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