hb-ot-shape-normalize.hh (3365B)
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 #include "hb-unicode.hh" 32 33 34 /* buffer var allocations, used during the normalization process */ 35 #define normalizer_glyph_index() var1.u32 36 37 struct hb_ot_shape_plan_t; 38 39 enum hb_ot_shape_normalization_mode_t { 40 HB_OT_SHAPE_NORMALIZATION_MODE_NONE, 41 HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED, 42 HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS, /* Never composes base-to-base */ 43 HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, /* Always fully decomposes and then recompose back */ 44 45 HB_OT_SHAPE_NORMALIZATION_MODE_AUTO, /* See hb-ot-shape-normalize.cc for logic. */ 46 HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT = HB_OT_SHAPE_NORMALIZATION_MODE_AUTO 47 }; 48 49 HB_INTERNAL void _hb_ot_shape_normalize (const hb_ot_shape_plan_t *shaper, 50 hb_buffer_t *buffer, 51 hb_font_t *font); 52 53 54 struct hb_ot_shape_normalize_context_t 55 { 56 static bool 57 decompose_unicode (const hb_ot_shape_normalize_context_t *c, 58 hb_codepoint_t ab, 59 hb_codepoint_t *a, 60 hb_codepoint_t *b) 61 { 62 return (bool) c->unicode->decompose (ab, a, b); 63 } 64 65 static bool 66 compose_unicode (const hb_ot_shape_normalize_context_t *c, 67 hb_codepoint_t a, 68 hb_codepoint_t b, 69 hb_codepoint_t *ab) 70 { 71 return (bool) c->unicode->compose (a, b, ab); 72 } 73 74 void 75 override_decompose_and_compose (bool (*decompose) (const hb_ot_shape_normalize_context_t *c, 76 hb_codepoint_t ab, 77 hb_codepoint_t *a, 78 hb_codepoint_t *b), 79 bool (*compose) (const hb_ot_shape_normalize_context_t *c, 80 hb_codepoint_t a, 81 hb_codepoint_t b, 82 hb_codepoint_t *ab)) 83 { 84 this->decompose = decompose ? decompose : decompose_unicode; 85 this->compose = compose ? compose : compose_unicode; 86 } 87 88 const hb_ot_shape_plan_t *plan; 89 hb_buffer_t *buffer; 90 hb_font_t *font; 91 hb_unicode_funcs_t *unicode; 92 bool (*decompose) (const hb_ot_shape_normalize_context_t *c, 93 hb_codepoint_t ab, 94 hb_codepoint_t *a, 95 hb_codepoint_t *b); 96 bool (*compose) (const hb_ot_shape_normalize_context_t *c, 97 hb_codepoint_t a, 98 hb_codepoint_t b, 99 hb_codepoint_t *ab); 100 }; 101 102 103 #endif /* HB_OT_SHAPE_NORMALIZE_HH */