| /* |
| * 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. |
| * |
| * 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 "flutter/sky/engine/platform/fonts/Font.h" |
| |
| #include "flutter/sky/engine/platform/LayoutUnit.h" |
| #include "flutter/sky/engine/platform/fonts/Character.h" |
| #include "flutter/sky/engine/platform/fonts/FontCache.h" |
| #include "flutter/sky/engine/platform/fonts/FontFallbackList.h" |
| #include "flutter/sky/engine/platform/fonts/FontPlatformFeatures.h" |
| #include "flutter/sky/engine/platform/fonts/GlyphBuffer.h" |
| #include "flutter/sky/engine/platform/fonts/GlyphPageTreeNode.h" |
| #include "flutter/sky/engine/platform/fonts/SimpleFontData.h" |
| #include "flutter/sky/engine/platform/fonts/WidthIterator.h" |
| #include "flutter/sky/engine/platform/fonts/harfbuzz/HarfBuzzShaper.h" |
| #include "flutter/sky/engine/platform/geometry/FloatRect.h" |
| #include "flutter/sky/engine/platform/graphics/GraphicsContext.h" |
| #include "flutter/sky/engine/platform/text/TextRun.h" |
| #include "flutter/sky/engine/wtf/MainThread.h" |
| #include "flutter/sky/engine/wtf/StdLibExtras.h" |
| #include "flutter/sky/engine/wtf/unicode/CharacterNames.h" |
| #include "flutter/sky/engine/wtf/unicode/Unicode.h" |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace blink { |
| |
| CodePath Font::s_codePath = AutoPath; |
| |
| // ============================================================================================ |
| // Font Implementation (Cross-Platform Portion) |
| // ============================================================================================ |
| |
| Font::Font() {} |
| |
| Font::Font(const FontDescription& fd) : m_fontDescription(fd) {} |
| |
| Font::Font(const Font& other) |
| : m_fontDescription(other.m_fontDescription), |
| m_fontFallbackList(other.m_fontFallbackList) {} |
| |
| Font& Font::operator=(const Font& other) { |
| m_fontDescription = other.m_fontDescription; |
| m_fontFallbackList = other.m_fontFallbackList; |
| return *this; |
| } |
| |
| bool Font::operator==(const Font& other) const { |
| // Our FontData don't have to be checked, since checking the font description |
| // will be fine. |
| // FIXME: This does not work if the font was made with the FontPlatformData |
| // constructor. |
| if (loadingCustomFonts() || other.loadingCustomFonts()) |
| return false; |
| |
| FontSelector* first = |
| m_fontFallbackList ? m_fontFallbackList->fontSelector() : 0; |
| FontSelector* second = |
| other.m_fontFallbackList ? other.m_fontFallbackList->fontSelector() : 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(PassRefPtr<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, |
| ForTextEmphasisOrNot forTextEmphasis) const { |
| if (codePath(runInfo.run) == ComplexPath) { |
| HarfBuzzShaper shaper(this, runInfo.run, |
| (forTextEmphasis == ForTextEmphasis) |
| ? HarfBuzzShaper::ForTextEmphasis |
| : HarfBuzzShaper::NotForTextEmphasis); |
| shaper.setDrawRange(runInfo.from, runInfo.to); |
| shaper.shape(&glyphBuffer); |
| |
| return 0; |
| } |
| |
| WidthIterator it(this, runInfo.run, nullptr, false, forTextEmphasis); |
| it.advance(runInfo.from); |
| float beforeWidth = it.runWidthSoFar(); |
| it.advance(runInfo.to, &glyphBuffer); |
| |
| if (runInfo.run.ltr()) |
| return beforeWidth; |
| |
| // RTL |
| float afterWidth = it.runWidthSoFar(); |
| it.advance(runInfo.run.length()); |
| glyphBuffer.reverse(); |
| |
| return it.runWidthSoFar() - afterWidth; |
| } |
| |
| void Font::drawText(GraphicsContext* context, |
| const TextRunPaintInfo& runInfo, |
| const FloatPoint& point) const { |
| // Don't draw anything while we are using custom fonts that are in the process |
| // of loading. |
| if (shouldSkipDrawing()) |
| return; |
| |
| TextDrawingModeFlags textMode = context->textDrawingMode(); |
| if (!(textMode & TextModeFill) && |
| !((textMode & TextModeStroke) && context->hasStroke())) |
| return; |
| |
| if (runInfo.cachedTextBlob && runInfo.cachedTextBlob->get()) { |
| // we have a pre-cached blob -- happy joy! |
| drawTextBlob(context, runInfo.cachedTextBlob->get(), point.data()); |
| return; |
| } |
| |
| { |
| FontCachePurgePreventer preventer; |
| GlyphBuffer glyphBuffer; |
| float initialAdvance = buildGlyphBuffer(runInfo, glyphBuffer); |
| |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| // Enabling text-blobs forces the blob rendering path even for uncacheable |
| // blobs. |
| TextBlobPtr uncacheableTextBlob; |
| TextBlobPtr& textBlob = |
| runInfo.cachedTextBlob ? *runInfo.cachedTextBlob : uncacheableTextBlob; |
| FloatRect blobBounds = runInfo.bounds; |
| blobBounds.moveBy(-point); |
| |
| textBlob = buildTextBlob(glyphBuffer, initialAdvance, blobBounds); |
| if (textBlob) { |
| drawTextBlob(context, textBlob.get(), point.data()); |
| return; |
| } |
| |
| drawGlyphBuffer(context, runInfo, glyphBuffer, |
| FloatPoint(point.x() + initialAdvance, point.y())); |
| } |
| } |
| |
| float Font::drawUncachedText( |
| GraphicsContext* context, |
| const TextRunPaintInfo& runInfo, |
| const FloatPoint& point, |
| CustomFontNotReadyAction customFontNotReadyAction) 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 0; |
| |
| TextDrawingModeFlags textMode = context->textDrawingMode(); |
| if (!(textMode & TextModeFill) && |
| !((textMode & TextModeStroke) && context->hasStroke())) |
| return 0; |
| |
| GlyphBuffer glyphBuffer; |
| float initialAdvance = buildGlyphBuffer(runInfo, glyphBuffer); |
| |
| if (glyphBuffer.isEmpty()) |
| return 0; |
| |
| return drawGlyphBuffer(context, runInfo, glyphBuffer, |
| FloatPoint(point.x() + initialAdvance, point.y())); |
| } |
| |
| void Font::drawEmphasisMarks(GraphicsContext* context, |
| const TextRunPaintInfo& runInfo, |
| const AtomicString& mark, |
| const FloatPoint& point) const { |
| if (shouldSkipDrawing()) |
| return; |
| |
| GlyphBuffer glyphBuffer; |
| float initialAdvance = |
| buildGlyphBuffer(runInfo, glyphBuffer, ForTextEmphasis); |
| |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| drawEmphasisMarks(context, runInfo, glyphBuffer, mark, |
| FloatPoint(point.x() + initialAdvance, point.y())); |
| } |
| |
| static inline void updateGlyphOverflowFromBounds( |
| const IntRectExtent& glyphBounds, |
| const FontMetrics& fontMetrics, |
| GlyphOverflow* glyphOverflow) { |
| glyphOverflow->top = std::max<int>( |
| glyphOverflow->top, |
| glyphBounds.top() - |
| (glyphOverflow->computeBounds ? 0 : fontMetrics.ascent())); |
| glyphOverflow->bottom = std::max<int>( |
| glyphOverflow->bottom, |
| glyphBounds.bottom() - |
| (glyphOverflow->computeBounds ? 0 : fontMetrics.descent())); |
| glyphOverflow->left = glyphBounds.left(); |
| glyphOverflow->right = glyphBounds.right(); |
| } |
| |
| float Font::width(const TextRun& run, |
| HashSet<const SimpleFontData*>* fallbackFonts, |
| GlyphOverflow* glyphOverflow) const { |
| CodePath codePathToUse = codePath(run); |
| if (codePathToUse != ComplexPath) { |
| // The simple path can optimize the case where glyph overflow is not |
| // observable. |
| if (codePathToUse != SimpleWithGlyphOverflowPath && |
| (glyphOverflow && !glyphOverflow->computeBounds)) |
| glyphOverflow = 0; |
| } |
| |
| bool hasWordSpacingOrLetterSpacing = |
| fontDescription().wordSpacing() || fontDescription().letterSpacing(); |
| bool isCacheable = |
| codePathToUse == ComplexPath && |
| !hasWordSpacingOrLetterSpacing // Word spacing and letter spacing can |
| // change the width of a word. |
| && !run.allowTabs(); // If we allow tabs and a tab occurs inside a word, |
| // the width of the word varies based on its |
| // position on the line. |
| |
| WidthCacheEntry* cacheEntry = |
| isCacheable ? m_fontFallbackList->widthCache().add(run, WidthCacheEntry()) |
| : 0; |
| if (cacheEntry && cacheEntry->isValid()) { |
| if (glyphOverflow) |
| updateGlyphOverflowFromBounds(cacheEntry->glyphBounds, fontMetrics(), |
| glyphOverflow); |
| return cacheEntry->width; |
| } |
| |
| float result; |
| IntRectExtent glyphBounds; |
| if (codePathToUse == ComplexPath) { |
| result = floatWidthForComplexText(run, fallbackFonts, &glyphBounds); |
| } else { |
| ASSERT(!isCacheable); |
| result = floatWidthForSimpleText(run, fallbackFonts, |
| glyphOverflow ? &glyphBounds : 0); |
| } |
| |
| if (cacheEntry && (!fallbackFonts || fallbackFonts->isEmpty())) { |
| cacheEntry->glyphBounds = glyphBounds; |
| cacheEntry->width = result; |
| } |
| |
| if (glyphOverflow) |
| updateGlyphOverflowFromBounds(glyphBounds, fontMetrics(), glyphOverflow); |
| return result; |
| } |
| |
| float Font::width(const TextRun& run, |
| int& charsConsumed, |
| Glyph& glyphId) const { |
| charsConsumed = run.length(); |
| glyphId = 0; |
| return width(run); |
| } |
| |
| FloatRect Font::selectionRectForText(const TextRun& run, |
| const FloatPoint& point, |
| int h, |
| int from, |
| int to, |
| bool accountForGlyphBounds) const { |
| to = (to == -1 ? run.length() : to); |
| |
| CodePath codePathToUse = codePath(run); |
| // FIXME: Use the fast code path once it handles partial runs with kerning and |
| // ligatures. See http://webkit.org/b/100050 |
| if (codePathToUse != ComplexPath && fontDescription().typesettingFeatures() && |
| (from || to != run.length())) |
| codePathToUse = ComplexPath; |
| |
| if (codePathToUse != ComplexPath) |
| return selectionRectForSimpleText(run, point, h, from, to, |
| accountForGlyphBounds); |
| |
| return selectionRectForComplexText(run, point, h, from, to); |
| } |
| |
| int Font::offsetForPosition(const TextRun& run, |
| float x, |
| bool includePartialGlyphs) const { |
| // FIXME: Use the fast code path once it handles partial runs with kerning and |
| // ligatures. See http://webkit.org/b/100050 |
| if (codePath(run) != ComplexPath && !fontDescription().typesettingFeatures()) |
| return offsetForPositionForSimpleText(run, x, includePartialGlyphs); |
| |
| return offsetForPositionForComplexText(run, x, includePartialGlyphs); |
| } |
| |
| void Font::setCodePath(CodePath p) { |
| s_codePath = p; |
| } |
| |
| CodePath Font::codePath() { |
| return s_codePath; |
| } |
| |
| CodePath Font::codePath(const TextRun& run) const { |
| if (s_codePath != AutoPath) |
| return s_codePath; |
| |
| if (m_fontDescription.featureSettings() && |
| m_fontDescription.featureSettings()->size() > 0 && |
| m_fontDescription.letterSpacing() == 0) |
| return ComplexPath; |
| |
| if (m_fontDescription.widthVariant() != RegularWidth) |
| return ComplexPath; |
| |
| if (run.length() > 1 && fontDescription().typesettingFeatures()) |
| return ComplexPath; |
| |
| if (!run.characterScanForCodePath()) |
| return SimplePath; |
| |
| 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()); |
| } |
| |
| void Font::willUseFontData(UChar32 character) const { |
| const FontFamily& family = fontDescription().family(); |
| if (m_fontFallbackList && m_fontFallbackList->fontSelector() && |
| !family.familyIsEmpty()) |
| m_fontFallbackList->fontSelector()->willUseFontData( |
| fontDescription(), family.family(), character); |
| } |
| |
| static inline bool isInRange(UChar32 character, |
| UChar32 lowerBound, |
| UChar32 upperBound) { |
| return character >= lowerBound && character <= upperBound; |
| } |
| |
| static bool shouldIgnoreRotation(UChar32 character) { |
| if (character == 0x000A7 || character == 0x000A9 || character == 0x000AE) |
| return true; |
| |
| if (character == 0x000B6 || character == 0x000BC || character == 0x000BD || |
| character == 0x000BE) |
| return true; |
| |
| if (isInRange(character, 0x002E5, 0x002EB)) |
| return true; |
| |
| if (isInRange(character, 0x01100, 0x011FF) || |
| isInRange(character, 0x01401, 0x0167F) || |
| isInRange(character, 0x01800, 0x018FF)) |
| return true; |
| |
| if (character == 0x02016 || character == 0x02018 || character == 0x02019 || |
| character == 0x02020 || character == 0x02021 || character == 0x2030 || |
| character == 0x02031) |
| return true; |
| |
| if (isInRange(character, 0x0203B, 0x0203D) || character == 0x02042 || |
| character == 0x02044 || character == 0x02047 || character == 0x02048 || |
| character == 0x02049 || character == 0x2051) |
| return true; |
| |
| if (isInRange(character, 0x02065, 0x02069) || |
| isInRange(character, 0x020DD, 0x020E0) || |
| isInRange(character, 0x020E2, 0x020E4) || |
| isInRange(character, 0x02100, 0x02117) || |
| isInRange(character, 0x02119, 0x02131) || |
| isInRange(character, 0x02133, 0x0213F)) |
| return true; |
| |
| if (isInRange(character, 0x02145, 0x0214A) || character == 0x0214C || |
| character == 0x0214D || isInRange(character, 0x0214F, 0x0218F)) |
| return true; |
| |
| if (isInRange(character, 0x02300, 0x02307) || |
| isInRange(character, 0x0230C, 0x0231F) || |
| isInRange(character, 0x02322, 0x0232B) || |
| isInRange(character, 0x0237D, 0x0239A) || |
| isInRange(character, 0x023B4, 0x023B6) || |
| isInRange(character, 0x023BA, 0x023CF) || |
| isInRange(character, 0x023D1, 0x023DB) || |
| isInRange(character, 0x023E2, 0x024FF)) |
| return true; |
| |
| if (isInRange(character, 0x025A0, 0x02619) || |
| isInRange(character, 0x02620, 0x02767) || |
| isInRange(character, 0x02776, 0x02793) || |
| isInRange(character, 0x02B12, 0x02B2F) || |
| isInRange(character, 0x02B4D, 0x02BFF) || |
| isInRange(character, 0x02E80, 0x03007)) |
| return true; |
| |
| if (character == 0x03012 || character == 0x03013 || |
| isInRange(character, 0x03020, 0x0302F) || |
| isInRange(character, 0x03031, 0x0309F) || |
| isInRange(character, 0x030A1, 0x030FB) || |
| isInRange(character, 0x030FD, 0x0A4CF)) |
| return true; |
| |
| if (isInRange(character, 0x0A840, 0x0A87F) || |
| isInRange(character, 0x0A960, 0x0A97F) || |
| isInRange(character, 0x0AC00, 0x0D7FF) || |
| isInRange(character, 0x0E000, 0x0FAFF)) |
| return true; |
| |
| if (isInRange(character, 0x0FE10, 0x0FE1F) || |
| isInRange(character, 0x0FE30, 0x0FE48) || |
| isInRange(character, 0x0FE50, 0x0FE57) || |
| isInRange(character, 0x0FE5F, 0x0FE62) || |
| isInRange(character, 0x0FE67, 0x0FE6F)) |
| return true; |
| |
| if (isInRange(character, 0x0FF01, 0x0FF07) || |
| isInRange(character, 0x0FF0A, 0x0FF0C) || |
| isInRange(character, 0x0FF0E, 0x0FF19) || |
| isInRange(character, 0x0FF1F, 0x0FF3A)) |
| return true; |
| |
| if (character == 0x0FF3C || character == 0x0FF3E) |
| return true; |
| |
| if (isInRange(character, 0x0FF40, 0x0FF5A) || |
| isInRange(character, 0x0FFE0, 0x0FFE2) || |
| isInRange(character, 0x0FFE4, 0x0FFE7) || |
| isInRange(character, 0x0FFF0, 0x0FFF8) || character == 0x0FFFD) |
| return true; |
| |
| if (isInRange(character, 0x13000, 0x1342F) || |
| isInRange(character, 0x1B000, 0x1B0FF) || |
| isInRange(character, 0x1D000, 0x1D1FF) || |
| isInRange(character, 0x1D300, 0x1D37F) || |
| isInRange(character, 0x1F000, 0x1F64F) || |
| isInRange(character, 0x1F680, 0x1F77F)) |
| return true; |
| |
| if (isInRange(character, 0x20000, 0x2FFFD) || |
| isInRange(character, 0x30000, 0x3FFFD)) |
| return true; |
| |
| return false; |
| } |
| |
| static inline std::pair<GlyphData, GlyphPage*> |
| glyphDataAndPageForNonCJKCharacterWithGlyphOrientation( |
| UChar32 character, |
| NonCJKGlyphOrientation orientation, |
| GlyphData& data, |
| GlyphPage* page, |
| unsigned pageNumber) { |
| if (orientation == NonCJKGlyphOrientationUpright || |
| shouldIgnoreRotation(character)) { |
| RefPtr<SimpleFontData> uprightFontData = |
| data.fontData->uprightOrientationFontData(); |
| GlyphPageTreeNode* uprightNode = |
| GlyphPageTreeNode::getRootChild(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 std::make_pair(data, page); |
| // 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 std::make_pair(uprightData, uprightPage); |
| } |
| } else if (orientation == NonCJKGlyphOrientationVerticalRight) { |
| RefPtr<SimpleFontData> verticalRightFontData = |
| data.fontData->verticalRightOrientationFontData(); |
| GlyphPageTreeNode* verticalRightNode = GlyphPageTreeNode::getRootChild( |
| 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 std::make_pair(data, page); |
| // The glyphs are identical, meaning that we should just use the |
| // horizontal glyph. |
| if (verticalRightData.fontData) |
| return std::make_pair(verticalRightData, verticalRightPage); |
| } |
| } |
| return std::make_pair(data, page); |
| } |
| |
| std::pair<GlyphData, GlyphPage*> Font::glyphDataAndPageForCharacter( |
| UChar32 c, |
| bool mirror, |
| FontDataVariant variant) const { |
| ASSERT(isMainThread()); |
| |
| if (variant == AutoVariant) { |
| if (m_fontDescription.variant() == FontVariantSmallCaps && |
| !primaryFont()->isSVGFont()) { |
| UChar32 upperC = toUpper(c); |
| if (upperC != c) { |
| c = upperC; |
| variant = SmallCapsVariant; |
| } else { |
| variant = NormalVariant; |
| } |
| } else { |
| variant = NormalVariant; |
| } |
| } |
| |
| if (mirror) |
| c = mirroredChar(c); |
| |
| unsigned pageNumber = (c / GlyphPage::size); |
| |
| GlyphPageTreeNode* node = m_fontFallbackList->getPageNode(pageNumber); |
| if (!node) { |
| node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber); |
| m_fontFallbackList->setPageNode(pageNumber, node); |
| } |
| |
| GlyphPage* page = 0; |
| if (variant == NormalVariant) { |
| // Fastest loop, for the common case (normal variant). |
| while (true) { |
| page = node->page(); |
| if (page) { |
| GlyphData data = page->glyphDataForCharacter(c); |
| if (data.fontData && |
| (data.fontData->platformData().orientation() == Horizontal || |
| data.fontData->isTextOrientationFallback())) |
| return std::make_pair(data, page); |
| |
| if (data.fontData) { |
| if (Character::isCJKIdeographOrSymbol(c)) { |
| if (!data.fontData->hasVerticalGlyphs()) { |
| // Use the broken ideograph font data. The broken ideograph font |
| // will use the horizontal width of glyphs to make sure you get a |
| // square (even for broken glyphs like symbols used for |
| // punctuation). |
| variant = BrokenIdeographVariant; |
| break; |
| } |
| } else { |
| return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation( |
| c, m_fontDescription.nonCJKGlyphOrientation(), data, page, |
| pageNumber); |
| } |
| |
| return std::make_pair(data, page); |
| } |
| |
| if (node->isSystemFallback()) |
| break; |
| } |
| |
| // Proceed with the fallback list. |
| node = node->getChild(fontDataAt(node->level()), pageNumber); |
| m_fontFallbackList->setPageNode(pageNumber, node); |
| } |
| } |
| if (variant != NormalVariant) { |
| while (true) { |
| page = node->page(); |
| 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 std::make_pair(data, page); |
| |
| GlyphPageTreeNode* variantNode = GlyphPageTreeNode::getRootChild( |
| variantFontData.get(), pageNumber); |
| GlyphPage* variantPage = variantNode->page(); |
| if (variantPage) { |
| GlyphData data = variantPage->glyphDataForCharacter(c); |
| if (data.fontData) |
| return std::make_pair(data, variantPage); |
| } |
| |
| // 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 std::make_pair(variantFontData->missingGlyphData(), page); |
| } |
| |
| if (node->isSystemFallback()) |
| break; |
| } |
| |
| // Proceed with the fallback list. |
| node = 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 SimpleFontData* fontDataToSubstitute = |
| fontDataAt(0)->fontDataForCharacter(characterToRender); |
| RefPtr<SimpleFontData> characterFontData = |
| FontCache::fontCache()->fallbackFontForCharacter( |
| m_fontDescription, characterToRender, fontDataToSubstitute); |
| if (characterFontData) { |
| if (characterFontData->platformData().orientation() == Vertical && |
| !characterFontData->hasVerticalGlyphs() && |
| Character::isCJKIdeographOrSymbol(c)) |
| variant = BrokenIdeographVariant; |
| if (variant != NormalVariant) |
| characterFontData = |
| characterFontData->variantFontData(m_fontDescription, variant); |
| } |
| if (characterFontData) { |
| // Got the fallback glyph and font. |
| GlyphPage* fallbackPage = |
| GlyphPageTreeNode::getRootChild(characterFontData.get(), pageNumber) |
| ->page(); |
| GlyphData data = fallbackPage && fallbackPage->glyphForCharacter(c) |
| ? fallbackPage->glyphDataForCharacter(c) |
| : 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 (!Character::isCJKIdeographOrSymbol(c) && |
| data.fontData->platformData().orientation() != Horizontal && |
| !data.fontData->isTextOrientationFallback()) |
| return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation( |
| c, m_fontDescription.nonCJKGlyphOrientation(), data, page, |
| pageNumber); |
| } |
| return std::make_pair(data, page); |
| } |
| |
| // 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. |
| 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 std::make_pair(data, page); |
| } |
| |
| bool Font::primaryFontHasGlyphForCharacter(UChar32 character) const { |
| unsigned pageNumber = (character / GlyphPage::size); |
| |
| GlyphPageTreeNode* node = |
| GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber); |
| GlyphPage* page = node->page(); |
| |
| return page && page->glyphForCharacter(character); |
| } |
| |
| // FIXME: This function may not work if the emphasis mark uses a complex script, |
| // but none of the standard emphasis marks do so. |
| bool Font::getEmphasisMarkGlyphData(const AtomicString& mark, |
| GlyphData& glyphData) const { |
| if (mark.isEmpty()) |
| return false; |
| |
| UChar32 character = mark[0]; |
| |
| if (U16_IS_SURROGATE(character)) { |
| if (!U16_IS_SURROGATE_LEAD(character)) |
| return false; |
| |
| if (mark.length() < 2) |
| return false; |
| |
| UChar low = mark[1]; |
| if (!U16_IS_TRAIL(low)) |
| return false; |
| |
| character = U16_GET_SUPPLEMENTARY(character, low); |
| } |
| |
| glyphData = glyphDataForCharacter(character, false, EmphasisMarkVariant); |
| 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->fontMetrics().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->fontMetrics().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->fontMetrics().height(); |
| } |
| |
| float Font::drawGlyphBuffer(GraphicsContext* context, |
| const TextRunPaintInfo& runInfo, |
| const GlyphBuffer& glyphBuffer, |
| const FloatPoint& point) const { |
| // Draw each contiguous run of glyphs that use the same font data. |
| const SimpleFontData* fontData = glyphBuffer.fontDataAt(0); |
| FloatPoint startPoint(point); |
| float advanceSoFar = 0; |
| unsigned lastFrom = 0; |
| unsigned nextGlyph = 0; |
| while (nextGlyph < glyphBuffer.size()) { |
| const SimpleFontData* nextFontData = glyphBuffer.fontDataAt(nextGlyph); |
| if (nextFontData != fontData) { |
| drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, |
| startPoint, runInfo.bounds); |
| lastFrom = nextGlyph; |
| fontData = nextFontData; |
| startPoint += FloatSize(advanceSoFar, 0); |
| advanceSoFar = 0; |
| } |
| advanceSoFar += glyphBuffer.advanceAt(nextGlyph); |
| nextGlyph++; |
| } |
| drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, |
| startPoint, runInfo.bounds); |
| startPoint += FloatSize(advanceSoFar, 0); |
| return startPoint.x() - point.x(); |
| } |
| |
| inline static float offsetToMiddleOfGlyph(const SimpleFontData* fontData, |
| Glyph glyph) { |
| if (fontData->platformData().orientation() == Horizontal) { |
| FloatRect bounds = fontData->boundsForGlyph(glyph); |
| return bounds.x() + bounds.width() / 2; |
| } |
| // FIXME: Use glyph bounds once they make sense for vertical fonts. |
| return fontData->widthForGlyph(glyph) / 2; |
| } |
| |
| inline static float offsetToMiddleOfAdvanceAtIndex( |
| const GlyphBuffer& glyphBuffer, |
| size_t i) { |
| return glyphBuffer.advanceAt(i) / 2; |
| } |
| |
| void Font::drawEmphasisMarks(GraphicsContext* context, |
| const TextRunPaintInfo& runInfo, |
| const GlyphBuffer& glyphBuffer, |
| const AtomicString& mark, |
| const FloatPoint& point) const { |
| FontCachePurgePreventer purgePreventer; |
| |
| GlyphData markGlyphData; |
| if (!getEmphasisMarkGlyphData(mark, markGlyphData)) |
| return; |
| |
| const SimpleFontData* markFontData = markGlyphData.fontData; |
| ASSERT(markFontData); |
| if (!markFontData) |
| return; |
| |
| Glyph markGlyph = markGlyphData.glyph; |
| Glyph spaceGlyph = markFontData->spaceGlyph(); |
| |
| float middleOfLastGlyph = offsetToMiddleOfAdvanceAtIndex(glyphBuffer, 0); |
| FloatPoint startPoint(point.x() + middleOfLastGlyph - |
| offsetToMiddleOfGlyph(markFontData, markGlyph), |
| point.y()); |
| |
| GlyphBuffer markBuffer; |
| for (unsigned i = 0; i + 1 < glyphBuffer.size(); ++i) { |
| float middleOfNextGlyph = |
| offsetToMiddleOfAdvanceAtIndex(glyphBuffer, i + 1); |
| float advance = |
| glyphBuffer.advanceAt(i) - middleOfLastGlyph + middleOfNextGlyph; |
| markBuffer.add(glyphBuffer.glyphAt(i) ? markGlyph : spaceGlyph, |
| markFontData, advance); |
| middleOfLastGlyph = middleOfNextGlyph; |
| } |
| markBuffer.add( |
| glyphBuffer.glyphAt(glyphBuffer.size() - 1) ? markGlyph : spaceGlyph, |
| markFontData, 0); |
| |
| drawGlyphBuffer(context, runInfo, markBuffer, startPoint); |
| } |
| |
| float Font::floatWidthForSimpleText( |
| const TextRun& run, |
| HashSet<const SimpleFontData*>* fallbackFonts, |
| IntRectExtent* glyphBounds) const { |
| WidthIterator it(this, run, fallbackFonts, glyphBounds); |
| it.advance(run.length()); |
| |
| if (glyphBounds) { |
| glyphBounds->setTop(floorf(-it.minGlyphBoundingBoxY())); |
| glyphBounds->setBottom(ceilf(it.maxGlyphBoundingBoxY())); |
| glyphBounds->setLeft(floorf(it.firstGlyphOverflow())); |
| glyphBounds->setRight(ceilf(it.lastGlyphOverflow())); |
| } |
| |
| return it.m_runWidthSoFar; |
| } |
| |
| FloatRect Font::pixelSnappedSelectionRect(float fromX, |
| float toX, |
| float y, |
| float height) { |
| // Using roundf() rather than ceilf() for the right edge as a compromise to |
| // ensure correct caret positioning. |
| float roundedX = roundf(fromX); |
| return FloatRect(roundedX, y, roundf(toX - roundedX), height); |
| } |
| |
| FloatRect Font::selectionRectForSimpleText(const TextRun& run, |
| const FloatPoint& point, |
| int h, |
| int from, |
| int to, |
| bool accountForGlyphBounds) const { |
| WidthIterator it(this, run, 0, accountForGlyphBounds); |
| it.advance(from); |
| float fromX = it.m_runWidthSoFar; |
| it.advance(to); |
| float toX = it.m_runWidthSoFar; |
| |
| if (run.rtl()) { |
| it.advance(run.length()); |
| float totalWidth = it.m_runWidthSoFar; |
| float beforeWidth = fromX; |
| float afterWidth = toX; |
| fromX = totalWidth - afterWidth; |
| toX = totalWidth - beforeWidth; |
| } |
| |
| return pixelSnappedSelectionRect( |
| point.x() + fromX, point.x() + toX, |
| accountForGlyphBounds ? it.minGlyphBoundingBoxY() : point.y(), |
| accountForGlyphBounds |
| ? it.maxGlyphBoundingBoxY() - it.minGlyphBoundingBoxY() |
| : h); |
| } |
| |
| int Font::offsetForPositionForSimpleText(const TextRun& run, |
| float x, |
| bool includePartialGlyphs) const { |
| float delta = x; |
| |
| WidthIterator it(this, run); |
| unsigned offset; |
| if (run.rtl()) { |
| delta -= floatWidthForSimpleText(run); |
| while (1) { |
| offset = it.m_currentCharacter; |
| float w; |
| if (!it.advanceOneCharacter(w)) |
| break; |
| delta += w; |
| if (includePartialGlyphs) { |
| if (delta - w / 2 >= 0) |
| break; |
| } else { |
| if (delta >= 0) |
| break; |
| } |
| } |
| } else { |
| while (1) { |
| offset = it.m_currentCharacter; |
| float w; |
| if (!it.advanceOneCharacter(w)) |
| break; |
| delta -= w; |
| if (includePartialGlyphs) { |
| if (delta + w / 2 <= 0) |
| break; |
| } else { |
| if (delta <= 0) |
| break; |
| } |
| } |
| } |
| |
| return offset; |
| } |
| |
| } // namespace blink |
