2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2009 Keith Stribley
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Red Hat Author(s): Behdad Esfahbod
28 #include "hb-private.hh"
32 #include "hb-font-private.hh"
34 #include FT_TRUETYPE_TABLES_H
41 * In general, this file does a fine job of what it's supposed to do.
42 * There are, however, things that need more work:
44 * - We don't handle any load_flags. That definitely has API implications. :(
45 * I believe hb_ft_font_create() should take load_flags input.
47 * - We don't handle / allow for emboldening / obliqueing.
49 * - In the future, we should add constructors to create fonts in font space.
51 * - I believe transforms are not correctly implemented. FreeType does not
52 * provide any API to get to the transform/delta set on the face. :(
54 * - Always use FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH?
59 hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
61 hb_codepoint_t unicode,
62 hb_codepoint_t variation_selector,
63 hb_codepoint_t *glyph,
64 void *user_data HB_UNUSED)
67 FT_Face ft_face = (FT_Face) font_data;
69 #ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
70 if (unlikely (variation_selector)) {
71 *glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
77 *glyph = FT_Get_Char_Index (ft_face, unicode);
82 hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
87 void *user_data HB_UNUSED)
89 FT_Face ft_face = (FT_Face) font_data;
90 int load_flags = FT_LOAD_DEFAULT;
92 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
95 *x = ft_face->glyph->metrics.horiAdvance;
100 hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
102 hb_codepoint_t glyph,
105 void *user_data HB_UNUSED)
107 FT_Face ft_face = (FT_Face) font_data;
108 int load_flags = FT_LOAD_DEFAULT;
110 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
113 *y = -ft_face->glyph->metrics.vertAdvance;
118 hb_ft_get_glyph_h_origin (hb_font_t *font HB_UNUSED,
119 void *font_data HB_UNUSED,
120 hb_codepoint_t glyph HB_UNUSED,
121 hb_position_t *x HB_UNUSED,
122 hb_position_t *y HB_UNUSED,
123 void *user_data HB_UNUSED)
125 /* We always work in the horizontal coordinates. */
130 hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
132 hb_codepoint_t glyph,
135 void *user_data HB_UNUSED)
137 FT_Face ft_face = (FT_Face) font_data;
138 int load_flags = FT_LOAD_DEFAULT;
140 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
143 /* XXX */*y = ft_face->glyph->metrics.vertAdvance;
148 hb_ft_get_glyph_h_kerning (hb_font_t *font HB_UNUSED,
150 hb_codepoint_t left_glyph,
151 hb_codepoint_t right_glyph,
154 void *user_data HB_UNUSED)
156 FT_Face ft_face = (FT_Face) font_data;
159 if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &kerning))
168 hb_ft_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
169 void *font_data HB_UNUSED,
170 hb_codepoint_t top_glyph HB_UNUSED,
171 hb_codepoint_t bottom_glyph HB_UNUSED,
172 hb_position_t *x HB_UNUSED,
173 hb_position_t *y HB_UNUSED,
174 void *user_data HB_UNUSED)
176 /* FreeType API doesn't support vertical kerning */
181 hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED,
183 hb_codepoint_t glyph,
184 hb_glyph_extents_t *extents,
185 void *user_data HB_UNUSED)
187 FT_Face ft_face = (FT_Face) font_data;
188 int load_flags = FT_LOAD_DEFAULT;
190 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
193 /* XXX: A few negations should be in order here, not sure. */
194 extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
195 extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
196 extents->width = ft_face->glyph->metrics.width;
197 extents->height = ft_face->glyph->metrics.height;
202 hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED,
204 hb_codepoint_t glyph,
205 unsigned int point_index,
208 void *user_data HB_UNUSED)
210 FT_Face ft_face = (FT_Face) font_data;
211 int load_flags = FT_LOAD_DEFAULT;
213 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
216 if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
219 if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
222 *x = ft_face->glyph->outline.points[point_index].x;
223 *y = ft_face->glyph->outline.points[point_index].y;
228 static hb_font_funcs_t ft_ffuncs = {
229 HB_OBJECT_HEADER_STATIC,
231 TRUE, /* immutable */
235 hb_ft_get_glyph_h_advance,
236 hb_ft_get_glyph_v_advance,
237 hb_ft_get_glyph_h_origin,
238 hb_ft_get_glyph_v_origin,
239 hb_ft_get_glyph_h_kerning,
240 hb_ft_get_glyph_v_kerning,
241 hb_ft_get_glyph_extents,
242 hb_ft_get_glyph_contour_point,
247 hb_ft_get_font_funcs (void)
254 get_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
256 FT_Face ft_face = (FT_Face) user_data;
261 if (unlikely (tag == HB_TAG_NONE))
264 error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
268 buffer = (FT_Byte *) malloc (length);
272 error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
276 return hb_blob_create ((const char *) buffer, length,
277 HB_MEMORY_MODE_WRITABLE,
283 hb_ft_face_create (FT_Face ft_face,
284 hb_destroy_func_t destroy)
288 if (ft_face->stream->read == NULL) {
291 blob = hb_blob_create ((const char *) ft_face->stream->base,
292 (unsigned int) ft_face->stream->size,
293 /* TODO: We assume that it's mmap()'ed, but FreeType code
294 * suggests that there are cases we reach here but font is
295 * not mmapped. For example, when mmap() fails. No idea
296 * how to deal with it better here. */
297 HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
299 face = hb_face_create (blob, ft_face->face_index);
300 hb_blob_destroy (blob);
302 face = hb_face_create_for_tables (get_table, ft_face, destroy);
309 hb_ft_face_finalize (FT_Face ft_face)
311 hb_face_destroy ((hb_face_t *) ft_face->generic.data);
315 hb_ft_face_create_cached (FT_Face ft_face)
317 if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize))
319 if (ft_face->generic.finalizer)
320 ft_face->generic.finalizer (ft_face);
322 ft_face->generic.data = hb_ft_face_create (ft_face, NULL);
323 ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize;
326 return hb_face_reference ((hb_face_t *) ft_face->generic.data);
331 hb_ft_font_create (FT_Face ft_face,
332 hb_destroy_func_t destroy)
337 face = hb_ft_face_create (ft_face, destroy);
338 font = hb_font_create (face);
339 hb_face_destroy (face);
340 hb_font_set_funcs (font,
341 hb_ft_get_font_funcs (),
343 hb_font_set_scale (font,
344 ((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16,
345 ((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16);
346 hb_font_set_ppem (font,
347 ft_face->size->metrics.x_ppem,
348 ft_face->size->metrics.y_ppem);