src/hb-font.h

   1 /*
   2  * Copyright (C) 2009  Red Hat, Inc.
   3  *
   4  *  This is part of HarfBuzz, an OpenType Layout engine library.
   5  *
   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.
  11  *
  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
  16  * DAMAGE.
  17  *
  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.
  23  *
  24  * Red Hat Author(s): Behdad Esfahbod
  25  */
  26
  27 #ifndef HB_FONT_H
  28 #define HB_FONT_H
  29
  30 #include "hb-common.h"
  31 #include "hb-blob.h"
  32
  33 HB_BEGIN_DECLS
  34
  35 typedef struct _hb_font_callbacks_t hb_font_callbacks_t;
  36 typedef struct _hb_unicode_callbacks_t hb_unicode_callbacks_t;
  37
  38 typedef struct _hb_face_t hb_face_t;
  39 typedef struct _hb_font_t hb_font_t;
  40
  41 typedef hb_blob_t * (*hb_get_table_func_t)  (hb_tag_t tag, void *user_data);
  42
  43
  44 /*
  45  * hb_font_callbacks_t
  46  */
  47
  48 hb_font_callbacks_t *
  49 hb_font_callbacks_create (void);
  50
  51 hb_font_callbacks_t *
  52 hb_font_callbacks_reference (hb_font_callbacks_t *fcallbacks);
  53
  54 unsigned int
  55 hb_font_callbacks_get_reference_count (hb_font_callbacks_t *fcallbacks);
  56
  57 void
  58 hb_font_callbacks_destroy (hb_font_callbacks_t *fcallbacks);
  59
  60 hb_font_callbacks_t *
  61 hb_font_callbacks_copy (hb_font_callbacks_t *fcallbacks);
  62
  63 /*
  64
  65 void
  66 hb_font_callbacks_set_glyph_func (hb_font_callbacks_t *fcallbacks,
  67                                   hb_font_get_glyph_func_t glyph_func);
  68
  69 void
  70 hb_font_callbacks_set_contour_point_func (hb_font_callbacks_t *fcallbacks,
  71                                           hb_font_get_contour_point_func_t contour_point_func);
  72
  73 void
  74 hb_font_callbacks_set_glyph_metrics_func (hb_font_callbacks_t *fcallbacks,
  75                                           hb_font_get_glyph_metrics_func_t glyph_metrics_func);
  76
  77 void
  78 hb_font_callbacks_set_kerning_func (hb_font_callbacks_t *fcallbacks,
  79                                     hb_font_get_kerning_func_t kerning_func);
  80
  81 */
  82
  83
  84 /*
  85  * hb_unicode_callbacks_t
  86  */
  87
  88 hb_unicode_callbacks_t *
  89 hb_unicode_callbacks_create (void);
  90
  91 hb_unicode_callbacks_t *
  92 hb_unicode_callbacks_reference (hb_unicode_callbacks_t *ucallbacks);
  93
  94 unsigned int
  95 hb_unicode_callbacks_get_reference_count (hb_unicode_callbacks_t *ucallbacks);
  96
  97 void
  98 hb_unicode_callbacks_destroy (hb_unicode_callbacks_t *ucallbacks);
  99
 100 hb_unicode_callbacks_t *
 101 hb_unicode_callbacks_copy (hb_unicode_callbacks_t *ucallbacks);
 102
 103 /*
 104
 105 void
 106 hb_unicode_callbacks_set_general_category_func (hb_unicode_callbacks_t *ucallbacks,
 107                                                 hb_unicode_get_general_category_func_t general_category_func);
 108
 109 void
 110 hb_unicode_callbacks_set_combining_class_func (hb_unicode_callbacks_t *ucallbacks,
 111                                                hb_unicode_get_combining_class_func_t combining_class_func);
 112
 113 void
 114 hb_unicode_callbacks_set_mirroring_char_func (hb_unicode_callbacks_t *ucallbacks,
 115                                               hb_unicode_get_mirroring_char_func_t mirroring_char_func);
 116
 117 void
 118 hb_unicode_callbacks_set_script_func (hb_unicode_callbacks_t *ucallbacks,
 119                                       hb_unicode_get_script_func_t script_func);
 120
 121 void
 122 hb_unicode_callbacks_set_eastasian_width_func (hb_unicode_callbacks_t *ucallbacks,
 123                                                hb_unicode_get_eastasian_width_func_t eastasian_width_func);
 124
 125 */
 126
 127
 128 /*
 129  * hb_face_t
 130  */
 131
 132 hb_face_t *
 133 hb_face_create_for_data (hb_blob_t    *blob,
 134                          unsigned int  index);
 135
 136 /* calls destory() when not needing user_data anymore */
 137 hb_face_t *
 138 hb_face_create_for_tables (hb_get_table_func_t  get_table,
 139                            hb_destroy_func_t    destroy,
 140                            void                *user_data);
 141
 142 hb_face_t *
 143 hb_face_reference (hb_face_t *face);
 144
 145 unsigned int
 146 hb_face_get_reference_count (hb_face_t *face);
 147
 148 void
 149 hb_face_destroy (hb_face_t *face);
 150
 151 void
 152 hb_face_set_font_callbacks (hb_face_t *face,
 153                             hb_font_callbacks_t *fcallbacks);
 154
 155 void
 156 hb_face_set_unicode_callbacks (hb_face_t *face,
 157                                hb_unicode_callbacks_t *ucallbacks);
 158
 159
 160
 161 /*
 162  * hb_font_t
 163  */
 164
 165 /* Fonts are very light-weight objects */
 166
 167 hb_font_t *
 168 hb_font_create (hb_face_t *face);
 169
 170 hb_font_t *
 171 hb_font_reference (hb_font_t *font);
 172
 173 unsigned int
 174 hb_font_get_reference_count (hb_font_t *font);
 175
 176 void
 177 hb_font_destroy (hb_font_t *font);
 178
 179 /*
 180  * XXX
 181  * should we decompose this to units_per_EM and font-size?
 182  * units_per_EM setting then can go into the face, or better,
 183  * read from the 'head' table.
 184  *
 185  * Then we either need size+shape like freetype does, or a full
 186  * matrix.
 187  */
 188 void
 189 hb_font_set_scale (hb_font_t *font,
 190                    hb_16dot16_t x_scale,
 191                    hb_16dot16_t y_scale);
 192
 193 /*
 194  * A zero value means "no hinting in that direction"
 195  */
 196 void
 197 hb_font_set_ppem (hb_font_t *font,
 198                   unsigned int x_ppem,
 199                   unsigned int y_ppem);
 200
 201
 202 HB_END_DECLS
 203
 204 #endif /* HB_FONT_H */