third_party/harfbuzz-ng/src/hb-ft.h

   1 /*
   2  * Copyright © 2009  Red Hat, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping 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_FT_H
  28 #define HB_FT_H
  29
  30 #include "hb.h"
  31
  32 #include <ft2build.h>
  33 #include FT_FREETYPE_H
  34
  35 HB_BEGIN_DECLS
  36
  37 /*
  38  * Note: FreeType is not thread-safe.
  39  * Hence, these functions are not either.
  40  */
  41
  42 /*
  43  * hb-face from ft-face.
  44  */
  45
  46 /* This one creates a new hb-face for given ft-face.
  47  * When the returned hb-face is destroyed, the destroy
  48  * callback is called (if not NULL), with the ft-face passed
  49  * to it.
  50  *
  51  * The client is responsible to make sure that ft-face is
  52  * destroyed after hb-face is destroyed.
  53  *
  54  * Most often you don't want this function.  You should use either
  55  * hb_ft_face_create_cached(), or hb_ft_face_create_referenced().
  56  * In particular, if you are going to pass NULL as destroy, you
  57  * probably should use (the more recent) hb_ft_face_create_referenced()
  58  * instead.
  59  */
  60 hb_face_t *
  61 hb_ft_face_create (FT_Face           ft_face,
  62                    hb_destroy_func_t destroy);
  63
  64 /* This version is like hb_ft_face_create(), except that it caches
  65  * the hb-face using the generic pointer of the ft-face.  This means
  66  * that subsequent calls to this function with the same ft-face will
  67  * return the same hb-face (correctly referenced).
  68  *
  69  * Client is still responsible for making sure that ft-face is destroyed
  70  * after hb-face is.
  71  */
  72 hb_face_t *
  73 hb_ft_face_create_cached (FT_Face ft_face);
  74
  75 /* This version is like hb_ft_face_create(), except that it calls
  76  * FT_Reference_Face() on ft-face, as such keeping ft-face alive
  77  * as long as the hb-face is.
  78  *
  79  * This is the most convenient version to use.  Use it unless you have
  80  * very good reasons not to.
  81  */
  82 hb_face_t *
  83 hb_ft_face_create_referenced (FT_Face ft_face);
  84
  85
  86 /*
  87  * hb-font from ft-face.
  88  */
  89
  90 /*
  91  * Note:
  92  *
  93  * Set face size on ft-face before creating hb-font from it.
  94  * Otherwise hb-ft would NOT pick up the font size correctly.
  95  */
  96
  97 /* See notes on hb_ft_face_create().  Same issues re lifecycle-management
  98  * apply here.  Use hb_ft_font_create_referenced() if you can. */
  99 hb_font_t *
 100 hb_ft_font_create (FT_Face           ft_face,
 101                    hb_destroy_func_t destroy);
 102
 103 /* See notes on hb_ft_face_create_referenced() re lifecycle-management
 104  * issues. */
 105 hb_font_t *
 106 hb_ft_font_create_referenced (FT_Face ft_face);
 107
 108
 109 /* Makes an hb_font_t use FreeType internally to implement font functions. */
 110 void
 111 hb_ft_font_set_funcs (hb_font_t *font);
 112
 113 FT_Face
 114 hb_ft_font_get_face (hb_font_t *font);
 115
 116
 117 HB_END_DECLS
 118
 119 #endif /* HB_FT_H */