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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ui/gfx/render_text_harfbuzz.h" | 5 #include "ui/gfx/render_text_harfbuzz.h" |
6 | 6 |
7 #include <map> | 7 #include <map> |
8 | 8 |
9 #include "base/i18n/break_iterator.h" | 9 #include "base/i18n/break_iterator.h" |
10 #include "base/i18n/char_iterator.h" | 10 #include "base/i18n/char_iterator.h" |
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119 hb_bool_t GetGlyphHorizontalOrigin(hb_font_t* font, | 119 hb_bool_t GetGlyphHorizontalOrigin(hb_font_t* font, |
120 void* data, | 120 void* data, |
121 hb_codepoint_t glyph, | 121 hb_codepoint_t glyph, |
122 hb_position_t* x, | 122 hb_position_t* x, |
123 hb_position_t* y, | 123 hb_position_t* y, |
124 void* user_data) { | 124 void* user_data) { |
125 // Just return true, like the HarfBuzz-FreeType implementation. | 125 // Just return true, like the HarfBuzz-FreeType implementation. |
126 return true; | 126 return true; |
127 } | 127 } |
128 | 128 |
129 hb_position_t GetGlyphKerning(FontData* font_data, | |
130 hb_codepoint_t first_glyph, | |
131 hb_codepoint_t second_glyph) { | |
132 SkTypeface* typeface = font_data->paint_.getTypeface(); | |
133 const uint16_t glyphs[2] = { first_glyph, second_glyph }; | |
134 int32_t kerning_adjustments[1] = { 0 }; | |
135 | |
136 if (!typeface->getKerningPairAdjustments(glyphs, 2, kerning_adjustments)) | |
137 return 0; | |
138 | |
139 SkScalar upm = SkIntToScalar(typeface->getUnitsPerEm()); | |
140 SkScalar size = font_data->paint_.getTextSize(); | |
141 return SkiaScalarToHarfBuzzPosition( | |
142 SkScalarMulDiv(SkIntToScalar(kerning_adjustments[0]), size, upm)); | |
143 } | |
144 | |
145 hb_position_t GetGlyphHorizontalKerning(hb_font_t* font, | |
146 void* data, | |
147 hb_codepoint_t left_glyph, | |
148 hb_codepoint_t right_glyph, | |
149 void* user_data) { | |
150 FontData* font_data = reinterpret_cast<FontData*>(data); | |
151 if (font_data->paint_.isVerticalText()) { | |
152 // We don't support cross-stream kerning. | |
153 return 0; | |
154 } | |
155 | |
156 return GetGlyphKerning(font_data, left_glyph, right_glyph); | |
157 } | |
158 | |
159 hb_position_t GetGlyphVerticalKerning(hb_font_t* font, | |
160 void* data, | |
161 hb_codepoint_t top_glyph, | |
162 hb_codepoint_t bottom_glyph, | |
163 void* user_data) { | |
164 FontData* font_data = reinterpret_cast<FontData*>(data); | |
165 if (!font_data->paint_.isVerticalText()) { | |
166 // We don't support cross-stream kerning. | |
167 return 0; | |
168 } | |
169 | |
170 return GetGlyphKerning(font_data, top_glyph, bottom_glyph); | |
171 } | |
172 | |
173 // Writes the |extents| of |glyph|. | 129 // Writes the |extents| of |glyph|. |
174 hb_bool_t GetGlyphExtents(hb_font_t* font, | 130 hb_bool_t GetGlyphExtents(hb_font_t* font, |
175 void* data, | 131 void* data, |
176 hb_codepoint_t glyph, | 132 hb_codepoint_t glyph, |
177 hb_glyph_extents_t* extents, | 133 hb_glyph_extents_t* extents, |
178 void* user_data) { | 134 void* user_data) { |
179 FontData* font_data = reinterpret_cast<FontData*>(data); | 135 FontData* font_data = reinterpret_cast<FontData*>(data); |
180 | 136 |
181 GetGlyphWidthAndExtents(&font_data->paint_, glyph, 0, extents); | 137 GetGlyphWidthAndExtents(&font_data->paint_, glyph, 0, extents); |
182 return true; | 138 return true; |
183 } | 139 } |
184 | 140 |
185 // Returns a HarfBuzz font data provider that uses Skia. | 141 // Returns a HarfBuzz font data provider that uses Skia. |
186 hb_font_funcs_t* GetFontFuncs() { | 142 hb_font_funcs_t* GetFontFuncs() { |
187 static hb_font_funcs_t* font_funcs = 0; | 143 static hb_font_funcs_t* font_funcs = 0; |
188 | 144 |
189 // We don't set callback functions which we can't support. | 145 // We don't set callback functions which we can't support. |
190 // HarfBuzz will use the fallback implementation if they aren't set. | 146 // HarfBuzz will use the fallback implementation if they aren't set. |
| 147 // TODO(ckocagil): Merge Blink's kerning funcs. |
191 if (!font_funcs) { | 148 if (!font_funcs) { |
192 // The object created by |hb_font_funcs_create()| below lives indefinitely | 149 // The object created by |hb_font_funcs_create()| below lives indefinitely |
193 // and is intentionally leaked. | 150 // and is intentionally leaked. |
194 font_funcs = hb_font_funcs_create(); | 151 font_funcs = hb_font_funcs_create(); |
195 hb_font_funcs_set_glyph_func(font_funcs, GetGlyph, 0, 0); | 152 hb_font_funcs_set_glyph_func(font_funcs, GetGlyph, 0, 0); |
196 hb_font_funcs_set_glyph_h_advance_func( | 153 hb_font_funcs_set_glyph_h_advance_func( |
197 font_funcs, GetGlyphHorizontalAdvance, 0, 0); | 154 font_funcs, GetGlyphHorizontalAdvance, 0, 0); |
198 hb_font_funcs_set_glyph_h_kerning_func( | |
199 font_funcs, GetGlyphHorizontalKerning, 0, 0); | |
200 hb_font_funcs_set_glyph_h_origin_func( | 155 hb_font_funcs_set_glyph_h_origin_func( |
201 font_funcs, GetGlyphHorizontalOrigin, 0, 0); | 156 font_funcs, GetGlyphHorizontalOrigin, 0, 0); |
202 hb_font_funcs_set_glyph_v_kerning_func( | |
203 font_funcs, GetGlyphVerticalKerning, 0, 0); | |
204 hb_font_funcs_set_glyph_extents_func( | 157 hb_font_funcs_set_glyph_extents_func( |
205 font_funcs, GetGlyphExtents, 0, 0); | 158 font_funcs, GetGlyphExtents, 0, 0); |
206 hb_font_funcs_make_immutable(font_funcs); | 159 hb_font_funcs_make_immutable(font_funcs); |
207 } | 160 } |
208 return font_funcs; | 161 return font_funcs; |
209 } | 162 } |
210 | 163 |
211 // Returns the raw data of the font table |tag|. | 164 // Returns the raw data of the font table |tag|. |
212 hb_blob_t* GetFontTable(hb_face_t* face, hb_tag_t tag, void* user_data) { | 165 hb_blob_t* GetFontTable(hb_face_t* face, hb_tag_t tag, void* user_data) { |
213 SkTypeface* typeface = reinterpret_cast<SkTypeface*>(user_data); | 166 SkTypeface* typeface = reinterpret_cast<SkTypeface*>(user_data); |
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990 run->positions[i].set(run->width + x_offset, y_offset); | 943 run->positions[i].set(run->width + x_offset, y_offset); |
991 run->width += | 944 run->width += |
992 SkScalarRoundToInt(SkFixedToScalar(hb_positions[i].x_advance)); | 945 SkScalarRoundToInt(SkFixedToScalar(hb_positions[i].x_advance)); |
993 } | 946 } |
994 | 947 |
995 hb_buffer_destroy(buffer); | 948 hb_buffer_destroy(buffer); |
996 hb_font_destroy(harfbuzz_font); | 949 hb_font_destroy(harfbuzz_font); |
997 } | 950 } |
998 | 951 |
999 } // namespace gfx | 952 } // namespace gfx |
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