summaryrefslogtreecommitdiff
path: root/src/gallium/state_trackers/vega/image.c
blob: 4684a5727dda98d0267b13e4cf810b8b0e263d55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "image.h"

#include "vg_translate.h"
#include "vg_context.h"
#include "matrix.h"
#include "renderer.h"
#include "util_array.h"
#include "api_consts.h"
#include "shaders_cache.h"
#include "shader.h"

#include "pipe/p_context.h"
#include "pipe/p_screen.h"
#include "pipe/p_inlines.h"
#include "util/u_blit.h"
#include "util/u_tile.h"
#include "util/u_memory.h"
#include "util/u_math.h"

static enum pipe_format vg_format_to_pipe(VGImageFormat format)
{
   switch(format) {
   case VG_sRGB_565:
      return PIPE_FORMAT_R5G6B5_UNORM;
   case VG_sRGBA_5551:
      return PIPE_FORMAT_A1R5G5B5_UNORM;
   case VG_sRGBA_4444:
      return PIPE_FORMAT_A4R4G4B4_UNORM;
   case VG_sL_8:
   case VG_lL_8:
      return PIPE_FORMAT_L8_UNORM;
   case VG_BW_1:
      return PIPE_FORMAT_A8R8G8B8_UNORM;
   case VG_A_8:
      return PIPE_FORMAT_A8_UNORM;
#ifdef OPENVG_VERSION_1_1
   case VG_A_1:
   case VG_A_4:
      return PIPE_FORMAT_A8_UNORM;
#endif
   default:
      return PIPE_FORMAT_A8R8G8B8_UNORM;
   }
}

static INLINE void vg_sync_size(VGfloat *src_loc, VGfloat *dst_loc)
{
   src_loc[2] = MIN2(src_loc[2], dst_loc[2]);
   src_loc[3] = MIN2(src_loc[3], dst_loc[3]);
   dst_loc[2] = src_loc[2];
   dst_loc[3] = src_loc[3];
}


static void vg_copy_texture(struct vg_context *ctx,
                            struct pipe_texture *dst, VGint dx, VGint dy,
                            struct pipe_texture *src, VGint sx, VGint sy,
                            VGint width, VGint height)
{
   VGfloat dst_loc[4], src_loc[4];
   VGfloat dst_bounds[4], src_bounds[4];
   VGfloat src_shift[4], dst_shift[4], shift[4];

   dst_loc[0] = dx;
   dst_loc[1] = dy;
   dst_loc[2] = width;
   dst_loc[3] = height;
   dst_bounds[0] = 0.f;
   dst_bounds[1] = 0.f;
   dst_bounds[2] = dst->width0;
   dst_bounds[3] = dst->height0;

   src_loc[0] = sx;
   src_loc[1] = sy;
   src_loc[2] = width;
   src_loc[3] = height;
   src_bounds[0] = 0.f;
   src_bounds[1] = 0.f;
   src_bounds[2] = src->width0;
   src_bounds[3] = src->height0;

   vg_bound_rect(src_loc, src_bounds, src_shift);
   vg_bound_rect(dst_loc, dst_bounds, dst_shift);
   shift[0] = src_shift[0] - dst_shift[0];
   shift[1] = src_shift[1] - dst_shift[1];

   if (shift[0] < 0)
      vg_shift_rectx(src_loc, src_bounds, -shift[0]);
   else
      vg_shift_rectx(dst_loc, dst_bounds, shift[0]);

   if (shift[1] < 0)
      vg_shift_recty(src_loc, src_bounds, -shift[1]);
   else
      vg_shift_recty(dst_loc, dst_bounds, shift[1]);

   vg_sync_size(src_loc, dst_loc);

   if (src_loc[2] >= 0 && src_loc[3] >= 0 &&
       dst_loc[2] >= 0 && dst_loc[3] >= 0) {
      renderer_copy_texture(ctx->renderer,
                            src,
                            src_loc[0],
                            src_loc[1] + src_loc[3],
                            src_loc[0] + src_loc[2],
                            src_loc[1],
                            dst,
                            dst_loc[0],
                            dst_loc[1] + dst_loc[3],
                            dst_loc[0] + dst_loc[2],
                            dst_loc[1]);
   }

}

void vg_copy_surface(struct vg_context *ctx,
                     struct pipe_surface *dst, VGint dx, VGint dy,
                     struct pipe_surface *src, VGint sx, VGint sy,
                     VGint width, VGint height)
{
   VGfloat dst_loc[4], src_loc[4];
   VGfloat dst_bounds[4], src_bounds[4];
   VGfloat src_shift[4], dst_shift[4], shift[4];

   dst_loc[0] = dx;
   dst_loc[1] = dy;
   dst_loc[2] = width;
   dst_loc[3] = height;
   dst_bounds[0] = 0.f;
   dst_bounds[1] = 0.f;
   dst_bounds[2] = dst->width;
   dst_bounds[3] = dst->height;

   src_loc[0] = sx;
   src_loc[1] = sy;
   src_loc[2] = width;
   src_loc[3] = height;
   src_bounds[0] = 0.f;
   src_bounds[1] = 0.f;
   src_bounds[2] = src->width;
   src_bounds[3] = src->height;

   vg_bound_rect(src_loc, src_bounds, src_shift);
   vg_bound_rect(dst_loc, dst_bounds, dst_shift);
   shift[0] = src_shift[0] - dst_shift[0];
   shift[1] = src_shift[1] - dst_shift[1];

   if (shift[0] < 0)
      vg_shift_rectx(src_loc, src_bounds, -shift[0]);
   else
      vg_shift_rectx(dst_loc, dst_bounds, shift[0]);

   if (shift[1] < 0)
      vg_shift_recty(src_loc, src_bounds, -shift[1]);
   else
      vg_shift_recty(dst_loc, dst_bounds, shift[1]);

   vg_sync_size(src_loc, dst_loc);

   if (src_loc[2] > 0 && src_loc[3] > 0 &&
       dst_loc[2] > 0 && dst_loc[3] > 0) {
      if (src == dst)
         renderer_copy_surface(ctx->renderer,
                               src,
                               src_loc[0],
                               src->height - (src_loc[1] + src_loc[3]),
                               src_loc[0] + src_loc[2],
                               src->height - src_loc[1],
                               dst,
                               dst_loc[0],
                               dst->height - (dst_loc[1] + dst_loc[3]),
                               dst_loc[0] + dst_loc[2],
                               dst->height - dst_loc[1],
                               0, 0);
      else
         renderer_copy_surface(ctx->renderer,
                               src,
                               src_loc[0],
                               src->height - src_loc[1],
                               src_loc[0] + src_loc[2],
                               src->height - (src_loc[1] + src_loc[3]),
                               dst,
                               dst_loc[0],
                               dst->height - (dst_loc[1] + dst_loc[3]),
                               dst_loc[0] + dst_loc[2],
                               dst->height - dst_loc[1],
                               0, 0);
   }

}

static struct pipe_texture *image_texture(struct vg_image *img)
{
   struct pipe_texture *tex = img->texture;
   return tex;
}


static void image_cleari(struct vg_image *img, VGint clear_colori,
                         VGint x, VGint y, VGint width, VGint height)
{
   VGint *clearbuf;
   VGint i;
   VGfloat dwidth, dheight;

   clearbuf = malloc(sizeof(VGint)*width*height);
   for (i = 0; i < width*height; ++i)
      clearbuf[i] = clear_colori;

   dwidth = MIN2(width, img->width);
   dheight = MIN2(height, img->height);

   image_sub_data(img, clearbuf, width * sizeof(VGint),
                  VG_sRGBA_8888,
                  x, y, dwidth, dheight);
   free(clearbuf);
}

struct vg_image * image_create(VGImageFormat format,
                               VGint width, VGint height)
{
   struct vg_context *ctx = vg_current_context();
   struct vg_image *image = CALLOC_STRUCT(vg_image);
   enum pipe_format pformat = vg_format_to_pipe(format);
   struct pipe_texture pt, *newtex;
   struct pipe_screen *screen = ctx->pipe->screen;

   vg_init_object(&image->base, ctx, VG_OBJECT_IMAGE);

   image->format = format;
   image->width = width;
   image->height = height;

   image->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   image->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   image->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   image->sampler.min_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
   image->sampler.mag_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
   image->sampler.normalized_coords = 1;

   assert(screen->is_format_supported(screen, pformat, PIPE_TEXTURE_2D,
                                      PIPE_TEXTURE_USAGE_SAMPLER, 0));

   memset(&pt, 0, sizeof(pt));
   pt.target = PIPE_TEXTURE_2D;
   pt.format = pformat;
   pf_get_block(pformat, &pt.block);
   pt.last_level = 0;
   pt.width0 = width;
   pt.height0 = height;
   pt.depth0 = 1;
   pt.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER;

   newtex = screen->texture_create(screen, &pt);

   debug_assert(newtex);

   image->texture = newtex;

   vg_context_add_object(ctx, VG_OBJECT_IMAGE, image);

   image_cleari(image, 0, 0, 0, image->width, image->height);
   return image;
}

void image_destroy(struct vg_image *img)
{
   struct vg_context *ctx = vg_current_context();
   vg_context_remove_object(ctx, VG_OBJECT_IMAGE, img);


   if (img->parent) {
      /* remove img from the parent child array */
      int idx;
      struct vg_image **array =
         (struct vg_image **)img->parent->children_array->data;

      for (idx = 0; idx < img->parent->children_array->num_elements; ++idx) {
         struct vg_image *child = array[idx];
         if (child == img) {
            break;
         }
      }
      debug_assert(idx < img->parent->children_array->num_elements);
      array_remove_element(img->parent->children_array, idx);
   }

   if (img->children_array && img->children_array->num_elements) {
      /* reparent the children */
      VGint i;
      struct vg_image *parent = img->parent;
      struct vg_image **children =
         (struct vg_image **)img->children_array->data;
      if (!parent) {
         VGint min_x = children[0]->x;
         parent = children[0];

         for (i = 1; i < img->children_array->num_elements; ++i) {
            struct vg_image *child = children[i];
            if (child->x < min_x) {
               parent = child;
            }
         }
      }

      for (i = 0; i < img->children_array->num_elements; ++i) {
         struct vg_image *child = children[i];
         if (child != parent) {
            child->parent = parent;
            if (!parent->children_array) {
               parent->children_array = array_create(
                  sizeof(struct vg_image*));
            }
            array_append_data(parent->children_array,
                              &child, 1);
         } else
            child->parent = NULL;
      }
      array_destroy(img->children_array);
   }

   pipe_texture_reference(&img->texture, NULL);
   free(img);
}

void image_clear(struct vg_image *img,
                 VGint x, VGint y, VGint width, VGint height)
{
   struct vg_context *ctx = vg_current_context();
   VGfloat *clear_colorf = ctx->state.vg.clear_color;
   VGubyte r, g, b ,a;
   VGint clear_colori;
   /* FIXME: this is very nasty */
   r = float_to_ubyte(clear_colorf[0]);
   g = float_to_ubyte(clear_colorf[1]);
   b = float_to_ubyte(clear_colorf[2]);
   a = float_to_ubyte(clear_colorf[3]);
   clear_colori = r << 24 | g << 16 | b << 8 | a;
   image_cleari(img, clear_colori, x, y, width, height);
}

void image_sub_data(struct vg_image *image,
                    const void * data,
                    VGint dataStride,
                    VGImageFormat dataFormat,
                    VGint x, VGint y,
                    VGint width, VGint height)
{
   const VGint yStep = 1;
   VGubyte *src = (VGubyte *)data;
   VGfloat temp[VEGA_MAX_IMAGE_WIDTH][4];
   VGfloat *df = (VGfloat*)temp;
   VGint i;
   struct vg_context *ctx = vg_current_context();
   struct pipe_screen *screen = ctx->pipe->screen;
   struct pipe_texture *texture = image_texture(image);
   VGint xoffset = 0, yoffset = 0;

   if (x < 0) {
      xoffset -= x;
      width += x;
      x = 0;
   }
   if (y < 0) {
      yoffset -= y;
      height += y;
      y = 0;
   }

   if (width <= 0 || height <= 0) {
      vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
      return;
   }

   if (x > image->width || y > image->width) {
      vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
      return;
   }

   if (x + width > image->width) {
      width = image->width - x;
   }

   if (y + height > image->height) {
      height = image->height - y;
   }

   { /* upload color_data */
      struct pipe_transfer *transfer = screen->get_tex_transfer(
         screen, texture, 0, 0, 0,
         PIPE_TRANSFER_WRITE, 0, 0, texture->width0, texture->height0);
      src += (dataStride * yoffset);
      for (i = 0; i < height; i++) {
         _vega_unpack_float_span_rgba(ctx, width, xoffset, src, dataFormat, temp);
         pipe_put_tile_rgba(transfer, x+image->x, y+image->y, width, 1, df);
         y += yStep;
         src += dataStride;
      }
      screen->tex_transfer_destroy(transfer);
   }
}

void image_get_sub_data(struct vg_image * image,
                        void * data,
                        VGint dataStride,
                        VGImageFormat dataFormat,
                        VGint sx, VGint sy,
                        VGint width, VGint height)
{
   struct vg_context *ctx = vg_current_context();
   struct pipe_context *pipe = ctx->pipe;
   struct pipe_screen *screen = pipe->screen;
   VGfloat temp[VEGA_MAX_IMAGE_WIDTH][4];
   VGfloat *df = (VGfloat*)temp;
   VGint y = 0, yStep = 1;
   VGint i;
   VGubyte *dst = (VGubyte *)data;

   {
      struct pipe_transfer *transfer =
         screen->get_tex_transfer(screen,
                                  image->texture,  0, 0, 0,
                                  PIPE_TRANSFER_READ,
                                  0, 0,
                                  image->x + image->width,
                                  image->y + image->height);
      /* Do a row at a time to flip image data vertically */
      for (i = 0; i < height; i++) {
#if 0
         debug_printf("%d-%d  == %d\n", sy, height, y);
#endif
         pipe_get_tile_rgba(transfer, sx+image->x, y, width, 1, df);
         y += yStep;
         _vega_pack_rgba_span_float(ctx, width, temp, dataFormat, dst);
         dst += dataStride;
      }

      screen->tex_transfer_destroy(transfer);
   }
}

struct vg_image * image_child_image(struct vg_image *parent,
                                    VGint x, VGint y,
                                    VGint width, VGint height)
{
   struct vg_context *ctx = vg_current_context();
   struct vg_image *image = CALLOC_STRUCT(vg_image);

   vg_init_object(&image->base, ctx, VG_OBJECT_IMAGE);

   image->x = parent->x + x;
   image->y = parent->y + y;
   image->width = width;
   image->height = height;
   image->parent = parent;
   image->texture = 0;
   pipe_texture_reference(&image->texture,
                          parent->texture);

   image->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   image->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   image->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   image->sampler.min_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
   image->sampler.mag_img_filter = PIPE_TEX_MIPFILTER_NEAREST;
   image->sampler.normalized_coords = 1;

   if (!parent->children_array)
      parent->children_array = array_create(
         sizeof(struct vg_image*));

   array_append_data(parent->children_array,
                     &image, 1);

   vg_context_add_object(ctx, VG_OBJECT_IMAGE, image);

   return image;
}

void image_copy(struct vg_image *dst, VGint dx, VGint dy,
                struct vg_image *src, VGint sx, VGint sy,
                VGint width, VGint height,
                VGboolean dither)
{
   struct vg_context *ctx = vg_current_context();

   if (width <= 0 || height <= 0) {
      vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
      return;
   }
   /* make sure rendering has completed */
   ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
   vg_copy_texture(ctx, dst->texture, dst->x + dx, dst->y + dy,
                   src->texture, src->x + sx, src->y + sy, width, height);
}

void image_draw(struct vg_image *img)
{
   struct vg_context *ctx = vg_current_context();
   VGfloat x1, y1;
   VGfloat x2, y2;
   VGfloat x3, y3;
   VGfloat x4, y4;
   struct matrix *matrix;

   x1 = 0;
   y1 = 0;
   x2 = img->width;
   y2 = 0;
   x3 = img->width;
   y3 = img->height;
   x4 = 0;
   y4 = img->height;

   matrix = &ctx->state.vg.image_user_to_surface_matrix;

   matrix_map_point(matrix, x1, y1, &x1, &y1);
   matrix_map_point(matrix, x2, y2, &x2, &y2);
   matrix_map_point(matrix, x3, y3, &x3, &y3);
   matrix_map_point(matrix, x4, y4, &x4, &y4);

   shader_set_drawing_image(ctx->shader, VG_TRUE);
   shader_set_paint(ctx->shader, ctx->state.vg.fill_paint);
   shader_set_image(ctx->shader, img);
   shader_bind(ctx->shader);

   renderer_texture_quad(ctx->renderer, image_texture(img),
                         img->x, img->y, img->x + img->width, img->y + img->height,
                         x1, y1, x2, y2, x3, y3, x4, y4);
}

void image_set_pixels(VGint dx, VGint dy,
                      struct vg_image *src, VGint sx, VGint sy,
                      VGint width, VGint height)
{
   struct vg_context *ctx = vg_current_context();
   struct pipe_context *pipe = ctx->pipe;
   struct pipe_screen *screen = pipe->screen;
   struct pipe_surface *surf;
   struct st_renderbuffer *strb = ctx->draw_buffer->strb;

   /* make sure rendering has completed */
   pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);

   surf = screen->get_tex_surface(screen, image_texture(src),  0, 0, 0,
                                  PIPE_BUFFER_USAGE_GPU_READ);

   vg_copy_surface(ctx, strb->surface, dx, dy,
                   surf, sx+src->x, sy+src->y, width, height);

   screen->tex_surface_destroy(surf);
}

void image_get_pixels(struct vg_image *dst, VGint dx, VGint dy,
                      VGint sx, VGint sy,
                      VGint width, VGint height)
{
   struct vg_context *ctx = vg_current_context();
   struct pipe_context *pipe = ctx->pipe;
   struct pipe_screen *screen = pipe->screen;
   struct pipe_surface *surf;
   struct st_renderbuffer *strb = ctx->draw_buffer->strb;

   /* flip the y coordinates */
   /*dy = dst->height - dy - height;*/

   /* make sure rendering has completed */
   pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);

   surf = screen->get_tex_surface(screen, image_texture(dst),  0, 0, 0,
                                  PIPE_BUFFER_USAGE_GPU_WRITE |
                                  PIPE_BUFFER_USAGE_GPU_READ);
   vg_copy_surface(ctx, surf, dst->x + dx, dst->y + dy,
                   strb->surface, sx, sy, width, height);

   pipe_surface_reference(&surf, NULL);
}


VGboolean vg_image_overlaps(struct vg_image *dst,
                            struct vg_image *src)
{
   if (dst == src || dst->parent == src ||
       dst == src->parent)
      return VG_TRUE;
   if (dst->parent && dst->parent == src->parent) {
      VGfloat left1 = dst->x;
      VGfloat left2 = src->x;
      VGfloat right1 = dst->x + dst->width;
      VGfloat right2 = src->x + src->width;
      VGfloat bottom1 = dst->y;
      VGfloat bottom2 = src->y;
      VGfloat top1 = dst->y + dst->height;
      VGfloat top2 = src->y + src->height;

      return !(left2 > right1 || right2 < left1 ||
               top2 > bottom1 || bottom2 < top1);
   }
   return VG_FALSE;
}

VGint image_bind_samplers(struct vg_image *img, struct pipe_sampler_state **samplers,
                          struct pipe_texture **textures)
{
   img->sampler.min_img_filter = image_sampler_filter(img->base.ctx);
   img->sampler.mag_img_filter = image_sampler_filter(img->base.ctx);
   samplers[3] = &img->sampler;
   textures[3] = img->texture;
   return 1;
}

VGint image_sampler_filter(struct vg_context *ctx)
{
    switch(ctx->state.vg.image_quality) {
    case VG_IMAGE_QUALITY_NONANTIALIASED:
       return PIPE_TEX_FILTER_NEAREST;
       break;
    case VG_IMAGE_QUALITY_FASTER:
       return PIPE_TEX_FILTER_NEAREST;
       break;
    case VG_IMAGE_QUALITY_BETTER:
       /*return PIPE_TEX_FILTER_ANISO;*/
       return PIPE_TEX_FILTER_LINEAR;
       break;
    default:
       debug_printf("Unknown image quality");
    }
    return PIPE_TEX_FILTER_NEAREST;
}