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->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     /* Alpha map */
 330     if (!image->common.alpha_map)
 331         flags |= FAST_PATH_NO_ALPHA_MAP;
 332
 333     /* Filter */
 334     switch (image->common.filter)
 335     {
 336     case PIXMAN_FILTER_NEAREST:
 337     case PIXMAN_FILTER_FAST:
 338         flags |= (FAST_PATH_NEAREST_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 339         break;
 340
 341     case PIXMAN_FILTER_BILINEAR:
 342     case PIXMAN_FILTER_GOOD:
 343     case PIXMAN_FILTER_BEST:
 344         flags |= (FAST_PATH_BILINEAR_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 345         break;
 346
 347     case PIXMAN_FILTER_CONVOLUTION:
 348         break;
 349
 350     default:
 351         flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
 352         break;
 353     }
 354
 355     /* Repeat mode */
 356     switch (image->common.repeat)
 357     {
 358     case PIXMAN_REPEAT_NONE:
 359         flags |= FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_PAD_REPEAT | FAST_PATH_NO_NORMAL_REPEAT;
 360         break;
 361
 362     case PIXMAN_REPEAT_REFLECT:
 363         flags |= FAST_PATH_NO_PAD_REPEAT | FAST_PATH_NO_NONE_REPEAT | FAST_PATH_NO_NORMAL_REPEAT;
 364         break;
 365
 366     case PIXMAN_REPEAT_PAD:
 367         flags |= FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_NONE_REPEAT | FAST_PATH_NO_NORMAL_REPEAT;
 368         break;
 369
 370     default:
 371         flags |= FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_PAD_REPEAT | FAST_PATH_NO_NONE_REPEAT;
 372         break;
 373     }
 374
 375     /* Component alpha */
 376     if (image->common.component_alpha)
 377         flags |= FAST_PATH_COMPONENT_ALPHA;
 378     else
 379         flags |= FAST_PATH_UNIFIED_ALPHA;
 380
 381     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NO_WIDE_FORMAT);
 382
 383     /* Type specific checks */
 384     switch (image->type)
 385     {
 386     case SOLID:
 387         code = PIXMAN_solid;
 388
 389         if (image->solid.color.alpha == 0xffff)
 390             flags |= FAST_PATH_IS_OPAQUE;
 391         break;
 392
 393     case BITS:
 394         if (image->bits.width == 1      &&
 395             image->bits.height == 1     &&
 396             image->common.repeat != PIXMAN_REPEAT_NONE)
 397         {
 398             code = PIXMAN_solid;
 399         }
 400         else
 401         {
 402             code = image->bits.format;
 403
 404             if (!image->common.transform &&
 405                 image->common.repeat == PIXMAN_REPEAT_NORMAL)
 406             {
 407                 flags |= FAST_PATH_SIMPLE_REPEAT;
 408             }
 409         }
 410
 411         if (image->common.repeat != PIXMAN_REPEAT_NONE                          &&
 412             !PIXMAN_FORMAT_A (image->bits.format)                               &&
 413             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_GRAY         &&
 414             PIXMAN_FORMAT_TYPE (image->bits.format) != PIXMAN_TYPE_COLOR)
 415         {
 416             flags |= FAST_PATH_IS_OPAQUE;
 417         }
 418
 419         if (source_image_needs_out_of_bounds_workaround (&image->bits))
 420             flags |= FAST_PATH_NEEDS_WORKAROUND;
 421
 422         if (image->bits.read_func || image->bits.write_func)
 423             flags &= ~FAST_PATH_NO_ACCESSORS;
 424
 425         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 426             flags &= ~FAST_PATH_NO_WIDE_FORMAT;
 427         break;
 428
 429     case LINEAR:
 430     case RADIAL:
 431         code = PIXMAN_unknown;
 432
 433         if (image->common.repeat != PIXMAN_REPEAT_NONE)
 434         {
 435             int i;
 436
 437             flags |= FAST_PATH_IS_OPAQUE;
 438             for (i = 0; i < image->gradient.n_stops; ++i)
 439             {
 440                 if (image->gradient.stops[i].color.alpha != 0xffff)
 441                 {
 442                     flags &= ~FAST_PATH_IS_OPAQUE;
 443                     break;
 444                 }
 445             }
 446         }
 447         break;
 448
 449     default:
 450         code = PIXMAN_unknown;
 451         break;
 452     }
 453
 454     /* Both alpha maps and convolution filters can introduce
 455      * non-opaqueness in otherwise opaque images. Also
 456      * an image with component alpha turned on is only opaque
 457      * if all channels are opaque, so we simply turn it off
 458      * unconditionally for those images.
 459      */
 460     if (image->common.alpha_map                                 ||
 461         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 462         image->common.component_alpha)
 463     {
 464         flags &= ~FAST_PATH_IS_OPAQUE;
 465     }
 466
 467     image->common.flags = flags;
 468     image->common.extended_format_code = code;
 469 }
 470
 471 void
 472 _pixman_image_validate (pixman_image_t *image)
 473 {
 474     if (image->common.dirty)
 475     {
 476         compute_image_info (image);
 477
 478         /* It is important that property_changed is
 479          * called *after* compute_image_info() because
 480          * property_changed() can make use of the flags
 481          * to set up accessors etc.
 482          */
 483         image->common.property_changed (image);
 484
 485         image->common.dirty = FALSE;
 486     }
 487
 488     if (image->common.alpha_map)
 489         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 490 }
 491
 492 PIXMAN_EXPORT pixman_bool_t
 493 pixman_image_set_clip_region32 (pixman_image_t *   image,
 494                                 pixman_region32_t *region)
 495 {
 496     image_common_t *common = (image_common_t *)image;
 497     pixman_bool_t result;
 498
 499     if (region)
 500     {
 501         if ((result = pixman_region32_copy (&common->clip_region, region)))
 502             image->common.have_clip_region = TRUE;
 503     }
 504     else
 505     {
 506         _pixman_image_reset_clip_region (image);
 507
 508         result = TRUE;
 509     }
 510
 511     image_property_changed (image);
 512
 513     return result;
 514 }
 515
 516 PIXMAN_EXPORT pixman_bool_t
 517 pixman_image_set_clip_region (pixman_image_t *   image,
 518                               pixman_region16_t *region)
 519 {
 520     image_common_t *common = (image_common_t *)image;
 521     pixman_bool_t result;
 522
 523     if (region)
 524     {
 525         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 526             image->common.have_clip_region = TRUE;
 527     }
 528     else
 529     {
 530         _pixman_image_reset_clip_region (image);
 531
 532         result = TRUE;
 533     }
 534
 535     image_property_changed (image);
 536
 537     return result;
 538 }
 539
 540 PIXMAN_EXPORT void
 541 pixman_image_set_has_client_clip (pixman_image_t *image,
 542                                   pixman_bool_t   client_clip)
 543 {
 544     image->common.client_clip = client_clip;
 545 }
 546
 547 PIXMAN_EXPORT pixman_bool_t
 548 pixman_image_set_transform (pixman_image_t *          image,
 549                             const pixman_transform_t *transform)
 550 {
 551     static const pixman_transform_t id =
 552     {
 553         { { pixman_fixed_1, 0, 0 },
 554           { 0, pixman_fixed_1, 0 },
 555           { 0, 0, pixman_fixed_1 } }
 556     };
 557
 558     image_common_t *common = (image_common_t *)image;
 559     pixman_bool_t result;
 560
 561     if (common->transform == transform)
 562         return TRUE;
 563
 564     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 565     {
 566         free (common->transform);
 567         common->transform = NULL;
 568         result = TRUE;
 569
 570         goto out;
 571     }
 572
 573     if (common->transform == NULL)
 574         common->transform = malloc (sizeof (pixman_transform_t));
 575
 576     if (common->transform == NULL)
 577     {
 578         result = FALSE;
 579
 580         goto out;
 581     }
 582
 583     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 584
 585     result = TRUE;
 586
 587 out:
 588     image_property_changed (image);
 589
 590     return result;
 591 }
 592
 593 PIXMAN_EXPORT void
 594 pixman_image_set_repeat (pixman_image_t *image,
 595                          pixman_repeat_t repeat)
 596 {
 597     image->common.repeat = repeat;
 598
 599     image_property_changed (image);
 600 }
 601
 602 PIXMAN_EXPORT pixman_bool_t
 603 pixman_image_set_filter (pixman_image_t *      image,
 604                          pixman_filter_t       filter,
 605                          const pixman_fixed_t *params,
 606                          int                   n_params)
 607 {
 608     image_common_t *common = (image_common_t *)image;
 609     pixman_fixed_t *new_params;
 610
 611     if (params == common->filter_params && filter == common->filter)
 612         return TRUE;
 613
 614     new_params = NULL;
 615     if (params)
 616     {
 617         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 618         if (!new_params)
 619             return FALSE;
 620
 621         memcpy (new_params,
 622                 params, n_params * sizeof (pixman_fixed_t));
 623     }
 624
 625     common->filter = filter;
 626
 627     if (common->filter_params)
 628         free (common->filter_params);
 629
 630     common->filter_params = new_params;
 631     common->n_filter_params = n_params;
 632
 633     image_property_changed (image);
 634     return TRUE;
 635 }
 636
 637 PIXMAN_EXPORT void
 638 pixman_image_set_source_clipping (pixman_image_t *image,
 639                                   pixman_bool_t   clip_sources)
 640 {
 641     image->common.clip_sources = clip_sources;
 642
 643     image_property_changed (image);
 644 }
 645
 646 /* Unlike all the other property setters, this function does not
 647  * copy the content of indexed. Doing this copying is simply
 648  * way, way too expensive.
 649  */
 650 PIXMAN_EXPORT void
 651 pixman_image_set_indexed (pixman_image_t *        image,
 652                           const pixman_indexed_t *indexed)
 653 {
 654     bits_image_t *bits = (bits_image_t *)image;
 655
 656     bits->indexed = indexed;
 657
 658     image_property_changed (image);
 659 }
 660
 661 PIXMAN_EXPORT void
 662 pixman_image_set_alpha_map (pixman_image_t *image,
 663                             pixman_image_t *alpha_map,
 664                             int16_t         x,
 665                             int16_t         y)
 666 {
 667     image_common_t *common = (image_common_t *)image;
 668
 669     return_if_fail (!alpha_map || alpha_map->type == BITS);
 670
 671     if (common->alpha_map != (bits_image_t *)alpha_map)
 672     {
 673         if (common->alpha_map)
 674             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 675
 676         if (alpha_map)
 677             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 678         else
 679             common->alpha_map = NULL;
 680     }
 681
 682     common->alpha_origin_x = x;
 683     common->alpha_origin_y = y;
 684
 685     image_property_changed (image);
 686 }
 687
 688 PIXMAN_EXPORT void
 689 pixman_image_set_component_alpha   (pixman_image_t *image,
 690                                     pixman_bool_t   component_alpha)
 691 {
 692     image->common.component_alpha = component_alpha;
 693
 694     image_property_changed (image);
 695 }
 696
 697 PIXMAN_EXPORT pixman_bool_t
 698 pixman_image_get_component_alpha   (pixman_image_t       *image)
 699 {
 700     return image->common.component_alpha;
 701 }
 702
 703 PIXMAN_EXPORT void
 704 pixman_image_set_accessors (pixman_image_t *           image,
 705                             pixman_read_memory_func_t  read_func,
 706                             pixman_write_memory_func_t write_func)
 707 {
 708     return_if_fail (image != NULL);
 709
 710     if (image->type == BITS)
 711     {
 712         image->bits.read_func = read_func;
 713         image->bits.write_func = write_func;
 714
 715         image_property_changed (image);
 716     }
 717 }
 718
 719 PIXMAN_EXPORT uint32_t *
 720 pixman_image_get_data (pixman_image_t *image)
 721 {
 722     if (image->type == BITS)
 723         return image->bits.bits;
 724
 725     return NULL;
 726 }
 727
 728 PIXMAN_EXPORT int
 729 pixman_image_get_width (pixman_image_t *image)
 730 {
 731     if (image->type == BITS)
 732         return image->bits.width;
 733
 734     return 0;
 735 }
 736
 737 PIXMAN_EXPORT int
 738 pixman_image_get_height (pixman_image_t *image)
 739 {
 740     if (image->type == BITS)
 741         return image->bits.height;
 742
 743     return 0;
 744 }
 745
 746 PIXMAN_EXPORT int
 747 pixman_image_get_stride (pixman_image_t *image)
 748 {
 749     if (image->type == BITS)
 750         return image->bits.rowstride * (int) sizeof (uint32_t);
 751
 752     return 0;
 753 }
 754
 755 PIXMAN_EXPORT int
 756 pixman_image_get_depth (pixman_image_t *image)
 757 {
 758     if (image->type == BITS)
 759         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 760
 761     return 0;
 762 }
 763
 764 PIXMAN_EXPORT pixman_format_code_t
 765 pixman_image_get_format (pixman_image_t *image)
 766 {
 767     if (image->type == BITS)
 768         return image->bits.format;
 769
 770     return 0;
 771 }
 772
 773 uint32_t
 774 _pixman_image_get_solid (pixman_image_t *     image,
 775                          pixman_format_code_t format)
 776 {
 777     uint32_t result;
 778
 779     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL);
 780
 781     /* If necessary, convert RGB <--> BGR. */
 782     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 783     {
 784         result = (((result & 0xff000000) >>  0) |
 785                   ((result & 0x00ff0000) >> 16) |
 786                   ((result & 0x0000ff00) >>  0) |
 787                   ((result & 0x000000ff) << 16));
 788     }
 789
 790     return result;
 791 }