cc: Find a better prioritized rect when the viewport rect is huge.

cc/resources/picture_layer_tiling_unittest.cc

 // Copyright 2012 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_layer_tiling.h"
 
 #include "cc/test/fake_picture_layer_tiling_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
@@ skipping 403 matching lines @@
 TEST_F(PictureLayerTilingIteratorTest, TilesExist) {
   gfx::Size layer_bounds(1099, 801);
   Initialize(gfx::Size(100, 100), 1.f, layer_bounds);
   VerifyTilesExactlyCoverRect(1.f, gfx::Rect(layer_bounds));
   VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, false));
 
   tiling_->UpdateTilePriorities(
       ACTIVE_TREE,
       layer_bounds,  // device viewport
       gfx::Rect(layer_bounds),  // viewport in layer space
+      gfx::Rect(layer_bounds),  // visible content rect
       layer_bounds,  // last layer bounds
       layer_bounds,  // current layer bounds
       1.f,  // last contents scale
       1.f,  // current contents scale
       gfx::Transform(),  // last screen transform
       gfx::Transform(),  // current screen transform
       1,  // current frame number
       1.0,  // current frame time
       false,  // store screen space quads on tiles
       10000);  // max tiles in tile manager
   VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, true));
 
   // Make the viewport rect empty. All tiles are killed and become zombies.
   tiling_->UpdateTilePriorities(
       ACTIVE_TREE,
       layer_bounds,  // device viewport
       gfx::Rect(),  // viewport in layer space
+      gfx::Rect(),  // visible content rect
       layer_bounds,  // last layer bounds
       layer_bounds,  // current layer bounds
       1.f,  // last contents scale
       1.f,  // current contents scale
       gfx::Transform(),  // last screen transform
       gfx::Transform(),  // current screen transform
       2,  // current frame number
       2.0,  // current frame time
       false,  // store screen space quads on tiles
       10000);  // max tiles in tile manager
   VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, false));
 }
 
+TEST_F(PictureLayerTilingIteratorTest, TilesExistGiantViewport) {
+  gfx::Size layer_bounds(1099, 801);
+  Initialize(gfx::Size(100, 100), 1.f, layer_bounds);
+  VerifyTilesExactlyCoverRect(1.f, gfx::Rect(layer_bounds));
+  VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, false));
+
+  gfx::Rect giant_rect(-10000000, -10000000, 1000000000, 1000000000);
+
+  tiling_->UpdateTilePriorities(
+      ACTIVE_TREE,
+      layer_bounds,  // device viewport
+      giant_rect,  // viewport in layer space
+      gfx::Rect(layer_bounds),  // visible content rect
+      layer_bounds,  // last layer bounds
+      layer_bounds,  // current layer bounds
+      1.f,  // last contents scale
+      1.f,  // current contents scale
+      gfx::Transform(),  // last screen transform
+      gfx::Transform(),  // current screen transform
+      1,  // current frame number
+      1.0,  // current frame time
+      false,  // store screen space quads on tiles
+      10000);  // max tiles in tile manager
+  VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, true));
+
+  // If the visible content rect is empty, it should still have live tiles.
+  tiling_->UpdateTilePriorities(
+      ACTIVE_TREE,
+      layer_bounds,  // device viewport
+      giant_rect,  // viewport in layer space
+      gfx::Rect(),  // visible content rect
+      layer_bounds,  // last layer bounds
+      layer_bounds,  // current layer bounds
+      1.f,  // last contents scale
+      1.f,  // current contents scale
+      gfx::Transform(),  // last screen transform
+      gfx::Transform(),  // current screen transform
+      2,  // current frame number
+      2.0,  // current frame time
+      false,  // store screen space quads on tiles
+      10000);  // max tiles in tile manager
+  VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, true));
+}
+
+TEST_F(PictureLayerTilingIteratorTest, TilesExistOutsideViewport) {
+  gfx::Size layer_bounds(1099, 801);
+  Initialize(gfx::Size(100, 100), 1.f, layer_bounds);
+  VerifyTilesExactlyCoverRect(1.f, gfx::Rect(layer_bounds));
+  VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, false));
+
+  // This rect does not intersect with the layer, as the layer is outside the
+  // viewport.
+  gfx::Rect viewport_rect(1100, 0, 1000, 1000);
+  EXPECT_FALSE(viewport_rect.Intersects(gfx::Rect(layer_bounds)));
+
+  tiling_->UpdateTilePriorities(
+      ACTIVE_TREE,
+      layer_bounds,  // device viewport
+      viewport_rect,  // viewport in layer space
+      gfx::Rect(),  // visible content rect
+      layer_bounds,  // last layer bounds
+      layer_bounds,  // current layer bounds
+      1.f,  // last contents scale
+      1.f,  // current contents scale
+      gfx::Transform(),  // last screen transform
+      gfx::Transform(),  // current screen transform
+      2,  // current frame number
+      2.0,  // current frame time
+      false,  // store screen space quads on tiles
+      10000);  // max tiles in tile manager
+  VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, true));
+}
+
 }  // namespace
 }  // namespace cc