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,
85 hb_position_t *x_advance,
86 hb_position_t *y_advance,
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_advance = ft_face->glyph->metrics.horiAdvance;
100 hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
102 hb_codepoint_t glyph,
103 hb_position_t *x_advance,
104 hb_position_t *y_advance,
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_advance = -ft_face->glyph->metrics.vertAdvance;
118 hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
120 hb_codepoint_t glyph,
121 hb_position_t *x_origin,
122 hb_position_t *y_origin,
123 void *user_data HB_UNUSED)
125 FT_Face ft_face = (FT_Face) font_data;
126 int load_flags = FT_LOAD_DEFAULT;
128 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
131 *y_origin = ft_face->glyph->metrics.vertAdvance;
136 hb_ft_get_h_kerning (hb_font_t *font HB_UNUSED,
138 hb_codepoint_t left_glyph,
139 hb_codepoint_t right_glyph,
140 hb_position_t *x_kern,
141 hb_position_t *y_kern,
142 void *user_data HB_UNUSED)
144 FT_Face ft_face = (FT_Face) font_data;
147 if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &kerning))
156 hb_ft_get_v_kerning (hb_font_t *font HB_UNUSED,
158 hb_codepoint_t top_glyph,
159 hb_codepoint_t bottom_glyph,
160 hb_position_t *x_kern,
161 hb_position_t *y_kern,
162 void *user_data HB_UNUSED)
164 /* FreeType API doesn't support vertical kerning */
169 hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED,
171 hb_codepoint_t glyph,
173 hb_glyph_extents_t *extents,
174 void *user_data HB_UNUSED)
176 FT_Face ft_face = (FT_Face) font_data;
177 int load_flags = FT_LOAD_DEFAULT;
179 /* TODO: load_flags, embolden, etc, shape/transform */
181 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
184 /* XXX: A few negations should be in order here, not sure. */
185 extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
186 extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
187 extents->width = ft_face->glyph->metrics.width;
188 extents->height = ft_face->glyph->metrics.height;
193 hb_ft_get_contour_point (hb_font_t *font HB_UNUSED,
195 hb_codepoint_t glyph,
196 unsigned int point_index,
200 void *user_data HB_UNUSED)
202 FT_Face ft_face = (FT_Face) font_data;
203 int load_flags = FT_LOAD_DEFAULT;
205 if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
208 if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
211 if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
214 *x = ft_face->glyph->outline.points[point_index].x;
215 *y = ft_face->glyph->outline.points[point_index].y;
216 *vertical = FALSE; /* We always return position in horizontal coordinates */
221 static hb_font_funcs_t ft_ffuncs = {
222 HB_OBJECT_HEADER_STATIC,
224 TRUE, /* immutable */
228 hb_ft_get_glyph_h_advance,
229 hb_ft_get_glyph_v_advance,
230 hb_ft_get_glyph_v_origin,
233 hb_ft_get_glyph_extents,
234 hb_ft_get_contour_point,
239 hb_ft_get_font_funcs (void)
246 get_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
248 FT_Face ft_face = (FT_Face) user_data;
253 if (unlikely (tag == HB_TAG_NONE))
256 error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
260 buffer = (FT_Byte *) malloc (length);
264 error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
268 return hb_blob_create ((const char *) buffer, length,
269 HB_MEMORY_MODE_WRITABLE,
275 hb_ft_face_create (FT_Face ft_face,
276 hb_destroy_func_t destroy)
280 if (ft_face->stream->read == NULL) {
283 blob = hb_blob_create ((const char *) ft_face->stream->base,
284 (unsigned int) ft_face->stream->size,
285 /* TODO: We assume that it's mmap()'ed, but FreeType code
286 * suggests that there are cases we reach here but font is
287 * not mmapped. For example, when mmap() fails. No idea
288 * how to deal with it better here. */
289 HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
291 face = hb_face_create (blob, ft_face->face_index);
292 hb_blob_destroy (blob);
294 face = hb_face_create_for_tables (get_table, ft_face, destroy);
301 hb_ft_face_finalize (FT_Face ft_face)
303 hb_face_destroy ((hb_face_t *) ft_face->generic.data);
307 hb_ft_face_create_cached (FT_Face ft_face)
309 if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize))
311 if (ft_face->generic.finalizer)
312 ft_face->generic.finalizer (ft_face);
314 ft_face->generic.data = hb_ft_face_create (ft_face, NULL);
315 ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize;
318 return hb_face_reference ((hb_face_t *) ft_face->generic.data);
323 hb_ft_font_create (FT_Face ft_face,
324 hb_destroy_func_t destroy)
329 face = hb_ft_face_create (ft_face, destroy);
330 font = hb_font_create (face);
331 hb_face_destroy (face);
332 hb_font_set_funcs (font,
333 hb_ft_get_font_funcs (),
335 hb_font_set_scale (font,
336 ((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16,
337 ((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16);
338 hb_font_set_ppem (font,
339 ft_face->size->metrics.x_ppem,
340 ft_face->size->metrics.y_ppem);