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                                        uint32_t         mask_bits)
  70 {
  71     uint32_t *mask8 = NULL;
  72
  73     /* Contract the mask image, if one exists, so that the 32-bit fetch
  74      * function can use it.
  75      */
  76     if (mask)
  77     {
  78         mask8 = pixman_malloc_ab (width, sizeof(uint32_t));
  79         if (!mask8)
  80             return;
  81
  82         pixman_contract (mask8, (uint64_t *)mask, width);
  83     }
  84
  85     /* Fetch the source image into the first half of buffer. */
  86     _pixman_image_get_scanline_32 (image, x, y, width, (uint32_t*)buffer, mask8,
  87                                    mask_bits);
  88
  89     /* Expand from 32bpp to 64bpp in place. */
  90     pixman_expand ((uint64_t *)buffer, buffer, PIXMAN_a8r8g8b8, width);
  91
  92     free (mask8);
  93 }
  94
  95 pixman_image_t *
  96 _pixman_image_allocate (void)
  97 {
  98     pixman_image_t *image = malloc (sizeof (pixman_image_t));
  99
 100     if (image)
 101     {
 102         image_common_t *common = &image->common;
 103
 104         pixman_region32_init (&common->clip_region);
 105
 106         common->have_clip_region = FALSE;
 107         common->clip_sources = FALSE;
 108         common->transform = NULL;
 109         common->repeat = PIXMAN_REPEAT_NONE;
 110         common->filter = PIXMAN_FILTER_NEAREST;
 111         common->filter_params = NULL;
 112         common->n_filter_params = 0;
 113         common->alpha_map = NULL;
 114         common->component_alpha = FALSE;
 115         common->ref_count = 1;
 116         common->classify = NULL;
 117         common->client_clip = FALSE;
 118         common->destroy_func = NULL;
 119         common->destroy_data = NULL;
 120         common->dirty = TRUE;
 121     }
 122
 123     return image;
 124 }
 125
 126 source_image_class_t
 127 _pixman_image_classify (pixman_image_t *image,
 128                         int             x,
 129                         int             y,
 130                         int             width,
 131                         int             height)
 132 {
 133     if (image->common.classify)
 134         return image->common.classify (image, x, y, width, height);
 135     else
 136         return SOURCE_IMAGE_CLASS_UNKNOWN;
 137 }
 138
 139 void
 140 _pixman_image_get_scanline_32 (pixman_image_t *image,
 141                                int             x,
 142                                int             y,
 143                                int             width,
 144                                uint32_t *      buffer,
 145                                const uint32_t *mask,
 146                                uint32_t        mask_bits)
 147 {
 148     image->common.get_scanline_32 (image, x, y, width, buffer, mask, mask_bits);
 149 }
 150
 151 /* Even thought the type of buffer is uint32_t *, the function actually expects
 152  * a uint64_t *buffer.
 153  */
 154 void
 155 _pixman_image_get_scanline_64 (pixman_image_t *image,
 156                                int             x,
 157                                int             y,
 158                                int             width,
 159                                uint32_t *      buffer,
 160                                const uint32_t *unused,
 161                                uint32_t        unused2)
 162 {
 163     image->common.get_scanline_64 (image, x, y, width, buffer, unused, unused2);
 164 }
 165
 166 static void
 167 image_property_changed (pixman_image_t *image)
 168 {
 169     image->common.dirty = TRUE;
 170 }
 171
 172 /* Ref Counting */
 173 PIXMAN_EXPORT pixman_image_t *
 174 pixman_image_ref (pixman_image_t *image)
 175 {
 176     image->common.ref_count++;
 177
 178     return image;
 179 }
 180
 181 /* returns TRUE when the image is freed */
 182 PIXMAN_EXPORT pixman_bool_t
 183 pixman_image_unref (pixman_image_t *image)
 184 {
 185     image_common_t *common = (image_common_t *)image;
 186
 187     common->ref_count--;
 188
 189     if (common->ref_count == 0)
 190     {
 191         if (image->common.destroy_func)
 192             image->common.destroy_func (image, image->common.destroy_data);
 193
 194         pixman_region32_fini (&common->clip_region);
 195
 196         if (common->transform)
 197             free (common->transform);
 198
 199         if (common->filter_params)
 200             free (common->filter_params);
 201
 202         if (common->alpha_map)
 203             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 204
 205         if (image->type == LINEAR ||
 206             image->type == RADIAL ||
 207             image->type == CONICAL)
 208         {
 209             if (image->gradient.stops)
 210                 free (image->gradient.stops);
 211         }
 212
 213         if (image->type == BITS && image->bits.free_me)
 214             free (image->bits.free_me);
 215
 216         free (image);
 217
 218         return TRUE;
 219     }
 220
 221     return FALSE;
 222 }
 223
 224 PIXMAN_EXPORT void
 225 pixman_image_set_destroy_function (pixman_image_t *            image,
 226                                    pixman_image_destroy_func_t func,
 227                                    void *                      data)
 228 {
 229     image->common.destroy_func = func;
 230     image->common.destroy_data = data;
 231 }
 232
 233 PIXMAN_EXPORT void *
 234 pixman_image_get_destroy_data (pixman_image_t *image)
 235 {
 236   return image->common.destroy_data;
 237 }
 238
 239 void
 240 _pixman_image_reset_clip_region (pixman_image_t *image)
 241 {
 242     image->common.have_clip_region = FALSE;
 243 }
 244
 245 static pixman_bool_t out_of_bounds_workaround = TRUE;
 246
 247 /* Old X servers rely on out-of-bounds accesses when they are asked
 248  * to composite with a window as the source. They create a pixman image
 249  * pointing to some bogus position in memory, but then they set a clip
 250  * region to the position where the actual bits are.
 251  *
 252  * Due to a bug in old versions of pixman, where it would not clip
 253  * against the image bounds when a clip region was set, this would
 254  * actually work. So by default we allow certain out-of-bound access
 255  * to happen unless explicitly disabled.
 256  *
 257  * Fixed X servers should call this function to disable the workaround.
 258  */
 259 PIXMAN_EXPORT void
 260 pixman_disable_out_of_bounds_workaround (void)
 261 {
 262     out_of_bounds_workaround = FALSE;
 263 }
 264
 265 static pixman_bool_t
 266 source_image_needs_out_of_bounds_workaround (bits_image_t *image)
 267 {
 268     if (image->common.clip_sources                      &&
 269         image->common.repeat == PIXMAN_REPEAT_NONE      &&
 270         image->common.have_clip_region                  &&
 271         out_of_bounds_workaround)
 272     {
 273         if (!image->common.client_clip)
 274         {
 275             /* There is no client clip, so if the clip region extends beyond the
 276              * drawable geometry, it must be because the X server generated the
 277              * bogus clip region.
 278              */
 279             const pixman_box32_t *extents =
 280                 pixman_region32_extents (&image->common.clip_region);
 281
 282             if (extents->x1 >= 0 && extents->x2 <= image->width &&
 283                 extents->y1 >= 0 && extents->y2 <= image->height)
 284             {
 285                 return FALSE;
 286             }
 287         }
 288
 289         return TRUE;
 290     }
 291
 292     return FALSE;
 293 }
 294
 295 static void
 296 compute_image_info (pixman_image_t *image)
 297 {
 298     pixman_format_code_t code;
 299     uint32_t flags = 0;
 300
 301     /* Transform */
 302     if (!image->common.transform)
 303     {
 304         flags |= FAST_PATH_ID_TRANSFORM;
 305     }
 306     else if (image->common.transform->matrix[0][1] == 0 &&
 307              image->common.transform->matrix[1][0] == 0 &&
 308              image->common.transform->matrix[2][0] == 0 &&
 309              image->common.transform->matrix[2][1] == 0 &&
 310              image->common.transform->matrix[2][2] == pixman_fixed_1)
 311     {
 312         flags |= FAST_PATH_SCALE_TRANSFORM;
 313     }
 314
 315     /* Alpha map */
 316     if (!image->common.alpha_map)
 317         flags |= FAST_PATH_NO_ALPHA_MAP;
 318
 319     /* Filter */
 320     switch (image->common.filter)
 321     {
 322     case PIXMAN_FILTER_NEAREST:
 323     case PIXMAN_FILTER_FAST:
 324         flags |= (FAST_PATH_NEAREST_FILTER | FAST_PATH_NO_CONVOLUTION_FILTER);
 325         break;
 326
 327     case PIXMAN_FILTER_CONVOLUTION:
 328         break;
 329
 330     default:
 331         flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
 332         break;
 333     }
 334
 335     /* Repeat mode */
 336     switch (image->common.repeat)
 337     {
 338     case PIXMAN_REPEAT_REFLECT:
 339         flags |= FAST_PATH_NO_PAD_REPEAT;
 340         break;
 341
 342     case PIXMAN_REPEAT_PAD:
 343         flags |= FAST_PATH_NO_REFLECT_REPEAT;
 344         break;
 345
 346     default:
 347         flags |= (FAST_PATH_NO_REFLECT_REPEAT | FAST_PATH_NO_PAD_REPEAT);
 348         break;
 349     }
 350
 351     /* Component alpha */
 352     if (image->common.component_alpha)
 353         flags |= FAST_PATH_COMPONENT_ALPHA;
 354     else
 355         flags |= FAST_PATH_UNIFIED_ALPHA;
 356
 357     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NO_WIDE_FORMAT);
 358
 359     /* Type specific checks */
 360     switch (image->type)
 361     {
 362     case SOLID:
 363         code = PIXMAN_solid;
 364
 365         if (image->solid.color.alpha == 0xffff)
 366             flags |= FAST_PATH_IS_OPAQUE;
 367         break;
 368
 369     case BITS:
 370         if (image->bits.width == 1      &&
 371             image->bits.height == 1     &&
 372             image->common.repeat != PIXMAN_REPEAT_NONE)
 373         {
 374             code = PIXMAN_solid;
 375         }
 376         else
 377         {
 378             code = image->bits.format;
 379
 380             if (!image->common.transform &&
 381                 image->common.repeat == PIXMAN_REPEAT_NORMAL)
 382             {
 383                 flags |= FAST_PATH_SIMPLE_REPEAT;
 384             }
 385         }
 386
 387         if (image->common.repeat != PIXMAN_REPEAT_NONE &&
 388             !PIXMAN_FORMAT_A (image->bits.format))
 389         {
 390             flags |= FAST_PATH_IS_OPAQUE;
 391         }
 392
 393         if (source_image_needs_out_of_bounds_workaround (&image->bits))
 394             flags |= FAST_PATH_NEEDS_WORKAROUND;
 395
 396         if (image->bits.read_func || image->bits.write_func)
 397             flags &= ~FAST_PATH_NO_ACCESSORS;
 398
 399         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 400             flags &= ~FAST_PATH_NO_WIDE_FORMAT;
 401         break;
 402
 403     case LINEAR:
 404     case RADIAL:
 405         code = PIXMAN_unknown;
 406
 407         if (image->common.repeat != PIXMAN_REPEAT_NONE)
 408         {
 409             int i;
 410
 411             flags |= FAST_PATH_IS_OPAQUE;
 412             for (i = 0; i < image->gradient.n_stops; ++i)
 413             {
 414                 if (image->gradient.stops[i].color.alpha != 0xffff)
 415                 {
 416                     flags &= ~FAST_PATH_IS_OPAQUE;
 417                     break;
 418                 }
 419             }
 420         }
 421         break;
 422
 423     default:
 424         code = PIXMAN_unknown;
 425         break;
 426     }
 427
 428     /* Both alpha maps and convolution filters can introduce
 429      * non-opaqueness in otherwise opaque images. Also
 430      * an image with component alpha turned on is only opaque
 431      * if all channels are opaque, so we simply turn it off
 432      * unconditionally for those images.
 433      */
 434     if (image->common.alpha_map                                 ||
 435         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 436         image->common.component_alpha)
 437     {
 438         flags &= ~FAST_PATH_IS_OPAQUE;
 439     }
 440
 441     image->common.flags = flags;
 442     image->common.extended_format_code = code;
 443 }
 444
 445 void
 446 _pixman_image_validate (pixman_image_t *image)
 447 {
 448     if (image->common.dirty)
 449     {
 450         compute_image_info (image);
 451
 452         /* It is important that property_changed is
 453          * called *after* compute_image_info() because
 454          * property_changed() can make use of the flags
 455          * to set up accessors etc.
 456          */
 457         image->common.property_changed (image);
 458
 459         image->common.dirty = FALSE;
 460     }
 461
 462     if (image->common.alpha_map)
 463         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 464 }
 465
 466 PIXMAN_EXPORT pixman_bool_t
 467 pixman_image_set_clip_region32 (pixman_image_t *   image,
 468                                 pixman_region32_t *region)
 469 {
 470     image_common_t *common = (image_common_t *)image;
 471     pixman_bool_t result;
 472
 473     if (region)
 474     {
 475         if ((result = pixman_region32_copy (&common->clip_region, region)))
 476             image->common.have_clip_region = TRUE;
 477     }
 478     else
 479     {
 480         _pixman_image_reset_clip_region (image);
 481
 482         result = TRUE;
 483     }
 484
 485     image_property_changed (image);
 486
 487     return result;
 488 }
 489
 490 PIXMAN_EXPORT pixman_bool_t
 491 pixman_image_set_clip_region (pixman_image_t *   image,
 492                               pixman_region16_t *region)
 493 {
 494     image_common_t *common = (image_common_t *)image;
 495     pixman_bool_t result;
 496
 497     if (region)
 498     {
 499         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 500             image->common.have_clip_region = TRUE;
 501     }
 502     else
 503     {
 504         _pixman_image_reset_clip_region (image);
 505
 506         result = TRUE;
 507     }
 508
 509     image_property_changed (image);
 510
 511     return result;
 512 }
 513
 514 PIXMAN_EXPORT void
 515 pixman_image_set_has_client_clip (pixman_image_t *image,
 516                                   pixman_bool_t   client_clip)
 517 {
 518     image->common.client_clip = client_clip;
 519 }
 520
 521 PIXMAN_EXPORT pixman_bool_t
 522 pixman_image_set_transform (pixman_image_t *          image,
 523                             const pixman_transform_t *transform)
 524 {
 525     static const pixman_transform_t id =
 526     {
 527         { { pixman_fixed_1, 0, 0 },
 528           { 0, pixman_fixed_1, 0 },
 529           { 0, 0, pixman_fixed_1 } }
 530     };
 531
 532     image_common_t *common = (image_common_t *)image;
 533     pixman_bool_t result;
 534
 535     if (common->transform == transform)
 536         return TRUE;
 537
 538     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 539     {
 540         free (common->transform);
 541         common->transform = NULL;
 542         result = TRUE;
 543
 544         goto out;
 545     }
 546
 547     if (common->transform == NULL)
 548         common->transform = malloc (sizeof (pixman_transform_t));
 549
 550     if (common->transform == NULL)
 551     {
 552         result = FALSE;
 553
 554         goto out;
 555     }
 556
 557     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 558
 559     result = TRUE;
 560
 561 out:
 562     image_property_changed (image);
 563
 564     return result;
 565 }
 566
 567 PIXMAN_EXPORT void
 568 pixman_image_set_repeat (pixman_image_t *image,
 569                          pixman_repeat_t repeat)
 570 {
 571     image->common.repeat = repeat;
 572
 573     image_property_changed (image);
 574 }
 575
 576 PIXMAN_EXPORT pixman_bool_t
 577 pixman_image_set_filter (pixman_image_t *      image,
 578                          pixman_filter_t       filter,
 579                          const pixman_fixed_t *params,
 580                          int                   n_params)
 581 {
 582     image_common_t *common = (image_common_t *)image;
 583     pixman_fixed_t *new_params;
 584
 585     if (params == common->filter_params && filter == common->filter)
 586         return TRUE;
 587
 588     new_params = NULL;
 589     if (params)
 590     {
 591         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 592         if (!new_params)
 593             return FALSE;
 594
 595         memcpy (new_params,
 596                 params, n_params * sizeof (pixman_fixed_t));
 597     }
 598
 599     common->filter = filter;
 600
 601     if (common->filter_params)
 602         free (common->filter_params);
 603
 604     common->filter_params = new_params;
 605     common->n_filter_params = n_params;
 606
 607     image_property_changed (image);
 608     return TRUE;
 609 }
 610
 611 PIXMAN_EXPORT void
 612 pixman_image_set_source_clipping (pixman_image_t *image,
 613                                   pixman_bool_t   clip_sources)
 614 {
 615     image->common.clip_sources = clip_sources;
 616
 617     image_property_changed (image);
 618 }
 619
 620 /* Unlike all the other property setters, this function does not
 621  * copy the content of indexed. Doing this copying is simply
 622  * way, way too expensive.
 623  */
 624 PIXMAN_EXPORT void
 625 pixman_image_set_indexed (pixman_image_t *        image,
 626                           const pixman_indexed_t *indexed)
 627 {
 628     bits_image_t *bits = (bits_image_t *)image;
 629
 630     bits->indexed = indexed;
 631
 632     image_property_changed (image);
 633 }
 634
 635 PIXMAN_EXPORT void
 636 pixman_image_set_alpha_map (pixman_image_t *image,
 637                             pixman_image_t *alpha_map,
 638                             int16_t         x,
 639                             int16_t         y)
 640 {
 641     image_common_t *common = (image_common_t *)image;
 642
 643     return_if_fail (!alpha_map || alpha_map->type == BITS);
 644
 645     if (common->alpha_map != (bits_image_t *)alpha_map)
 646     {
 647         if (common->alpha_map)
 648             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 649
 650         if (alpha_map)
 651             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 652         else
 653             common->alpha_map = NULL;
 654     }
 655
 656     common->alpha_origin_x = x;
 657     common->alpha_origin_y = y;
 658
 659     image_property_changed (image);
 660 }
 661
 662 PIXMAN_EXPORT void
 663 pixman_image_set_component_alpha   (pixman_image_t *image,
 664                                     pixman_bool_t   component_alpha)
 665 {
 666     image->common.component_alpha = component_alpha;
 667
 668     image_property_changed (image);
 669 }
 670
 671 PIXMAN_EXPORT void
 672 pixman_image_set_accessors (pixman_image_t *           image,
 673                             pixman_read_memory_func_t  read_func,
 674                             pixman_write_memory_func_t write_func)
 675 {
 676     return_if_fail (image != NULL);
 677
 678     if (image->type == BITS)
 679     {
 680         image->bits.read_func = read_func;
 681         image->bits.write_func = write_func;
 682
 683         image_property_changed (image);
 684     }
 685 }
 686
 687 PIXMAN_EXPORT uint32_t *
 688 pixman_image_get_data (pixman_image_t *image)
 689 {
 690     if (image->type == BITS)
 691         return image->bits.bits;
 692
 693     return NULL;
 694 }
 695
 696 PIXMAN_EXPORT int
 697 pixman_image_get_width (pixman_image_t *image)
 698 {
 699     if (image->type == BITS)
 700         return image->bits.width;
 701
 702     return 0;
 703 }
 704
 705 PIXMAN_EXPORT int
 706 pixman_image_get_height (pixman_image_t *image)
 707 {
 708     if (image->type == BITS)
 709         return image->bits.height;
 710
 711     return 0;
 712 }
 713
 714 PIXMAN_EXPORT int
 715 pixman_image_get_stride (pixman_image_t *image)
 716 {
 717     if (image->type == BITS)
 718         return image->bits.rowstride * (int) sizeof (uint32_t);
 719
 720     return 0;
 721 }
 722
 723 PIXMAN_EXPORT int
 724 pixman_image_get_depth (pixman_image_t *image)
 725 {
 726     if (image->type == BITS)
 727         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 728
 729     return 0;
 730 }
 731
 732 uint32_t
 733 _pixman_image_get_solid (pixman_image_t *     image,
 734                          pixman_format_code_t format)
 735 {
 736     uint32_t result;
 737
 738     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL, 0);
 739
 740     /* If necessary, convert RGB <--> BGR. */
 741     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 742     {
 743         result = (((result & 0xff000000) >>  0) |
 744                   ((result & 0x00ff0000) >> 16) |
 745                   ((result & 0x0000ff00) >>  0) |
 746                   ((result & 0x000000ff) << 16));
 747     }
 748
 749     return result;
 750 }