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 "platform/fonts/harfbuzz/HarfBuzzFace.h" 33 34#include "platform/fonts/FontPlatformData.h" 35#include "platform/fonts/SimpleFontData.h" 36#include "platform/fonts/harfbuzz/HarfBuzzShaper.h" 37 38#include <ApplicationServices/ApplicationServices.h> 39#include "hb.h" 40 41namespace WebCore { 42 43static hb_position_t floatToHarfBuzzPosition(CGFloat value) 44{ 45 return static_cast<hb_position_t>(value * (1 << 16)); 46} 47 48static hb_bool_t getGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData) 49{ 50 CTFontRef ctFont = reinterpret_cast<FontPlatformData*>(fontData)->ctFont(); 51 UniChar characters[4]; 52 CGGlyph cgGlyphs[4]; 53 size_t length = 0; 54 U16_APPEND_UNSAFE(characters, length, unicode); 55 if (!CTFontGetGlyphsForCharacters(ctFont, characters, cgGlyphs, length)) 56 return false; 57 *glyph = cgGlyphs[0]; 58 return true; 59} 60 61static hb_position_t getGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData) 62{ 63 CTFontRef ctFont = reinterpret_cast<FontPlatformData*>(fontData)->ctFont(); 64 CGGlyph cgGlyph = glyph; 65 CGFloat advance = CTFontGetAdvancesForGlyphs(ctFont, kCTFontHorizontalOrientation, &cgGlyph, 0, 1); 66 return floatToHarfBuzzPosition(advance); 67} 68 69static hb_bool_t getGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData) 70{ 71 return true; 72} 73 74static hb_bool_t getGlyphExtents(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_glyph_extents_t* extents, void* userData) 75{ 76 CTFontRef ctFont = reinterpret_cast<FontPlatformData*>(fontData)->ctFont(); 77 CGRect cgRect; 78 CGGlyph cgGlyph = glyph; 79 if (CTFontGetBoundingRectsForGlyphs(ctFont, kCTFontDefaultOrientation, &cgGlyph, &cgRect, 1) == CGRectNull) 80 return false; 81 extents->x_bearing = floatToHarfBuzzPosition(cgRect.origin.x); 82 extents->y_bearing = -floatToHarfBuzzPosition(cgRect.origin.y); 83 extents->width = floatToHarfBuzzPosition(cgRect.size.width); 84 extents->height = floatToHarfBuzzPosition(cgRect.size.height); 85 return true; 86} 87 88static hb_font_funcs_t* harfBuzzCoreTextGetFontFuncs() 89{ 90 static hb_font_funcs_t* harfBuzzCoreTextFontFuncs = 0; 91 92 if (!harfBuzzCoreTextFontFuncs) { 93 harfBuzzCoreTextFontFuncs = hb_font_funcs_create(); 94 hb_font_funcs_set_glyph_func(harfBuzzCoreTextFontFuncs, getGlyph, 0, 0); 95 hb_font_funcs_set_glyph_h_advance_func(harfBuzzCoreTextFontFuncs, getGlyphHorizontalAdvance, 0, 0); 96 hb_font_funcs_set_glyph_h_origin_func(harfBuzzCoreTextFontFuncs, getGlyphHorizontalOrigin, 0, 0); 97 hb_font_funcs_set_glyph_extents_func(harfBuzzCoreTextFontFuncs, getGlyphExtents, 0, 0); 98 hb_font_funcs_make_immutable(harfBuzzCoreTextFontFuncs); 99 } 100 return harfBuzzCoreTextFontFuncs; 101} 102 103static void releaseTableData(void* userData) 104{ 105 CFDataRef cfData = reinterpret_cast<CFDataRef>(userData); 106 CFRelease(cfData); 107} 108 109static hb_blob_t* harfBuzzCoreTextGetTable(hb_face_t* face, hb_tag_t tag, void* userData) 110{ 111 CGFontRef cgFont = reinterpret_cast<CGFontRef>(userData); 112 CFDataRef cfData = CGFontCopyTableForTag(cgFont, tag); 113 if (!cfData) 114 return 0; 115 116 const char* data = reinterpret_cast<const char*>(CFDataGetBytePtr(cfData)); 117 const size_t length = CFDataGetLength(cfData); 118 if (!data || !length) 119 return 0; 120 return hb_blob_create(data, length, HB_MEMORY_MODE_READONLY, reinterpret_cast<void*>(const_cast<__CFData*>(cfData)), releaseTableData); 121} 122 123hb_face_t* HarfBuzzFace::createFace() 124{ 125 // It seems that CTFontCopyTable of MacOSX10.5 sdk doesn't work for 126 // OpenType layout tables(GDEF, GSUB, GPOS). Use CGFontCopyTableForTag instead. 127 hb_face_t* face = hb_face_create_for_tables(harfBuzzCoreTextGetTable, m_platformData->cgFont(), 0); 128 ASSERT(face); 129 return face; 130} 131 132hb_font_t* HarfBuzzFace::createFont() 133{ 134 hb_font_t* font = hb_font_create(m_face); 135 hb_font_set_funcs(font, harfBuzzCoreTextGetFontFuncs(), m_platformData, 0); 136 const float size = m_platformData->m_size; 137 hb_font_set_ppem(font, size, size); 138 const int scale = (1 << 16) * static_cast<int>(size); 139 hb_font_set_scale(font, scale, scale); 140 hb_font_make_immutable(font); 141 return font; 142} 143 144} // namespace WebCore 145