Revert of Revert of Implement DisplayList GatherPixelRefs

cc/resources/display_list_recording_source_unittest.cc

Index: cc/resources/display_list_recording_source_unittest.cc
diff --git a/cc/resources/display_list_recording_source_unittest.cc b/cc/resources/display_list_recording_source_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..45c3b80d79cf2ba386c2fdc85581303559161c3e
--- /dev/null
+++ b/cc/resources/display_list_recording_source_unittest.cc
@@ -0,0 +1,164 @@
+// Copyright 2015 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 <vector>
+
+#include "cc/resources/display_list_raster_source.h"
+#include "cc/test/fake_display_list_recording_source.h"
+#include "cc/test/skia_common.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+namespace {
+
+TEST(DisplayListRecordingSourceTest, DiscardablePixelRefsWithTransform) {
+  gfx::Size grid_cell_size(128, 128);
+  gfx::Rect recorded_viewport(0, 0, 256, 256);
+
+  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
+      FakeDisplayListRecordingSource::CreateRecordingSource(recorded_viewport);
+  recording_source->SetGridCellSize(grid_cell_size);
+  SkBitmap discardable_bitmap[2][2];
+  gfx::Transform identity_transform;
+  CreateBitmap(gfx::Size(32, 32), "discardable", &discardable_bitmap[0][0]);
+  // Translate transform is equivalent to moving using point.
+  gfx::Transform translate_transform;
+  translate_transform.Translate(0, 130);
+  CreateBitmap(gfx::Size(32, 32), "discardable", &discardable_bitmap[1][0]);
+  // This moves the bitmap to center of viewport and rotate, this would make
+  // this bitmap in all four tile grids.
+  gfx::Transform rotate_transform;
+  rotate_transform.Translate(112, 112);
+  rotate_transform.Rotate(45);
+  CreateBitmap(gfx::Size(32, 32), "discardable", &discardable_bitmap[1][1]);
+
+  recording_source->add_draw_bitmap_with_transform(discardable_bitmap[0][0],
+                                                   identity_transform);
+  recording_source->add_draw_bitmap_with_transform(discardable_bitmap[1][0],
+                                                   translate_transform);
+  recording_source->add_draw_bitmap_with_transform(discardable_bitmap[1][1],
+                                                   rotate_transform);
+  recording_source->Rerecord();
+
+  bool can_use_lcd_text = true;
+  scoped_refptr<DisplayListRasterSource> raster_source =
+      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
+          recording_source.get(), can_use_lcd_text);
+
+  // Tile sized iterators. These should find only one pixel ref.
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(0, 0, 128, 128), 1.0, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[0][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[1] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(2u, pixel_refs.size());
+  }
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(0, 0, 256, 256), 2.0, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[0][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[1] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(2u, pixel_refs.size());
+  }
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(0, 0, 64, 64), 0.5, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[0][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[1] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(2u, pixel_refs.size());
+  }
+
+  // Shifted tile sized iterators. These should find only one pixel ref.
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(140, 140, 128, 128), 1.0,
+                                   &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(1u, pixel_refs.size());
+  }
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(280, 280, 256, 256), 2.0,
+                                   &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(1u, pixel_refs.size());
+  }
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(70, 70, 64, 64), 0.5, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(1u, pixel_refs.size());
+  }
+
+  // The rotated bitmap would still be in the top right tile.
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(140, 0, 128, 128), 1.0,
+                                   &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(1u, pixel_refs.size());
+  }
+
+  // Layer sized iterators. These should find all 6 pixel refs, including 1
+  // pixel ref bitmap[0][0], 1 pixel ref for bitmap[1][0], and 4 pixel refs for
+  // bitmap[1][1].
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(0, 0, 256, 256), 1.0, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    // Top left tile with bitmap[0][0] and bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[0][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[1] == discardable_bitmap[1][1].pixelRef());
+    // Top right tile with bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[2] == discardable_bitmap[1][1].pixelRef());
+    // Bottom left tile with bitmap[1][0] and bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[3] == discardable_bitmap[1][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[4] == discardable_bitmap[1][1].pixelRef());
+    // Bottom right tile with bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[5] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(6u, pixel_refs.size());
+  }
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(0, 0, 512, 512), 2.0, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    // Top left tile with bitmap[0][0] and bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[0][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[1] == discardable_bitmap[1][1].pixelRef());
+    // Top right tile with bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[2] == discardable_bitmap[1][1].pixelRef());
+    // Bottom left tile with bitmap[1][0] and bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[3] == discardable_bitmap[1][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[4] == discardable_bitmap[1][1].pixelRef());
+    // Bottom right tile with bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[5] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(6u, pixel_refs.size());
+  }
+  {
+    std::vector<SkPixelRef*> pixel_refs;
+    raster_source->GatherPixelRefs(gfx::Rect(0, 0, 128, 128), 0.5, &pixel_refs);
+    EXPECT_FALSE(pixel_refs.empty());
+    // Top left tile with bitmap[0][0] and bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[0] == discardable_bitmap[0][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[1] == discardable_bitmap[1][1].pixelRef());
+    // Top right tile with bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[2] == discardable_bitmap[1][1].pixelRef());
+    // Bottom left tile with bitmap[1][0] and bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[3] == discardable_bitmap[1][0].pixelRef());
+    EXPECT_TRUE(pixel_refs[4] == discardable_bitmap[1][1].pixelRef());
+    // Bottom right tile with bitmap[1][1].
+    EXPECT_TRUE(pixel_refs[5] == discardable_bitmap[1][1].pixelRef());
+    EXPECT_EQ(6u, pixel_refs.size());
+  }
+}
+
+}  // namespace
+}  // namespace cc