mix-blend-mode implementation for accelerated layers

cc/quads/render_pass_draw_quad.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/quads/render_pass_draw_quad.h"
 
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
 
 namespace cc {
 
 RenderPassDrawQuad::RenderPassDrawQuad()
     : render_pass_id(RenderPass::Id(-1, -1)),
       is_replica(false),
-      mask_resource_id(-1) {
+      mask_resource_id(-1),
+      blend_mode(SkXfermode::kSrcOver_Mode) {
 }
 
 RenderPassDrawQuad::~RenderPassDrawQuad() {
 }
 
 scoped_ptr<RenderPassDrawQuad> RenderPassDrawQuad::Create() {
   return make_scoped_ptr(new RenderPassDrawQuad);
 }
 
 scoped_ptr<RenderPassDrawQuad> RenderPassDrawQuad::Copy(
     const SharedQuadState* copied_shared_quad_state,
     RenderPass::Id copied_render_pass_id) const {
   scoped_ptr<RenderPassDrawQuad> copy_quad(
       new RenderPassDrawQuad(*MaterialCast(this)));
   copy_quad->shared_quad_state = copied_shared_quad_state;
   copy_quad->render_pass_id = copied_render_pass_id;
   return copy_quad.Pass();
 }
 
 void RenderPassDrawQuad::SetNew(
     const SharedQuadState* shared_quad_state,
     gfx::Rect rect,
     RenderPass::Id render_pass_id,
     bool is_replica,
     ResourceProvider::ResourceId mask_resource_id,
     gfx::Rect contents_changed_since_last_frame,
     gfx::RectF mask_uv_rect,
     const FilterOperations& filters,
     skia::RefPtr<SkImageFilter> filter,
-    const FilterOperations& background_filters) {
+    const FilterOperations& background_filters,
+    SkXfermode::Mode blend_mode) {
   DCHECK_GT(render_pass_id.layer_id, 0);
   DCHECK_GE(render_pass_id.index, 0);
 
   gfx::Rect opaque_rect;
   gfx::Rect visible_rect = rect;
   bool needs_blending = false;
   SetAll(shared_quad_state, rect, opaque_rect, visible_rect, needs_blending,
          render_pass_id, is_replica, mask_resource_id,
          contents_changed_since_last_frame, mask_uv_rect, filters, filter,
-         background_filters);
+         background_filters, blend_mode);
 }
 
 void RenderPassDrawQuad::SetAll(
     const SharedQuadState* shared_quad_state,
     gfx::Rect rect,
     gfx::Rect opaque_rect,
     gfx::Rect visible_rect,
     bool needs_blending,
     RenderPass::Id render_pass_id,
     bool is_replica,
     ResourceProvider::ResourceId mask_resource_id,
     gfx::Rect contents_changed_since_last_frame,
     gfx::RectF mask_uv_rect,
     const FilterOperations& filters,
     skia::RefPtr<SkImageFilter> filter,
-    const FilterOperations& background_filters) {
+    const FilterOperations& background_filters,
+    SkXfermode::Mode blend_mode) {
   DCHECK_GT(render_pass_id.layer_id, 0);
   DCHECK_GE(render_pass_id.index, 0);
 
   DrawQuad::SetAll(shared_quad_state, DrawQuad::RENDER_PASS, rect, opaque_rect,
                    visible_rect, needs_blending);
   this->render_pass_id = render_pass_id;
   this->is_replica = is_replica;
   this->mask_resource_id = mask_resource_id;
   this->contents_changed_since_last_frame = contents_changed_since_last_frame;
   this->mask_uv_rect = mask_uv_rect;
   this->filters = filters;
   this->filter = filter;
   this->background_filters = background_filters;
+  this->blend_mode = blend_mode;
 }
 
 void RenderPassDrawQuad::IterateResources(
     const ResourceIteratorCallback& callback) {
   if (mask_resource_id)
     mask_resource_id = callback.Run(mask_resource_id);
 }
 
 const RenderPassDrawQuad* RenderPassDrawQuad::MaterialCast(
     const DrawQuad* quad) {
@@ skipping 10 matching lines @@
              MathUtil::AsValue(contents_changed_since_last_frame).release());
   value->Set("mask_uv_rect", MathUtil::AsValue(mask_uv_rect).release());
   value->Set("filters", filters.AsValue().release());
   // TODO(piman): dump SkImageFilters rather than just indicating if there are
   // any or not.
   value->SetBoolean("has_filter", !!filter);
   value->Set("background_filters", background_filters.AsValue().release());
 }
 
 }  // namespace cc