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->color_table = NULL;
  52     gradient->color_table_size = 0;
  53     gradient->common.class = SOURCE_IMAGE_CLASS_UNKNOWN;
  54
  55     return TRUE;
  56 }
  57
  58 /*
  59  * By default, just evaluate the image at 32bpp and expand.  Individual image
  60  * types can plug in a better scanline getter if they want to. For example
  61  * we  could produce smoother gradients by evaluating them at higher color
  62  * depth, but that's a project for the future.
  63  */
  64 void
  65 _pixman_image_get_scanline_generic_64 (pixman_image_t * image,
  66                                        int              x,
  67                                        int              y,
  68                                        int              width,
  69                                        uint32_t *       buffer,
  70                                        const uint32_t * mask,
  71                                        uint32_t         mask_bits)
  72 {
  73     uint32_t *mask8 = NULL;
  74
  75     /* Contract the mask image, if one exists, so that the 32-bit fetch
  76      * function can use it.
  77      */
  78     if (mask)
  79     {
  80         mask8 = pixman_malloc_ab (width, sizeof(uint32_t));
  81         if (!mask8)
  82             return;
  83
  84         pixman_contract (mask8, (uint64_t *)mask, width);
  85     }
  86
  87     /* Fetch the source image into the first half of buffer. */
  88     _pixman_image_get_scanline_32 (image, x, y, width, (uint32_t*)buffer, mask8,
  89                                    mask_bits);
  90
  91     /* Expand from 32bpp to 64bpp in place. */
  92     pixman_expand ((uint64_t *)buffer, buffer, PIXMAN_a8r8g8b8, width);
  93
  94     free (mask8);
  95 }
  96
  97 pixman_image_t *
  98 _pixman_image_allocate (void)
  99 {
 100     pixman_image_t *image = malloc (sizeof (pixman_image_t));
 101
 102     if (image)
 103     {
 104         image_common_t *common = &image->common;
 105
 106         pixman_region32_init (&common->clip_region);
 107
 108         common->have_clip_region = FALSE;
 109         common->clip_sources = FALSE;
 110         common->transform = NULL;
 111         common->repeat = PIXMAN_REPEAT_NONE;
 112         common->filter = PIXMAN_FILTER_NEAREST;
 113         common->filter_params = NULL;
 114         common->n_filter_params = 0;
 115         common->alpha_map = NULL;
 116         common->component_alpha = FALSE;
 117         common->ref_count = 1;
 118         common->classify = NULL;
 119         common->client_clip = FALSE;
 120         common->destroy_func = NULL;
 121         common->destroy_data = NULL;
 122         common->need_workaround = FALSE;
 123         common->dirty = TRUE;
 124     }
 125
 126     return image;
 127 }
 128
 129 source_image_class_t
 130 _pixman_image_classify (pixman_image_t *image,
 131                         int             x,
 132                         int             y,
 133                         int             width,
 134                         int             height)
 135 {
 136     if (image->common.classify)
 137         return image->common.classify (image, x, y, width, height);
 138     else
 139         return SOURCE_IMAGE_CLASS_UNKNOWN;
 140 }
 141
 142 void
 143 _pixman_image_get_scanline_32 (pixman_image_t *image,
 144                                int             x,
 145                                int             y,
 146                                int             width,
 147                                uint32_t *      buffer,
 148                                const uint32_t *mask,
 149                                uint32_t        mask_bits)
 150 {
 151     image->common.get_scanline_32 (image, x, y, width, buffer, mask, mask_bits);
 152 }
 153
 154 /* Even thought the type of buffer is uint32_t *, the function actually expects
 155  * a uint64_t *buffer.
 156  */
 157 void
 158 _pixman_image_get_scanline_64 (pixman_image_t *image,
 159                                int             x,
 160                                int             y,
 161                                int             width,
 162                                uint32_t *      buffer,
 163                                const uint32_t *unused,
 164                                uint32_t        unused2)
 165 {
 166     image->common.get_scanline_64 (image, x, y, width, buffer, unused, unused2);
 167 }
 168
 169 static void
 170 image_property_changed (pixman_image_t *image)
 171 {
 172     image->common.dirty = TRUE;
 173 }
 174
 175 /* Ref Counting */
 176 PIXMAN_EXPORT pixman_image_t *
 177 pixman_image_ref (pixman_image_t *image)
 178 {
 179     image->common.ref_count++;
 180
 181     return image;
 182 }
 183
 184 /* returns TRUE when the image is freed */
 185 PIXMAN_EXPORT pixman_bool_t
 186 pixman_image_unref (pixman_image_t *image)
 187 {
 188     image_common_t *common = (image_common_t *)image;
 189
 190     common->ref_count--;
 191
 192     if (common->ref_count == 0)
 193     {
 194         if (image->common.destroy_func)
 195             image->common.destroy_func (image, image->common.destroy_data);
 196
 197         pixman_region32_fini (&common->clip_region);
 198
 199         if (common->transform)
 200             free (common->transform);
 201
 202         if (common->filter_params)
 203             free (common->filter_params);
 204
 205         if (common->alpha_map)
 206             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 207
 208         if (image->type == LINEAR ||
 209             image->type == RADIAL ||
 210             image->type == CONICAL)
 211         {
 212             if (image->gradient.stops)
 213                 free (image->gradient.stops);
 214         }
 215
 216         if (image->type == BITS && image->bits.free_me)
 217             free (image->bits.free_me);
 218
 219         free (image);
 220
 221         return TRUE;
 222     }
 223
 224     return FALSE;
 225 }
 226
 227 PIXMAN_EXPORT void
 228 pixman_image_set_destroy_function (pixman_image_t *            image,
 229                                    pixman_image_destroy_func_t func,
 230                                    void *                      data)
 231 {
 232     image->common.destroy_func = func;
 233     image->common.destroy_data = data;
 234 }
 235
 236 void
 237 _pixman_image_reset_clip_region (pixman_image_t *image)
 238 {
 239     image->common.have_clip_region = FALSE;
 240 }
 241
 242 void
 243 _pixman_image_validate (pixman_image_t *image)
 244 {
 245     if (image->common.dirty)
 246     {
 247         image->common.property_changed (image);
 248         image->common.dirty = FALSE;
 249     }
 250 }
 251
 252 PIXMAN_EXPORT pixman_bool_t
 253 pixman_image_set_clip_region32 (pixman_image_t *   image,
 254                                 pixman_region32_t *region)
 255 {
 256     image_common_t *common = (image_common_t *)image;
 257     pixman_bool_t result;
 258
 259     if (region)
 260     {
 261         if ((result = pixman_region32_copy (&common->clip_region, region)))
 262             image->common.have_clip_region = TRUE;
 263     }
 264     else
 265     {
 266         _pixman_image_reset_clip_region (image);
 267
 268         result = TRUE;
 269     }
 270
 271     image_property_changed (image);
 272
 273     return result;
 274 }
 275
 276 PIXMAN_EXPORT pixman_bool_t
 277 pixman_image_set_clip_region (pixman_image_t *   image,
 278                               pixman_region16_t *region)
 279 {
 280     image_common_t *common = (image_common_t *)image;
 281     pixman_bool_t result;
 282
 283     if (region)
 284     {
 285         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 286             image->common.have_clip_region = TRUE;
 287     }
 288     else
 289     {
 290         _pixman_image_reset_clip_region (image);
 291
 292         result = TRUE;
 293     }
 294
 295     image_property_changed (image);
 296
 297     return result;
 298 }
 299
 300 PIXMAN_EXPORT void
 301 pixman_image_set_has_client_clip (pixman_image_t *image,
 302                                   pixman_bool_t   client_clip)
 303 {
 304     image->common.client_clip = client_clip;
 305 }
 306
 307 PIXMAN_EXPORT pixman_bool_t
 308 pixman_image_set_transform (pixman_image_t *          image,
 309                             const pixman_transform_t *transform)
 310 {
 311     static const pixman_transform_t id =
 312     {
 313         { { pixman_fixed_1, 0, 0 },
 314           { 0, pixman_fixed_1, 0 },
 315           { 0, 0, pixman_fixed_1 }}
 316     };
 317
 318     image_common_t *common = (image_common_t *)image;
 319     pixman_bool_t result;
 320
 321     if (common->transform == transform)
 322         return TRUE;
 323
 324     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 325     {
 326         free (common->transform);
 327         common->transform = NULL;
 328         result = TRUE;
 329
 330         goto out;
 331     }
 332
 333     if (common->transform == NULL)
 334         common->transform = malloc (sizeof (pixman_transform_t));
 335
 336     if (common->transform == NULL)
 337     {
 338         result = FALSE;
 339
 340         goto out;
 341     }
 342
 343     memcpy (common->transform, transform, sizeof(pixman_transform_t));
 344
 345 out:
 346     image_property_changed (image);
 347
 348     return TRUE;
 349 }
 350
 351 PIXMAN_EXPORT void
 352 pixman_image_set_repeat (pixman_image_t *image,
 353                          pixman_repeat_t repeat)
 354 {
 355     image->common.repeat = repeat;
 356
 357     image_property_changed (image);
 358 }
 359
 360 PIXMAN_EXPORT pixman_bool_t
 361 pixman_image_set_filter (pixman_image_t *      image,
 362                          pixman_filter_t       filter,
 363                          const pixman_fixed_t *params,
 364                          int                   n_params)
 365 {
 366     image_common_t *common = (image_common_t *)image;
 367     pixman_fixed_t *new_params;
 368
 369     if (params == common->filter_params && filter == common->filter)
 370         return TRUE;
 371
 372     new_params = NULL;
 373     if (params)
 374     {
 375         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 376         if (!new_params)
 377             return FALSE;
 378
 379         memcpy (new_params,
 380                 params, n_params * sizeof (pixman_fixed_t));
 381     }
 382
 383     common->filter = filter;
 384
 385     if (common->filter_params)
 386         free (common->filter_params);
 387
 388     common->filter_params = new_params;
 389     common->n_filter_params = n_params;
 390
 391     image_property_changed (image);
 392     return TRUE;
 393 }
 394
 395 PIXMAN_EXPORT void
 396 pixman_image_set_source_clipping (pixman_image_t *image,
 397                                   pixman_bool_t   clip_sources)
 398 {
 399     image->common.clip_sources = clip_sources;
 400
 401     image_property_changed (image);
 402 }
 403
 404 /* Unlike all the other property setters, this function does not
 405  * copy the content of indexed. Doing this copying is simply
 406  * way, way too expensive.
 407  */
 408 PIXMAN_EXPORT void
 409 pixman_image_set_indexed (pixman_image_t *        image,
 410                           const pixman_indexed_t *indexed)
 411 {
 412     bits_image_t *bits = (bits_image_t *)image;
 413
 414     bits->indexed = indexed;
 415
 416     image_property_changed (image);
 417 }
 418
 419 PIXMAN_EXPORT void
 420 pixman_image_set_alpha_map (pixman_image_t *image,
 421                             pixman_image_t *alpha_map,
 422                             int16_t         x,
 423                             int16_t         y)
 424 {
 425     image_common_t *common = (image_common_t *)image;
 426
 427     return_if_fail (!alpha_map || alpha_map->type == BITS);
 428
 429     if (common->alpha_map != (bits_image_t *)alpha_map)
 430     {
 431         if (common->alpha_map)
 432             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 433
 434         if (alpha_map)
 435             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 436         else
 437             common->alpha_map = NULL;
 438     }
 439
 440     common->alpha_origin_x = x;
 441     common->alpha_origin_y = y;
 442
 443     image_property_changed (image);
 444 }
 445
 446 PIXMAN_EXPORT void
 447 pixman_image_set_component_alpha   (pixman_image_t *image,
 448                                     pixman_bool_t   component_alpha)
 449 {
 450     image->common.component_alpha = component_alpha;
 451
 452     image_property_changed (image);
 453 }
 454
 455 PIXMAN_EXPORT void
 456 pixman_image_set_accessors (pixman_image_t *           image,
 457                             pixman_read_memory_func_t  read_func,
 458                             pixman_write_memory_func_t write_func)
 459 {
 460     return_if_fail (image != NULL);
 461
 462     if (image->type == BITS)
 463     {
 464         image->bits.read_func = read_func;
 465         image->bits.write_func = write_func;
 466
 467         image_property_changed (image);
 468     }
 469 }
 470
 471 PIXMAN_EXPORT uint32_t *
 472 pixman_image_get_data (pixman_image_t *image)
 473 {
 474     if (image->type == BITS)
 475         return image->bits.bits;
 476
 477     return NULL;
 478 }
 479
 480 PIXMAN_EXPORT int
 481 pixman_image_get_width (pixman_image_t *image)
 482 {
 483     if (image->type == BITS)
 484         return image->bits.width;
 485
 486     return 0;
 487 }
 488
 489 PIXMAN_EXPORT int
 490 pixman_image_get_height (pixman_image_t *image)
 491 {
 492     if (image->type == BITS)
 493         return image->bits.height;
 494
 495     return 0;
 496 }
 497
 498 PIXMAN_EXPORT int
 499 pixman_image_get_stride (pixman_image_t *image)
 500 {
 501     if (image->type == BITS)
 502         return image->bits.rowstride * (int) sizeof (uint32_t);
 503
 504     return 0;
 505 }
 506
 507 PIXMAN_EXPORT int
 508 pixman_image_get_depth (pixman_image_t *image)
 509 {
 510     if (image->type == BITS)
 511         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 512
 513     return 0;
 514 }
 515
 516 pixman_bool_t
 517 _pixman_image_is_solid (pixman_image_t *image)
 518 {
 519     if (image->type == SOLID)
 520         return TRUE;
 521
 522     if (image->type != BITS     ||
 523         image->bits.width != 1  ||
 524         image->bits.height != 1)
 525     {
 526         return FALSE;
 527     }
 528
 529     if (image->common.repeat == PIXMAN_REPEAT_NONE)
 530         return FALSE;
 531
 532     return TRUE;
 533 }
 534
 535 uint32_t
 536 _pixman_image_get_solid (pixman_image_t *     image,
 537                          pixman_format_code_t format)
 538 {
 539     uint32_t result;
 540
 541     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL, 0);
 542
 543     /* If necessary, convert RGB <--> BGR. */
 544     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 545     {
 546         result = (((result & 0xff000000) >>  0) |
 547                   ((result & 0x00ff0000) >> 16) |
 548                   ((result & 0x0000ff00) >>  0) |
 549                   ((result & 0x000000ff) << 16));
 550     }
 551
 552     return result;
 553 }
 554
 555 pixman_bool_t
 556 _pixman_image_is_opaque (pixman_image_t *image)
 557 {
 558     int i;
 559
 560     if (image->common.alpha_map)
 561         return FALSE;
 562
 563     switch (image->type)
 564     {
 565     case BITS:
 566         if (image->common.repeat == PIXMAN_REPEAT_NONE)
 567             return FALSE;
 568
 569         if (PIXMAN_FORMAT_A (image->bits.format))
 570             return FALSE;
 571         break;
 572
 573     case LINEAR:
 574     case RADIAL:
 575         if (image->common.repeat == PIXMAN_REPEAT_NONE)
 576             return FALSE;
 577
 578         for (i = 0; i < image->gradient.n_stops; ++i)
 579         {
 580             if (image->gradient.stops[i].color.alpha != 0xffff)
 581                 return FALSE;
 582         }
 583         break;
 584
 585     case CONICAL:
 586         /* Conical gradients always have a transparent border */
 587         return FALSE;
 588         break;
 589
 590     case SOLID:
 591         if (ALPHA_8 (image->solid.color) != 0xff)
 592             return FALSE;
 593         break;
 594     }
 595
 596     /* Convolution filters can introduce translucency if the sum of the
 597      * weights is lower than 1.
 598      */
 599     if (image->common.filter == PIXMAN_FILTER_CONVOLUTION)
 600         return FALSE;
 601
 602     return TRUE;
 603 }
 604