mix-blend-mode implementation for accelerated layers

cc/quads/shared_quad_state.cc

Index: cc/quads/shared_quad_state.cc
diff --git a/cc/quads/shared_quad_state.cc b/cc/quads/shared_quad_state.cc
index 6a53d9f6a9f8d1a410deacb6ae8fc44d745d28ed..6d9daa8b216484b1cae967a3e7c69e486b4a4338 100644
--- a/cc/quads/shared_quad_state.cc
+++ b/cc/quads/shared_quad_state.cc
@@ -10,7 +10,9 @@
 
 namespace cc {
 
-SharedQuadState::SharedQuadState() : is_clipped(false), opacity(0.f) {}
+SharedQuadState::SharedQuadState() : is_clipped(false),
+                                     opacity(0.f),
+                                     blend_mode(SkXfermode::kSrcOver_Mode) {}
 
 SharedQuadState::~SharedQuadState() {
   TRACE_EVENT_OBJECT_DELETED_WITH_ID(
@@ -32,13 +34,15 @@ void SharedQuadState::SetAll(
     gfx::Rect visible_content_rect,
     gfx::Rect clip_rect,
     bool is_clipped,
-    float opacity) {
+    float opacity,
+    SkXfermode::Mode blend_mode) {
   this->content_to_target_transform = content_to_target_transform;
   this->content_bounds = content_bounds;
   this->visible_content_rect = visible_content_rect;
   this->clip_rect = clip_rect;
   this->is_clipped = is_clipped;
   this->opacity = opacity;
+  this->blend_mode = blend_mode;
 }
 
 scoped_ptr<base::Value> SharedQuadState::AsValue() const {
@@ -52,6 +56,7 @@ scoped_ptr<base::Value> SharedQuadState::AsValue() const {
   value->SetBoolean("is_clipped", is_clipped);
   value->Set("clip_rect", MathUtil::AsValue(clip_rect).release());
   value->SetDouble("opacity", opacity);
+  value->SetInteger("blend_mode", blend_mode);

[enne (OOO), 2013/09/26 16:25:13]

This should probably be a string to make it readable.

[rosca, 2013/09/27 10:39:06]

Done.

   TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
       TRACE_DISABLED_BY_DEFAULT("cc.debug.quads"),
       value.get(), "cc::SharedQuadState", this);