hb-paint-bounded.cc (6539B)
1 /* 2 * Copyright © 2022 Behdad Esfahbod 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 25 #include "hb.hh" 26 27 #ifndef HB_NO_PAINT 28 29 #include "hb-paint-bounded.hh" 30 31 #include "hb-machinery.hh" 32 33 34 /* 35 * This file implements boundedness computation of COLRv1 fonts as described in: 36 * 37 * https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness 38 */ 39 40 static void 41 hb_paint_bounded_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED, 42 void *paint_data, 43 hb_codepoint_t glyph, 44 hb_font_t *font, 45 void *user_data HB_UNUSED) 46 { 47 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 48 49 c->push_clip (); 50 } 51 52 static void 53 hb_paint_bounded_push_clip_rectangle (hb_paint_funcs_t *funcs HB_UNUSED, 54 void *paint_data, 55 float xmin, float ymin, float xmax, float ymax, 56 void *user_data) 57 { 58 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 59 60 c->push_clip (); 61 } 62 63 static void 64 hb_paint_bounded_pop_clip (hb_paint_funcs_t *funcs HB_UNUSED, 65 void *paint_data, 66 void *user_data HB_UNUSED) 67 { 68 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 69 70 c->pop_clip (); 71 } 72 73 static void 74 hb_paint_bounded_push_group (hb_paint_funcs_t *funcs HB_UNUSED, 75 void *paint_data, 76 void *user_data HB_UNUSED) 77 { 78 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 79 80 c->push_group (); 81 } 82 83 static void 84 hb_paint_bounded_pop_group (hb_paint_funcs_t *funcs HB_UNUSED, 85 void *paint_data, 86 hb_paint_composite_mode_t mode, 87 void *user_data HB_UNUSED) 88 { 89 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 90 91 c->pop_group (mode); 92 } 93 94 static hb_bool_t 95 hb_paint_bounded_paint_image (hb_paint_funcs_t *funcs HB_UNUSED, 96 void *paint_data, 97 hb_blob_t *blob HB_UNUSED, 98 unsigned int width HB_UNUSED, 99 unsigned int height HB_UNUSED, 100 hb_tag_t format HB_UNUSED, 101 float slant HB_UNUSED, 102 hb_glyph_extents_t *glyph_extents, 103 void *user_data HB_UNUSED) 104 { 105 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 106 107 c->push_clip (); 108 c->paint (); 109 c->pop_clip (); 110 111 return true; 112 } 113 114 static void 115 hb_paint_bounded_paint_color (hb_paint_funcs_t *funcs HB_UNUSED, 116 void *paint_data, 117 hb_bool_t use_foreground HB_UNUSED, 118 hb_color_t color HB_UNUSED, 119 void *user_data HB_UNUSED) 120 { 121 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 122 123 c->paint (); 124 } 125 126 static void 127 hb_paint_bounded_paint_linear_gradient (hb_paint_funcs_t *funcs HB_UNUSED, 128 void *paint_data, 129 hb_color_line_t *color_line HB_UNUSED, 130 float x0 HB_UNUSED, float y0 HB_UNUSED, 131 float x1 HB_UNUSED, float y1 HB_UNUSED, 132 float x2 HB_UNUSED, float y2 HB_UNUSED, 133 void *user_data HB_UNUSED) 134 { 135 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 136 137 c->paint (); 138 } 139 140 static void 141 hb_paint_bounded_paint_radial_gradient (hb_paint_funcs_t *funcs HB_UNUSED, 142 void *paint_data, 143 hb_color_line_t *color_line HB_UNUSED, 144 float x0 HB_UNUSED, float y0 HB_UNUSED, float r0 HB_UNUSED, 145 float x1 HB_UNUSED, float y1 HB_UNUSED, float r1 HB_UNUSED, 146 void *user_data HB_UNUSED) 147 { 148 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 149 150 c->paint (); 151 } 152 153 static void 154 hb_paint_bounded_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED, 155 void *paint_data, 156 hb_color_line_t *color_line HB_UNUSED, 157 float cx HB_UNUSED, float cy HB_UNUSED, 158 float start_angle HB_UNUSED, 159 float end_angle HB_UNUSED, 160 void *user_data HB_UNUSED) 161 { 162 hb_paint_bounded_context_t *c = (hb_paint_bounded_context_t *) paint_data; 163 164 c->paint (); 165 } 166 167 static inline void free_static_paint_bounded_funcs (); 168 169 static struct hb_paint_bounded_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_paint_bounded_funcs_lazy_loader_t> 170 { 171 static hb_paint_funcs_t *create () 172 { 173 hb_paint_funcs_t *funcs = hb_paint_funcs_create (); 174 175 hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_paint_bounded_push_clip_glyph, nullptr, nullptr); 176 hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_paint_bounded_push_clip_rectangle, nullptr, nullptr); 177 hb_paint_funcs_set_pop_clip_func (funcs, hb_paint_bounded_pop_clip, nullptr, nullptr); 178 hb_paint_funcs_set_push_group_func (funcs, hb_paint_bounded_push_group, nullptr, nullptr); 179 hb_paint_funcs_set_pop_group_func (funcs, hb_paint_bounded_pop_group, nullptr, nullptr); 180 hb_paint_funcs_set_color_func (funcs, hb_paint_bounded_paint_color, nullptr, nullptr); 181 hb_paint_funcs_set_image_func (funcs, hb_paint_bounded_paint_image, nullptr, nullptr); 182 hb_paint_funcs_set_linear_gradient_func (funcs, hb_paint_bounded_paint_linear_gradient, nullptr, nullptr); 183 hb_paint_funcs_set_radial_gradient_func (funcs, hb_paint_bounded_paint_radial_gradient, nullptr, nullptr); 184 hb_paint_funcs_set_sweep_gradient_func (funcs, hb_paint_bounded_paint_sweep_gradient, nullptr, nullptr); 185 186 hb_paint_funcs_make_immutable (funcs); 187 188 hb_atexit (free_static_paint_bounded_funcs); 189 190 return funcs; 191 } 192 } static_paint_bounded_funcs; 193 194 static inline 195 void free_static_paint_bounded_funcs () 196 { 197 static_paint_bounded_funcs.free_instance (); 198 } 199 200 hb_paint_funcs_t * 201 hb_paint_bounded_get_funcs () 202 { 203 return static_paint_bounded_funcs.get_unconst (); 204 } 205 206 207 #endif