CC: Tile-size cleanup.

cc/layers/picture_layer_impl_unittest.cc

 // Copyright 2013 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/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <utility>
@@ skipping 4349 matching lines @@
       PicturePileImpl::CreateFromOther(pile);
 
   SetupPendingTree(pending_pile2);
   ActivateTree();
 
   // We've switched to a solid color, so we should end up with no tilings.
   ASSERT_TRUE(active_layer_->tilings());
   EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
 }
 
+class TileSizeSettings : public ImplSidePaintingSettings {
+ public:
+  TileSizeSettings() {
+    default_tile_size = gfx::Size(100, 100);
+    max_untiled_layer_size = gfx::Size(200, 200);
+  }
+};
+
+class TileSizeTest : public PictureLayerImplTest {
+ public:
+  TileSizeTest() : PictureLayerImplTest(TileSizeSettings()) {}
+};
+
+TEST_F(TileSizeTest, TileSizes) {
+  host_impl_.CreatePendingTree();
+
+  LayerTreeImpl* pending_tree = host_impl_.pending_tree();
+  scoped_ptr<FakePictureLayerImpl> layer =
+      FakePictureLayerImpl::Create(pending_tree, id_);
+
+  gfx::Size viewport_size = gfx::Size(1000, 1000);
+  gfx::Size gpu_tile_size = gfx::Size(1000, 250);
+  gfx::Size small_layer_size(42, 42);
+  gfx::Size medium_layer_size(260, 260);
+  gfx::Size large_layer_size(10000, 10000);
+  host_impl_.SetViewportSize(viewport_size);
+  gfx::Size result;
+
+  host_impl_.SetUseGpuRasterization(false);
+
+  // Default tile-size for large layers.
+  result = layer->CalculateTileSize(large_layer_size);
+  EXPECT_EQ(result.width(), 100);
+  EXPECT_EQ(result.height(), 100);
+
+  // Small layers don't tile if under max_untiled_layer_size.
+  // Small layers also round up to multiples of 64.
+  result = layer->CalculateTileSize(small_layer_size);
+  EXPECT_EQ(result.width(), 64);
+  EXPECT_EQ(result.height(), 64);
+
+  host_impl_.SetUseGpuRasterization(true);
+
+  // Gpu-rasterization uses 1/4 viewport-height tiles.
+  result = layer->CalculateTileSize(large_layer_size);
+  EXPECT_EQ(result.width(), gpu_tile_size.width());
+  EXPECT_EQ(result.height(), gpu_tile_size.height());
+
+  // Same as non-gpu small layers.
+  result = layer->CalculateTileSize(small_layer_size);
+  EXPECT_EQ(result.width(), 64);
+  EXPECT_EQ(result.height(), 64);
+
+  // The max untiled size for gpu-raster is 2x a normal tile.
+  // These are also rounded up to multiples of 64.
+  result = layer->CalculateTileSize(medium_layer_size);
+  EXPECT_EQ(result.width(), 320);
+  EXPECT_EQ(result.height(), 320);
+}
+
 }  // namespace
 }  // namespace cc