Behdad Esfahbod | 02aeca9 | 2011-08-04 22:31:05 -0400 | [diff] [blame] | 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 | |
Behdad Esfahbod | c77ae40 | 2018-08-25 22:36:36 -0700 | [diff] [blame] | 27 | #include "hb-shaper-impl.hh" |
Behdad Esfahbod | 02aeca9 | 2011-08-04 22:31:05 -0400 | [diff] [blame] | 28 | |
Behdad Esfahbod | 23768a9 | 2019-06-17 20:29:29 -0700 | [diff] [blame] | 29 | #ifndef HB_NO_FALLBACK_SHAPE |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * shaper face data |
| 33 | */ |
| 34 | |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 35 | struct hb_fallback_face_data_t {}; |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 36 | |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 37 | hb_fallback_face_data_t * |
Behdad Esfahbod | 0beb66e | 2012-12-05 18:46:04 -0500 | [diff] [blame] | 38 | _hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED) |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 39 | { |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 40 | return (hb_fallback_face_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 41 | } |
| 42 | |
| 43 | void |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 44 | _hb_fallback_shaper_face_data_destroy (hb_fallback_face_data_t *data HB_UNUSED) |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 45 | { |
| 46 | } |
| 47 | |
| 48 | |
| 49 | /* |
| 50 | * shaper font data |
| 51 | */ |
| 52 | |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 53 | struct hb_fallback_font_data_t {}; |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 54 | |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 55 | hb_fallback_font_data_t * |
Behdad Esfahbod | 0beb66e | 2012-12-05 18:46:04 -0500 | [diff] [blame] | 56 | _hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED) |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 57 | { |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 58 | return (hb_fallback_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | void |
Behdad Esfahbod | 3d22aef | 2018-08-01 18:03:32 -0700 | [diff] [blame] | 62 | _hb_fallback_shaper_font_data_destroy (hb_fallback_font_data_t *data HB_UNUSED) |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 63 | { |
| 64 | } |
| 65 | |
| 66 | |
| 67 | /* |
Behdad Esfahbod | 027857d | 2012-07-26 17:34:25 -0400 | [diff] [blame] | 68 | * shaper |
| 69 | */ |
Behdad Esfahbod | 02aeca9 | 2011-08-04 22:31:05 -0400 | [diff] [blame] | 70 | |
| 71 | hb_bool_t |
Behdad Esfahbod | 0beb66e | 2012-12-05 18:46:04 -0500 | [diff] [blame] | 72 | _hb_fallback_shape (hb_shape_plan_t *shape_plan HB_UNUSED, |
Behdad Esfahbod | bd26b4d | 2012-07-26 22:05:39 -0400 | [diff] [blame] | 73 | hb_font_t *font, |
Behdad Esfahbod | 6bd9b47 | 2012-04-12 14:53:53 -0400 | [diff] [blame] | 74 | hb_buffer_t *buffer, |
Behdad Esfahbod | 93345ed | 2012-05-13 16:01:08 +0200 | [diff] [blame] | 75 | const hb_feature_t *features HB_UNUSED, |
| 76 | unsigned int num_features HB_UNUSED) |
Behdad Esfahbod | 02aeca9 | 2011-08-04 22:31:05 -0400 | [diff] [blame] | 77 | { |
Behdad Esfahbod | 6da9dbf | 2012-06-08 10:53:35 -0400 | [diff] [blame] | 78 | hb_codepoint_t space; |
Behdad Esfahbod | 8b5bc14 | 2016-02-24 19:05:23 +0900 | [diff] [blame] | 79 | bool has_space = (bool) font->get_nominal_glyph (' ', &space); |
Behdad Esfahbod | 6da9dbf | 2012-06-08 10:53:35 -0400 | [diff] [blame] | 80 | |
Behdad Esfahbod | 6da9dbf | 2012-06-08 10:53:35 -0400 | [diff] [blame] | 81 | buffer->clear_positions (); |
Behdad Esfahbod | 02aeca9 | 2011-08-04 22:31:05 -0400 | [diff] [blame] | 82 | |
Behdad Esfahbod | 7cd33f2 | 2014-07-17 14:22:11 -0400 | [diff] [blame] | 83 | hb_direction_t direction = buffer->props.direction; |
| 84 | hb_unicode_funcs_t *unicode = buffer->unicode; |
Behdad Esfahbod | 1b8196c | 2011-08-09 11:37:46 +0200 | [diff] [blame] | 85 | unsigned int count = buffer->len; |
Behdad Esfahbod | 7cd33f2 | 2014-07-17 14:22:11 -0400 | [diff] [blame] | 86 | hb_glyph_info_t *info = buffer->info; |
| 87 | hb_glyph_position_t *pos = buffer->pos; |
Behdad Esfahbod | 1b8196c | 2011-08-09 11:37:46 +0200 | [diff] [blame] | 88 | for (unsigned int i = 0; i < count; i++) |
Behdad Esfahbod | 6da9dbf | 2012-06-08 10:53:35 -0400 | [diff] [blame] | 89 | { |
Behdad Esfahbod | 7cd33f2 | 2014-07-17 14:22:11 -0400 | [diff] [blame] | 90 | if (has_space && unicode->is_default_ignorable (info[i].codepoint)) { |
| 91 | info[i].codepoint = space; |
| 92 | pos[i].x_advance = 0; |
| 93 | pos[i].y_advance = 0; |
Behdad Esfahbod | 6da9dbf | 2012-06-08 10:53:35 -0400 | [diff] [blame] | 94 | continue; |
| 95 | } |
Behdad Esfahbod | 1dd630a | 2017-02-01 11:57:21 -0800 | [diff] [blame] | 96 | (void) font->get_nominal_glyph (info[i].codepoint, &info[i].codepoint); |
Behdad Esfahbod | 7cd33f2 | 2014-07-17 14:22:11 -0400 | [diff] [blame] | 97 | font->get_glyph_advance_for_direction (info[i].codepoint, |
| 98 | direction, |
| 99 | &pos[i].x_advance, |
| 100 | &pos[i].y_advance); |
| 101 | font->subtract_glyph_origin_for_direction (info[i].codepoint, |
| 102 | direction, |
| 103 | &pos[i].x_offset, |
| 104 | &pos[i].y_offset); |
Behdad Esfahbod | 1b8196c | 2011-08-09 11:37:46 +0200 | [diff] [blame] | 105 | } |
| 106 | |
Behdad Esfahbod | 7cd33f2 | 2014-07-17 14:22:11 -0400 | [diff] [blame] | 107 | if (HB_DIRECTION_IS_BACKWARD (direction)) |
Behdad Esfahbod | 1b8196c | 2011-08-09 11:37:46 +0200 | [diff] [blame] | 108 | hb_buffer_reverse (buffer); |
| 109 | |
Behdad Esfahbod | 94d43c0 | 2021-12-04 16:56:39 -0800 | [diff] [blame] | 110 | buffer->clear_glyph_flags (); |
Behdad Esfahbod | e4da380 | 2017-11-10 17:14:27 -0800 | [diff] [blame] | 111 | |
Behdad Esfahbod | 0594a24 | 2012-06-05 20:35:40 -0400 | [diff] [blame] | 112 | return true; |
Behdad Esfahbod | 02aeca9 | 2011-08-04 22:31:05 -0400 | [diff] [blame] | 113 | } |
Behdad Esfahbod | 23768a9 | 2019-06-17 20:29:29 -0700 | [diff] [blame] | 114 | |
| 115 | #endif |