[Ozone] Fix SingleOnTop issue by checking if the quad is clipped.

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/region.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/output_surface_client.h"
@@ skipping 20 matching lines @@
 using testing::_;
 using testing::Mock;
 
 namespace cc {
 namespace {
 
 const gfx::Size kDisplaySize(256, 256);
 const gfx::Rect kOverlayRect(0, 0, 128, 128);
 const gfx::Rect kOverlayTopLeftRect(0, 0, 64, 64);
 const gfx::Rect kOverlayBottomRightRect(64, 64, 64, 64);
+const gfx::Rect kOverlayClipRect(0, 0, 128, 128);
 const gfx::PointF kUVTopLeft(0.1f, 0.2f);
 const gfx::PointF kUVBottomRight(1.0f, 1.0f);
 const gfx::Transform kNormalTransform =
     gfx::Transform(0.9f, 0, 0, 0.8f, 0.1f, 0.2f);  // x,y -> x,y.
 const gfx::Transform kXMirrorTransform =
     gfx::Transform(-0.9f, 0, 0, 0.8f, 1.0f, 0.2f);  // x,y -> 1-x,y.
 const gfx::Transform kYMirrorTransform =
     gfx::Transform(0.9f, 0, 0, -0.8f, 0.1f, 1.0f);  // x,y -> x,1-y.
 const gfx::Transform kBothMirrorTransform =
     gfx::Transform(-0.9f, 0, 0, -0.8f, 1.0f, 1.0f);  // x,y -> 1-x,1-y.
@@ skipping 21 matching lines @@
       EXPECT_EQ(gfx::RectF(kOverlayBottomRightRect), candidate.display_rect);
     } else {
       EXPECT_NEAR(kOverlayRect.x(), candidate.display_rect.x(), 0.01f);
       EXPECT_NEAR(kOverlayRect.y(), candidate.display_rect.y(), 0.01f);
       EXPECT_NEAR(kOverlayRect.width(), candidate.display_rect.width(), 0.01f);
       EXPECT_NEAR(kOverlayRect.height(), candidate.display_rect.height(),
                   0.01f);
     }
     EXPECT_FLOAT_RECT_EQ(BoundingRect(kUVTopLeft, kUVBottomRight),
                          candidate.uv_rect);
+    if (!candidate.clip_rect.IsEmpty()) {
+      EXPECT_EQ(true, candidate.is_clipped);
+      EXPECT_EQ(kOverlayClipRect, candidate.clip_rect);
+    }
     candidate.overlay_handled = true;
   }
 };
 
 class SandwichOverlayValidator : public OverlayCandidateValidator {
  public:
   void GetStrategies(OverlayProcessor::StrategyList* strategies) override {
     strategies->push_back(scoped_ptr<OverlayProcessor::Strategy>(
         new OverlayStrategyCommon(this, new OverlayStrategySandwich)));
   }
@@ skipping 781 matching lines @@
       ->quad_to_target_transform.RotateAboutXAxis(45.f);
 
   RenderPassList pass_list;
   pass_list.push_back(pass.Pass());
   OverlayCandidateList candidate_list;
   overlay_processor_->ProcessForOverlays(&pass_list, &candidate_list);
   ASSERT_EQ(1U, pass_list.size());
   EXPECT_EQ(0U, candidate_list.size());
 }
 
+TEST_F(SingleOverlayOnTopTest, AllowClipped) {
+  scoped_ptr<RenderPass> pass = CreateRenderPass();
+  CreateFullscreenCandidateQuad(resource_provider_.get(),
+                                pass->shared_quad_state_list.back(),
+                                pass.get());
+  pass->shared_quad_state_list.back()->is_clipped = true;
+  pass->shared_quad_state_list.back()->clip_rect = kOverlayClipRect;
+
+  RenderPassList pass_list;
+  pass_list.push_back(pass.Pass());
+  OverlayCandidateList candidate_list;
+  overlay_processor_->ProcessForOverlays(&pass_list, &candidate_list);
+  ASSERT_EQ(1U, pass_list.size());
+  EXPECT_EQ(2U, candidate_list.size());
+}
+
 TEST_F(SingleOverlayOnTopTest, AllowVerticalFlip) {
   gfx::Rect rect = kOverlayRect;
   rect.set_width(rect.width() / 2);
   rect.Offset(0, -rect.height());
   scoped_ptr<RenderPass> pass = CreateRenderPass();
   CreateCandidateQuadAt(resource_provider_.get(),
                         pass->shared_quad_state_list.back(), pass.get(), rect);
   pass->shared_quad_state_list.back()->quad_to_target_transform.Scale(2.0f,
                                                                       -1.0f);
 
@@ skipping 721 matching lines @@
   renderer_->BeginDrawingFrame(&frame_no_overlays);
   renderer_->FinishDrawingFrame(&frame_no_overlays);
   EXPECT_TRUE(resource_provider_->InUseByConsumer(resource1));
   SwapBuffers();
   EXPECT_FALSE(resource_provider_->InUseByConsumer(resource1));
   Mock::VerifyAndClearExpectations(&scheduler_);
 }
 
 }  // namespace
 }  // namespace cc