// Copyright 2017 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 "third_party/blink/renderer/platform/graphics/paint/drawing_display_item.h"

#include "cc/paint/display_item_list.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/geometry/float_rect.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_flags.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_recorder.h"
#include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
#include "third_party/blink/renderer/platform/testing/fake_display_item_client.h"
#include "third_party/skia/include/core/SkTypes.h"

namespace blink {
namespace {

using testing::_;

class DrawingDisplayItemTest : public testing::Test {
 protected:
  FakeDisplayItemClient client_;
};

static sk_sp<PaintRecord> CreateRectRecord(const FloatRect& record_bounds) {
  PaintRecorder recorder;
  cc::PaintCanvas* canvas =
      recorder.beginRecording(record_bounds.Width(), record_bounds.Height());
  canvas->drawRect(record_bounds, PaintFlags());
  return recorder.finishRecordingAsPicture();
}

static sk_sp<PaintRecord> CreateRectRecordWithTranslate(
    const FloatRect& record_bounds,
    float dx,
    float dy) {
  PaintRecorder recorder;
  cc::PaintCanvas* canvas =
      recorder.beginRecording(record_bounds.Width(), record_bounds.Height());
  canvas->save();
  canvas->translate(dx, dy);
  canvas->drawRect(record_bounds, PaintFlags());
  canvas->restore();
  return recorder.finishRecordingAsPicture();
}

TEST_F(DrawingDisplayItemTest, DrawsContent) {
  FloatRect record_bounds(5.5, 6.6, 7.7, 8.8);
  DrawingDisplayItem item(client_, DisplayItem::Type::kDocumentBackground,
                          EnclosingIntRect(record_bounds),
                          CreateRectRecord(record_bounds));
  EXPECT_EQ(EnclosingIntRect(record_bounds), item.VisualRect());
  EXPECT_TRUE(item.DrawsContent());
}

TEST_F(DrawingDisplayItemTest, NullPaintRecord) {
  DrawingDisplayItem item(client_, DisplayItem::Type::kDocumentBackground,
                          IntRect(), nullptr);
  EXPECT_FALSE(item.DrawsContent());
}

TEST_F(DrawingDisplayItemTest, EmptyPaintRecord) {
  DrawingDisplayItem item(client_, DisplayItem::Type::kDocumentBackground,
                          IntRect(), sk_make_sp<PaintRecord>());
  EXPECT_FALSE(item.DrawsContent());
}

TEST_F(DrawingDisplayItemTest, Equals) {
  FloatRect bounds1(100.1, 100.2, 100.3, 100.4);
  DrawingDisplayItem item1(client_, DisplayItem::kDocumentBackground,
                           EnclosingIntRect(bounds1),
                           CreateRectRecord(bounds1));
  DrawingDisplayItem translated(client_, DisplayItem::kDocumentBackground,
                                EnclosingIntRect(bounds1),
                                CreateRectRecordWithTranslate(bounds1, 10, 20));
  // This item contains a DrawingRecord that is different from but visually
  // equivalent to item1's.
  DrawingDisplayItem zero_translated(
      client_, DisplayItem::kDocumentBackground, EnclosingIntRect(bounds1),
      CreateRectRecordWithTranslate(bounds1, 0, 0));

  FloatRect bounds2(100.5, 100.6, 100.7, 100.8);
  DrawingDisplayItem item2(client_, DisplayItem::kDocumentBackground,
                           EnclosingIntRect(bounds1),
                           CreateRectRecord(bounds2));

  DrawingDisplayItem empty_item(client_, DisplayItem::kDocumentBackground,
                                IntRect(), nullptr);

  EXPECT_TRUE(item1.Equals(item1));
  EXPECT_FALSE(item1.Equals(item2));
  EXPECT_FALSE(item1.Equals(translated));
  EXPECT_TRUE(item1.Equals(zero_translated));
  EXPECT_FALSE(item1.Equals(empty_item));

  EXPECT_FALSE(item2.Equals(item1));
  EXPECT_TRUE(item2.Equals(item2));
  EXPECT_FALSE(item2.Equals(translated));
  EXPECT_FALSE(item2.Equals(zero_translated));
  EXPECT_FALSE(item2.Equals(empty_item));

  EXPECT_FALSE(translated.Equals(item1));
  EXPECT_FALSE(translated.Equals(item2));
  EXPECT_TRUE(translated.Equals(translated));
  EXPECT_FALSE(translated.Equals(zero_translated));
  EXPECT_FALSE(translated.Equals(empty_item));

  EXPECT_TRUE(zero_translated.Equals(item1));
  EXPECT_FALSE(zero_translated.Equals(item2));
  EXPECT_FALSE(zero_translated.Equals(translated));
  EXPECT_TRUE(zero_translated.Equals(zero_translated));
  EXPECT_FALSE(zero_translated.Equals(empty_item));

  EXPECT_FALSE(empty_item.Equals(item1));
  EXPECT_FALSE(empty_item.Equals(item2));
  EXPECT_FALSE(empty_item.Equals(translated));
  EXPECT_FALSE(empty_item.Equals(zero_translated));
  EXPECT_TRUE(empty_item.Equals(empty_item));
}

}  // namespace
}  // namespace blink