src/gallium/state_trackers/vega/mask.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.  All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27 #include "mask.h"
  28
  29 #include "path.h"
  30 #include "image.h"
  31 #include "shaders_cache.h"
  32 #include "renderer.h"
  33 #include "asm_util.h"
  34 #include "st_inlines.h"
  35
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_screen.h"
  38 #include "util/u_inlines.h"
  39 #include "util/u_format.h"
  40 #include "util/u_memory.h"
  41
  42 struct vg_mask_layer {
  43    struct vg_object base;
  44
  45    VGint width;
  46    VGint height;
  47
  48    struct pipe_sampler_view *sampler_view;
  49 };
  50
  51 static INLINE struct pipe_surface *
  52 alpha_mask_surface(struct vg_context *ctx, int usage)
  53 {
  54    struct pipe_screen *screen = ctx->pipe->screen;
  55    struct st_framebuffer *stfb = ctx->draw_buffer;
  56    return screen->get_tex_surface(screen,
  57                                   stfb->alpha_mask_view->texture,
  58                                   0, 0, 0,
  59                                   usage);
  60 }
  61
  62 static INLINE VGboolean
  63 intersect_rectangles(VGint dwidth, VGint dheight,
  64                      VGint swidth, VGint sheight,
  65                      VGint tx, VGint ty,
  66                      VGint twidth, VGint theight,
  67                      VGint *offsets,
  68                      VGint *location)
  69 {
  70    if (tx + twidth <= 0 || tx >= dwidth)
  71       return VG_FALSE;
  72    if (ty + theight <= 0 || ty >= dheight)
  73       return VG_FALSE;
  74
  75    offsets[0] = 0;
  76    offsets[1] = 0;
  77    location[0] = tx;
  78    location[1] = ty;
  79
  80    if (tx < 0) {
  81       offsets[0] -= tx;
  82       location[0] = 0;
  83
  84       location[2] = MIN2(tx + swidth, MIN2(dwidth, tx + twidth));
  85       offsets[2] = location[2];
  86    } else {
  87       offsets[2] = MIN2(twidth, MIN2(dwidth - tx, swidth ));
  88       location[2] = offsets[2];
  89    }
  90
  91    if (ty < 0) {
  92       offsets[1] -= ty;
  93       location[1] = 0;
  94
  95       location[3] = MIN2(ty + sheight, MIN2(dheight, ty + theight));
  96       offsets[3] = location[3];
  97    } else {
  98       offsets[3] = MIN2(theight, MIN2(dheight - ty, sheight));
  99       location[3] = offsets[3];
 100    }
 101
 102    return VG_TRUE;
 103 }
 104
 105 #if DEBUG_MASKS
 106 static void read_alpha_mask(void * data, VGint dataStride,
 107                             VGImageFormat dataFormat,
 108                             VGint sx, VGint sy,
 109                             VGint width, VGint height)
 110 {
 111    struct vg_context *ctx = vg_current_context();
 112    struct pipe_context *pipe = ctx->pipe;
 113    struct pipe_screen *screen = pipe->screen;
 114
 115    struct st_framebuffer *stfb = ctx->draw_buffer;
 116    struct st_renderbuffer *strb = stfb->alpha_mask;
 117    struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 118
 119    VGfloat temp[VEGA_MAX_IMAGE_WIDTH][4];
 120    VGfloat *df = (VGfloat*)temp;
 121    VGint y = (fb->height - sy) - 1, yStep = -1;
 122    VGint i;
 123    VGubyte *dst = (VGubyte *)data;
 124    VGint xoffset = 0, yoffset = 0;
 125
 126    /* make sure rendering has completed */
 127    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 128    if (sx < 0) {
 129       xoffset = -sx;
 130       xoffset *= _vega_size_for_format(dataFormat);
 131       width += sx;
 132       sx = 0;
 133    }
 134    if (sy < 0) {
 135       yoffset = -sy;
 136       height += sy;
 137       sy = 0;
 138       y = (fb->height - sy) - 1;
 139       yoffset *= dataStride;
 140    }
 141
 142    {
 143       struct pipe_surface *surf;
 144
 145       surf = screen->get_tex_surface(screen, strb->texture,  0, 0, 0,
 146                                      PIPE_BUFFER_USAGE_CPU_READ);
 147
 148       /* Do a row at a time to flip image data vertically */
 149       for (i = 0; i < height; i++) {
 150 #if 0
 151          debug_printf("%d-%d  == %d\n", sy, height, y);
 152 #endif
 153          pipe_get_tile_rgba(surf, sx, y, width, 1, df);
 154          y += yStep;
 155          _vega_pack_rgba_span_float(ctx, width, temp, dataFormat,
 156                                     dst + yoffset + xoffset);
 157          dst += dataStride;
 158       }
 159
 160       pipe_surface_reference(&surf, NULL);
 161    }
 162 }
 163
 164 void save_alpha_to_file(const char *filename)
 165 {
 166    struct vg_context *ctx = vg_current_context();
 167    struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
 168    VGint *data;
 169    int i, j;
 170
 171    data = malloc(sizeof(int) * fb->width * fb->height);
 172    read_alpha_mask(data, fb->width * sizeof(int),
 173                    VG_sRGBA_8888,
 174                    0, 0, fb->width, fb->height);
 175    fprintf(stderr, "/*---------- start */\n");
 176    fprintf(stderr, "const int image_width = %d;\n",
 177            fb->width);
 178    fprintf(stderr, "const int image_height = %d;\n",
 179            fb->height);
 180    fprintf(stderr, "const int image_data = {\n");
 181    for (i = 0; i < fb->height; ++i) {
 182       for (j = 0; j < fb->width; ++j) {
 183          int rgba = data[i * fb->height + j];
 184          int argb = 0;
 185          argb = (rgba >> 8);
 186          argb |= ((rgba & 0xff) << 24);
 187          fprintf(stderr, "0x%x, ", argb);
 188       }
 189       fprintf(stderr, "\n");
 190    }
 191    fprintf(stderr, "};\n");
 192    fprintf(stderr, "/*---------- end */\n");
 193 }
 194 #endif
 195
 196 static void setup_mask_framebuffer(struct pipe_surface *surf,
 197                                    VGint surf_width, VGint surf_height)
 198 {
 199    struct vg_context *ctx = vg_current_context();
 200    struct pipe_framebuffer_state fb;
 201
 202    memset(&fb, 0, sizeof(fb));
 203    fb.width = surf_width;
 204    fb.height = surf_height;
 205    fb.nr_cbufs = 1;
 206    fb.cbufs[0] = surf;
 207    {
 208       VGint i;
 209       for (i = 1; i < PIPE_MAX_COLOR_BUFS; ++i)
 210          fb.cbufs[i] = 0;
 211    }
 212    cso_set_framebuffer(ctx->cso_context, &fb);
 213 }
 214
 215
 216 /* setup shader constants */
 217 static void setup_mask_operation(VGMaskOperation operation)
 218 {
 219    struct vg_context *ctx = vg_current_context();
 220    struct pipe_buffer **cbuf = &ctx->mask.cbuf;
 221    const VGint param_bytes = 4 * sizeof(VGfloat);
 222    const VGfloat ones[4] = {1.f, 1.f, 1.f, 1.f};
 223    void *shader = 0;
 224
 225    /* We always need to get a new buffer, to keep the drivers simple and
 226     * avoid gratuitous rendering synchronization.
 227     */
 228    pipe_buffer_reference(cbuf, NULL);
 229
 230    *cbuf = pipe_buffer_create(ctx->pipe->screen, 1,
 231                               PIPE_BUFFER_USAGE_CONSTANT,
 232                               param_bytes);
 233    if (*cbuf) {
 234       st_no_flush_pipe_buffer_write(ctx, *cbuf,
 235                                     0, param_bytes, ones);
 236    }
 237
 238    ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, *cbuf);
 239    switch (operation) {
 240    case VG_UNION_MASK: {
 241       if (!ctx->mask.union_fs) {
 242          ctx->mask.union_fs = shader_create_from_text(ctx->pipe,
 243                                                       union_mask_asm,
 244                                                       200,
 245                                                       PIPE_SHADER_FRAGMENT);
 246       }
 247       shader = ctx->mask.union_fs->driver;
 248    }
 249       break;
 250    case VG_INTERSECT_MASK: {
 251       if (!ctx->mask.intersect_fs) {
 252          ctx->mask.intersect_fs = shader_create_from_text(ctx->pipe,
 253                                                           intersect_mask_asm,
 254                                                           200,
 255                                                           PIPE_SHADER_FRAGMENT);
 256       }
 257       shader = ctx->mask.intersect_fs->driver;
 258    }
 259       break;
 260    case VG_SUBTRACT_MASK: {
 261       if (!ctx->mask.subtract_fs) {
 262          ctx->mask.subtract_fs = shader_create_from_text(ctx->pipe,
 263                                                          subtract_mask_asm,
 264                                                          200,
 265                                                          PIPE_SHADER_FRAGMENT);
 266       }
 267       shader = ctx->mask.subtract_fs->driver;
 268    }
 269       break;
 270    case VG_SET_MASK: {
 271       if (!ctx->mask.set_fs) {
 272          ctx->mask.set_fs = shader_create_from_text(ctx->pipe,
 273                                                     set_mask_asm,
 274                                                     200,
 275                                                     PIPE_SHADER_FRAGMENT);
 276       }
 277       shader = ctx->mask.set_fs->driver;
 278    }
 279       break;
 280    default:
 281          assert(0);
 282       break;
 283    }
 284    cso_set_fragment_shader_handle(ctx->cso_context, shader);
 285 }
 286
 287 static void setup_mask_samplers(struct pipe_sampler_view *umask)
 288 {
 289    struct vg_context *ctx = vg_current_context();
 290    struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 291    struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 292    struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 293    struct pipe_sampler_view *uprev = NULL;
 294    struct pipe_sampler_state sampler;
 295
 296    uprev = fb_buffers->blend_texture_view;
 297    sampler = ctx->mask.sampler;
 298    sampler.normalized_coords = 1;
 299
 300    samplers[0] = NULL;
 301    samplers[1] = NULL;
 302    sampler_views[0] = NULL;
 303    sampler_views[1] = NULL;
 304
 305    samplers[0] = &sampler;
 306    samplers[1] = &ctx->mask.sampler;
 307
 308    sampler_views[0] = umask;
 309    sampler_views[1] = uprev;
 310
 311    cso_set_samplers(ctx->cso_context, 2,
 312                     (const struct pipe_sampler_state **)samplers);
 313    cso_set_fragment_sampler_views(ctx->cso_context, 2, sampler_views);
 314 }
 315
 316
 317 /* setup shader constants */
 318 static void setup_mask_fill(const VGfloat color[4])
 319 {
 320    struct vg_context *ctx = vg_current_context();
 321    struct pipe_buffer **cbuf = &ctx->mask.cbuf;
 322    const VGint param_bytes = 4 * sizeof(VGfloat);
 323
 324    /* We always need to get a new buffer, to keep the drivers simple and
 325     * avoid gratuitous rendering synchronization.
 326     */
 327    pipe_buffer_reference(cbuf, NULL);
 328
 329    *cbuf = pipe_buffer_create(ctx->pipe->screen, 1,
 330                               PIPE_BUFFER_USAGE_CONSTANT,
 331                               param_bytes);
 332    if (*cbuf) {
 333       st_no_flush_pipe_buffer_write(ctx, *cbuf, 0, param_bytes, color);
 334    }
 335
 336    ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, *cbuf);
 337    cso_set_fragment_shader_handle(ctx->cso_context,
 338                                   shaders_cache_fill(ctx->sc,
 339                                                      VEGA_SOLID_FILL_SHADER));
 340 }
 341
 342 static void setup_mask_viewport()
 343 {
 344    struct vg_context *ctx = vg_current_context();
 345    vg_set_viewport(ctx, VEGA_Y0_TOP);
 346 }
 347
 348 static void setup_mask_blend()
 349 {
 350    struct vg_context *ctx = vg_current_context();
 351
 352    struct pipe_blend_state blend;
 353
 354    memset(&blend, 0, sizeof(struct pipe_blend_state));
 355    blend.rt[0].blend_enable = 0;
 356    blend.rt[0].colormask = PIPE_MASK_RGBA;
 357    blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 358    blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 359    blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 360    blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 361
 362    cso_set_blend(ctx->cso_context, &blend);
 363 }
 364
 365
 366 static void surface_fill(struct pipe_surface *surf,
 367                          int surf_width, int surf_height,
 368                          int x, int y, int width, int height,
 369                          const VGfloat color[4])
 370 {
 371    struct vg_context *ctx = vg_current_context();
 372
 373    if (x < 0) {
 374       width += x;
 375       x = 0;
 376    }
 377    if (y < 0) {
 378       height += y;
 379       y = 0;
 380    }
 381
 382    cso_save_framebuffer(ctx->cso_context);
 383    cso_save_blend(ctx->cso_context);
 384    cso_save_fragment_shader(ctx->cso_context);
 385    cso_save_viewport(ctx->cso_context);
 386
 387    setup_mask_blend();
 388    setup_mask_fill(color);
 389    setup_mask_framebuffer(surf, surf_width, surf_height);
 390    setup_mask_viewport();
 391
 392    renderer_draw_quad(ctx->renderer, x, y,
 393                       x + width, y + height, 0.0f/*depth should be disabled*/);
 394
 395
 396    /* make sure rendering has completed */
 397    ctx->pipe->flush(ctx->pipe,
 398                     PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME,
 399                     NULL);
 400
 401 #if DEBUG_MASKS
 402    save_alpha_to_file(0);
 403 #endif
 404
 405    cso_restore_blend(ctx->cso_context);
 406    cso_restore_framebuffer(ctx->cso_context);
 407    cso_restore_fragment_shader(ctx->cso_context);
 408    cso_restore_viewport(ctx->cso_context);
 409 }
 410
 411
 412 static void mask_using_texture(struct pipe_sampler_view *sampler_view,
 413                                VGMaskOperation operation,
 414                                VGint x, VGint y,
 415                                VGint width, VGint height)
 416 {
 417    struct vg_context *ctx = vg_current_context();
 418    struct pipe_texture *texture = sampler_view->texture;
 419    struct pipe_surface *surface =
 420       alpha_mask_surface(ctx, PIPE_BUFFER_USAGE_GPU_WRITE);
 421    VGint offsets[4], loc[4];
 422
 423    if (!surface)
 424       return;
 425    if (!intersect_rectangles(surface->width, surface->height,
 426                              texture->width0, texture->height0,
 427                              x, y, width, height,
 428                              offsets, loc))
 429       return;
 430 #if 0
 431    debug_printf("Offset = [%d, %d, %d, %d]\n", offsets[0],
 432                 offsets[1], offsets[2], offsets[3]);
 433    debug_printf("Locati = [%d, %d, %d, %d]\n", loc[0],
 434                 loc[1], loc[2], loc[3]);
 435 #endif
 436
 437    /* prepare our blend surface */
 438    vg_prepare_blend_surface_from_mask(ctx);
 439
 440    cso_save_samplers(ctx->cso_context);
 441    cso_save_fragment_sampler_views(ctx->cso_context);
 442    cso_save_framebuffer(ctx->cso_context);
 443    cso_save_blend(ctx->cso_context);
 444    cso_save_fragment_shader(ctx->cso_context);
 445    cso_save_viewport(ctx->cso_context);
 446
 447    setup_mask_samplers(sampler_view);
 448    setup_mask_blend();
 449    setup_mask_operation(operation);
 450    setup_mask_framebuffer(surface, surface->width, surface->height);
 451    setup_mask_viewport();
 452
 453    /* render the quad to propagate the rendering from stencil */
 454    renderer_draw_texture(ctx->renderer, texture,
 455                          offsets[0], offsets[1],
 456                          offsets[0] + offsets[2], offsets[1] + offsets[3],
 457                          loc[0], loc[1], loc[0] + loc[2], loc[1] + loc[3]);
 458
 459    /* make sure rendering has completed */
 460    ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 461    cso_restore_blend(ctx->cso_context);
 462    cso_restore_framebuffer(ctx->cso_context);
 463    cso_restore_fragment_shader(ctx->cso_context);
 464    cso_restore_samplers(ctx->cso_context);
 465    cso_restore_fragment_sampler_views(ctx->cso_context);
 466    cso_restore_viewport(ctx->cso_context);
 467
 468    pipe_surface_reference(&surface, NULL);
 469 }
 470
 471
 472 #ifdef OPENVG_VERSION_1_1
 473
 474 struct vg_mask_layer * mask_layer_create(VGint width, VGint height)
 475 {
 476    struct vg_context *ctx = vg_current_context();
 477    struct vg_mask_layer *mask = 0;
 478
 479    mask = CALLOC_STRUCT(vg_mask_layer);
 480    vg_init_object(&mask->base, ctx, VG_OBJECT_MASK);
 481    mask->width = width;
 482    mask->height = height;
 483
 484    {
 485       struct pipe_texture pt;
 486       struct pipe_context *pipe = ctx->pipe;
 487       struct pipe_screen *screen = ctx->pipe->screen;
 488       struct pipe_sampler_view view_templ;
 489       struct pipe_sampler_view *view = NULL;
 490       struct pipe_texture *texture;
 491
 492       memset(&pt, 0, sizeof(pt));
 493       pt.target = PIPE_TEXTURE_2D;
 494       pt.format = PIPE_FORMAT_B8G8R8A8_UNORM;
 495       pt.last_level = 0;
 496       pt.width0 = width;
 497       pt.height0 = height;
 498       pt.depth0 = 1;
 499       pt.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER;
 500       pt.compressed = 0;
 501
 502       texture = screen->texture_create(screen, &pt);
 503
 504       if (texture) {
 505          u_sampler_view_default_template(&view_templ, texture, texture->format);
 506          view = pipe->create_sampler_view(pipe, texture, &view_templ);
 507       }
 508       pipe_texture_reference(&texture, NULL);
 509       mask->sampler_view = view;
 510    }
 511
 512    vg_context_add_object(ctx, VG_OBJECT_MASK, mask);
 513
 514    return mask;
 515 }
 516
 517 void mask_layer_destroy(struct vg_mask_layer *layer)
 518 {
 519    struct vg_context *ctx = vg_current_context();
 520
 521    vg_context_remove_object(ctx, VG_OBJECT_MASK, layer);
 522    pipe_texture_release(&layer->texture);
 523    free(layer);
 524 }
 525
 526 void mask_layer_fill(struct vg_mask_layer *layer,
 527                      VGint x, VGint y,
 528                      VGint width, VGint height,
 529                      VGfloat value)
 530 {
 531    struct vg_context *ctx = vg_current_context();
 532    VGfloat alpha_color[4] = {0, 0, 0, 0};
 533    struct pipe_surface *surface;
 534
 535    alpha_color[3] = value;
 536
 537    surface = ctx->pipe->screen->get_tex_surface(
 538       ctx->pipe->screen, layer->sampler_view->texture,
 539       0, 0, 0,
 540       PIPE_BUFFER_USAGE_GPU_WRITE);
 541
 542    surface_fill(surface,
 543                 layer->width, layer->height,
 544                 x, y, width, height, alpha_color);
 545
 546    ctx->pipe->screen->tex_surface_release(ctx->pipe->screen, &surface);
 547 }
 548
 549 void mask_copy(struct vg_mask_layer *layer,
 550                VGint sx, VGint sy,
 551                VGint dx, VGint dy,
 552                VGint width, VGint height)
 553 {
 554     struct vg_context *ctx = vg_current_context();
 555     struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 556
 557     renderer_copy_texture(ctx->renderer,
 558                           layer->sampler_view,
 559                           sx, sy,
 560                           sx + width, sy + height,
 561                           fb_buffers->alpha_mask_view->texture,
 562                           dx, dy,
 563                           dx + width, dy + height);
 564 }
 565
 566 static void mask_layer_render_to(struct vg_mask_layer *layer,
 567                                  struct path *path,
 568                                  VGbitfield paint_modes)
 569 {
 570    struct vg_context *ctx = vg_current_context();
 571    const VGfloat fill_color[4] = {1.f, 1.f, 1.f, 1.f};
 572    struct pipe_screen *screen = ctx->pipe->screen;
 573    struct pipe_surface *surface;
 574
 575    surface = screen->get_tex_surface(screen, layer->sampler_view->texture,  0, 0, 0,
 576                                      PIPE_BUFFER_USAGE_GPU_WRITE);
 577
 578    cso_save_framebuffer(ctx->cso_context);
 579    cso_save_fragment_shader(ctx->cso_context);
 580    cso_save_viewport(ctx->cso_context);
 581
 582    setup_mask_blend();
 583    setup_mask_fill(fill_color);
 584    setup_mask_framebuffer(surface, layer->width, layer->height);
 585    setup_mask_viewport();
 586
 587    if (paint_modes & VG_FILL_PATH) {
 588       struct matrix *mat = &ctx->state.vg.path_user_to_surface_matrix;
 589       path_fill(path, mat);
 590    }
 591
 592    if (paint_modes & VG_STROKE_PATH){
 593       path_stroke(path);
 594    }
 595
 596
 597    /* make sure rendering has completed */
 598    ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 599
 600    cso_restore_framebuffer(ctx->cso_context);
 601    cso_restore_fragment_shader(ctx->cso_context);
 602    cso_restore_viewport(ctx->cso_context);
 603    ctx->state.dirty |= BLEND_DIRTY;
 604
 605    screen->tex_surface_release(ctx->pipe->screen, &surface);
 606 }
 607
 608 void mask_render_to(struct path *path,
 609                     VGbitfield paint_modes,
 610                     VGMaskOperation operation)
 611 {
 612    struct vg_context *ctx = vg_current_context();
 613    struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 614    struct vg_mask_layer *temp_layer;
 615    VGint width, height;
 616
 617    width = fb_buffers->alpha_mask_view->texture->width0;
 618    height = fb_buffers->alpha_mask_view->texture->width0;
 619
 620    temp_layer = mask_layer_create(width, height);
 621
 622    mask_layer_render_to(temp_layer, path, paint_modes);
 623
 624    mask_using_layer(temp_layer, 0, 0, width, height,
 625                     operation);
 626
 627    mask_layer_destroy(temp_layer);
 628 }
 629
 630 void mask_using_layer(struct vg_mask_layer *layer,
 631                       VGMaskOperation operation,
 632                       VGint x, VGint y,
 633                       VGint width, VGint height)
 634 {
 635    mask_using_texture(layer->sampler_view, operation,
 636                       x, y, width, height);
 637 }
 638
 639 VGint mask_layer_width(struct vg_mask_layer *layer)
 640 {
 641    return layer->width;
 642 }
 643
 644 VGint mask_layer_height(struct vg_mask_layer *layer)
 645 {
 646    return layer->height;
 647 }
 648
 649
 650 #endif
 651
 652 void mask_using_image(struct vg_image *image,
 653                       VGMaskOperation operation,
 654                       VGint x, VGint y,
 655                       VGint width, VGint height)
 656 {
 657    mask_using_texture(image->sampler_view, operation,
 658                       x, y, width, height);
 659 }
 660
 661 void mask_fill(VGint x, VGint y, VGint width, VGint height,
 662                VGfloat value)
 663 {
 664    struct vg_context *ctx = vg_current_context();
 665    VGfloat alpha_color[4] = {.0f, .0f, .0f, value};
 666    struct pipe_surface *surf = alpha_mask_surface(
 667       ctx, PIPE_BUFFER_USAGE_GPU_WRITE);
 668
 669 #if DEBUG_MASKS
 670    debug_printf("mask_fill(%d, %d, %d, %d) with  rgba(%f, %f, %f, %f)\n",
 671                 x, y, width, height,
 672                 alpha_color[0], alpha_color[1],
 673                 alpha_color[2], alpha_color[3]);
 674    debug_printf("XXX %f  === %f \n",
 675                 alpha_color[3], value);
 676 #endif
 677
 678    surface_fill(surf, surf->width, surf->height,
 679                 x, y, width, height, alpha_color);
 680
 681    pipe_surface_reference(&surf, NULL);
 682 }
 683
 684 VGint mask_bind_samplers(struct pipe_sampler_state **samplers,
 685                          struct pipe_sampler_view **sampler_views)
 686 {
 687    struct vg_context *ctx = vg_current_context();
 688
 689    if (ctx->state.vg.masking) {
 690       struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 691
 692       samplers[1] = &ctx->mask.sampler;
 693       sampler_views[1] = fb_buffers->alpha_mask_view;
 694       return 1;
 695    } else
 696       return 0;
 697 }