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 static source_pict_class_t
  36 SourcePictureClassify (pixman_image_t *image,
  37                        int             x,
  38                        int             y,
  39                        int             width,
  40                        int             height)
  41 {
  42     source_image_t *pict = &image->source;
  43
  44     pict->class = SOURCE_IMAGE_CLASS_UNKNOWN;
  45
  46     if (pict->common.type == SOLID)
  47     {
  48         pict->class = SOURCE_IMAGE_CLASS_HORIZONTAL;
  49     }
  50     else if (pict->common.type == LINEAR)
  51     {
  52         linear_gradient_t *linear = (linear_gradient_t *)pict;
  53         pixman_vector_t   v;
  54         pixman_fixed_32_32_t l;
  55         pixman_fixed_48_16_t dx, dy, a, b, off;
  56         pixman_fixed_48_16_t factors[4];
  57         int          i;
  58
  59         dx = linear->p2.x - linear->p1.x;
  60         dy = linear->p2.y - linear->p1.y;
  61         l = dx * dx + dy * dy;
  62         if (l)
  63         {
  64             a = (dx << 32) / l;
  65             b = (dy << 32) / l;
  66         }
  67         else
  68         {
  69             a = b = 0;
  70         }
  71
  72         off = (-a * linear->p1.x
  73                -b * linear->p1.y) >> 16;
  74
  75         for (i = 0; i < 3; i++)
  76         {
  77             v.vector[0] = pixman_int_to_fixed ((i % 2) * (width  - 1) + x);
  78             v.vector[1] = pixman_int_to_fixed ((i / 2) * (height - 1) + y);
  79             v.vector[2] = pixman_fixed_1;
  80
  81             if (pict->common.transform)
  82             {
  83                 if (!pixman_transform_point_3d (pict->common.transform, &v))
  84                 {
  85                     pict->class = SOURCE_IMAGE_CLASS_UNKNOWN;
  86                     goto out;
  87                 }
  88             }
  89
  90             factors[i] = ((a * v.vector[0] + b * v.vector[1]) >> 16) + off;
  91         }
  92
  93         if (factors[2] == factors[0])
  94             pict->class = SOURCE_IMAGE_CLASS_HORIZONTAL;
  95         else if (factors[1] == factors[0])
  96             pict->class = SOURCE_IMAGE_CLASS_VERTICAL;
  97     }
  98
  99 out:
 100     return pict->class;
 101 }
 102
 103 static void
 104 init_source_image (source_image_t *image)
 105 {
 106     image->class = SOURCE_IMAGE_CLASS_UNKNOWN;
 107     image->common.classify = SourcePictureClassify;
 108 }
 109
 110 static pixman_bool_t
 111 init_gradient (gradient_t     *gradient,
 112                const pixman_gradient_stop_t *stops,
 113                int             n_stops)
 114 {
 115     return_val_if_fail (n_stops > 0, FALSE);
 116
 117     init_source_image (&gradient->common);
 118
 119     gradient->stops = pixman_malloc_ab (n_stops, sizeof (pixman_gradient_stop_t));
 120     if (!gradient->stops)
 121         return FALSE;
 122
 123     memcpy (gradient->stops, stops, n_stops * sizeof (pixman_gradient_stop_t));
 124
 125     gradient->n_stops = n_stops;
 126
 127     gradient->stop_range = 0xffff;
 128     gradient->color_table = NULL;
 129     gradient->color_table_size = 0;
 130
 131     return TRUE;
 132 }
 133
 134 static uint32_t
 135 color_to_uint32 (const pixman_color_t *color)
 136 {
 137     return
 138         (color->alpha >> 8 << 24) |
 139         (color->red >> 8 << 16) |
 140         (color->green & 0xff00) |
 141         (color->blue >> 8);
 142 }
 143
 144 static pixman_image_t *
 145 allocate_image (void)
 146 {
 147     pixman_image_t *image = malloc (sizeof (pixman_image_t));
 148
 149     if (image)
 150     {
 151         image_common_t *common = &image->common;
 152
 153         pixman_region32_init (&common->full_region);
 154         pixman_region32_init (&common->clip_region);
 155         common->src_clip = &common->full_region;
 156         common->has_client_clip = FALSE;
 157         common->transform = NULL;
 158         common->repeat = PIXMAN_REPEAT_NONE;
 159         common->filter = PIXMAN_FILTER_NEAREST;
 160         common->filter_params = NULL;
 161         common->n_filter_params = 0;
 162         common->alpha_map = NULL;
 163         common->component_alpha = FALSE;
 164         common->ref_count = 1;
 165         common->read_func = NULL;
 166         common->write_func = NULL;
 167         common->classify = NULL;
 168     }
 169
 170     return image;
 171 }
 172
 173 source_pict_class_t
 174 _pixman_image_classify (pixman_image_t *image,
 175                         int             x,
 176                         int             y,
 177                         int             width,
 178                         int             height)
 179 {
 180     if (image->common.classify)
 181         return image->common.classify (image, x, y, width, height);
 182     else
 183         return SOURCE_IMAGE_CLASS_UNKNOWN;
 184 }
 185
 186 #define READ_ACCESS(f) ((image->common.read_func)? f##_accessors : f)
 187
 188 static void fbFetchSolid(bits_image_t * image, int x, int y, int width, uint32_t *buffer, uint32_t *mask, uint32_t maskBits)
 189 {
 190     uint32_t color;
 191     uint32_t *end;
 192     fetchPixelProc32 fetch = READ_ACCESS(pixman_fetchPixelProcForPicture32)(image);
 193
 194     color = fetch(image, 0, 0);
 195
 196     end = buffer + width;
 197     while (buffer < end)
 198         *(buffer++) = color;
 199 }
 200
 201 static void fbFetchSolid64(bits_image_t * image, int x, int y, int width, uint64_t *buffer, void *unused, uint32_t unused2)
 202 {
 203     uint64_t color;
 204     uint64_t *end;
 205     fetchPixelProc64 fetch = READ_ACCESS(pixman_fetchPixelProcForPicture64)(image);
 206
 207     color = fetch(image, 0, 0);
 208
 209     end = buffer + width;
 210     while (buffer < end)
 211         *(buffer++) = color;
 212 }
 213
 214 static void fbFetch(bits_image_t * image, int x, int y, int width, uint32_t *buffer, uint32_t *mask, uint32_t maskBits)
 215 {
 216     fetchProc32 fetch = READ_ACCESS(pixman_fetchProcForPicture32)(image);
 217
 218     fetch(image, x, y, width, buffer);
 219 }
 220
 221 static void fbFetch64(bits_image_t * image, int x, int y, int width, uint64_t *buffer, void *unused, uint32_t unused2)
 222 {
 223     fetchProc64 fetch = READ_ACCESS(pixman_fetchProcForPicture64)(image);
 224
 225     fetch(image, x, y, width, buffer);
 226 }
 227
 228 scanFetchProc
 229 _pixman_image_get_fetcher (pixman_image_t *image,
 230                            int             wide)
 231 {
 232     if (IS_SOURCE_IMAGE (image))
 233     {
 234         if (wide)
 235             return (scanFetchProc)pixmanFetchSourcePict64;
 236         else
 237             return (scanFetchProc)pixmanFetchSourcePict;
 238     }
 239     else
 240     {
 241         bits_image_t *bits = (bits_image_t *)image;
 242
 243         if (bits->common.alpha_map)
 244         {
 245             if (wide)
 246                 return (scanFetchProc)READ_ACCESS(fbFetchExternalAlpha64);
 247             else
 248                 return (scanFetchProc)READ_ACCESS(fbFetchExternalAlpha);
 249         }
 250         else if ((bits->common.repeat != PIXMAN_REPEAT_NONE) &&
 251                  bits->width == 1 &&
 252                  bits->height == 1)
 253         {
 254             if (wide)
 255                 return (scanFetchProc)fbFetchSolid64;
 256             else
 257                 return (scanFetchProc)fbFetchSolid;
 258         }
 259         else if (!bits->common.transform && bits->common.filter != PIXMAN_FILTER_CONVOLUTION
 260                 && bits->common.repeat != PIXMAN_REPEAT_PAD && bits->common.repeat != PIXMAN_REPEAT_REFLECT)
 261         {
 262             if (wide)
 263                 return (scanFetchProc)fbFetch64;
 264             else
 265                 return (scanFetchProc)fbFetch;
 266         }
 267         else
 268         {
 269             if (wide)
 270                 return (scanFetchProc)READ_ACCESS(fbFetchTransformed64);
 271             else
 272                 return (scanFetchProc)READ_ACCESS(fbFetchTransformed);
 273         }
 274     }
 275 }
 276
 277
 278
 279 #define WRITE_ACCESS(f) ((image->common.write_func)? f##_accessors : f)
 280
 281 static void
 282 fbStore(bits_image_t * image, int x, int y, int width, uint32_t *buffer)
 283 {
 284     uint32_t *bits;
 285     int32_t stride;
 286     storeProc32 store = WRITE_ACCESS(pixman_storeProcForPicture32)(image);
 287     const pixman_indexed_t * indexed = image->indexed;
 288
 289     bits = image->bits;
 290     stride = image->rowstride;
 291     bits += y*stride;
 292     store((pixman_image_t *)image, bits, buffer, x, width, indexed);
 293 }
 294
 295 static void
 296 fbStore64(bits_image_t * image, int x, int y, int width, uint64_t *buffer)
 297 {
 298     uint32_t *bits;
 299     int32_t stride;
 300     storeProc64 store = WRITE_ACCESS(pixman_storeProcForPicture64)(image);
 301     const pixman_indexed_t * indexed = image->indexed;
 302
 303     bits = image->bits;
 304     stride = image->rowstride;
 305     bits += y*stride;
 306     store((pixman_image_t *)image, bits, buffer, x, width, indexed);
 307 }
 308
 309 scanStoreProc
 310 _pixman_image_get_storer (pixman_image_t *image,
 311                           int             wide)
 312 {
 313     if (image->common.alpha_map)
 314     {
 315         if (wide)
 316             return (scanStoreProc)WRITE_ACCESS(fbStoreExternalAlpha64);
 317         else
 318             return (scanStoreProc)WRITE_ACCESS(fbStoreExternalAlpha);
 319     }
 320     else
 321     {
 322         if (wide)
 323             return (scanStoreProc)fbStore64;
 324         else
 325             return (scanStoreProc)fbStore;
 326     }
 327 }
 328
 329 /* Ref Counting */
 330 PIXMAN_EXPORT pixman_image_t *
 331 pixman_image_ref (pixman_image_t *image)
 332 {
 333     image->common.ref_count++;
 334
 335     return image;
 336 }
 337
 338 /* returns TRUE when the image is freed */
 339 PIXMAN_EXPORT pixman_bool_t
 340 pixman_image_unref (pixman_image_t *image)
 341 {
 342     image_common_t *common = (image_common_t *)image;
 343
 344     common->ref_count--;
 345
 346     if (common->ref_count == 0)
 347     {
 348         pixman_region32_fini (&common->clip_region);
 349         pixman_region32_fini (&common->full_region);
 350
 351         if (common->transform)
 352             free (common->transform);
 353
 354         if (common->filter_params)
 355             free (common->filter_params);
 356
 357         if (common->alpha_map)
 358             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 359
 360 #if 0
 361         if (image->type == BITS && image->bits.indexed)
 362             free (image->bits.indexed);
 363 #endif
 364
 365 #if 0
 366         memset (image, 0xaa, sizeof (pixman_image_t));
 367 #endif
 368         if (image->type == LINEAR || image->type == RADIAL || image->type == CONICAL)
 369         {
 370             if (image->gradient.stops)
 371                 free (image->gradient.stops);
 372         }
 373
 374
 375         if (image->type == BITS && image->bits.free_me)
 376             free (image->bits.free_me);
 377
 378         free (image);
 379
 380         return TRUE;
 381     }
 382
 383     return FALSE;
 384 }
 385
 386 /* Constructors */
 387 PIXMAN_EXPORT pixman_image_t *
 388 pixman_image_create_solid_fill (pixman_color_t *color)
 389 {
 390     pixman_image_t *img = allocate_image();
 391     if (!img)
 392         return NULL;
 393
 394     init_source_image (&img->solid.common);
 395
 396     img->type = SOLID;
 397     img->solid.color = color_to_uint32 (color);
 398
 399     return img;
 400 }
 401
 402 PIXMAN_EXPORT pixman_image_t *
 403 pixman_image_create_linear_gradient (pixman_point_fixed_t         *p1,
 404                                      pixman_point_fixed_t         *p2,
 405                                      const pixman_gradient_stop_t *stops,
 406                                      int                           n_stops)
 407 {
 408     pixman_image_t *image;
 409     linear_gradient_t *linear;
 410
 411     return_val_if_fail (n_stops >= 2, NULL);
 412
 413     image = allocate_image();
 414
 415     if (!image)
 416         return NULL;
 417
 418     linear = &image->linear;
 419
 420     if (!init_gradient (&linear->common, stops, n_stops))
 421     {
 422         free (image);
 423         return NULL;
 424     }
 425
 426     linear->p1 = *p1;
 427     linear->p2 = *p2;
 428
 429     image->type = LINEAR;
 430
 431     return image;
 432 }
 433
 434
 435 PIXMAN_EXPORT pixman_image_t *
 436 pixman_image_create_radial_gradient (pixman_point_fixed_t         *inner,
 437                                      pixman_point_fixed_t         *outer,
 438                                      pixman_fixed_t                inner_radius,
 439                                      pixman_fixed_t                outer_radius,
 440                                      const pixman_gradient_stop_t *stops,
 441                                      int                           n_stops)
 442 {
 443     pixman_image_t *image;
 444     radial_gradient_t *radial;
 445
 446     return_val_if_fail (n_stops >= 2, NULL);
 447
 448     image = allocate_image();
 449
 450     if (!image)
 451         return NULL;
 452
 453     radial = &image->radial;
 454
 455     if (!init_gradient (&radial->common, stops, n_stops))
 456     {
 457         free (image);
 458         return NULL;
 459     }
 460
 461     image->type = RADIAL;
 462
 463     radial->c1.x = inner->x;
 464     radial->c1.y = inner->y;
 465     radial->c1.radius = inner_radius;
 466     radial->c2.x = outer->x;
 467     radial->c2.y = outer->y;
 468     radial->c2.radius = outer_radius;
 469     radial->cdx = pixman_fixed_to_double (radial->c2.x - radial->c1.x);
 470     radial->cdy = pixman_fixed_to_double (radial->c2.y - radial->c1.y);
 471     radial->dr = pixman_fixed_to_double (radial->c2.radius - radial->c1.radius);
 472     radial->A = (radial->cdx * radial->cdx
 473                  + radial->cdy * radial->cdy
 474                  - radial->dr  * radial->dr);
 475
 476     return image;
 477 }
 478
 479 PIXMAN_EXPORT pixman_image_t *
 480 pixman_image_create_conical_gradient (pixman_point_fixed_t *center,
 481                                       pixman_fixed_t angle,
 482                                       const pixman_gradient_stop_t *stops,
 483                                       int n_stops)
 484 {
 485     pixman_image_t *image = allocate_image();
 486     conical_gradient_t *conical;
 487
 488     if (!image)
 489         return NULL;
 490
 491     conical = &image->conical;
 492
 493     if (!init_gradient (&conical->common, stops, n_stops))
 494     {
 495         free (image);
 496         return NULL;
 497     }
 498
 499     image->type = CONICAL;
 500     conical->center = *center;
 501     conical->angle = angle;
 502
 503     return image;
 504 }
 505
 506 static uint32_t *
 507 create_bits (pixman_format_code_t format,
 508              int                  width,
 509              int                  height,
 510              int                 *rowstride_bytes)
 511 {
 512     int stride;
 513     int buf_size;
 514     int bpp;
 515
 516     /* what follows is a long-winded way, avoiding any possibility of integer
 517      * overflows, of saying:
 518      * stride = ((width * bpp + FB_MASK) >> FB_SHIFT) * sizeof (uint32_t);
 519      */
 520
 521     bpp = PIXMAN_FORMAT_BPP (format);
 522     if (pixman_multiply_overflows_int (width, bpp))
 523         return NULL;
 524
 525     stride = width * bpp;
 526     if (pixman_addition_overflows_int (stride, FB_MASK))
 527         return NULL;
 528
 529     stride += FB_MASK;
 530     stride >>= FB_SHIFT;
 531
 532 #if FB_SHIFT < 2
 533     if (pixman_multiply_overflows_int (stride, sizeof (uint32_t)))
 534         return NULL;
 535 #endif
 536     stride *= sizeof (uint32_t);
 537
 538     if (pixman_multiply_overflows_int (height, stride))
 539         return NULL;
 540
 541     buf_size = height * stride;
 542
 543     if (rowstride_bytes)
 544         *rowstride_bytes = stride;
 545
 546     return calloc (buf_size, 1);
 547 }
 548
 549 static void
 550 reset_clip_region (pixman_image_t *image)
 551 {
 552     pixman_region32_fini (&image->common.clip_region);
 553
 554     if (image->type == BITS)
 555     {
 556         pixman_region32_init_rect (&image->common.clip_region, 0, 0,
 557                                    image->bits.width, image->bits.height);
 558     }
 559     else
 560     {
 561         pixman_region32_init (&image->common.clip_region);
 562     }
 563 }
 564
 565 PIXMAN_EXPORT pixman_image_t *
 566 pixman_image_create_bits (pixman_format_code_t  format,
 567                           int                   width,
 568                           int                   height,
 569                           uint32_t             *bits,
 570                           int                   rowstride_bytes)
 571 {
 572     pixman_image_t *image;
 573     uint32_t *free_me = NULL;
 574
 575     /* must be a whole number of uint32_t's
 576      */
 577     return_val_if_fail (bits == NULL ||
 578                         (rowstride_bytes % sizeof (uint32_t)) == 0, NULL);
 579
 580     if (!bits && width && height)
 581     {
 582         free_me = bits = create_bits (format, width, height, &rowstride_bytes);
 583         if (!bits)
 584             return NULL;
 585     }
 586
 587     image = allocate_image();
 588
 589     if (!image) {
 590         if (free_me)
 591             free (free_me);
 592         return NULL;
 593     }
 594
 595     image->type = BITS;
 596     image->bits.format = format;
 597     image->bits.width = width;
 598     image->bits.height = height;
 599     image->bits.bits = bits;
 600     image->bits.free_me = free_me;
 601
 602     image->bits.rowstride = rowstride_bytes / (int) sizeof (uint32_t); /* we store it in number
 603                                                                   * of uint32_t's
 604                                                                   */
 605     image->bits.indexed = NULL;
 606
 607     pixman_region32_fini (&image->common.full_region);
 608     pixman_region32_init_rect (&image->common.full_region, 0, 0,
 609                                image->bits.width, image->bits.height);
 610
 611     reset_clip_region (image);
 612     return image;
 613 }
 614
 615 PIXMAN_EXPORT pixman_bool_t
 616 pixman_image_set_clip_region32 (pixman_image_t *image,
 617                                 pixman_region32_t *region)
 618 {
 619     image_common_t *common = (image_common_t *)image;
 620
 621     if (region)
 622     {
 623         return pixman_region32_copy (&common->clip_region, region);
 624     }
 625     else
 626     {
 627         reset_clip_region (image);
 628
 629         return TRUE;
 630     }
 631 }
 632
 633
 634 PIXMAN_EXPORT pixman_bool_t
 635 pixman_image_set_clip_region (pixman_image_t    *image,
 636                               pixman_region16_t *region)
 637 {
 638     image_common_t *common = (image_common_t *)image;
 639
 640     if (region)
 641     {
 642         return pixman_region32_copy_from_region16 (&common->clip_region, region);
 643     }
 644     else
 645     {
 646         reset_clip_region (image);
 647
 648         return TRUE;
 649     }
 650 }
 651
 652 /* Sets whether the clip region includes a clip region set by the client
 653  */
 654 PIXMAN_EXPORT void
 655 pixman_image_set_has_client_clip (pixman_image_t *image,
 656                                   pixman_bool_t   client_clip)
 657 {
 658     image->common.has_client_clip = client_clip;
 659 }
 660
 661 PIXMAN_EXPORT pixman_bool_t
 662 pixman_image_set_transform (pixman_image_t           *image,
 663                             const pixman_transform_t *transform)
 664 {
 665     static const pixman_transform_t id =
 666     {
 667         { { pixman_fixed_1, 0, 0 },
 668           { 0, pixman_fixed_1, 0 },
 669           { 0, 0, pixman_fixed_1 }
 670         }
 671     };
 672
 673     image_common_t *common = (image_common_t *)image;
 674
 675     if (common->transform == transform)
 676         return TRUE;
 677
 678     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 679     {
 680         free(common->transform);
 681         common->transform = NULL;
 682         return TRUE;
 683     }
 684
 685     if (common->transform == NULL)
 686         common->transform = malloc (sizeof (pixman_transform_t));
 687     if (common->transform == NULL)
 688         return FALSE;
 689
 690     memcpy(common->transform, transform, sizeof(pixman_transform_t));
 691
 692     return TRUE;
 693 }
 694
 695 PIXMAN_EXPORT void
 696 pixman_image_set_repeat (pixman_image_t  *image,
 697                          pixman_repeat_t  repeat)
 698 {
 699     image->common.repeat = repeat;
 700 }
 701
 702 PIXMAN_EXPORT pixman_bool_t
 703 pixman_image_set_filter (pixman_image_t       *image,
 704                          pixman_filter_t       filter,
 705                          const pixman_fixed_t *params,
 706                          int                   n_params)
 707 {
 708     image_common_t *common = (image_common_t *)image;
 709     pixman_fixed_t *new_params;
 710
 711     if (params == common->filter_params && filter == common->filter)
 712         return TRUE;
 713
 714     new_params = NULL;
 715     if (params)
 716     {
 717         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 718         if (!new_params)
 719             return FALSE;
 720
 721         memcpy (new_params,
 722                 params, n_params * sizeof (pixman_fixed_t));
 723     }
 724
 725     common->filter = filter;
 726
 727     if (common->filter_params)
 728         free (common->filter_params);
 729
 730     common->filter_params = new_params;
 731     common->n_filter_params = n_params;
 732     return TRUE;
 733 }
 734
 735 PIXMAN_EXPORT void
 736 pixman_image_set_source_clipping (pixman_image_t  *image,
 737                                   pixman_bool_t    source_clipping)
 738 {
 739     image_common_t *common = &image->common;
 740
 741     if (source_clipping)
 742         common->src_clip = &common->clip_region;
 743     else
 744         common->src_clip = &common->full_region;
 745 }
 746
 747 /* Unlike all the other property setters, this function does not
 748  * copy the content of indexed. Doing this copying is simply
 749  * way, way too expensive.
 750  */
 751 PIXMAN_EXPORT void
 752 pixman_image_set_indexed (pixman_image_t         *image,
 753                           const pixman_indexed_t *indexed)
 754 {
 755     bits_image_t *bits = (bits_image_t *)image;
 756
 757     bits->indexed = indexed;
 758 }
 759
 760 PIXMAN_EXPORT void
 761 pixman_image_set_alpha_map (pixman_image_t *image,
 762                             pixman_image_t *alpha_map,
 763                             int16_t         x,
 764                             int16_t         y)
 765 {
 766     image_common_t *common = (image_common_t *)image;
 767
 768     return_if_fail (!alpha_map || alpha_map->type == BITS);
 769
 770     if (common->alpha_map != (bits_image_t *)alpha_map)
 771     {
 772         if (common->alpha_map)
 773             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 774
 775         if (alpha_map)
 776             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 777         else
 778             common->alpha_map = NULL;
 779     }
 780
 781     common->alpha_origin.x = x;
 782     common->alpha_origin.y = y;
 783 }
 784
 785 PIXMAN_EXPORT void
 786 pixman_image_set_component_alpha   (pixman_image_t       *image,
 787                                     pixman_bool_t         component_alpha)
 788 {
 789     image->common.component_alpha = component_alpha;
 790 }
 791
 792
 793 PIXMAN_EXPORT void
 794 pixman_image_set_accessors (pixman_image_t             *image,
 795                             pixman_read_memory_func_t   read_func,
 796                             pixman_write_memory_func_t  write_func)
 797 {
 798     return_if_fail (image != NULL);
 799
 800     image->common.read_func = read_func;
 801     image->common.write_func = write_func;
 802 }
 803
 804 PIXMAN_EXPORT uint32_t *
 805 pixman_image_get_data (pixman_image_t *image)
 806 {
 807     if (image->type == BITS)
 808         return image->bits.bits;
 809
 810     return NULL;
 811 }
 812
 813 PIXMAN_EXPORT int
 814 pixman_image_get_width (pixman_image_t *image)
 815 {
 816     if (image->type == BITS)
 817         return image->bits.width;
 818
 819     return 0;
 820 }
 821
 822 PIXMAN_EXPORT int
 823 pixman_image_get_height (pixman_image_t *image)
 824 {
 825     if (image->type == BITS)
 826         return image->bits.height;
 827
 828     return 0;
 829 }
 830
 831 PIXMAN_EXPORT int
 832 pixman_image_get_stride (pixman_image_t *image)
 833 {
 834     if (image->type == BITS)
 835         return image->bits.rowstride * (int) sizeof (uint32_t);
 836
 837     return 0;
 838 }
 839
 840 PIXMAN_EXPORT int
 841 pixman_image_get_depth (pixman_image_t *image)
 842 {
 843     if (image->type == BITS)
 844         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 845
 846     return 0;
 847 }
 848
 849 static pixman_bool_t
 850 color_to_pixel (pixman_color_t *color,
 851                 uint32_t       *pixel,
 852                 pixman_format_code_t format)
 853 {
 854     uint32_t c = color_to_uint32 (color);
 855
 856     if (!(format == PIXMAN_a8r8g8b8     ||
 857           format == PIXMAN_x8r8g8b8     ||
 858           format == PIXMAN_a8b8g8r8     ||
 859           format == PIXMAN_x8b8g8r8     ||
 860           format == PIXMAN_b8g8r8a8     ||
 861           format == PIXMAN_b8g8r8x8     ||
 862           format == PIXMAN_r5g6b5       ||
 863           format == PIXMAN_b5g6r5       ||
 864           format == PIXMAN_a8))
 865     {
 866         return FALSE;
 867     }
 868
 869     if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_ABGR)
 870     {
 871         c = ((c & 0xff000000) >>  0) |
 872             ((c & 0x00ff0000) >> 16) |
 873             ((c & 0x0000ff00) >>  0) |
 874             ((c & 0x000000ff) << 16);
 875     }
 876     if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_BGRA)
 877     {
 878         c = ((c & 0xff000000) >> 24) |
 879             ((c & 0x00ff0000) >>  8) |
 880             ((c & 0x0000ff00) <<  8) |
 881             ((c & 0x000000ff) << 24);
 882     }
 883
 884     if (format == PIXMAN_a8)
 885         c = c >> 24;
 886     else if (format == PIXMAN_r5g6b5 ||
 887              format == PIXMAN_b5g6r5)
 888         c = cvt8888to0565 (c);
 889
 890 #if 0
 891     printf ("color: %x %x %x %x\n", color->alpha, color->red, color->green, color->blue);
 892     printf ("pixel: %x\n", c);
 893 #endif
 894
 895     *pixel = c;
 896     return TRUE;
 897 }
 898
 899 PIXMAN_EXPORT pixman_bool_t
 900 pixman_image_fill_rectangles (pixman_op_t                   op,
 901                               pixman_image_t               *dest,
 902                               pixman_color_t               *color,
 903                               int                           n_rects,
 904                               const pixman_rectangle16_t   *rects)
 905 {
 906     pixman_image_t *solid;
 907     pixman_color_t c;
 908     int i;
 909
 910     if (color->alpha == 0xffff)
 911     {
 912         if (op == PIXMAN_OP_OVER)
 913             op = PIXMAN_OP_SRC;
 914     }
 915
 916     if (op == PIXMAN_OP_CLEAR)
 917     {
 918         c.red = 0;
 919         c.green = 0;
 920         c.blue = 0;
 921         c.alpha = 0;
 922
 923         color = &c;
 924
 925         op = PIXMAN_OP_SRC;
 926     }
 927
 928     if (op == PIXMAN_OP_SRC)
 929     {
 930         uint32_t pixel;
 931
 932         if (color_to_pixel (color, &pixel, dest->bits.format))
 933         {
 934             for (i = 0; i < n_rects; ++i)
 935             {
 936                 pixman_region32_t fill_region;
 937                 int n_boxes, j;
 938                 pixman_box32_t *boxes;
 939
 940                 pixman_region32_init_rect (&fill_region, rects[i].x, rects[i].y, rects[i].width, rects[i].height);
 941                 if (!pixman_region32_intersect (&fill_region,
 942                                                 &fill_region,
 943                                                 &dest->common.clip_region))
 944                     return FALSE;
 945
 946
 947                 boxes = pixman_region32_rectangles (&fill_region, &n_boxes);
 948                 for (j = 0; j < n_boxes; ++j)
 949                 {
 950                     const pixman_box32_t *box = &(boxes[j]);
 951                     pixman_fill (dest->bits.bits, dest->bits.rowstride, PIXMAN_FORMAT_BPP (dest->bits.format),
 952                                  box->x1, box->y1, box->x2 - box->x1, box->y2 - box->y1,
 953                                  pixel);
 954                 }
 955
 956                 pixman_region32_fini (&fill_region);
 957             }
 958             return TRUE;
 959         }
 960     }
 961
 962     solid = pixman_image_create_solid_fill (color);
 963     if (!solid)
 964         return FALSE;
 965
 966     for (i = 0; i < n_rects; ++i)
 967     {
 968         const pixman_rectangle16_t *rect = &(rects[i]);
 969
 970         pixman_image_composite (op, solid, NULL, dest,
 971                                 0, 0, 0, 0,
 972                                 rect->x, rect->y,
 973                                 rect->width, rect->height);
 974     }
 975
 976     pixman_image_unref (solid);
 977
 978     return TRUE;
 979 }
 980
 981 pixman_bool_t
 982 pixman_image_can_get_solid (pixman_image_t *image)
 983 {
 984     if (image->type == SOLID)
 985         return TRUE;
 986
 987     if (image->type != BITS     ||
 988         image->bits.width != 1  ||
 989         image->bits.height != 1)
 990     {
 991         return FALSE;
 992     }
 993
 994     if (image->common.repeat != PIXMAN_REPEAT_NORMAL)
 995         return FALSE;
 996
 997     switch (image->bits.format)
 998     {
 999     case PIXMAN_a8r8g8b8:
1000     case PIXMAN_x8r8g8b8:
1001     case PIXMAN_a8b8g8r8:
1002     case PIXMAN_x8b8g8r8:
1003     case PIXMAN_b8g8r8a8:
1004     case PIXMAN_b8g8r8x8:
1005     case PIXMAN_r8g8b8:
1006     case PIXMAN_b8g8r8:
1007     case PIXMAN_r5g6b5:
1008     case PIXMAN_b5g6r5:
1009         return TRUE;
1010     default:
1011         return FALSE;
1012     }
1013 }
1014
1015 pixman_bool_t
1016 pixman_image_is_opaque(pixman_image_t *image)
1017 {
1018     int i = 0;
1019     int gradientNumberOfColors = 0;
1020
1021     if(image->common.alpha_map)
1022         return FALSE;
1023
1024     switch(image->type)
1025     {
1026     case BITS:
1027         if(PIXMAN_FORMAT_A(image->bits.format))
1028             return FALSE;
1029         break;
1030
1031     case LINEAR:
1032     case CONICAL:
1033     case RADIAL:
1034         gradientNumberOfColors = image->gradient.n_stops;
1035         i=0;
1036         while(i<gradientNumberOfColors)
1037         {
1038             if(image->gradient.stops[i].color.alpha != 0xffff)
1039                 return FALSE;
1040             i++;
1041         }
1042         break;
1043
1044     case SOLID:
1045          if(Alpha(image->solid.color) != 0xff)
1046             return FALSE;
1047         break;
1048     }
1049
1050     /* Convolution filters can introduce translucency if the sum of the weights
1051        is lower than 1. */
1052     if (image->common.filter == PIXMAN_FILTER_CONVOLUTION)
1053          return FALSE;
1054
1055     if (image->common.repeat == PIXMAN_REPEAT_NONE)
1056     {
1057         if (image->common.filter != PIXMAN_FILTER_NEAREST)
1058             return FALSE;
1059
1060         if (image->common.transform)
1061             return FALSE;
1062
1063         /* Gradients do not necessarily cover the entire compositing area */
1064         if (image->type == LINEAR || image->type == CONICAL || image->type == RADIAL)
1065             return FALSE;
1066     }
1067
1068      return TRUE;
1069 }