1 /*
   2  * Copyright © 2017  Google, 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_OT_H_IN
  28 #error "Include <hb-ot.h> instead."
  29 #endif
  30 
  31 #ifndef HB_OT_VAR_H
  32 #define HB_OT_VAR_H
  33 
  34 #include "hb.h"
  35 
  36 HB_BEGIN_DECLS
  37 
  38 
  39 #define HB_OT_TAG_VAR_AXIS_ITALIC       HB_TAG('i','t','a','l')
  40 #define HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE HB_TAG('o','p','s','z')
  41 #define HB_OT_TAG_VAR_AXIS_SLANT        HB_TAG('s','l','n','t')
  42 #define HB_OT_TAG_VAR_AXIS_WIDTH        HB_TAG('w','d','t','h')
  43 #define HB_OT_TAG_VAR_AXIS_WEIGHT       HB_TAG('w','g','h','t')
  44 
  45 
  46 /*
  47  * fvar / avar
  48  */
  49 
  50 /**
  51  * hb_ot_var_axis_t:
  52  *
  53  * Since: 1.4.2
  54  */
  55 typedef struct hb_ot_var_axis_t {
  56   hb_tag_t tag;
  57   unsigned int name_id;
  58   float min_value;
  59   float default_value;
  60   float max_value;
  61 } hb_ot_var_axis_t;
  62 
  63 HB_EXTERN hb_bool_t
  64 hb_ot_var_has_data (hb_face_t *face);
  65 
  66 /**
  67  * HB_OT_VAR_NO_AXIS_INDEX:
  68  *
  69  * Since: 1.4.2
  70  */
  71 #define HB_OT_VAR_NO_AXIS_INDEX         0xFFFFFFFFu
  72 
  73 HB_EXTERN unsigned int
  74 hb_ot_var_get_axis_count (hb_face_t *face);
  75 
  76 HB_EXTERN unsigned int
  77 hb_ot_var_get_axes (hb_face_t        *face,
  78                     unsigned int      start_offset,
  79                     unsigned int     *axes_count /* IN/OUT */,
  80                     hb_ot_var_axis_t *axes_array /* OUT */);
  81 
  82 HB_EXTERN hb_bool_t
  83 hb_ot_var_find_axis (hb_face_t        *face,
  84                      hb_tag_t          axis_tag,
  85                      unsigned int     *axis_index,
  86                      hb_ot_var_axis_t *axis_info);
  87 
  88 
  89 HB_EXTERN void
  90 hb_ot_var_normalize_variations (hb_face_t            *face,
  91                                 const hb_variation_t *variations, /* IN */
  92                                 unsigned int          variations_length,
  93                                 int                  *coords, /* OUT */
  94                                 unsigned int          coords_length);
  95 
  96 HB_EXTERN void
  97 hb_ot_var_normalize_coords (hb_face_t    *face,
  98                             unsigned int coords_length,
  99                             const float *design_coords, /* IN */
 100                             int *normalized_coords /* OUT */);
 101 
 102 
 103 HB_END_DECLS
 104 
 105 #endif /* HB_OT_VAR_H */