Compare SkRegion and android::Region performance.

cc/region_unittest.cc

Index: cc/region_unittest.cc
diff --git a/cc/region_unittest.cc b/cc/region_unittest.cc
index c73c5f26dd1209aa1d996e0478422139488b429b..7aacfd4ea5dadf1b307f466fbbbc6ad94095e525 100644
--- a/cc/region_unittest.cc
+++ b/cc/region_unittest.cc
@@ -417,4 +417,53 @@ TEST(RegionTest, IsEmpty) {
   EXPECT_FALSE(SkIRect::MakeXYWH(0, 0, 2, 2).isEmpty());
 }
 
-} // namespace
+}  // namespace
+
+#include "cc/layer.h"
+#include "cc/layer_tree_host_common.h"
+#include "cc/occlusion_tracker.h"
+
+void blah() {
+  static int count = 0;
+  ++count;
+}
+
+namespace {
+TEST(RegionTest, Speed) {
+  scoped_refptr<Layer> root_layer = Layer::create();
+
+  for (int i = 0; i < 10000; ++i) {
+    scoped_refptr<Layer> layer = Layer::create();
+    layer->setIsDrawable(true);
+    layer->setAnchorPoint(gfx::Point());
+    layer->setBounds(gfx::Size(400, 400));
+    layer->setContentsOpaque(true);
+
+    int x = i % 600;
+    int y = 600 - x;
+    layer->setPosition(gfx::Point(x, y));
+
+    root_layer->addChild(layer);
+  }
+
+  Layer::LayerList renderSurfaceLayerList;
+  gfx::Size device_viewport_size(1000, 1000);
+  LayerTreeHostCommon::calculateDrawTransforms(root_layer, device_viewport_size, 1, 1, 1000, renderSurfaceLayerList);
+
+  bool recordMetrics = false;
+  OcclusionTracker occlusionTracker(gfx::Rect(device_viewport_size), recordMetrics);
+  occlusionTracker.setMinimumTrackingSize(gfx::Size());
+
+  typedef LayerIterator<Layer, Layer::LayerList, RenderSurface, LayerIteratorActions::FrontToBack> LayerIteratorType;
+  LayerIteratorType end = LayerIteratorType::end(&renderSurfaceLayerList);
+  for (LayerIteratorType it = LayerIteratorType::begin(&renderSurfaceLayerList); it != end; ++it) {
+    occlusionTracker.enterLayer(it);
+
+    bool occluded = occlusionTracker.occluded(it->renderTarget(), gfx::Rect(it->contentBounds()), it->drawTransform(), true, it->drawableContentRect(), NULL);
+    if (!occluded)
+      blah();
+
+    occlusionTracker.leaveLayer(it);
+  }
+}
+}  // namespace