Update from https://crrev.com/306655

cc/resources/display_item_list_unittest.cc

+// Copyright 2014 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/display_item_list.h"
+
+#include <vector>
+
+#include "cc/resources/clip_display_item.h"
+#include "cc/resources/drawing_display_item.h"
+#include "cc/resources/transform_display_item.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/SkBitmap.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPictureRecorder.h"
+#include "ui/gfx/skia_util.h"
+
+namespace cc {
+namespace {
+
+TEST(DisplayItemListTest, SingleDrawingItem) {
+  gfx::Rect layer_rect(100, 100);
+  SkPictureRecorder recorder;
+  skia::RefPtr<SkCanvas> canvas;
+  skia::RefPtr<SkPicture> picture;
+  SkPaint blue_paint;
+  blue_paint.setColor(SK_ColorBLUE);
+  SkPaint red_paint;
+  red_paint.setColor(SK_ColorRED);
+  unsigned char pixels[4 * 100 * 100] = {0};
+  scoped_refptr<DisplayItemList> list = DisplayItemList::Create();
+
+  canvas = skia::SharePtr(
+      recorder.beginRecording(layer_rect.width(), layer_rect.height()));
+  canvas->drawRectCoords(0.f, 0.f, 60.f, 60.f, red_paint);
+  canvas->drawRectCoords(50.f, 50.f, 75.f, 75.f, blue_paint);
+  picture = skia::AdoptRef(recorder.endRecording());
+  gfx::PointF offset(8.f, 9.f);
+  list->AppendItem(DrawingDisplayItem::Create(picture, offset));
+  DrawDisplayList(pixels, layer_rect, list);
+
+  SkBitmap expected_bitmap;
+  unsigned char expected_pixels[4 * 100 * 100] = {0};
+  SkImageInfo info =
+      SkImageInfo::MakeN32Premul(layer_rect.width(), layer_rect.height());
+  expected_bitmap.installPixels(info, expected_pixels, info.minRowBytes());
+  SkCanvas expected_canvas(expected_bitmap);
+  expected_canvas.clipRect(gfx::RectToSkRect(layer_rect));
+  expected_canvas.drawRectCoords(0.f + offset.x(), 0.f + offset.y(),
+                                 60.f + offset.x(), 60.f + offset.y(),
+                                 red_paint);
+  expected_canvas.drawRectCoords(50.f + offset.x(), 50.f + offset.y(),
+                                 75.f + offset.x(), 75.f + offset.y(),
+                                 blue_paint);
+
+  EXPECT_EQ(0, memcmp(pixels, expected_pixels, 4 * 100 * 100));
+}
+
+TEST(DisplayItemListTest, ClipItem) {
+  gfx::Rect layer_rect(100, 100);
+  SkPictureRecorder recorder;
+  skia::RefPtr<SkCanvas> canvas;
+  skia::RefPtr<SkPicture> picture;
+  SkPaint blue_paint;
+  blue_paint.setColor(SK_ColorBLUE);
+  SkPaint red_paint;
+  red_paint.setColor(SK_ColorRED);
+  unsigned char pixels[4 * 100 * 100] = {0};
+  scoped_refptr<DisplayItemList> list = DisplayItemList::Create();
+
+  canvas = skia::SharePtr(
+      recorder.beginRecording(layer_rect.width(), layer_rect.height()));
+  canvas->drawRectCoords(0.f, 0.f, 60.f, 60.f, red_paint);
+  picture = skia::AdoptRef(recorder.endRecording());
+  gfx::PointF first_offset(8.f, 9.f);
+  list->AppendItem(DrawingDisplayItem::Create(picture, first_offset));
+
+  gfx::Rect clip_rect(60, 60, 10, 10);
+  list->AppendItem(ClipDisplayItem::Create(clip_rect, std::vector<SkRRect>()));
+
+  canvas = skia::SharePtr(
+      recorder.beginRecording(layer_rect.width(), layer_rect.height()));
+  canvas->drawRectCoords(50.f, 50.f, 75.f, 75.f, blue_paint);
+  picture = skia::AdoptRef(recorder.endRecording());
+  gfx::PointF second_offset(2.f, 3.f);
+  list->AppendItem(DrawingDisplayItem::Create(picture, second_offset));
+
+  list->AppendItem(EndClipDisplayItem::Create());
+
+  DrawDisplayList(pixels, layer_rect, list);
+
+  SkBitmap expected_bitmap;
+  unsigned char expected_pixels[4 * 100 * 100] = {0};
+  SkImageInfo info =
+      SkImageInfo::MakeN32Premul(layer_rect.width(), layer_rect.height());
+  expected_bitmap.installPixels(info, expected_pixels, info.minRowBytes());
+  SkCanvas expected_canvas(expected_bitmap);
+  expected_canvas.clipRect(gfx::RectToSkRect(layer_rect));
+  expected_canvas.drawRectCoords(0.f + first_offset.x(), 0.f + first_offset.y(),
+                                 60.f + first_offset.x(),
+                                 60.f + first_offset.y(), red_paint);
+  expected_canvas.clipRect(gfx::RectToSkRect(clip_rect));
+  expected_canvas.drawRectCoords(
+      50.f + second_offset.x(), 50.f + second_offset.y(),
+      75.f + second_offset.x(), 75.f + second_offset.y(), blue_paint);
+
+  EXPECT_EQ(0, memcmp(pixels, expected_pixels, 4 * 100 * 100));
+}
+
+TEST(DisplayItemListTest, TransformItem) {
+  gfx::Rect layer_rect(100, 100);
+  SkPictureRecorder recorder;
+  skia::RefPtr<SkCanvas> canvas;
+  skia::RefPtr<SkPicture> picture;
+  SkPaint blue_paint;
+  blue_paint.setColor(SK_ColorBLUE);
+  SkPaint red_paint;
+  red_paint.setColor(SK_ColorRED);
+  unsigned char pixels[4 * 100 * 100] = {0};
+  scoped_refptr<DisplayItemList> list = DisplayItemList::Create();
+
+  canvas = skia::SharePtr(
+      recorder.beginRecording(layer_rect.width(), layer_rect.height()));
+  canvas->drawRectCoords(0.f, 0.f, 60.f, 60.f, red_paint);
+  picture = skia::AdoptRef(recorder.endRecording());
+  gfx::PointF first_offset(8.f, 9.f);
+  list->AppendItem(DrawingDisplayItem::Create(picture, first_offset));
+
+  gfx::Transform transform;
+  transform.Rotate(45.0);
+  list->AppendItem(TransformDisplayItem::Create(transform));
+
+  canvas = skia::SharePtr(
+      recorder.beginRecording(layer_rect.width(), layer_rect.height()));
+  canvas->drawRectCoords(50.f, 50.f, 75.f, 75.f, blue_paint);
+  picture = skia::AdoptRef(recorder.endRecording());
+  gfx::PointF second_offset(2.f, 3.f);
+  list->AppendItem(DrawingDisplayItem::Create(picture, second_offset));
+
+  list->AppendItem(EndTransformDisplayItem::Create());
+
+  DrawDisplayList(pixels, layer_rect, list);
+
+  SkBitmap expected_bitmap;
+  unsigned char expected_pixels[4 * 100 * 100] = {0};
+  SkImageInfo info =
+      SkImageInfo::MakeN32Premul(layer_rect.width(), layer_rect.height());
+  expected_bitmap.installPixels(info, expected_pixels, info.minRowBytes());
+  SkCanvas expected_canvas(expected_bitmap);
+  expected_canvas.clipRect(gfx::RectToSkRect(layer_rect));
+  expected_canvas.drawRectCoords(0.f + first_offset.x(), 0.f + first_offset.y(),
+                                 60.f + first_offset.x(),
+                                 60.f + first_offset.y(), red_paint);
+  expected_canvas.setMatrix(transform.matrix());
+  expected_canvas.drawRectCoords(
+      50.f + second_offset.x(), 50.f + second_offset.y(),
+      75.f + second_offset.x(), 75.f + second_offset.y(), blue_paint);
+
+  EXPECT_EQ(0, memcmp(pixels, expected_pixels, 4 * 100 * 100));
+}
+
+}  // namespace
+}  // namespace cc