cc: Replace recorded region with direct map lookup

cc/resources/picture_pile_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 <map>
 #include <utility>
 
 #include "cc/resources/picture_pile.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_rendering_stats_instrumentation.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
 namespace {
 
 class TestPicturePile : public PicturePile {
  public:
   using PicturePile::buffer_pixels;
+  using PicturePile::CanRasterSlowTileCheck;
+  using PicturePile::Clear;
 
   PictureMap& picture_map() { return picture_map_; }
 
+  bool CanRasterLayerRect(const gfx::Rect& layer_rect) {
+    return CanRaster(1.f, layer_rect);
+  }
+
   typedef PicturePile::PictureInfo PictureInfo;
   typedef PicturePile::PictureMapKey PictureMapKey;
   typedef PicturePile::PictureMap PictureMap;
 
  protected:
     virtual ~TestPicturePile() {}
 };
 
 class PicturePileTest : public testing::Test {
  public:
@@ skipping 188 matching lines @@
 
       EXPECT_FLOAT_EQ(expected_frequency,
                       picture_info.GetInvalidationFrequencyForTesting());
 
       // We expect that there are pictures everywhere now.
       EXPECT_TRUE(picture_info.GetPicture()) << "i " << i << " j " << j;
     }
   }
 }
 
+TEST_F(PicturePileTest, ClearingInvalidatesRecordedRect) {
+  UpdateWholeLayer();
+
+  gfx::Rect rect(0, 0, 5, 5);
+  EXPECT_TRUE(pile_->CanRasterLayerRect(rect));
+  EXPECT_TRUE(pile_->CanRasterSlowTileCheck(rect));
+
+  pile_->Clear();
+
+  // Make sure both the cache-aware check (using recorded region) and the normal
+  // check are both false after clearing.
+  EXPECT_FALSE(pile_->CanRasterLayerRect(rect));
+  EXPECT_FALSE(pile_->CanRasterSlowTileCheck(rect));
+}
+
+TEST_F(PicturePileTest, FrequentInvalidationCanRaster) {
+  // This test makes sure that if part of the page is frequently invalidated
+  // and doesn't get re-recorded, then CanRaster is not true for any
+  // tiles touching it, but is true for adjacent tiles, even if it
+  // overlaps on borders (edge case).
+  gfx::Size layer_size = gfx::ToFlooredSize(gfx::ScaleSize(pile_->size(), 4.f));
+  pile_->Resize(layer_size);
+
+  gfx::Rect tile01_borders = pile_->tiling().TileBoundsWithBorder(0, 1);
+  gfx::Rect tile02_borders = pile_->tiling().TileBoundsWithBorder(0, 2);
+  gfx::Rect tile01_noborders = pile_->tiling().TileBounds(0, 1);
+  gfx::Rect tile02_noborders = pile_->tiling().TileBounds(0, 2);
+
+  // Sanity check these two tiles are overlapping with borders, since this is
+  // what the test is trying to repro.
+  EXPECT_TRUE(tile01_borders.Intersects(tile02_borders));
+  EXPECT_FALSE(tile01_noborders.Intersects(tile02_noborders));
+  UpdateWholeLayer();
+  EXPECT_TRUE(pile_->CanRasterLayerRect(tile01_noborders));
+  EXPECT_TRUE(pile_->CanRasterSlowTileCheck(tile01_noborders));
+  EXPECT_TRUE(pile_->CanRasterLayerRect(tile02_noborders));
+  EXPECT_TRUE(pile_->CanRasterSlowTileCheck(tile02_noborders));
+
+  // Update the whole layer until the invalidation frequency is high.
+  for (int frame = 0; frame < 33; ++frame) {
+    UpdateWholeLayer();
+  }
+
+  // Update once more with a small viewport.
+  gfx::Rect viewport(0, 0, layer_size.width(), 1);
+  Update(layer_rect(), viewport);
+
+  // Sanity check some pictures exist and others don't.
+  EXPECT_TRUE(pile_->picture_map()
+                  .find(TestPicturePile::PictureMapKey(0, 1))
+                  ->second.GetPicture());
+  EXPECT_FALSE(pile_->picture_map()
+                   .find(TestPicturePile::PictureMapKey(0, 2))
+                   ->second.GetPicture());
+
+  EXPECT_TRUE(pile_->CanRasterLayerRect(tile01_noborders));
+  EXPECT_TRUE(pile_->CanRasterSlowTileCheck(tile01_noborders));
+  EXPECT_FALSE(pile_->CanRasterLayerRect(tile02_noborders));
+  EXPECT_FALSE(pile_->CanRasterSlowTileCheck(tile02_noborders));
+}
+
 }  // namespace
 }  // namespace cc