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 #include "pixman-combine32.h"
  34
  35 pixman_bool_t
  36 _pixman_init_gradient (gradient_t *                  gradient,
  37                        const pixman_gradient_stop_t *stops,
  38                        int                           n_stops)
  39 {
  40     return_val_if_fail (n_stops > 0, FALSE);
  41
  42     gradient->stops = pixman_malloc_ab (n_stops, sizeof (pixman_gradient_stop_t));
  43     if (!gradient->stops)
  44         return FALSE;
  45
  46     memcpy (gradient->stops, stops, n_stops * sizeof (pixman_gradient_stop_t));
  47
  48     gradient->n_stops = n_stops;
  49
  50     gradient->stop_range = 0xffff;
  51     gradient->common.class = SOURCE_IMAGE_CLASS_UNKNOWN;
  52
  53     return TRUE;
  54 }
  55
  56 /*
  57  * By default, just evaluate the image at 32bpp and expand.  Individual image
  58  * types can plug in a better scanline getter if they want to. For example
  59  * we  could produce smoother gradients by evaluating them at higher color
  60  * depth, but that's a project for the future.
  61  */
  62 void
  63 _pixman_image_get_scanline_generic_64 (pixman_image_t * image,
  64                                        int              x,
  65                                        int              y,
  66                                        int              width,
  67                                        uint32_t *       buffer,
  68                                        const uint32_t * mask)
  69 {
  70     uint32_t *mask8 = NULL;
  71
  72     /* Contract the mask image, if one exists, so that the 32-bit fetch
  73      * function can use it.
  74      */
  75     if (mask)
  76     {
  77         mask8 = pixman_malloc_ab (width, sizeof(uint32_t));
  78         if (!mask8)
  79             return;
  80
  81         pixman_contract (mask8, (uint64_t *)mask, width);
  82     }
  83
  84     /* Fetch the source image into the first half of buffer. */
  85     _pixman_image_get_scanline_32 (image, x, y, width, (uint32_t*)buffer, mask8);
  86
  87     /* Expand from 32bpp to 64bpp in place. */
  88     pixman_expand ((uint64_t *)buffer, buffer, PIXMAN_a8r8g8b8, width);
  89
  90     free (mask8);
  91 }
  92
  93 pixman_image_t *
  94 _pixman_image_allocate (void)
  95 {
  96     pixman_image_t *image = malloc (sizeof (pixman_image_t));
  97
  98     if (image)
  99     {
 100         image_common_t *common = &image->common;
 101
 102         pixman_region32_init (&common->clip_region);
 103
 104         common->alpha_count = 0;
 105         common->have_clip_region = FALSE;
 106         common->clip_sources = FALSE;
 107         common->transform = NULL;
 108         common->repeat = PIXMAN_REPEAT_NONE;
 109         common->filter = PIXMAN_FILTER_NEAREST;
 110         common->filter_params = NULL;
 111         common->n_filter_params = 0;
 112         common->alpha_map = NULL;
 113         common->component_alpha = FALSE;
 114         common->ref_count = 1;
 115         common->classify = NULL;
 116         common->client_clip = FALSE;
 117         common->destroy_func = NULL;
 118         common->destroy_data = NULL;
 119         common->dirty = TRUE;
 120     }
 121
 122     return image;
 123 }
 124
 125 source_image_class_t
 126 _pixman_image_classify (pixman_image_t *image,
 127                         int             x,
 128                         int             y,
 129                         int             width,
 130                         int             height)
 131 {
 132     if (image->common.classify)
 133         return image->common.classify (image, x, y, width, height);
 134     else
 135         return SOURCE_IMAGE_CLASS_UNKNOWN;
 136 }
 137
 138 void
 139 _pixman_image_get_scanline_32 (pixman_image_t *image,
 140                                int             x,
 141                                int             y,
 142                                int             width,
 143                                uint32_t *      buffer,
 144                                const uint32_t *mask)
 145 {
 146     image->common.get_scanline_32 (image, x, y, width, buffer, mask);
 147 }
 148
 149 /* Even thought the type of buffer is uint32_t *, the function actually expects
 150  * a uint64_t *buffer.
 151  */
 152 void
 153 _pixman_image_get_scanline_64 (pixman_image_t *image,
 154                                int             x,
 155                                int             y,
 156                                int             width,
 157                                uint32_t *      buffer,
 158                                const uint32_t *unused)
 159 {
 160     image->common.get_scanline_64 (image, x, y, width, buffer, unused);
 161 }
 162
 163 static void
 164 image_property_changed (pixman_image_t *image)
 165 {
 166     image->common.dirty = TRUE;
 167 }
 168
 169 /* Ref Counting */
 170 PIXMAN_EXPORT pixman_image_t *
 171 pixman_image_ref (pixman_image_t *image)
 172 {
 173     image->common.ref_count++;
 174
 175     return image;
 176 }
 177
 178 /* returns TRUE when the image is freed */
 179 PIXMAN_EXPORT pixman_bool_t
 180 pixman_image_unref (pixman_image_t *image)
 181 {
 182     image_common_t *common = (image_common_t *)image;
 183
 184     common->ref_count--;
 185
 186     if (common->ref_count == 0)
 187     {
 188         if (image->common.destroy_func)
 189             image->common.destroy_func (image, image->common.destroy_data);
 190
 191         pixman_region32_fini (&common->clip_region);
 192
 193         if (common->transform)
 194             free (common->transform);
 195
 196         if (common->filter_params)
 197             free (common->filter_params);
 198
 199         if (common->alpha_map)
 200             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 201
 202         if (image->type == LINEAR ||
 203             image->type == RADIAL ||
 204             image->type == CONICAL)
 205         {
 206             if (image->gradient.stops)
 207                 free (image->gradient.stops);
 208         }
 209
 210         if (image->type == BITS && image->bits.free_me)
 211             free (image->bits.free_me);
 212
 213         free (image);
 214
 215         return TRUE;
 216     }
 217
 218     return FALSE;
 219 }
 220
 221 PIXMAN_EXPORT void
 222 pixman_image_set_destroy_function (pixman_image_t *            image,
 223                                    pixman_image_destroy_func_t func,
 224                                    void *                      data)
 225 {
 226     image->common.destroy_func = func;
 227     image->common.destroy_data = data;
 228 }
 229
 230 PIXMAN_EXPORT void *
 231 pixman_image_get_destroy_data (pixman_image_t *image)
 232 {
 233   return image->common.destroy_data;
 234 }
 235
 236 void
 237 _pixman_image_reset_clip_region (pixman_image_t *image)
 238 {
 239     image->common.have_clip_region = FALSE;
 240 }
 241
 242 static pixman_bool_t out_of_bounds_workaround = TRUE;
 243
 244 /* Old X servers rely on out-of-bounds accesses when they are asked
 245  * to composite with a window as the source. They create a pixman image
 246  * pointing to some bogus position in memory, but then they set a clip
 247  * region to the position where the actual bits are.
 248  *
 249  * Due to a bug in old versions of pixman, where it would not clip
 250  * against the image bounds when a clip region was set, this would
 251  * actually work. So by default we allow certain out-of-bound access
 252  * to happen unless explicitly disabled.
 253  *
 254  * Fixed X servers should call this function to disable the workaround.
 255  */
 256 PIXMAN_EXPORT void
 257 pixman_disable_out_of_bounds_workaround (void)
 258 {
 259     out_of_bounds_workaround = FALSE;
 260 }
 261
 262 static pixman_bool_t
 263 source_image_needs_out_of_bounds_workaround (bits_image_t *image)
 264 {
 265     if (image->common.clip_sources                      &&
 266         image->common.repeat == PIXMAN_REPEAT_NONE      &&
 267         image->common.have_clip_region                  &&
 268         out_of_bounds_workaround)
 269     {
 270         if (!image->common.client_clip)
 271         {
 272             /* There is no client clip, so if the clip region extends beyond the
 273              * drawable geometry, it must be because the X server generated the
 274              * bogus clip region.
 275              */
 276             const pixman_box32_t *extents =
 277                 pixman_region32_extents (&image->common.clip_region);
 278
 279             if (extents->x1 >= 0 && extents->x2 <= image->width &&
 280                 extents->y1 >= 0 && extents->y2 <= image->height)
 281             {
 282                 return FALSE;
 283             }
 284         }
 285
 286         return TRUE;
 287     }
 288
 289     return FALSE;
 290 }
 291
 292 static void
 293 compute_image_info (pixman_image_t *image)
 294 {
 295     pixman_format_code_t code;
 296     uint32_t flags = 0;
 297
 298     /* Transform */
 299     if (!image->common.transform)
 300     {
 301         flags |= (FAST_PATH_ID_TRANSFORM        |
 302                   FAST_PATH_X_UNIT_POSITIVE     |
 303                   FAST_PATH_Y_UNIT_ZERO         |
 304                   FAST_PATH_AFFINE_TRANSFORM);
 305     }
 306     else
 307     {
 308         flags |= FAST_PATH_HAS_TRANSFORM;
 309
 310         if (image->common.transform->matrix[2][0] == 0                  &&
 311             image->common.transform->matrix[2][1] == 0                  &&
 312             image->common.transform->matrix[2][2] == pixman_fixed_1)
 313         {
 314             flags |= FAST_PATH_AFFINE_TRANSFORM;
 315
 316             if (image->common.transform->matrix[0][1] == 0 &&
 317                 image->common.transform->matrix[1][0] == 0)
 318             {
 319                 flags |= FAST_PATH_SCALE_TRANSFORM;
 320             }
 321         }
 322
 323         if (image->common.transform->matrix[0][0] > 0)
 324             flags |= FAST_PATH_X_UNIT_POSITIVE;
 325
 326         if (image->common.transform->matrix[1][0] == 0)
 327             flags |= FAST_PATH_Y_UNIT_ZERO;
 328     }
 329
 330     /* Filter */
 331     switch (image->common.filter)
 332     {
 333     case PIXMAN_FILTER_NEAREST:
 334     case PIXMAN_FILTER_FAST:
 335         flags |= (FAST_PATH_NEAREST_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 336         break;
 337
 338     case PIXMAN_FILTER_BILINEAR:
 339     case PIXMAN_FILTER_GOOD:
 340     case PIXMAN_FILTER_BEST:
 341         flags |= (FAST_PATH_BILINEAR_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 342         break;
 343
 344     case PIXMAN_FILTER_CONVOLUTION:
 345         break;
 346
 347     default:
 348         flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
 349         break;
 350     }
 351
 352     /* Repeat mode */
 353     switch (image->common.repeat)
 354     {
 355     case PIXMAN_REPEAT_NONE:
 356         flags |=
 357             FAST_PATH_NO_REFLECT_REPEAT         |
 358             FAST_PATH_NO_PAD_REPEAT             |
 359             FAST_PATH_NO_NORMAL_REPEAT;
 360         break;
 361
 362     case PIXMAN_REPEAT_REFLECT:
 363         flags |=
 364             FAST_PATH_NO_PAD_REPEAT             |
 365             FAST_PATH_NO_NONE_REPEAT            |
 366             FAST_PATH_NO_NORMAL_REPEAT;
 367         break;
 368
 369     case PIXMAN_REPEAT_PAD:
 370         flags |=
 371             FAST_PATH_NO_REFLECT_REPEAT         |
 372             FAST_PATH_NO_NONE_REPEAT            |
 373             FAST_PATH_NO_NORMAL_REPEAT;
 374         break;
 375
 376     default:
 377         flags |=
 378             FAST_PATH_NO_REFLECT_REPEAT         |
 379             FAST_PATH_NO_PAD_REPEAT             |
 380             FAST_PATH_NO_NONE_REPEAT;
 381         break;
 382     }
 383
 384     /* Component alpha */
 385     if (image->common.component_alpha)
 386         flags |= FAST_PATH_COMPONENT_ALPHA;
 387     else
 388         flags |= FAST_PATH_UNIFIED_ALPHA;
 389
 390     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NARROW_FORMAT);
 391
 392     /* Type specific checks */
 393     switch (image->type)
 394     {
 395     case SOLID:
 396         code = PIXMAN_solid;
 397
 398         if (image->solid.color.alpha == 0xffff)
 399             flags |= FAST_PATH_IS_OPAQUE;
 400         break;
 401
 402     case BITS:
 403         if (image->bits.width == 1      &&
 404             image->bits.height == 1     &&
 405             image->common.repeat != PIXMAN_REPEAT_NONE)
 406         {
 407             code = PIXMAN_solid;
 408         }
 409         else
 410         {
 411             code = image->bits.format;
 412         }
 413
 414         if (!PIXMAN_FORMAT_A (image->bits.format)                               &&
 415             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_GRAY         &&
 416             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_COLOR)
 417         {
 418             flags |= FAST_PATH_SAMPLES_OPAQUE;
 419
 420             if (image->common.repeat != PIXMAN_REPEAT_NONE)
 421                 flags |= FAST_PATH_IS_OPAQUE;
 422         }
 423
 424         if (source_image_needs_out_of_bounds_workaround (&image->bits))
 425             flags |= FAST_PATH_NEEDS_WORKAROUND;
 426
 427         if (image->bits.read_func || image->bits.write_func)
 428             flags &= ~FAST_PATH_NO_ACCESSORS;
 429
 430         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 431             flags &= ~FAST_PATH_NARROW_FORMAT;
 432         break;
 433
 434     case LINEAR:
 435     case RADIAL:
 436         code = PIXMAN_unknown;
 437
 438         if (image->common.repeat != PIXMAN_REPEAT_NONE)
 439         {
 440             int i;
 441
 442             flags |= FAST_PATH_IS_OPAQUE;
 443             for (i = 0; i < image->gradient.n_stops; ++i)
 444             {
 445                 if (image->gradient.stops[i].color.alpha != 0xffff)
 446                 {
 447                     flags &= ~FAST_PATH_IS_OPAQUE;
 448                     break;
 449                 }
 450             }
 451         }
 452         break;
 453
 454     default:
 455         code = PIXMAN_unknown;
 456         break;
 457     }
 458
 459     /* Alpha map */
 460     if (!image->common.alpha_map)
 461     {
 462         flags |= FAST_PATH_NO_ALPHA_MAP;
 463     }
 464     else
 465     {
 466         if (PIXMAN_FORMAT_IS_WIDE (image->common.alpha_map->format))
 467             flags &= ~FAST_PATH_NARROW_FORMAT;
 468     }
 469
 470     /* Both alpha maps and convolution filters can introduce
 471      * non-opaqueness in otherwise opaque images. Also
 472      * an image with component alpha turned on is only opaque
 473      * if all channels are opaque, so we simply turn it off
 474      * unconditionally for those images.
 475      */
 476     if (image->common.alpha_map                                 ||
 477         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 478         image->common.component_alpha)
 479     {
 480         flags &= ~(FAST_PATH_IS_OPAQUE | FAST_PATH_SAMPLES_OPAQUE);
 481     }
 482
 483     image->common.flags = flags;
 484     image->common.extended_format_code = code;
 485 }
 486
 487 void
 488 _pixman_image_validate (pixman_image_t *image)
 489 {
 490     if (image->common.dirty)
 491     {
 492         compute_image_info (image);
 493
 494         /* It is important that property_changed is
 495          * called *after* compute_image_info() because
 496          * property_changed() can make use of the flags
 497          * to set up accessors etc.
 498          */
 499         image->common.property_changed (image);
 500
 501         image->common.dirty = FALSE;
 502     }
 503
 504     if (image->common.alpha_map)
 505         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 506 }
 507
 508 PIXMAN_EXPORT pixman_bool_t
 509 pixman_image_set_clip_region32 (pixman_image_t *   image,
 510                                 pixman_region32_t *region)
 511 {
 512     image_common_t *common = (image_common_t *)image;
 513     pixman_bool_t result;
 514
 515     if (region)
 516     {
 517         if ((result = pixman_region32_copy (&common->clip_region, region)))
 518             image->common.have_clip_region = TRUE;
 519     }
 520     else
 521     {
 522         _pixman_image_reset_clip_region (image);
 523
 524         result = TRUE;
 525     }
 526
 527     image_property_changed (image);
 528
 529     return result;
 530 }
 531
 532 PIXMAN_EXPORT pixman_bool_t
 533 pixman_image_set_clip_region (pixman_image_t *   image,
 534                               pixman_region16_t *region)
 535 {
 536     image_common_t *common = (image_common_t *)image;
 537     pixman_bool_t result;
 538
 539     if (region)
 540     {
 541         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 542             image->common.have_clip_region = TRUE;
 543     }
 544     else
 545     {
 546         _pixman_image_reset_clip_region (image);
 547
 548         result = TRUE;
 549     }
 550
 551     image_property_changed (image);
 552
 553     return result;
 554 }
 555
 556 PIXMAN_EXPORT void
 557 pixman_image_set_has_client_clip (pixman_image_t *image,
 558                                   pixman_bool_t   client_clip)
 559 {
 560     image->common.client_clip = client_clip;
 561 }
 562
 563 PIXMAN_EXPORT pixman_bool_t
 564 pixman_image_set_transform (pixman_image_t *          image,
 565                             const pixman_transform_t *transform)
 566 {
 567     static const pixman_transform_t id =
 568     {
 569         { { pixman_fixed_1, 0, 0 },
 570           { 0, pixman_fixed_1, 0 },
 571           { 0, 0, pixman_fixed_1 } }
 572     };
 573
 574     image_common_t *common = (image_common_t *)image;
 575     pixman_bool_t result;
 576
 577     if (common->transform == transform)
 578         return TRUE;
 579
 580     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 581     {
 582         free (common->transform);
 583         common->transform = NULL;
 584         result = TRUE;
 585
 586         goto out;
 587     }
 588
 589     if (common->transform == NULL)
 590         common->transform = malloc (sizeof (pixman_transform_t));
 591
 592     if (common->transform == NULL)
 593     {
 594         result = FALSE;
 595
 596         goto out;
 597     }
 598
 599     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 600
 601     result = TRUE;
 602
 603 out:
 604     image_property_changed (image);
 605
 606     return result;
 607 }
 608
 609 PIXMAN_EXPORT void
 610 pixman_image_set_repeat (pixman_image_t *image,
 611                          pixman_repeat_t repeat)
 612 {
 613     image->common.repeat = repeat;
 614
 615     image_property_changed (image);
 616 }
 617
 618 PIXMAN_EXPORT pixman_bool_t
 619 pixman_image_set_filter (pixman_image_t *      image,
 620                          pixman_filter_t       filter,
 621                          const pixman_fixed_t *params,
 622                          int                   n_params)
 623 {
 624     image_common_t *common = (image_common_t *)image;
 625     pixman_fixed_t *new_params;
 626
 627     if (params == common->filter_params && filter == common->filter)
 628         return TRUE;
 629
 630     new_params = NULL;
 631     if (params)
 632     {
 633         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 634         if (!new_params)
 635             return FALSE;
 636
 637         memcpy (new_params,
 638                 params, n_params * sizeof (pixman_fixed_t));
 639     }
 640
 641     common->filter = filter;
 642
 643     if (common->filter_params)
 644         free (common->filter_params);
 645
 646     common->filter_params = new_params;
 647     common->n_filter_params = n_params;
 648
 649     image_property_changed (image);
 650     return TRUE;
 651 }
 652
 653 PIXMAN_EXPORT void
 654 pixman_image_set_source_clipping (pixman_image_t *image,
 655                                   pixman_bool_t   clip_sources)
 656 {
 657     image->common.clip_sources = clip_sources;
 658
 659     image_property_changed (image);
 660 }
 661
 662 /* Unlike all the other property setters, this function does not
 663  * copy the content of indexed. Doing this copying is simply
 664  * way, way too expensive.
 665  */
 666 PIXMAN_EXPORT void
 667 pixman_image_set_indexed (pixman_image_t *        image,
 668                           const pixman_indexed_t *indexed)
 669 {
 670     bits_image_t *bits = (bits_image_t *)image;
 671
 672     bits->indexed = indexed;
 673
 674     image_property_changed (image);
 675 }
 676
 677 PIXMAN_EXPORT void
 678 pixman_image_set_alpha_map (pixman_image_t *image,
 679                             pixman_image_t *alpha_map,
 680                             int16_t         x,
 681                             int16_t         y)
 682 {
 683     image_common_t *common = (image_common_t *)image;
 684
 685     return_if_fail (!alpha_map || alpha_map->type == BITS);
 686
 687     if (alpha_map && common->alpha_count > 0)
 688     {
 689         /* If this image is being used as an alpha map itself,
 690          * then you can't give it an alpha map of its own.
 691          */
 692         return;
 693     }
 694
 695     if (alpha_map && alpha_map->common.alpha_map)
 696     {
 697         /* If the image has an alpha map of its own,
 698          * then it can't be used as an alpha map itself
 699          */
 700         return;
 701     }
 702
 703     if (common->alpha_map != (bits_image_t *)alpha_map)
 704     {
 705         if (common->alpha_map)
 706         {
 707             common->alpha_map->common.alpha_count--;
 708
 709             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 710         }
 711
 712         if (alpha_map)
 713         {
 714             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 715
 716             common->alpha_map->common.alpha_count++;
 717         }
 718         else
 719         {
 720             common->alpha_map = NULL;
 721         }
 722     }
 723
 724     common->alpha_origin_x = x;
 725     common->alpha_origin_y = y;
 726
 727     image_property_changed (image);
 728 }
 729
 730 PIXMAN_EXPORT void
 731 pixman_image_set_component_alpha   (pixman_image_t *image,
 732                                     pixman_bool_t   component_alpha)
 733 {
 734     image->common.component_alpha = component_alpha;
 735
 736     image_property_changed (image);
 737 }
 738
 739 PIXMAN_EXPORT pixman_bool_t
 740 pixman_image_get_component_alpha   (pixman_image_t       *image)
 741 {
 742     return image->common.component_alpha;
 743 }
 744
 745 PIXMAN_EXPORT void
 746 pixman_image_set_accessors (pixman_image_t *           image,
 747                             pixman_read_memory_func_t  read_func,
 748                             pixman_write_memory_func_t write_func)
 749 {
 750     return_if_fail (image != NULL);
 751
 752     if (image->type == BITS)
 753     {
 754         image->bits.read_func = read_func;
 755         image->bits.write_func = write_func;
 756
 757         image_property_changed (image);
 758     }
 759 }
 760
 761 PIXMAN_EXPORT uint32_t *
 762 pixman_image_get_data (pixman_image_t *image)
 763 {
 764     if (image->type == BITS)
 765         return image->bits.bits;
 766
 767     return NULL;
 768 }
 769
 770 PIXMAN_EXPORT int
 771 pixman_image_get_width (pixman_image_t *image)
 772 {
 773     if (image->type == BITS)
 774         return image->bits.width;
 775
 776     return 0;
 777 }
 778
 779 PIXMAN_EXPORT int
 780 pixman_image_get_height (pixman_image_t *image)
 781 {
 782     if (image->type == BITS)
 783         return image->bits.height;
 784
 785     return 0;
 786 }
 787
 788 PIXMAN_EXPORT int
 789 pixman_image_get_stride (pixman_image_t *image)
 790 {
 791     if (image->type == BITS)
 792         return image->bits.rowstride * (int) sizeof (uint32_t);
 793
 794     return 0;
 795 }
 796
 797 PIXMAN_EXPORT int
 798 pixman_image_get_depth (pixman_image_t *image)
 799 {
 800     if (image->type == BITS)
 801         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 802
 803     return 0;
 804 }
 805
 806 PIXMAN_EXPORT pixman_format_code_t
 807 pixman_image_get_format (pixman_image_t *image)
 808 {
 809     if (image->type == BITS)
 810         return image->bits.format;
 811
 812     return 0;
 813 }
 814
 815 uint32_t
 816 _pixman_image_get_solid (pixman_image_t *     image,
 817                          pixman_format_code_t format)
 818 {
 819     uint32_t result;
 820
 821     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL);
 822
 823     /* If necessary, convert RGB <--> BGR. */
 824     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 825     {
 826         result = (((result & 0xff000000) >>  0) |
 827                   ((result & 0x00ff0000) >> 16) |
 828                   ((result & 0x0000ff00) >>  0) |
 829                   ((result & 0x000000ff) << 16));
 830     }
 831
 832     return result;
 833 }