gdkcolor.c 18.5 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
15
16
17
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
18
19
20
21
22
23
24
25
26
27
28
29
30
31
 */
#include <X11/Xlib.h>
#include "gdk.h"
#include "gdkprivate.h"


static gint  gdk_colormap_match_color (GdkColormap *cmap,
				       GdkColor    *color,
				       const gchar *available);
static void  gdk_colormap_add         (GdkColormap *cmap);
static void  gdk_colormap_remove      (GdkColormap *cmap);
static guint gdk_colormap_hash        (Colormap    *cmap);
static gint  gdk_colormap_cmp         (Colormap    *a,
				       Colormap    *b);
32
static void gdk_colormap_real_destroy (GdkColormap *colormap);
Elliot Lee's avatar
Elliot Lee committed
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

static GHashTable *colormap_hash = NULL;


GdkColormap*
gdk_colormap_new (GdkVisual *visual,
		  gint       private_cmap)
{
  GdkColormap *colormap;
  GdkColormapPrivate *private;
  Visual *xvisual;
  int size;
  int i;

  g_return_val_if_fail (visual != NULL, NULL);

  private = g_new (GdkColormapPrivate, 1);
  colormap = (GdkColormap*) private;

  private->xdisplay = gdk_display;
  private->visual = visual;
  private->next_color = 0;
  private->ref_count = 1;
  xvisual = ((GdkVisualPrivate*) visual)->xvisual;

58
59
60
  colormap->size = visual->colormap_size;
  colormap->colors = g_new (GdkColor, colormap->size);

Elliot Lee's avatar
Elliot Lee committed
61
62
63
64
65
66
67
68
69
70
  switch (visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      private->private_val = private_cmap;
      private->xcolormap = XCreateColormap (private->xdisplay, gdk_root_window,
					    xvisual, (private_cmap) ? (AllocAll) : (AllocNone));

      if (private_cmap)
	{
71
72
73
74
75
	  XColor *default_colors;

	  default_colors = g_new (XColor, colormap->size);

	  for (i = 0; i < colormap->size; i++)
Elliot Lee's avatar
Elliot Lee committed
76
77
78
79
	    default_colors[i].pixel = i;

	  XQueryColors (private->xdisplay,
			DefaultColormap (private->xdisplay, gdk_screen),
80
			default_colors, colormap->size);
Elliot Lee's avatar
Elliot Lee committed
81

82
	  for (i = 0; i < colormap->size; i++)
Elliot Lee's avatar
Elliot Lee committed
83
84
85
86
87
88
89
	    {
	      colormap->colors[i].pixel = default_colors[i].pixel;
	      colormap->colors[i].red = default_colors[i].red;
	      colormap->colors[i].green = default_colors[i].green;
	      colormap->colors[i].blue = default_colors[i].blue;
	    }

90
91
92
	  gdk_colormap_change (colormap, colormap->size);
	  
	  g_free (default_colors);
Elliot Lee's avatar
Elliot Lee committed
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
	}
      break;

    case GDK_VISUAL_DIRECT_COLOR:
      private->private_val = TRUE;
      private->xcolormap = XCreateColormap (private->xdisplay, gdk_root_window,
					    xvisual, AllocAll);

      size = 1 << visual->red_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].red = i * 65535 / (size - 1);

      size = 1 << visual->green_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].green = i * 65535 / (size - 1);

      size = 1 << visual->blue_prec;
      for (i = 0; i < size; i++)
	colormap->colors[i].blue = i * 65535 / (size - 1);

113
      gdk_colormap_change (colormap, colormap->size);
Elliot Lee's avatar
Elliot Lee committed
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
      break;

    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
    case GDK_VISUAL_TRUE_COLOR:
      private->private_val = FALSE;
      private->xcolormap = XCreateColormap (private->xdisplay, gdk_root_window,
					    xvisual, AllocNone);
      break;
    }

  gdk_colormap_add (colormap);

  return colormap;
}

130
static void
Elliot Lee's avatar
Elliot Lee committed
131
132
133
134
135
136
137
138
139
140
141
gdk_colormap_real_destroy (GdkColormap *colormap)
{
  GdkColormapPrivate *private = (GdkColormapPrivate*) colormap;

  g_return_if_fail (colormap != NULL);

  if (private->ref_count > 0)
    return;

  gdk_colormap_remove (colormap);
  XFreeColormap (private->xdisplay, private->xcolormap);
142
  g_free (colormap->colors);
Elliot Lee's avatar
Elliot Lee committed
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
  g_free (colormap);
}

GdkColormap*
gdk_colormap_ref (GdkColormap *cmap)
{
  GdkColormapPrivate *private = (GdkColormapPrivate *)cmap;
  g_return_val_if_fail (cmap != NULL, NULL);

  private->ref_count += 1;
  return cmap;
}

void
gdk_colormap_unref (GdkColormap *cmap)
{
  GdkColormapPrivate *private = (GdkColormapPrivate *)cmap;
  g_return_if_fail (cmap != NULL);

  private->ref_count -= 1;
  if (private->ref_count == 0)
    gdk_colormap_real_destroy (cmap);
}

GdkColormap*
gdk_colormap_get_system (void)
{
  static GdkColormap *colormap = NULL;
  GdkColormapPrivate *private;
172
  XColor *xpalette;
Elliot Lee's avatar
Elliot Lee committed
173
174
175
176
177
178
179
180
181
182
183
184
185
186
  gint i;

  if (!colormap)
    {
      private = g_new (GdkColormapPrivate, 1);
      colormap = (GdkColormap*) private;

      private->xdisplay = gdk_display;
      private->xcolormap = DefaultColormap (gdk_display, gdk_screen);
      private->visual = gdk_visual_get_system ();
      private->private_val = FALSE;
      private->next_color = 0;
      private->ref_count = 1;

187
188
189
      colormap->size = private->visual->colormap_size;
      colormap->colors = g_new (GdkColor, colormap->size);

190
191
      if ((private->visual->type == GDK_VISUAL_GRAYSCALE) ||
	  (private->visual->type == GDK_VISUAL_PSEUDO_COLOR))
Elliot Lee's avatar
Elliot Lee committed
192
	{
193
194
195
	  xpalette = g_new (XColor, colormap->size);
	  
	  for (i = 0; i < colormap->size; i++)
196
197
198
199
200
201
202
203
	    {
	      xpalette[i].pixel = i;
	      xpalette[i].red = 0;
	      xpalette[i].green = 0;
	      xpalette[i].blue = 0;
	    }
	  
	  XQueryColors (gdk_display, private->xcolormap, xpalette, 
204
			colormap->size);
205
	  
206
	  for (i = 0; i < colormap->size; i++)
207
208
209
210
211
212
	    {
	      colormap->colors[i].pixel = xpalette[i].pixel;
	      colormap->colors[i].red = xpalette[i].red;
	      colormap->colors[i].green = xpalette[i].green;
	      colormap->colors[i].blue = xpalette[i].blue;
	    }
213
214

	  g_free (xpalette);
Elliot Lee's avatar
Elliot Lee committed
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
	}

      gdk_colormap_add (colormap);
    }

  return colormap;
}

gint
gdk_colormap_get_system_size (void)
{
  return DisplayCells (gdk_display, gdk_screen);
}

void
gdk_colormap_change (GdkColormap *colormap,
		     gint         ncolors)
{
  GdkColormapPrivate *private;
  GdkVisual *visual;
235
  XColor *palette;
Elliot Lee's avatar
Elliot Lee committed
236
237
238
239
240
241
242
  gint shift;
  int max_colors;
  int size;
  int i;

  g_return_if_fail (colormap != NULL);

243
244
  palette = g_new (XColor, ncolors);

Elliot Lee's avatar
Elliot Lee committed
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
  private = (GdkColormapPrivate*) colormap;
  switch (private->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      for (i = 0; i < ncolors; i++)
	{
	  palette[i].pixel = colormap->colors[i].pixel;
	  palette[i].red = colormap->colors[i].red;
	  palette[i].green = colormap->colors[i].green;
	  palette[i].blue = colormap->colors[i].blue;
	  palette[i].flags = DoRed | DoGreen | DoBlue;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, ncolors);
      private->next_color = MAX (private->next_color, ncolors);
      break;

    case GDK_VISUAL_DIRECT_COLOR:
      visual = private->visual;

      shift = visual->red_shift;
      max_colors = 1 << visual->red_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].red = colormap->colors[i].red;
	  palette[i].flags = DoRed;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, size);

      shift = visual->green_shift;
      max_colors = 1 << visual->green_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].green = colormap->colors[i].green;
	  palette[i].flags = DoGreen;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, size);

      shift = visual->blue_shift;
      max_colors = 1 << visual->blue_prec;
      size = (ncolors < max_colors) ? (ncolors) : (max_colors);

      for (i = 0; i < size; i++)
	{
	  palette[i].pixel = i << shift;
	  palette[i].blue = colormap->colors[i].blue;
	  palette[i].flags = DoBlue;
	}

      XStoreColors (private->xdisplay, private->xcolormap, palette, size);
      break;

    default:
      break;
    }
309
310

  g_free (palette);
Elliot Lee's avatar
Elliot Lee committed
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
}

void
gdk_colors_store (GdkColormap   *colormap,
		  GdkColor      *colors,
		  gint           ncolors)
{
  gint i;

  for (i = 0; i < ncolors; i++)
    {
      colormap->colors[i].pixel = colors[i].pixel;
      colormap->colors[i].red = colors[i].red;
      colormap->colors[i].green = colors[i].green;
      colormap->colors[i].blue = colors[i].blue;
    }

  gdk_colormap_change (colormap, ncolors);
}

331
gboolean
Elliot Lee's avatar
Elliot Lee committed
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
gdk_colors_alloc (GdkColormap   *colormap,
		  gint           contiguous,
		  gulong        *planes,
		  gint           nplanes,
		  gulong        *pixels,
		  gint           npixels)
{
  GdkColormapPrivate *private;
  gint return_val;

  g_return_val_if_fail (colormap != NULL, 0);

  private = (GdkColormapPrivate*) colormap;

  return_val = XAllocColorCells (private->xdisplay, private->xcolormap,
				 contiguous, planes, nplanes, pixels, npixels);

  return return_val;
}

void
gdk_colors_free (GdkColormap *colormap,
		 gulong      *pixels,
		 gint         npixels,
		 gulong       planes)
{
  GdkColormapPrivate *private;

  g_return_if_fail (colormap != NULL);

  private = (GdkColormapPrivate*) colormap;

  XFreeColors (private->xdisplay, private->xcolormap,
	       pixels, npixels, planes);
}

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
/*
 *--------------------------------------------------------------
 * gdk_color_copy
 *
 *   Copy a color structure into new storage.
 *
 * Arguments:
 *   "color" is the color struct to copy.
 *
 * Results:
 *   A new color structure.  Free it with gdk_color_free.
 *
 *--------------------------------------------------------------
 */

static GMemChunk *color_chunk;

GdkColor*
gdk_color_copy (GdkColor *color)
{
  GdkColor *new_color;
  
  g_return_val_if_fail (color != NULL, NULL);

  if (color_chunk == NULL)
    color_chunk = g_mem_chunk_new ("colors",
				   sizeof (GdkColor),
				   4096,
				   G_ALLOC_AND_FREE);

  new_color = g_chunk_new (GdkColor, color_chunk);
  *new_color = *color;
  return new_color;
}

/*
 *--------------------------------------------------------------
 * gdk_color_free
 *
 *   Free a color structure obtained from gdk_color_copy.  Do not use
 *   with other color structures.
 *
 * Arguments:
 *   "color" is the color struct to free.
 *
 *-------------------------------------------------------------- */

void
gdk_color_free (GdkColor *color)
{
  g_assert (color_chunk != NULL);
  g_return_if_fail (color != NULL);

  g_mem_chunk_free (color_chunk, color);
}

Elliot Lee's avatar
Elliot Lee committed
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
gint
gdk_color_white (GdkColormap *colormap,
		 GdkColor    *color)
{
  gint return_val;

  g_return_val_if_fail (colormap != NULL, FALSE);

  if (color)
    {
      color->pixel = WhitePixel (gdk_display, gdk_screen);
      color->red = 65535;
      color->green = 65535;
      color->blue = 65535;

      return_val = gdk_color_alloc (colormap, color);
    }
  else
    return_val = FALSE;

  return return_val;
}

gint
gdk_color_black (GdkColormap *colormap,
		 GdkColor    *color)
{
  gint return_val;

  g_return_val_if_fail (colormap != NULL, FALSE);

  if (color)
    {
      color->pixel = BlackPixel (gdk_display, gdk_screen);
      color->red = 0;
      color->green = 0;
      color->blue = 0;

      return_val = gdk_color_alloc (colormap, color);
    }
  else
    return_val = FALSE;

  return return_val;
}

470
gboolean
Elliot Lee's avatar
Elliot Lee committed
471
472
473
474
475
gdk_color_parse (const gchar *spec,
		 GdkColor *color)
{
  Colormap xcolormap;
  XColor xcolor;
476
  gboolean return_val;
Elliot Lee's avatar
Elliot Lee committed
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495

  g_return_val_if_fail (spec != NULL, FALSE);
  g_return_val_if_fail (color != NULL, FALSE);

  xcolormap = DefaultColormap (gdk_display, gdk_screen);

  if (XParseColor (gdk_display, xcolormap, spec, &xcolor))
    {
      return_val = TRUE;
      color->red = xcolor.red;
      color->green = xcolor.green;
      color->blue = xcolor.blue;
    }
  else
    return_val = FALSE;

  return return_val;
}

496
gboolean
Elliot Lee's avatar
Elliot Lee committed
497
498
499
500
501
502
gdk_color_alloc (GdkColormap *colormap,
		 GdkColor    *color)
{
  GdkColormapPrivate *private;
  GdkVisual *visual;
  XColor xcolor;
503
  gchar *available = NULL;
504
  gboolean return_val;
Elliot Lee's avatar
Elliot Lee committed
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
  gint i, index;

  g_return_val_if_fail (colormap != NULL, FALSE);
  g_return_val_if_fail (color != NULL, FALSE);

  xcolor.red = color->red;
  xcolor.green = color->green;
  xcolor.blue = color->blue;
  xcolor.pixel = color->pixel;
  xcolor.flags = DoRed | DoGreen | DoBlue;

  return_val = FALSE;
  private = (GdkColormapPrivate*) colormap;

  switch (private->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      if (private->private_val)
	{
525
	  if (private->next_color >= colormap->size)
Elliot Lee's avatar
Elliot Lee committed
526
	    {
527
528
	      available = g_new (gchar, colormap->size);
	      for (i = 0; i < colormap->size; i++)
Elliot Lee's avatar
Elliot Lee committed
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
		available[i] = TRUE;

	      index = gdk_colormap_match_color (colormap, color, available);
	      if (index != -1)
		{
		  available[index] = FALSE;
		  *color = colormap->colors[index];
		  return_val = TRUE;
		}
	      else
		{
		  return_val = FALSE;
		}
	    }
	  else
	    {
545
	      xcolor.pixel = colormap->size - 1 -private->next_color;
Elliot Lee's avatar
Elliot Lee committed
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
	      color->pixel = xcolor.pixel;
	      private->next_color += 1;

	      XStoreColor (private->xdisplay, private->xcolormap, &xcolor);
	      return_val = TRUE;
	    }
	}
      else
	{
	  while (1)
	    {
	      if (XAllocColor (private->xdisplay, private->xcolormap, &xcolor))
		{
		  color->pixel = xcolor.pixel;
		  color->red = xcolor.red;
		  color->green = xcolor.green;
		  color->blue = xcolor.blue;

564
565
		  if (color->pixel < colormap->size)
		    colormap->colors[color->pixel] = *color;
Elliot Lee's avatar
Elliot Lee committed
566
567
568
569
570
571

		  return_val = TRUE;
		  break;
		}
	      else
		{
572
		  if (available == NULL)
Elliot Lee's avatar
Elliot Lee committed
573
		    {
574
575
		      available = g_new (gchar, colormap->size);
		      for (i = 0; i < colormap->size; i++)
Elliot Lee's avatar
Elliot Lee committed
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
			available[i] = TRUE;
		    }

		  index = gdk_colormap_match_color (colormap, color, available);
		  if (index != -1)
		    {
		      available[index] = FALSE;
		      xcolor.red = colormap->colors[index].red;
		      xcolor.green = colormap->colors[index].green;
		      xcolor.blue = colormap->colors[index].blue;
		    }
		  else
		    {
		      return_val = FALSE;
		      break;
		    }
		}
	    }
	}
      break;

    case GDK_VISUAL_DIRECT_COLOR:
      visual = private->visual;
      xcolor.pixel = (((xcolor.red >> (16 - visual->red_prec)) << visual->red_shift) +
		      ((xcolor.green >> (16 - visual->green_prec)) << visual->green_shift) +
		      ((xcolor.blue >> (16 - visual->blue_prec)) << visual->blue_shift));
      color->pixel = xcolor.pixel;
      return_val = TRUE;
      break;

    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
    case GDK_VISUAL_TRUE_COLOR:
      if (XAllocColor (private->xdisplay, private->xcolormap, &xcolor))
	{
	  color->pixel = xcolor.pixel;
	  return_val = TRUE;
	}
      else
	return_val = FALSE;
      break;
    }

619
620
621
  if (available)
    g_free (available);
  
Elliot Lee's avatar
Elliot Lee committed
622
623
624
  return return_val;
}

625
gboolean
Elliot Lee's avatar
Elliot Lee committed
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
gdk_color_change (GdkColormap *colormap,
		  GdkColor    *color)
{
  GdkColormapPrivate *private;
  XColor xcolor;

  g_return_val_if_fail (colormap != NULL, FALSE);
  g_return_val_if_fail (color != NULL, FALSE);

  xcolor.pixel = color->pixel;
  xcolor.red = color->red;
  xcolor.green = color->green;
  xcolor.blue = color->blue;
  xcolor.flags = DoRed | DoGreen | DoBlue;

  private = (GdkColormapPrivate*) colormap;
  XStoreColor (private->xdisplay, private->xcolormap, &xcolor);

  return TRUE;
}

gint
gdk_color_equal (GdkColor *colora,
		 GdkColor *colorb)
{
  g_return_val_if_fail (colora != NULL, FALSE);
  g_return_val_if_fail (colorb != NULL, FALSE);

  return ((colora->red == colorb->red) &&
	  (colora->green == colorb->green) &&
	  (colora->blue == colorb->blue));
}

GdkColormap*
gdkx_colormap_get (Colormap xcolormap)
{
  GdkColormap *colormap;
  GdkColormapPrivate *private;

  colormap = gdk_colormap_lookup (xcolormap);
  if (colormap)
    return colormap;

  if (xcolormap == DefaultColormap (gdk_display, gdk_screen))
    return gdk_colormap_get_system ();

  private = g_new (GdkColormapPrivate, 1);
  colormap = (GdkColormap*) private;

  private->xdisplay = gdk_display;
  private->xcolormap = xcolormap;
  private->visual = NULL;
  private->private_val = TRUE;
  private->next_color = 0;

681
682
683
684
685
686
  /* To do the following safely, we would have to have some way of finding
   * out what the size or visual of the given colormap is. It seems
   * X doesn't allow this
   */

#if 0
Elliot Lee's avatar
Elliot Lee committed
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
  for (i = 0; i < 256; i++)
    {
      xpalette[i].pixel = i;
      xpalette[i].red = 0;
      xpalette[i].green = 0;
      xpalette[i].blue = 0;
    }

  XQueryColors (gdk_display, private->xcolormap, xpalette, 256);

  for (i = 0; i < 256; i++)
    {
      colormap->colors[i].pixel = xpalette[i].pixel;
      colormap->colors[i].red = xpalette[i].red;
      colormap->colors[i].green = xpalette[i].green;
      colormap->colors[i].blue = xpalette[i].blue;
    }
704
705
706
707
#endif

  colormap->colors = NULL;
  colormap->size = 0;
Elliot Lee's avatar
Elliot Lee committed
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731

  gdk_colormap_add (colormap);

  return colormap;
}


static gint
gdk_colormap_match_color (GdkColormap *cmap,
			  GdkColor    *color,
			  const gchar *available)
{
  GdkColor *colors;
  guint sum, max;
  gint rdiff, gdiff, bdiff;
  gint i, index;

  g_return_val_if_fail (cmap != NULL, 0);
  g_return_val_if_fail (color != NULL, 0);

  colors = cmap->colors;
  max = 3 * (65536);
  index = -1;

732
  for (i = 0; i < cmap->size; i++)
Elliot Lee's avatar
Elliot Lee committed
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
    {
      if ((!available) || (available && available[i]))
	{
	  rdiff = (color->red - colors[i].red);
	  gdiff = (color->green - colors[i].green);
	  bdiff = (color->blue - colors[i].blue);

	  sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);

	  if (sum < max)
	    {
	      index = i;
	      max = sum;
	    }
	}
    }

  return index;
}


GdkColormap*
gdk_colormap_lookup (Colormap xcolormap)
{
  GdkColormap *cmap;

  if (!colormap_hash)
    return NULL;

  cmap = g_hash_table_lookup (colormap_hash, &xcolormap);
  return cmap;
}

static void
gdk_colormap_add (GdkColormap *cmap)
{
  GdkColormapPrivate *private;

  if (!colormap_hash)
    colormap_hash = g_hash_table_new ((GHashFunc) gdk_colormap_hash,
				      (GCompareFunc) gdk_colormap_cmp);

  private = (GdkColormapPrivate*) cmap;

  g_hash_table_insert (colormap_hash, &private->xcolormap, cmap);
}

static void
gdk_colormap_remove (GdkColormap *cmap)
{
  GdkColormapPrivate *private;

  if (!colormap_hash)
    colormap_hash = g_hash_table_new ((GHashFunc) gdk_colormap_hash,
				      (GCompareFunc) gdk_colormap_cmp);

  private = (GdkColormapPrivate*) cmap;

  g_hash_table_remove (colormap_hash, &private->xcolormap);
}

static guint
gdk_colormap_hash (Colormap *cmap)
{
  return *cmap;
}

static gint
gdk_colormap_cmp (Colormap *a,
		  Colormap *b)
{
  return (*a == *b);
}