1/* 2 * Copyright (c) 2012 Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "config.h" 32#include "HarfBuzzFace.h" 33 34#include "FontPlatformData.h" 35#include "hb-ot.h" 36#include "hb.h" 37 38namespace WebCore { 39 40const hb_tag_t HarfBuzzFace::vertTag = HB_TAG('v', 'e', 'r', 't'); 41const hb_tag_t HarfBuzzFace::vrt2Tag = HB_TAG('v', 'r', 't', '2'); 42const hb_tag_t HarfBuzzFace::kernTag = HB_TAG('k', 'e', 'r', 'n'); 43 44// Though we have FontCache class, which provides the cache mechanism for 45// WebKit's font objects, we also need additional caching layer for HarfBuzz 46// to reduce the memory consumption because hb_face_t should be associated with 47// underling font data (e.g. CTFontRef, FTFace). 48 49class FaceCacheEntry : public RefCounted<FaceCacheEntry> { 50public: 51 static PassRefPtr<FaceCacheEntry> create(hb_face_t* face) 52 { 53 ASSERT(face); 54 return adoptRef(new FaceCacheEntry(face)); 55 } 56 ~FaceCacheEntry() 57 { 58 hb_face_destroy(m_face); 59 } 60 61 hb_face_t* face() { return m_face; } 62 HashMap<uint32_t, uint16_t>* glyphCache() { return &m_glyphCache; } 63 64private: 65 explicit FaceCacheEntry(hb_face_t* face) 66 : m_face(face) 67 { } 68 69 hb_face_t* m_face; 70 HashMap<uint32_t, uint16_t> m_glyphCache; 71}; 72 73typedef HashMap<uint64_t, RefPtr<FaceCacheEntry>, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t> > HarfBuzzFaceCache; 74 75static HarfBuzzFaceCache* harfBuzzFaceCache() 76{ 77 DEPRECATED_DEFINE_STATIC_LOCAL(HarfBuzzFaceCache, s_harfBuzzFaceCache, ()); 78 return &s_harfBuzzFaceCache; 79} 80 81HarfBuzzFace::HarfBuzzFace(FontPlatformData* platformData, uint64_t uniqueID) 82 : m_platformData(platformData) 83 , m_uniqueID(uniqueID) 84 , m_scriptForVerticalText(HB_SCRIPT_INVALID) 85{ 86 HarfBuzzFaceCache::AddResult result = harfBuzzFaceCache()->add(m_uniqueID, nullptr); 87 if (result.isNewEntry) 88 result.iterator->value = FaceCacheEntry::create(createFace()); 89 result.iterator->value->ref(); 90 m_face = result.iterator->value->face(); 91 m_glyphCacheForFaceCacheEntry = result.iterator->value->glyphCache(); 92} 93 94HarfBuzzFace::~HarfBuzzFace() 95{ 96 HarfBuzzFaceCache::iterator result = harfBuzzFaceCache()->find(m_uniqueID); 97 ASSERT(result != harfBuzzFaceCache()->end()); 98 ASSERT(result.get()->value->refCount() > 1); 99 result.get()->value->deref(); 100 if (result.get()->value->refCount() == 1) 101 harfBuzzFaceCache()->remove(m_uniqueID); 102} 103 104static hb_script_t findScriptForVerticalGlyphSubstitution(hb_face_t* face) 105{ 106 static const unsigned maxCount = 32; 107 108 unsigned scriptCount = maxCount; 109 hb_tag_t scriptTags[maxCount]; 110 hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, 0, &scriptCount, scriptTags); 111 for (unsigned scriptIndex = 0; scriptIndex < scriptCount; ++scriptIndex) { 112 unsigned languageCount = maxCount; 113 hb_tag_t languageTags[maxCount]; 114 hb_ot_layout_script_get_language_tags(face, HB_OT_TAG_GSUB, scriptIndex, 0, &languageCount, languageTags); 115 for (unsigned languageIndex = 0; languageIndex < languageCount; ++languageIndex) { 116 unsigned featureIndex; 117 if (hb_ot_layout_language_find_feature(face, HB_OT_TAG_GSUB, scriptIndex, languageIndex, HarfBuzzFace::vertTag, &featureIndex) 118 || hb_ot_layout_language_find_feature(face, HB_OT_TAG_GSUB, scriptIndex, languageIndex, HarfBuzzFace::vrt2Tag, &featureIndex)) 119 return hb_ot_tag_to_script(scriptTags[scriptIndex]); 120 } 121 } 122 return HB_SCRIPT_INVALID; 123} 124 125void HarfBuzzFace::setScriptForVerticalGlyphSubstitution(hb_buffer_t* buffer) 126{ 127 if (m_scriptForVerticalText == HB_SCRIPT_INVALID) 128 m_scriptForVerticalText = findScriptForVerticalGlyphSubstitution(m_face); 129 hb_buffer_set_script(buffer, m_scriptForVerticalText); 130} 131 132} // namespace WebCore 133