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 |= FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_PAD_REPEAT | FAST_PATH_NO_NORMAL_REPEAT;
 357         break;
 358
 359     case PIXMAN_REPEAT_REFLECT:
 360         flags |= FAST_PATH_NO_PAD_REPEAT | FAST_PATH_NO_NONE_REPEAT | FAST_PATH_NO_NORMAL_REPEAT;
 361         break;
 362
 363     case PIXMAN_REPEAT_PAD:
 364         flags |= FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_NONE_REPEAT | FAST_PATH_NO_NORMAL_REPEAT;
 365         break;
 366
 367     default:
 368         flags |= FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_PAD_REPEAT | FAST_PATH_NO_NONE_REPEAT;
 369         break;
 370     }
 371
 372     /* Component alpha */
 373     if (image->common.component_alpha)
 374         flags |= FAST_PATH_COMPONENT_ALPHA;
 375     else
 376         flags |= FAST_PATH_UNIFIED_ALPHA;
 377
 378     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NARROW_FORMAT);
 379
 380     /* Type specific checks */
 381     switch (image->type)
 382     {
 383     case SOLID:
 384         code = PIXMAN_solid;
 385
 386         if (image->solid.color.alpha == 0xffff)
 387             flags |= FAST_PATH_IS_OPAQUE;
 388         break;
 389
 390     case BITS:
 391         if (image->bits.width == 1      &&
 392             image->bits.height == 1     &&
 393             image->common.repeat != PIXMAN_REPEAT_NONE)
 394         {
 395             code = PIXMAN_solid;
 396         }
 397         else
 398         {
 399             code = image->bits.format;
 400
 401             if (!image->common.transform &&
 402                 image->common.repeat == PIXMAN_REPEAT_NORMAL)
 403             {
 404                 flags |= FAST_PATH_SIMPLE_REPEAT;
 405             }
 406         }
 407
 408         if (!PIXMAN_FORMAT_A (image->bits.format)                               &&
 409             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_GRAY         &&
 410             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_COLOR)
 411         {
 412             flags |= FAST_PATH_SAMPLES_OPAQUE;
 413
 414             if (image->common.repeat != PIXMAN_REPEAT_NONE)
 415                 flags |= FAST_PATH_IS_OPAQUE;
 416         }
 417
 418         if (source_image_needs_out_of_bounds_workaround (&image->bits))
 419             flags |= FAST_PATH_NEEDS_WORKAROUND;
 420
 421         if (image->bits.read_func || image->bits.write_func)
 422             flags &= ~FAST_PATH_NO_ACCESSORS;
 423
 424         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 425             flags &= ~FAST_PATH_NARROW_FORMAT;
 426         break;
 427
 428     case LINEAR:
 429     case RADIAL:
 430         code = PIXMAN_unknown;
 431
 432         if (image->common.repeat != PIXMAN_REPEAT_NONE)
 433         {
 434             int i;
 435
 436             flags |= FAST_PATH_IS_OPAQUE;
 437             for (i = 0; i < image->gradient.n_stops; ++i)
 438             {
 439                 if (image->gradient.stops[i].color.alpha != 0xffff)
 440                 {
 441                     flags &= ~FAST_PATH_IS_OPAQUE;
 442                     break;
 443                 }
 444             }
 445         }
 446         break;
 447
 448     default:
 449         code = PIXMAN_unknown;
 450         break;
 451     }
 452
 453     /* Alpha map */
 454     if (!image->common.alpha_map)
 455     {
 456         flags |= FAST_PATH_NO_ALPHA_MAP;
 457     }
 458     else
 459     {
 460         if (PIXMAN_FORMAT_IS_WIDE (image->common.alpha_map->format))
 461             flags &= ~FAST_PATH_NARROW_FORMAT;
 462     }
 463
 464     /* Both alpha maps and convolution filters can introduce
 465      * non-opaqueness in otherwise opaque images. Also
 466      * an image with component alpha turned on is only opaque
 467      * if all channels are opaque, so we simply turn it off
 468      * unconditionally for those images.
 469      */
 470     if (image->common.alpha_map                                 ||
 471         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 472         image->common.component_alpha)
 473     {
 474         flags &= ~(FAST_PATH_IS_OPAQUE | FAST_PATH_SAMPLES_OPAQUE);
 475     }
 476
 477     image->common.flags = flags;
 478     image->common.extended_format_code = code;
 479 }
 480
 481 void
 482 _pixman_image_validate (pixman_image_t *image)
 483 {
 484     if (image->common.dirty)
 485     {
 486         compute_image_info (image);
 487
 488         /* It is important that property_changed is
 489          * called *after* compute_image_info() because
 490          * property_changed() can make use of the flags
 491          * to set up accessors etc.
 492          */
 493         image->common.property_changed (image);
 494
 495         image->common.dirty = FALSE;
 496     }
 497
 498     if (image->common.alpha_map)
 499         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 500 }
 501
 502 PIXMAN_EXPORT pixman_bool_t
 503 pixman_image_set_clip_region32 (pixman_image_t *   image,
 504                                 pixman_region32_t *region)
 505 {
 506     image_common_t *common = (image_common_t *)image;
 507     pixman_bool_t result;
 508
 509     if (region)
 510     {
 511         if ((result = pixman_region32_copy (&common->clip_region, region)))
 512             image->common.have_clip_region = TRUE;
 513     }
 514     else
 515     {
 516         _pixman_image_reset_clip_region (image);
 517
 518         result = TRUE;
 519     }
 520
 521     image_property_changed (image);
 522
 523     return result;
 524 }
 525
 526 PIXMAN_EXPORT pixman_bool_t
 527 pixman_image_set_clip_region (pixman_image_t *   image,
 528                               pixman_region16_t *region)
 529 {
 530     image_common_t *common = (image_common_t *)image;
 531     pixman_bool_t result;
 532
 533     if (region)
 534     {
 535         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 536             image->common.have_clip_region = TRUE;
 537     }
 538     else
 539     {
 540         _pixman_image_reset_clip_region (image);
 541
 542         result = TRUE;
 543     }
 544
 545     image_property_changed (image);
 546
 547     return result;
 548 }
 549
 550 PIXMAN_EXPORT void
 551 pixman_image_set_has_client_clip (pixman_image_t *image,
 552                                   pixman_bool_t   client_clip)
 553 {
 554     image->common.client_clip = client_clip;
 555 }
 556
 557 PIXMAN_EXPORT pixman_bool_t
 558 pixman_image_set_transform (pixman_image_t *          image,
 559                             const pixman_transform_t *transform)
 560 {
 561     static const pixman_transform_t id =
 562     {
 563         { { pixman_fixed_1, 0, 0 },
 564           { 0, pixman_fixed_1, 0 },
 565           { 0, 0, pixman_fixed_1 } }
 566     };
 567
 568     image_common_t *common = (image_common_t *)image;
 569     pixman_bool_t result;
 570
 571     if (common->transform == transform)
 572         return TRUE;
 573
 574     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 575     {
 576         free (common->transform);
 577         common->transform = NULL;
 578         result = TRUE;
 579
 580         goto out;
 581     }
 582
 583     if (common->transform == NULL)
 584         common->transform = malloc (sizeof (pixman_transform_t));
 585
 586     if (common->transform == NULL)
 587     {
 588         result = FALSE;
 589
 590         goto out;
 591     }
 592
 593     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 594
 595     result = TRUE;
 596
 597 out:
 598     image_property_changed (image);
 599
 600     return result;
 601 }
 602
 603 PIXMAN_EXPORT void
 604 pixman_image_set_repeat (pixman_image_t *image,
 605                          pixman_repeat_t repeat)
 606 {
 607     image->common.repeat = repeat;
 608
 609     image_property_changed (image);
 610 }
 611
 612 PIXMAN_EXPORT pixman_bool_t
 613 pixman_image_set_filter (pixman_image_t *      image,
 614                          pixman_filter_t       filter,
 615                          const pixman_fixed_t *params,
 616                          int                   n_params)
 617 {
 618     image_common_t *common = (image_common_t *)image;
 619     pixman_fixed_t *new_params;
 620
 621     if (params == common->filter_params && filter == common->filter)
 622         return TRUE;
 623
 624     new_params = NULL;
 625     if (params)
 626     {
 627         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 628         if (!new_params)
 629             return FALSE;
 630
 631         memcpy (new_params,
 632                 params, n_params * sizeof (pixman_fixed_t));
 633     }
 634
 635     common->filter = filter;
 636
 637     if (common->filter_params)
 638         free (common->filter_params);
 639
 640     common->filter_params = new_params;
 641     common->n_filter_params = n_params;
 642
 643     image_property_changed (image);
 644     return TRUE;
 645 }
 646
 647 PIXMAN_EXPORT void
 648 pixman_image_set_source_clipping (pixman_image_t *image,
 649                                   pixman_bool_t   clip_sources)
 650 {
 651     image->common.clip_sources = clip_sources;
 652
 653     image_property_changed (image);
 654 }
 655
 656 /* Unlike all the other property setters, this function does not
 657  * copy the content of indexed. Doing this copying is simply
 658  * way, way too expensive.
 659  */
 660 PIXMAN_EXPORT void
 661 pixman_image_set_indexed (pixman_image_t *        image,
 662                           const pixman_indexed_t *indexed)
 663 {
 664     bits_image_t *bits = (bits_image_t *)image;
 665
 666     bits->indexed = indexed;
 667
 668     image_property_changed (image);
 669 }
 670
 671 PIXMAN_EXPORT void
 672 pixman_image_set_alpha_map (pixman_image_t *image,
 673                             pixman_image_t *alpha_map,
 674                             int16_t         x,
 675                             int16_t         y)
 676 {
 677     image_common_t *common = (image_common_t *)image;
 678
 679     return_if_fail (!alpha_map || alpha_map->type == BITS);
 680
 681     if (alpha_map && common->alpha_count > 0)
 682     {
 683         /* If this image is being used as an alpha map itself,
 684          * then you can't give it an alpha map of its own.
 685          */
 686         return;
 687     }
 688
 689     if (alpha_map && alpha_map->common.alpha_map)
 690     {
 691         /* If the image has an alpha map of its own,
 692          * then it can't be used as an alpha map itself
 693          */
 694         return;
 695     }
 696
 697     if (common->alpha_map != (bits_image_t *)alpha_map)
 698     {
 699         if (common->alpha_map)
 700         {
 701             common->alpha_map->common.alpha_count--;
 702
 703             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 704         }
 705
 706         if (alpha_map)
 707         {
 708             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 709
 710             common->alpha_map->common.alpha_count++;
 711         }
 712         else
 713         {
 714             common->alpha_map = NULL;
 715         }
 716     }
 717
 718     common->alpha_origin_x = x;
 719     common->alpha_origin_y = y;
 720
 721     image_property_changed (image);
 722 }
 723
 724 PIXMAN_EXPORT void
 725 pixman_image_set_component_alpha   (pixman_image_t *image,
 726                                     pixman_bool_t   component_alpha)
 727 {
 728     image->common.component_alpha = component_alpha;
 729
 730     image_property_changed (image);
 731 }
 732
 733 PIXMAN_EXPORT pixman_bool_t
 734 pixman_image_get_component_alpha   (pixman_image_t       *image)
 735 {
 736     return image->common.component_alpha;
 737 }
 738
 739 PIXMAN_EXPORT void
 740 pixman_image_set_accessors (pixman_image_t *           image,
 741                             pixman_read_memory_func_t  read_func,
 742                             pixman_write_memory_func_t write_func)
 743 {
 744     return_if_fail (image != NULL);
 745
 746     if (image->type == BITS)
 747     {
 748         image->bits.read_func = read_func;
 749         image->bits.write_func = write_func;
 750
 751         image_property_changed (image);
 752     }
 753 }
 754
 755 PIXMAN_EXPORT uint32_t *
 756 pixman_image_get_data (pixman_image_t *image)
 757 {
 758     if (image->type == BITS)
 759         return image->bits.bits;
 760
 761     return NULL;
 762 }
 763
 764 PIXMAN_EXPORT int
 765 pixman_image_get_width (pixman_image_t *image)
 766 {
 767     if (image->type == BITS)
 768         return image->bits.width;
 769
 770     return 0;
 771 }
 772
 773 PIXMAN_EXPORT int
 774 pixman_image_get_height (pixman_image_t *image)
 775 {
 776     if (image->type == BITS)
 777         return image->bits.height;
 778
 779     return 0;
 780 }
 781
 782 PIXMAN_EXPORT int
 783 pixman_image_get_stride (pixman_image_t *image)
 784 {
 785     if (image->type == BITS)
 786         return image->bits.rowstride * (int) sizeof (uint32_t);
 787
 788     return 0;
 789 }
 790
 791 PIXMAN_EXPORT int
 792 pixman_image_get_depth (pixman_image_t *image)
 793 {
 794     if (image->type == BITS)
 795         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 796
 797     return 0;
 798 }
 799
 800 PIXMAN_EXPORT pixman_format_code_t
 801 pixman_image_get_format (pixman_image_t *image)
 802 {
 803     if (image->type == BITS)
 804         return image->bits.format;
 805
 806     return 0;
 807 }
 808
 809 uint32_t
 810 _pixman_image_get_solid (pixman_image_t *     image,
 811                          pixman_format_code_t format)
 812 {
 813     uint32_t result;
 814
 815     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL);
 816
 817     /* If necessary, convert RGB <--> BGR. */
 818     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 819     {
 820         result = (((result & 0xff000000) >>  0) |
 821                   ((result & 0x00ff0000) >> 16) |
 822                   ((result & 0x0000ff00) >>  0) |
 823                   ((result & 0x000000ff) << 16));
 824     }
 825
 826     return result;
 827 }