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
  31 #include "pixman-private.h"
  32
  33 #define Alpha(x) ((x) >> 24)
  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->color_table = NULL;
  52     gradient->color_table_size = 0;
  53     gradient->common.class = SOURCE_IMAGE_CLASS_UNKNOWN;
  54
  55     return TRUE;
  56 }
  57
  58 pixman_image_t *
  59 _pixman_image_allocate (void)
  60 {
  61     pixman_image_t *image = malloc (sizeof (pixman_image_t));
  62
  63     if (image)
  64     {
  65         image_common_t *common = &image->common;
  66
  67         pixman_region32_init (&common->full_region);
  68         pixman_region32_init (&common->clip_region);
  69         common->src_clip = &common->full_region;
  70         common->has_client_clip = FALSE;
  71         common->transform = NULL;
  72         common->repeat = PIXMAN_REPEAT_NONE;
  73         common->filter = PIXMAN_FILTER_NEAREST;
  74         common->filter_params = NULL;
  75         common->n_filter_params = 0;
  76         common->alpha_map = NULL;
  77         common->component_alpha = FALSE;
  78         common->ref_count = 1;
  79         common->read_func = NULL;
  80         common->write_func = NULL;
  81         common->classify = NULL;
  82     }
  83
  84     return image;
  85 }
  86
  87 source_pict_class_t
  88 _pixman_image_classify (pixman_image_t *image,
  89                         int             x,
  90                         int             y,
  91                         int             width,
  92                         int             height)
  93 {
  94     if (image->common.classify)
  95         return image->common.classify (image, x, y, width, height);
  96     else
  97         return SOURCE_IMAGE_CLASS_UNKNOWN;
  98 }
  99
 100 #define READ_ACCESS(f) ((image->common.read_func)? f##_accessors : f)
 101
 102 static void fbFetchSolid(bits_image_t * image, int x, int y, int width, uint32_t *buffer, uint32_t *mask, uint32_t maskBits)
 103 {
 104     uint32_t color;
 105     uint32_t *end;
 106     fetchPixelProc32 fetch = READ_ACCESS(pixman_fetchPixelProcForPicture32)(image);
 107
 108     color = fetch(image, 0, 0);
 109
 110     end = buffer + width;
 111     while (buffer < end)
 112         *(buffer++) = color;
 113 }
 114
 115 static void fbFetchSolid64(bits_image_t * image, int x, int y, int width, uint64_t *buffer, void *unused, uint32_t unused2)
 116 {
 117     uint64_t color;
 118     uint64_t *end;
 119     fetchPixelProc64 fetch = READ_ACCESS(pixman_fetchPixelProcForPicture64)(image);
 120
 121     color = fetch(image, 0, 0);
 122
 123     end = buffer + width;
 124     while (buffer < end)
 125         *(buffer++) = color;
 126 }
 127
 128 static void fbFetch(bits_image_t * image, int x, int y, int width, uint32_t *buffer, uint32_t *mask, uint32_t maskBits)
 129 {
 130     fetchProc32 fetch = READ_ACCESS(pixman_fetchProcForPicture32)(image);
 131
 132     fetch(image, x, y, width, buffer);
 133 }
 134
 135 static void fbFetch64(bits_image_t * image, int x, int y, int width, uint64_t *buffer, void *unused, uint32_t unused2)
 136 {
 137     fetchProc64 fetch = READ_ACCESS(pixman_fetchProcForPicture64)(image);
 138
 139     fetch(image, x, y, width, buffer);
 140 }
 141
 142 scanFetchProc
 143 _pixman_image_get_fetcher (pixman_image_t *image,
 144                            int             wide)
 145 {
 146     if (IS_SOURCE_IMAGE (image))
 147     {
 148         if (wide)
 149             return (scanFetchProc)pixmanFetchSourcePict64;
 150         else
 151             return (scanFetchProc)pixmanFetchSourcePict;
 152     }
 153     else
 154     {
 155         bits_image_t *bits = (bits_image_t *)image;
 156
 157         if (bits->common.alpha_map)
 158         {
 159             if (wide)
 160                 return (scanFetchProc)READ_ACCESS(fbFetchExternalAlpha64);
 161             else
 162                 return (scanFetchProc)READ_ACCESS(fbFetchExternalAlpha);
 163         }
 164         else if ((bits->common.repeat != PIXMAN_REPEAT_NONE) &&
 165                  bits->width == 1 &&
 166                  bits->height == 1)
 167         {
 168             if (wide)
 169                 return (scanFetchProc)fbFetchSolid64;
 170             else
 171                 return (scanFetchProc)fbFetchSolid;
 172         }
 173         else if (!bits->common.transform && bits->common.filter != PIXMAN_FILTER_CONVOLUTION
 174                 && bits->common.repeat != PIXMAN_REPEAT_PAD && bits->common.repeat != PIXMAN_REPEAT_REFLECT)
 175         {
 176             if (wide)
 177                 return (scanFetchProc)fbFetch64;
 178             else
 179                 return (scanFetchProc)fbFetch;
 180         }
 181         else
 182         {
 183             if (wide)
 184                 return (scanFetchProc)READ_ACCESS(fbFetchTransformed64);
 185             else
 186                 return (scanFetchProc)READ_ACCESS(fbFetchTransformed);
 187         }
 188     }
 189 }
 190
 191
 192
 193 #define WRITE_ACCESS(f) ((image->common.write_func)? f##_accessors : f)
 194
 195 static void
 196 fbStore(bits_image_t * image, int x, int y, int width, uint32_t *buffer)
 197 {
 198     uint32_t *bits;
 199     int32_t stride;
 200     storeProc32 store = WRITE_ACCESS(pixman_storeProcForPicture32)(image);
 201     const pixman_indexed_t * indexed = image->indexed;
 202
 203     bits = image->bits;
 204     stride = image->rowstride;
 205     bits += y*stride;
 206     store((pixman_image_t *)image, bits, buffer, x, width, indexed);
 207 }
 208
 209 static void
 210 fbStore64(bits_image_t * image, int x, int y, int width, uint64_t *buffer)
 211 {
 212     uint32_t *bits;
 213     int32_t stride;
 214     storeProc64 store = WRITE_ACCESS(pixman_storeProcForPicture64)(image);
 215     const pixman_indexed_t * indexed = image->indexed;
 216
 217     bits = image->bits;
 218     stride = image->rowstride;
 219     bits += y*stride;
 220     store((pixman_image_t *)image, bits, buffer, x, width, indexed);
 221 }
 222
 223 scanStoreProc
 224 _pixman_image_get_storer (pixman_image_t *image,
 225                           int             wide)
 226 {
 227     if (image->common.alpha_map)
 228     {
 229         if (wide)
 230             return (scanStoreProc)WRITE_ACCESS(fbStoreExternalAlpha64);
 231         else
 232             return (scanStoreProc)WRITE_ACCESS(fbStoreExternalAlpha);
 233     }
 234     else
 235     {
 236         if (wide)
 237             return (scanStoreProc)fbStore64;
 238         else
 239             return (scanStoreProc)fbStore;
 240     }
 241 }
 242
 243 /* Ref Counting */
 244 PIXMAN_EXPORT pixman_image_t *
 245 pixman_image_ref (pixman_image_t *image)
 246 {
 247     image->common.ref_count++;
 248
 249     return image;
 250 }
 251
 252 /* returns TRUE when the image is freed */
 253 PIXMAN_EXPORT pixman_bool_t
 254 pixman_image_unref (pixman_image_t *image)
 255 {
 256     image_common_t *common = (image_common_t *)image;
 257
 258     common->ref_count--;
 259
 260     if (common->ref_count == 0)
 261     {
 262         pixman_region32_fini (&common->clip_region);
 263         pixman_region32_fini (&common->full_region);
 264
 265         if (common->transform)
 266             free (common->transform);
 267
 268         if (common->filter_params)
 269             free (common->filter_params);
 270
 271         if (common->alpha_map)
 272             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 273
 274 #if 0
 275         if (image->type == BITS && image->bits.indexed)
 276             free (image->bits.indexed);
 277 #endif
 278
 279 #if 0
 280         memset (image, 0xaa, sizeof (pixman_image_t));
 281 #endif
 282         if (image->type == LINEAR || image->type == RADIAL || image->type == CONICAL)
 283         {
 284             if (image->gradient.stops)
 285                 free (image->gradient.stops);
 286         }
 287
 288
 289         if (image->type == BITS && image->bits.free_me)
 290             free (image->bits.free_me);
 291
 292         free (image);
 293
 294         return TRUE;
 295     }
 296
 297     return FALSE;
 298 }
 299
 300 /* Constructors */
 301
 302 void
 303 _pixman_image_reset_clip_region (pixman_image_t *image)
 304 {
 305     pixman_region32_fini (&image->common.clip_region);
 306
 307     if (image->type == BITS)
 308     {
 309         pixman_region32_init_rect (&image->common.clip_region, 0, 0,
 310                                    image->bits.width, image->bits.height);
 311     }
 312     else
 313     {
 314         pixman_region32_init (&image->common.clip_region);
 315     }
 316 }
 317
 318 PIXMAN_EXPORT pixman_bool_t
 319 pixman_image_set_clip_region32 (pixman_image_t *image,
 320                                 pixman_region32_t *region)
 321 {
 322     image_common_t *common = (image_common_t *)image;
 323
 324     if (region)
 325     {
 326         return pixman_region32_copy (&common->clip_region, region);
 327     }
 328     else
 329     {
 330         _pixman_image_reset_clip_region (image);
 331
 332         return TRUE;
 333     }
 334 }
 335
 336
 337 PIXMAN_EXPORT pixman_bool_t
 338 pixman_image_set_clip_region (pixman_image_t    *image,
 339                               pixman_region16_t *region)
 340 {
 341     image_common_t *common = (image_common_t *)image;
 342
 343     if (region)
 344     {
 345         return pixman_region32_copy_from_region16 (&common->clip_region, region);
 346     }
 347     else
 348     {
 349         _pixman_image_reset_clip_region (image);
 350
 351         return TRUE;
 352     }
 353 }
 354
 355 /* Sets whether the clip region includes a clip region set by the client
 356  */
 357 PIXMAN_EXPORT void
 358 pixman_image_set_has_client_clip (pixman_image_t *image,
 359                                   pixman_bool_t   client_clip)
 360 {
 361     image->common.has_client_clip = client_clip;
 362 }
 363
 364 PIXMAN_EXPORT pixman_bool_t
 365 pixman_image_set_transform (pixman_image_t           *image,
 366                             const pixman_transform_t *transform)
 367 {
 368     static const pixman_transform_t id =
 369     {
 370         { { pixman_fixed_1, 0, 0 },
 371           { 0, pixman_fixed_1, 0 },
 372           { 0, 0, pixman_fixed_1 }
 373         }
 374     };
 375
 376     image_common_t *common = (image_common_t *)image;
 377
 378     if (common->transform == transform)
 379         return TRUE;
 380
 381     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 382     {
 383         free(common->transform);
 384         common->transform = NULL;
 385         return TRUE;
 386     }
 387
 388     if (common->transform == NULL)
 389         common->transform = malloc (sizeof (pixman_transform_t));
 390     if (common->transform == NULL)
 391         return FALSE;
 392
 393     memcpy(common->transform, transform, sizeof(pixman_transform_t));
 394
 395     return TRUE;
 396 }
 397
 398 PIXMAN_EXPORT void
 399 pixman_image_set_repeat (pixman_image_t  *image,
 400                          pixman_repeat_t  repeat)
 401 {
 402     image->common.repeat = repeat;
 403 }
 404
 405 PIXMAN_EXPORT pixman_bool_t
 406 pixman_image_set_filter (pixman_image_t       *image,
 407                          pixman_filter_t       filter,
 408                          const pixman_fixed_t *params,
 409                          int                   n_params)
 410 {
 411     image_common_t *common = (image_common_t *)image;
 412     pixman_fixed_t *new_params;
 413
 414     if (params == common->filter_params && filter == common->filter)
 415         return TRUE;
 416
 417     new_params = NULL;
 418     if (params)
 419     {
 420         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 421         if (!new_params)
 422             return FALSE;
 423
 424         memcpy (new_params,
 425                 params, n_params * sizeof (pixman_fixed_t));
 426     }
 427
 428     common->filter = filter;
 429
 430     if (common->filter_params)
 431         free (common->filter_params);
 432
 433     common->filter_params = new_params;
 434     common->n_filter_params = n_params;
 435     return TRUE;
 436 }
 437
 438 PIXMAN_EXPORT void
 439 pixman_image_set_source_clipping (pixman_image_t  *image,
 440                                   pixman_bool_t    source_clipping)
 441 {
 442     image_common_t *common = &image->common;
 443
 444     if (source_clipping)
 445         common->src_clip = &common->clip_region;
 446     else
 447         common->src_clip = &common->full_region;
 448 }
 449
 450 /* Unlike all the other property setters, this function does not
 451  * copy the content of indexed. Doing this copying is simply
 452  * way, way too expensive.
 453  */
 454 PIXMAN_EXPORT void
 455 pixman_image_set_indexed (pixman_image_t         *image,
 456                           const pixman_indexed_t *indexed)
 457 {
 458     bits_image_t *bits = (bits_image_t *)image;
 459
 460     bits->indexed = indexed;
 461 }
 462
 463 PIXMAN_EXPORT void
 464 pixman_image_set_alpha_map (pixman_image_t *image,
 465                             pixman_image_t *alpha_map,
 466                             int16_t         x,
 467                             int16_t         y)
 468 {
 469     image_common_t *common = (image_common_t *)image;
 470
 471     return_if_fail (!alpha_map || alpha_map->type == BITS);
 472
 473     if (common->alpha_map != (bits_image_t *)alpha_map)
 474     {
 475         if (common->alpha_map)
 476             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 477
 478         if (alpha_map)
 479             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 480         else
 481             common->alpha_map = NULL;
 482     }
 483
 484     common->alpha_origin.x = x;
 485     common->alpha_origin.y = y;
 486 }
 487
 488 PIXMAN_EXPORT void
 489 pixman_image_set_component_alpha   (pixman_image_t       *image,
 490                                     pixman_bool_t         component_alpha)
 491 {
 492     image->common.component_alpha = component_alpha;
 493 }
 494
 495
 496 PIXMAN_EXPORT void
 497 pixman_image_set_accessors (pixman_image_t             *image,
 498                             pixman_read_memory_func_t   read_func,
 499                             pixman_write_memory_func_t  write_func)
 500 {
 501     return_if_fail (image != NULL);
 502
 503     image->common.read_func = read_func;
 504     image->common.write_func = write_func;
 505 }
 506
 507 PIXMAN_EXPORT uint32_t *
 508 pixman_image_get_data (pixman_image_t *image)
 509 {
 510     if (image->type == BITS)
 511         return image->bits.bits;
 512
 513     return NULL;
 514 }
 515
 516 PIXMAN_EXPORT int
 517 pixman_image_get_width (pixman_image_t *image)
 518 {
 519     if (image->type == BITS)
 520         return image->bits.width;
 521
 522     return 0;
 523 }
 524
 525 PIXMAN_EXPORT int
 526 pixman_image_get_height (pixman_image_t *image)
 527 {
 528     if (image->type == BITS)
 529         return image->bits.height;
 530
 531     return 0;
 532 }
 533
 534 PIXMAN_EXPORT int
 535 pixman_image_get_stride (pixman_image_t *image)
 536 {
 537     if (image->type == BITS)
 538         return image->bits.rowstride * (int) sizeof (uint32_t);
 539
 540     return 0;
 541 }
 542
 543 PIXMAN_EXPORT int
 544 pixman_image_get_depth (pixman_image_t *image)
 545 {
 546     if (image->type == BITS)
 547         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 548
 549     return 0;
 550 }
 551
 552 static uint32_t
 553 color_to_uint32 (const pixman_color_t *color)
 554 {
 555     return
 556         (color->alpha >> 8 << 24) |
 557         (color->red >> 8 << 16) |
 558         (color->green & 0xff00) |
 559         (color->blue >> 8);
 560 }
 561
 562 static pixman_bool_t
 563 color_to_pixel (pixman_color_t *color,
 564                 uint32_t       *pixel,
 565                 pixman_format_code_t format)
 566 {
 567     uint32_t c = color_to_uint32 (color);
 568
 569     if (!(format == PIXMAN_a8r8g8b8     ||
 570           format == PIXMAN_x8r8g8b8     ||
 571           format == PIXMAN_a8b8g8r8     ||
 572           format == PIXMAN_x8b8g8r8     ||
 573           format == PIXMAN_b8g8r8a8     ||
 574           format == PIXMAN_b8g8r8x8     ||
 575           format == PIXMAN_r5g6b5       ||
 576           format == PIXMAN_b5g6r5       ||
 577           format == PIXMAN_a8))
 578     {
 579         return FALSE;
 580     }
 581
 582     if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_ABGR)
 583     {
 584         c = ((c & 0xff000000) >>  0) |
 585             ((c & 0x00ff0000) >> 16) |
 586             ((c & 0x0000ff00) >>  0) |
 587             ((c & 0x000000ff) << 16);
 588     }
 589     if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_BGRA)
 590     {
 591         c = ((c & 0xff000000) >> 24) |
 592             ((c & 0x00ff0000) >>  8) |
 593             ((c & 0x0000ff00) <<  8) |
 594             ((c & 0x000000ff) << 24);
 595     }
 596
 597     if (format == PIXMAN_a8)
 598         c = c >> 24;
 599     else if (format == PIXMAN_r5g6b5 ||
 600              format == PIXMAN_b5g6r5)
 601         c = cvt8888to0565 (c);
 602
 603 #if 0
 604     printf ("color: %x %x %x %x\n", color->alpha, color->red, color->green, color->blue);
 605     printf ("pixel: %x\n", c);
 606 #endif
 607
 608     *pixel = c;
 609     return TRUE;
 610 }
 611
 612 PIXMAN_EXPORT pixman_bool_t
 613 pixman_image_fill_rectangles (pixman_op_t                   op,
 614                               pixman_image_t               *dest,
 615                               pixman_color_t               *color,
 616                               int                           n_rects,
 617                               const pixman_rectangle16_t   *rects)
 618 {
 619     pixman_image_t *solid;
 620     pixman_color_t c;
 621     int i;
 622
 623     if (color->alpha == 0xffff)
 624     {
 625         if (op == PIXMAN_OP_OVER)
 626             op = PIXMAN_OP_SRC;
 627     }
 628
 629     if (op == PIXMAN_OP_CLEAR)
 630     {
 631         c.red = 0;
 632         c.green = 0;
 633         c.blue = 0;
 634         c.alpha = 0;
 635
 636         color = &c;
 637
 638         op = PIXMAN_OP_SRC;
 639     }
 640
 641     if (op == PIXMAN_OP_SRC)
 642     {
 643         uint32_t pixel;
 644
 645         if (color_to_pixel (color, &pixel, dest->bits.format))
 646         {
 647             for (i = 0; i < n_rects; ++i)
 648             {
 649                 pixman_region32_t fill_region;
 650                 int n_boxes, j;
 651                 pixman_box32_t *boxes;
 652
 653                 pixman_region32_init_rect (&fill_region, rects[i].x, rects[i].y, rects[i].width, rects[i].height);
 654                 if (!pixman_region32_intersect (&fill_region,
 655                                                 &fill_region,
 656                                                 &dest->common.clip_region))
 657                     return FALSE;
 658
 659
 660                 boxes = pixman_region32_rectangles (&fill_region, &n_boxes);
 661                 for (j = 0; j < n_boxes; ++j)
 662                 {
 663                     const pixman_box32_t *box = &(boxes[j]);
 664                     pixman_fill (dest->bits.bits, dest->bits.rowstride, PIXMAN_FORMAT_BPP (dest->bits.format),
 665                                  box->x1, box->y1, box->x2 - box->x1, box->y2 - box->y1,
 666                                  pixel);
 667                 }
 668
 669                 pixman_region32_fini (&fill_region);
 670             }
 671             return TRUE;
 672         }
 673     }
 674
 675     solid = pixman_image_create_solid_fill (color);
 676     if (!solid)
 677         return FALSE;
 678
 679     for (i = 0; i < n_rects; ++i)
 680     {
 681         const pixman_rectangle16_t *rect = &(rects[i]);
 682
 683         pixman_image_composite (op, solid, NULL, dest,
 684                                 0, 0, 0, 0,
 685                                 rect->x, rect->y,
 686                                 rect->width, rect->height);
 687     }
 688
 689     pixman_image_unref (solid);
 690
 691     return TRUE;
 692 }
 693
 694 pixman_bool_t
 695 pixman_image_can_get_solid (pixman_image_t *image)
 696 {
 697     if (image->type == SOLID)
 698         return TRUE;
 699
 700     if (image->type != BITS     ||
 701         image->bits.width != 1  ||
 702         image->bits.height != 1)
 703     {
 704         return FALSE;
 705     }
 706
 707     if (image->common.repeat != PIXMAN_REPEAT_NORMAL)
 708         return FALSE;
 709
 710     switch (image->bits.format)
 711     {
 712     case PIXMAN_a8r8g8b8:
 713     case PIXMAN_x8r8g8b8:
 714     case PIXMAN_a8b8g8r8:
 715     case PIXMAN_x8b8g8r8:
 716     case PIXMAN_b8g8r8a8:
 717     case PIXMAN_b8g8r8x8:
 718     case PIXMAN_r8g8b8:
 719     case PIXMAN_b8g8r8:
 720     case PIXMAN_r5g6b5:
 721     case PIXMAN_b5g6r5:
 722         return TRUE;
 723     default:
 724         return FALSE;
 725     }
 726 }
 727
 728 pixman_bool_t
 729 pixman_image_is_opaque(pixman_image_t *image)
 730 {
 731     int i = 0;
 732     int gradientNumberOfColors = 0;
 733
 734     if(image->common.alpha_map)
 735         return FALSE;
 736
 737     switch(image->type)
 738     {
 739     case BITS:
 740         if(PIXMAN_FORMAT_A(image->bits.format))
 741             return FALSE;
 742         break;
 743
 744     case LINEAR:
 745     case CONICAL:
 746     case RADIAL:
 747         gradientNumberOfColors = image->gradient.n_stops;
 748         i=0;
 749         while(i<gradientNumberOfColors)
 750         {
 751             if(image->gradient.stops[i].color.alpha != 0xffff)
 752                 return FALSE;
 753             i++;
 754         }
 755         break;
 756
 757     case SOLID:
 758          if(Alpha(image->solid.color) != 0xff)
 759             return FALSE;
 760         break;
 761     }
 762
 763     /* Convolution filters can introduce translucency if the sum of the weights
 764        is lower than 1. */
 765     if (image->common.filter == PIXMAN_FILTER_CONVOLUTION)
 766          return FALSE;
 767
 768     if (image->common.repeat == PIXMAN_REPEAT_NONE)
 769     {
 770         if (image->common.filter != PIXMAN_FILTER_NEAREST)
 771             return FALSE;
 772
 773         if (image->common.transform)
 774             return FALSE;
 775
 776         /* Gradients do not necessarily cover the entire compositing area */
 777         if (image->type == LINEAR || image->type == CONICAL || image->type == RADIAL)
 778             return FALSE;
 779     }
 780
 781      return TRUE;
 782 }