// 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 "base/memory/scoped_ptr.h"
#include "cc/playback/display_list_raster_source.h"
#include "cc/test/fake_display_list_recording_source.h"
#include "cc/test/skia_common.h"
#include "skia/ext/refptr.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size_conversions.h"

namespace cc {
namespace {

TEST(DisplayListRasterSourceTest, AnalyzeIsSolidUnscaled) {
  gfx::Size layer_bounds(400, 400);

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);

  SkPaint solid_paint;
  SkColor solid_color = SkColorSetARGB(255, 12, 23, 34);
  solid_paint.setColor(solid_color);

  SkColor non_solid_color = SkColorSetARGB(128, 45, 56, 67);
  SkPaint non_solid_paint;
  non_solid_paint.setColor(non_solid_color);

  recording_source->add_draw_rect_with_paint(gfx::Rect(layer_bounds),
                                             solid_paint);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);

  // Ensure everything is solid.
  for (int y = 0; y <= 300; y += 100) {
    for (int x = 0; x <= 300; x += 100) {
      RasterSource::SolidColorAnalysis analysis;
      gfx::Rect rect(x, y, 100, 100);
      raster->PerformSolidColorAnalysis(rect, 1.0, &analysis);
      EXPECT_TRUE(analysis.is_solid_color) << rect.ToString();
      EXPECT_EQ(solid_color, analysis.solid_color) << rect.ToString();
    }
  }

  // Add one non-solid pixel and recreate the raster source.
  recording_source->add_draw_rect_with_paint(gfx::Rect(50, 50, 1, 1),
                                             non_solid_paint);
  recording_source->Rerecord();
  raster = DisplayListRasterSource::CreateFromDisplayListRecordingSource(
      recording_source.get(), false);

  RasterSource::SolidColorAnalysis analysis;
  raster->PerformSolidColorAnalysis(gfx::Rect(0, 0, 100, 100), 1.0, &analysis);
  EXPECT_FALSE(analysis.is_solid_color);

  raster->PerformSolidColorAnalysis(gfx::Rect(100, 0, 100, 100), 1.0,
                                    &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(solid_color, analysis.solid_color);

  // Boundaries should be clipped.
  analysis.is_solid_color = false;
  raster->PerformSolidColorAnalysis(gfx::Rect(350, 0, 100, 100), 1.0,
                                    &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(solid_color, analysis.solid_color);

  analysis.is_solid_color = false;
  raster->PerformSolidColorAnalysis(gfx::Rect(0, 350, 100, 100), 1.0,
                                    &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(solid_color, analysis.solid_color);

  analysis.is_solid_color = false;
  raster->PerformSolidColorAnalysis(gfx::Rect(350, 350, 100, 100), 1.0,
                                    &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(solid_color, analysis.solid_color);
}

TEST(DisplayListRasterSourceTest, AnalyzeIsSolidScaled) {
  gfx::Size layer_bounds(400, 400);

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);

  SkColor solid_color = SkColorSetARGB(255, 12, 23, 34);
  SkPaint solid_paint;
  solid_paint.setColor(solid_color);

  SkColor non_solid_color = SkColorSetARGB(128, 45, 56, 67);
  SkPaint non_solid_paint;
  non_solid_paint.setColor(non_solid_color);

  recording_source->add_draw_rect_with_paint(gfx::Rect(0, 0, 400, 400),
                                             solid_paint);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);

  // Ensure everything is solid.
  for (int y = 0; y <= 30; y += 10) {
    for (int x = 0; x <= 30; x += 10) {
      RasterSource::SolidColorAnalysis analysis;
      gfx::Rect rect(x, y, 10, 10);
      raster->PerformSolidColorAnalysis(rect, 0.1f, &analysis);
      EXPECT_TRUE(analysis.is_solid_color) << rect.ToString();
      EXPECT_EQ(analysis.solid_color, solid_color) << rect.ToString();
    }
  }

  // Add one non-solid pixel and recreate the raster source.
  recording_source->add_draw_rect_with_paint(gfx::Rect(50, 50, 1, 1),
                                             non_solid_paint);
  recording_source->Rerecord();
  raster = DisplayListRasterSource::CreateFromDisplayListRecordingSource(
      recording_source.get(), false);

  RasterSource::SolidColorAnalysis analysis;
  raster->PerformSolidColorAnalysis(gfx::Rect(0, 0, 10, 10), 0.1f, &analysis);
  EXPECT_FALSE(analysis.is_solid_color);

  raster->PerformSolidColorAnalysis(gfx::Rect(10, 0, 10, 10), 0.1f, &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(analysis.solid_color, solid_color);

  // Boundaries should be clipped.
  analysis.is_solid_color = false;
  raster->PerformSolidColorAnalysis(gfx::Rect(35, 0, 10, 10), 0.1f, &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(analysis.solid_color, solid_color);

  analysis.is_solid_color = false;
  raster->PerformSolidColorAnalysis(gfx::Rect(0, 35, 10, 10), 0.1f, &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(analysis.solid_color, solid_color);

  analysis.is_solid_color = false;
  raster->PerformSolidColorAnalysis(gfx::Rect(35, 35, 10, 10), 0.1f, &analysis);
  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(analysis.solid_color, solid_color);
}

TEST(DisplayListRasterSourceTest, AnalyzeIsSolidEmpty) {
  gfx::Size layer_bounds(400, 400);

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);
  RasterSource::SolidColorAnalysis analysis;
  EXPECT_FALSE(analysis.is_solid_color);

  raster->PerformSolidColorAnalysis(gfx::Rect(0, 0, 400, 400), 1.f, &analysis);

  EXPECT_TRUE(analysis.is_solid_color);
  EXPECT_EQ(analysis.solid_color, SkColorSetARGB(0, 0, 0, 0));
}

TEST(DisplayListRasterSourceTest, PixelRefIteratorDiscardableRefsOneTile) {
  gfx::Size layer_bounds(512, 512);

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);

  SkBitmap discardable_bitmap[2][2];
  CreateBitmap(gfx::Size(32, 32), "discardable", &discardable_bitmap[0][0]);
  CreateBitmap(gfx::Size(32, 32), "discardable", &discardable_bitmap[0][1]);
  CreateBitmap(gfx::Size(32, 32), "discardable", &discardable_bitmap[1][1]);

  // Discardable pixel refs are found in the following cells:
  // |---|---|
  // | x | x |
  // |---|---|
  // |   | x |
  // |---|---|
  recording_source->add_draw_bitmap(discardable_bitmap[0][0], gfx::Point(0, 0));
  recording_source->add_draw_bitmap(discardable_bitmap[0][1],
                                    gfx::Point(260, 0));
  recording_source->add_draw_bitmap(discardable_bitmap[1][1],
                                    gfx::Point(260, 260));
  recording_source->SetGatherPixelRefs(true);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);

  // Tile sized iterators. These should find only one pixel ref.
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 0, 256, 256), 1.0, &pixel_refs);
    EXPECT_EQ(1u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[0][0].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(gfx::RectF(32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
  }
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 0, 512, 512), 2.0, &pixel_refs);
    EXPECT_EQ(1u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[0][0].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(gfx::RectF(32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
  }
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 0, 128, 128), 0.5, &pixel_refs);
    EXPECT_EQ(1u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[0][0].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(gfx::RectF(32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
  }
  // Shifted tile sized iterators. These should find only one pixel ref.
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(260, 260, 256, 256), 1.0, &pixel_refs);
    EXPECT_EQ(1u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[1][1].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(gfx::RectF(260, 260, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
  }
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(520, 520, 512, 512), 2.0, &pixel_refs);
    EXPECT_EQ(1u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[1][1].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(gfx::RectF(260, 260, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
  }
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(130, 130, 128, 128), 0.5, &pixel_refs);
    EXPECT_EQ(1u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[1][1].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(gfx::RectF(260, 260, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
  }
  // Ensure there's no discardable pixel refs in the empty cell
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 256, 256, 256), 1.0, &pixel_refs);
    EXPECT_EQ(0u, pixel_refs.size());
  }
  // Layer sized iterators. These should find three pixel ref.
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 0, 512, 512), 1.0, &pixel_refs);
    EXPECT_EQ(3u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[0][0].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(discardable_bitmap[0][1].pixelRef(), pixel_refs[1].pixel_ref);
    EXPECT_EQ(discardable_bitmap[1][1].pixelRef(), pixel_refs[2].pixel_ref);
    EXPECT_EQ(gfx::RectF(32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
    EXPECT_EQ(gfx::RectF(260, 0, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect).ToString());
    EXPECT_EQ(gfx::RectF(260, 260, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect).ToString());
  }
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 0, 1024, 1024), 2.0, &pixel_refs);
    EXPECT_EQ(3u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[0][0].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(discardable_bitmap[0][1].pixelRef(), pixel_refs[1].pixel_ref);
    EXPECT_EQ(discardable_bitmap[1][1].pixelRef(), pixel_refs[2].pixel_ref);
    EXPECT_EQ(gfx::RectF(32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
    EXPECT_EQ(gfx::RectF(260, 0, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect).ToString());
    EXPECT_EQ(gfx::RectF(260, 260, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect).ToString());
  }
  {
    std::vector<skia::PositionPixelRef> pixel_refs;
    raster->GatherPixelRefs(gfx::Rect(0, 0, 256, 256), 0.5, &pixel_refs);
    EXPECT_EQ(3u, pixel_refs.size());
    EXPECT_EQ(discardable_bitmap[0][0].pixelRef(), pixel_refs[0].pixel_ref);
    EXPECT_EQ(discardable_bitmap[0][1].pixelRef(), pixel_refs[1].pixel_ref);
    EXPECT_EQ(discardable_bitmap[1][1].pixelRef(), pixel_refs[2].pixel_ref);
    EXPECT_EQ(gfx::RectF(32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[0].pixel_ref_rect).ToString());
    EXPECT_EQ(gfx::RectF(260, 0, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[1].pixel_ref_rect).ToString());
    EXPECT_EQ(gfx::RectF(260, 260, 32, 32).ToString(),
              gfx::SkRectToRectF(pixel_refs[2].pixel_ref_rect).ToString());
  }
}

TEST(DisplayListRasterSourceTest, RasterFullContents) {
  gfx::Size layer_bounds(3, 5);
  float contents_scale = 1.5f;
  float raster_divisions = 2.f;

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source->SetBackgroundColor(SK_ColorBLACK);
  recording_source->SetClearCanvasWithDebugColor(false);

  // Because the caller sets content opaque, it also promises that it
  // has at least filled in layer_bounds opaquely.
  SkPaint white_paint;
  white_paint.setColor(SK_ColorWHITE);
  recording_source->add_draw_rect_with_paint(gfx::Rect(layer_bounds),
                                             white_paint);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);

  gfx::Size content_bounds(
      gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale)));

  // Simulate drawing into different tiles at different offsets.
  int step_x = std::ceil(content_bounds.width() / raster_divisions);
  int step_y = std::ceil(content_bounds.height() / raster_divisions);
  for (int offset_x = 0; offset_x < content_bounds.width();
       offset_x += step_x) {
    for (int offset_y = 0; offset_y < content_bounds.height();
         offset_y += step_y) {
      gfx::Rect content_rect(offset_x, offset_y, step_x, step_y);
      content_rect.Intersect(gfx::Rect(content_bounds));

      // Simulate a canvas rect larger than the content rect.  Every pixel
      // up to one pixel outside the content rect is guaranteed to be opaque.
      // Outside of that is undefined.
      gfx::Rect canvas_rect(content_rect);
      canvas_rect.Inset(0, 0, -1, -1);

      SkBitmap bitmap;
      bitmap.allocN32Pixels(canvas_rect.width(), canvas_rect.height());
      SkCanvas canvas(bitmap);
      canvas.clear(SK_ColorTRANSPARENT);

      raster->PlaybackToCanvas(&canvas, canvas_rect, canvas_rect,
                               contents_scale);

      SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
      int num_pixels = bitmap.width() * bitmap.height();
      bool all_white = true;
      for (int i = 0; i < num_pixels; ++i) {
        EXPECT_EQ(SkColorGetA(pixels[i]), 255u);
        all_white &= (SkColorGetR(pixels[i]) == 255);
        all_white &= (SkColorGetG(pixels[i]) == 255);
        all_white &= (SkColorGetB(pixels[i]) == 255);
      }

      // If the canvas doesn't extend past the edge of the content,
      // it should be entirely white. Otherwise, the edge of the content
      // will be non-white.
      EXPECT_EQ(all_white, gfx::Rect(content_bounds).Contains(canvas_rect));
    }
  }
}

TEST(DisplayListRasterSourceTest, RasterPartialContents) {
  gfx::Size layer_bounds(3, 5);
  float contents_scale = 1.5f;

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source->SetBackgroundColor(SK_ColorGREEN);
  recording_source->SetClearCanvasWithDebugColor(false);

  // First record everything as white.
  SkPaint white_paint;
  white_paint.setColor(SK_ColorWHITE);
  recording_source->add_draw_rect_with_paint(gfx::Rect(layer_bounds),
                                             white_paint);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);

  gfx::Size content_bounds(
      gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale)));

  SkBitmap bitmap;
  bitmap.allocN32Pixels(content_bounds.width(), content_bounds.height());
  SkCanvas canvas(bitmap);
  canvas.clear(SK_ColorTRANSPARENT);

  // Playback the full rect which should make everything white.
  gfx::Rect raster_full_rect(content_bounds);
  gfx::Rect playback_rect(content_bounds);
  raster->PlaybackToCanvas(&canvas, raster_full_rect, playback_rect,
                           contents_scale);

  {
    SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
    for (int i = 0; i < bitmap.width(); ++i) {
      for (int j = 0; j < bitmap.height(); ++j) {
        SCOPED_TRACE(i);
        SCOPED_TRACE(j);
        EXPECT_EQ(255u, SkColorGetA(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(255u, SkColorGetR(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(255u, SkColorGetG(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(255u, SkColorGetB(pixels[i + j * bitmap.width()]));
      }
    }
  }

  // Re-record everything as black.
  SkPaint black_paint;
  black_paint.setColor(SK_ColorBLACK);
  recording_source->add_draw_rect_with_paint(gfx::Rect(layer_bounds),
                                             black_paint);
  recording_source->Rerecord();

  // Make a new RasterSource from the new recording.
  raster = DisplayListRasterSource::CreateFromDisplayListRecordingSource(
      recording_source.get(), false);

  // We're going to playback from "everything is black" into a smaller area,
  // that touches the edge pixels of the recording.
  playback_rect.Inset(1, 2, 0, 1);
  raster->PlaybackToCanvas(&canvas, raster_full_rect, playback_rect,
                           contents_scale);

  SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
  int num_black = 0;
  int num_white = 0;
  for (int i = 0; i < bitmap.width(); ++i) {
    for (int j = 0; j < bitmap.height(); ++j) {
      SCOPED_TRACE(j);
      SCOPED_TRACE(i);
      bool expect_black = playback_rect.Contains(i, j);
      if (expect_black) {
        EXPECT_EQ(255u, SkColorGetA(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(0u, SkColorGetR(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(0u, SkColorGetG(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(0u, SkColorGetB(pixels[i + j * bitmap.width()]));
        ++num_black;
      } else {
        EXPECT_EQ(255u, SkColorGetA(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(255u, SkColorGetR(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(255u, SkColorGetG(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(255u, SkColorGetB(pixels[i + j * bitmap.width()]));
        ++num_white;
      }
    }
  }
  EXPECT_GT(num_black, 0);
  EXPECT_GT(num_white, 0);
}

TEST(DisplayListRasterSourceTest, RasterPartialClear) {
  gfx::Size layer_bounds(3, 5);
  gfx::Size partial_bounds(2, 4);
  float contents_scale = 1.5f;

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source->SetBackgroundColor(SK_ColorGREEN);
  recording_source->SetRequiresClear(true);
  recording_source->SetClearCanvasWithDebugColor(false);

  // First record everything as white.
  const unsigned alpha_dark = 10u;
  SkPaint white_paint;
  white_paint.setColor(SK_ColorWHITE);
  white_paint.setAlpha(alpha_dark);
  recording_source->add_draw_rect_with_paint(gfx::Rect(layer_bounds),
                                             white_paint);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);

  gfx::Size content_bounds(
      gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale)));

  SkBitmap bitmap;
  bitmap.allocN32Pixels(content_bounds.width(), content_bounds.height());
  SkCanvas canvas(bitmap);
  canvas.clear(SK_ColorTRANSPARENT);

  // Playback the full rect which should make everything light gray (alpha=10).
  gfx::Rect raster_full_rect(content_bounds);
  gfx::Rect playback_rect(content_bounds);
  raster->PlaybackToCanvas(&canvas, raster_full_rect, playback_rect,
                           contents_scale);

  {
    SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
    for (int i = 0; i < bitmap.width(); ++i) {
      for (int j = 0; j < bitmap.height(); ++j) {
        SCOPED_TRACE(i);
        SCOPED_TRACE(j);
        EXPECT_EQ(alpha_dark, SkColorGetA(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(alpha_dark, SkColorGetR(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(alpha_dark, SkColorGetG(pixels[i + j * bitmap.width()]));
        EXPECT_EQ(alpha_dark, SkColorGetB(pixels[i + j * bitmap.width()]));
      }
    }
  }

  scoped_ptr<FakeDisplayListRecordingSource> recording_source_light =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source_light->SetBackgroundColor(SK_ColorGREEN);
  recording_source_light->SetRequiresClear(true);
  recording_source_light->SetClearCanvasWithDebugColor(false);

  // Record everything as a slightly lighter white.
  const unsigned alpha_light = 18u;
  white_paint.setAlpha(alpha_light);
  recording_source_light->add_draw_rect_with_paint(gfx::Rect(layer_bounds),
                                                   white_paint);
  recording_source_light->Rerecord();

  // Make a new RasterSource from the new recording.
  raster = DisplayListRasterSource::CreateFromDisplayListRecordingSource(
      recording_source_light.get(), false);

  // We're going to playback from alpha(18) white rectangle into a smaller area
  // of the recording resulting in a smaller lighter white rectangle over a
  // darker white background rectangle.
  playback_rect = gfx::Rect(
      gfx::ToCeiledSize(gfx::ScaleSize(partial_bounds, contents_scale)));
  raster->PlaybackToCanvas(&canvas, raster_full_rect, playback_rect,
                           contents_scale);

  // Test that the whole playback_rect was cleared and repainted with new alpha.
  SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
  for (int i = 0; i < playback_rect.width(); ++i) {
    for (int j = 0; j < playback_rect.height(); ++j) {
      SCOPED_TRACE(j);
      SCOPED_TRACE(i);
      EXPECT_EQ(alpha_light, SkColorGetA(pixels[i + j * bitmap.width()]));
      EXPECT_EQ(alpha_light, SkColorGetR(pixels[i + j * bitmap.width()]));
      EXPECT_EQ(alpha_light, SkColorGetG(pixels[i + j * bitmap.width()]));
      EXPECT_EQ(alpha_light, SkColorGetB(pixels[i + j * bitmap.width()]));
    }
  }
}

TEST(DisplayListRasterSourceTest, RasterContentsTransparent) {
  gfx::Size layer_bounds(5, 3);
  float contents_scale = 0.5f;

  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source->SetBackgroundColor(SK_ColorTRANSPARENT);
  recording_source->SetRequiresClear(true);
  recording_source->SetClearCanvasWithDebugColor(false);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);
  gfx::Size content_bounds(
      gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale)));

  gfx::Rect canvas_rect(content_bounds);
  canvas_rect.Inset(0, 0, -1, -1);

  SkBitmap bitmap;
  bitmap.allocN32Pixels(canvas_rect.width(), canvas_rect.height());
  SkCanvas canvas(bitmap);

  raster->PlaybackToCanvas(&canvas, canvas_rect, canvas_rect, contents_scale);

  SkColor* pixels = reinterpret_cast<SkColor*>(bitmap.getPixels());
  int num_pixels = bitmap.width() * bitmap.height();
  for (int i = 0; i < num_pixels; ++i) {
    EXPECT_EQ(SkColorGetA(pixels[i]), 0u);
  }
}

TEST(DisplayListRasterSourceTest,
     GetPictureMemoryUsageIncludesClientReportedMemory) {
  const size_t kReportedMemoryUsageInBytes = 100 * 1024 * 1024;
  gfx::Size layer_bounds(5, 3);
  scoped_ptr<FakeDisplayListRecordingSource> recording_source =
      FakeDisplayListRecordingSource::CreateFilledRecordingSource(layer_bounds);
  recording_source->set_reported_memory_usage(kReportedMemoryUsageInBytes);
  recording_source->Rerecord();

  scoped_refptr<DisplayListRasterSource> raster =
      DisplayListRasterSource::CreateFromDisplayListRecordingSource(
          recording_source.get(), false);
  size_t total_memory_usage = raster->GetPictureMemoryUsage();
  EXPECT_GE(total_memory_usage, kReportedMemoryUsageInBytes);
  EXPECT_LT(total_memory_usage, 2 * kReportedMemoryUsageInBytes);
}

}  // namespace
}  // namespace cc