cc: Apply occlusion before creating quads in TextureLayerImpl.

cc/layers/texture_layer_impl_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/layers/texture_layer_impl.h"
+
+#include "cc/output/context_provider.h"
+#include "cc/output/output_surface.h"
+#include "cc/test/layer_test_common.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+namespace {
+
+void IgnoreCallback(uint32 sync_point, bool lost) {}
+
+TEST(TextureLayerImplTest, Occlusion) {
+  gfx::Size layer_size(1000, 1000);
+  gfx::Size viewport_size(1000, 1000);
+
+  LayerTestCommon::LayerImplTest impl;
+
+  gpu::Mailbox mailbox;
+  impl.output_surface()->context_provider()->ContextGL()->GenMailboxCHROMIUM(
+      mailbox.name);
+  TextureMailbox texture_mailbox(mailbox, GL_TEXTURE_2D, 0);
+
+  bool uses_mailbox = true;
+  TextureLayerImpl* texture_layer_impl =
+      impl.AddChildToRoot<TextureLayerImpl>(uses_mailbox);
+  texture_layer_impl->SetAnchorPoint(gfx::PointF());
+  texture_layer_impl->SetBounds(layer_size);
+  texture_layer_impl->SetContentBounds(layer_size);
+  texture_layer_impl->SetDrawsContent(true);
+  texture_layer_impl->SetTextureMailbox(
+      texture_mailbox,
+      SingleReleaseCallback::Create(base::Bind(&IgnoreCallback)));
+
+  impl.CalcDrawProps(viewport_size);
+
+  {
+    SCOPED_TRACE("No occlusion");
+    gfx::Rect occluded;
+    impl.AppendQuadsWithOcclusion(texture_layer_impl, occluded);
+
+    LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(),
+                                                 gfx::Rect(layer_size));
+    EXPECT_EQ(1u, impl.quad_list().size());
+  }
+
+  {
+    SCOPED_TRACE("Full occlusion");
+    gfx::Rect occluded(texture_layer_impl->visible_content_rect());
+    impl.AppendQuadsWithOcclusion(texture_layer_impl, occluded);
+
+    LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
+    EXPECT_EQ(impl.quad_list().size(), 0u);
+  }
+
+  {
+    SCOPED_TRACE("Partial occlusion");
+    gfx::Rect occluded(200, 0, 800, 1000);
+    impl.AppendQuadsWithOcclusion(texture_layer_impl, occluded);
+
+    size_t partially_occluded_count = 0;
+    LayerTestCommon::VerifyQuadsCoverRectWithOcclusion(
+        impl.quad_list(),
+        gfx::Rect(layer_size),
+        occluded,
+        &partially_occluded_count);
+    // The layer outputs one quad, which is partially occluded.
+    EXPECT_EQ(1u, impl.quad_list().size());
+    EXPECT_EQ(1u, partially_occluded_count);
+  }
+}
+
+}  // namespace
+}  // namespace cc