ComplexTextControllerCoreText.mm [plain text]
/*
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#include "config.h"
#include "ComplexTextController.h"
#include "FontCache.h"
#include "FontCascade.h"
#include <pal/spi/cocoa/CoreTextSPI.h>
#include <wtf/SoftLinking.h>
#include <wtf/WeakPtr.h>
#include <CoreText/CoreText.h>
namespace WebCore {
ComplexTextController::ComplexTextRun::ComplexTextRun(CTRunRef ctRun, const Font& font, const UChar* characters, unsigned stringLocation, unsigned stringLength, unsigned indexBegin, unsigned indexEnd)
: m_initialAdvance(CTRunGetInitialAdvance(ctRun))
, m_font(font)
, m_characters(characters)
, m_stringLength(stringLength)
, m_indexBegin(indexBegin)
, m_indexEnd(indexEnd)
, m_glyphCount(CTRunGetGlyphCount(ctRun))
, m_stringLocation(stringLocation)
, m_isLTR(!(CTRunGetStatus(ctRun) & kCTRunStatusRightToLeft))
{
const CFIndex* coreTextIndicesPtr = CTRunGetStringIndicesPtr(ctRun);
Vector<CFIndex> coreTextIndices;
if (!coreTextIndicesPtr) {
coreTextIndices.grow(m_glyphCount);
CTRunGetStringIndices(ctRun, CFRangeMake(0, 0), coreTextIndices.data());
coreTextIndicesPtr = coreTextIndices.data();
}
m_coreTextIndices.reserveInitialCapacity(m_glyphCount);
for (unsigned i = 0; i < m_glyphCount; ++i)
m_coreTextIndices.uncheckedAppend(coreTextIndicesPtr[i]);
const CGGlyph* glyphsPtr = CTRunGetGlyphsPtr(ctRun);
Vector<CGGlyph> glyphs;
if (!glyphsPtr) {
glyphs.grow(m_glyphCount);
CTRunGetGlyphs(ctRun, CFRangeMake(0, 0), glyphs.data());
glyphsPtr = glyphs.data();
}
m_glyphs.reserveInitialCapacity(m_glyphCount);
for (unsigned i = 0; i < m_glyphCount; ++i)
m_glyphs.uncheckedAppend(glyphsPtr[i]);
if (CTRunGetStatus(ctRun) & kCTRunStatusHasOrigins) {
Vector<CGSize> baseAdvances(m_glyphCount);
Vector<CGPoint> glyphOrigins(m_glyphCount);
CTRunGetBaseAdvancesAndOrigins(ctRun, CFRangeMake(0, 0), baseAdvances.data(), glyphOrigins.data());
m_baseAdvances.reserveInitialCapacity(m_glyphCount);
m_glyphOrigins.reserveInitialCapacity(m_glyphCount);
for (unsigned i = 0; i < m_glyphCount; ++i) {
m_baseAdvances.uncheckedAppend(baseAdvances[i]);
m_glyphOrigins.uncheckedAppend(glyphOrigins[i]);
}
} else {
const CGSize* baseAdvances = CTRunGetAdvancesPtr(ctRun);
Vector<CGSize> baseAdvancesVector;
if (!baseAdvances) {
baseAdvancesVector.grow(m_glyphCount);
CTRunGetAdvances(ctRun, CFRangeMake(0, 0), baseAdvancesVector.data());
baseAdvances = baseAdvancesVector.data();
}
m_baseAdvances.reserveInitialCapacity(m_glyphCount);
for (unsigned i = 0; i < m_glyphCount; ++i)
m_baseAdvances.uncheckedAppend(baseAdvances[i]);
}
}
struct ProviderInfo {
const UChar* cp;
unsigned length;
CFDictionaryRef attributes;
};
static const UniChar* provideStringAndAttributes(CFIndex stringIndex, CFIndex* charCount, CFDictionaryRef* attributes, void* refCon)
{
ProviderInfo* info = static_cast<struct ProviderInfo*>(refCon);
if (stringIndex < 0 || static_cast<unsigned>(stringIndex) >= info->length)
return 0;
*charCount = info->length - stringIndex;
*attributes = info->attributes;
return info->cp + stringIndex;
}
static inline bool safeCFEqual(CFTypeRef a, CFTypeRef b)
{
return (!a && !b) || (a && b && CFEqual(a, b));
}
void ComplexTextController::collectComplexTextRunsForCharacters(const UChar* cp, unsigned length, unsigned stringLocation, const Font* font)
{
if (!font) {
// Create a run of missing glyphs from the primary font.
m_complexTextRuns.append(ComplexTextRun::create(m_font.primaryFont(), cp, stringLocation, length, 0, length, m_run.ltr()));
return;
}
bool isSystemFallback = false;
UChar32 baseCharacter = 0;
RetainPtr<CFDictionaryRef> stringAttributes;
if (font == Font::systemFallback()) {
// FIXME: This code path does not support small caps.
isSystemFallback = true;
U16_GET(cp, 0, 0, length, baseCharacter);
font = m_font.fallbackRangesAt(0).fontForCharacter(baseCharacter);
if (!font)
font = &m_font.fallbackRangesAt(0).fontForFirstRange();
stringAttributes = adoptCF(CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, font->getCFStringAttributes(m_font.enableKerning(), font->platformData().orientation())));
// We don't know which font should be used to render this grapheme cluster, so enable CoreText's fallback mechanism by using the CTFont which doesn't have CoreText's fallback disabled.
CFDictionarySetValue(const_cast<CFMutableDictionaryRef>(stringAttributes.get()), kCTFontAttributeName, font->platformData().font());
} else
stringAttributes = font->getCFStringAttributes(m_font.enableKerning(), font->platformData().orientation());
RetainPtr<CTLineRef> line;
if (!m_mayUseNaturalWritingDirection || m_run.directionalOverride()) {
const short ltrForcedEmbeddingLevelValue = 0;
const short rtlForcedEmbeddingLevelValue = 1;
#if (PLATFORM(MAC) && __MAC_OS_X_VERSION_MIN_REQUIRED == 101400) || (PLATFORM(IOS_FAMILY) && __IPHONE_OS_VERSION_MIN_REQUIRED == 120000)
static const void* optionKeys[] = { kCTTypesetterOptionForcedEmbeddingLevel, kCTTypesetterOptionAllowUnboundedLayout };
static const void* ltrOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, <rForcedEmbeddingLevelValue), kCFBooleanTrue };
static const void* rtlOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &rtlForcedEmbeddingLevelValue), kCFBooleanTrue };
#else
static const void* optionKeys[] = { kCTTypesetterOptionForcedEmbeddingLevel };
static const void* ltrOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, <rForcedEmbeddingLevelValue) };
static const void* rtlOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &rtlForcedEmbeddingLevelValue) };
#endif
static CFDictionaryRef ltrTypesetterOptions = CFDictionaryCreate(kCFAllocatorDefault, optionKeys, ltrOptionValues, WTF_ARRAY_LENGTH(optionKeys), &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
static CFDictionaryRef rtlTypesetterOptions = CFDictionaryCreate(kCFAllocatorDefault, optionKeys, rtlOptionValues, WTF_ARRAY_LENGTH(optionKeys), &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
ProviderInfo info = { cp, length, stringAttributes.get() };
// FIXME: Some SDKs complain that the second parameter below cannot be null.
IGNORE_NULL_CHECK_WARNINGS_BEGIN
RetainPtr<CTTypesetterRef> typesetter = adoptCF(CTTypesetterCreateWithUniCharProviderAndOptions(&provideStringAndAttributes, 0, &info, m_run.ltr() ? ltrTypesetterOptions : rtlTypesetterOptions));
IGNORE_NULL_CHECK_WARNINGS_END
if (!typesetter)
return;
line = adoptCF(CTTypesetterCreateLine(typesetter.get(), CFRangeMake(0, 0)));
} else {
ProviderInfo info = { cp, length, stringAttributes.get() };
line = adoptCF(CTLineCreateWithUniCharProvider(&provideStringAndAttributes, nullptr, &info));
}
if (!line)
return;
m_coreTextLines.append(line.get());
CFArrayRef runArray = CTLineGetGlyphRuns(line.get());
if (!runArray)
return;
CFIndex runCount = CFArrayGetCount(runArray);
for (CFIndex r = 0; r < runCount; r++) {
CTRunRef ctRun = static_cast<CTRunRef>(CFArrayGetValueAtIndex(runArray, m_run.ltr() ? r : runCount - 1 - r));
ASSERT(CFGetTypeID(ctRun) == CTRunGetTypeID());
CFRange runRange = CTRunGetStringRange(ctRun);
const Font* runFont = font;
// If isSystemFallback is false, it means we disabled CoreText's font fallback mechanism, which means all the runs must use this exact font.
// Therefore, we only need to inspect which font was actually used if isSystemFallback is true.
if (isSystemFallback) {
CFDictionaryRef runAttributes = CTRunGetAttributes(ctRun);
CTFontRef runCTFont = static_cast<CTFontRef>(CFDictionaryGetValue(runAttributes, kCTFontAttributeName));
ASSERT(runCTFont && CFGetTypeID(runCTFont) == CTFontGetTypeID());
RetainPtr<CFTypeRef> runFontEqualityObject = FontPlatformData::objectForEqualityCheck(runCTFont);
if (!safeCFEqual(runFontEqualityObject.get(), font->platformData().objectForEqualityCheck().get())) {
// Begin trying to see if runFont matches any of the fonts in the fallback list.
for (unsigned i = 0; !m_font.fallbackRangesAt(i).isNull(); ++i) {
runFont = m_font.fallbackRangesAt(i).fontForCharacter(baseCharacter);
if (!runFont)
continue;
if (safeCFEqual(runFont->platformData().objectForEqualityCheck().get(), runFontEqualityObject.get()))
break;
runFont = nullptr;
}
if (!runFont) {
RetainPtr<CFStringRef> fontName = adoptCF(CTFontCopyPostScriptName(runCTFont));
if (CFEqual(fontName.get(), CFSTR("LastResort"))) {
m_complexTextRuns.append(ComplexTextRun::create(m_font.primaryFont(), cp, stringLocation, length, runRange.location, runRange.location + runRange.length, m_run.ltr()));
continue;
}
FontPlatformData runFontPlatformData(runCTFont, CTFontGetSize(runCTFont));
runFont = FontCache::singleton().fontForPlatformData(runFontPlatformData).ptr();
}
if (m_fallbackFonts && runFont != &m_font.primaryFont())
m_fallbackFonts->add(runFont);
}
}
if (m_fallbackFonts && runFont != &m_font.primaryFont())
m_fallbackFonts->add(font);
m_complexTextRuns.append(ComplexTextRun::create(ctRun, *runFont, cp, stringLocation, length, runRange.location, runRange.location + runRange.length));
}
}
} // namespace WebCore