2 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
4 * This file is part of libass.
6 * libass is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * libass is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with libass; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include FT_FREETYPE_H
26 #include FT_SYNTHESIS_H
28 #include FT_TRUETYPE_TABLES_H
31 #include "ass_library.h"
33 #include "ass_bitmap.h"
34 #include "ass_cache.h"
35 #include "ass_fontconfig.h"
36 #include "ass_utils.h"
40 * Select Microfost Unicode CharMap, if the font has one.
41 * Otherwise, let FreeType decide.
43 static void charmap_magic(FT_Face face)
46 for (i = 0; i < face->num_charmaps; ++i) {
47 FT_CharMap cmap = face->charmaps[i];
48 unsigned pid = cmap->platform_id;
49 unsigned eid = cmap->encoding_id;
50 if (pid == 3 /*microsoft */
51 && (eid == 1 /*unicode bmp */
52 || eid == 10 /*full unicode */ )) {
53 FT_Set_Charmap(face, cmap);
59 if (face->num_charmaps == 0) {
60 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NoCharmaps);
63 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_NoCharmapAutodetected);
64 FT_Set_Charmap(face, face->charmaps[0]);
69 static void update_transform(ass_font_t *font)
73 m.xx = double_to_d16(font->scale_x);
74 m.yy = double_to_d16(font->scale_y);
76 for (i = 0; i < font->n_faces; ++i)
77 FT_Set_Transform(font->faces[i], &m, &font->v);
81 * \brief find a memory font by name
83 static int find_font(ass_library_t *library, char *name)
86 for (i = 0; i < library->num_fontdata; ++i)
87 if (strcasecmp(name, library->fontdata[i].name) == 0)
92 static void face_set_size(FT_Face face, double size);
94 static void buggy_font_workaround(FT_Face face)
96 // Some fonts have zero Ascender/Descender fields in 'hhea' table.
97 // In this case, get the information from 'os2' table or, as
98 // a last resort, from face.bbox.
99 if (face->ascender + face->descender == 0 || face->height == 0) {
100 TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
102 face->ascender = os2->sTypoAscender;
103 face->descender = os2->sTypoDescender;
104 face->height = face->ascender - face->descender;
106 face->ascender = face->bbox.yMax;
107 face->descender = face->bbox.yMin;
108 face->height = face->ascender - face->descender;
114 * \brief Select a face with the given charcode and add it to ass_font_t
115 * \return index of the new face in font->faces, -1 if failed
117 static int add_face(void *fc_priv, ass_font_t *font, uint32_t ch)
125 if (font->n_faces == ASS_FONT_MAX_FACES)
129 fontconfig_select(fc_priv, font->desc.family,
130 font->desc.treat_family_as_pattern,
131 font->desc.bold, font->desc.italic, &index, ch);
135 mem_idx = find_font(font->library, path);
138 FT_New_Memory_Face(font->ftlibrary,
139 (unsigned char *) font->library->
140 fontdata[mem_idx].data,
141 font->library->fontdata[mem_idx].size, 0,
144 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorOpeningMemoryFont,
149 error = FT_New_Face(font->ftlibrary, path, index, &face);
151 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorOpeningFont, path,
157 buggy_font_workaround(face);
159 font->faces[font->n_faces++] = face;
160 update_transform(font);
161 face_set_size(face, font->size);
162 return font->n_faces - 1;
166 * \brief Create a new ass_font_t according to "desc" argument
168 ass_font_t *ass_font_new(void *font_cache, ass_library_t *library,
169 FT_Library ftlibrary, void *fc_priv,
170 ass_font_desc_t *desc)
176 fontp = ass_font_cache_find((hashmap_t *) font_cache, desc);
180 font.library = library;
181 font.ftlibrary = ftlibrary;
183 font.desc.family = strdup(desc->family);
184 font.desc.treat_family_as_pattern = desc->treat_family_as_pattern;
185 font.desc.bold = desc->bold;
186 font.desc.italic = desc->italic;
188 font.scale_x = font.scale_y = 1.;
189 font.v.x = font.v.y = 0;
192 error = add_face(fc_priv, &font, 0);
194 free(font.desc.family);
197 return ass_font_cache_add((hashmap_t *) font_cache, &font);
201 * \brief Set font transformation matrix and shift vector
203 void ass_font_set_transform(ass_font_t *font, double scale_x,
204 double scale_y, FT_Vector * v)
206 font->scale_x = scale_x;
207 font->scale_y = scale_y;
210 update_transform(font);
213 static void face_set_size(FT_Face face, double size)
215 #if (FREETYPE_MAJOR > 2) || ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR > 1))
216 TT_HoriHeader *hori = FT_Get_Sfnt_Table(face, ft_sfnt_hhea);
217 TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2);
219 FT_Size_RequestRec rq;
220 FT_Size_Metrics *m = &face->size->metrics;
221 // VSFilter uses metrics from TrueType OS/2 table
222 // The idea was borrowed from asa (http://asa.diac24.net)
224 int hori_height = hori->Ascender - hori->Descender;
225 int os2_height = os2->usWinAscent + os2->usWinDescent;
226 if (hori_height && os2_height)
227 mscale = (double) hori_height / os2_height;
229 memset(&rq, 0, sizeof(rq));
230 rq.type = FT_SIZE_REQUEST_TYPE_REAL_DIM;
232 rq.height = double_to_d6(size * mscale);
233 rq.horiResolution = rq.vertResolution = 0;
234 FT_Request_Size(face, &rq);
235 m->ascender /= mscale;
236 m->descender /= mscale;
239 FT_Set_Char_Size(face, 0, double_to_d6(size), 0, 0);
244 * \brief Set font size
246 void ass_font_set_size(ass_font_t *font, double size)
249 if (font->size != size) {
251 for (i = 0; i < font->n_faces; ++i)
252 face_set_size(font->faces[i], size);
257 * \brief Get maximal font ascender and descender.
258 * \param ch character code
259 * The values are extracted from the font face that provides glyphs for the given character
261 void ass_font_get_asc_desc(ass_font_t *font, uint32_t ch, int *asc,
265 for (i = 0; i < font->n_faces; ++i) {
266 FT_Face face = font->faces[i];
267 if (FT_Get_Char_Index(face, ch)) {
268 *asc = face->size->metrics.ascender;
269 *desc = -face->size->metrics.descender;
279 * \param ch character code
281 FT_Glyph ass_font_get_glyph(void *fontconfig_priv, ass_font_t *font,
282 uint32_t ch, ass_hinting_t hinting)
293 if (font->n_faces == 0)
296 for (i = 0; i < font->n_faces; ++i) {
297 face = font->faces[i];
298 index = FT_Get_Char_Index(face, ch);
303 #ifdef CONFIG_FONTCONFIG
306 mp_msg(MSGT_ASS, MSGL_INFO,
307 MSGTR_LIBASS_GlyphNotFoundReselectingFont, ch,
308 font->desc.family, font->desc.bold, font->desc.italic);
309 face_idx = add_face(fontconfig_priv, font, ch);
311 face = font->faces[face_idx];
312 index = FT_Get_Char_Index(face, ch);
314 mp_msg(MSGT_ASS, MSGL_ERR, MSGTR_LIBASS_GlyphNotFound,
315 ch, font->desc.family, font->desc.bold,
323 case ASS_HINTING_NONE:
324 flags = FT_LOAD_NO_HINTING;
326 case ASS_HINTING_LIGHT:
327 flags = FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT;
329 case ASS_HINTING_NORMAL:
330 flags = FT_LOAD_FORCE_AUTOHINT;
332 case ASS_HINTING_NATIVE:
337 error = FT_Load_Glyph(face, index, FT_LOAD_NO_BITMAP | flags);
339 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorLoadingGlyph);
342 #if (FREETYPE_MAJOR > 2) || \
343 ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR >= 2)) || \
344 ((FREETYPE_MAJOR == 2) && (FREETYPE_MINOR == 1) && (FREETYPE_PATCH >= 10))
345 // FreeType >= 2.1.10 required
346 if (!(face->style_flags & FT_STYLE_FLAG_ITALIC) &&
347 (font->desc.italic > 55)) {
348 FT_GlyphSlot_Oblique(face->glyph);
351 error = FT_Get_Glyph(face->glyph, &glyph);
353 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_ErrorLoadingGlyph);
361 * \brief Get kerning for the pair of glyphs.
363 FT_Vector ass_font_get_kerning(ass_font_t *font, uint32_t c1, uint32_t c2)
365 FT_Vector v = { 0, 0 };
368 for (i = 0; i < font->n_faces; ++i) {
369 FT_Face face = font->faces[i];
370 int i1 = FT_Get_Char_Index(face, c1);
371 int i2 = FT_Get_Char_Index(face, c2);
373 if (FT_HAS_KERNING(face))
374 FT_Get_Kerning(face, i1, i2, FT_KERNING_DEFAULT, &v);
377 if (i1 || i2) // these glyphs are from different font faces, no kerning information
384 * \brief Deallocate ass_font_t
386 void ass_font_free(ass_font_t *font)
389 for (i = 0; i < font->n_faces; ++i)
391 FT_Done_Face(font->faces[i]);
392 if (font->desc.family)
393 free(font->desc.family);