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 void
  53 _pixman_image_init (pixman_image_t *image)
  54 {
  55     image_common_t *common = &image->common;
  56
  57     pixman_region32_init (&common->clip_region);
  58
  59     common->alpha_count = 0;
  60     common->have_clip_region = FALSE;
  61     common->clip_sources = FALSE;
  62     common->transform = NULL;
  63     common->repeat = PIXMAN_REPEAT_NONE;
  64     common->filter = PIXMAN_FILTER_NEAREST;
  65     common->filter_params = NULL;
  66     common->n_filter_params = 0;
  67     common->alpha_map = NULL;
  68     common->component_alpha = FALSE;
  69     common->ref_count = 1;
  70     common->property_changed = NULL;
  71     common->client_clip = FALSE;
  72     common->destroy_func = NULL;
  73     common->destroy_data = NULL;
  74     common->dirty = TRUE;
  75 }
  76
  77 pixman_bool_t
  78 _pixman_image_fini (pixman_image_t *image)
  79 {
  80     image_common_t *common = (image_common_t *)image;
  81
  82     common->ref_count--;
  83
  84     if (common->ref_count == 0)
  85     {
  86         if (image->common.destroy_func)
  87             image->common.destroy_func (image, image->common.destroy_data);
  88
  89         pixman_region32_fini (&common->clip_region);
  90
  91         if (common->transform)
  92             free (common->transform);
  93
  94         if (common->filter_params)
  95             free (common->filter_params);
  96
  97         if (common->alpha_map)
  98             pixman_image_unref ((pixman_image_t *)common->alpha_map);
  99
 100         if (image->type == LINEAR ||
 101             image->type == RADIAL ||
 102             image->type == CONICAL)
 103         {
 104             if (image->gradient.stops)
 105                 free (image->gradient.stops);
 106         }
 107
 108         if (image->type == BITS && image->bits.free_me)
 109             free (image->bits.free_me);
 110
 111         return TRUE;
 112     }
 113
 114     return FALSE;
 115 }
 116
 117 pixman_image_t *
 118 _pixman_image_allocate (void)
 119 {
 120     pixman_image_t *image = malloc (sizeof (pixman_image_t));
 121
 122     if (image)
 123         _pixman_image_init (image);
 124
 125     return image;
 126 }
 127
 128 static void
 129 image_property_changed (pixman_image_t *image)
 130 {
 131     image->common.dirty = TRUE;
 132 }
 133
 134 /* Ref Counting */
 135 PIXMAN_EXPORT pixman_image_t *
 136 pixman_image_ref (pixman_image_t *image)
 137 {
 138     image->common.ref_count++;
 139
 140     return image;
 141 }
 142
 143 /* returns TRUE when the image is freed */
 144 PIXMAN_EXPORT pixman_bool_t
 145 pixman_image_unref (pixman_image_t *image)
 146 {
 147     if (_pixman_image_fini (image))
 148     {
 149         free (image);
 150         return TRUE;
 151     }
 152
 153     return FALSE;
 154 }
 155
 156 PIXMAN_EXPORT void
 157 pixman_image_set_destroy_function (pixman_image_t *            image,
 158                                    pixman_image_destroy_func_t func,
 159                                    void *                      data)
 160 {
 161     image->common.destroy_func = func;
 162     image->common.destroy_data = data;
 163 }
 164
 165 PIXMAN_EXPORT void *
 166 pixman_image_get_destroy_data (pixman_image_t *image)
 167 {
 168   return image->common.destroy_data;
 169 }
 170
 171 void
 172 _pixman_image_reset_clip_region (pixman_image_t *image)
 173 {
 174     image->common.have_clip_region = FALSE;
 175 }
 176
 177 /* Executive Summary: This function is a no-op that only exists
 178  * for historical reasons.
 179  *
 180  * There used to be a bug in the X server where it would rely on
 181  * out-of-bounds accesses when it was asked to composite with a
 182  * window as the source. It would create a pixman image pointing
 183  * to some bogus position in memory, but then set a clip region
 184  * to the position where the actual bits were.
 185  *
 186  * Due to a bug in old versions of pixman, where it would not clip
 187  * against the image bounds when a clip region was set, this would
 188  * actually work. So when the pixman bug was fixed, a workaround was
 189  * added to allow certain out-of-bound accesses. This function disabled
 190  * those workarounds.
 191  *
 192  * Since 0.21.2, pixman doesn't do these workarounds anymore, so now
 193  * this function is a no-op.
 194  */
 195 PIXMAN_EXPORT void
 196 pixman_disable_out_of_bounds_workaround (void)
 197 {
 198 }
 199
 200 static void
 201 compute_image_info (pixman_image_t *image)
 202 {
 203     pixman_format_code_t code;
 204     uint32_t flags = 0;
 205
 206     /* Transform */
 207     if (!image->common.transform)
 208     {
 209         flags |= (FAST_PATH_ID_TRANSFORM        |
 210                   FAST_PATH_X_UNIT_POSITIVE     |
 211                   FAST_PATH_Y_UNIT_ZERO         |
 212                   FAST_PATH_AFFINE_TRANSFORM);
 213     }
 214     else
 215     {
 216         flags |= FAST_PATH_HAS_TRANSFORM;
 217
 218         if (image->common.transform->matrix[2][0] == 0                  &&
 219             image->common.transform->matrix[2][1] == 0                  &&
 220             image->common.transform->matrix[2][2] == pixman_fixed_1)
 221         {
 222             flags |= FAST_PATH_AFFINE_TRANSFORM;
 223
 224             if (image->common.transform->matrix[0][1] == 0 &&
 225                 image->common.transform->matrix[1][0] == 0)
 226             {
 227                 if (image->common.transform->matrix[0][0] == -pixman_fixed_1 &&
 228                     image->common.transform->matrix[1][1] == -pixman_fixed_1)
 229                 {
 230                     flags |= FAST_PATH_ROTATE_180_TRANSFORM;
 231                 }
 232                 flags |= FAST_PATH_SCALE_TRANSFORM;
 233             }
 234             else if (image->common.transform->matrix[0][0] == 0 &&
 235                      image->common.transform->matrix[1][1] == 0)
 236             {
 237                 pixman_fixed_t m01 = image->common.transform->matrix[0][1];
 238                 if (m01 == -image->common.transform->matrix[1][0])
 239                 {
 240                         if (m01 == -pixman_fixed_1)
 241                             flags |= FAST_PATH_ROTATE_90_TRANSFORM;
 242                         else if (m01 == pixman_fixed_1)
 243                             flags |= FAST_PATH_ROTATE_270_TRANSFORM;
 244                 }
 245             }
 246         }
 247
 248         if (image->common.transform->matrix[0][0] > 0)
 249             flags |= FAST_PATH_X_UNIT_POSITIVE;
 250
 251         if (image->common.transform->matrix[1][0] == 0)
 252             flags |= FAST_PATH_Y_UNIT_ZERO;
 253     }
 254
 255     /* Filter */
 256     switch (image->common.filter)
 257     {
 258     case PIXMAN_FILTER_NEAREST:
 259     case PIXMAN_FILTER_FAST:
 260         flags |= (FAST_PATH_NEAREST_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 261         break;
 262
 263     case PIXMAN_FILTER_BILINEAR:
 264     case PIXMAN_FILTER_GOOD:
 265     case PIXMAN_FILTER_BEST:
 266         flags |= (FAST_PATH_BILINEAR_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 267
 268         /* Here we have a chance to optimize BILINEAR filter to NEAREST if
 269          * they are equivalent for the currently used transformation matrix.
 270          */
 271         if (flags & FAST_PATH_ID_TRANSFORM)
 272         {
 273             flags |= FAST_PATH_NEAREST_FILTER;
 274         }
 275         else if (
 276             /* affine and integer translation components in matrix ... */
 277             ((flags & FAST_PATH_AFFINE_TRANSFORM) &&
 278              !pixman_fixed_frac (image->common.transform->matrix[0][2] |
 279                                  image->common.transform->matrix[1][2])) &&
 280             (
 281                 /* ... combined with a simple rotation */
 282                 (flags & (FAST_PATH_ROTATE_90_TRANSFORM |
 283                           FAST_PATH_ROTATE_180_TRANSFORM |
 284                           FAST_PATH_ROTATE_270_TRANSFORM)) ||
 285                 /* ... or combined with a simple non-rotated translation */
 286                 (image->common.transform->matrix[0][0] == pixman_fixed_1 &&
 287                  image->common.transform->matrix[1][1] == pixman_fixed_1 &&
 288                  image->common.transform->matrix[0][1] == 0 &&
 289                  image->common.transform->matrix[1][0] == 0)
 290                 )
 291             )
 292         {
 293             /* FIXME: there are some affine-test failures, showing that
 294              * handling of BILINEAR and NEAREST filter is not quite
 295              * equivalent when getting close to 32K for the translation
 296              * components of the matrix. That's likely some bug, but for
 297              * now just skip BILINEAR->NEAREST optimization in this case.
 298              */
 299             pixman_fixed_t magic_limit = pixman_int_to_fixed (30000);
 300             if (image->common.transform->matrix[0][2] <= magic_limit  &&
 301                 image->common.transform->matrix[1][2] <= magic_limit  &&
 302                 image->common.transform->matrix[0][2] >= -magic_limit &&
 303                 image->common.transform->matrix[1][2] >= -magic_limit)
 304             {
 305                 flags |= FAST_PATH_NEAREST_FILTER;
 306             }
 307         }
 308         break;
 309
 310     case PIXMAN_FILTER_CONVOLUTION:
 311         break;
 312
 313     default:
 314         flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
 315         break;
 316     }
 317
 318     /* Repeat mode */
 319     switch (image->common.repeat)
 320     {
 321     case PIXMAN_REPEAT_NONE:
 322         flags |=
 323             FAST_PATH_NO_REFLECT_REPEAT         |
 324             FAST_PATH_NO_PAD_REPEAT             |
 325             FAST_PATH_NO_NORMAL_REPEAT;
 326         break;
 327
 328     case PIXMAN_REPEAT_REFLECT:
 329         flags |=
 330             FAST_PATH_NO_PAD_REPEAT             |
 331             FAST_PATH_NO_NONE_REPEAT            |
 332             FAST_PATH_NO_NORMAL_REPEAT;
 333         break;
 334
 335     case PIXMAN_REPEAT_PAD:
 336         flags |=
 337             FAST_PATH_NO_REFLECT_REPEAT         |
 338             FAST_PATH_NO_NONE_REPEAT            |
 339             FAST_PATH_NO_NORMAL_REPEAT;
 340         break;
 341
 342     default:
 343         flags |=
 344             FAST_PATH_NO_REFLECT_REPEAT         |
 345             FAST_PATH_NO_PAD_REPEAT             |
 346             FAST_PATH_NO_NONE_REPEAT;
 347         break;
 348     }
 349
 350     /* Component alpha */
 351     if (image->common.component_alpha)
 352         flags |= FAST_PATH_COMPONENT_ALPHA;
 353     else
 354         flags |= FAST_PATH_UNIFIED_ALPHA;
 355
 356     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NARROW_FORMAT);
 357
 358     /* Type specific checks */
 359     switch (image->type)
 360     {
 361     case SOLID:
 362         code = PIXMAN_solid;
 363
 364         if (image->solid.color.alpha == 0xffff)
 365             flags |= FAST_PATH_IS_OPAQUE;
 366         break;
 367
 368     case BITS:
 369         if (image->bits.width == 1      &&
 370             image->bits.height == 1     &&
 371             image->common.repeat != PIXMAN_REPEAT_NONE)
 372         {
 373             code = PIXMAN_solid;
 374         }
 375         else
 376         {
 377             code = image->bits.format;
 378             flags |= FAST_PATH_BITS_IMAGE;
 379         }
 380
 381         if (!PIXMAN_FORMAT_A (image->bits.format)                               &&
 382             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_GRAY         &&
 383             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_COLOR)
 384         {
 385             flags |= FAST_PATH_SAMPLES_OPAQUE;
 386
 387             if (image->common.repeat != PIXMAN_REPEAT_NONE)
 388                 flags |= FAST_PATH_IS_OPAQUE;
 389         }
 390
 391         if (image->bits.read_func || image->bits.write_func)
 392             flags &= ~FAST_PATH_NO_ACCESSORS;
 393
 394         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 395             flags &= ~FAST_PATH_NARROW_FORMAT;
 396         break;
 397
 398     case RADIAL:
 399         code = PIXMAN_unknown;
 400
 401         /*
 402          * As explained in pixman-radial-gradient.c, every point of
 403          * the plane has a valid associated radius (and thus will be
 404          * colored) if and only if a is negative (i.e. one of the two
 405          * circles contains the other one).
 406          */
 407
 408         if (image->radial.a >= 0)
 409             break;
 410
 411         /* Fall through */
 412
 413     case CONICAL:
 414     case LINEAR:
 415         code = PIXMAN_unknown;
 416
 417         if (image->common.repeat != PIXMAN_REPEAT_NONE)
 418         {
 419             int i;
 420
 421             flags |= FAST_PATH_IS_OPAQUE;
 422             for (i = 0; i < image->gradient.n_stops; ++i)
 423             {
 424                 if (image->gradient.stops[i].color.alpha != 0xffff)
 425                 {
 426                     flags &= ~FAST_PATH_IS_OPAQUE;
 427                     break;
 428                 }
 429             }
 430         }
 431         break;
 432
 433     default:
 434         code = PIXMAN_unknown;
 435         break;
 436     }
 437
 438     /* Alpha map */
 439     if (!image->common.alpha_map)
 440     {
 441         flags |= FAST_PATH_NO_ALPHA_MAP;
 442     }
 443     else
 444     {
 445         if (PIXMAN_FORMAT_IS_WIDE (image->common.alpha_map->format))
 446             flags &= ~FAST_PATH_NARROW_FORMAT;
 447     }
 448
 449     /* Both alpha maps and convolution filters can introduce
 450      * non-opaqueness in otherwise opaque images. Also
 451      * an image with component alpha turned on is only opaque
 452      * if all channels are opaque, so we simply turn it off
 453      * unconditionally for those images.
 454      */
 455     if (image->common.alpha_map                                 ||
 456         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 457         image->common.component_alpha)
 458     {
 459         flags &= ~(FAST_PATH_IS_OPAQUE | FAST_PATH_SAMPLES_OPAQUE);
 460     }
 461
 462     image->common.flags = flags;
 463     image->common.extended_format_code = code;
 464 }
 465
 466 void
 467 _pixman_image_validate (pixman_image_t *image)
 468 {
 469     if (image->common.dirty)
 470     {
 471         compute_image_info (image);
 472
 473         /* It is important that property_changed is
 474          * called *after* compute_image_info() because
 475          * property_changed() can make use of the flags
 476          * to set up accessors etc.
 477          */
 478         if (image->common.property_changed)
 479             image->common.property_changed (image);
 480
 481         image->common.dirty = FALSE;
 482     }
 483
 484     if (image->common.alpha_map)
 485         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 486 }
 487
 488 PIXMAN_EXPORT pixman_bool_t
 489 pixman_image_set_clip_region32 (pixman_image_t *   image,
 490                                 pixman_region32_t *region)
 491 {
 492     image_common_t *common = (image_common_t *)image;
 493     pixman_bool_t result;
 494
 495     if (region)
 496     {
 497         if ((result = pixman_region32_copy (&common->clip_region, region)))
 498             image->common.have_clip_region = TRUE;
 499     }
 500     else
 501     {
 502         _pixman_image_reset_clip_region (image);
 503
 504         result = TRUE;
 505     }
 506
 507     image_property_changed (image);
 508
 509     return result;
 510 }
 511
 512 PIXMAN_EXPORT pixman_bool_t
 513 pixman_image_set_clip_region (pixman_image_t *   image,
 514                               pixman_region16_t *region)
 515 {
 516     image_common_t *common = (image_common_t *)image;
 517     pixman_bool_t result;
 518
 519     if (region)
 520     {
 521         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 522             image->common.have_clip_region = TRUE;
 523     }
 524     else
 525     {
 526         _pixman_image_reset_clip_region (image);
 527
 528         result = TRUE;
 529     }
 530
 531     image_property_changed (image);
 532
 533     return result;
 534 }
 535
 536 PIXMAN_EXPORT void
 537 pixman_image_set_has_client_clip (pixman_image_t *image,
 538                                   pixman_bool_t   client_clip)
 539 {
 540     image->common.client_clip = client_clip;
 541 }
 542
 543 PIXMAN_EXPORT pixman_bool_t
 544 pixman_image_set_transform (pixman_image_t *          image,
 545                             const pixman_transform_t *transform)
 546 {
 547     static const pixman_transform_t id =
 548     {
 549         { { pixman_fixed_1, 0, 0 },
 550           { 0, pixman_fixed_1, 0 },
 551           { 0, 0, pixman_fixed_1 } }
 552     };
 553
 554     image_common_t *common = (image_common_t *)image;
 555     pixman_bool_t result;
 556
 557     if (common->transform == transform)
 558         return TRUE;
 559
 560     if (!transform || memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 561     {
 562         free (common->transform);
 563         common->transform = NULL;
 564         result = TRUE;
 565
 566         goto out;
 567     }
 568
 569     if (common->transform &&
 570         memcmp (common->transform, transform, sizeof (pixman_transform_t) == 0))
 571     {
 572         return TRUE;
 573     }
 574
 575     if (common->transform == NULL)
 576         common->transform = malloc (sizeof (pixman_transform_t));
 577
 578     if (common->transform == NULL)
 579     {
 580         result = FALSE;
 581
 582         goto out;
 583     }
 584
 585     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 586
 587     result = TRUE;
 588
 589 out:
 590     image_property_changed (image);
 591
 592     return result;
 593 }
 594
 595 PIXMAN_EXPORT void
 596 pixman_image_set_repeat (pixman_image_t *image,
 597                          pixman_repeat_t repeat)
 598 {
 599     if (image->common.repeat == repeat)
 600         return;
 601
 602     image->common.repeat = repeat;
 603
 604     image_property_changed (image);
 605 }
 606
 607 PIXMAN_EXPORT pixman_bool_t
 608 pixman_image_set_filter (pixman_image_t *      image,
 609                          pixman_filter_t       filter,
 610                          const pixman_fixed_t *params,
 611                          int                   n_params)
 612 {
 613     image_common_t *common = (image_common_t *)image;
 614     pixman_fixed_t *new_params;
 615
 616     if (params == common->filter_params && filter == common->filter)
 617         return TRUE;
 618
 619     new_params = NULL;
 620     if (params)
 621     {
 622         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 623         if (!new_params)
 624             return FALSE;
 625
 626         memcpy (new_params,
 627                 params, n_params * sizeof (pixman_fixed_t));
 628     }
 629
 630     common->filter = filter;
 631
 632     if (common->filter_params)
 633         free (common->filter_params);
 634
 635     common->filter_params = new_params;
 636     common->n_filter_params = n_params;
 637
 638     image_property_changed (image);
 639     return TRUE;
 640 }
 641
 642 PIXMAN_EXPORT void
 643 pixman_image_set_source_clipping (pixman_image_t *image,
 644                                   pixman_bool_t   clip_sources)
 645 {
 646     if (image->common.clip_sources == clip_sources)
 647         return;
 648
 649     image->common.clip_sources = clip_sources;
 650
 651     image_property_changed (image);
 652 }
 653
 654 /* Unlike all the other property setters, this function does not
 655  * copy the content of indexed. Doing this copying is simply
 656  * way, way too expensive.
 657  */
 658 PIXMAN_EXPORT void
 659 pixman_image_set_indexed (pixman_image_t *        image,
 660                           const pixman_indexed_t *indexed)
 661 {
 662     bits_image_t *bits = (bits_image_t *)image;
 663
 664     if (bits->indexed == indexed)
 665         return;
 666
 667     bits->indexed = indexed;
 668
 669     image_property_changed (image);
 670 }
 671
 672 PIXMAN_EXPORT void
 673 pixman_image_set_alpha_map (pixman_image_t *image,
 674                             pixman_image_t *alpha_map,
 675                             int16_t         x,
 676                             int16_t         y)
 677 {
 678     image_common_t *common = (image_common_t *)image;
 679
 680     return_if_fail (!alpha_map || alpha_map->type == BITS);
 681
 682     if (alpha_map && common->alpha_count > 0)
 683     {
 684         /* If this image is being used as an alpha map itself,
 685          * then you can't give it an alpha map of its own.
 686          */
 687         return;
 688     }
 689
 690     if (alpha_map && alpha_map->common.alpha_map)
 691     {
 692         /* If the image has an alpha map of its own,
 693          * then it can't be used as an alpha map itself
 694          */
 695         return;
 696     }
 697
 698     if (common->alpha_map != (bits_image_t *)alpha_map)
 699     {
 700         if (common->alpha_map)
 701         {
 702             common->alpha_map->common.alpha_count--;
 703
 704             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 705         }
 706
 707         if (alpha_map)
 708         {
 709             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 710
 711             common->alpha_map->common.alpha_count++;
 712         }
 713         else
 714         {
 715             common->alpha_map = NULL;
 716         }
 717     }
 718
 719     common->alpha_origin_x = x;
 720     common->alpha_origin_y = y;
 721
 722     image_property_changed (image);
 723 }
 724
 725 PIXMAN_EXPORT void
 726 pixman_image_set_component_alpha   (pixman_image_t *image,
 727                                     pixman_bool_t   component_alpha)
 728 {
 729     if (image->common.component_alpha == component_alpha)
 730         return;
 731
 732     image->common.component_alpha = component_alpha;
 733
 734     image_property_changed (image);
 735 }
 736
 737 PIXMAN_EXPORT pixman_bool_t
 738 pixman_image_get_component_alpha   (pixman_image_t       *image)
 739 {
 740     return image->common.component_alpha;
 741 }
 742
 743 PIXMAN_EXPORT void
 744 pixman_image_set_accessors (pixman_image_t *           image,
 745                             pixman_read_memory_func_t  read_func,
 746                             pixman_write_memory_func_t write_func)
 747 {
 748     return_if_fail (image != NULL);
 749
 750     if (image->type == BITS)
 751     {
 752         image->bits.read_func = read_func;
 753         image->bits.write_func = write_func;
 754
 755         image_property_changed (image);
 756     }
 757 }
 758
 759 PIXMAN_EXPORT uint32_t *
 760 pixman_image_get_data (pixman_image_t *image)
 761 {
 762     if (image->type == BITS)
 763         return image->bits.bits;
 764
 765     return NULL;
 766 }
 767
 768 PIXMAN_EXPORT int
 769 pixman_image_get_width (pixman_image_t *image)
 770 {
 771     if (image->type == BITS)
 772         return image->bits.width;
 773
 774     return 0;
 775 }
 776
 777 PIXMAN_EXPORT int
 778 pixman_image_get_height (pixman_image_t *image)
 779 {
 780     if (image->type == BITS)
 781         return image->bits.height;
 782
 783     return 0;
 784 }
 785
 786 PIXMAN_EXPORT int
 787 pixman_image_get_stride (pixman_image_t *image)
 788 {
 789     if (image->type == BITS)
 790         return image->bits.rowstride * (int) sizeof (uint32_t);
 791
 792     return 0;
 793 }
 794
 795 PIXMAN_EXPORT int
 796 pixman_image_get_depth (pixman_image_t *image)
 797 {
 798     if (image->type == BITS)
 799         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 800
 801     return 0;
 802 }
 803
 804 PIXMAN_EXPORT pixman_format_code_t
 805 pixman_image_get_format (pixman_image_t *image)
 806 {
 807     if (image->type == BITS)
 808         return image->bits.format;
 809
 810     return 0;
 811 }
 812
 813 uint32_t
 814 _pixman_image_get_solid (pixman_implementation_t *imp,
 815                          pixman_image_t *         image,
 816                          pixman_format_code_t     format)
 817 {
 818     uint32_t result;
 819     pixman_iter_t iter;
 820
 821     _pixman_implementation_src_iter_init (
 822         imp, &iter, image, 0, 0, 1, 1,
 823         (uint8_t *)&result, ITER_NARROW);
 824
 825     result = *iter.get_scanline (&iter, NULL);
 826
 827     /* If necessary, convert RGB <--> BGR. */
 828     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 829     {
 830         result = (((result & 0xff000000) >>  0) |
 831                   ((result & 0x00ff0000) >> 16) |
 832                   ((result & 0x0000ff00) >>  0) |
 833                   ((result & 0x000000ff) << 16));
 834     }
 835
 836     return result;
 837 }