gfx/harfbuzz/src/hb-ot-shape-normalize.hh

   1 /*
   2  * Copyright © 2012  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  * Google Author(s): Behdad Esfahbod
  25  */
  26
  27 #ifndef HB_OT_SHAPE_NORMALIZE_HH
  28 #define HB_OT_SHAPE_NORMALIZE_HH
  29
  30 #include "hb.hh"
  31
  32
  33 /* buffer var allocations, used during the normalization process */
  34 #define glyph_index()   var1.u32
  35
  36 struct hb_ot_shape_plan_t;
  37
  38 enum hb_ot_shape_normalization_mode_t {
  39   HB_OT_SHAPE_NORMALIZATION_MODE_NONE,
  40   HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED,
  41   HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS, /* Never composes base-to-base */
  42   HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, /* Always fully decomposes and then recompose back */
  43
  44   HB_OT_SHAPE_NORMALIZATION_MODE_AUTO, /* See hb-ot-shape-normalize.cc for logic. */
  45   HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT = HB_OT_SHAPE_NORMALIZATION_MODE_AUTO
  46 };
  47
  48 HB_INTERNAL void _hb_ot_shape_normalize (const hb_ot_shape_plan_t *shaper,
  49                                          hb_buffer_t *buffer,
  50                                          hb_font_t *font);
  51
  52
  53 struct hb_ot_shape_normalize_context_t
  54 {
  55   const hb_ot_shape_plan_t *plan;
  56   hb_buffer_t *buffer;
  57   hb_font_t *font;
  58   hb_unicode_funcs_t *unicode;
  59   const hb_codepoint_t not_found;
  60   bool (*decompose) (const hb_ot_shape_normalize_context_t *c,
  61                      hb_codepoint_t  ab,
  62                      hb_codepoint_t *a,
  63                      hb_codepoint_t *b);
  64   bool (*compose) (const hb_ot_shape_normalize_context_t *c,
  65                    hb_codepoint_t  a,
  66                    hb_codepoint_t  b,
  67                    hb_codepoint_t *ab);
  68 };
  69
  70
  71 #endif /* HB_OT_SHAPE_NORMALIZE_HH */