| /* |
| * Copyright (C) 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #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> |
| |
| // Note: CTFontDescriptorRefs can live forever in caches inside CoreText, so this object can too. |
| @interface WebCascadeList : NSArray { |
| @private |
| WeakPtr<WebCore::FontCascade> _font; |
| UChar32 _character; |
| NSUInteger _count; |
| Vector<RetainPtr<CTFontDescriptorRef>, 16> _fontDescriptors; |
| } |
| |
| - (id)initWithFont:(const WebCore::FontCascade*)font character:(UChar32)character; |
| |
| @end |
| |
| @implementation WebCascadeList |
| |
| - (id)initWithFont:(const WebCore::FontCascade*)font character:(UChar32)character |
| { |
| if (!(self = [super init])) |
| return nil; |
| |
| _font = font->createWeakPtr(); |
| _character = character; |
| |
| // By the time a WebCascadeList is used, the FontCascade has already been asked to realize all of its |
| // Fonts, so this loop does not hit the FontCache. |
| while (!_font->fallbackRangesAt(_count).isNull()) |
| _count++; |
| |
| return self; |
| } |
| |
| - (NSUInteger)count |
| { |
| return _font ? _count : 0; |
| } |
| |
| - (id)objectAtIndex:(NSUInteger)index |
| { |
| if (!_font) |
| return nil; |
| |
| CTFontDescriptorRef fontDescriptor; |
| if (index < _fontDescriptors.size()) { |
| if ((fontDescriptor = _fontDescriptors[index].get())) |
| return (id)fontDescriptor; |
| } else |
| _fontDescriptors.grow(index + 1); |
| |
| const WebCore::Font* font = _font->fallbackRangesAt(index).fontForCharacter(_character); |
| if (!font) |
| font = &_font->fallbackRangesAt(index).fontForFirstRange(); |
| fontDescriptor = CTFontCopyFontDescriptor(font->platformData().ctFont()); |
| _fontDescriptors[index] = adoptCF(fontDescriptor); |
| return (id)fontDescriptor; |
| } |
| |
| @end |
| |
| 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(); |
| |
| RetainPtr<WebCascadeList> cascadeList = adoptNS([[WebCascadeList alloc] initWithFont:&m_font character:baseCharacter]); |
| |
| stringAttributes = adoptCF(CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, font->getCFStringAttributes(m_font.enableKerning(), font->platformData().orientation()))); |
| static const void* attributeKeys[] = { kCTFontCascadeListAttribute }; |
| const void* values[] = { cascadeList.get() }; |
| RetainPtr<CFDictionaryRef> attributes = adoptCF(CFDictionaryCreate(kCFAllocatorDefault, attributeKeys, values, sizeof(attributeKeys) / sizeof(*attributeKeys), &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks)); |
| RetainPtr<CTFontDescriptorRef> fontDescriptor = adoptCF(CTFontDescriptorCreateWithAttributes(attributes.get())); |
| RetainPtr<CTFontRef> fontWithCascadeList = adoptCF(CTFontCreateCopyWithAttributes(font->platformData().ctFont(), m_font.pixelSize(), 0, fontDescriptor.get())); |
| CFDictionarySetValue(const_cast<CFMutableDictionaryRef>(stringAttributes.get()), kCTFontAttributeName, fontWithCascadeList.get()); |
| } else |
| stringAttributes = font->getCFStringAttributes(m_font.enableKerning(), font->platformData().orientation()); |
| |
| RetainPtr<CTLineRef> line; |
| |
| if (!m_mayUseNaturalWritingDirection || m_run.directionalOverride()) { |
| static const void* optionKeys[] = { kCTTypesetterOptionForcedEmbeddingLevel }; |
| const short ltrForcedEmbeddingLevelValue = 0; |
| const short rtlForcedEmbeddingLevelValue = 1; |
| static const void* ltrOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, <rForcedEmbeddingLevelValue) }; |
| static const void* rtlOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &rtlForcedEmbeddingLevelValue) }; |
| 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() }; |
| RetainPtr<CTTypesetterRef> typesetter = adoptCF(CTTypesetterCreateWithUniCharProviderAndOptions(&provideStringAndAttributes, 0, &info, m_run.ltr() ? ltrTypesetterOptions : rtlTypesetterOptions)); |
| |
| line = adoptCF(CTTypesetterCreateLine(typesetter.get(), CFRangeMake(0, 0))); |
| } else { |
| ProviderInfo info = { cp, length, stringAttributes.get() }; |
| |
| line = adoptCF(CTLineCreateWithUniCharProvider(&provideStringAndAttributes, nullptr, &info)); |
| } |
| |
| m_coreTextLines.append(line.get()); |
| |
| CFArrayRef runArray = CTLineGetGlyphRuns(line.get()); |
| |
| 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) { |
| 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 |