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
  34 #define Alpha(x) ((x) >> 24)
  35
  36 pixman_bool_t
  37 _pixman_init_gradient (gradient_t     *gradient,
  38                        const pixman_gradient_stop_t *stops,
  39                        int             n_stops)
  40 {
  41     return_val_if_fail (n_stops > 0, FALSE);
  42
  43     gradient->stops = pixman_malloc_ab (n_stops, sizeof (pixman_gradient_stop_t));
  44     if (!gradient->stops)
  45         return FALSE;
  46
  47     memcpy (gradient->stops, stops, n_stops * sizeof (pixman_gradient_stop_t));
  48
  49     gradient->n_stops = n_stops;
  50
  51     gradient->stop_range = 0xffff;
  52     gradient->color_table = NULL;
  53     gradient->color_table_size = 0;
  54     gradient->common.class = SOURCE_IMAGE_CLASS_UNKNOWN;
  55
  56     return TRUE;
  57 }
  58
  59 /*
  60  * By default, just evaluate the image at 32bpp and expand.  Individual image
  61  * types can plug in a better scanline getter if they want to. For example
  62  * we  could produce smoother gradients by evaluating them at higher color
  63  * depth, but that's a project for the future.
  64  */
  65 void
  66 _pixman_image_get_scanline_64_generic (pixman_image_t * pict, int x, int y,
  67                                        int width, uint32_t *buffer,
  68                                        const uint32_t *mask, uint32_t maskBits)
  69 {
  70     uint32_t *mask8 = NULL;
  71
  72     // Contract the mask image, if one exists, so that the 32-bit fetch
  73     // function can use it.
  74     if (mask) {
  75         mask8 = pixman_malloc_ab(width, sizeof(uint32_t));
  76         if (!mask8)
  77             return;
  78
  79         pixman_contract (mask8, (uint64_t *)mask, width);
  80     }
  81
  82     // Fetch the source image into the first half of buffer.
  83     _pixman_image_get_scanline_32 (pict, x, y, width, (uint32_t*)buffer, mask8,
  84                                    maskBits);
  85
  86     // Expand from 32bpp to 64bpp in place.
  87     pixman_expand ((uint64_t *)buffer, buffer, PIXMAN_a8r8g8b8, width);
  88
  89     free (mask8);
  90 }
  91
  92 pixman_image_t *
  93 _pixman_image_allocate (void)
  94 {
  95     pixman_image_t *image = malloc (sizeof (pixman_image_t));
  96
  97     if (image)
  98     {
  99         image_common_t *common = &image->common;
 100
 101         pixman_region32_init (&common->clip_region);
 102
 103         common->have_clip_region = FALSE;
 104         common->clip_sources = FALSE;
 105         common->transform = NULL;
 106         common->repeat = PIXMAN_REPEAT_NONE;
 107         common->filter = PIXMAN_FILTER_NEAREST;
 108         common->filter_params = NULL;
 109         common->n_filter_params = 0;
 110         common->alpha_map = NULL;
 111         common->component_alpha = FALSE;
 112         common->ref_count = 1;
 113         common->read_func = NULL;
 114         common->write_func = NULL;
 115         common->classify = NULL;
 116         common->client_clip = FALSE;
 117         common->destroy_func = NULL;
 118         common->destroy_data = NULL;
 119     }
 120
 121     return image;
 122 }
 123
 124 source_pict_class_t
 125 _pixman_image_classify (pixman_image_t *image,
 126                         int             x,
 127                         int             y,
 128                         int             width,
 129                         int             height)
 130 {
 131     if (image->common.classify)
 132         return image->common.classify (image, x, y, width, height);
 133     else
 134         return SOURCE_IMAGE_CLASS_UNKNOWN;
 135 }
 136
 137 void
 138 _pixman_image_get_scanline_32 (pixman_image_t *image, int x, int y, int width, uint32_t *buffer,
 139                                const uint32_t *mask, uint32_t mask_bits)
 140 {
 141     image->common.get_scanline_32 (image, x, y, width, buffer, mask, mask_bits);
 142 }
 143
 144 /* Even thought the type of buffer is uint32_t *, the function actually expects
 145  * a uint64_t *buffer.
 146  */
 147 void
 148 _pixman_image_get_scanline_64 (pixman_image_t *image, int x, int y, int width, uint32_t *buffer,
 149                                const uint32_t *unused, uint32_t unused2)
 150 {
 151     image->common.get_scanline_64 (image, x, y, width, buffer, unused, unused2);
 152 }
 153
 154 static void
 155 image_property_changed (pixman_image_t *image)
 156 {
 157     image->common.property_changed (image);
 158 }
 159
 160 /* Ref Counting */
 161 PIXMAN_EXPORT pixman_image_t *
 162 pixman_image_ref (pixman_image_t *image)
 163 {
 164     image->common.ref_count++;
 165
 166     return image;
 167 }
 168
 169 /* returns TRUE when the image is freed */
 170 PIXMAN_EXPORT pixman_bool_t
 171 pixman_image_unref (pixman_image_t *image)
 172 {
 173     image_common_t *common = (image_common_t *)image;
 174
 175     common->ref_count--;
 176
 177     if (common->ref_count == 0)
 178     {
 179         if (image->common.destroy_func)
 180             image->common.destroy_func (image, image->common.destroy_data);
 181
 182         pixman_region32_fini (&common->clip_region);
 183
 184         if (common->transform)
 185             free (common->transform);
 186
 187         if (common->filter_params)
 188             free (common->filter_params);
 189
 190         if (common->alpha_map)
 191             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 192
 193 #if 0
 194         if (image->type == BITS && image->bits.indexed)
 195             free (image->bits.indexed);
 196 #endif
 197
 198 #if 0
 199         memset (image, 0xaa, sizeof (pixman_image_t));
 200 #endif
 201         if (image->type == LINEAR || image->type == RADIAL || image->type == CONICAL)
 202         {
 203             if (image->gradient.stops)
 204                 free (image->gradient.stops);
 205         }
 206
 207
 208         if (image->type == BITS && image->bits.free_me)
 209             free (image->bits.free_me);
 210
 211         free (image);
 212
 213         return TRUE;
 214     }
 215
 216     return FALSE;
 217 }
 218
 219 PIXMAN_EXPORT void
 220 pixman_image_set_destroy_function (pixman_image_t *image,
 221                                    pixman_image_destroy_func_t func,
 222                                    void *data)
 223 {
 224     image->common.destroy_func = func;
 225     image->common.destroy_data = data;
 226 }
 227
 228
 229 /* Constructors */
 230
 231 void
 232 _pixman_image_reset_clip_region (pixman_image_t *image)
 233 {
 234     image->common.have_clip_region = FALSE;
 235 }
 236
 237 PIXMAN_EXPORT pixman_bool_t
 238 pixman_image_set_clip_region32 (pixman_image_t *image,
 239                                 pixman_region32_t *region)
 240 {
 241     image_common_t *common = (image_common_t *)image;
 242     pixman_bool_t result;
 243
 244     if (region)
 245     {
 246         if ((result = pixman_region32_copy (&common->clip_region, region)))
 247             image->common.have_clip_region = TRUE;
 248     }
 249     else
 250     {
 251         _pixman_image_reset_clip_region (image);
 252
 253         result = TRUE;
 254     }
 255
 256     image_property_changed (image);
 257
 258     return result;
 259 }
 260
 261
 262 PIXMAN_EXPORT pixman_bool_t
 263 pixman_image_set_clip_region (pixman_image_t    *image,
 264                               pixman_region16_t *region)
 265 {
 266     image_common_t *common = (image_common_t *)image;
 267     pixman_bool_t result;
 268
 269     if (region)
 270     {
 271         if ((result = pixman_region32_copy_from_region16 (&common->clip_region, region)))
 272             image->common.have_clip_region = TRUE;
 273     }
 274     else
 275     {
 276         _pixman_image_reset_clip_region (image);
 277
 278         result = TRUE;
 279     }
 280
 281     image_property_changed (image);
 282
 283     return result;
 284 }
 285
 286 PIXMAN_EXPORT void
 287 pixman_image_set_has_client_clip (pixman_image_t *image,
 288                                   pixman_bool_t   client_clip)
 289 {
 290     image->common.client_clip = client_clip;
 291 }
 292
 293 PIXMAN_EXPORT pixman_bool_t
 294 pixman_image_set_transform (pixman_image_t           *image,
 295                             const pixman_transform_t *transform)
 296 {
 297     static const pixman_transform_t id =
 298     {
 299         { { pixman_fixed_1, 0, 0 },
 300           { 0, pixman_fixed_1, 0 },
 301           { 0, 0, pixman_fixed_1 }
 302         }
 303     };
 304
 305     image_common_t *common = (image_common_t *)image;
 306     pixman_bool_t result;
 307
 308     if (common->transform == transform)
 309         return TRUE;
 310
 311     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
 312     {
 313         free(common->transform);
 314         common->transform = NULL;
 315         result = TRUE;
 316         goto out;
 317     }
 318
 319     if (common->transform == NULL)
 320         common->transform = malloc (sizeof (pixman_transform_t));
 321
 322     if (common->transform == NULL)
 323     {
 324         result = FALSE;
 325         goto out;
 326     }
 327
 328     memcpy(common->transform, transform, sizeof(pixman_transform_t));
 329
 330 out:
 331     image_property_changed (image);
 332
 333     return TRUE;
 334 }
 335
 336 PIXMAN_EXPORT void
 337 pixman_image_set_repeat (pixman_image_t  *image,
 338                          pixman_repeat_t  repeat)
 339 {
 340     image->common.repeat = repeat;
 341
 342     image_property_changed (image);
 343 }
 344
 345 PIXMAN_EXPORT pixman_bool_t
 346 pixman_image_set_filter (pixman_image_t       *image,
 347                          pixman_filter_t       filter,
 348                          const pixman_fixed_t *params,
 349                          int                   n_params)
 350 {
 351     image_common_t *common = (image_common_t *)image;
 352     pixman_fixed_t *new_params;
 353
 354     if (params == common->filter_params && filter == common->filter)
 355         return TRUE;
 356
 357     new_params = NULL;
 358     if (params)
 359     {
 360         new_params = pixman_malloc_ab (n_params, sizeof (pixman_fixed_t));
 361         if (!new_params)
 362             return FALSE;
 363
 364         memcpy (new_params,
 365                 params, n_params * sizeof (pixman_fixed_t));
 366     }
 367
 368     common->filter = filter;
 369
 370     if (common->filter_params)
 371         free (common->filter_params);
 372
 373     common->filter_params = new_params;
 374     common->n_filter_params = n_params;
 375
 376     image_property_changed (image);
 377     return TRUE;
 378 }
 379
 380 PIXMAN_EXPORT void
 381 pixman_image_set_source_clipping (pixman_image_t  *image,
 382                                   pixman_bool_t    clip_sources)
 383 {
 384     image->common.clip_sources = clip_sources;
 385 }
 386
 387 /* Unlike all the other property setters, this function does not
 388  * copy the content of indexed. Doing this copying is simply
 389  * way, way too expensive.
 390  */
 391 PIXMAN_EXPORT void
 392 pixman_image_set_indexed (pixman_image_t         *image,
 393                           const pixman_indexed_t *indexed)
 394 {
 395     bits_image_t *bits = (bits_image_t *)image;
 396
 397     bits->indexed = indexed;
 398
 399     image_property_changed (image);
 400 }
 401
 402 PIXMAN_EXPORT void
 403 pixman_image_set_alpha_map (pixman_image_t *image,
 404                             pixman_image_t *alpha_map,
 405                             int16_t         x,
 406                             int16_t         y)
 407 {
 408     image_common_t *common = (image_common_t *)image;
 409
 410     return_if_fail (!alpha_map || alpha_map->type == BITS);
 411
 412     if (common->alpha_map != (bits_image_t *)alpha_map)
 413     {
 414         if (common->alpha_map)
 415             pixman_image_unref ((pixman_image_t *)common->alpha_map);
 416
 417         if (alpha_map)
 418             common->alpha_map = (bits_image_t *)pixman_image_ref (alpha_map);
 419         else
 420             common->alpha_map = NULL;
 421     }
 422
 423     common->alpha_origin_x = x;
 424     common->alpha_origin_y = y;
 425
 426     image_property_changed (image);
 427 }
 428
 429 PIXMAN_EXPORT void
 430 pixman_image_set_component_alpha   (pixman_image_t       *image,
 431                                     pixman_bool_t         component_alpha)
 432 {
 433     image->common.component_alpha = component_alpha;
 434
 435     image_property_changed (image);
 436 }
 437
 438
 439 PIXMAN_EXPORT void
 440 pixman_image_set_accessors (pixman_image_t             *image,
 441                             pixman_read_memory_func_t   read_func,
 442                             pixman_write_memory_func_t  write_func)
 443 {
 444     return_if_fail (image != NULL);
 445
 446     image->common.read_func = read_func;
 447     image->common.write_func = write_func;
 448
 449     image_property_changed (image);
 450 }
 451
 452 PIXMAN_EXPORT uint32_t *
 453 pixman_image_get_data (pixman_image_t *image)
 454 {
 455     if (image->type == BITS)
 456         return image->bits.bits;
 457
 458     return NULL;
 459 }
 460
 461 PIXMAN_EXPORT int
 462 pixman_image_get_width (pixman_image_t *image)
 463 {
 464     if (image->type == BITS)
 465         return image->bits.width;
 466
 467     return 0;
 468 }
 469
 470 PIXMAN_EXPORT int
 471 pixman_image_get_height (pixman_image_t *image)
 472 {
 473     if (image->type == BITS)
 474         return image->bits.height;
 475
 476     return 0;
 477 }
 478
 479 PIXMAN_EXPORT int
 480 pixman_image_get_stride (pixman_image_t *image)
 481 {
 482     if (image->type == BITS)
 483         return image->bits.rowstride * (int) sizeof (uint32_t);
 484
 485     return 0;
 486 }
 487
 488 PIXMAN_EXPORT int
 489 pixman_image_get_depth (pixman_image_t *image)
 490 {
 491     if (image->type == BITS)
 492         return PIXMAN_FORMAT_DEPTH (image->bits.format);
 493
 494     return 0;
 495 }
 496
 497 pixman_bool_t
 498 _pixman_image_is_solid (pixman_image_t *image)
 499 {
 500     if (image->type == SOLID)
 501         return TRUE;
 502
 503     if (image->type != BITS     ||
 504         image->bits.width != 1  ||
 505         image->bits.height != 1)
 506     {
 507         return FALSE;
 508     }
 509
 510     if (image->common.repeat == PIXMAN_REPEAT_NONE)
 511         return FALSE;
 512
 513     return TRUE;
 514 }
 515
 516 uint32_t
 517 _pixman_image_get_solid (pixman_image_t *image, pixman_format_code_t format)
 518 {
 519     uint32_t result;
 520
 521     _pixman_image_get_scanline_32 (image, 0, 0, 1, &result, NULL, 0);
 522
 523     /* If necessary, convert RGB <--> BGR. */
 524     if (PIXMAN_FORMAT_TYPE (format) != PIXMAN_TYPE_ARGB)
 525     {
 526         result = (((result & 0xff000000) >>  0) |
 527                   ((result & 0x00ff0000) >> 16) |
 528                   ((result & 0x0000ff00) >>  0) |
 529                   ((result & 0x000000ff) << 16));
 530     }
 531
 532     return result;
 533 }
 534
 535 pixman_bool_t
 536 _pixman_image_is_opaque (pixman_image_t *image)
 537 {
 538     int i;
 539
 540     if (image->common.alpha_map)
 541         return FALSE;
 542
 543     switch (image->type)
 544     {
 545     case BITS:
 546         if (image->common.repeat == PIXMAN_REPEAT_NONE)
 547             return FALSE;
 548
 549         if (PIXMAN_FORMAT_A (image->bits.format))
 550             return FALSE;
 551         break;
 552
 553     case LINEAR:
 554     case RADIAL:
 555         if (image->common.repeat == PIXMAN_REPEAT_NONE)
 556             return FALSE;
 557
 558         for (i = 0; i < image->gradient.n_stops; ++i)
 559         {
 560             if (image->gradient.stops[i].color.alpha != 0xffff)
 561                 return FALSE;
 562         }
 563         break;
 564
 565     case CONICAL:
 566         /* Conical gradients always have a transparent border */
 567         return FALSE;
 568         break;
 569
 570     case SOLID:
 571         if (Alpha (image->solid.color) != 0xff)
 572             return FALSE;
 573         break;
 574     }
 575
 576     /* Convolution filters can introduce translucency if the sum of the
 577      * weights is lower than 1.
 578      */
 579     if (image->common.filter == PIXMAN_FILTER_CONVOLUTION)
 580          return FALSE;
 581
 582      return TRUE;
 583 }