cc: Inflate invalidation in each picture list

cc/resources/picture_pile_unittest.cc

Index: cc/resources/picture_pile_unittest.cc
diff --git a/cc/resources/picture_pile_unittest.cc b/cc/resources/picture_pile_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ffc7f722bde1fbb8903d5f741197e36ff8159e25
--- /dev/null
+++ b/cc/resources/picture_pile_unittest.cc
@@ -0,0 +1,103 @@
+// 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/resources/picture_pile.h"
+#include "cc/test/fake_content_layer_client.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/rect_conversions.h"
+
+namespace cc {
+namespace {
+
+class TestPicturePile : public PicturePile {
+ public:
+  using PicturePile::buffer_pixels;
+
+  PictureListMap& picture_list_map() { return picture_list_map_; }
+
+  typedef PicturePile::PictureList PictureList;
+  typedef PicturePile::PictureListMapKey PictureListMapKey;
+  typedef PicturePile::PictureListMap PictureListMap;
+
+ protected:
+    virtual ~TestPicturePile() {}
+};
+
+// Update this if the implementation changes.
+const int kBasePictureSize = 3000;
+
+TEST(PicturePileTest, InvalidateOnTileBoundaryInflated) {
+  FakeContentLayerClient client;
+  scoped_refptr<TestPicturePile> pile = new TestPicturePile;
+  SkColor background_color = SK_ColorBLUE;
+
+  float min_scale = 0.125;
+
+  gfx::Size layer_size(kBasePictureSize * 2, kBasePictureSize * 2);
+  pile->Resize(layer_size);
+  pile->SetTileGridSize(gfx::Size(kBasePictureSize, kBasePictureSize));
+  pile->SetMinContentsScale(min_scale);
+
+  // Verify kBasePictureSize matches our expectations. Update kBasePictureSize
+  // if these are wrong.
+  EXPECT_EQ(3, pile->tiling().num_tiles_x());
+  EXPECT_EQ(3, pile->tiling().num_tiles_y());
+  EXPECT_EQ(kBasePictureSize, pile->tiling().max_texture_size().width());
+  EXPECT_EQ(kBasePictureSize, pile->tiling().max_texture_size().height());
+
+  // We should have 1/.125 - 1 = 7 border pixels.
+  EXPECT_EQ(7, pile->buffer_pixels());
+  EXPECT_EQ(7, pile->tiling().border_texels());
+
+  // Update the whole layer.
+  pile->Update(&client,
+               background_color,
+               gfx::Rect(layer_size),
+               gfx::Rect(layer_size),
+               NULL);
+
+  // Invalidate something just over a tile boundary by a single pixel.
+  // This will invalidate the tile (1, 1), as well as 1 row of pixels in (1, 0).
+  gfx::Rect invalidate_rect(
+      pile->tiling().TileBoundsWithBorder(0, 0).right(),
+      pile->tiling().TileBoundsWithBorder(0, 0).bottom() - 1,
+      50,
+      50);
+  pile->Update(&client,
+               background_color,
+               invalidate_rect,
+               gfx::Rect(layer_size),
+               NULL);
+
+  for (int i = 0; i < pile->tiling().num_tiles_x(); ++i) {
+    for (int j = 0; j < pile->tiling().num_tiles_y(); ++j) {
+      // (1, 0) and (1, 1) should be invalidated partially.
+      bool expect_invalidated = i == 1 && (j == 0 || j == 1);
+
+      TestPicturePile::PictureList& picture_list =
+          pile->picture_list_map().find(
+              TestPicturePile::PictureListMapKey(i, j))->second;
+      if (!expect_invalidated) {
+        EXPECT_EQ(1u, picture_list.size()) << "For i,j " << i << "," << j;
+        continue;
+      }
+
+      EXPECT_EQ(2u, picture_list.size()) << "For i,j " << i << "," << j;
+      for (TestPicturePile::PictureList::iterator it = picture_list.begin();
+           it != picture_list.end();
+           ++it) {
+        // The invalidation in each tile should have been made large enough
+        // that scaling it never makes a rect smaller than 1 px wide or tall.
+        scoped_refptr<Picture> picture = *it;
+        gfx::Rect picture_rect = gfx::ToEnclosedRect(
+            gfx::ScaleRect(picture->LayerRect(), min_scale));
+        EXPECT_FALSE(picture_rect.IsEmpty()) << "Picture rect " <<
+            picture_rect.ToString();
+      }
+    }
+  }
+}
+
+}  // namespace
+}  // namespace cc