OpenVG 1.0 State Tracker

Import of the OpenVG 1.0 state tracker for Gallium.

1 files changed, 690 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/vega/mask.c b/src/gallium/state_trackers/vega/mask.c
new file mode 100644
index 00000000000..24650a37d50
--- /dev/null
+++ b/src/gallium/state_trackers/vega/mask.c
@@ -0,0 +1,690 @@
+/**************************************************************************
+ *
+ * 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 "mask.h"
+
+#include "path.h"
+#include "image.h"
+#include "shaders_cache.h"
+#include "renderer.h"
+#include "asm_util.h"
+#include "st_inlines.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_screen.h"
+#include "pipe/p_inlines.h"
+#include "util/u_memory.h"
+
+struct vg_mask_layer {
+   struct vg_object base;
+
+   VGint width;
+   VGint height;
+
+   struct pipe_texture *texture;
+};
+
+static INLINE struct pipe_surface *
+alpha_mask_surface(struct vg_context *ctx, int usage)
+{
+   struct pipe_screen *screen = ctx->pipe->screen;
+   struct st_framebuffer *stfb = ctx->draw_buffer;
+   return screen->get_tex_surface(screen,
+                                  stfb->alpha_mask,
+                                  0, 0, 0,
+                                  usage);
+}
+
+static INLINE VGboolean
+intersect_rectangles(VGint dwidth, VGint dheight,
+                     VGint swidth, VGint sheight,
+                     VGint tx, VGint ty,
+                     VGint twidth, VGint theight,
+                     VGint *offsets,
+                     VGint *location)
+{
+   if (tx + twidth <= 0 || tx >= dwidth)
+      return VG_FALSE;
+   if (ty + theight <= 0 || ty >= dheight)
+      return VG_FALSE;
+
+   offsets[0] = 0;
+   offsets[1] = 0;
+   location[0] = tx;
+   location[1] = ty;
+
+   if (tx < 0) {
+      offsets[0] -= tx;
+      location[0] = 0;
+
+      location[2] = MIN2(tx + swidth, MIN2(dwidth, tx + twidth));
+      offsets[2] = location[2];
+   } else {
+      offsets[2] = MIN2(twidth, MIN2(dwidth - tx, swidth ));
+      location[2] = offsets[2];
+   }
+
+   if (ty < 0) {
+      offsets[1] -= ty;
+      location[1] = 0;
+
+      location[3] = MIN2(ty + sheight, MIN2(dheight, ty + theight));
+      offsets[3] = location[3];
+   } else {
+      offsets[3] = MIN2(theight, MIN2(dheight - ty, sheight));
+      location[3] = offsets[3];
+   }
+
+   return VG_TRUE;
+}
+
+#if DEBUG_MASKS
+static void read_alpha_mask(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;
+
+   struct st_framebuffer *stfb = ctx->draw_buffer;
+   struct st_renderbuffer *strb = stfb->alpha_mask;
+   struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
+
+   VGfloat temp[VEGA_MAX_IMAGE_WIDTH][4];
+   VGfloat *df = (VGfloat*)temp;
+   VGint y = (fb->height - sy) - 1, yStep = -1;
+   VGint i;
+   VGubyte *dst = (VGubyte *)data;
+   VGint xoffset = 0, yoffset = 0;
+
+   /* make sure rendering has completed */
+   pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+   if (sx < 0) {
+      xoffset = -sx;
+      xoffset *= _vega_size_for_format(dataFormat);
+      width += sx;
+      sx = 0;
+   }
+   if (sy < 0) {
+      yoffset = -sy;
+      height += sy;
+      sy = 0;
+      y = (fb->height - sy) - 1;
+      yoffset *= dataStride;
+   }
+
+   {
+      struct pipe_surface *surf;
+
+      surf = screen->get_tex_surface(screen, strb->texture,  0, 0, 0,
+                                     PIPE_BUFFER_USAGE_CPU_READ);
+
+      /* 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(surf, sx, y, width, 1, df);
+         y += yStep;
+         _vega_pack_rgba_span_float(ctx, width, temp, dataFormat,
+                                    dst + yoffset + xoffset);
+         dst += dataStride;
+      }
+
+      pipe_surface_reference(&surf, NULL);
+   }
+}
+
+void save_alpha_to_file(const char *filename)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct pipe_framebuffer_state *fb = &ctx->state.g3d.fb;
+   VGint *data;
+   int i, j;
+
+   data = malloc(sizeof(int) * fb->width * fb->height);
+   read_alpha_mask(data, fb->width * sizeof(int),
+                   VG_sRGBA_8888,
+                   0, 0, fb->width, fb->height);
+   fprintf(stderr, "/*---------- start */\n");
+   fprintf(stderr, "const int image_width = %d;\n",
+           fb->width);
+   fprintf(stderr, "const int image_height = %d;\n",
+           fb->height);
+   fprintf(stderr, "const int image_data = {\n");
+   for (i = 0; i < fb->height; ++i) {
+      for (j = 0; j < fb->width; ++j) {
+         int rgba = data[i * fb->height + j];
+         int argb = 0;
+         argb = (rgba >> 8);
+         argb |= ((rgba & 0xff) << 24);
+         fprintf(stderr, "0x%x, ", argb);
+      }
+      fprintf(stderr, "\n");
+   }
+   fprintf(stderr, "};\n");
+   fprintf(stderr, "/*---------- end */\n");
+}
+#endif
+
+static void setup_mask_framebuffer(struct pipe_surface *surf,
+                                   VGint surf_width, VGint surf_height)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct pipe_framebuffer_state fb;
+
+   memset(&fb, 0, sizeof(fb));
+   fb.width = surf_width;
+   fb.height = surf_height;
+   fb.nr_cbufs = 1;
+   fb.cbufs[0] = surf;
+   {
+      VGint i;
+      for (i = 1; i < PIPE_MAX_COLOR_BUFS; ++i)
+         fb.cbufs[i] = 0;
+   }
+   cso_set_framebuffer(ctx->cso_context, &fb);
+}
+
+
+/* setup shader constants */
+static void setup_mask_operation(VGMaskOperation operation)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct pipe_constant_buffer *cbuf = &ctx->mask.cbuf;
+   const VGint param_bytes = 4 * sizeof(VGfloat);
+   const VGfloat ones[4] = {1.f, 1.f, 1.f, 1.f};
+   void *shader = 0;
+
+   /* We always need to get a new buffer, to keep the drivers simple and
+    * avoid gratuitous rendering synchronization.
+    */
+   pipe_buffer_reference(&cbuf->buffer, NULL);
+
+   cbuf->buffer = pipe_buffer_create(ctx->pipe->screen, 1,
+                                     PIPE_BUFFER_USAGE_CONSTANT,
+                                     param_bytes);
+   if (cbuf->buffer) {
+      st_no_flush_pipe_buffer_write(ctx, cbuf->buffer,
+                                    0, param_bytes, ones);
+   }
+
+   ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, cbuf);
+   switch (operation) {
+   case VG_UNION_MASK: {
+      if (!ctx->mask.union_fs) {
+         ctx->mask.union_fs = shader_create_from_text(ctx->pipe,
+                                                      union_mask_asm,
+                                                      200,
+                                                      PIPE_SHADER_FRAGMENT);
+      }
+      shader = ctx->mask.union_fs->driver;
+   }
+      break;
+   case VG_INTERSECT_MASK: {
+      if (!ctx->mask.intersect_fs) {
+         ctx->mask.intersect_fs = shader_create_from_text(ctx->pipe,
+                                                          intersect_mask_asm,
+                                                          200,
+                                                          PIPE_SHADER_FRAGMENT);
+      }
+      shader = ctx->mask.intersect_fs->driver;
+   }
+      break;
+   case VG_SUBTRACT_MASK: {
+      if (!ctx->mask.subtract_fs) {
+         ctx->mask.subtract_fs = shader_create_from_text(ctx->pipe,
+                                                         subtract_mask_asm,
+                                                         200,
+                                                         PIPE_SHADER_FRAGMENT);
+      }
+      shader = ctx->mask.subtract_fs->driver;
+   }
+      break;
+   case VG_SET_MASK: {
+      if (!ctx->mask.set_fs) {
+         ctx->mask.set_fs = shader_create_from_text(ctx->pipe,
+                                                    set_mask_asm,
+                                                    200,
+                                                    PIPE_SHADER_FRAGMENT);
+      }
+      shader = ctx->mask.set_fs->driver;
+   }
+      break;
+   default:
+         assert(0);
+      break;
+   }
+   cso_set_fragment_shader_handle(ctx->cso_context, shader);
+}
+
+static void setup_mask_samplers(struct pipe_texture *umask)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
+   struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
+   struct st_framebuffer *fb_buffers = ctx->draw_buffer;
+   struct pipe_texture *uprev = NULL;
+   struct pipe_sampler_state sampler;
+
+   uprev = fb_buffers->blend_texture;
+   sampler = ctx->mask.sampler;
+   sampler.normalized_coords = 1;
+
+   samplers[0] = NULL;
+   samplers[1] = NULL;
+   samplers[2] = NULL;
+   textures[0] = NULL;
+   textures[1] = NULL;
+   textures[2] = NULL;
+
+   samplers[0] = &sampler;
+   samplers[1] = &ctx->mask.sampler;
+
+   textures[0] = umask;
+   textures[1] = uprev;
+
+   cso_set_samplers(ctx->cso_context, 2,
+                    (const struct pipe_sampler_state **)samplers);
+   cso_set_sampler_textures(ctx->cso_context, 2, textures);
+}
+
+
+/* setup shader constants */
+static void setup_mask_fill(const VGfloat color[4])
+{
+   struct vg_context *ctx = vg_current_context();
+   struct pipe_constant_buffer *cbuf = &ctx->mask.cbuf;
+   const VGint param_bytes = 4 * sizeof(VGfloat);
+
+   /* We always need to get a new buffer, to keep the drivers simple and
+    * avoid gratuitous rendering synchronization.
+    */
+   pipe_buffer_reference(&cbuf->buffer, NULL);
+
+   cbuf->buffer = pipe_buffer_create(ctx->pipe->screen, 1,
+                                     PIPE_BUFFER_USAGE_CONSTANT,
+                                     param_bytes);
+   if (cbuf->buffer) {
+      st_no_flush_pipe_buffer_write(ctx, cbuf->buffer, 0, param_bytes, color);
+   }
+
+   ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, cbuf);
+   cso_set_fragment_shader_handle(ctx->cso_context,
+                                  shaders_cache_fill(ctx->sc,
+                                                     VEGA_SOLID_FILL_SHADER));
+}
+
+static void setup_mask_viewport()
+{
+   struct vg_context *ctx = vg_current_context();
+   vg_set_viewport(ctx, VEGA_Y0_TOP);
+}
+
+static void setup_mask_blend()
+{
+   struct vg_context *ctx = vg_current_context();
+
+   struct pipe_blend_state blend;
+
+   memset(&blend, 0, sizeof(struct pipe_blend_state));
+   blend.blend_enable = 1;
+   blend.colormask |= PIPE_MASK_R;
+   blend.colormask |= PIPE_MASK_G;
+   blend.colormask |= PIPE_MASK_B;
+   blend.colormask |= PIPE_MASK_A;
+   blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
+   blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
+   blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
+   blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
+
+   cso_set_blend(ctx->cso_context, &blend);
+}
+
+
+static void surface_fill(struct pipe_surface *surf,
+                         int surf_width, int surf_height,
+                         int x, int y, int width, int height,
+                         const VGfloat color[4])
+{
+   struct vg_context *ctx = vg_current_context();
+
+   if (x < 0) {
+      width += x;
+      x = 0;
+   }
+   if (y < 0) {
+      height += y;
+      y = 0;
+   }
+
+   cso_save_framebuffer(ctx->cso_context);
+   cso_save_blend(ctx->cso_context);
+   cso_save_fragment_shader(ctx->cso_context);
+   cso_save_viewport(ctx->cso_context);
+
+   setup_mask_blend();
+   setup_mask_fill(color);
+   setup_mask_framebuffer(surf, surf_width, surf_height);
+   setup_mask_viewport();
+
+   renderer_draw_quad(ctx->renderer, x, y,
+                      x + width, y + height, 0.0f/*depth should be disabled*/);
+
+
+   /* make sure rendering has completed */
+   ctx->pipe->flush(ctx->pipe,
+                    PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME,
+                    NULL);
+
+#if DEBUG_MASKS
+   save_alpha_to_file(0);
+#endif
+
+   cso_restore_blend(ctx->cso_context);
+   cso_restore_framebuffer(ctx->cso_context);
+   cso_restore_fragment_shader(ctx->cso_context);
+   cso_restore_viewport(ctx->cso_context);
+}
+
+
+static void mask_using_texture(struct pipe_texture *texture,
+                               VGMaskOperation operation,
+                               VGint x, VGint y,
+                               VGint width, VGint height)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct pipe_surface *surface =
+      alpha_mask_surface(ctx, PIPE_BUFFER_USAGE_GPU_WRITE);
+   VGint offsets[4], loc[4];
+
+   if (!surface)
+      return;
+   if (!intersect_rectangles(surface->width, surface->height,
+                             texture->width[0], texture->height[0],
+                             x, y, width, height,
+                             offsets, loc))
+      return;
+#if 0
+   debug_printf("Offset = [%d, %d, %d, %d]\n", offsets[0],
+                offsets[1], offsets[2], offsets[3]);
+   debug_printf("Locati = [%d, %d, %d, %d]\n", loc[0],
+                loc[1], loc[2], loc[3]);
+#endif
+
+   /* prepare our blend surface */
+   vg_prepare_blend_surface_from_mask(ctx);
+
+   cso_save_samplers(ctx->cso_context);
+   cso_save_sampler_textures(ctx->cso_context);
+   cso_save_framebuffer(ctx->cso_context);
+   cso_save_blend(ctx->cso_context);
+   cso_save_fragment_shader(ctx->cso_context);
+   cso_save_viewport(ctx->cso_context);
+
+   setup_mask_samplers(texture);
+   setup_mask_blend();
+   setup_mask_operation(operation);
+   setup_mask_framebuffer(surface, surface->width, surface->height);
+   setup_mask_viewport();
+
+   /* render the quad to propagate the rendering from stencil */
+   renderer_draw_texture(ctx->renderer, texture,
+                         offsets[0], offsets[1],
+                         offsets[0] + offsets[2], offsets[1] + offsets[3],
+                         loc[0], loc[1], loc[0] + loc[2], loc[1] + loc[3]);
+
+   /* make sure rendering has completed */
+   ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+   cso_restore_blend(ctx->cso_context);
+   cso_restore_framebuffer(ctx->cso_context);
+   cso_restore_fragment_shader(ctx->cso_context);
+   cso_restore_samplers(ctx->cso_context);
+   cso_restore_sampler_textures(ctx->cso_context);
+   cso_restore_viewport(ctx->cso_context);
+
+   pipe_surface_reference(&surface, NULL);
+}
+
+
+#ifdef OPENVG_VERSION_1_1
+
+struct vg_mask_layer * mask_layer_create(VGint width, VGint height)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct vg_mask_layer *mask = 0;
+
+   mask = CALLOC_STRUCT(vg_mask_layer);
+   vg_init_object(&mask->base, ctx, VG_OBJECT_MASK);
+   mask->width = width;
+   mask->height = height;
+
+   {
+      struct pipe_texture pt;
+      struct pipe_screen *screen = ctx->pipe->screen;
+
+      memset(&pt, 0, sizeof(pt));
+      pt.target = PIPE_TEXTURE_2D;
+      pt.format = PIPE_FORMAT_A8R8G8B8_UNORM;
+      pf_get_block(PIPE_FORMAT_A8R8G8B8_UNORM, &pt.block);
+      pt.last_level = 0;
+      pt.width[0] = width;
+      pt.height[0] = height;
+      pt.depth[0] = 1;
+      pt.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER;
+      pt.compressed = 0;
+
+      mask->texture = screen->texture_create(screen, &pt);
+   }
+
+   vg_context_add_object(ctx, VG_OBJECT_MASK, mask);
+
+   return mask;
+}
+
+void mask_layer_destroy(struct vg_mask_layer *layer)
+{
+   struct vg_context *ctx = vg_current_context();
+
+   vg_context_remove_object(ctx, VG_OBJECT_MASK, layer);
+   pipe_texture_release(&layer->texture);
+   free(layer);
+}
+
+void mask_layer_fill(struct vg_mask_layer *layer,
+                     VGint x, VGint y,
+                     VGint width, VGint height,
+                     VGfloat value)
+{
+   struct vg_context *ctx = vg_current_context();
+   VGfloat alpha_color[4] = {0, 0, 0, 0};
+   struct pipe_surface *surface;
+
+   alpha_color[3] = value;
+
+   surface = ctx->pipe->screen->get_tex_surface(
+      ctx->pipe->screen, layer->texture,
+      0, 0, 0,
+      PIPE_BUFFER_USAGE_GPU_WRITE);
+
+   surface_fill(surface,
+                layer->width, layer->height,
+                x, y, width, height, alpha_color);
+
+   ctx->pipe->screen->tex_surface_release(ctx->pipe->screen, &surface);
+}
+
+void mask_copy(struct vg_mask_layer *layer,
+               VGint sx, VGint sy,
+               VGint dx, VGint dy,
+               VGint width, VGint height)
+{
+    struct vg_context *ctx = vg_current_context();
+    struct st_framebuffer *fb_buffers = ctx->draw_buffer;
+
+    renderer_copy_texture(ctx->renderer,
+                          layer->texture,
+                          sx, sy,
+                          sx + width, sy + height,
+                          fb_buffers->alpha_mask,
+                          dx, dy,
+                          dx + width, dy + height);
+}
+
+static void mask_layer_render_to(struct vg_mask_layer *layer,
+                                 struct path *path,
+                                 VGbitfield paint_modes)
+{
+   struct vg_context *ctx = vg_current_context();
+   const VGfloat fill_color[4] = {1.f, 1.f, 1.f, 1.f};
+   struct pipe_screen *screen = ctx->pipe->screen;
+   struct pipe_surface *surface;
+
+   surface = screen->get_tex_surface(screen, layer->texture,  0, 0, 0,
+                                     PIPE_BUFFER_USAGE_GPU_WRITE);
+
+   cso_save_framebuffer(ctx->cso_context);
+   cso_save_fragment_shader(ctx->cso_context);
+   cso_save_viewport(ctx->cso_context);
+
+   setup_mask_blend();
+   setup_mask_fill(fill_color);
+   setup_mask_framebuffer(surface, layer->width, layer->height);
+   setup_mask_viewport();
+
+   if (paint_modes & VG_FILL_PATH) {
+      struct matrix *mat = &ctx->state.vg.path_user_to_surface_matrix;
+      path_fill(path, mat);
+   }
+
+   if (paint_modes & VG_STROKE_PATH){
+      path_stroke(path);
+   }
+
+
+   /* make sure rendering has completed */
+   ctx->pipe->flush(ctx->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+
+   cso_restore_framebuffer(ctx->cso_context);
+   cso_restore_fragment_shader(ctx->cso_context);
+   cso_restore_viewport(ctx->cso_context);
+   ctx->state.dirty |= BLEND_DIRTY;
+
+   screen->tex_surface_release(ctx->pipe->screen, &surface);
+}
+
+void mask_render_to(struct path *path,
+                    VGbitfield paint_modes,
+                    VGMaskOperation operation)
+{
+   struct vg_context *ctx = vg_current_context();
+   struct st_framebuffer *fb_buffers = ctx->draw_buffer;
+   struct vg_mask_layer *temp_layer;
+   VGint width, height;
+
+   width = fb_buffers->alpha_mask->width[0];
+   height = fb_buffers->alpha_mask->width[0];
+
+   temp_layer = mask_layer_create(width, height);
+
+   mask_layer_render_to(temp_layer, path, paint_modes);
+
+   mask_using_layer(temp_layer, 0, 0, width, height,
+                    operation);
+
+   mask_layer_destroy(temp_layer);
+}
+
+void mask_using_layer(struct vg_mask_layer *layer,
+                      VGMaskOperation operation,
+                      VGint x, VGint y,
+                      VGint width, VGint height)
+{
+   mask_using_texture(layer->texture, operation,
+                      x, y, width, height);
+}
+
+VGint mask_layer_width(struct vg_mask_layer *layer)
+{
+   return layer->width;
+}
+
+VGint mask_layer_height(struct vg_mask_layer *layer)
+{
+   return layer->height;
+}
+
+
+#endif
+
+void mask_using_image(struct vg_image *image,
+                      VGMaskOperation operation,
+                      VGint x, VGint y,
+                      VGint width, VGint height)
+{
+   mask_using_texture(image->texture, operation,
+                      x, y, width, height);
+}
+
+void mask_fill(VGint x, VGint y, VGint width, VGint height,
+               VGfloat value)
+{
+   struct vg_context *ctx = vg_current_context();
+   VGfloat alpha_color[4] = {.0f, .0f, .0f, value};
+   struct pipe_surface *surf = alpha_mask_surface(
+      ctx, PIPE_BUFFER_USAGE_GPU_WRITE);
+
+#if DEBUG_MASKS
+   debug_printf("mask_fill(%d, %d, %d, %d) with  rgba(%f, %f, %f, %f)\n",
+                x, y, width, height,
+                alpha_color[0], alpha_color[1],
+                alpha_color[2], alpha_color[3]);
+   debug_printf("XXX %f  === %f \n",
+                alpha_color[3], value);
+#endif
+
+   surface_fill(surf, surf->width, surf->height,
+                x, y, width, height, alpha_color);
+
+   pipe_surface_reference(&surf, NULL);
+}
+
+VGint mask_bind_samplers(struct pipe_sampler_state **samplers,
+                         struct pipe_texture **textures)
+{
+   struct vg_context *ctx = vg_current_context();
+
+   if (ctx->state.vg.masking) {
+      struct st_framebuffer *fb_buffers = ctx->draw_buffer;
+
+      samplers[1] = &ctx->mask.sampler;
+      textures[1] = fb_buffers->alpha_mask;
+      return 1;
+   } else
+      return 0;
+}