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comparison: gfx/harfbuzz/src/hb-fallback-shape.cc
gfx/harfbuzz/src/hb-fallback-shape.cc
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| -1:000000000000 | 0:3f87f9a92dba |
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| 1 /* | |
| 2 * Copyright © 2011 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 #define HB_SHAPER fallback | |
| 28 #include "hb-shaper-impl-private.hh" | |
| 29 | |
| 30 | |
| 31 /* | |
| 32 * shaper face data | |
| 33 */ | |
| 34 | |
| 35 struct hb_fallback_shaper_face_data_t {}; | |
| 36 | |
| 37 hb_fallback_shaper_face_data_t * | |
| 38 _hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED) | |
| 39 { | |
| 40 return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED; | |
| 41 } | |
| 42 | |
| 43 void | |
| 44 _hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED) | |
| 45 { | |
| 46 } | |
| 47 | |
| 48 | |
| 49 /* | |
| 50 * shaper font data | |
| 51 */ | |
| 52 | |
| 53 struct hb_fallback_shaper_font_data_t {}; | |
| 54 | |
| 55 hb_fallback_shaper_font_data_t * | |
| 56 _hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED) | |
| 57 { | |
| 58 return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; | |
| 59 } | |
| 60 | |
| 61 void | |
| 62 _hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED) | |
| 63 { | |
| 64 } | |
| 65 | |
| 66 | |
| 67 /* | |
| 68 * shaper shape_plan data | |
| 69 */ | |
| 70 | |
| 71 struct hb_fallback_shaper_shape_plan_data_t {}; | |
| 72 | |
| 73 hb_fallback_shaper_shape_plan_data_t * | |
| 74 _hb_fallback_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, | |
| 75 const hb_feature_t *user_features HB_UNUSED, | |
| 76 unsigned int num_user_features HB_UNUSED) | |
| 77 { | |
| 78 return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; | |
| 79 } | |
| 80 | |
| 81 void | |
| 82 _hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED) | |
| 83 { | |
| 84 } | |
| 85 | |
| 86 | |
| 87 /* | |
| 88 * shaper | |
| 89 */ | |
| 90 | |
| 91 hb_bool_t | |
| 92 _hb_fallback_shape (hb_shape_plan_t *shape_plan HB_UNUSED, | |
| 93 hb_font_t *font, | |
| 94 hb_buffer_t *buffer, | |
| 95 const hb_feature_t *features HB_UNUSED, | |
| 96 unsigned int num_features HB_UNUSED) | |
| 97 { | |
| 98 /* TODO | |
| 99 * | |
| 100 * - Apply fallback kern. | |
| 101 * - Handle Variation Selectors? | |
| 102 * - Apply normalization? | |
| 103 * | |
| 104 * This will make the fallback shaper into a dumb "TrueType" | |
| 105 * shaper which many people unfortunately still request. | |
| 106 */ | |
| 107 | |
| 108 bool has_space; | |
| 109 hb_codepoint_t space; | |
| 110 has_space = font->get_glyph (' ', 0, &space); | |
| 111 | |
| 112 buffer->clear_positions (); | |
| 113 | |
| 114 unsigned int count = buffer->len; | |
| 115 | |
| 116 for (unsigned int i = 0; i < count; i++) | |
| 117 { | |
| 118 if (has_space && buffer->unicode->is_default_ignorable (buffer->info[i].codepoint)) { | |
| 119 buffer->info[i].codepoint = space; | |
| 120 buffer->pos[i].x_advance = 0; | |
| 121 buffer->pos[i].y_advance = 0; | |
| 122 continue; | |
| 123 } | |
| 124 font->get_glyph (buffer->info[i].codepoint, 0, &buffer->info[i].codepoint); | |
| 125 font->get_glyph_advance_for_direction (buffer->info[i].codepoint, | |
| 126 buffer->props.direction, | |
| 127 &buffer->pos[i].x_advance, | |
| 128 &buffer->pos[i].y_advance); | |
| 129 font->subtract_glyph_origin_for_direction (buffer->info[i].codepoint, | |
| 130 buffer->props.direction, | |
| 131 &buffer->pos[i].x_offset, | |
| 132 &buffer->pos[i].y_offset); | |
| 133 } | |
| 134 | |
| 135 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) | |
| 136 hb_buffer_reverse (buffer); | |
| 137 | |
| 138 return true; | |
| 139 } |
