/src/harfbuzz/src/hb-paint-extents.cc
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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-extents.hh" |
30 | | |
31 | | #include "hb-draw.h" |
32 | | |
33 | | #include "hb-machinery.hh" |
34 | | |
35 | | |
36 | | /* |
37 | | * This file implements bounds-extraction as well as boundedness |
38 | | * computation of COLRv1 fonts as described in: |
39 | | * |
40 | | * https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness |
41 | | */ |
42 | | |
43 | | static void |
44 | | hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED, |
45 | | void *paint_data, |
46 | | float xx, float yx, |
47 | | float xy, float yy, |
48 | | float dx, float dy, |
49 | | void *user_data HB_UNUSED) |
50 | 730k | { |
51 | 730k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
52 | | |
53 | 730k | c->push_transform (hb_transform_t {xx, yx, xy, yy, dx, dy}); |
54 | 730k | } |
55 | | |
56 | | static void |
57 | | hb_paint_extents_pop_transform (hb_paint_funcs_t *funcs HB_UNUSED, |
58 | | void *paint_data, |
59 | | void *user_data HB_UNUSED) |
60 | 730k | { |
61 | 730k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
62 | | |
63 | 730k | c->pop_transform (); |
64 | 730k | } |
65 | | |
66 | | static void |
67 | | hb_draw_extents_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED, |
68 | | void *data, |
69 | | hb_draw_state_t *st, |
70 | | float to_x, float to_y, |
71 | | void *user_data HB_UNUSED) |
72 | 78.7k | { |
73 | 78.7k | hb_extents_t *extents = (hb_extents_t *) data; |
74 | | |
75 | 78.7k | extents->add_point (to_x, to_y); |
76 | 78.7k | } |
77 | | |
78 | | static void |
79 | | hb_draw_extents_line_to (hb_draw_funcs_t *dfuncs HB_UNUSED, |
80 | | void *data, |
81 | | hb_draw_state_t *st, |
82 | | float to_x, float to_y, |
83 | | void *user_data HB_UNUSED) |
84 | 342k | { |
85 | 342k | hb_extents_t *extents = (hb_extents_t *) data; |
86 | | |
87 | 342k | extents->add_point (to_x, to_y); |
88 | 342k | } |
89 | | |
90 | | static void |
91 | | hb_draw_extents_quadratic_to (hb_draw_funcs_t *dfuncs HB_UNUSED, |
92 | | void *data, |
93 | | hb_draw_state_t *st, |
94 | | float control_x, float control_y, |
95 | | float to_x, float to_y, |
96 | | void *user_data HB_UNUSED) |
97 | 147k | { |
98 | 147k | hb_extents_t *extents = (hb_extents_t *) data; |
99 | | |
100 | 147k | extents->add_point (control_x, control_y); |
101 | 147k | extents->add_point (to_x, to_y); |
102 | 147k | } |
103 | | |
104 | | static void |
105 | | hb_draw_extents_cubic_to (hb_draw_funcs_t *dfuncs HB_UNUSED, |
106 | | void *data, |
107 | | hb_draw_state_t *st, |
108 | | float control1_x, float control1_y, |
109 | | float control2_x, float control2_y, |
110 | | float to_x, float to_y, |
111 | | void *user_data HB_UNUSED) |
112 | 409k | { |
113 | 409k | hb_extents_t *extents = (hb_extents_t *) data; |
114 | | |
115 | 409k | extents->add_point (control1_x, control1_y); |
116 | 409k | extents->add_point (control2_x, control2_y); |
117 | 409k | extents->add_point (to_x, to_y); |
118 | 409k | } |
119 | | |
120 | | static inline void free_static_draw_extents_funcs (); |
121 | | |
122 | | static struct hb_draw_extents_funcs_lazy_loader_t : hb_draw_funcs_lazy_loader_t<hb_draw_extents_funcs_lazy_loader_t> |
123 | | { |
124 | | static hb_draw_funcs_t *create () |
125 | 597 | { |
126 | 597 | hb_draw_funcs_t *funcs = hb_draw_funcs_create (); |
127 | | |
128 | 597 | hb_draw_funcs_set_move_to_func (funcs, hb_draw_extents_move_to, nullptr, nullptr); |
129 | 597 | hb_draw_funcs_set_line_to_func (funcs, hb_draw_extents_line_to, nullptr, nullptr); |
130 | 597 | hb_draw_funcs_set_quadratic_to_func (funcs, hb_draw_extents_quadratic_to, nullptr, nullptr); |
131 | 597 | hb_draw_funcs_set_cubic_to_func (funcs, hb_draw_extents_cubic_to, nullptr, nullptr); |
132 | | |
133 | 597 | hb_draw_funcs_make_immutable (funcs); |
134 | | |
135 | 597 | hb_atexit (free_static_draw_extents_funcs); |
136 | | |
137 | 597 | return funcs; |
138 | 597 | } |
139 | | } static_draw_extents_funcs; |
140 | | |
141 | | static inline |
142 | | void free_static_draw_extents_funcs () |
143 | 0 | { |
144 | 0 | static_draw_extents_funcs.free_instance (); |
145 | 0 | } |
146 | | |
147 | | static hb_draw_funcs_t * |
148 | | hb_draw_extents_get_funcs () |
149 | 285k | { |
150 | 285k | return static_draw_extents_funcs.get_unconst (); |
151 | 285k | } |
152 | | |
153 | | static void |
154 | | hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED, |
155 | | void *paint_data, |
156 | | hb_codepoint_t glyph, |
157 | | hb_font_t *font, |
158 | | void *user_data HB_UNUSED) |
159 | 285k | { |
160 | 285k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
161 | | |
162 | 285k | hb_extents_t extents; |
163 | 285k | hb_draw_funcs_t *draw_extent_funcs = hb_draw_extents_get_funcs (); |
164 | 285k | hb_font_draw_glyph (font, glyph, draw_extent_funcs, &extents); |
165 | 285k | c->push_clip (extents); |
166 | 285k | } |
167 | | |
168 | | static void |
169 | | hb_paint_extents_push_clip_rectangle (hb_paint_funcs_t *funcs HB_UNUSED, |
170 | | void *paint_data, |
171 | | float xmin, float ymin, float xmax, float ymax, |
172 | | void *user_data) |
173 | 15.9k | { |
174 | 15.9k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
175 | | |
176 | 15.9k | hb_extents_t extents = {xmin, ymin, xmax, ymax}; |
177 | 15.9k | c->push_clip (extents); |
178 | 15.9k | } |
179 | | |
180 | | static void |
181 | | hb_paint_extents_pop_clip (hb_paint_funcs_t *funcs HB_UNUSED, |
182 | | void *paint_data, |
183 | | void *user_data HB_UNUSED) |
184 | 301k | { |
185 | 301k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
186 | | |
187 | 301k | c->pop_clip (); |
188 | 301k | } |
189 | | |
190 | | static void |
191 | | hb_paint_extents_push_group (hb_paint_funcs_t *funcs HB_UNUSED, |
192 | | void *paint_data, |
193 | | void *user_data HB_UNUSED) |
194 | 2.76M | { |
195 | 2.76M | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
196 | | |
197 | 2.76M | c->push_group (); |
198 | 2.76M | } |
199 | | |
200 | | static void |
201 | | hb_paint_extents_pop_group (hb_paint_funcs_t *funcs HB_UNUSED, |
202 | | void *paint_data, |
203 | | hb_paint_composite_mode_t mode, |
204 | | void *user_data HB_UNUSED) |
205 | 2.76M | { |
206 | 2.76M | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
207 | | |
208 | 2.76M | c->pop_group (mode); |
209 | 2.76M | } |
210 | | |
211 | | static hb_bool_t |
212 | | hb_paint_extents_paint_image (hb_paint_funcs_t *funcs HB_UNUSED, |
213 | | void *paint_data, |
214 | | hb_blob_t *blob HB_UNUSED, |
215 | | unsigned int width HB_UNUSED, |
216 | | unsigned int height HB_UNUSED, |
217 | | hb_tag_t format HB_UNUSED, |
218 | | float slant HB_UNUSED, |
219 | | hb_glyph_extents_t *glyph_extents, |
220 | | void *user_data HB_UNUSED) |
221 | 0 | { |
222 | 0 | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
223 | |
|
224 | 0 | hb_extents_t extents = {(float) glyph_extents->x_bearing, |
225 | 0 | (float) glyph_extents->y_bearing + glyph_extents->height, |
226 | 0 | (float) glyph_extents->x_bearing + glyph_extents->width, |
227 | 0 | (float) glyph_extents->y_bearing}; |
228 | 0 | c->push_clip (extents); |
229 | 0 | c->paint (); |
230 | 0 | c->pop_clip (); |
231 | |
|
232 | 0 | return true; |
233 | 0 | } |
234 | | |
235 | | static void |
236 | | hb_paint_extents_paint_color (hb_paint_funcs_t *funcs HB_UNUSED, |
237 | | void *paint_data, |
238 | | hb_bool_t use_foreground HB_UNUSED, |
239 | | hb_color_t color HB_UNUSED, |
240 | | void *user_data HB_UNUSED) |
241 | 235k | { |
242 | 235k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
243 | | |
244 | 235k | c->paint (); |
245 | 235k | } |
246 | | |
247 | | static void |
248 | | hb_paint_extents_paint_linear_gradient (hb_paint_funcs_t *funcs HB_UNUSED, |
249 | | void *paint_data, |
250 | | hb_color_line_t *color_line HB_UNUSED, |
251 | | float x0 HB_UNUSED, float y0 HB_UNUSED, |
252 | | float x1 HB_UNUSED, float y1 HB_UNUSED, |
253 | | float x2 HB_UNUSED, float y2 HB_UNUSED, |
254 | | void *user_data HB_UNUSED) |
255 | 26.0k | { |
256 | 26.0k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
257 | | |
258 | 26.0k | c->paint (); |
259 | 26.0k | } |
260 | | |
261 | | static void |
262 | | hb_paint_extents_paint_radial_gradient (hb_paint_funcs_t *funcs HB_UNUSED, |
263 | | void *paint_data, |
264 | | hb_color_line_t *color_line HB_UNUSED, |
265 | | float x0 HB_UNUSED, float y0 HB_UNUSED, float r0 HB_UNUSED, |
266 | | float x1 HB_UNUSED, float y1 HB_UNUSED, float r1 HB_UNUSED, |
267 | | void *user_data HB_UNUSED) |
268 | 29.9k | { |
269 | 29.9k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
270 | | |
271 | 29.9k | c->paint (); |
272 | 29.9k | } |
273 | | |
274 | | static void |
275 | | hb_paint_extents_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED, |
276 | | void *paint_data, |
277 | | hb_color_line_t *color_line HB_UNUSED, |
278 | | float cx HB_UNUSED, float cy HB_UNUSED, |
279 | | float start_angle HB_UNUSED, |
280 | | float end_angle HB_UNUSED, |
281 | | void *user_data HB_UNUSED) |
282 | 16.4k | { |
283 | 16.4k | hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data; |
284 | | |
285 | 16.4k | c->paint (); |
286 | 16.4k | } |
287 | | |
288 | | static inline void free_static_paint_extents_funcs (); |
289 | | |
290 | | static struct hb_paint_extents_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_paint_extents_funcs_lazy_loader_t> |
291 | | { |
292 | | static hb_paint_funcs_t *create () |
293 | 758 | { |
294 | 758 | hb_paint_funcs_t *funcs = hb_paint_funcs_create (); |
295 | | |
296 | 758 | hb_paint_funcs_set_push_transform_func (funcs, hb_paint_extents_push_transform, nullptr, nullptr); |
297 | 758 | hb_paint_funcs_set_pop_transform_func (funcs, hb_paint_extents_pop_transform, nullptr, nullptr); |
298 | 758 | hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_paint_extents_push_clip_glyph, nullptr, nullptr); |
299 | 758 | hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_paint_extents_push_clip_rectangle, nullptr, nullptr); |
300 | 758 | hb_paint_funcs_set_pop_clip_func (funcs, hb_paint_extents_pop_clip, nullptr, nullptr); |
301 | 758 | hb_paint_funcs_set_push_group_func (funcs, hb_paint_extents_push_group, nullptr, nullptr); |
302 | 758 | hb_paint_funcs_set_pop_group_func (funcs, hb_paint_extents_pop_group, nullptr, nullptr); |
303 | 758 | hb_paint_funcs_set_color_func (funcs, hb_paint_extents_paint_color, nullptr, nullptr); |
304 | 758 | hb_paint_funcs_set_image_func (funcs, hb_paint_extents_paint_image, nullptr, nullptr); |
305 | 758 | hb_paint_funcs_set_linear_gradient_func (funcs, hb_paint_extents_paint_linear_gradient, nullptr, nullptr); |
306 | 758 | hb_paint_funcs_set_radial_gradient_func (funcs, hb_paint_extents_paint_radial_gradient, nullptr, nullptr); |
307 | 758 | hb_paint_funcs_set_sweep_gradient_func (funcs, hb_paint_extents_paint_sweep_gradient, nullptr, nullptr); |
308 | | |
309 | 758 | hb_paint_funcs_make_immutable (funcs); |
310 | | |
311 | 758 | hb_atexit (free_static_paint_extents_funcs); |
312 | | |
313 | 758 | return funcs; |
314 | 758 | } |
315 | | } static_paint_extents_funcs; |
316 | | |
317 | | static inline |
318 | | void free_static_paint_extents_funcs () |
319 | 0 | { |
320 | 0 | static_paint_extents_funcs.free_instance (); |
321 | 0 | } |
322 | | |
323 | | hb_paint_funcs_t * |
324 | | hb_paint_extents_get_funcs () |
325 | 36.6k | { |
326 | 36.6k | return static_paint_extents_funcs.get_unconst (); |
327 | 36.6k | } |
328 | | |
329 | | |
330 | | #endif |