1 | /* |
2 | * Copyright © 2012 Red Hat Inc. |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License as published by the Free Software Foundation; either |
7 | * version 2.1 of the License, or (at your option) any later version. |
8 | * |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library. If not, see <http://www.gnu.org/licenses/>. |
16 | * |
17 | * Authors: Benjamin Otte <otte@gnome.org> |
18 | */ |
19 | |
20 | #include "config.h" |
21 | |
22 | #include "gtkcssimageconicprivate.h" |
23 | |
24 | #include <math.h> |
25 | |
26 | #include "gtkcsscolorvalueprivate.h" |
27 | #include "gtkcssnumbervalueprivate.h" |
28 | #include "gtkcsspositionvalueprivate.h" |
29 | #include "gtkcssprovider.h" |
30 | |
31 | G_DEFINE_TYPE (GtkCssImageConic, gtk_css_image_conic, GTK_TYPE_CSS_IMAGE) |
32 | |
33 | static void |
34 | gtk_css_image_conic_snapshot (GtkCssImage *image, |
35 | GtkSnapshot *snapshot, |
36 | double width, |
37 | double height) |
38 | { |
39 | GtkCssImageConic *self = GTK_CSS_IMAGE_CONIC (image); |
40 | GskColorStop *stops; |
41 | int i, last; |
42 | double offset; |
43 | |
44 | stops = g_newa (GskColorStop, self->n_stops); |
45 | |
46 | last = -1; |
47 | offset = 0; |
48 | for (i = 0; i < self->n_stops; i++) |
49 | { |
50 | const GtkCssImageConicColorStop *stop = &self->color_stops[i]; |
51 | double pos, step; |
52 | |
53 | if (stop->offset == NULL) |
54 | { |
55 | if (i == 0) |
56 | pos = 0.0; |
57 | else if (i + 1 == self->n_stops) |
58 | pos = 1.0; |
59 | else |
60 | continue; |
61 | } |
62 | else |
63 | { |
64 | pos = _gtk_css_number_value_get (number: stop->offset, one_hundred_percent: 360) / 360; |
65 | pos = CLAMP (pos, 0.0, 1.0); |
66 | } |
67 | |
68 | pos = MAX (pos, offset); |
69 | step = (pos - offset) / (i - last); |
70 | for (last = last + 1; last <= i; last++) |
71 | { |
72 | stop = &self->color_stops[last]; |
73 | |
74 | offset += step; |
75 | |
76 | stops[last].offset = offset; |
77 | stops[last].color = *gtk_css_color_value_get_rgba (color: stop->color); |
78 | } |
79 | |
80 | offset = pos; |
81 | last = i; |
82 | } |
83 | |
84 | gtk_snapshot_append_conic_gradient ( |
85 | snapshot, |
86 | bounds: &GRAPHENE_RECT_INIT (0, 0, width, height), |
87 | center: &GRAPHENE_POINT_INIT (_gtk_css_position_value_get_x (self->center, width), |
88 | _gtk_css_position_value_get_y (self->center, height)), |
89 | rotation: _gtk_css_number_value_get (number: self->rotation, one_hundred_percent: 360), |
90 | stops, |
91 | n_stops: self->n_stops); |
92 | } |
93 | |
94 | static gboolean |
95 | parse_angles (GtkCssParser *parser, |
96 | gpointer option_data, |
97 | gpointer unused) |
98 | { |
99 | GtkCssValue **angles = option_data; |
100 | |
101 | angles[0] = _gtk_css_number_value_parse (parser, flags: GTK_CSS_PARSE_ANGLE | GTK_CSS_PARSE_PERCENT); |
102 | if (angles[0] == NULL) |
103 | return FALSE; |
104 | |
105 | if (gtk_css_number_value_can_parse (parser)) |
106 | { |
107 | angles[1] = _gtk_css_number_value_parse (parser, flags: GTK_CSS_PARSE_ANGLE | GTK_CSS_PARSE_PERCENT); |
108 | if (angles[1] == NULL) |
109 | return FALSE; |
110 | } |
111 | |
112 | return TRUE; |
113 | } |
114 | |
115 | static gboolean |
116 | parse_color (GtkCssParser *parser, |
117 | gpointer option_data, |
118 | gpointer unused) |
119 | { |
120 | GtkCssValue **color = option_data; |
121 | |
122 | *color = _gtk_css_color_value_parse (parser); |
123 | if (*color == NULL) |
124 | return FALSE; |
125 | |
126 | return TRUE; |
127 | } |
128 | |
129 | static guint |
130 | gtk_css_image_conic_parse_color_stop (GtkCssImageConic *self, |
131 | GtkCssParser *parser, |
132 | GArray *stop_array) |
133 | { |
134 | GtkCssValue *angles[2] = { NULL, NULL }; |
135 | GtkCssValue *color = NULL; |
136 | GtkCssParseOption options[] = |
137 | { |
138 | { (void *) gtk_css_number_value_can_parse, parse_angles, &angles }, |
139 | { (void *) gtk_css_color_value_can_parse, parse_color, &color }, |
140 | }; |
141 | |
142 | if (!gtk_css_parser_consume_any (parser, options, G_N_ELEMENTS (options), NULL)) |
143 | goto fail; |
144 | |
145 | if (color == NULL) |
146 | { |
147 | gtk_css_parser_error_syntax (self: parser, format: "Expected shadow value to contain a length" ); |
148 | goto fail; |
149 | } |
150 | |
151 | g_array_append_vals (array: stop_array, data: (GtkCssImageConicColorStop[1]) { |
152 | { angles[0], color } |
153 | }, |
154 | len: 1); |
155 | if (angles[1]) |
156 | g_array_append_vals (array: stop_array, data: (GtkCssImageConicColorStop[1]) { |
157 | { .offset: angles[1], .color: gtk_css_value_ref (value: color) } |
158 | }, |
159 | len: 1); |
160 | |
161 | return 1; |
162 | |
163 | fail: |
164 | g_clear_pointer (&angles[0], gtk_css_value_unref); |
165 | g_clear_pointer (&angles[1], gtk_css_value_unref); |
166 | g_clear_pointer (&color, gtk_css_value_unref); |
167 | return 0; |
168 | } |
169 | |
170 | static guint |
171 | gtk_css_image_conic_parse_first_arg (GtkCssImageConic *self, |
172 | GtkCssParser *parser, |
173 | GArray *stop_array) |
174 | { |
175 | gboolean nothing_parsed = TRUE; |
176 | |
177 | if (gtk_css_parser_try_ident (self: parser, ident: "from" )) |
178 | { |
179 | self->rotation = _gtk_css_number_value_parse (parser, flags: GTK_CSS_PARSE_ANGLE); |
180 | if (self->rotation == NULL) |
181 | return 0; |
182 | nothing_parsed = FALSE; |
183 | } |
184 | else |
185 | { |
186 | self->rotation = _gtk_css_number_value_new (value: 0, unit: GTK_CSS_DEG); |
187 | } |
188 | |
189 | if (gtk_css_parser_try_ident (self: parser, ident: "at" )) |
190 | { |
191 | self->center = _gtk_css_position_value_parse (parser); |
192 | if (self->center == NULL) |
193 | return 0; |
194 | nothing_parsed = FALSE; |
195 | } |
196 | else |
197 | { |
198 | self->center = _gtk_css_position_value_new (x: _gtk_css_number_value_new (value: 50, unit: GTK_CSS_PERCENT), |
199 | y: _gtk_css_number_value_new (value: 50, unit: GTK_CSS_PERCENT)); |
200 | } |
201 | |
202 | if (!nothing_parsed) |
203 | return 1; |
204 | |
205 | return 1 + gtk_css_image_conic_parse_color_stop (self, parser, stop_array); |
206 | } |
207 | |
208 | typedef struct |
209 | { |
210 | GtkCssImageConic *self; |
211 | GArray *stop_array; |
212 | } ParseData; |
213 | |
214 | static guint |
215 | gtk_css_image_conic_parse_arg (GtkCssParser *parser, |
216 | guint arg, |
217 | gpointer user_data) |
218 | { |
219 | ParseData *parse_data = user_data; |
220 | GtkCssImageConic *self = parse_data->self; |
221 | |
222 | if (arg == 0) |
223 | return gtk_css_image_conic_parse_first_arg (self, parser, stop_array: parse_data->stop_array); |
224 | else |
225 | return gtk_css_image_conic_parse_color_stop (self, parser, stop_array: parse_data->stop_array); |
226 | } |
227 | |
228 | static gboolean |
229 | gtk_css_image_conic_parse (GtkCssImage *image, |
230 | GtkCssParser *parser) |
231 | { |
232 | GtkCssImageConic *self = GTK_CSS_IMAGE_CONIC (image); |
233 | ParseData parse_data; |
234 | gboolean success; |
235 | |
236 | if (!gtk_css_parser_has_function (self: parser, name: "conic-gradient" )) |
237 | { |
238 | gtk_css_parser_error_syntax (self: parser, format: "Not a conic gradient" ); |
239 | return FALSE; |
240 | } |
241 | |
242 | parse_data.self = self; |
243 | parse_data.stop_array = g_array_new (TRUE, FALSE, element_size: sizeof (GtkCssImageConicColorStop)); |
244 | |
245 | success = gtk_css_parser_consume_function (self: parser, min_args: 3, G_MAXUINT, parse_func: gtk_css_image_conic_parse_arg, data: &parse_data); |
246 | |
247 | if (!success) |
248 | { |
249 | g_array_free (array: parse_data.stop_array, TRUE); |
250 | } |
251 | else |
252 | { |
253 | self->n_stops = parse_data.stop_array->len; |
254 | self->color_stops = (GtkCssImageConicColorStop *)g_array_free (array: parse_data.stop_array, FALSE); |
255 | } |
256 | |
257 | return success; |
258 | } |
259 | |
260 | static void |
261 | gtk_css_image_conic_print (GtkCssImage *image, |
262 | GString *string) |
263 | { |
264 | GtkCssImageConic *self = GTK_CSS_IMAGE_CONIC (image); |
265 | gboolean written = FALSE; |
266 | guint i; |
267 | |
268 | g_string_append (string, val: "self-gradient(" ); |
269 | |
270 | if (self->center) |
271 | { |
272 | GtkCssValue *compare = _gtk_css_position_value_new (x: _gtk_css_number_value_new (value: 50, unit: GTK_CSS_PERCENT), |
273 | y: _gtk_css_number_value_new (value: 50, unit: GTK_CSS_PERCENT)); |
274 | |
275 | if (!_gtk_css_value_equal (value1: self->center, value2: compare)) |
276 | { |
277 | g_string_append (string, val: "from " ); |
278 | _gtk_css_value_print (value: self->center, string); |
279 | written = TRUE; |
280 | } |
281 | |
282 | gtk_css_value_unref (value: compare); |
283 | } |
284 | |
285 | if (self->rotation && _gtk_css_number_value_get (number: self->rotation, one_hundred_percent: 360) != 0) |
286 | { |
287 | if (written) |
288 | g_string_append_c (string, ' '); |
289 | g_string_append (string, val: "at " ); |
290 | _gtk_css_value_print (value: self->rotation, string); |
291 | } |
292 | |
293 | if (written) |
294 | g_string_append (string, val: ", " ); |
295 | |
296 | for (i = 0; i < self->n_stops; i++) |
297 | { |
298 | const GtkCssImageConicColorStop *stop = &self->color_stops[i]; |
299 | |
300 | if (i > 0) |
301 | g_string_append (string, val: ", " ); |
302 | |
303 | _gtk_css_value_print (value: stop->color, string); |
304 | |
305 | if (stop->offset) |
306 | { |
307 | g_string_append (string, val: " " ); |
308 | _gtk_css_value_print (value: stop->offset, string); |
309 | } |
310 | } |
311 | |
312 | g_string_append (string, val: ")" ); |
313 | } |
314 | |
315 | static GtkCssImage * |
316 | gtk_css_image_conic_compute (GtkCssImage *image, |
317 | guint property_id, |
318 | GtkStyleProvider *provider, |
319 | GtkCssStyle *style, |
320 | GtkCssStyle *parent_style) |
321 | { |
322 | GtkCssImageConic *self = GTK_CSS_IMAGE_CONIC (image); |
323 | GtkCssImageConic *copy; |
324 | guint i; |
325 | |
326 | copy = g_object_new (GTK_TYPE_CSS_IMAGE_CONIC, NULL); |
327 | |
328 | copy->center = _gtk_css_value_compute (value: self->center, property_id, provider, style, parent_style); |
329 | copy->rotation = _gtk_css_value_compute (value: self->rotation, property_id, provider, style, parent_style); |
330 | |
331 | copy->n_stops = self->n_stops; |
332 | copy->color_stops = g_malloc (n_bytes: sizeof (GtkCssImageConicColorStop) * copy->n_stops); |
333 | for (i = 0; i < self->n_stops; i++) |
334 | { |
335 | const GtkCssImageConicColorStop *stop = &self->color_stops[i]; |
336 | GtkCssImageConicColorStop *scopy = ©->color_stops[i]; |
337 | |
338 | scopy->color = _gtk_css_value_compute (value: stop->color, property_id, provider, style, parent_style); |
339 | |
340 | if (stop->offset) |
341 | { |
342 | scopy->offset = _gtk_css_value_compute (value: stop->offset, property_id, provider, style, parent_style); |
343 | } |
344 | else |
345 | { |
346 | scopy->offset = NULL; |
347 | } |
348 | } |
349 | |
350 | return GTK_CSS_IMAGE (copy); |
351 | } |
352 | |
353 | static GtkCssImage * |
354 | gtk_css_image_conic_transition (GtkCssImage *start_image, |
355 | GtkCssImage *end_image, |
356 | guint property_id, |
357 | double progress) |
358 | { |
359 | GtkCssImageConic *start, *end, *result; |
360 | guint i; |
361 | |
362 | start = GTK_CSS_IMAGE_CONIC (start_image); |
363 | |
364 | if (end_image == NULL) |
365 | return GTK_CSS_IMAGE_CLASS (gtk_css_image_conic_parent_class)->transition (start_image, end_image, property_id, progress); |
366 | |
367 | if (!GTK_IS_CSS_IMAGE_CONIC (end_image)) |
368 | return GTK_CSS_IMAGE_CLASS (gtk_css_image_conic_parent_class)->transition (start_image, end_image, property_id, progress); |
369 | |
370 | end = GTK_CSS_IMAGE_CONIC (end_image); |
371 | |
372 | if (start->n_stops != end->n_stops) |
373 | return GTK_CSS_IMAGE_CLASS (gtk_css_image_conic_parent_class)->transition (start_image, end_image, property_id, progress); |
374 | |
375 | result = g_object_new (GTK_TYPE_CSS_IMAGE_CONIC, NULL); |
376 | |
377 | result->center = _gtk_css_value_transition (start: start->center, end: end->center, property_id, progress); |
378 | if (result->center == NULL) |
379 | goto fail; |
380 | |
381 | result->rotation = _gtk_css_value_transition (start: start->rotation, end: end->rotation, property_id, progress); |
382 | if (result->rotation == NULL) |
383 | goto fail; |
384 | |
385 | result->color_stops = g_malloc (n_bytes: sizeof (GtkCssImageConicColorStop) * start->n_stops); |
386 | result->n_stops = 0; |
387 | for (i = 0; i < start->n_stops; i++) |
388 | { |
389 | const GtkCssImageConicColorStop *start_stop = &start->color_stops[i]; |
390 | const GtkCssImageConicColorStop *end_stop = &end->color_stops[i]; |
391 | GtkCssImageConicColorStop *stop = &result->color_stops[i]; |
392 | |
393 | if ((start_stop->offset != NULL) != (end_stop->offset != NULL)) |
394 | goto fail; |
395 | |
396 | if (start_stop->offset == NULL) |
397 | { |
398 | stop->offset = NULL; |
399 | } |
400 | else |
401 | { |
402 | stop->offset = _gtk_css_value_transition (start: start_stop->offset, |
403 | end: end_stop->offset, |
404 | property_id, |
405 | progress); |
406 | if (stop->offset == NULL) |
407 | goto fail; |
408 | } |
409 | |
410 | stop->color = _gtk_css_value_transition (start: start_stop->color, |
411 | end: end_stop->color, |
412 | property_id, |
413 | progress); |
414 | if (stop->color == NULL) |
415 | { |
416 | if (stop->offset) |
417 | _gtk_css_value_unref (value: stop->offset); |
418 | goto fail; |
419 | } |
420 | |
421 | result->n_stops ++; |
422 | } |
423 | |
424 | return GTK_CSS_IMAGE (result); |
425 | |
426 | fail: |
427 | g_object_unref (object: result); |
428 | return GTK_CSS_IMAGE_CLASS (gtk_css_image_conic_parent_class)->transition (start_image, end_image, property_id, progress); |
429 | } |
430 | |
431 | static gboolean |
432 | gtk_css_image_conic_equal (GtkCssImage *image1, |
433 | GtkCssImage *image2) |
434 | { |
435 | GtkCssImageConic *conic1 = (GtkCssImageConic *) image1; |
436 | GtkCssImageConic *conic2 = (GtkCssImageConic *) image2; |
437 | guint i; |
438 | |
439 | if (!_gtk_css_value_equal (value1: conic1->center, value2: conic2->center) || |
440 | !_gtk_css_value_equal (value1: conic1->rotation, value2: conic2->rotation)) |
441 | return FALSE; |
442 | |
443 | for (i = 0; i < conic1->n_stops; i++) |
444 | { |
445 | const GtkCssImageConicColorStop *stop1 = &conic1->color_stops[i]; |
446 | const GtkCssImageConicColorStop *stop2 = &conic2->color_stops[i]; |
447 | |
448 | if (!_gtk_css_value_equal0 (value1: stop1->offset, value2: stop2->offset) || |
449 | !_gtk_css_value_equal (value1: stop1->color, value2: stop2->color)) |
450 | return FALSE; |
451 | } |
452 | |
453 | return TRUE; |
454 | } |
455 | |
456 | static void |
457 | gtk_css_image_conic_dispose (GObject *object) |
458 | { |
459 | GtkCssImageConic *self = GTK_CSS_IMAGE_CONIC (object); |
460 | guint i; |
461 | |
462 | for (i = 0; i < self->n_stops; i ++) |
463 | { |
464 | GtkCssImageConicColorStop *stop = &self->color_stops[i]; |
465 | |
466 | _gtk_css_value_unref (value: stop->color); |
467 | if (stop->offset) |
468 | _gtk_css_value_unref (value: stop->offset); |
469 | } |
470 | g_free (mem: self->color_stops); |
471 | |
472 | g_clear_pointer (&self->center, gtk_css_value_unref); |
473 | g_clear_pointer (&self->rotation, gtk_css_value_unref); |
474 | |
475 | G_OBJECT_CLASS (gtk_css_image_conic_parent_class)->dispose (object); |
476 | } |
477 | |
478 | static gboolean |
479 | gtk_css_image_conic_is_computed (GtkCssImage *image) |
480 | { |
481 | GtkCssImageConic *self = GTK_CSS_IMAGE_CONIC (image); |
482 | guint i; |
483 | gboolean computed = TRUE; |
484 | |
485 | computed = !self->center || gtk_css_value_is_computed (value: self->center); |
486 | computed &= !self->rotation || gtk_css_value_is_computed (value: self->rotation); |
487 | |
488 | for (i = 0; i < self->n_stops; i ++) |
489 | { |
490 | const GtkCssImageConicColorStop *stop = &self->color_stops[i]; |
491 | |
492 | if (stop->offset && !gtk_css_value_is_computed (value: stop->offset)) |
493 | { |
494 | computed = FALSE; |
495 | break; |
496 | } |
497 | |
498 | if (!gtk_css_value_is_computed (value: stop->color)) |
499 | { |
500 | computed = FALSE; |
501 | break; |
502 | } |
503 | } |
504 | |
505 | return computed; |
506 | } |
507 | |
508 | static void |
509 | gtk_css_image_conic_class_init (GtkCssImageConicClass *klass) |
510 | { |
511 | GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass); |
512 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
513 | |
514 | image_class->snapshot = gtk_css_image_conic_snapshot; |
515 | image_class->parse = gtk_css_image_conic_parse; |
516 | image_class->print = gtk_css_image_conic_print; |
517 | image_class->compute = gtk_css_image_conic_compute; |
518 | image_class->equal = gtk_css_image_conic_equal; |
519 | image_class->transition = gtk_css_image_conic_transition; |
520 | image_class->is_computed = gtk_css_image_conic_is_computed; |
521 | |
522 | object_class->dispose = gtk_css_image_conic_dispose; |
523 | } |
524 | |
525 | static void |
526 | gtk_css_image_conic_init (GtkCssImageConic *self) |
527 | { |
528 | } |
529 | |
530 | |