pixman/pixman-image.c

   1 /*
   2  * Copyright © 2000 SuSE, Inc.
   3  * Copyright © 2007 Red Hat, Inc.
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and its
   6  * documentation for any purpose is hereby granted without fee, provided that
   7  * the above copyright notice appear in all copies and that both that
   8  * copyright notice and this permission notice appear in supporting
   9  * documentation, and that the name of SuSE not be used in advertising or
  10  * publicity pertaining to distribution of the software without specific,
  11  * written prior permission.  SuSE makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as is"
  13  * without express or implied warranty.
  14  *
  15  * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
  17  * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  19  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <assert.h>
  31
  32 #include "pixman-private.h"
  33
  34 pixman_bool_t
  35 _pixman_init_gradient (gradient_t *                  gradient,
  36                        const pixman_gradient_stop_t *stops,
  37                        int                           n_stops)
  38 {
  39     return_val_if_fail (n_stops > 0, FALSE);
  40
  41     gradient->stops = pixman_malloc_ab (n_stops, sizeof (pixman_gradient_stop_t));
  42     if (!gradient->stops)
  43         return FALSE;
  44
  45     memcpy (gradient->stops, stops, n_stops * sizeof (pixman_gradient_stop_t));
  46
  47     gradient->n_stops = n_stops;
  48
  49     return TRUE;
  50 }
  51
  52 pixman_image_t *
  53 _pixman_image_allocate (void)
  54 {
  55     pixman_image_t *image = malloc (sizeof (pixman_image_t));
  56
  57     if (image)
  58     {
  59         image_common_t *common = &image->common;
  60
  61         pixman_region32_init (&common->clip_region);
  62
  63         common->alpha_count = 0;
  64         common->have_clip_region = FALSE;
  65         common->clip_sources = FALSE;
  66         common->transform = NULL;
  67         common->repeat = PIXMAN_REPEAT_NONE;
  68         common->filter = PIXMAN_FILTER_NEAREST;
  69         common->filter_params = NULL;
  70         common->n_filter_params = 0;
  71         common->alpha_map = NULL;
  72         common->component_alpha = FALSE;
  73         common->ref_count = 1;
  74         common->property_changed = NULL;
  75         common->client_clip = FALSE;
  76         common->destroy_func = NULL;
  77         common->destroy_data = NULL;
  78         common->dirty = TRUE;
  79     }
  80
  81     return image;
  82 }
  83
  84 static void
  85 image_property_changed (pixman_image_t *image)
  86 {
  87     image->common.dirty = TRUE;
  88 }
  89
  90 /* Ref Counting */
  91 PIXMAN_EXPORT pixman_image_t *
  92 pixman_image_ref (pixman_image_t *image)
  93 {
  94     image->common.ref_count++;
  95
  96     return image;
  97 }
  98
  99 /* returns TRUE when the image is freed */
 100 PIXMAN_EXPORT pixman_bool_t
 101 pixman_image_unref (pixman_image_t *image)
 102 {
 103     image_common_t *common = (image_common_t *)image;
 104
 105     common->ref_count--;
 106
 107     if (common->ref_count == 0)
 108     {
 109         if (image->common.destroy_func)
 110             image->common.destroy_func (image, image->common.destroy_data);
 111
 112         pixman_region32_fini (&common->clip_region);
 113
 114         if (common->transform)
 115             free (common->transform);
 116
 117         if (common->filter_params)
 118             free (common->filter_params);
 119
 120         if (common->alpha_map)
 121             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 122
 123         if (image->type == LINEAR ||
 124             image->type == RADIAL ||
 125             image->type == CONICAL)
 126         {
 127             if (image->gradient.stops)
 128                 free (image->gradient.stops);
 129         }
 130
 131         if (image->type == BITS && image->bits.free_me)
 132             free (image->bits.free_me);
 133
 134         free (image);
 135
 136         return TRUE;
 137     }
 138
 139     return FALSE;
 140 }
 141
 142 PIXMAN_EXPORT void
 143 pixman_image_set_destroy_function (pixman_image_t *            image,
 144                                    pixman_image_destroy_func_t func,
 145                                    void *                      data)
 146 {
 147     image->common.destroy_func = func;
 148     image->common.destroy_data = data;
 149 }
 150
 151 PIXMAN_EXPORT void *
 152 pixman_image_get_destroy_data (pixman_image_t *image)
 153 {
 154   return image->common.destroy_data;
 155 }
 156
 157 void
 158 _pixman_image_reset_clip_region (pixman_image_t *image)
 159 {
 160     image->common.have_clip_region = FALSE;
 161 }
 162
 163 /* Executive Summary: This function is a no-op that only exists
 164  * for historical reasons.
 165  *
 166  * There used to be a bug in the X server where it would rely on
 167  * out-of-bounds accesses when it was asked to composite with a
 168  * window as the source. It would create a pixman image pointing
 169  * to some bogus position in memory, but then set a clip region
 170  * to the position where the actual bits were.
 171  *
 172  * Due to a bug in old versions of pixman, where it would not clip
 173  * against the image bounds when a clip region was set, this would
 174  * actually work. So when the pixman bug was fixed, a workaround was
 175  * added to allow certain out-of-bound accesses. This function disabled
 176  * those workarounds.
 177  *
 178  * Since 0.21.2, pixman doesn't do these workarounds anymore, so now
 179  * this function is a no-op.
 180  */
 181 PIXMAN_EXPORT void
 182 pixman_disable_out_of_bounds_workaround (void)
 183 {
 184 }
 185
 186 static void
 187 compute_image_info (pixman_image_t *image)
 188 {
 189     pixman_format_code_t code;
 190     uint32_t flags = 0;
 191
 192     /* Transform */
 193     if (!image->common.transform)
 194     {
 195         flags |= (FAST_PATH_ID_TRANSFORM        |
 196                   FAST_PATH_X_UNIT_POSITIVE     |
 197                   FAST_PATH_Y_UNIT_ZERO         |
 198                   FAST_PATH_AFFINE_TRANSFORM);
 199     }
 200     else
 201     {
 202         flags |= FAST_PATH_HAS_TRANSFORM;
 203
 204         if (image->common.transform->matrix[2][0] == 0                  &&
 205             image->common.transform->matrix[2][1] == 0                  &&
 206             image->common.transform->matrix[2][2] == pixman_fixed_1)
 207         {
 208             flags |= FAST_PATH_AFFINE_TRANSFORM;
 209
 210             if (image->common.transform->matrix[0][1] == 0 &&
 211                 image->common.transform->matrix[1][0] == 0)
 212             {
 213                 if (image->common.transform->matrix[0][0] == -pixman_fixed_1 &&
 214                     image->common.transform->matrix[1][1] == -pixman_fixed_1)
 215                 {
 216                     flags |= FAST_PATH_ROTATE_180_TRANSFORM;
 217                 }
 218                 flags |= FAST_PATH_SCALE_TRANSFORM;
 219             }
 220             else if (image->common.transform->matrix[0][0] == 0 &&
 221                      image->common.transform->matrix[1][1] == 0)
 222             {
 223                 pixman_fixed_t m01 = image->common.transform->matrix[0][1];
 224                 if (m01 == -image->common.transform->matrix[1][0])
 225                 {
 226                         if (m01 == -pixman_fixed_1)
 227                             flags |= FAST_PATH_ROTATE_90_TRANSFORM;
 228                         else if (m01 == pixman_fixed_1)
 229                             flags |= FAST_PATH_ROTATE_270_TRANSFORM;
 230                 }
 231             }
 232         }
 233
 234         if (image->common.transform->matrix[0][0] > 0)
 235             flags |= FAST_PATH_X_UNIT_POSITIVE;
 236
 237         if (image->common.transform->matrix[1][0] == 0)
 238             flags |= FAST_PATH_Y_UNIT_ZERO;
 239     }
 240
 241     /* Filter */
 242     switch (image->common.filter)
 243     {
 244     case PIXMAN_FILTER_NEAREST:
 245     case PIXMAN_FILTER_FAST:
 246         flags |= (FAST_PATH_NEAREST_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 247         break;
 248
 249     case PIXMAN_FILTER_BILINEAR:
 250     case PIXMAN_FILTER_GOOD:
 251     case PIXMAN_FILTER_BEST:
 252         flags |= (FAST_PATH_BILINEAR_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 253
 254         /* Reduce BILINEAR to NEAREST for identity transforms */
 255         if (flags & FAST_PATH_ID_TRANSFORM)
 256             flags |= FAST_PATH_NEAREST_FILTER;
 257         break;
 258
 259     case PIXMAN_FILTER_CONVOLUTION:
 260         break;
 261
 262     default:
 263         flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
 264         break;
 265     }
 266
 267     /* Repeat mode */
 268     switch (image->common.repeat)
 269     {
 270     case PIXMAN_REPEAT_NONE:
 271         flags |=
 272             FAST_PATH_NO_REFLECT_REPEAT         |
 273             FAST_PATH_NO_PAD_REPEAT             |
 274             FAST_PATH_NO_NORMAL_REPEAT;
 275         break;
 276
 277     case PIXMAN_REPEAT_REFLECT:
 278         flags |=
 279             FAST_PATH_NO_PAD_REPEAT             |
 280             FAST_PATH_NO_NONE_REPEAT            |
 281             FAST_PATH_NO_NORMAL_REPEAT;
 282         break;
 283
 284     case PIXMAN_REPEAT_PAD:
 285         flags |=
 286             FAST_PATH_NO_REFLECT_REPEAT         |
 287             FAST_PATH_NO_NONE_REPEAT            |
 288             FAST_PATH_NO_NORMAL_REPEAT;
 289         break;
 290
 291     default:
 292         flags |=
 293             FAST_PATH_NO_REFLECT_REPEAT         |
 294             FAST_PATH_NO_PAD_REPEAT             |
 295             FAST_PATH_NO_NONE_REPEAT;
 296         break;
 297     }
 298
 299     /* Component alpha */
 300     if (image->common.component_alpha)
 301         flags |= FAST_PATH_COMPONENT_ALPHA;
 302     else
 303         flags |= FAST_PATH_UNIFIED_ALPHA;
 304
 305     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NARROW_FORMAT);
 306
 307     /* Type specific checks */
 308     switch (image->type)
 309     {
 310     case SOLID:
 311         code = PIXMAN_solid;
 312
 313         if (image->solid.color.alpha == 0xffff)
 314             flags |= FAST_PATH_IS_OPAQUE;
 315         break;
 316
 317     case BITS:
 318         if (image->bits.width == 1      &&
 319             image->bits.height == 1     &&
 320             image->common.repeat != PIXMAN_REPEAT_NONE)
 321         {
 322             code = PIXMAN_solid;
 323         }
 324         else
 325         {
 326             code = image->bits.format;
 327         }
 328
 329         if (!PIXMAN_FORMAT_A (image->bits.format)                               &&
 330             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_GRAY         &&
 331             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_COLOR)
 332         {
 333             flags |= FAST_PATH_SAMPLES_OPAQUE;
 334
 335             if (image->common.repeat != PIXMAN_REPEAT_NONE)
 336                 flags |= FAST_PATH_IS_OPAQUE;
 337         }
 338
 339         if (image->bits.read_func || image->bits.write_func)
 340             flags &= ~FAST_PATH_NO_ACCESSORS;
 341
 342         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 343             flags &= ~FAST_PATH_NARROW_FORMAT;
 344         break;
 345
 346     case RADIAL:
 347         code = PIXMAN_unknown;
 348
 349         /*
 350          * As explained in pixman-radial-gradient.c, every point of
 351          * the plane has a valid associated radius (and thus will be
 352          * colored) if and only if a is negative (i.e. one of the two
 353          * circles contains the other one).
 354          */
 355
 356         if (image->radial.a >= 0)
 357             break;
 358
 359         /* Fall through */
 360
 361     case CONICAL:
 362     case LINEAR:
 363         code = PIXMAN_unknown;
 364
 365         if (image->common.repeat != PIXMAN_REPEAT_NONE)
 366         {
 367             int i;
 368
 369             flags |= FAST_PATH_IS_OPAQUE;
 370             for (i = 0; i < image->gradient.n_stops; ++i)
 371             {
 372                 if (image->gradient.stops[i].color.alpha != 0xffff)
 373                 {
 374                     flags &= ~FAST_PATH_IS_OPAQUE;
 375                     break;
 376                 }
 377             }
 378         }
 379         break;
 380
 381     default:
 382         code = PIXMAN_unknown;
 383         break;
 384     }
 385
 386     /* Alpha map */
 387     if (!image->common.alpha_map)
 388     {
 389         flags |= FAST_PATH_NO_ALPHA_MAP;
 390     }
 391     else
 392     {
 393         if (PIXMAN_FORMAT_IS_WIDE (image->common.alpha_map->format))
 394             flags &= ~FAST_PATH_NARROW_FORMAT;
 395     }
 396
 397     /* Both alpha maps and convolution filters can introduce
 398      * non-opaqueness in otherwise opaque images. Also
 399      * an image with component alpha turned on is only opaque
 400      * if all channels are opaque, so we simply turn it off
 401      * unconditionally for those images.
 402      */
 403     if (image->common.alpha_map                                 ||
 404         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 405         image->common.component_alpha)
 406     {
 407         flags &= ~(FAST_PATH_IS_OPAQUE | FAST_PATH_SAMPLES_OPAQUE);
 408     }
 409
 410     image->common.flags = flags;
 411     image->common.extended_format_code = code;
 412 }
 413
 414 void
 415 _pixman_image_validate (pixman_image_t *image)
 416 {
 417     if (image->common.dirty)
 418     {
 419         compute_image_info (image);
 420
 421         /* It is important that property_changed is
 422          * called *after* compute_image_info() because
 423          * property_changed() can make use of the flags
 424          * to set up accessors etc.
 425          */
 426         if (image->common.property_changed)
 427             image->common.property_changed (image);
 428
 429         image->common.dirty = FALSE;
 430     }
 431
 432     if (image->common.alpha_map)
 433         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 434 }
 435
 436 PIXMAN_EXPORT pixman_bool_t
 437 pixman_image_set_clip_region32 (pixman_image_t *   image,
 438                                 pixman_region32_t *region)
 439 {
 440     image_common_t *common = (image_common_t *)image;
 441     pixman_bool_t result;
 442
 443     if (region)
 444     {
 445         if ((result = pixman_region32_copy (&common->clip_region, region)))
 446             image->common.have_clip_region = TRUE;
 447     }
 448     else
 449     {
 450         _pixman_image_reset_clip_region (image);
 451
 452         result = TRUE;
 453     }
 454
 455     image_property_changed (image);
 456
 457     return result;
 458 }
 459
 460 PIXMAN_EXPORT pixman_bool_t
 461 pixman_image_set_clip_region (pixman_image_t *   image,
 462                               pixman_region16_t *region)
 463 {
 464     image_common_t *common = (image_common_t *)image;
 465     pixman_bool_t result;
 466
 467     if (region)
 468     {
 469         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 470             image->common.have_clip_region = TRUE;
 471     }
 472     else
 473     {
 474         _pixman_image_reset_clip_region (image);
 475
 476         result = TRUE;
 477     }
 478
 479     image_property_changed (image);
 480
 481     return result;
 482 }
 483
 484 PIXMAN_EXPORT void
 485 pixman_image_set_has_client_clip (pixman_image_t *image,
 486                                   pixman_bool_t   client_clip)
 487 {
 488     image->common.client_clip = client_clip;
 489 }
 490
 491 PIXMAN_EXPORT pixman_bool_t
 492 pixman_image_set_transform (pixman_image_t *          image,
 493                             const pixman_transform_t *transform)
 494 {
 495     static const pixman_transform_t id =
 496     {
 497         { { pixman_fixed_1, 0, 0 },
 498           { 0, pixman_fixed_1, 0 },
 499           { 0, 0, pixman_fixed_1 } }
 500     };
 501
 502     image_common_t *common = (image_common_t *)image;
 503     pixman_bool_t result;
 504
 505     if (common->transform == transform)
 506         return TRUE;
 507
 508     if (!transform || memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 509     {
 510         free (common->transform);
 511         common->transform = NULL;
 512         result = TRUE;
 513
 514         goto out;
 515     }
 516
 517     if (common->transform &&
 518         memcmp (common->transform, transform, sizeof (pixman_transform_t) == 0))
 519     {
 520         return TRUE;
 521     }
 522
 523     if (common->transform == NULL)
 524         common->transform = malloc (sizeof (pixman_transform_t));
 525
 526     if (common->transform == NULL)
 527     {
 528         result = FALSE;
 529
 530         goto out;
 531     }
 532
 533     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 534
 535     result = TRUE;
 536
 537 out:
 538     image_property_changed (image);
 539
 540     return result;
 541 }
 542
 543 PIXMAN_EXPORT void
 544 pixman_image_set_repeat (pixman_image_t *image,
 545                          pixman_repeat_t repeat)
 546 {
 547     if (image->common.repeat == repeat)
 548         return;
 549
 550     image->common.repeat = repeat;
 551
 552     image_property_changed (image);
 553 }
 554
 555 PIXMAN_EXPORT pixman_bool_t
 556 pixman_image_set_filter (pixman_image_t *      image,
 557                          pixman_filter_t       filter,
 558                          const pixman_fixed_t *params,
 559                          int                   n_params)
 560 {
 561     image_common_t *common = (image_common_t *)image;
 562     pixman_fixed_t *new_params;
 563
 564     if (params == common->filter_params && filter == common->filter)
 565         return TRUE;
 566
 567     new_params = NULL;
 568     if (params)
 569     {
 570         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 571         if (!new_params)
 572             return FALSE;
 573
 574         memcpy (new_params,
 575                 params, n_params * sizeof (pixman_fixed_t));
 576     }
 577
 578     common->filter = filter;
 579
 580     if (common->filter_params)
 581         free (common->filter_params);
 582
 583     common->filter_params = new_params;
 584     common->n_filter_params = n_params;
 585
 586     image_property_changed (image);
 587     return TRUE;
 588 }
 589
 590 PIXMAN_EXPORT void
 591 pixman_image_set_source_clipping (pixman_image_t *image,
 592                                   pixman_bool_t   clip_sources)
 593 {
 594     if (image->common.clip_sources == clip_sources)
 595         return;
 596
 597     image->common.clip_sources = clip_sources;
 598
 599     image_property_changed (image);
 600 }
 601
 602 /* Unlike all the other property setters, this function does not
 603  * copy the content of indexed. Doing this copying is simply
 604  * way, way too expensive.
 605  */
 606 PIXMAN_EXPORT void
 607 pixman_image_set_indexed (pixman_image_t *        image,
 608                           const pixman_indexed_t *indexed)
 609 {
 610     bits_image_t *bits = (bits_image_t *)image;
 611
 612     if (bits->indexed == indexed)
 613         return;
 614
 615     bits->indexed = indexed;
 616
 617     image_property_changed (image);
 618 }
 619
 620 PIXMAN_EXPORT void
 621 pixman_image_set_alpha_map (pixman_image_t *image,
 622                             pixman_image_t *alpha_map,
 623                             int16_t         x,
 624                             int16_t         y)
 625 {
 626     image_common_t *common = (image_common_t *)image;
 627
 628     return_if_fail (!alpha_map || alpha_map->type == BITS);
 629
 630     if (alpha_map && common->alpha_count > 0)
 631     {
 632         /* If this image is being used as an alpha map itself,
 633          * then you can't give it an alpha map of its own.
 634          */
 635         return;
 636     }
 637
 638     if (alpha_map && alpha_map->common.alpha_map)
 639     {
 640         /* If the image has an alpha map of its own,
 641          * then it can't be used as an alpha map itself
 642          */
 643         return;
 644     }
 645
 646     if (common->alpha_map != (bits_image_t *)alpha_map)
 647     {
 648         if (common->alpha_map)
 649         {
 650             common->alpha_map->common.alpha_count--;
 651
 652             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 653         }
 654
 655         if (alpha_map)
 656         {
 657             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 658
 659             common->alpha_map->common.alpha_count++;
 660         }
 661         else
 662         {
 663             common->alpha_map = NULL;
 664         }
 665     }
 666
 667     common->alpha_origin_x = x;
 668     common->alpha_origin_y = y;
 669
 670     image_property_changed (image);
 671 }
 672
 673 PIXMAN_EXPORT void
 674 pixman_image_set_component_alpha   (pixman_image_t *image,
 675                                     pixman_bool_t   component_alpha)
 676 {
 677     if (image->common.component_alpha == component_alpha)
 678         return;
 679
 680     image->common.component_alpha = component_alpha;
 681
 682     image_property_changed (image);
 683 }
 684
 685 PIXMAN_EXPORT pixman_bool_t
 686 pixman_image_get_component_alpha   (pixman_image_t       *image)
 687 {
 688     return image->common.component_alpha;
 689 }
 690
 691 PIXMAN_EXPORT void
 692 pixman_image_set_accessors (pixman_image_t *           image,
 693                             pixman_read_memory_func_t  read_func,
 694                             pixman_write_memory_func_t write_func)
 695 {
 696     return_if_fail (image != NULL);
 697
 698     if (image->type == BITS)
 699     {
 700         image->bits.read_func = read_func;
 701         image->bits.write_func = write_func;
 702
 703         image_property_changed (image);
 704     }
 705 }
 706
 707 PIXMAN_EXPORT uint32_t *
 708 pixman_image_get_data (pixman_image_t *image)
 709 {
 710     if (image->type == BITS)
 711         return image->bits.bits;
 712
 713     return NULL;
 714 }
 715
 716 PIXMAN_EXPORT int
 717 pixman_image_get_width (pixman_image_t *image)
 718 {
 719     if (image->type == BITS)
 720         return image->bits.width;
 721
 722     return 0;
 723 }
 724
 725 PIXMAN_EXPORT int
 726 pixman_image_get_height (pixman_image_t *image)
 727 {
 728     if (image->type == BITS)
 729         return image->bits.height;
 730
 731     return 0;
 732 }
 733
 734 PIXMAN_EXPORT int
 735 pixman_image_get_stride (pixman_image_t *image)
 736 {
 737     if (image->type == BITS)
 738         return image->bits.rowstride * (int) sizeof (uint32_t);
 739
 740     return 0;
 741 }
 742
 743 PIXMAN_EXPORT int
 744 pixman_image_get_depth (pixman_image_t *image)
 745 {
 746     if (image->type == BITS)
 747         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 748
 749     return 0;
 750 }
 751
 752 PIXMAN_EXPORT pixman_format_code_t
 753 pixman_image_get_format (pixman_image_t *image)
 754 {
 755     if (image->type == BITS)
 756         return image->bits.format;
 757
 758     return 0;
 759 }
 760
 761 uint32_t
 762 _pixman_image_get_solid (pixman_implementation_t *imp,
 763                          pixman_image_t *         image,
 764                          pixman_format_code_t     format)
 765 {
 766     uint32_t result;
 767     pixman_iter_t iter;
 768
 769     _pixman_implementation_src_iter_init (
 770         imp, &iter, image, 0, 0, 1, 1,
 771         (uint8_t *)&result, ITER_NARROW);
 772
 773     result = *iter.get_scanline (&iter, NULL);
 774
 775     /* If necessary, convert RGB <--> BGR. */
 776     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 777     {
 778         result = (((result & 0xff000000) >>  0) |
 779                   ((result & 0x00ff0000) >> 16) |
 780                   ((result & 0x0000ff00) >>  0) |
 781                   ((result & 0x000000ff) << 16));
 782     }
 783
 784     return result;
 785 }