2 * Copyright (C) 2009 Red Hat, Inc.
4 * This is part of HarfBuzz, a text shaping library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Red Hat Author(s): Behdad Esfahbod
30 #include "hb-common.h"
36 typedef struct _hb_face_t hb_face_t;
37 typedef struct _hb_font_t hb_font_t;
44 hb_face_create_for_data (hb_blob_t *blob,
47 typedef hb_blob_t * (*hb_get_table_func_t) (hb_tag_t tag, void *user_data);
49 /* calls destroy() when not needing user_data anymore */
51 hb_face_create_for_tables (hb_get_table_func_t get_table,
52 hb_destroy_func_t destroy,
56 hb_face_reference (hb_face_t *face);
59 hb_face_get_reference_count (hb_face_t *face);
62 hb_face_destroy (hb_face_t *face);
66 * I have two major concerns about this API as it is right now:
68 * - Jonathan Kew convinced me to make it return NULL if table not found (280af1bd),
69 * however, that is WRONG IMO. The API should not differentiate between a non-existing
70 * table vs a zero-length table vs a very short table. It only leads to implementations
71 * that check for non-NULL and assume that they've got a usable table going on... This
72 * actually happened with Firefox.
74 * - It has to be renamed to reference_table() since unlike any other _get_ API, a reference
75 * ownership transfer happens and the user is responsible to destroy the result.
78 hb_face_get_table (hb_face_t *face,
82 hb_face_get_upem (hb_face_t *face);
89 typedef struct _hb_font_funcs_t hb_font_funcs_t;
92 hb_font_funcs_create (void);
95 hb_font_funcs_reference (hb_font_funcs_t *ffuncs);
98 hb_font_funcs_get_reference_count (hb_font_funcs_t *ffuncs);
101 hb_font_funcs_destroy (hb_font_funcs_t *ffuncs);
104 hb_font_funcs_copy (hb_font_funcs_t *ffuncs);
107 hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs);
110 hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs);
114 typedef struct _hb_glyph_extents_t
116 hb_position_t x_bearing;
117 hb_position_t y_bearing;
119 hb_position_t height;
120 } hb_glyph_extents_t;
122 typedef hb_codepoint_t (*hb_font_get_glyph_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
123 hb_codepoint_t unicode, hb_codepoint_t variation_selector);
124 typedef void (*hb_font_get_glyph_advance_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
125 hb_codepoint_t glyph,
126 hb_position_t *x_advance, hb_position_t *y_advance);
127 typedef void (*hb_font_get_glyph_extents_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
128 hb_codepoint_t glyph,
129 hb_glyph_extents_t *metrics);
130 typedef hb_bool_t (*hb_font_get_contour_point_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
131 unsigned int point_index, hb_codepoint_t glyph,
132 hb_position_t *x, hb_position_t *y);
133 typedef hb_position_t (*hb_font_get_kerning_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
134 hb_codepoint_t first_glyph, hb_codepoint_t second_glyph);
138 hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
139 hb_font_get_glyph_func_t glyph_func);
142 hb_font_funcs_set_glyph_advance_func (hb_font_funcs_t *ffuncs,
143 hb_font_get_glyph_advance_func_t glyph_advance_func);
146 hb_font_funcs_set_glyph_extents_func (hb_font_funcs_t *ffuncs,
147 hb_font_get_glyph_extents_func_t glyph_extents_func);
150 hb_font_funcs_set_contour_point_func (hb_font_funcs_t *ffuncs,
151 hb_font_get_contour_point_func_t contour_point_func);
154 hb_font_funcs_set_kerning_func (hb_font_funcs_t *ffuncs,
155 hb_font_get_kerning_func_t kerning_func);
158 /* These never return NULL. Return fallback defaults instead. */
160 hb_font_get_glyph_func_t
161 hb_font_funcs_get_glyph_func (hb_font_funcs_t *ffuncs);
163 hb_font_get_glyph_advance_func_t
164 hb_font_funcs_get_glyph_advance_func (hb_font_funcs_t *ffuncs);
166 hb_font_get_glyph_extents_func_t
167 hb_font_funcs_get_glyph_extents_func (hb_font_funcs_t *ffuncs);
169 hb_font_get_contour_point_func_t
170 hb_font_funcs_get_contour_point_func (hb_font_funcs_t *ffuncs);
172 hb_font_get_kerning_func_t
173 hb_font_funcs_get_kerning_func (hb_font_funcs_t *ffuncs);
177 hb_font_get_glyph (hb_font_t *font, hb_face_t *face,
178 hb_codepoint_t unicode, hb_codepoint_t variation_selector);
181 hb_font_get_glyph_advance (hb_font_t *font, hb_face_t *face,
182 hb_codepoint_t glyph,
183 hb_position_t *x_advance, hb_position_t *y_advance);
186 hb_font_get_glyph_extents (hb_font_t *font, hb_face_t *face,
187 hb_codepoint_t glyph,
188 hb_glyph_extents_t *metrics);
191 hb_font_get_contour_point (hb_font_t *font, hb_face_t *face,
192 unsigned int point_index, hb_codepoint_t glyph,
193 hb_position_t *x, hb_position_t *y);
196 hb_font_get_kerning (hb_font_t *font, hb_face_t *face,
197 hb_codepoint_t first_glyph, hb_codepoint_t second_glyph);
204 /* Fonts are very light-weight objects */
207 hb_font_create (void);
210 hb_font_reference (hb_font_t *font);
213 hb_font_get_reference_count (hb_font_t *font);
216 hb_font_destroy (hb_font_t *font);
219 hb_font_set_funcs (hb_font_t *font,
220 hb_font_funcs_t *klass,
221 hb_destroy_func_t destroy,
224 /* Returns what was set and unsets it, but doesn't destroy(user_data).
225 * This is useful for wrapping / chaining font_funcs_t's.
227 * The client is responsible for:
229 * - Take ownership of the reference on the returned klass,
231 * - Calling "destroy(user_data)" exactly once if returned destroy func
232 * is not NULL and the returned info is not needed anymore.
235 hb_font_unset_funcs (hb_font_t *font,
236 hb_font_funcs_t **klass,
237 hb_destroy_func_t *destroy,
242 * We should add support for full matrices.
245 hb_font_set_scale (hb_font_t *font,
246 unsigned int x_scale,
247 unsigned int y_scale);
250 hb_font_get_scale (hb_font_t *font,
251 unsigned int *x_scale,
252 unsigned int *y_scale);
255 * A zero value means "no hinting in that direction"
258 hb_font_set_ppem (hb_font_t *font,
260 unsigned int y_ppem);
263 hb_font_get_ppem (hb_font_t *font,
264 unsigned int *x_ppem,
265 unsigned int *y_ppem);
270 #endif /* HB_FONT_H */