cc: Ignore certain quads that would otherwise block overlays

cc/output/overlay_unittest.cc

 // Copyright 2014 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/base/scoped_ptr_vector.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/output_surface_client.h"
 #include "cc/output/overlay_candidate_validator.h"
 #include "cc/output/overlay_processor.h"
@@ skipping 138 matching lines @@
   TextureMailbox mailbox =
       TextureMailbox(gpu::Mailbox::Generate(), GL_TEXTURE_2D, sync_point);
   mailbox.set_allow_overlay(true);
   scoped_ptr<SingleReleaseCallbackImpl> release_callback =
       SingleReleaseCallbackImpl::Create(base::Bind(&MailboxReleased));
 
   return resource_provider->CreateResourceFromTextureMailbox(
       mailbox, release_callback.Pass());
 }
 
+SolidColorDrawQuad* CreateSolidColorQuadAt(
+    const SharedQuadState* shared_quad_state,
+    SkColor color,
+    RenderPass* render_pass,
+    const gfx::Rect& rect) {
+  SolidColorDrawQuad* quad =
+      render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
+  quad->SetNew(shared_quad_state, rect, rect, color, false);
+  return quad;
+}
+
 TextureDrawQuad* CreateCandidateQuadAt(ResourceProvider* resource_provider,
                                        const SharedQuadState* shared_quad_state,
                                        RenderPass* render_pass,
                                        const gfx::Rect& rect) {
   ResourceProvider::ResourceId resource_id = CreateResource(resource_provider);
   bool premultiplied_alpha = false;
   bool flipped = false;
   bool nearest_neighbor = false;
   float vertex_opacity[4] = {1.0f, 1.0f, 1.0f, 1.0f};
 
@@ skipping 416 matching lines @@
 
   RenderPassList original_pass_list;
   RenderPass::CopyAll(pass_list, &original_pass_list);
 
   OverlayCandidateList candidate_list;
   overlay_processor_->ProcessForOverlays(&pass_list, &candidate_list);
   EXPECT_EQ(1U, pass_list.size());
   EXPECT_EQ(2U, candidate_list.size());
 }
 
+TEST_F(SingleOverlayOnTopTest, AllowTransparentOnTop) {
+  scoped_ptr<RenderPass> pass = CreateRenderPass();
+  CreateCandidateQuadAt(resource_provider_.get(),
+                        pass->shared_quad_state_list.back(), pass.get(),
+                        kOverlayBottomRightRect);
+  SharedQuadState* shared_state = pass->CreateAndAppendSharedQuadState();
+  shared_state->opacity = 0.f;
+  CreateSolidColorQuadAt(pass->shared_quad_state_list.back(), SK_ColorBLACK,
+                         pass.get(), kOverlayBottomRightRect);
+
+  RenderPassList pass_list;
+  pass_list.push_back(pass.Pass());
+
+  RenderPassList original_pass_list;
+  RenderPass::CopyAll(pass_list, &original_pass_list);
+
+  OverlayCandidateList candidate_list;
+  overlay_processor_->ProcessForOverlays(&pass_list, &candidate_list);
+  EXPECT_EQ(1U, pass_list.size());
+  EXPECT_EQ(2U, candidate_list.size());
+}
+
+TEST_F(SingleOverlayOnTopTest, AllowTransparentColorOnTop) {
+  scoped_ptr<RenderPass> pass = CreateRenderPass();
+  CreateCandidateQuadAt(resource_provider_.get(),
+                        pass->shared_quad_state_list.back(), pass.get(),
+                        kOverlayBottomRightRect);
+  CreateSolidColorQuadAt(pass->shared_quad_state_list.back(),
+                         SK_ColorTRANSPARENT, pass.get(),
+                         kOverlayBottomRightRect);
+
+  RenderPassList pass_list;
+  pass_list.push_back(pass.Pass());
+
+  RenderPassList original_pass_list;
+  RenderPass::CopyAll(pass_list, &original_pass_list);
+
+  OverlayCandidateList candidate_list;
+  overlay_processor_->ProcessForOverlays(&pass_list, &candidate_list);
+  EXPECT_EQ(1U, pass_list.size());
+  EXPECT_EQ(2U, candidate_list.size());
+}
+
 TEST_F(SingleOverlayOnTopTest, RejectVideoSwapTransform) {
   scoped_ptr<RenderPass> pass = CreateRenderPass();
   CreateFullscreenCandidateVideoQuad(resource_provider_.get(),
                                      pass->shared_quad_state_list.back(),
                                      pass.get(), kSwapTransform);
 
   RenderPassList pass_list;
   pass_list.push_back(pass.Pass());
   OverlayCandidateList candidate_list;
   overlay_processor_->ProcessForOverlays(&pass_list, &candidate_list);
@@ skipping 341 matching lines @@
   renderer_->BeginDrawingFrame(&frame3);
   renderer_->FinishDrawingFrame(&frame3);
   EXPECT_TRUE(resource_provider_->InUseByConsumer(resource1));
   SwapBuffers();
   EXPECT_FALSE(resource_provider_->InUseByConsumer(resource1));
   Mock::VerifyAndClearExpectations(&scheduler_);
 }
 
 }  // namespace
 }  // namespace cc