gtkcsscolorvalue.c 22.9 KB
Newer Older
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
/* GTK - The GIMP Toolkit
 * Copyright (C) 2010 Carlos Garnacho <carlosg@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 "gtkcsscolorvalueprivate.h"

#include "gtkcssrgbavalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkhslaprivate.h"
#include "gtkstylepropertyprivate.h"
#include "gtkwin32themeprivate.h"

typedef enum {
  COLOR_TYPE_LITERAL,
  COLOR_TYPE_NAME,
  COLOR_TYPE_SHADE,
  COLOR_TYPE_ALPHA,
  COLOR_TYPE_MIX,
  COLOR_TYPE_WIN32,
  COLOR_TYPE_CURRENT_COLOR
} ColorType;

struct _GtkCssValue
{
  GTK_CSS_VALUE_BASE
  ColorType type;
  GtkCssValue *last_value;

  union
  {
    gchar *name;

    struct
    {
      GtkCssValue *color;
      gdouble factor;
    } shade, alpha;

    struct
    {
      GtkCssValue *color1;
      GtkCssValue *color2;
      gdouble factor;
    } mix;

    struct
    {
      gchar *theme_class;
      gint id;
    } win32;
  } sym_col;
};

static void
gtk_css_value_color_free (GtkCssValue *color)
{
  if (color->last_value)
    _gtk_css_value_unref (color->last_value);

  switch (color->type)
    {
    case COLOR_TYPE_NAME:
      g_free (color->sym_col.name);
      break;
    case COLOR_TYPE_SHADE:
      _gtk_css_value_unref (color->sym_col.shade.color);
      break;
    case COLOR_TYPE_ALPHA:
      _gtk_css_value_unref (color->sym_col.alpha.color);
      break;
    case COLOR_TYPE_MIX:
      _gtk_css_value_unref (color->sym_col.mix.color1);
      _gtk_css_value_unref (color->sym_col.mix.color2);
      break;
    case COLOR_TYPE_WIN32:
      g_free (color->sym_col.win32.theme_class);
      break;
    default:
      break;
    }

  g_slice_free (GtkCssValue, color);
}

static GtkCssValue *
gtk_css_value_color_get_fallback (guint                    property_id,
                                  GtkStyleProviderPrivate *provider,
103 104
                                  GtkCssStyle             *style,
                                  GtkCssStyle             *parent_style)
105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
{
  static const GdkRGBA transparent = { 0, 0, 0, 0 };

  switch (property_id)
    {
      case GTK_CSS_PROPERTY_BACKGROUND_IMAGE:
      case GTK_CSS_PROPERTY_BORDER_IMAGE_SOURCE:
      case GTK_CSS_PROPERTY_TEXT_SHADOW:
      case GTK_CSS_PROPERTY_ICON_SHADOW:
      case GTK_CSS_PROPERTY_BOX_SHADOW:
        return _gtk_css_rgba_value_new_from_rgba (&transparent);
      case GTK_CSS_PROPERTY_COLOR:
      case GTK_CSS_PROPERTY_BACKGROUND_COLOR:
      case GTK_CSS_PROPERTY_BORDER_TOP_COLOR:
      case GTK_CSS_PROPERTY_BORDER_RIGHT_COLOR:
      case GTK_CSS_PROPERTY_BORDER_BOTTOM_COLOR:
      case GTK_CSS_PROPERTY_BORDER_LEFT_COLOR:
      case GTK_CSS_PROPERTY_OUTLINE_COLOR:
        return _gtk_css_value_compute (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (property_id)),
                                       property_id,
                                       provider,
126
                                       style,
127
                                       parent_style);
128 129 130 131 132 133 134 135
      default:
        if (property_id < GTK_CSS_PROPERTY_N_PROPERTIES)
          g_warning ("No fallback color defined for property '%s'", 
                     _gtk_style_property_get_name (GTK_STYLE_PROPERTY (_gtk_css_style_property_lookup_by_id (property_id))));
        return _gtk_css_rgba_value_new_from_rgba (&transparent);
    }
}

136 137 138 139
GtkCssValue *
_gtk_css_color_value_resolve (GtkCssValue             *color,
                              GtkStyleProviderPrivate *provider,
                              GtkCssValue             *current,
140
                              GSList                  *cycle_list)
141 142 143
{
  GtkCssValue *value;

144 145
  g_return_val_if_fail (color != NULL, NULL);
  g_return_val_if_fail (provider == NULL || GTK_IS_STYLE_PROVIDER_PRIVATE (provider), NULL);
146 147 148 149 150 151 152

  switch (color->type)
    {
    case COLOR_TYPE_LITERAL:
      return _gtk_css_value_ref (color->last_value);
    case COLOR_TYPE_NAME:
      {
153
	GtkCssValue *named;
154 155 156 157 158 159
        GSList cycle = { color, cycle_list };

        /* If color exists in cycle_list, we're currently resolving it.
         * So we've detected a cycle. */
        if (g_slist_find (cycle_list, color))
          return NULL;
160

161 162
        named = _gtk_style_provider_private_get_color (provider, color->sym_col.name);
	if (named == NULL)
163 164
	  return NULL;

165
        value = _gtk_css_color_value_resolve (named, provider, current, &cycle);
166 167
	if (value == NULL)
	  return NULL;
168 169 170 171 172 173 174 175 176
      }

      break;
    case COLOR_TYPE_SHADE:
      {
	GtkCssValue *val;
        GtkHSLA hsla;
	GdkRGBA shade;

177
	val = _gtk_css_color_value_resolve (color->sym_col.shade.color, provider, current, cycle_list);
178 179 180 181
	if (val == NULL)
	  return NULL;

        _gtk_hsla_init_from_rgba (&hsla, _gtk_css_rgba_value_get_rgba (val));
182
        _gtk_hsla_shade (&hsla, &hsla, color->sym_col.shade.factor);
183 184 185 186 187 188 189 190 191 192 193 194 195 196

        _gdk_rgba_init_from_hsla (&shade, &hsla);

	_gtk_css_value_unref (val);

	value = _gtk_css_rgba_value_new_from_rgba (&shade);
      }

      break;
    case COLOR_TYPE_ALPHA:
      {
	GtkCssValue *val;
	GdkRGBA alpha;

197
	val = _gtk_css_color_value_resolve (color->sym_col.alpha.color, provider, current, cycle_list);
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
	if (val == NULL)
	  return NULL;

	alpha = *_gtk_css_rgba_value_get_rgba (val);
	alpha.alpha = CLAMP (alpha.alpha * color->sym_col.alpha.factor, 0, 1);

	_gtk_css_value_unref (val);

	value = _gtk_css_rgba_value_new_from_rgba (&alpha);
      }
      break;

    case COLOR_TYPE_MIX:
      {
	GtkCssValue *val;
	GdkRGBA color1, color2, res;

215
	val = _gtk_css_color_value_resolve (color->sym_col.mix.color1, provider, current, cycle_list);
216 217 218 219 220
	if (val == NULL)
	  return NULL;
	color1 = *_gtk_css_rgba_value_get_rgba (val);
	_gtk_css_value_unref (val);

221
	val = _gtk_css_color_value_resolve (color->sym_col.mix.color2, provider, current, cycle_list);
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
	if (val == NULL)
	  return NULL;
	color2 = *_gtk_css_rgba_value_get_rgba (val);
	_gtk_css_value_unref (val);

	res.red = CLAMP (color1.red + ((color2.red - color1.red) * color->sym_col.mix.factor), 0, 1);
	res.green = CLAMP (color1.green + ((color2.green - color1.green) * color->sym_col.mix.factor), 0, 1);
	res.blue = CLAMP (color1.blue + ((color2.blue - color1.blue) * color->sym_col.mix.factor), 0, 1);
	res.alpha = CLAMP (color1.alpha + ((color2.alpha - color1.alpha) * color->sym_col.mix.factor), 0, 1);

	value =_gtk_css_rgba_value_new_from_rgba (&res);
      }

      break;
    case COLOR_TYPE_WIN32:
      {
	GdkRGBA res;

	if (!_gtk_win32_theme_color_resolve (color->sym_col.win32.theme_class,
					     color->sym_col.win32.id,
					     &res))
	  return NULL;

	value = _gtk_css_rgba_value_new_from_rgba (&res);
      }

      break;
    case COLOR_TYPE_CURRENT_COLOR:
      if (current)
        {
          return _gtk_css_value_ref (current);
        }
      else
        {
256 257 258 259
          return _gtk_css_color_value_resolve (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (GTK_CSS_PROPERTY_COLOR)),
                                               provider,
                                               NULL,
                                               cycle_list);
260 261 262
        }
      break;
    default:
263
      value = NULL;
264 265 266
      g_assert_not_reached ();
    }

267 268
  if (color->last_value != NULL &&
      _gtk_css_value_equal (color->last_value, value))
269
    {
270 271 272 273 274 275 276 277
      _gtk_css_value_unref (value);
      value = _gtk_css_value_ref (color->last_value);
    }
  else
    {
      if (color->last_value != NULL)
        _gtk_css_value_unref (color->last_value);
      color->last_value = _gtk_css_value_ref (value);
278 279 280 281 282 283 284 285 286
    }

  return value;
}

static GtkCssValue *
gtk_css_value_color_compute (GtkCssValue             *value,
                             guint                    property_id,
                             GtkStyleProviderPrivate *provider,
287
                             GtkCssStyle             *style,
288
                             GtkCssStyle             *parent_style)
289 290 291 292 293 294 295 296 297
{
  GtkCssValue *resolved, *current;

  /* The computed value of the ‘currentColor’ keyword is the computed
   * value of the ‘color’ property. If the ‘currentColor’ keyword is
   * set on the ‘color’ property itself, it is treated as ‘color: inherit’. 
   */
  if (property_id == GTK_CSS_PROPERTY_COLOR)
    {
298
      if (parent_style)
299
        current = gtk_css_style_get_value (parent_style, GTK_CSS_PROPERTY_COLOR);
300
      else
301
        current = NULL;
302 303 304
    }
  else
    {
305
      current = gtk_css_style_get_value (style, GTK_CSS_PROPERTY_COLOR);
306 307
    }
  
308 309 310
  resolved = _gtk_css_color_value_resolve (value,
                                           provider,
                                           current,
311
                                           NULL);
312 313

  if (resolved == NULL)
314
    return gtk_css_value_color_get_fallback (property_id, provider, style, parent_style);
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

  return resolved;
}

static gboolean
gtk_css_value_color_equal (const GtkCssValue *value1,
                           const GtkCssValue *value2)
{
  if (value1->type != value2->type)
    return FALSE;

  switch (value1->type)
    {
    case COLOR_TYPE_LITERAL:
      return _gtk_css_value_equal (value1->last_value, value2->last_value);
    case COLOR_TYPE_NAME:
      return g_str_equal (value1->sym_col.name, value2->sym_col.name);
    case COLOR_TYPE_SHADE:
      return value1->sym_col.shade.factor == value2->sym_col.shade.factor &&
             _gtk_css_value_equal (value1->sym_col.shade.color,
                                   value2->sym_col.shade.color);
    case COLOR_TYPE_ALPHA:
      return value1->sym_col.alpha.factor == value2->sym_col.alpha.factor &&
             _gtk_css_value_equal (value1->sym_col.alpha.color,
                                   value2->sym_col.alpha.color);
    case COLOR_TYPE_MIX:
      return value1->sym_col.mix.factor == value2->sym_col.mix.factor &&
             _gtk_css_value_equal (value1->sym_col.mix.color1,
                                   value2->sym_col.mix.color1) &&
             _gtk_css_value_equal (value1->sym_col.mix.color2,
                                   value2->sym_col.mix.color2);
    case COLOR_TYPE_WIN32:
      return g_str_equal (value1->sym_col.win32.theme_class, value2->sym_col.win32.theme_class) &&
             value1->sym_col.win32.id == value2->sym_col.win32.id;
    case COLOR_TYPE_CURRENT_COLOR:
      return TRUE;
    default:
      g_assert_not_reached ();
      return FALSE;
    }
}

static GtkCssValue *
gtk_css_value_color_transition (GtkCssValue *start,
                                GtkCssValue *end,
                                guint        property_id,
                                double       progress)
{
  return _gtk_css_color_value_new_mix (start, end, progress);
}

static void
gtk_css_value_color_print (const GtkCssValue *value,
                           GString           *string)
{
  switch (value->type)
    {
    case COLOR_TYPE_LITERAL:
      _gtk_css_value_print (value->last_value, string);
      break;
    case COLOR_TYPE_NAME:
      g_string_append (string, "@");
      g_string_append (string, value->sym_col.name);
      break;
    case COLOR_TYPE_SHADE:
      {
        char factor[G_ASCII_DTOSTR_BUF_SIZE];

        g_string_append (string, "shade(");
        _gtk_css_value_print (value->sym_col.shade.color, string);
        g_string_append (string, ", ");
        g_ascii_dtostr (factor, sizeof (factor), value->sym_col.shade.factor);
        g_string_append (string, factor);
        g_string_append (string, ")");
      }
      break;
    case COLOR_TYPE_ALPHA:
      {
        char factor[G_ASCII_DTOSTR_BUF_SIZE];

        g_string_append (string, "alpha(");
        _gtk_css_value_print (value->sym_col.alpha.color, string);
        g_string_append (string, ", ");
        g_ascii_dtostr (factor, sizeof (factor), value->sym_col.alpha.factor);
        g_string_append (string, factor);
        g_string_append (string, ")");
      }
      break;
    case COLOR_TYPE_MIX:
      {
        char factor[G_ASCII_DTOSTR_BUF_SIZE];

        g_string_append (string, "mix(");
        _gtk_css_value_print (value->sym_col.mix.color1, string);
        g_string_append (string, ", ");
        _gtk_css_value_print (value->sym_col.mix.color2, string);
        g_string_append (string, ", ");
412
        g_ascii_dtostr (factor, sizeof (factor), value->sym_col.mix.factor);
413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
        g_string_append (string, factor);
        g_string_append (string, ")");
      }
      break;
    case COLOR_TYPE_WIN32:
      {
        g_string_append_printf (string, GTK_WIN32_THEME_SYMBOLIC_COLOR_NAME"(%s, %d)", 
			        value->sym_col.win32.theme_class, value->sym_col.win32.id);
      }
      break;
    case COLOR_TYPE_CURRENT_COLOR:
      g_string_append (string, "currentColor");
      break;
    default:
      g_assert_not_reached ();
    }
}

static const GtkCssValueClass GTK_CSS_VALUE_COLOR = {
  gtk_css_value_color_free,
  gtk_css_value_color_compute,
  gtk_css_value_color_equal,
  gtk_css_value_color_transition,
  gtk_css_value_color_print
};

GtkCssValue *
_gtk_css_color_value_new_literal (const GdkRGBA *color)
{
  GtkCssValue *value;

  g_return_val_if_fail (color != NULL, NULL);

  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
  value->type = COLOR_TYPE_LITERAL;
  value->last_value = _gtk_css_rgba_value_new_from_rgba (color);

  return value;
}

GtkCssValue *
_gtk_css_color_value_new_rgba (double red,
                               double green,
                               double blue,
                               double alpha)
{
  GdkRGBA rgba = { red, green, blue, alpha };

  return _gtk_css_color_value_new_literal (&rgba);
}

GtkCssValue *
_gtk_css_color_value_new_name (const gchar *name)
{
  GtkCssValue *value;

  g_return_val_if_fail (name != NULL, NULL);

  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
  value->type = COLOR_TYPE_NAME;
  value->sym_col.name = g_strdup (name);

  return value;
}

GtkCssValue *
_gtk_css_color_value_new_shade (GtkCssValue *color,
                                gdouble      factor)
{
  GtkCssValue *value;

  g_return_val_if_fail (color->class == &GTK_CSS_VALUE_COLOR, NULL);

  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
  value->type = COLOR_TYPE_SHADE;
  value->sym_col.shade.color = _gtk_css_value_ref (color);
  value->sym_col.shade.factor = factor;

  return value;
}

GtkCssValue *
_gtk_css_color_value_new_alpha (GtkCssValue *color,
                                gdouble      factor)
{
  GtkCssValue *value;

  g_return_val_if_fail (color->class == &GTK_CSS_VALUE_COLOR, NULL);

  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
  value->type = COLOR_TYPE_ALPHA;
  value->sym_col.alpha.color = _gtk_css_value_ref (color);
  value->sym_col.alpha.factor = factor;

  return value;
}

GtkCssValue *
_gtk_css_color_value_new_mix (GtkCssValue *color1,
                              GtkCssValue *color2,
                              gdouble      factor)
{
  GtkCssValue *value;

  g_return_val_if_fail (color1->class == &GTK_CSS_VALUE_COLOR, NULL);
  g_return_val_if_fail (color2->class == &GTK_CSS_VALUE_COLOR, NULL);

  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
  value->type = COLOR_TYPE_MIX;
  value->sym_col.mix.color1 = _gtk_css_value_ref (color1);
  value->sym_col.mix.color2 = _gtk_css_value_ref (color2);
  value->sym_col.mix.factor = factor;

  return value;
}

GtkCssValue *
_gtk_css_color_value_new_win32 (const gchar *theme_class,
                                gint         id)
{
  GtkCssValue *value;

  g_return_val_if_fail (theme_class != NULL, NULL);

  value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_COLOR);
  value->type = COLOR_TYPE_WIN32;
  value->sym_col.win32.theme_class = g_strdup (theme_class);
  value->sym_col.win32.id = id;

  return value;
}

GtkCssValue *
_gtk_css_color_value_new_current_color (void)
{
  static GtkCssValue current_color = { &GTK_CSS_VALUE_COLOR, 1, COLOR_TYPE_CURRENT_COLOR, NULL, };

  return _gtk_css_value_ref (&current_color);
}

typedef enum {
  COLOR_RGBA,
  COLOR_RGB,
  COLOR_LIGHTER,
  COLOR_DARKER,
  COLOR_SHADE,
  COLOR_ALPHA,
  COLOR_MIX,
  COLOR_WIN32
} ColorParseType;

static GtkCssValue *
gtk_css_color_parse_win32 (GtkCssParser *parser)
{
  GtkCssValue *color;
  char *class;
  int id;

  class = _gtk_css_parser_try_name (parser, TRUE);
  if (class == NULL)
    {
      _gtk_css_parser_error (parser,
			     "Expected name as first argument to  '-gtk-win32-color'");
      return NULL;
    }

  if (! _gtk_css_parser_try (parser, ",", TRUE))
    {
      g_free (class);
      _gtk_css_parser_error (parser,
			     "Expected ','");
      return NULL;
    }

  if (!_gtk_css_parser_try_int (parser, &id))
    {
      g_free (class);
      _gtk_css_parser_error (parser, "Expected a valid integer value");
      return NULL;
    }

  color = _gtk_css_color_value_new_win32 (class, id);
  g_free (class);
  return color;
}

static GtkCssValue *
_gtk_css_color_value_parse_function (GtkCssParser   *parser,
                                     ColorParseType  color)
{
  GtkCssValue *value;
  GtkCssValue *child1, *child2;
  double d;

  if (!_gtk_css_parser_try (parser, "(", TRUE))
    {
      _gtk_css_parser_error (parser, "Missing opening bracket in color definition");
      return NULL;
    }

  if (color == COLOR_RGB || color == COLOR_RGBA)
    {
      GdkRGBA rgba;
      double tmp;
      guint i;

      for (i = 0; i < 3; i++)
        {
          if (i > 0 && !_gtk_css_parser_try (parser, ",", TRUE))
            {
              _gtk_css_parser_error (parser, "Expected ',' in color definition");
              return NULL;
            }

          if (!_gtk_css_parser_try_double (parser, &tmp))
            {
              _gtk_css_parser_error (parser, "Invalid number for color value");
              return NULL;
            }
          if (_gtk_css_parser_try (parser, "%", TRUE))
            tmp /= 100.0;
          else
            tmp /= 255.0;
          if (i == 0)
            rgba.red = tmp;
          else if (i == 1)
            rgba.green = tmp;
          else if (i == 2)
            rgba.blue = tmp;
          else
            g_assert_not_reached ();
        }

      if (color == COLOR_RGBA)
        {
          if (i > 0 && !_gtk_css_parser_try (parser, ",", TRUE))
            {
              _gtk_css_parser_error (parser, "Expected ',' in color definition");
              return NULL;
            }

          if (!_gtk_css_parser_try_double (parser, &rgba.alpha))
            {
              _gtk_css_parser_error (parser, "Invalid number for alpha value");
              return NULL;
            }
        }
      else
        rgba.alpha = 1.0;
      
      value = _gtk_css_color_value_new_literal (&rgba);
    }
  else if (color == COLOR_WIN32)
    {
      value = gtk_css_color_parse_win32 (parser);
      if (value == NULL)
	return NULL;
    }
  else
    {
      child1 = _gtk_css_color_value_parse (parser);
      if (child1 == NULL)
        return NULL;

      if (color == COLOR_MIX)
        {
          if (!_gtk_css_parser_try (parser, ",", TRUE))
            {
              _gtk_css_parser_error (parser, "Expected ',' in color definition");
              _gtk_css_value_unref (child1);
              return NULL;
            }

          child2 = _gtk_css_color_value_parse (parser);
          if (child2 == NULL)
            {
              _gtk_css_value_unref (child1);
              return NULL;
            }
        }
      else
        child2 = NULL;

      if (color == COLOR_LIGHTER)
        d = 1.3;
      else if (color == COLOR_DARKER)
        d = 0.7;
      else
        {
          if (!_gtk_css_parser_try (parser, ",", TRUE))
            {
              _gtk_css_parser_error (parser, "Expected ',' in color definition");
              _gtk_css_value_unref (child1);
              if (child2)
                _gtk_css_value_unref (child2);
              return NULL;
            }

          if (!_gtk_css_parser_try_double (parser, &d))
            {
              _gtk_css_parser_error (parser, "Expected number in color definition");
              _gtk_css_value_unref (child1);
              if (child2)
                _gtk_css_value_unref (child2);
              return NULL;
            }
        }
      
      switch (color)
        {
        case COLOR_LIGHTER:
        case COLOR_DARKER:
        case COLOR_SHADE:
          value = _gtk_css_color_value_new_shade (child1, d);
          break;
        case COLOR_ALPHA:
          value = _gtk_css_color_value_new_alpha (child1, d);
          break;
        case COLOR_MIX:
          value = _gtk_css_color_value_new_mix (child1, child2, d);
          break;
        default:
          g_assert_not_reached ();
          value = NULL;
        }

      _gtk_css_value_unref (child1);
      if (child2)
        _gtk_css_value_unref (child2);
    }

  if (!_gtk_css_parser_try (parser, ")", TRUE))
    {
      _gtk_css_parser_error (parser, "Expected ')' in color definition");
      _gtk_css_value_unref (value);
      return NULL;
    }

  return value;
}

GtkCssValue *
_gtk_css_color_value_parse (GtkCssParser *parser)
{
  GtkCssValue *value;
  GdkRGBA rgba;
  guint color;
  const char *names[] = {"rgba", "rgb",  "lighter", "darker", "shade", "alpha", "mix",
			 GTK_WIN32_THEME_SYMBOLIC_COLOR_NAME};
  char *name;

  if (_gtk_css_parser_try (parser, "currentColor", TRUE))
    return _gtk_css_color_value_new_current_color ();

  if (_gtk_css_parser_try (parser, "transparent", TRUE))
    {
      GdkRGBA transparent = { 0, 0, 0, 0 };
      
      return _gtk_css_color_value_new_literal (&transparent);
    }

  if (_gtk_css_parser_try (parser, "@", FALSE))
    {
      name = _gtk_css_parser_try_name (parser, TRUE);

      if (name)
        {
          value = _gtk_css_color_value_new_name (name);
        }
      else
        {
          _gtk_css_parser_error (parser, "'%s' is not a valid color color name", name);
          value = NULL;
        }

      g_free (name);
      return value;
    }

  for (color = 0; color < G_N_ELEMENTS (names); color++)
    {
      if (_gtk_css_parser_try (parser, names[color], TRUE))
        break;
    }

  if (color < G_N_ELEMENTS (names))
    return _gtk_css_color_value_parse_function (parser, color);

  if (_gtk_css_parser_try_hash_color (parser, &rgba))
    return _gtk_css_color_value_new_literal (&rgba);

  name = _gtk_css_parser_try_name (parser, TRUE);
  if (name)
    {
      if (gdk_rgba_parse (&rgba, name))
        {
          value = _gtk_css_color_value_new_literal (&rgba);
        }
      else
        {
          _gtk_css_parser_error (parser, "'%s' is not a valid color name", name);
          value = NULL;
        }
      g_free (name);
      return value;
    }

  _gtk_css_parser_error (parser, "Not a color definition");
  return NULL;
}