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flutter_flutter/sky/engine/platform/fonts/Font.cpp
Michael Goderbauer 08961f8ec5 Format all c-like sources with clang-format (#4088) 
* format

* license script adaptions

* updated licenses

* review comments
2017-09-12 15:36:20 -07:00

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/*
* 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
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