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| 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 |
| 41 namespace blink { |
| 42 |
| 43 static hb_position_t floatToHarfBuzzPosition(CGFloat value) |
| 44 { |
| 45 return static_cast<hb_position_t>(value * (1 << 16)); |
| 46 } |
| 47 |
| 48 static hb_bool_t getGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unic
ode, 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 |
| 61 static 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, kCTFontHorizontalOrient
ation, &cgGlyph, 0, 1); |
| 66 return floatToHarfBuzzPosition(advance); |
| 67 } |
| 68 |
| 69 static 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 |
| 74 static 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, &cgGl
yph, &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 |
| 88 static 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, getGly
phHorizontalAdvance, 0, 0); |
| 96 hb_font_funcs_set_glyph_h_origin_func(harfBuzzCoreTextFontFuncs, getGlyp
hHorizontalOrigin, 0, 0); |
| 97 hb_font_funcs_set_glyph_extents_func(harfBuzzCoreTextFontFuncs, getGlyph
Extents, 0, 0); |
| 98 hb_font_funcs_make_immutable(harfBuzzCoreTextFontFuncs); |
| 99 } |
| 100 return harfBuzzCoreTextFontFuncs; |
| 101 } |
| 102 |
| 103 static void releaseTableData(void* userData) |
| 104 { |
| 105 CFDataRef cfData = reinterpret_cast<CFDataRef>(userData); |
| 106 CFRelease(cfData); |
| 107 } |
| 108 |
| 109 static hb_blob_t* harfBuzzCoreTextGetTable(hb_face_t* face, hb_tag_t tag, void*
userData) |
| 110 { |
| 111 CGFontRef cgFont = reinterpret_cast<CGFontRef>(userData); |
| 112 if (!cgFont) |
| 113 return 0; |
| 114 CFDataRef cfData = CGFontCopyTableForTag(cgFont, tag); |
| 115 if (!cfData) |
| 116 return 0; |
| 117 |
| 118 const char* data = reinterpret_cast<const char*>(CFDataGetBytePtr(cfData)); |
| 119 const size_t length = CFDataGetLength(cfData); |
| 120 if (!data || !length) |
| 121 return 0; |
| 122 return hb_blob_create(data, length, HB_MEMORY_MODE_READONLY, reinterpret_cas
t<void*>(const_cast<__CFData*>(cfData)), releaseTableData); |
| 123 } |
| 124 |
| 125 hb_face_t* HarfBuzzFace::createFace() |
| 126 { |
| 127 // It seems that CTFontCopyTable of MacOSX10.5 sdk doesn't work for |
| 128 // OpenType layout tables(GDEF, GSUB, GPOS). Use CGFontCopyTableForTag inste
ad. |
| 129 hb_face_t* face = hb_face_create_for_tables(harfBuzzCoreTextGetTable, m_plat
formData->cgFont(), 0); |
| 130 ASSERT(face); |
| 131 return face; |
| 132 } |
| 133 |
| 134 hb_font_t* HarfBuzzFace::createFont() |
| 135 { |
| 136 hb_font_t* font = hb_font_create(m_face); |
| 137 hb_font_set_funcs(font, harfBuzzCoreTextGetFontFuncs(), m_platformData, 0); |
| 138 const float size = m_platformData->m_textSize; |
| 139 hb_font_set_ppem(font, size, size); |
| 140 const int scale = (1 << 16) * static_cast<int>(size); |
| 141 hb_font_set_scale(font, scale, scale); |
| 142 hb_font_make_immutable(font); |
| 143 return font; |
| 144 } |
| 145 |
| 146 } // namespace blink |
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