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 = pixman_region32_extents (&image->common.clip_region);
 280
 281             if (extents->x1 >= 0 && extents->x2 <= image->width &&
 282                 extents->y1 >= 0 && extents->y2 <= image->height)
 283             {
 284                 return FALSE;
 285             }
 286         }
 287
 288         return TRUE;
 289     }
 290
 291     return FALSE;
 292 }
 293
 294 static void
 295 compute_image_info (pixman_image_t *image)
 296 {
 297     pixman_format_code_t code;
 298     uint32_t flags = 0;
 299
 300     if (!image->common.transform)
 301     {
 302         flags |= FAST_PATH_ID_TRANSFORM;
 303     }
 304     else if (image->common.transform &&
 305              image->common.transform->matrix[0][1] == 0 &&
 306              image->common.transform->matrix[1][0] == 0 &&
 307              image->common.transform->matrix[2][0] == 0 &&
 308              image->common.transform->matrix[2][1] == 0 &&
 309              image->common.transform->matrix[2][2] == pixman_fixed_1)
 310     {
 311         flags |= FAST_PATH_SCALE_TRANSFORM;
 312     }
 313
 314     if (!image->common.alpha_map)
 315         flags |= FAST_PATH_NO_ALPHA_MAP;
 316
 317     if (image->common.filter != PIXMAN_FILTER_CONVOLUTION)
 318     {
 319         flags |= FAST_PATH_NO_CONVOLUTION_FILTER;
 320
 321         if (image->common.filter == PIXMAN_FILTER_NEAREST)
 322             flags |= FAST_PATH_NEAREST_FILTER;
 323     }
 324
 325     if (image->common.repeat != PIXMAN_REPEAT_PAD)
 326         flags |= FAST_PATH_NO_PAD_REPEAT;
 327
 328     if (image->common.repeat != PIXMAN_REPEAT_REFLECT)
 329         flags |= FAST_PATH_NO_REFLECT_REPEAT;
 330
 331     flags |= (FAST_PATH_NO_ACCESSORS | FAST_PATH_NO_WIDE_FORMAT);
 332     if (image->common.type == BITS)
 333     {
 334         if (image->bits.read_func || image->bits.write_func)
 335             flags &= ~FAST_PATH_NO_ACCESSORS;
 336
 337         if (PIXMAN_FORMAT_IS_WIDE (image->bits.format))
 338             flags &= ~FAST_PATH_NO_WIDE_FORMAT;
 339     }
 340
 341     if (image->common.component_alpha)
 342         flags |= FAST_PATH_COMPONENT_ALPHA;
 343     else
 344         flags |= FAST_PATH_UNIFIED_ALPHA;
 345
 346     if (image->type == SOLID)
 347     {
 348         code = PIXMAN_solid;
 349
 350         if (image->solid.color.alpha == 0xffff)
 351             flags |= FAST_PATH_IS_OPAQUE;
 352     }
 353     else if (image->common.type == BITS)
 354     {
 355         if (image->bits.width == 1      &&
 356             image->bits.height == 1     &&
 357             image->common.repeat != PIXMAN_REPEAT_NONE)
 358         {
 359             code = PIXMAN_solid;
 360         }
 361         else
 362         {
 363             code = image->bits.format;
 364
 365             if (!image->common.transform &&
 366                 image->common.repeat == PIXMAN_REPEAT_NORMAL)
 367             {
 368                 flags |= FAST_PATH_SIMPLE_REPEAT;
 369             }
 370         }
 371
 372         if (image->common.repeat != PIXMAN_REPEAT_NONE &&
 373             !PIXMAN_FORMAT_A (image->bits.format))
 374         {
 375             flags |= FAST_PATH_IS_OPAQUE;
 376         }
 377
 378         if (source_image_needs_out_of_bounds_workaround (&image->bits))
 379             flags |= FAST_PATH_NEEDS_WORKAROUND;
 380     }
 381     else
 382     {
 383         code = PIXMAN_unknown;
 384
 385         if (image->type == LINEAR || image->type == RADIAL)
 386         {
 387             if (image->common.repeat != PIXMAN_REPEAT_NONE)
 388             {
 389                 int i;
 390
 391                 flags |= FAST_PATH_IS_OPAQUE;
 392
 393                 for (i = 0; i < image->gradient.n_stops; ++i)
 394                 {
 395                     if (image->gradient.stops[i].color.alpha != 0xffff)
 396                     {
 397                         flags &= ~FAST_PATH_IS_OPAQUE;
 398                         break;
 399                     }
 400                 }
 401             }
 402         }
 403     }
 404
 405     /* Both alpha maps and convolution filters can introduce
 406      * non-opaqueness in otherwise opaque images. Also
 407      * an image with component alpha turned on is only opaque
 408      * if all channels are opaque, so we simply turn it off
 409      * unconditionally for those images.
 410      */
 411     if (image->common.alpha_map                                 ||
 412         image->common.filter == PIXMAN_FILTER_CONVOLUTION       ||
 413         image->common.component_alpha)
 414     {
 415         flags &= ~FAST_PATH_IS_OPAQUE;
 416     }
 417
 418     image->common.flags = flags;
 419     image->common.extended_format_code = code;
 420 }
 421
 422 void
 423 _pixman_image_validate (pixman_image_t *image)
 424 {
 425     if (image->common.dirty)
 426     {
 427         compute_image_info (image);
 428
 429         /* It is important that property_changed is
 430          * called *after* compute_image_info() because
 431          * property_changed() can make use of the flags
 432          * to set up accessors etc.
 433          */
 434         image->common.property_changed (image);
 435
 436         image->common.dirty = FALSE;
 437     }
 438
 439     if (image->common.alpha_map)
 440         _pixman_image_validate ((pixman_image_t *)image->common.alpha_map);
 441 }
 442
 443 PIXMAN_EXPORT pixman_bool_t
 444 pixman_image_set_clip_region32 (pixman_image_t *   image,
 445                                 pixman_region32_t *region)
 446 {
 447     image_common_t *common = (image_common_t *)image;
 448     pixman_bool_t result;
 449
 450     if (region)
 451     {
 452         if ((result = pixman_region32_copy (&common->clip_region, region)))
 453             image->common.have_clip_region = TRUE;
 454     }
 455     else
 456     {
 457         _pixman_image_reset_clip_region (image);
 458
 459         result = TRUE;
 460     }
 461
 462     image_property_changed (image);
 463
 464     return result;
 465 }
 466
 467 PIXMAN_EXPORT pixman_bool_t
 468 pixman_image_set_clip_region (pixman_image_t *   image,
 469                               pixman_region16_t *region)
 470 {
 471     image_common_t *common = (image_common_t *)image;
 472     pixman_bool_t result;
 473
 474     if (region)
 475     {
 476         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 477             image->common.have_clip_region = TRUE;
 478     }
 479     else
 480     {
 481         _pixman_image_reset_clip_region (image);
 482
 483         result = TRUE;
 484     }
 485
 486     image_property_changed (image);
 487
 488     return result;
 489 }
 490
 491 PIXMAN_EXPORT void
 492 pixman_image_set_has_client_clip (pixman_image_t *image,
 493                                   pixman_bool_t   client_clip)
 494 {
 495     image->common.client_clip = client_clip;
 496 }
 497
 498 PIXMAN_EXPORT pixman_bool_t
 499 pixman_image_set_transform (pixman_image_t *          image,
 500                             const pixman_transform_t *transform)
 501 {
 502     static const pixman_transform_t id =
 503     {
 504         { { pixman_fixed_1, 0, 0 },
 505           { 0, pixman_fixed_1, 0 },
 506           { 0, 0, pixman_fixed_1 } }
 507     };
 508
 509     image_common_t *common = (image_common_t *)image;
 510     pixman_bool_t result;
 511
 512     if (common->transform == transform)
 513         return TRUE;
 514
 515     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 516     {
 517         free (common->transform);
 518         common->transform = NULL;
 519         result = TRUE;
 520
 521         goto out;
 522     }
 523
 524     if (common->transform == NULL)
 525         common->transform = malloc (sizeof (pixman_transform_t));
 526
 527     if (common->transform == NULL)
 528     {
 529         result = FALSE;
 530
 531         goto out;
 532     }
 533
 534     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 535
 536     result = TRUE;
 537
 538 out:
 539     image_property_changed (image);
 540
 541     return result;
 542 }
 543
 544 PIXMAN_EXPORT void
 545 pixman_image_set_repeat (pixman_image_t *image,
 546                          pixman_repeat_t repeat)
 547 {
 548     image->common.repeat = repeat;
 549
 550     image_property_changed (image);
 551 }
 552
 553 PIXMAN_EXPORT pixman_bool_t
 554 pixman_image_set_filter (pixman_image_t *      image,
 555                          pixman_filter_t       filter,
 556                          const pixman_fixed_t *params,
 557                          int                   n_params)
 558 {
 559     image_common_t *common = (image_common_t *)image;
 560     pixman_fixed_t *new_params;
 561
 562     if (params == common->filter_params && filter == common->filter)
 563         return TRUE;
 564
 565     new_params = NULL;
 566     if (params)
 567     {
 568         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 569         if (!new_params)
 570             return FALSE;
 571
 572         memcpy (new_params,
 573                 params, n_params * sizeof (pixman_fixed_t));
 574     }
 575
 576     common->filter = filter;
 577
 578     if (common->filter_params)
 579         free (common->filter_params);
 580
 581     common->filter_params = new_params;
 582     common->n_filter_params = n_params;
 583
 584     image_property_changed (image);
 585     return TRUE;
 586 }
 587
 588 PIXMAN_EXPORT void
 589 pixman_image_set_source_clipping (pixman_image_t *image,
 590                                   pixman_bool_t   clip_sources)
 591 {
 592     image->common.clip_sources = clip_sources;
 593
 594     image_property_changed (image);
 595 }
 596
 597 /* Unlike all the other property setters, this function does not
 598  * copy the content of indexed. Doing this copying is simply
 599  * way, way too expensive.
 600  */
 601 PIXMAN_EXPORT void
 602 pixman_image_set_indexed (pixman_image_t *        image,
 603                           const pixman_indexed_t *indexed)
 604 {
 605     bits_image_t *bits = (bits_image_t *)image;
 606
 607     bits->indexed = indexed;
 608
 609     image_property_changed (image);
 610 }
 611
 612 PIXMAN_EXPORT void
 613 pixman_image_set_alpha_map (pixman_image_t *image,
 614                             pixman_image_t *alpha_map,
 615                             int16_t         x,
 616                             int16_t         y)
 617 {
 618     image_common_t *common = (image_common_t *)image;
 619
 620     return_if_fail (!alpha_map || alpha_map->type == BITS);
 621
 622     if (common->alpha_map != (bits_image_t *)alpha_map)
 623     {
 624         if (common->alpha_map)
 625             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 626
 627         if (alpha_map)
 628             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 629         else
 630             common->alpha_map = NULL;
 631     }
 632
 633     common->alpha_origin_x = x;
 634     common->alpha_origin_y = y;
 635
 636     image_property_changed (image);
 637 }
 638
 639 PIXMAN_EXPORT void
 640 pixman_image_set_component_alpha   (pixman_image_t *image,
 641                                     pixman_bool_t   component_alpha)
 642 {
 643     image->common.component_alpha = component_alpha;
 644
 645     image_property_changed (image);
 646 }
 647
 648 PIXMAN_EXPORT void
 649 pixman_image_set_accessors (pixman_image_t *           image,
 650                             pixman_read_memory_func_t  read_func,
 651                             pixman_write_memory_func_t write_func)
 652 {
 653     return_if_fail (image != NULL);
 654
 655     if (image->type == BITS)
 656     {
 657         image->bits.read_func = read_func;
 658         image->bits.write_func = write_func;
 659
 660         image_property_changed (image);
 661     }
 662 }
 663
 664 PIXMAN_EXPORT uint32_t *
 665 pixman_image_get_data (pixman_image_t *image)
 666 {
 667     if (image->type == BITS)
 668         return image->bits.bits;
 669
 670     return NULL;
 671 }
 672
 673 PIXMAN_EXPORT int
 674 pixman_image_get_width (pixman_image_t *image)
 675 {
 676     if (image->type == BITS)
 677         return image->bits.width;
 678
 679     return 0;
 680 }
 681
 682 PIXMAN_EXPORT int
 683 pixman_image_get_height (pixman_image_t *image)
 684 {
 685     if (image->type == BITS)
 686         return image->bits.height;
 687
 688     return 0;
 689 }
 690
 691 PIXMAN_EXPORT int
 692 pixman_image_get_stride (pixman_image_t *image)
 693 {
 694     if (image->type == BITS)
 695         return image->bits.rowstride * (int) sizeof (uint32_t);
 696
 697     return 0;
 698 }
 699
 700 PIXMAN_EXPORT int
 701 pixman_image_get_depth (pixman_image_t *image)
 702 {
 703     if (image->type == BITS)
 704         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 705
 706     return 0;
 707 }
 708
 709 uint32_t
 710 _pixman_image_get_solid (pixman_image_t *     image,
 711                          pixman_format_code_t format)
 712 {
 713     uint32_t result;
 714
 715     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL, 0);
 716
 717     /* If necessary, convert RGB <--> BGR. */
 718     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 719     {
 720         result = (((result & 0xff000000) >>  0) |
 721                   ((result & 0x00ff0000) >> 16) |
 722                   ((result & 0x0000ff00) >>  0) |
 723                   ((result & 0x000000ff) << 16));
 724     }
 725
 726     return result;
 727 }