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      1 /*
      2  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 #include "ComplexTextController.h"
     27 #include "TextRun.h"
     28 #include "WebCoreSystemInterface.h"
     29 
     30 #if USE(CORE_TEXT)
     31 
     32 #include "Font.h"
     33 
     34 #if defined(BUILDING_ON_LEOPARD)
     35 // The following symbols are SPI in 10.5.
     36 extern "C" {
     37 void CTRunGetAdvances(CTRunRef run, CFRange range, CGSize buffer[]);
     38 const CGSize* CTRunGetAdvancesPtr(CTRunRef run);
     39 extern const CFStringRef kCTTypesetterOptionForcedEmbeddingLevel;
     40 }
     41 #endif
     42 
     43 namespace WebCore {
     44 
     45 ComplexTextController::ComplexTextRun::ComplexTextRun(CTRunRef ctRun, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, CFRange runRange)
     46     : m_fontData(fontData)
     47     , m_characters(characters)
     48     , m_stringLocation(stringLocation)
     49     , m_stringLength(stringLength)
     50     , m_indexEnd(runRange.location + runRange.length)
     51     , m_isMonotonic(true)
     52 {
     53     m_glyphCount = CTRunGetGlyphCount(ctRun);
     54     m_coreTextIndices = CTRunGetStringIndicesPtr(ctRun);
     55     if (!m_coreTextIndices) {
     56         m_coreTextIndicesVector.grow(m_glyphCount);
     57         CTRunGetStringIndices(ctRun, CFRangeMake(0, 0), m_coreTextIndicesVector.data());
     58         m_coreTextIndices = m_coreTextIndicesVector.data();
     59     }
     60 
     61     m_glyphs = CTRunGetGlyphsPtr(ctRun);
     62     if (!m_glyphs) {
     63         m_glyphsVector.grow(m_glyphCount);
     64         CTRunGetGlyphs(ctRun, CFRangeMake(0, 0), m_glyphsVector.data());
     65         m_glyphs = m_glyphsVector.data();
     66     }
     67 
     68     m_advances = CTRunGetAdvancesPtr(ctRun);
     69     if (!m_advances) {
     70         m_advancesVector.grow(m_glyphCount);
     71         CTRunGetAdvances(ctRun, CFRangeMake(0, 0), m_advancesVector.data());
     72         m_advances = m_advancesVector.data();
     73     }
     74 }
     75 
     76 // Missing glyphs run constructor. Core Text will not generate a run of missing glyphs, instead falling back on
     77 // glyphs from LastResort. We want to use the primary font's missing glyph in order to match the fast text code path.
     78 void ComplexTextController::ComplexTextRun::createTextRunFromFontDataCoreText(bool ltr)
     79 {
     80     m_coreTextIndicesVector.reserveInitialCapacity(m_stringLength);
     81     unsigned r = 0;
     82     while (r < m_stringLength) {
     83         m_coreTextIndicesVector.uncheckedAppend(r);
     84         if (U_IS_SURROGATE(m_characters[r])) {
     85             ASSERT(r + 1 < m_stringLength);
     86             ASSERT(U_IS_SURROGATE_LEAD(m_characters[r]));
     87             ASSERT(U_IS_TRAIL(m_characters[r + 1]));
     88             r += 2;
     89         } else
     90             r++;
     91     }
     92     m_glyphCount = m_coreTextIndicesVector.size();
     93     if (!ltr) {
     94         for (unsigned r = 0, end = m_glyphCount - 1; r < m_glyphCount / 2; ++r, --end)
     95             std::swap(m_coreTextIndicesVector[r], m_coreTextIndicesVector[end]);
     96     }
     97     m_coreTextIndices = m_coreTextIndicesVector.data();
     98 
     99     // Synthesize a run of missing glyphs.
    100     m_glyphsVector.fill(0, m_glyphCount);
    101     m_glyphs = m_glyphsVector.data();
    102     m_advancesVector.fill(CGSizeMake(m_fontData->widthForGlyph(0), 0), m_glyphCount);
    103     m_advances = m_advancesVector.data();
    104 }
    105 
    106 struct ProviderInfo {
    107     const UChar* cp;
    108     unsigned length;
    109     CFDictionaryRef attributes;
    110 };
    111 
    112 static const UniChar* provideStringAndAttributes(CFIndex stringIndex, CFIndex* charCount, CFDictionaryRef* attributes, void* refCon)
    113 {
    114     ProviderInfo* info = static_cast<struct ProviderInfo*>(refCon);
    115     if (stringIndex < 0 || static_cast<unsigned>(stringIndex) >= info->length)
    116         return 0;
    117 
    118     *charCount = info->length - stringIndex;
    119     *attributes = info->attributes;
    120     return info->cp + stringIndex;
    121 }
    122 
    123 void ComplexTextController::collectComplexTextRunsForCharactersCoreText(const UChar* cp, unsigned length, unsigned stringLocation, const SimpleFontData* fontData)
    124 {
    125     if (!fontData) {
    126         // Create a run of missing glyphs from the primary font.
    127         m_complexTextRuns.append(ComplexTextRun::create(m_font.primaryFont(), cp, stringLocation, length, m_run.ltr()));
    128         return;
    129     }
    130 
    131     if (m_fallbackFonts && fontData != m_font.primaryFont())
    132         m_fallbackFonts->add(fontData);
    133 
    134     RetainPtr<CTLineRef> line;
    135 
    136     if (!m_mayUseNaturalWritingDirection || m_run.directionalOverride()) {
    137         static const void* optionKeys[] = { kCTTypesetterOptionForcedEmbeddingLevel };
    138         const short ltrForcedEmbeddingLevelValue = 0;
    139         const short rtlForcedEmbeddingLevelValue = 1;
    140         static const void* ltrOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &ltrForcedEmbeddingLevelValue) };
    141         static const void* rtlOptionValues[] = { CFNumberCreate(kCFAllocatorDefault, kCFNumberShortType, &rtlForcedEmbeddingLevelValue) };
    142         static CFDictionaryRef ltrTypesetterOptions = CFDictionaryCreate(kCFAllocatorDefault, optionKeys, ltrOptionValues, WTF_ARRAY_LENGTH(optionKeys), &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
    143         static CFDictionaryRef rtlTypesetterOptions = CFDictionaryCreate(kCFAllocatorDefault, optionKeys, rtlOptionValues, WTF_ARRAY_LENGTH(optionKeys), &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
    144 
    145 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) && !defined(BUILDING_ON_SNOW_LEOPARD)
    146         ProviderInfo info = { cp, length, fontData->getCFStringAttributes(m_font.typesettingFeatures(), fontData->platformData().orientation()) };
    147         RetainPtr<CTTypesetterRef> typesetter(AdoptCF, wkCreateCTTypesetterWithUniCharProviderAndOptions(&provideStringAndAttributes, 0, &info, m_run.ltr() ? ltrTypesetterOptions : rtlTypesetterOptions));
    148 #else
    149         RetainPtr<CFStringRef> string(AdoptCF, CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault, cp, length, kCFAllocatorNull));
    150         RetainPtr<CFAttributedStringRef> attributedString(AdoptCF, CFAttributedStringCreate(kCFAllocatorDefault, string.get(), fontData->getCFStringAttributes(m_font.typesettingFeatures(), fontData->platformData().orientation())));
    151         RetainPtr<CTTypesetterRef> typesetter(AdoptCF, CTTypesetterCreateWithAttributedStringAndOptions(attributedString.get(), m_run.ltr() ? ltrTypesetterOptions : rtlTypesetterOptions));
    152 #endif
    153 
    154         line.adoptCF(CTTypesetterCreateLine(typesetter.get(), CFRangeMake(0, 0)));
    155     } else {
    156         ProviderInfo info = { cp, length, fontData->getCFStringAttributes(m_font.typesettingFeatures(), fontData->platformData().orientation()) };
    157 
    158         line.adoptCF(wkCreateCTLineWithUniCharProvider(&provideStringAndAttributes, 0, &info));
    159     }
    160 
    161     m_coreTextLines.append(line.get());
    162 
    163     CFArrayRef runArray = CTLineGetGlyphRuns(line.get());
    164 
    165     CFIndex runCount = CFArrayGetCount(runArray);
    166 
    167     for (CFIndex r = 0; r < runCount; r++) {
    168         CTRunRef ctRun = static_cast<CTRunRef>(CFArrayGetValueAtIndex(runArray, r));
    169         ASSERT(CFGetTypeID(ctRun) == CTRunGetTypeID());
    170         CFRange runRange = CTRunGetStringRange(ctRun);
    171         m_complexTextRuns.append(ComplexTextRun::create(ctRun, fontData, cp, stringLocation, length, runRange));
    172     }
    173 }
    174 
    175 } // namespace WebCore
    176 
    177 #endif // USE(CORE_TEXT)
    178