// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#define FML_USED_ON_EMBEDDER

#include "flutter/flow/layers/display_list_layer.h"

#include "flutter/flow/testing/diff_context_test.h"
#include "flutter/fml/macros.h"
#include "flutter/testing/mock_canvas.h"

#ifndef SUPPORT_FRACTIONAL_TRANSLATION
#include "flutter/flow/raster_cache.h"
#endif

namespace flutter {
namespace testing {

using DisplayListLayerTest = LayerTest;

#ifndef NDEBUG
TEST_F(DisplayListLayerTest, PaintBeforePrerollInvalidDisplayListDies) {
  const SkPoint layer_offset = SkPoint::Make(0.0f, 0.0f);
  auto layer = std::make_shared<DisplayListLayer>(
      layer_offset, sk_ref_sp<DisplayList>(nullptr), false, false);

  EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                            "display_list_\\.get\\(\\)");
}

TEST_F(DisplayListLayerTest, PaintBeforePrerollDies) {
  const SkPoint layer_offset = SkPoint::Make(0.0f, 0.0f);
  auto layer = std::make_shared<DisplayListLayer>(
      layer_offset, sk_make_sp<DisplayList>(), false, false);

  EXPECT_EQ(layer->paint_bounds(), SkRect::MakeEmpty());
  EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                            "needs_painting\\(context\\)");
}

TEST_F(DisplayListLayerTest, PaintingEmptyLayerDies) {
  const SkPoint layer_offset = SkPoint::Make(0.0f, 0.0f);
  auto layer = std::make_shared<DisplayListLayer>(
      layer_offset, sk_make_sp<DisplayList>(), false, false);

  layer->Preroll(preroll_context(), SkMatrix());
  EXPECT_EQ(layer->paint_bounds(), SkRect::MakeEmpty());
  EXPECT_FALSE(layer->needs_painting(paint_context()));

  EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                            "needs_painting\\(context\\)");
}

TEST_F(DisplayListLayerTest, InvalidDisplayListDies) {
  const SkPoint layer_offset = SkPoint::Make(0.0f, 0.0f);
  auto layer = std::make_shared<DisplayListLayer>(
      layer_offset, sk_ref_sp<DisplayList>(nullptr), false, false);

  // Crashes reading a nullptr.
  EXPECT_DEATH_IF_SUPPORTED(layer->Preroll(preroll_context(), SkMatrix()), "");
}
#endif

TEST_F(DisplayListLayerTest, SimpleDisplayList) {
  const SkPoint layer_offset = SkPoint::Make(1.5f, -0.5f);
  const SkMatrix layer_offset_matrix =
      SkMatrix::Translate(layer_offset.fX, layer_offset.fY);
  const SkRect picture_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
  DisplayListBuilder builder;
  builder.drawRect(picture_bounds);
  auto display_list = builder.Build();
  auto layer = std::make_shared<DisplayListLayer>(layer_offset, display_list,
                                                  false, false);

  layer->Preroll(preroll_context(), SkMatrix());
  EXPECT_EQ(layer->paint_bounds(),
            picture_bounds.makeOffset(layer_offset.fX, layer_offset.fY));
  EXPECT_EQ(layer->display_list(), display_list.get());
  EXPECT_TRUE(layer->needs_painting(paint_context()));

  layer->Paint(paint_context());
  auto expected_draw_calls = std::vector(
      {MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
       MockCanvas::DrawCall{
           1, MockCanvas::ConcatMatrixData{SkM44(layer_offset_matrix)}},
#ifndef SUPPORT_FRACTIONAL_TRANSLATION
       MockCanvas::DrawCall{
           1, MockCanvas::SetMatrixData{SkM44(
                  RasterCache::GetIntegralTransCTM(layer_offset_matrix))}},
#endif
       MockCanvas::DrawCall{
           1, MockCanvas::DrawRectData{picture_bounds, SkPaint()}},
       MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
  EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
}

#ifdef FLUTTER_ENABLE_DIFF_CONTEXT

using DisplayListLayerDiffTest = DiffContextTest;

TEST_F(DisplayListLayerDiffTest, SimpleDisplayList) {
  auto display_list = CreateDisplayList(SkRect::MakeLTRB(10, 10, 60, 60), 1);

  MockLayerTree tree1;
  tree1.root()->Add(CreateDisplayListLayer(display_list));

  auto damage = DiffLayerTree(tree1, MockLayerTree());
  EXPECT_EQ(damage.frame_damage, SkIRect::MakeLTRB(10, 10, 60, 60));

  MockLayerTree tree2;
  tree2.root()->Add(CreateDisplayListLayer(display_list));

  damage = DiffLayerTree(tree2, tree1);
  EXPECT_TRUE(damage.frame_damage.isEmpty());

  MockLayerTree tree3;
  damage = DiffLayerTree(tree3, tree2);
  EXPECT_EQ(damage.frame_damage, SkIRect::MakeLTRB(10, 10, 60, 60));
}

TEST_F(DisplayListLayerDiffTest, DisplayListCompare) {
  MockLayerTree tree1;
  auto display_list1 = CreateDisplayList(SkRect::MakeLTRB(10, 10, 60, 60), 1);
  tree1.root()->Add(CreateDisplayListLayer(display_list1));

  auto damage = DiffLayerTree(tree1, MockLayerTree());
  EXPECT_EQ(damage.frame_damage, SkIRect::MakeLTRB(10, 10, 60, 60));

  MockLayerTree tree2;
  auto display_list2 = CreateDisplayList(SkRect::MakeLTRB(10, 10, 60, 60), 1);
  tree2.root()->Add(CreateDisplayListLayer(display_list2));

  damage = DiffLayerTree(tree2, tree1);
  EXPECT_EQ(damage.frame_damage, SkIRect::MakeEmpty());

  MockLayerTree tree3;
  auto display_list3 = CreateDisplayList(SkRect::MakeLTRB(10, 10, 60, 60), 1);
  // add offset
  tree3.root()->Add(
      CreateDisplayListLayer(display_list3, SkPoint::Make(10, 10)));

  damage = DiffLayerTree(tree3, tree2);
  EXPECT_EQ(damage.frame_damage, SkIRect::MakeLTRB(10, 10, 70, 70));

  MockLayerTree tree4;
  // different color
  auto display_list4 = CreateDisplayList(SkRect::MakeLTRB(10, 10, 60, 60), 2);
  tree4.root()->Add(
      CreateDisplayListLayer(display_list4, SkPoint::Make(10, 10)));

  damage = DiffLayerTree(tree4, tree3);
  EXPECT_EQ(damage.frame_damage, SkIRect::MakeLTRB(20, 20, 70, 70));
}

#endif

}  // namespace testing
}  // namespace flutter