1 files changed, 94 insertions, 0 deletions
diff --git a/chromium/cc/layers/painted_scrollbar_layer_impl_unittest.cc b/chromium/cc/layers/painted_scrollbar_layer_impl_unittest.cc
new file mode 100644
index 00000000000..c45af0326ee
--- /dev/null
+++ b/chromium/cc/layers/painted_scrollbar_layer_impl_unittest.cc
@@ -0,0 +1,94 @@
+// 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/painted_scrollbar_layer_impl.h"
+
+#include "cc/test/layer_test_common.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+namespace {
+
+TEST(PaintedScrollbarLayerImplTest, Occlusion) {
+  gfx::Size layer_size(10, 1000);
+  gfx::Size viewport_size(1000, 1000);
+
+  LayerTestCommon::LayerImplTest impl;
+
+  SkBitmap thumb_sk_bitmap;
+  thumb_sk_bitmap.allocN32Pixels(10, 10);
+  thumb_sk_bitmap.setImmutable();
+  UIResourceId thumb_uid = 5;
+  UIResourceBitmap thumb_bitmap(thumb_sk_bitmap);
+  impl.host_impl()->CreateUIResource(thumb_uid, thumb_bitmap);
+
+  SkBitmap track_sk_bitmap;
+  track_sk_bitmap.allocN32Pixels(10, 10);
+  track_sk_bitmap.setImmutable();
+  UIResourceId track_uid = 6;
+  UIResourceBitmap track_bitmap(track_sk_bitmap);
+  impl.host_impl()->CreateUIResource(track_uid, track_bitmap);
+
+  ScrollbarOrientation orientation = VERTICAL;
+
+  PaintedScrollbarLayerImpl* scrollbar_layer_impl =
+      impl.AddChildToRoot<PaintedScrollbarLayerImpl>(orientation);
+  scrollbar_layer_impl->SetBounds(layer_size);
+  scrollbar_layer_impl->SetContentBounds(layer_size);
+  scrollbar_layer_impl->SetDrawsContent(true);
+  scrollbar_layer_impl->SetThumbThickness(layer_size.width());
+  scrollbar_layer_impl->SetThumbLength(500);
+  scrollbar_layer_impl->SetTrackLength(layer_size.height());
+  scrollbar_layer_impl->SetCurrentPos(100.f / 4);
+  scrollbar_layer_impl->SetMaximum(100);
+  scrollbar_layer_impl->SetVisibleToTotalLengthRatio(1.f / 2);
+  scrollbar_layer_impl->set_track_ui_resource_id(track_uid);
+  scrollbar_layer_impl->set_thumb_ui_resource_id(thumb_uid);
+
+  impl.CalcDrawProps(viewport_size);
+
+  gfx::Rect thumb_rect = scrollbar_layer_impl->ComputeThumbQuadRect();
+  EXPECT_EQ(gfx::Rect(0, 500 / 4, 10, layer_size.height() / 2).ToString(),
+            thumb_rect.ToString());
+
+  {
+    SCOPED_TRACE("No occlusion");
+    gfx::Rect occluded;
+    impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
+
+    size_t partially_occluded_count = 0;
+    LayerTestCommon::VerifyQuadsCoverRectWithOcclusion(
+        impl.quad_list(),
+        gfx::Rect(layer_size),
+        occluded,
+        &partially_occluded_count);
+    EXPECT_EQ(2u, impl.quad_list().size());
+    EXPECT_EQ(0u, partially_occluded_count);
+  }
+
+  {
+    SCOPED_TRACE("Full occlusion");
+    gfx::Rect occluded(scrollbar_layer_impl->visible_content_rect());
+    impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
+
+    LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
+    EXPECT_EQ(impl.quad_list().size(), 0u);
+  }
+
+  {
+    SCOPED_TRACE("Partial occlusion");
+    gfx::Rect occluded(0, 0, 5, 1000);
+    impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
+
+    size_t partially_occluded_count = 0;
+    LayerTestCommon::VerifyQuadsCoverRectWithOcclusion(
+        impl.quad_list(), thumb_rect, occluded, &partially_occluded_count);
+    // The layer outputs two quads, which is partially occluded.
+    EXPECT_EQ(2u, impl.quad_list().size());
+    EXPECT_EQ(2u, partially_occluded_count);
+  }
+}
+
+}  // namespace
+}  // namespace cc