flow/layers/opacity_layer_unittests.cc - external/github.com/flutter/engine - Git at Google

 // 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.

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

 #include "flutter/flow/layers/clip_rect_layer.h"
 #include "flutter/flow/testing/layer_test.h"
 #include "flutter/flow/testing/mock_layer.h"
 #include "flutter/fml/macros.h"
 #include "flutter/testing/mock_canvas.h"

 namespace flutter {
 namespace testing {

 using OpacityLayerTest = LayerTest;

 #ifndef NDEBUG
 TEST_F(OpacityLayerTest, LeafLayer) {
   auto layer =
       std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, SkPoint::Make(0.0f, 0.0f));

   EXPECT_DEATH_IF_SUPPORTED(layer->Preroll(preroll_context(), SkMatrix()),
                             "\\!container->layers\\(\\)\\.empty\\(\\)");
 }

 TEST_F(OpacityLayerTest, PaintingEmptyLayerDies) {
   auto mock_layer = std::make_shared<MockLayer>(SkPath());
   auto layer =
       std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, SkPoint::Make(0.0f, 0.0f));
   layer->Add(mock_layer);

   layer->Preroll(preroll_context(), SkMatrix());
   EXPECT_EQ(mock_layer->paint_bounds(), SkPath().getBounds());
   EXPECT_EQ(layer->paint_bounds(), mock_layer->paint_bounds());
   EXPECT_FALSE(mock_layer->needs_painting());
   EXPECT_FALSE(layer->needs_painting());

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

 TEST_F(OpacityLayerTest, PaintBeforePreollDies) {
   SkPath child_path;
   child_path.addRect(5.0f, 6.0f, 20.5f, 21.5f);
   auto mock_layer = std::make_shared<MockLayer>(child_path);
   auto layer =
       std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, SkPoint::Make(0.0f, 0.0f));
   layer->Add(mock_layer);

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

 TEST_F(OpacityLayerTest, FullyOpaque) {
   const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
   const SkPoint layer_offset = SkPoint::Make(0.5f, 1.5f);
   const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
   const SkMatrix layer_transform =
       SkMatrix::MakeTrans(layer_offset.fX, layer_offset.fY);
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
   const SkMatrix integral_layer_transform = RasterCache::GetIntegralTransCTM(
       SkMatrix::Concat(initial_transform, layer_transform));
 #endif
   const SkPaint child_paint = SkPaint(SkColors::kGreen);
   const SkRect expected_layer_bounds =
       layer_transform.mapRect(child_path.getBounds());
   auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
   auto layer = std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, layer_offset);
   layer->Add(mock_layer);

   layer->Preroll(preroll_context(), initial_transform);
   EXPECT_EQ(mock_layer->paint_bounds(), child_path.getBounds());
   EXPECT_EQ(layer->paint_bounds(), expected_layer_bounds);
   EXPECT_TRUE(mock_layer->needs_painting());
   EXPECT_TRUE(layer->needs_painting());
   EXPECT_EQ(mock_layer->parent_matrix(),
             SkMatrix::Concat(initial_transform, layer_transform));
   EXPECT_EQ(mock_layer->parent_mutators(),
             std::vector({Mutator(layer_transform), Mutator(SK_AlphaOPAQUE)}));

   const SkPaint opacity_paint = SkPaint(SkColors::kBlack);  // A = 1.0f
   SkRect opacity_bounds;
   expected_layer_bounds.makeOffset(-layer_offset.fX, -layer_offset.fY)
       .roundOut(&opacity_bounds);
   auto expected_draw_calls = std::vector(
       {MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
        MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer_transform}},
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
        MockCanvas::DrawCall{
            1, MockCanvas::SetMatrixData{integral_layer_transform}},
 #endif
        MockCanvas::DrawCall{
            1, MockCanvas::SaveLayerData{opacity_bounds, opacity_paint, nullptr,
                                         2}},
        MockCanvas::DrawCall{2,
                             MockCanvas::DrawPathData{child_path, child_paint}},
        MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
        MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
   layer->Paint(paint_context());
   EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
 }

 TEST_F(OpacityLayerTest, FullyTransparent) {
   const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
   const SkPoint layer_offset = SkPoint::Make(0.5f, 1.5f);
   const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
   const SkMatrix layer_transform =
       SkMatrix::MakeTrans(layer_offset.fX, layer_offset.fY);
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
   const SkMatrix integral_layer_transform = RasterCache::GetIntegralTransCTM(
       SkMatrix::Concat(initial_transform, layer_transform));
 #endif
   const SkPaint child_paint = SkPaint(SkColors::kGreen);
   const SkRect expected_layer_bounds =
       layer_transform.mapRect(child_path.getBounds());
   auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
   auto layer =
       std::make_shared<OpacityLayer>(SK_AlphaTRANSPARENT, layer_offset);
   layer->Add(mock_layer);

   layer->Preroll(preroll_context(), initial_transform);
   EXPECT_EQ(mock_layer->paint_bounds(), child_path.getBounds());
   EXPECT_EQ(layer->paint_bounds(), expected_layer_bounds);
   EXPECT_TRUE(mock_layer->needs_painting());
   EXPECT_TRUE(layer->needs_painting());
   EXPECT_EQ(mock_layer->parent_matrix(),
             SkMatrix::Concat(initial_transform, layer_transform));
   EXPECT_EQ(
       mock_layer->parent_mutators(),
       std::vector({Mutator(layer_transform), Mutator(SK_AlphaTRANSPARENT)}));

   auto expected_draw_calls = std::vector(
       {MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
        MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer_transform}},
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
        MockCanvas::DrawCall{
            1, MockCanvas::SetMatrixData{integral_layer_transform}},
 #endif
        MockCanvas::DrawCall{1, MockCanvas::SaveData{2}},
        MockCanvas::DrawCall{
            2, MockCanvas::ClipRectData{kEmptyRect, SkClipOp::kIntersect,
                                        MockCanvas::kHard_ClipEdgeStyle}},
        MockCanvas::DrawCall{2,
                             MockCanvas::DrawPathData{child_path, child_paint}},
        MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
        MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
   layer->Paint(paint_context());
   EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
 }

 TEST_F(OpacityLayerTest, HalfTransparent) {
   const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
   const SkPoint layer_offset = SkPoint::Make(0.5f, 1.5f);
   const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
   const SkMatrix layer_transform =
       SkMatrix::MakeTrans(layer_offset.fX, layer_offset.fY);
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
   const SkMatrix integral_layer_transform = RasterCache::GetIntegralTransCTM(
       SkMatrix::Concat(initial_transform, layer_transform));
 #endif
   const SkPaint child_paint = SkPaint(SkColors::kGreen);
   const SkRect expected_layer_bounds =
       layer_transform.mapRect(child_path.getBounds());
   const SkAlpha alpha_half = 255 / 2;
   auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
   auto layer = std::make_shared<OpacityLayer>(alpha_half, layer_offset);
   layer->Add(mock_layer);

   layer->Preroll(preroll_context(), initial_transform);
   EXPECT_EQ(mock_layer->paint_bounds(), child_path.getBounds());
   EXPECT_EQ(layer->paint_bounds(), expected_layer_bounds);
   EXPECT_TRUE(mock_layer->needs_painting());
   EXPECT_TRUE(layer->needs_painting());
   EXPECT_EQ(mock_layer->parent_matrix(),
             SkMatrix::Concat(initial_transform, layer_transform));
   EXPECT_EQ(mock_layer->parent_mutators(),
             std::vector({Mutator(layer_transform), Mutator(alpha_half)}));

   const SkPaint opacity_paint =
       SkPaint(SkColor4f::FromColor(SkColorSetA(SK_ColorBLACK, alpha_half)));
   SkRect opacity_bounds;
   expected_layer_bounds.makeOffset(-layer_offset.fX, -layer_offset.fY)
       .roundOut(&opacity_bounds);
   auto expected_draw_calls = std::vector(
       {MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
        MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer_transform}},
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
        MockCanvas::DrawCall{
            1, MockCanvas::SetMatrixData{integral_layer_transform}},
 #endif
        MockCanvas::DrawCall{
            1, MockCanvas::SaveLayerData{opacity_bounds, opacity_paint, nullptr,
                                         2}},
        MockCanvas::DrawCall{2,
                             MockCanvas::DrawPathData{child_path, child_paint}},
        MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
        MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
   layer->Paint(paint_context());
   EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
 }

 TEST_F(OpacityLayerTest, Nested) {
   const SkPath child1_path = SkPath().addRect(SkRect::MakeWH(5.0f, 6.0f));
   const SkPath child2_path = SkPath().addRect(SkRect::MakeWH(2.0f, 7.0f));
   const SkPath child3_path = SkPath().addRect(SkRect::MakeWH(6.0f, 6.0f));
   const SkPoint layer1_offset = SkPoint::Make(0.5f, 1.5f);
   const SkPoint layer2_offset = SkPoint::Make(2.5f, 0.5f);
   const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
   const SkMatrix layer1_transform =
       SkMatrix::MakeTrans(layer1_offset.fX, layer1_offset.fY);
   const SkMatrix layer2_transform =
       SkMatrix::MakeTrans(layer2_offset.fX, layer2_offset.fY);
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
   const SkMatrix integral_layer1_transform = RasterCache::GetIntegralTransCTM(
       SkMatrix::Concat(initial_transform, layer1_transform));
   const SkMatrix integral_layer2_transform = RasterCache::GetIntegralTransCTM(
       SkMatrix::Concat(SkMatrix::Concat(initial_transform, layer1_transform),
                        layer2_transform));
 #endif
   const SkPaint child1_paint = SkPaint(SkColors::kRed);
   const SkPaint child2_paint = SkPaint(SkColors::kBlue);
   const SkPaint child3_paint = SkPaint(SkColors::kGreen);
   const SkAlpha alpha1 = 155;
   const SkAlpha alpha2 = 224;
   auto mock_layer1 = std::make_shared<MockLayer>(child1_path, child1_paint);
   auto mock_layer2 = std::make_shared<MockLayer>(child2_path, child2_paint);
   auto mock_layer3 = std::make_shared<MockLayer>(child3_path, child3_paint);
   auto layer1 = std::make_shared<OpacityLayer>(alpha1, layer1_offset);
   auto layer2 = std::make_shared<OpacityLayer>(alpha2, layer2_offset);
   layer2->Add(mock_layer2);
   layer1->Add(mock_layer1);
   layer1->Add(layer2);
   layer1->Add(mock_layer3);  // Ensure something is processed after recursion

   const SkRect expected_layer2_bounds =
       layer2_transform.mapRect(child2_path.getBounds());
   SkRect expected_layer1_bounds = expected_layer2_bounds;
   expected_layer1_bounds.join(child1_path.getBounds());
   expected_layer1_bounds.join(child3_path.getBounds());
   expected_layer1_bounds = layer1_transform.mapRect(expected_layer1_bounds);
   layer1->Preroll(preroll_context(), initial_transform);
   EXPECT_EQ(mock_layer1->paint_bounds(), child1_path.getBounds());
   EXPECT_EQ(mock_layer2->paint_bounds(), child2_path.getBounds());
   EXPECT_EQ(mock_layer3->paint_bounds(), child3_path.getBounds());
   EXPECT_EQ(layer1->paint_bounds(), expected_layer1_bounds);
   EXPECT_EQ(layer2->paint_bounds(), expected_layer2_bounds);
   EXPECT_TRUE(mock_layer1->needs_painting());
   EXPECT_TRUE(mock_layer2->needs_painting());
   EXPECT_TRUE(mock_layer3->needs_painting());
   EXPECT_TRUE(layer1->needs_painting());
   EXPECT_TRUE(layer2->needs_painting());
   EXPECT_EQ(mock_layer1->parent_matrix(),
             SkMatrix::Concat(initial_transform, layer1_transform));
   //   EXPECT_EQ(mock_layer1->parent_mutators(),
   //             std::vector({Mutator(layer1_transform), Mutator(alpha1)}));
   EXPECT_EQ(
       mock_layer2->parent_matrix(),
       SkMatrix::Concat(SkMatrix::Concat(initial_transform, layer1_transform),
                        layer2_transform));
   //   EXPECT_EQ(mock_layer2->parent_mutators(),
   //             std::vector({Mutator(layer1_transform), Mutator(alpha1),
   //                          Mutator(layer2_transform), Mutator(alpha2)}));
   EXPECT_EQ(mock_layer3->parent_matrix(),
             SkMatrix::Concat(initial_transform, layer1_transform));
   //   EXPECT_EQ(mock_layer3->parent_mutators(),
   //             std::vector({Mutator(layer1_transform), Mutator(alpha1)}));

   const SkPaint opacity1_paint =
       SkPaint(SkColor4f::FromColor(SkColorSetA(SK_ColorBLACK, alpha1)));
   const SkPaint opacity2_paint =
       SkPaint(SkColor4f::FromColor(SkColorSetA(SK_ColorBLACK, alpha2)));
   SkRect opacity1_bounds, opacity2_bounds;
   expected_layer1_bounds.makeOffset(-layer1_offset.fX, -layer1_offset.fY)
       .roundOut(&opacity1_bounds);
   expected_layer2_bounds.makeOffset(-layer2_offset.fX, -layer2_offset.fY)
       .roundOut(&opacity2_bounds);
   auto expected_draw_calls = std::vector(
       {MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
        MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer1_transform}},
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
        MockCanvas::DrawCall{
            1, MockCanvas::SetMatrixData{integral_layer1_transform}},
 #endif
        MockCanvas::DrawCall{
            1, MockCanvas::SaveLayerData{opacity1_bounds, opacity1_paint,
                                         nullptr, 2}},
        MockCanvas::DrawCall{
            2, MockCanvas::DrawPathData{child1_path, child1_paint}},
        MockCanvas::DrawCall{2, MockCanvas::SaveData{3}},
        MockCanvas::DrawCall{3, MockCanvas::ConcatMatrixData{layer2_transform}},
 #ifndef SUPPORT_FRACTIONAL_TRANSLATION
        MockCanvas::DrawCall{
            3, MockCanvas::SetMatrixData{integral_layer2_transform}},
 #endif
        MockCanvas::DrawCall{
            3, MockCanvas::SaveLayerData{opacity2_bounds, opacity2_paint,
                                         nullptr, 4}},
        MockCanvas::DrawCall{
            4, MockCanvas::DrawPathData{child2_path, child2_paint}},
        MockCanvas::DrawCall{4, MockCanvas::RestoreData{3}},
        MockCanvas::DrawCall{3, MockCanvas::RestoreData{2}},
        MockCanvas::DrawCall{
            2, MockCanvas::DrawPathData{child3_path, child3_paint}},
        MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
        MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
   layer1->Paint(paint_context());
   EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
 }

 TEST_F(OpacityLayerTest, Readback) {
   auto initial_transform = SkMatrix();
   auto layer = std::make_shared<OpacityLayer>(kOpaque_SkAlphaType, SkPoint());
   layer->Add(std::make_shared<MockLayer>(SkPath()));

   // OpacityLayer does not read from surface
   preroll_context()->surface_needs_readback = false;
   layer->Preroll(preroll_context(), initial_transform);
   EXPECT_FALSE(preroll_context()->surface_needs_readback);

   // OpacityLayer blocks child with readback
   auto mock_layer =
       std::make_shared<MockLayer>(SkPath(), SkPaint(), false, false, true);
   layer->Add(mock_layer);
   preroll_context()->surface_needs_readback = false;
   layer->Preroll(preroll_context(), initial_transform);
   EXPECT_FALSE(preroll_context()->surface_needs_readback);
 }

 TEST_F(OpacityLayerTest, CullRectIsTransformed) {
   auto clipRectLayer = std::make_shared<ClipRectLayer>(
       SkRect::MakeLTRB(0, 0, 10, 10), flutter::hardEdge);
   auto opacityLayer =
       std::make_shared<OpacityLayer>(128, SkPoint::Make(20, 20));
   auto mockLayer = std::make_shared<MockLayer>(SkPath());
   clipRectLayer->Add(opacityLayer);
   opacityLayer->Add(mockLayer);
   clipRectLayer->Preroll(preroll_context(), SkMatrix::I());
   EXPECT_EQ(mockLayer->parent_cull_rect().fLeft, -20);
   EXPECT_EQ(mockLayer->parent_cull_rect().fTop, -20);
 }

 }  // namespace testing
 }  // namespace flutter
	// 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.

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

	#include "flutter/flow/layers/clip_rect_layer.h"
	#include "flutter/flow/testing/layer_test.h"
	#include "flutter/flow/testing/mock_layer.h"
	#include "flutter/fml/macros.h"
	#include "flutter/testing/mock_canvas.h"

	namespace flutter {
	namespace testing {

	using OpacityLayerTest = LayerTest;

	#ifndef NDEBUG
	TEST_F(OpacityLayerTest, LeafLayer) {
	auto layer =
	std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, SkPoint::Make(0.0f, 0.0f));

	EXPECT_DEATH_IF_SUPPORTED(layer->Preroll(preroll_context(), SkMatrix()),
	"\\!container->layers\\(\\)\\.empty\\(\\)");
	}

	TEST_F(OpacityLayerTest, PaintingEmptyLayerDies) {
	auto mock_layer = std::make_shared<MockLayer>(SkPath());
	auto layer =
	std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, SkPoint::Make(0.0f, 0.0f));
	layer->Add(mock_layer);

	layer->Preroll(preroll_context(), SkMatrix());
	EXPECT_EQ(mock_layer->paint_bounds(), SkPath().getBounds());
	EXPECT_EQ(layer->paint_bounds(), mock_layer->paint_bounds());
	EXPECT_FALSE(mock_layer->needs_painting());
	EXPECT_FALSE(layer->needs_painting());

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

	TEST_F(OpacityLayerTest, PaintBeforePreollDies) {
	SkPath child_path;
	child_path.addRect(5.0f, 6.0f, 20.5f, 21.5f);
	auto mock_layer = std::make_shared<MockLayer>(child_path);
	auto layer =
	std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, SkPoint::Make(0.0f, 0.0f));
	layer->Add(mock_layer);

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

	TEST_F(OpacityLayerTest, FullyOpaque) {
	const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
	const SkPoint layer_offset = SkPoint::Make(0.5f, 1.5f);
	const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
	const SkMatrix layer_transform =
	SkMatrix::MakeTrans(layer_offset.fX, layer_offset.fY);
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	const SkMatrix integral_layer_transform = RasterCache::GetIntegralTransCTM(
	SkMatrix::Concat(initial_transform, layer_transform));
	#endif
	const SkPaint child_paint = SkPaint(SkColors::kGreen);
	const SkRect expected_layer_bounds =
	layer_transform.mapRect(child_path.getBounds());
	auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
	auto layer = std::make_shared<OpacityLayer>(SK_AlphaOPAQUE, layer_offset);
	layer->Add(mock_layer);

	layer->Preroll(preroll_context(), initial_transform);
	EXPECT_EQ(mock_layer->paint_bounds(), child_path.getBounds());
	EXPECT_EQ(layer->paint_bounds(), expected_layer_bounds);
	EXPECT_TRUE(mock_layer->needs_painting());
	EXPECT_TRUE(layer->needs_painting());
	EXPECT_EQ(mock_layer->parent_matrix(),
	SkMatrix::Concat(initial_transform, layer_transform));
	EXPECT_EQ(mock_layer->parent_mutators(),
	std::vector({Mutator(layer_transform), Mutator(SK_AlphaOPAQUE)}));

	const SkPaint opacity_paint = SkPaint(SkColors::kBlack); // A = 1.0f
	SkRect opacity_bounds;
	expected_layer_bounds.makeOffset(-layer_offset.fX, -layer_offset.fY)
	.roundOut(&opacity_bounds);
	auto expected_draw_calls = std::vector(
	{MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
	MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer_transform}},
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	MockCanvas::DrawCall{
	1, MockCanvas::SetMatrixData{integral_layer_transform}},
	#endif
	MockCanvas::DrawCall{
	1, MockCanvas::SaveLayerData{opacity_bounds, opacity_paint, nullptr,
	2}},
	MockCanvas::DrawCall{2,
	MockCanvas::DrawPathData{child_path, child_paint}},
	MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
	MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
	layer->Paint(paint_context());
	EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
	}

	TEST_F(OpacityLayerTest, FullyTransparent) {
	const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
	const SkPoint layer_offset = SkPoint::Make(0.5f, 1.5f);
	const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
	const SkMatrix layer_transform =
	SkMatrix::MakeTrans(layer_offset.fX, layer_offset.fY);
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	const SkMatrix integral_layer_transform = RasterCache::GetIntegralTransCTM(
	SkMatrix::Concat(initial_transform, layer_transform));
	#endif
	const SkPaint child_paint = SkPaint(SkColors::kGreen);
	const SkRect expected_layer_bounds =
	layer_transform.mapRect(child_path.getBounds());
	auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
	auto layer =
	std::make_shared<OpacityLayer>(SK_AlphaTRANSPARENT, layer_offset);
	layer->Add(mock_layer);

	layer->Preroll(preroll_context(), initial_transform);
	EXPECT_EQ(mock_layer->paint_bounds(), child_path.getBounds());
	EXPECT_EQ(layer->paint_bounds(), expected_layer_bounds);
	EXPECT_TRUE(mock_layer->needs_painting());
	EXPECT_TRUE(layer->needs_painting());
	EXPECT_EQ(mock_layer->parent_matrix(),
	SkMatrix::Concat(initial_transform, layer_transform));
	EXPECT_EQ(
	mock_layer->parent_mutators(),
	std::vector({Mutator(layer_transform), Mutator(SK_AlphaTRANSPARENT)}));

	auto expected_draw_calls = std::vector(
	{MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
	MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer_transform}},
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	MockCanvas::DrawCall{
	1, MockCanvas::SetMatrixData{integral_layer_transform}},
	#endif
	MockCanvas::DrawCall{1, MockCanvas::SaveData{2}},
	MockCanvas::DrawCall{
	2, MockCanvas::ClipRectData{kEmptyRect, SkClipOp::kIntersect,
	MockCanvas::kHard_ClipEdgeStyle}},
	MockCanvas::DrawCall{2,
	MockCanvas::DrawPathData{child_path, child_paint}},
	MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
	MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
	layer->Paint(paint_context());
	EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
	}

	TEST_F(OpacityLayerTest, HalfTransparent) {
	const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
	const SkPoint layer_offset = SkPoint::Make(0.5f, 1.5f);
	const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
	const SkMatrix layer_transform =
	SkMatrix::MakeTrans(layer_offset.fX, layer_offset.fY);
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	const SkMatrix integral_layer_transform = RasterCache::GetIntegralTransCTM(
	SkMatrix::Concat(initial_transform, layer_transform));
	#endif
	const SkPaint child_paint = SkPaint(SkColors::kGreen);
	const SkRect expected_layer_bounds =
	layer_transform.mapRect(child_path.getBounds());
	const SkAlpha alpha_half = 255 / 2;
	auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
	auto layer = std::make_shared<OpacityLayer>(alpha_half, layer_offset);
	layer->Add(mock_layer);

	layer->Preroll(preroll_context(), initial_transform);
	EXPECT_EQ(mock_layer->paint_bounds(), child_path.getBounds());
	EXPECT_EQ(layer->paint_bounds(), expected_layer_bounds);
	EXPECT_TRUE(mock_layer->needs_painting());
	EXPECT_TRUE(layer->needs_painting());
	EXPECT_EQ(mock_layer->parent_matrix(),
	SkMatrix::Concat(initial_transform, layer_transform));
	EXPECT_EQ(mock_layer->parent_mutators(),
	std::vector({Mutator(layer_transform), Mutator(alpha_half)}));

	const SkPaint opacity_paint =
	SkPaint(SkColor4f::FromColor(SkColorSetA(SK_ColorBLACK, alpha_half)));
	SkRect opacity_bounds;
	expected_layer_bounds.makeOffset(-layer_offset.fX, -layer_offset.fY)
	.roundOut(&opacity_bounds);
	auto expected_draw_calls = std::vector(
	{MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
	MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer_transform}},
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	MockCanvas::DrawCall{
	1, MockCanvas::SetMatrixData{integral_layer_transform}},
	#endif
	MockCanvas::DrawCall{
	1, MockCanvas::SaveLayerData{opacity_bounds, opacity_paint, nullptr,
	2}},
	MockCanvas::DrawCall{2,
	MockCanvas::DrawPathData{child_path, child_paint}},
	MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
	MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
	layer->Paint(paint_context());
	EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
	}

	TEST_F(OpacityLayerTest, Nested) {
	const SkPath child1_path = SkPath().addRect(SkRect::MakeWH(5.0f, 6.0f));
	const SkPath child2_path = SkPath().addRect(SkRect::MakeWH(2.0f, 7.0f));
	const SkPath child3_path = SkPath().addRect(SkRect::MakeWH(6.0f, 6.0f));
	const SkPoint layer1_offset = SkPoint::Make(0.5f, 1.5f);
	const SkPoint layer2_offset = SkPoint::Make(2.5f, 0.5f);
	const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 0.5f);
	const SkMatrix layer1_transform =
	SkMatrix::MakeTrans(layer1_offset.fX, layer1_offset.fY);
	const SkMatrix layer2_transform =
	SkMatrix::MakeTrans(layer2_offset.fX, layer2_offset.fY);
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	const SkMatrix integral_layer1_transform = RasterCache::GetIntegralTransCTM(
	SkMatrix::Concat(initial_transform, layer1_transform));
	const SkMatrix integral_layer2_transform = RasterCache::GetIntegralTransCTM(
	SkMatrix::Concat(SkMatrix::Concat(initial_transform, layer1_transform),
	layer2_transform));
	#endif
	const SkPaint child1_paint = SkPaint(SkColors::kRed);
	const SkPaint child2_paint = SkPaint(SkColors::kBlue);
	const SkPaint child3_paint = SkPaint(SkColors::kGreen);
	const SkAlpha alpha1 = 155;
	const SkAlpha alpha2 = 224;
	auto mock_layer1 = std::make_shared<MockLayer>(child1_path, child1_paint);
	auto mock_layer2 = std::make_shared<MockLayer>(child2_path, child2_paint);
	auto mock_layer3 = std::make_shared<MockLayer>(child3_path, child3_paint);
	auto layer1 = std::make_shared<OpacityLayer>(alpha1, layer1_offset);
	auto layer2 = std::make_shared<OpacityLayer>(alpha2, layer2_offset);
	layer2->Add(mock_layer2);
	layer1->Add(mock_layer1);
	layer1->Add(layer2);
	layer1->Add(mock_layer3); // Ensure something is processed after recursion

	const SkRect expected_layer2_bounds =
	layer2_transform.mapRect(child2_path.getBounds());
	SkRect expected_layer1_bounds = expected_layer2_bounds;
	expected_layer1_bounds.join(child1_path.getBounds());
	expected_layer1_bounds.join(child3_path.getBounds());
	expected_layer1_bounds = layer1_transform.mapRect(expected_layer1_bounds);
	layer1->Preroll(preroll_context(), initial_transform);
	EXPECT_EQ(mock_layer1->paint_bounds(), child1_path.getBounds());
	EXPECT_EQ(mock_layer2->paint_bounds(), child2_path.getBounds());
	EXPECT_EQ(mock_layer3->paint_bounds(), child3_path.getBounds());
	EXPECT_EQ(layer1->paint_bounds(), expected_layer1_bounds);
	EXPECT_EQ(layer2->paint_bounds(), expected_layer2_bounds);
	EXPECT_TRUE(mock_layer1->needs_painting());
	EXPECT_TRUE(mock_layer2->needs_painting());
	EXPECT_TRUE(mock_layer3->needs_painting());
	EXPECT_TRUE(layer1->needs_painting());
	EXPECT_TRUE(layer2->needs_painting());
	EXPECT_EQ(mock_layer1->parent_matrix(),
	SkMatrix::Concat(initial_transform, layer1_transform));
	// EXPECT_EQ(mock_layer1->parent_mutators(),
	// std::vector({Mutator(layer1_transform), Mutator(alpha1)}));
	EXPECT_EQ(
	mock_layer2->parent_matrix(),
	SkMatrix::Concat(SkMatrix::Concat(initial_transform, layer1_transform),
	layer2_transform));
	// EXPECT_EQ(mock_layer2->parent_mutators(),
	// std::vector({Mutator(layer1_transform), Mutator(alpha1),
	// Mutator(layer2_transform), Mutator(alpha2)}));
	EXPECT_EQ(mock_layer3->parent_matrix(),
	SkMatrix::Concat(initial_transform, layer1_transform));
	// EXPECT_EQ(mock_layer3->parent_mutators(),
	// std::vector({Mutator(layer1_transform), Mutator(alpha1)}));

	const SkPaint opacity1_paint =
	SkPaint(SkColor4f::FromColor(SkColorSetA(SK_ColorBLACK, alpha1)));
	const SkPaint opacity2_paint =
	SkPaint(SkColor4f::FromColor(SkColorSetA(SK_ColorBLACK, alpha2)));
	SkRect opacity1_bounds, opacity2_bounds;
	expected_layer1_bounds.makeOffset(-layer1_offset.fX, -layer1_offset.fY)
	.roundOut(&opacity1_bounds);
	expected_layer2_bounds.makeOffset(-layer2_offset.fX, -layer2_offset.fY)
	.roundOut(&opacity2_bounds);
	auto expected_draw_calls = std::vector(
	{MockCanvas::DrawCall{0, MockCanvas::SaveData{1}},
	MockCanvas::DrawCall{1, MockCanvas::ConcatMatrixData{layer1_transform}},
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	MockCanvas::DrawCall{
	1, MockCanvas::SetMatrixData{integral_layer1_transform}},
	#endif
	MockCanvas::DrawCall{
	1, MockCanvas::SaveLayerData{opacity1_bounds, opacity1_paint,
	nullptr, 2}},
	MockCanvas::DrawCall{
	2, MockCanvas::DrawPathData{child1_path, child1_paint}},
	MockCanvas::DrawCall{2, MockCanvas::SaveData{3}},
	MockCanvas::DrawCall{3, MockCanvas::ConcatMatrixData{layer2_transform}},
	#ifndef SUPPORT_FRACTIONAL_TRANSLATION
	MockCanvas::DrawCall{
	3, MockCanvas::SetMatrixData{integral_layer2_transform}},
	#endif
	MockCanvas::DrawCall{
	3, MockCanvas::SaveLayerData{opacity2_bounds, opacity2_paint,
	nullptr, 4}},
	MockCanvas::DrawCall{
	4, MockCanvas::DrawPathData{child2_path, child2_paint}},
	MockCanvas::DrawCall{4, MockCanvas::RestoreData{3}},
	MockCanvas::DrawCall{3, MockCanvas::RestoreData{2}},
	MockCanvas::DrawCall{
	2, MockCanvas::DrawPathData{child3_path, child3_paint}},
	MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
	MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}});
	layer1->Paint(paint_context());
	EXPECT_EQ(mock_canvas().draw_calls(), expected_draw_calls);
	}

	TEST_F(OpacityLayerTest, Readback) {
	auto initial_transform = SkMatrix();
	auto layer = std::make_shared<OpacityLayer>(kOpaque_SkAlphaType, SkPoint());
	layer->Add(std::make_shared<MockLayer>(SkPath()));

	// OpacityLayer does not read from surface
	preroll_context()->surface_needs_readback = false;
	layer->Preroll(preroll_context(), initial_transform);
	EXPECT_FALSE(preroll_context()->surface_needs_readback);

	// OpacityLayer blocks child with readback
	auto mock_layer =
	std::make_shared<MockLayer>(SkPath(), SkPaint(), false, false, true);
	layer->Add(mock_layer);
	preroll_context()->surface_needs_readback = false;
	layer->Preroll(preroll_context(), initial_transform);
	EXPECT_FALSE(preroll_context()->surface_needs_readback);
	}

	TEST_F(OpacityLayerTest, CullRectIsTransformed) {
	auto clipRectLayer = std::make_shared<ClipRectLayer>(
	SkRect::MakeLTRB(0, 0, 10, 10), flutter::hardEdge);
	auto opacityLayer =
	std::make_shared<OpacityLayer>(128, SkPoint::Make(20, 20));
	auto mockLayer = std::make_shared<MockLayer>(SkPath());
	clipRectLayer->Add(opacityLayer);
	opacityLayer->Add(mockLayer);
	clipRectLayer->Preroll(preroll_context(), SkMatrix::I());
	EXPECT_EQ(mockLayer->parent_cull_rect().fLeft, -20);
	EXPECT_EQ(mockLayer->parent_cull_rect().fTop, -20);
	}

	} // namespace testing
	} // namespace flutter