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 "pipe/p_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_texture *texture;
  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,
  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_constant_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->buffer, NULL);
 229
 230    cbuf->buffer = pipe_buffer_create(ctx->pipe->screen, 1,
 231                                      PIPE_BUFFER_USAGE_CONSTANT,
 232                                      param_bytes);
 233    if (cbuf->buffer) {
 234       st_no_flush_pipe_buffer_write(ctx, cbuf->buffer,
 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_texture *umask)
 288 {
 289    struct vg_context *ctx = vg_current_context();
 290    struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 291    struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 292    struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 293    struct pipe_texture *uprev = NULL;
 294    struct pipe_sampler_state sampler;
 295
 296    uprev = fb_buffers->blend_texture;
 297    sampler = ctx->mask.sampler;
 298    sampler.normalized_coords = 1;
 299
 300    samplers[0] = NULL;
 301    samplers[1] = NULL;
 302    samplers[2] = NULL;
 303    textures[0] = NULL;
 304    textures[1] = NULL;
 305    textures[2] = NULL;
 306
 307    samplers[0] = &sampler;
 308    samplers[1] = &ctx->mask.sampler;
 309
 310    textures[0] = umask;
 311    textures[1] = uprev;
 312
 313    cso_set_samplers(ctx->cso_context, 2,
 314                     (const struct pipe_sampler_state **)samplers);
 315    cso_set_sampler_textures(ctx->cso_context, 2, textures);
 316 }
 317
 318
 319 /* setup shader constants */
 320 static void setup_mask_fill(const VGfloat color[4])
 321 {
 322    struct vg_context *ctx = vg_current_context();
 323    struct pipe_constant_buffer *cbuf = &ctx->mask.cbuf;
 324    const VGint param_bytes = 4 * sizeof(VGfloat);
 325
 326    /* We always need to get a new buffer, to keep the drivers simple and
 327     * avoid gratuitous rendering synchronization.
 328     */
 329    pipe_buffer_reference(&cbuf->buffer, NULL);
 330
 331    cbuf->buffer = pipe_buffer_create(ctx->pipe->screen, 1,
 332                                      PIPE_BUFFER_USAGE_CONSTANT,
 333                                      param_bytes);
 334    if (cbuf->buffer) {
 335       st_no_flush_pipe_buffer_write(ctx, cbuf->buffer, 0, param_bytes, color);
 336    }
 337
 338    ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, cbuf);
 339    cso_set_fragment_shader_handle(ctx->cso_context,
 340                                   shaders_cache_fill(ctx->sc,
 341                                                      VEGA_SOLID_FILL_SHADER));
 342 }
 343
 344 static void setup_mask_viewport()
 345 {
 346    struct vg_context *ctx = vg_current_context();
 347    vg_set_viewport(ctx, VEGA_Y0_TOP);
 348 }
 349
 350 static void setup_mask_blend()
 351 {
 352    struct vg_context *ctx = vg_current_context();
 353
 354    struct pipe_blend_state blend;
 355
 356    memset(&blend, 0, sizeof(struct pipe_blend_state));
 357    blend.blend_enable = 1;
 358    blend.colormask |= PIPE_MASK_R;
 359    blend.colormask |= PIPE_MASK_G;
 360    blend.colormask |= PIPE_MASK_B;
 361    blend.colormask |= PIPE_MASK_A;
 362    blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 363    blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 364    blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 365    blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 366
 367    cso_set_blend(ctx->cso_context, &blend);
 368 }
 369
 370
 371 static void surface_fill(struct pipe_surface *surf,
 372                          int surf_width, int surf_height,
 373                          int x, int y, int width, int height,
 374                          const VGfloat color[4])
 375 {
 376    struct vg_context *ctx = vg_current_context();
 377
 378    if (x < 0) {
 379       width += x;
 380       x = 0;
 381    }
 382    if (y < 0) {
 383       height += y;
 384       y = 0;
 385    }
 386
 387    cso_save_framebuffer(ctx->cso_context);
 388    cso_save_blend(ctx->cso_context);
 389    cso_save_fragment_shader(ctx->cso_context);
 390    cso_save_viewport(ctx->cso_context);
 391
 392    setup_mask_blend();
 393    setup_mask_fill(color);
 394    setup_mask_framebuffer(surf, surf_width, surf_height);
 395    setup_mask_viewport();
 396
 397    renderer_draw_quad(ctx->renderer, x, y,
 398                       x + width, y + height, 0.0f/*depth should be disabled*/);
 399
 400
 401    /* make sure rendering has completed */
 402    ctx->pipe->flush(ctx->pipe,
 403                     PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME,
 404                     NULL);
 405
 406 #if DEBUG_MASKS
 407    save_alpha_to_file(0);
 408 #endif
 409
 410    cso_restore_blend(ctx->cso_context);
 411    cso_restore_framebuffer(ctx->cso_context);
 412    cso_restore_fragment_shader(ctx->cso_context);
 413    cso_restore_viewport(ctx->cso_context);
 414 }
 415
 416
 417 static void mask_using_texture(struct pipe_texture *texture,
 418                                VGMaskOperation operation,
 419                                VGint x, VGint y,
 420                                VGint width, VGint height)
 421 {
 422    struct vg_context *ctx = vg_current_context();
 423    struct pipe_surface *surface =
 424       alpha_mask_surface(ctx, PIPE_BUFFER_USAGE_GPU_WRITE);
 425    VGint offsets[4], loc[4];
 426
 427    if (!surface)
 428       return;
 429    if (!intersect_rectangles(surface->width, surface->height,
 430                              texture->width0, texture->height0,
 431                              x, y, width, height,
 432                              offsets, loc))
 433       return;
 434 #if 0
 435    debug_printf("Offset = [%d, %d, %d, %d]\n", offsets[0],
 436                 offsets[1], offsets[2], offsets[3]);
 437    debug_printf("Locati = [%d, %d, %d, %d]\n", loc[0],
 438                 loc[1], loc[2], loc[3]);
 439 #endif
 440
 441    /* prepare our blend surface */
 442    vg_prepare_blend_surface_from_mask(ctx);
 443
 444    cso_save_samplers(ctx->cso_context);
 445    cso_save_sampler_textures(ctx->cso_context);
 446    cso_save_framebuffer(ctx->cso_context);
 447    cso_save_blend(ctx->cso_context);
 448    cso_save_fragment_shader(ctx->cso_context);
 449    cso_save_viewport(ctx->cso_context);
 450
 451    setup_mask_samplers(texture);
 452    setup_mask_blend();
 453    setup_mask_operation(operation);
 454    setup_mask_framebuffer(surface, surface->width, surface->height);
 455    setup_mask_viewport();
 456
 457    /* render the quad to propagate the rendering from stencil */
 458    renderer_draw_texture(ctx->renderer, texture,
 459                          offsets[0], offsets[1],
 460                          offsets[0] + offsets[2], offsets[1] + offsets[3],
 461                          loc[0], loc[1], loc[0] + loc[2], loc[1] + loc[3]);
 462
 463    /* make sure rendering has completed */
 464    ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 465    cso_restore_blend(ctx->cso_context);
 466    cso_restore_framebuffer(ctx->cso_context);
 467    cso_restore_fragment_shader(ctx->cso_context);
 468    cso_restore_samplers(ctx->cso_context);
 469    cso_restore_sampler_textures(ctx->cso_context);
 470    cso_restore_viewport(ctx->cso_context);
 471
 472    pipe_surface_reference(&surface, NULL);
 473 }
 474
 475
 476 #ifdef OPENVG_VERSION_1_1
 477
 478 struct vg_mask_layer * mask_layer_create(VGint width, VGint height)
 479 {
 480    struct vg_context *ctx = vg_current_context();
 481    struct vg_mask_layer *mask = 0;
 482
 483    mask = CALLOC_STRUCT(vg_mask_layer);
 484    vg_init_object(&mask->base, ctx, VG_OBJECT_MASK);
 485    mask->width = width;
 486    mask->height = height;
 487
 488    {
 489       struct pipe_texture pt;
 490       struct pipe_screen *screen = ctx->pipe->screen;
 491
 492       memset(&pt, 0, sizeof(pt));
 493       pt.target = PIPE_TEXTURE_2D;
 494       pt.format = PIPE_FORMAT_A8R8G8B8_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       mask->texture = screen->texture_create(screen, &pt);
 503    }
 504
 505    vg_context_add_object(ctx, VG_OBJECT_MASK, mask);
 506
 507    return mask;
 508 }
 509
 510 void mask_layer_destroy(struct vg_mask_layer *layer)
 511 {
 512    struct vg_context *ctx = vg_current_context();
 513
 514    vg_context_remove_object(ctx, VG_OBJECT_MASK, layer);
 515    pipe_texture_release(&layer->texture);
 516    free(layer);
 517 }
 518
 519 void mask_layer_fill(struct vg_mask_layer *layer,
 520                      VGint x, VGint y,
 521                      VGint width, VGint height,
 522                      VGfloat value)
 523 {
 524    struct vg_context *ctx = vg_current_context();
 525    VGfloat alpha_color[4] = {0, 0, 0, 0};
 526    struct pipe_surface *surface;
 527
 528    alpha_color[3] = value;
 529
 530    surface = ctx->pipe->screen->get_tex_surface(
 531       ctx->pipe->screen, layer->texture,
 532       0, 0, 0,
 533       PIPE_BUFFER_USAGE_GPU_WRITE);
 534
 535    surface_fill(surface,
 536                 layer->width, layer->height,
 537                 x, y, width, height, alpha_color);
 538
 539    ctx->pipe->screen->tex_surface_release(ctx->pipe->screen, &surface);
 540 }
 541
 542 void mask_copy(struct vg_mask_layer *layer,
 543                VGint sx, VGint sy,
 544                VGint dx, VGint dy,
 545                VGint width, VGint height)
 546 {
 547     struct vg_context *ctx = vg_current_context();
 548     struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 549
 550     renderer_copy_texture(ctx->renderer,
 551                           layer->texture,
 552                           sx, sy,
 553                           sx + width, sy + height,
 554                           fb_buffers->alpha_mask,
 555                           dx, dy,
 556                           dx + width, dy + height);
 557 }
 558
 559 static void mask_layer_render_to(struct vg_mask_layer *layer,
 560                                  struct path *path,
 561                                  VGbitfield paint_modes)
 562 {
 563    struct vg_context *ctx = vg_current_context();
 564    const VGfloat fill_color[4] = {1.f, 1.f, 1.f, 1.f};
 565    struct pipe_screen *screen = ctx->pipe->screen;
 566    struct pipe_surface *surface;
 567
 568    surface = screen->get_tex_surface(screen, layer->texture,  0, 0, 0,
 569                                      PIPE_BUFFER_USAGE_GPU_WRITE);
 570
 571    cso_save_framebuffer(ctx->cso_context);
 572    cso_save_fragment_shader(ctx->cso_context);
 573    cso_save_viewport(ctx->cso_context);
 574
 575    setup_mask_blend();
 576    setup_mask_fill(fill_color);
 577    setup_mask_framebuffer(surface, layer->width, layer->height);
 578    setup_mask_viewport();
 579
 580    if (paint_modes & VG_FILL_PATH) {
 581       struct matrix *mat = &ctx->state.vg.path_user_to_surface_matrix;
 582       path_fill(path, mat);
 583    }
 584
 585    if (paint_modes & VG_STROKE_PATH){
 586       path_stroke(path);
 587    }
 588
 589
 590    /* make sure rendering has completed */
 591    ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 592
 593    cso_restore_framebuffer(ctx->cso_context);
 594    cso_restore_fragment_shader(ctx->cso_context);
 595    cso_restore_viewport(ctx->cso_context);
 596    ctx->state.dirty |= BLEND_DIRTY;
 597
 598    screen->tex_surface_release(ctx->pipe->screen, &surface);
 599 }
 600
 601 void mask_render_to(struct path *path,
 602                     VGbitfield paint_modes,
 603                     VGMaskOperation operation)
 604 {
 605    struct vg_context *ctx = vg_current_context();
 606    struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 607    struct vg_mask_layer *temp_layer;
 608    VGint width, height;
 609
 610    width = fb_buffers->alpha_mask->width0;
 611    height = fb_buffers->alpha_mask->width0;
 612
 613    temp_layer = mask_layer_create(width, height);
 614
 615    mask_layer_render_to(temp_layer, path, paint_modes);
 616
 617    mask_using_layer(temp_layer, 0, 0, width, height,
 618                     operation);
 619
 620    mask_layer_destroy(temp_layer);
 621 }
 622
 623 void mask_using_layer(struct vg_mask_layer *layer,
 624                       VGMaskOperation operation,
 625                       VGint x, VGint y,
 626                       VGint width, VGint height)
 627 {
 628    mask_using_texture(layer->texture, operation,
 629                       x, y, width, height);
 630 }
 631
 632 VGint mask_layer_width(struct vg_mask_layer *layer)
 633 {
 634    return layer->width;
 635 }
 636
 637 VGint mask_layer_height(struct vg_mask_layer *layer)
 638 {
 639    return layer->height;
 640 }
 641
 642
 643 #endif
 644
 645 void mask_using_image(struct vg_image *image,
 646                       VGMaskOperation operation,
 647                       VGint x, VGint y,
 648                       VGint width, VGint height)
 649 {
 650    mask_using_texture(image->texture, operation,
 651                       x, y, width, height);
 652 }
 653
 654 void mask_fill(VGint x, VGint y, VGint width, VGint height,
 655                VGfloat value)
 656 {
 657    struct vg_context *ctx = vg_current_context();
 658    VGfloat alpha_color[4] = {.0f, .0f, .0f, value};
 659    struct pipe_surface *surf = alpha_mask_surface(
 660       ctx, PIPE_BUFFER_USAGE_GPU_WRITE);
 661
 662 #if DEBUG_MASKS
 663    debug_printf("mask_fill(%d, %d, %d, %d) with  rgba(%f, %f, %f, %f)\n",
 664                 x, y, width, height,
 665                 alpha_color[0], alpha_color[1],
 666                 alpha_color[2], alpha_color[3]);
 667    debug_printf("XXX %f  === %f \n",
 668                 alpha_color[3], value);
 669 #endif
 670
 671    surface_fill(surf, surf->width, surf->height,
 672                 x, y, width, height, alpha_color);
 673
 674    pipe_surface_reference(&surf, NULL);
 675 }
 676
 677 VGint mask_bind_samplers(struct pipe_sampler_state **samplers,
 678                          struct pipe_texture **textures)
 679 {
 680    struct vg_context *ctx = vg_current_context();
 681
 682    if (ctx->state.vg.masking) {
 683       struct st_framebuffer *fb_buffers = ctx->draw_buffer;
 684
 685       samplers[1] = &ctx->mask.sampler;
 686       textures[1] = fb_buffers->alpha_mask;
 687       return 1;
 688    } else
 689       return 0;
 690 }