextRun.h" |
| #include "platform/text/TextRunIterator.h" |
| #include "platform/transforms/AffineTransform.h" |
| #include "third_party/skia/include/core/SkCanvas.h" |
| #include "third_party/skia/include/core/SkPaint.h" |
| #include "third_party/skia/include/core/SkTextBlob.h" |
| #include "wtf/StdLibExtras.h" |
| #include "wtf/text/CharacterNames.h" |
| #include "wtf/text/Unicode.h" |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace blink { |
| |
| Font::Font() |
| : m_canShapeWordByWord(0) |
| , m_shapeWordByWordComputed(0) |
| { |
| } |
| |
| Font::Font(const FontDescription& fd) |
| : m_fontDescription(fd) |
| , m_canShapeWordByWord(0) |
| , m_shapeWordByWordComputed(0) |
| { |
| } |
| |
| Font::Font(const Font& other) |
| : m_fontDescription(other.m_fontDescription) |
| , m_fontFallbackList(other.m_fontFallbackList) |
| // TODO(yosin): We should have a comment the reason why don't we copy |
| // |m_canShapeWordByWord| and |m_shapeWordByWordComputed| from |other|, |
| // since |operator=()| copies them from |other|. |
| , m_canShapeWordByWord(0) |
| , m_shapeWordByWordComputed(0) |
| { |
| } |
| |
| Font& Font::operator=(const Font& other) |
| { |
| m_fontDescription = other.m_fontDescription; |
| m_fontFallbackList = other.m_fontFallbackList; |
| m_canShapeWordByWord = other.m_canShapeWordByWord; |
| m_shapeWordByWordComputed = other.m_shapeWordByWordComputed; |
| return *this; |
| } |
| |
| bool Font::operator==(const Font& other) const |
| { |
| FontSelector* first = m_fontFallbackList ? m_fontFallbackList->getFontSelector() : 0; |
| FontSelector* second = other.m_fontFallbackList ? other.m_fontFallbackList->getFontSelector() : 0; |
| |
| return first == second |
| && m_fontDescription == other.m_fontDescription |
| && (m_fontFallbackList ? m_fontFallbackList->fontSelectorVersion() : 0) == (other.m_fontFallbackList ? other.m_fontFallbackList->fontSelectorVersion() : 0) |
| && (m_fontFallbackList ? m_fontFallbackList->generation() : 0) == (other.m_fontFallbackList ? other.m_fontFallbackList->generation() : 0); |
| } |
| |
| void Font::update(FontSelector* fontSelector) const |
| { |
| // FIXME: It is pretty crazy that we are willing to just poke into a RefPtr, but it ends up |
| // being reasonably safe (because inherited fonts in the render tree pick up the new |
| // style anyway. Other copies are transient, e.g., the state in the GraphicsContext, and |
| // won't stick around long enough to get you in trouble). Still, this is pretty disgusting, |
| // and could eventually be rectified by using RefPtrs for Fonts themselves. |
| if (!m_fontFallbackList) |
| m_fontFallbackList = FontFallbackList::create(); |
| m_fontFallbackList->invalidate(fontSelector); |
| } |
| |
| float Font::buildGlyphBuffer(const TextRunPaintInfo& runInfo, GlyphBuffer& glyphBuffer, |
| const GlyphData* emphasisData) const |
| { |
| if (codePath(runInfo) == ComplexPath) { |
| float width; |
| CachingWordShaper shaper(m_fontFallbackList->shapeCache(m_fontDescription)); |
| if (emphasisData) { |
| width = shaper.fillGlyphBufferForTextEmphasis(this, runInfo.run, |
| emphasisData, &glyphBuffer, runInfo.from, runInfo.to); |
| } else { |
| width = shaper.fillGlyphBuffer(this, runInfo.run, nullptr, |
| &glyphBuffer, runInfo.from, runInfo.to); |
| } |
| |
| return width; |
| } |
| |
| SimpleShaper shaper(this, runInfo.run, emphasisData, nullptr /* fallbackFonts */, nullptr); |
| shaper.advance(runInfo.from); |
| shaper.advance(runInfo.to, &glyphBuffer); |
| float width = shaper.runWidthSoFar(); |
| |
| if (runInfo.run.rtl()) { |
| // Glyphs are shaped & stored in RTL advance order - reverse them for LTR drawing. |
| shaper.advance(runInfo.run.length()); |
| glyphBuffer.reverseForSimpleRTL(width, shaper.runWidthSoFar()); |
| } |
| |
| return width; |
| } |
| |
| bool Font::drawText(SkCanvas* canvas, const TextRunPaintInfo& runInfo, |
| const FloatPoint& point, float deviceScaleFactor, const SkPaint& paint) const |
| { |
| // Don't draw anything while we are using custom fonts that are in the process of loading. |
| if (shouldSkipDrawing()) |
| return false; |
| |
| if (runInfo.cachedTextBlob && runInfo.cachedTextBlob->get()) { |
| // we have a pre-cached blob -- happy joy! |
| canvas->drawTextBlob(runInfo.cachedTextBlob->get(), point.x(), point.y(), paint); |
| return true; |
| } |
| |
| GlyphBuffer glyphBuffer; |
| buildGlyphBuffer(runInfo, glyphBuffer); |
| |
| drawGlyphBuffer(canvas, paint, runInfo, glyphBuffer, point, deviceScaleFactor); |
| return true; |
| } |
| |
| bool Font::drawBidiText(SkCanvas* canvas, const TextRunPaintInfo& runInfo, const FloatPoint& point, CustomFontNotReadyAction customFontNotReadyAction, float deviceScaleFactor, const SkPaint& paint) const |
| { |
| // Don't draw anything while we are using custom fonts that are in the process of loading, |
| // except if the 'force' argument is set to true (in which case it will use a fallback |
| // font). |
| if (shouldSkipDrawing() && customFontNotReadyAction == DoNotPaintIfFontNotReady) |
| return false; |
| |
| // sub-run painting is not supported for Bidi text. |
| const TextRun& run = runInfo.run; |
| ASSERT((runInfo.from == 0) && (runInfo.to == run.length())); |
| BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver; |
| bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride())); |
| bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0)); |
| |
| // FIXME: This ownership should be reversed. We should pass BidiRunList |
| // to BidiResolver in createBidiRunsForLine. |
| BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs(); |
| bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length())); |
| if (!bidiRuns.runCount()) |
| return true; |
| |
| FloatPoint currPoint = point; |
| BidiCharacterRun* bidiRun = bidiRuns.firstRun(); |
| while (bidiRun) { |
| TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start()); |
| bool isRTL = bidiRun->level() % 2; |
| subrun.setDirection(isRTL ? RTL : LTR); |
| subrun.setDirectionalOverride(bidiRun->dirOverride(false)); |
| |
| TextRunPaintInfo subrunInfo(subrun); |
| subrunInfo.bounds = runInfo.bounds; |
| |
| // TODO: investigate blob consolidation/caching (technically, |
| // all subruns could be part of the same blob). |
| GlyphBuffer glyphBuffer; |
| float runWidth = buildGlyphBuffer(subrunInfo, glyphBuffer); |
| drawGlyphBuffer(canvas, paint, subrunInfo, glyphBuffer, currPoint, deviceScaleFactor); |
| |
| bidiRun = bidiRun->next(); |
| currPoint.move(runWidth, 0); |
| } |
| |
| bidiRuns.deleteRuns(); |
| return true; |
| } |
| |
| void Font::drawEmphasisMarks(SkCanvas* canvas, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point, float deviceScaleFactor, const SkPaint& paint) const |
| { |
| if (shouldSkipDrawing()) |
| return; |
| |
| FontCachePurgePreventer purgePreventer; |
| |
| GlyphData emphasisGlyphData; |
| if (!getEmphasisMarkGlyphData(mark, emphasisGlyphData)) |
| return; |
| |
| ASSERT(emphasisGlyphData.fontData); |
| if (!emphasisGlyphData.fontData) |
| return; |
| |
| GlyphBuffer glyphBuffer; |
| buildGlyphBuffer(runInfo, glyphBuffer, &emphasisGlyphData); |
| |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| drawGlyphBuffer(canvas, paint, runInfo, glyphBuffer, point, deviceScaleFactor); |
| } |
| |
| float Font::width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, FloatRect* glyphBounds) const |
| { |
| FontCachePurgePreventer purgePreventer; |
| |
| if (codePath(TextRunPaintInfo(run)) == ComplexPath) |
| return floatWidthForComplexText(run, fallbackFonts, glyphBounds); |
| return floatWidthForSimpleText(run, fallbackFonts, glyphBounds); |
| } |
| |
| namespace { |
| |
| enum BlobRotation { |
| NoRotation, |
| CCWRotation, |
| }; |
| |
| class GlyphBufferBloberizer { |
| STACK_ALLOCATED() |
| public: |
| GlyphBufferBloberizer(const GlyphBuffer& buffer, const Font* font, float deviceScaleFactor) |
| : m_buffer(buffer) |
| , m_font(font) |
| , m_deviceScaleFactor(deviceScaleFactor) |
| , m_hasVerticalOffsets(buffer.hasVerticalOffsets()) |
| , m_index(0) |
| , m_blobCount(0) |
| , m_rotation(buffer.isEmpty() ? NoRotation : computeBlobRotation(buffer.fontDataAt(0))) |
| { } |
| |
| bool done() const { return m_index >= m_buffer.size(); } |
| unsigned blobCount() const { return m_blobCount; } |
| |
| std::pair<RefPtr<const SkTextBlob>, BlobRotation> next() |
| { |
| ASSERT(!done()); |
| const BlobRotation currentRotation = m_rotation; |
| |
| while (m_index < m_buffer.size()) { |
| const SimpleFontData* fontData = m_buffer.fontDataAt(m_index); |
| ASSERT(fontData); |
| |
| const BlobRotation newRotation = computeBlobRotation(fontData); |
| if (newRotation != m_rotation) { |
| // We're switching to an orientation which requires a different rotation |
| // => emit the pending blob (and start a new one with the new rotation). |
| m_rotation = newRotation; |
| break; |
| } |
| |
| const unsigned start = m_index++; |
| while (m_index < m_buffer.size() && m_buffer.fontDataAt(m_index) == fontData) |
| m_index++; |
| |
| appendRun(start, m_index - start, fontData); |
| } |
| |
| m_blobCount++; |
| return std::make_pair(adoptRef(m_builder.build()), currentRotation); |
| } |
| |
| private: |
| static BlobRotation computeBlobRotation(const SimpleFontData* font) |
| { |
| // For vertical upright text we need to compensate the inherited 90deg CW rotation |
| // (using a 90deg CCW rotation). |
| return (font->platformData().isVerticalAnyUpright() && font->verticalData()) ? |
| CCWRotation : NoRotation; |
| } |
| |
| void appendRun(unsigned start, unsigned count, const SimpleFontData* fontData) |
| { |
| SkPaint paint; |
| fontData->platformData().setupPaint(&paint, m_deviceScaleFactor, m_font); |
| paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); |
| |
| const SkTextBlobBuilder::RunBuffer& buffer = m_hasVerticalOffsets |
| ? m_builder.allocRunPos(paint, count) |
| : m_builder.allocRunPosH(paint, count, 0); |
| |
| const uint16_t* glyphs = m_buffer.glyphs(start); |
| const float* offsets = m_buffer.offsets(start); |
| std::copy(glyphs, glyphs + count, buffer.glyphs); |
| |
| if (m_rotation == NoRotation) { |
| std::copy(offsets, offsets + (m_hasVerticalOffsets ? 2 * count : count), buffer.pos); |
| } else { |
| ASSERT(m_hasVerticalOffsets); |
| |
| const float verticalBaselineXOffset = fontData->getFontMetrics().floatAscent() |
| - fontData->getFontMetrics().floatAscent(IdeographicBaseline); |
| |
| // TODO(fmalita): why don't we apply this adjustment when building the glyph buffer? |
| for (unsigned i = 0; i < 2 * count; i += 2) { |
| buffer.pos[i] = SkFloatToScalar(offsets[i] + verticalBaselineXOffset); |
| buffer.pos[i + 1] = SkFloatToScalar(offsets[i + 1]); |
| } |
| } |
| } |
| |
| const GlyphBuffer& m_buffer; |
| const Font* m_font; |
| const float m_deviceScaleFactor; |
| const bool m_hasVerticalOffsets; |
| |
| SkTextBlobBuilder m_builder; |
| unsigned m_index; |
| unsigned m_blobCount; |
| BlobRotation m_rotation; |
| }; |
| |
| } // anonymous namespace |
| |
| void Font::drawGlyphBuffer(SkCanvas* canvas, const SkPaint& paint, const TextRunPaintInfo& runInfo, |
| const GlyphBuffer& glyphBuffer, const FloatPoint& point, float deviceScaleFactor) const |
| { |
| GlyphBufferBloberizer bloberizer(glyphBuffer, this, deviceScaleFactor); |
| std::pair<RefPtr<const SkTextBlob>, BlobRotation> blob; |
| |
| while (!bloberizer.done()) { |
| blob = bloberizer.next(); |
| ASSERT(blob.first); |
| |
| SkAutoCanvasRestore autoRestore(canvas, false); |
| if (blob.second == CCWRotation) { |
| canvas->save(); |
| |
| SkMatrix m; |
| m.setSinCos(-1, 0, point.x(), point.y()); |
| canvas->concat(m); |
| } |
| |
| canvas->drawTextBlob(blob.first.get(), point.x(), point.y(), paint); |
| } |
| |
| // Cache results when |
| // 1) requested by clients, and |
| // 2) the glyph buffer is encoded as a single blob, and |
| // 3) the blob is not upright/rotated |
| if (runInfo.cachedTextBlob && bloberizer.blobCount() == 1 && blob.second == NoRotation) { |
| ASSERT(!*runInfo.cachedTextBlob); |
| *runInfo.cachedTextBlob = blob.first.release(); |
| ASSERT(*runInfo.cachedTextBlob); |
| } |
| } |
| |
| static inline FloatRect pixelSnappedSelectionRect(FloatRect rect) |
| { |
| // Using roundf() rather than ceilf() for the right edge as a compromise to |
| // ensure correct caret positioning. |
| float roundedX = roundf(rect.x()); |
| return FloatRect(roundedX, rect.y(), roundf(rect.maxX() - roundedX), rect.height()); |
| } |
| |
| FloatRect Font::selectionRectForText(const TextRun& run, const FloatPoint& point, int h, int from, int to, bool accountForGlyphBounds) const |
| { |
| to = (to == -1 ? run.length() : to); |
| |
| TextRunPaintInfo runInfo(run); |
| runInfo.from = from; |
| runInfo.to = to; |
| |
| FontCachePurgePreventer purgePreventer; |
| |
| if (codePath(runInfo) != ComplexPath) |
| return pixelSnappedSelectionRect(selectionRectForSimpleText(run, point, h, from, to, accountForGlyphBounds)); |
| return pixelSnappedSelectionRect(selectionRectForComplexText(run, point, h, from, to)); |
| } |
| |
| int Font::offsetForPosition(const TextRun& run, float x, bool includePartialGlyphs) const |
| { |
| FontCachePurgePreventer purgePreventer; |
| |
| if (codePath(TextRunPaintInfo(run)) != ComplexPath && !getFontDescription().getTypesettingFeatures()) |
| return offsetForPositionForSimpleText(run, x, includePartialGlyphs); |
| |
| return offsetForPositionForComplexText(run, x, includePartialGlyphs); |
| } |
| |
| CodePath Font::codePath(const TextRunPaintInfo& runInfo) const |
| { |
| // TODO(eae): Disable the always use complex text feature on Android for now as |
| // it caused a memory regression for webview. crbug.com/577306 |
| #if !OS(ANDROID) |
| if (RuntimeEnabledFeatures::alwaysUseComplexTextEnabled() |
| || LayoutTestSupport::alwaysUseComplexTextForTest()) { |
| return ComplexPath; |
| } |
| #endif |
| |
| const TextRun& run = runInfo.run; |
| |
| if (getFontDescription().getTypesettingFeatures()) |
| return ComplexPath; |
| |
| if (m_fontDescription.featureSettings() && m_fontDescription.featureSettings()->size() > 0) |
| return ComplexPath; |
| |
| if (m_fontDescription.isVerticalBaseline()) |
| return ComplexPath; |
| |
| if (m_fontDescription.widthVariant() != RegularWidth) |
| return ComplexPath; |
| |
| // FIXME: This really shouldn't be needed but for some reason the |
| // TextRendering setting doesn't propagate to typesettingFeatures in time |
| // for the prefs width calculation. |
| if (getFontDescription().textRendering() == OptimizeLegibility || getFontDescription().textRendering() == GeometricPrecision) |
| return ComplexPath; |
| |
| if (run.is8Bit()) |
| return SimplePath; |
| |
| // Start from 0 since drawing and highlighting also measure the characters before run->from. |
| return Character::characterRangeCodePath(run.characters16(), run.length()); |
| } |
| |
| bool Font::canShapeWordByWord() const |
| { |
| if (!m_shapeWordByWordComputed) { |
| m_canShapeWordByWord = computeCanShapeWordByWord(); |
| m_shapeWordByWordComputed = true; |
| } |
| return m_canShapeWordByWord; |
| }; |
| |
| bool Font::computeCanShapeWordByWord() const |
| { |
| if (!getFontDescription().getTypesettingFeatures()) |
| return true; |
| |
| if (!primaryFont()) |
| return false; |
| |
| const FontPlatformData& platformData = primaryFont()->platformData(); |
| TypesettingFeatures features = getFontDescription().getTypesettingFeatures(); |
| return !platformData.hasSpaceInLigaturesOrKerning(features); |
| }; |
| |
| void Font::willUseFontData(const String& text) const |
| { |
| const FontFamily& family = getFontDescription().family(); |
| if (m_fontFallbackList && m_fontFallbackList->getFontSelector() && !family.familyIsEmpty()) |
| m_fontFallbackList->getFontSelector()->willUseFontData(getFontDescription(), family.family(), text); |
| } |
| |
| static inline GlyphData glyphDataForNonCJKCharacterWithGlyphOrientation(UChar32 character, bool isUpright, GlyphData& data, unsigned pageNumber) |
| { |
| if (isUpright) { |
| RefPtr<SimpleFontData> uprightFontData = data.fontData->uprightOrientationFontData(); |
| GlyphPageTreeNode* uprightNode = GlyphPageTreeNode::getNormalRootChild(uprightFontData.get(), pageNumber); |
| GlyphPage* uprightPage = uprightNode->page(); |
| if (uprightPage) { |
| GlyphData uprightData = uprightPage->glyphDataForCharacter(character); |
| // If the glyphs are the same, then we know we can just use the horizontal glyph rotated vertically to be upright. |
| if (data.glyph == uprightData.glyph) |
| return data; |
| // The glyphs are distinct, meaning that the font has a vertical-right glyph baked into it. We can't use that |
| // glyph, so we fall back to the upright data and use the horizontal glyph. |
| if (uprightData.fontData) |
| return uprightData; |
| } |
| } else { |
| RefPtr<SimpleFontData> verticalRightFontData = data.fontData->verticalRightOrientationFontData(); |
| GlyphPageTreeNode* verticalRightNode = GlyphPageTreeNode::getNormalRootChild(verticalRightFontData.get(), pageNumber); |
| GlyphPage* verticalRightPage = verticalRightNode->page(); |
| if (verticalRightPage) { |
| GlyphData verticalRightData = verticalRightPage->glyphDataForCharacter(character); |
| // If the glyphs are distinct, we will make the assumption that the font has a vertical-right glyph baked |
| // into it. |
| if (data.glyph != verticalRightData.glyph) |
| return data; |
| // The glyphs are identical, meaning that we should just use the horizontal glyph. |
| if (verticalRightData.fontData) |
| return verticalRightData; |
| } |
| } |
| return data; |
| } |
| |
| PassRefPtr<FontFallbackIterator> Font::createFontFallbackIterator( |
| FontFallbackPriority fallbackPriority) const |
| { |
| return FontFallbackIterator::create(m_fontDescription, |
| m_fontFallbackList, |
| fallbackPriority); |
| } |
| |
| GlyphData Font::glyphDataForCharacter(UChar32& c, bool mirror, bool normalizeSpace, FontDataVariant variant) const |
| { |
| ASSERT(isMainThread()); |
| |
| if (variant == AutoVariant) { |
| if (m_fontDescription.variantCaps() == FontDescription::SmallCaps) { |
| bool includeDefault = false; |
| UChar32 upperC = toUpper(c, m_fontDescription.locale(includeDefault)); |
| if (upperC != c) { |
| c = upperC; |
| variant = SmallCapsVariant; |
| } else { |
| variant = NormalVariant; |
| } |
| } else { |
| variant = NormalVariant; |
| } |
| } |
| |
| if (normalizeSpace && Character::isNormalizedCanvasSpaceCharacter(c)) |
| c = spaceCharacter; |
| |
| if (mirror) |
| c = mirroredChar(c); |
| |
| unsigned pageNumber = (c / GlyphPage::size); |
| |
| GlyphPageTreeNodeBase* node = m_fontFallbackList->getPageNode(pageNumber); |
| if (!node) { |
| node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber); |
| m_fontFallbackList->setPageNode(pageNumber, node); |
| } |
| RELEASE_ASSERT(node); // Diagnosing crbug.com/446566 crash bug. |
| |
| GlyphPage* page = 0; |
| if (variant == NormalVariant) { |
| // Fastest loop, for the common case (normal variant). |
| while (true) { |
| page = node->page(m_fontDescription.script()); |
| if (page) { |
| GlyphData data = page->glyphDataForCharacter(c); |
| if (data.fontData) { |
| if (!data.fontData->platformData().isVerticalAnyUpright() || data.fontData->isTextOrientationFallback()) |
| return data; |
| |
| bool isUpright = m_fontDescription.isVerticalUpright(c); |
| if (!isUpright || !Character::isCJKIdeographOrSymbol(c)) |
| return glyphDataForNonCJKCharacterWithGlyphOrientation(c, isUpright, data, pageNumber); |
| |
| return data; |
| } |
| |
| if (node->isSystemFallback()) |
| break; |
| } |
| |
| // Proceed with the fallback list. |
| node = toGlyphPageTreeNode(node)->getChild(fontDataAt(node->level()), pageNumber); |
| m_fontFallbackList->setPageNode(pageNumber, node); |
| } |
| } |
| if (variant != NormalVariant) { |
| while (true) { |
| page = node->page(m_fontDescription.script()); |
| if (page) { |
| GlyphData data = page->glyphDataForCharacter(c); |
| if (data.fontData) { |
| // The variantFontData function should not normally return 0. |
| // But if it does, we will just render the capital letter big. |
| RefPtr<SimpleFontData> variantFontData = data.fontData->variantFontData(m_fontDescription, variant); |
| if (!variantFontData) |
| return data; |
| |
| GlyphPageTreeNode* variantNode = GlyphPageTreeNode::getNormalRootChild(variantFontData.get(), pageNumber); |
| GlyphPage* variantPage = variantNode->page(); |
| if (variantPage) { |
| GlyphData data = variantPage->glyphDataForCharacter(c); |
| if (data.fontData) |
| return data; |
| } |
| |
| // Do not attempt system fallback off the variantFontData. This is the very unlikely case that |
| // a font has the lowercase character but the small caps font does not have its uppercase version. |
| return variantFontData->missingGlyphData(); |
| } |
| |
| if (node->isSystemFallback()) |
| break; |
| } |
| |
| // Proceed with the fallback list. |
| node = toGlyphPageTreeNode(node)->getChild(fontDataAt(node->level()), pageNumber); |
| m_fontFallbackList->setPageNode(pageNumber, node); |
| } |
| } |
| |
| ASSERT(page); |
| ASSERT(node->isSystemFallback()); |
| |
| // System fallback is character-dependent. When we get here, we |
| // know that the character in question isn't in the system fallback |
| // font's glyph page. Try to lazily create it here. |
| |
| // FIXME: Unclear if this should normalizeSpaces above 0xFFFF. |
| // Doing so changes fast/text/international/plane2-diffs.html |
| UChar32 characterToRender = c; |
| if (characterToRender <= 0xFFFF) |
| characterToRender = Character::normalizeSpaces(characterToRender); |
| |
| const FontData* fontData = fontDataAt(0); |
| if (fontData) { |
| const SimpleFontData* fontDataToSubstitute = fontData->fontDataForCharacter(characterToRender); |
| RefPtr<SimpleFontData> characterFontData = FontCache::fontCache()->fallbackFontForCharacter(m_fontDescription, characterToRender, fontDataToSubstitute); |
| if (characterFontData && variant != NormalVariant) { |
| characterFontData = characterFontData->variantFontData(m_fontDescription, variant); |
| } |
| if (characterFontData) { |
| // Got the fallback glyph and font. |
| unsigned pageNumberForRendering = characterToRender / GlyphPage::size; |
| GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData.get(), pageNumberForRendering)->page(); |
| GlyphData data = fallbackPage && fallbackPage->glyphForCharacter(characterToRender) ? fallbackPage->glyphDataForCharacter(characterToRender) : characterFontData->missingGlyphData(); |
| // Cache it so we don't have to do system fallback again next time. |
| if (variant == NormalVariant) { |
| page->setGlyphDataForCharacter(c, data.glyph, data.fontData); |
| data.fontData->setMaxGlyphPageTreeLevel(std::max(data.fontData->maxGlyphPageTreeLevel(), node->level())); |
| if (data.fontData->platformData().isVerticalAnyUpright() && !data.fontData->isTextOrientationFallback() && !Character::isCJKIdeographOrSymbol(characterToRender)) |
| return glyphDataForNonCJKCharacterWithGlyphOrientation(characterToRender, m_fontDescription.isVerticalUpright(characterToRender), data, pageNumberForRendering); |
| } |
| return data; |
| } |
| } |
| |
| // Even system fallback can fail; use the missing glyph in that case. |
| // FIXME: It would be nicer to use the missing glyph from the last resort font instead. |
| ASSERT(primaryFont()); |
| GlyphData data = primaryFont()->missingGlyphData(); |
| if (variant == NormalVariant) { |
| page->setGlyphDataForCharacter(c, data.glyph, data.fontData); |
| data.fontData->setMaxGlyphPageTreeLevel(std::max(data.fontData->maxGlyphPageTreeLevel(), node->level())); |
| } |
| return data; |
| } |
| |
| bool Font::getEmphasisMarkGlyphData(const AtomicString& mark, GlyphData& glyphData) const |
| { |
| if (mark.isEmpty()) |
| return false; |
| |
| TextRun emphasisMarkRun(mark, mark.length()); |
| TextRunPaintInfo emphasisPaintInfo(emphasisMarkRun); |
| GlyphBuffer glyphBuffer; |
| buildGlyphBuffer(emphasisPaintInfo, glyphBuffer); |
| |
| if (glyphBuffer.isEmpty()) |
| return false; |
| |
| ASSERT(glyphBuffer.fontDataAt(0)); |
| glyphData.fontData = glyphBuffer.fontDataAt(0)->emphasisMarkFontData(m_fontDescription).get(); |
| glyphData.glyph = glyphBuffer.glyphAt(0); |
| |
| return true; |
| } |
| |
| int Font::emphasisMarkAscent(const AtomicString& mark) const |
| { |
| FontCachePurgePreventer purgePreventer; |
| |
| GlyphData markGlyphData; |
| if (!getEmphasisMarkGlyphData(mark, markGlyphData)) |
| return 0; |
| |
| const SimpleFontData* markFontData = markGlyphData.fontData; |
| ASSERT(markFontData); |
| if (!markFontData) |
| return 0; |
| |
| return markFontData->getFontMetrics().ascent(); |
| } |
| |
| int Font::emphasisMarkDescent(const AtomicString& mark) const |
| { |
| FontCachePurgePreventer purgePreventer; |
| |
| GlyphData markGlyphData; |
| if (!getEmphasisMarkGlyphData(mark, markGlyphData)) |
| return 0; |
| |
| const SimpleFontData* markFontData = markGlyphData.fontData; |
| ASSERT(markFontData); |
| if (!markFontData) |
| return 0; |
| |
| return markFontData->getFontMetrics().descent(); |
| } |
| |
| int Font::emphasisMarkHeight(const AtomicString& mark) const |
| { |
| FontCachePurgePreventer purgePreventer; |
| |
| GlyphData markGlyphData; |
| if (!getEmphasisMarkGlyphData(mark, markGlyphData)) |
| return 0; |
| |
| const SimpleFontData* markFontData = markGlyphData.fontData; |
| ASSERT(markFontData); |
| if (!markFontData) |
| return 0; |
| |
| return markFontData->getFontMetrics().height(); |
| } |
| |
| float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, FloatRect* glyphBounds) const |
| { |
| CachingWordShaper shaper(m_fontFallbackList->shapeCache(m_fontDescription)); |
| float width = shaper.width(this, run, fallbackFonts, glyphBounds); |
| return width; |
| } |
| |
| // Return the code point index for the given |x| offset into the text run. |
| int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, |
| bool includePartialGlyphs) const |
| { |
| CachingWordShaper shaper(m_fontFallbackList->shapeCache(m_fontDescription)); |
| return shaper.offsetForPosition(this, run, xFloat, includePartialGlyphs); |
| } |
| |
| // Return the rectangle for selecting the given range of code-points in the TextRun. |
| FloatRect Font::selectionRectForComplexText(const TextRun& run, |
| const FloatPoint& point, int height, int from, int to) const |
| { |
| CachingWordShaper shaper(m_fontFallbackList->shapeCache(m_fontDescription)); |
| CharacterRange range = shaper.getCharacterRange(this, run, from, to); |
| return FloatRect(point.x() + range.start, point.y(), range.width(), height); |
| } |
| |
| CharacterRange Font::getCharacterRange(const TextRun& run, unsigned from, unsigned to) const |
| { |
| FontCachePurgePreventer purgePreventer; |
| CachingWordShaper shaper(m_fontFallbackList->shapeCache(m_fontDescription)); |
| return shaper.getCharacterRange(this, run, from, to); |
| } |
| |
| Vector<CharacterRange> Font::individualCharacterRanges(const TextRun& run) const |
| { |
| // TODO(pdr): Android is temporarily (crbug.com/577306) using the old simple |
| // shaper and using the complex shaper here can show differences between |
| // the two shapers. This function is currently only called through SVG |
| // which now exclusively uses the complex shaper, so the primary difference |
| // will be improved shaping in SVG when compared to HTML. |
| FontCachePurgePreventer purgePreventer; |
| CachingWordShaper shaper(m_fontFallbackList->shapeCache(m_fontDescription)); |
| auto ranges = shaper.individualCharacterRanges(this, run); |
| DCHECK_EQ(ranges.size(), run.length()); |
| return ranges; |
| } |
| |
| float Font::floatWidthForSimpleText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, FloatRect* glyphBounds) const |
| { |
| SimpleShaper shaper(this, run, nullptr, fallbackFonts, glyphBounds); |
| shaper.advance(run.length()); |
| return shaper.runWidthSoFar(); |
| } |
| |
| FloatRect Font::selectionRectForSimpleText(const TextRun& run, const FloatPoint& point, int h, int from, int to, bool accountForGlyphBounds) const |
| { |
| FloatRect bounds; |
| SimpleShaper shaper(this, run, nullptr, nullptr, accountForGlyphBounds ? &bounds : nullptr); |
| shaper.advance(from); |
| float fromX = shaper.runWidthSoFar(); |
| shaper.advance(to); |
| float toX = shaper.runWidthSoFar(); |
| |
| if (run.rtl()) { |
| shaper.advance(run.length()); |
| float totalWidth = shaper.runWidthSoFar(); |
| float beforeWidth = fromX; |
| float afterWidth = toX; |
| fromX = totalWidth - afterWidth; |
| toX = totalWidth - beforeWidth; |
| } |
| |
| return FloatRect(point.x() + fromX, |
| accountForGlyphBounds ? bounds.y(): point.y(), |
| toX - fromX, |
| accountForGlyphBounds ? bounds.maxY()- bounds.y(): h); |
| } |
| |
| int Font::offsetForPositionForSimpleText(const TextRun& run, float x, bool includePartialGlyphs) const |
| { |
| float delta = x; |
| |
| SimpleShaper shaper(this, run); |
| unsigned offset; |
| if (run.rtl()) { |
| delta -= floatWidthForSimpleText(run); |
| while (1) { |
| offset = shaper.currentOffset(); |
| float w; |
| if (!shaper.advanceOneCharacter(w)) |
| break; |
| delta += w; |
| if (includePartialGlyphs) { |
| if (delta - w / 2 >= 0) |
| break; |
| } else { |
| if (delta >= 0) |
| break; |
| } |
| } |
| } else { |
| while (1) { |
| offset = shaper.currentOffset(); |
| float w; |
| if (!shaper.advanceOneCharacter(w)) |
| break; |
| delta -= w; |
| if (includePartialGlyphs) { |
| if (delta + w / 2 <= 0) |
| break; |
| } else { |
| if (delta <= 0) |
| break; |
| } |
| } |
| } |
| |
| return offset; |
| } |
| |
| bool Font::loadingCustomFonts() const |
| { |
| return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts(); |
| } |
| |
| bool Font::isFallbackValid() const |
| { |
| return !m_fontFallbackList || m_fontFallbackList->isValid(); |
| } |
| |
| } // namespace blink |
