summaryrefslogtreecommitdiff
path: root/gtk/gtkiconhelper.c
blob: 597a1f0a25a960df532e366fa167558c2db79a03 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
/* GTK - The GIMP Toolkit
 * Copyright (C) 2011 Red Hat, Inc.
 *
 * Authors: Cosimo Cecchi <cosimoc@gnome.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include "gtkiconhelperprivate.h"

#include <math.h>

#include "gtkcssenumvalueprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcsstransientnodeprivate.h"
#include "gtkiconthemeprivate.h"
#include "gtkrendericonprivate.h"
#include "gtkscalerprivate.h"
#include "gtksnapshot.h"
#include "gtkwidgetprivate.h"
#include "gdk/gdkprofilerprivate.h"

struct _GtkIconHelper
{
  GObject parent_instance;

  GtkImageDefinition *def;

  int pixel_size;

  guint use_fallback : 1;
  guint texture_is_symbolic : 1;

  GtkWidget *owner;
  GtkCssNode *node;
  GdkPaintable *paintable;
};

static GtkIconLookupFlags
get_icon_lookup_flags (GtkIconHelper *self,
                       GtkCssStyle   *style)
{
  GtkIconLookupFlags flags;
  GtkCssIconStyle icon_style;

  flags = 0;

  icon_style = _gtk_css_icon_style_value_get (style->icon->icon_style);

  switch (icon_style)
    {
    case GTK_CSS_ICON_STYLE_REGULAR:
      flags |= GTK_ICON_LOOKUP_FORCE_REGULAR;
      break;
    case GTK_CSS_ICON_STYLE_SYMBOLIC:
      flags |= GTK_ICON_LOOKUP_FORCE_SYMBOLIC;
      break;
    case GTK_CSS_ICON_STYLE_REQUESTED:
      break;
    default:
      g_assert_not_reached ();
      return 0;
    }

  return flags;
}

static GdkPaintable *
ensure_paintable_for_gicon (GtkIconHelper    *self,
                            GtkCssStyle      *style,
                            GtkTextDirection  dir,
                            int               scale,
                            gboolean          preload,
                            GIcon            *gicon,
                            gboolean         *symbolic)
{
  GtkIconTheme *icon_theme;
  int width, height;
  GtkIconPaintable *icon;
  GtkIconLookupFlags flags;

  icon_theme = gtk_icon_theme_get_for_display (gtk_widget_get_display (self->owner));
  flags = get_icon_lookup_flags (self, style);
  if (preload)
    flags |= GTK_ICON_LOOKUP_PRELOAD;

  width = height = gtk_icon_helper_get_size (self);

  icon = gtk_icon_theme_lookup_by_gicon (icon_theme,
                                         gicon,
                                         MIN (width, height),
                                         dir,
                                         scale, flags);

  *symbolic = gtk_icon_paintable_is_symbolic (icon);
  return GDK_PAINTABLE (icon);
}

static GdkPaintable *
gtk_icon_helper_load_paintable (GtkIconHelper   *self,
                                gboolean         preload,
                                gboolean        *out_symbolic)
{
  GdkPaintable *paintable;
  GIcon *gicon;
  gboolean symbolic;

  switch (gtk_image_definition_get_storage_type (self->def))
    {
    case GTK_IMAGE_PAINTABLE:
      paintable = g_object_ref (gtk_image_definition_get_paintable (self->def));
      symbolic = FALSE;
      break;

    case GTK_IMAGE_ICON_NAME:
      if (self->use_fallback)
        gicon = g_themed_icon_new_with_default_fallbacks (gtk_image_definition_get_icon_name (self->def));
      else
        gicon = g_themed_icon_new (gtk_image_definition_get_icon_name (self->def));
      paintable = ensure_paintable_for_gicon (self,
                                              gtk_css_node_get_style (self->node),
                                              gtk_widget_get_scale_factor (self->owner),
                                              gtk_widget_get_direction (self->owner),
                                              preload,
                                              gicon,
                                              &symbolic);
      g_object_unref (gicon);
      break;

    case GTK_IMAGE_GICON:
      paintable = ensure_paintable_for_gicon (self,
                                              gtk_css_node_get_style (self->node),
                                              gtk_widget_get_scale_factor (self->owner),
                                              gtk_widget_get_direction (self->owner),
                                              preload,
                                              gtk_image_definition_get_gicon (self->def),
                                              &symbolic);
      break;

    case GTK_IMAGE_EMPTY:
    default:
      paintable = NULL;
      symbolic = FALSE;
      break;
    }

  *out_symbolic = symbolic;

  return paintable;
}

static void
gtk_icon_helper_ensure_paintable (GtkIconHelper *self, gboolean preload)
{
  gboolean symbolic;

  if (self->paintable)
    return;

  self->paintable = gtk_icon_helper_load_paintable (self, preload, &symbolic);
  self->texture_is_symbolic = symbolic;
}

static void
gtk_icon_helper_paintable_snapshot (GdkPaintable *paintable,
                                    GdkSnapshot  *snapshot,
                                    double        width,
                                    double        height)
{
  GtkIconHelper *self = GTK_ICON_HELPER (paintable);
  GtkCssStyle *style;

  style = gtk_css_node_get_style (self->node);

  gtk_icon_helper_ensure_paintable (self, FALSE);
  if (self->paintable == NULL)
    return;

  switch (gtk_image_definition_get_storage_type (self->def))
    {
    case GTK_IMAGE_ICON_NAME:
    case GTK_IMAGE_GICON:
      {
        double x, y, w, h;

        /* Never scale up icons. */
        w = gdk_paintable_get_intrinsic_width (self->paintable);
        h = gdk_paintable_get_intrinsic_height (self->paintable);
        w = MIN (w, width);
        h = MIN (h, height);
        x = (width - w) / 2;
        y = (height - h) / 2;

        if (w == 0 || h == 0)
          return;

        if (x  != 0 || y != 0)
          {
            gtk_snapshot_save (snapshot);
            gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
            gtk_css_style_snapshot_icon_paintable (style,
                                                   snapshot,
                                                   self->paintable,
                                                   w, h);
            gtk_snapshot_restore (snapshot);
          }
        else
          {
            gtk_css_style_snapshot_icon_paintable (style,
                                                   snapshot,
                                                   self->paintable,
                                                   w, h);

          }

      }
      break;

    case GTK_IMAGE_EMPTY:
      break;

    case GTK_IMAGE_PAINTABLE:
    default:
      {
        double image_ratio = (double) width / height;
        double ratio;
        double x, y, w, h;

        if (self->paintable == NULL)
          break;

        ratio = gdk_paintable_get_intrinsic_aspect_ratio (self->paintable);
        if (ratio == 0)
          {
            w = width;
            h = height;
          }
        else if (ratio > image_ratio)
          {
            w = width;
            h = width / ratio;
          }
        else
          {
            w = height * ratio;
            h = height;
          }

        x = floor (width - ceil (w)) / 2;
        y = floor (height - ceil (h)) / 2;

        if (x != 0 || y != 0)
          {
            gtk_snapshot_save (snapshot);
            gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
            gtk_css_style_snapshot_icon_paintable (style,
                                                   snapshot,
                                                   self->paintable,
                                                   w, h);
            gtk_snapshot_restore (snapshot);
          }
        else
          {
            gtk_css_style_snapshot_icon_paintable (style,
                                                   snapshot,
                                                   self->paintable,
                                                   w, h);
          }
      }
      break;
    }
}

static GdkPaintable *
gtk_icon_helper_paintable_get_current_image (GdkPaintable *paintable)
{
  GtkIconHelper *self = GTK_ICON_HELPER (paintable);

  gtk_icon_helper_ensure_paintable (self, FALSE);
  if (self->paintable == NULL)
    return NULL;

  return gtk_icon_helper_paintable_get_current_image (self->paintable);
}

static int
gtk_icon_helper_paintable_get_intrinsic_width (GdkPaintable *paintable)
{
  GtkIconHelper *self = GTK_ICON_HELPER (paintable);

  return gtk_icon_helper_get_size (self);
}

static int
gtk_icon_helper_paintable_get_intrinsic_height (GdkPaintable *paintable)
{
  GtkIconHelper *self = GTK_ICON_HELPER (paintable);

  return gtk_icon_helper_get_size (self);
}

static double gtk_icon_helper_paintable_get_intrinsic_aspect_ratio (GdkPaintable *paintable)
{
  return 1.0;
};

static void
gtk_icon_helper_paintable_init (GdkPaintableInterface *iface)
{
  iface->snapshot = gtk_icon_helper_paintable_snapshot;
  iface->get_current_image = gtk_icon_helper_paintable_get_current_image;
  iface->get_intrinsic_width = gtk_icon_helper_paintable_get_intrinsic_width;
  iface->get_intrinsic_height = gtk_icon_helper_paintable_get_intrinsic_height;
  iface->get_intrinsic_aspect_ratio = gtk_icon_helper_paintable_get_intrinsic_aspect_ratio;
}

G_DEFINE_TYPE_WITH_CODE (GtkIconHelper, gtk_icon_helper, G_TYPE_OBJECT,
			 G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
						gtk_icon_helper_paintable_init))

void
gtk_icon_helper_invalidate (GtkIconHelper *self)
{
  g_clear_object (&self->paintable);
  self->texture_is_symbolic = FALSE;

  if (!GTK_IS_CSS_TRANSIENT_NODE (self->node))
    gtk_widget_queue_resize (self->owner);
}

void
gtk_icon_helper_invalidate_for_change (GtkIconHelper     *self,
                                       GtkCssStyleChange *change)
{
  if (change == NULL ||
      gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_ICON_TEXTURE))
    {
      /* Avoid the queue_resize in gtk_icon_helper_invalidate */
      g_clear_object (&self->paintable);
      self->texture_is_symbolic = FALSE;
      gtk_widget_queue_draw (self->owner);
    }

  if (change == NULL ||
      gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_ICON_SIZE))
    {
      gtk_widget_queue_resize (self->owner);
    }
  else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_ICON_REDRAW) ||
           (self->texture_is_symbolic &&
            gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_ICON_REDRAW_SYMBOLIC)))
    {
      gtk_widget_queue_draw (self->owner);
    }

  /* The css size is valid now, preload */
  gtk_icon_helper_ensure_paintable (self, TRUE);
}

static void
gtk_icon_helper_take_definition (GtkIconHelper      *self,
                                 GtkImageDefinition *def)
{
  _gtk_icon_helper_clear (self);

  if (def == NULL)
    return;

  gtk_image_definition_unref (self->def);
  self->def = def;

  gtk_icon_helper_invalidate (self);
}

void
_gtk_icon_helper_clear (GtkIconHelper *self)
{
  g_clear_object (&self->paintable);
  self->texture_is_symbolic = FALSE;

  if (gtk_image_definition_get_storage_type (self->def) != GTK_IMAGE_EMPTY)
    {
      gtk_image_definition_unref (self->def);
      self->def = gtk_image_definition_new_empty ();
      gtk_icon_helper_invalidate (self);
    }
}

static void
gtk_icon_helper_finalize (GObject *object)
{
  GtkIconHelper *self = GTK_ICON_HELPER (object);

  _gtk_icon_helper_clear (self);
  g_signal_handlers_disconnect_by_func (self->owner, G_CALLBACK (gtk_icon_helper_invalidate), self);
  gtk_image_definition_unref (self->def);

  G_OBJECT_CLASS (gtk_icon_helper_parent_class)->finalize (object);
}

void
gtk_icon_helper_class_init (GtkIconHelperClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

  gobject_class->finalize = gtk_icon_helper_finalize;
}

void
gtk_icon_helper_init (GtkIconHelper *self)
{
  self->def = gtk_image_definition_new_empty ();
}

GtkIconHelper *
gtk_icon_helper_new (GtkCssNode *css_node,
                     GtkWidget  *owner)
{
  GtkIconHelper *self;
  
  self = g_object_new (GTK_TYPE_ICON_HELPER, NULL);

  self->pixel_size = -1;
  self->texture_is_symbolic = FALSE;

  self->node = css_node;
  self->owner = owner;
  g_signal_connect_swapped (owner, "direction-changed", G_CALLBACK (gtk_icon_helper_invalidate), self);
  g_signal_connect_swapped (owner, "notify::scale-factor", G_CALLBACK (gtk_icon_helper_invalidate), self);

  return self;
}

int
gtk_icon_helper_get_size (GtkIconHelper *self)
{
  GtkCssStyle *style;

  if (self->pixel_size != -1)
    return self->pixel_size;

  style = gtk_css_node_get_style (self->node);
  return _gtk_css_number_value_get (style->icon->icon_size, 100);
}

void
_gtk_icon_helper_set_definition (GtkIconHelper *self,
                                 GtkImageDefinition *def)
{
  if (def)
    gtk_icon_helper_take_definition (self, gtk_image_definition_ref (def));
  else
    _gtk_icon_helper_clear (self);
}

void
_gtk_icon_helper_set_gicon (GtkIconHelper *self,
                            GIcon         *gicon)
{
  gtk_icon_helper_take_definition (self, gtk_image_definition_new_gicon (gicon));
}

void
_gtk_icon_helper_set_icon_name (GtkIconHelper *self,
                                const gchar   *icon_name)
{
  gtk_icon_helper_take_definition (self, gtk_image_definition_new_icon_name (icon_name));
}

void
_gtk_icon_helper_set_paintable (GtkIconHelper *self,
			        GdkPaintable  *paintable)
{
  gtk_icon_helper_take_definition (self, gtk_image_definition_new_paintable (paintable));
}

gboolean
_gtk_icon_helper_set_pixel_size (GtkIconHelper *self,
                                 int            pixel_size)
{
  if (self->pixel_size != pixel_size)
    {
      self->pixel_size = pixel_size;
      gtk_icon_helper_invalidate (self);
      return TRUE;
    }
  return FALSE;
}

gboolean
_gtk_icon_helper_set_use_fallback (GtkIconHelper *self,
                                   gboolean       use_fallback)
{
  if (self->use_fallback != use_fallback)
    {
      self->use_fallback = use_fallback;
      gtk_icon_helper_invalidate (self);
      return TRUE;
    }
  return FALSE;
}

GtkImageType
_gtk_icon_helper_get_storage_type (GtkIconHelper *self)
{
  return gtk_image_definition_get_storage_type (self->def);
}

gboolean
_gtk_icon_helper_get_use_fallback (GtkIconHelper *self)
{
  return self->use_fallback;
}

int
_gtk_icon_helper_get_pixel_size (GtkIconHelper *self)
{
  return self->pixel_size;
}

GtkImageDefinition *
gtk_icon_helper_get_definition (GtkIconHelper *self)
{
  return self->def;
}

GIcon *
_gtk_icon_helper_peek_gicon (GtkIconHelper *self)
{
  return gtk_image_definition_get_gicon (self->def);
}

GdkPaintable *
_gtk_icon_helper_peek_paintable (GtkIconHelper *self)
{
  return gtk_image_definition_get_paintable (self->def);
}

const gchar *
_gtk_icon_helper_get_icon_name (GtkIconHelper *self)
{
  return gtk_image_definition_get_icon_name (self->def);
}

gboolean
_gtk_icon_helper_get_is_empty (GtkIconHelper *self)
{
  return gtk_image_definition_get_storage_type (self->def) == GTK_IMAGE_EMPTY;
}

void
gtk_icon_size_set_style_classes (GtkCssNode  *cssnode,
                                 GtkIconSize  icon_size)
{
  struct {
    GtkIconSize icon_size;
    const char *class_name;
  } class_names[] = {
    { GTK_ICON_SIZE_NORMAL, "normal-icons" },
    { GTK_ICON_SIZE_LARGE, "large-icons" }
  };
  guint i;

  for (i = 0; i < G_N_ELEMENTS (class_names); i++)
    {
      if (icon_size == class_names[i].icon_size)
        gtk_css_node_add_class (cssnode, g_quark_from_static_string (class_names[i].class_name));
      else
        gtk_css_node_remove_class (cssnode, g_quark_from_static_string (class_names[i].class_name));
    }
}