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