flow/layers/shader_mask_layer_unittests.cc - mirrors/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/shader_mask_layer.h"

 #include "flutter/flow/layers/layer_tree.h"
 #include "flutter/flow/layers/opacity_layer.h"
 #include "flutter/flow/raster_cache.h"
 #include "flutter/flow/raster_cache_util.h"
 #include "flutter/flow/testing/layer_test.h"
 #include "flutter/flow/testing/mock_layer.h"
 #include "flutter/fml/macros.h"
 #include "gtest/gtest.h"

 // TODO(zanderso): https://github.com/flutter/flutter/issues/127701
 // NOLINTBEGIN(bugprone-unchecked-optional-access)

 namespace flutter {
 namespace testing {

 using ShaderMaskLayerTest = LayerTest;

 static std::shared_ptr<DlColorSource> MakeFilter(DlColor color) {
   DlColor colors[] = {
       color.withAlpha(0x7f),
       color,
   };
   float stops[] = {
       0,
       1,
   };
   return DlColorSource::MakeLinear(SkPoint::Make(0, 0), SkPoint::Make(10, 10),
                                    2, colors, stops, DlTileMode::kRepeat);
 }

 #ifndef NDEBUG
 TEST_F(ShaderMaskLayerTest, PaintingEmptyLayerDies) {
   auto layer =
       std::make_shared<ShaderMaskLayer>(nullptr, kEmptyRect, DlBlendMode::kSrc);

   layer->Preroll(preroll_context());
   EXPECT_EQ(layer->paint_bounds(), kEmptyRect);
   EXPECT_EQ(layer->child_paint_bounds(), kEmptyRect);
   EXPECT_FALSE(layer->needs_painting(paint_context()));

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

 TEST_F(ShaderMaskLayerTest, PaintBeforePrerollDies) {
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
   const SkPath child_path = SkPath().addRect(child_bounds);
   auto mock_layer = std::make_shared<MockLayer>(child_path);
   auto layer =
       std::make_shared<ShaderMaskLayer>(nullptr, kEmptyRect, DlBlendMode::kSrc);
   layer->Add(mock_layer);

   EXPECT_EQ(layer->paint_bounds(), kEmptyRect);
   EXPECT_EQ(layer->child_paint_bounds(), kEmptyRect);
   EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                             "needs_painting\\(context\\)");
 }
 #endif

 TEST_F(ShaderMaskLayerTest, EmptyFilter) {
   const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
   const SkPath child_path = SkPath().addRect(child_bounds);
   const DlPaint child_paint = DlPaint(DlColor::kYellow());
   auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
   auto layer = std::make_shared<ShaderMaskLayer>(nullptr, layer_bounds,
                                                  DlBlendMode::kSrc);
   layer->Add(mock_layer);

   preroll_context()->state_stack.set_preroll_delegate(initial_transform);
   layer->Preroll(preroll_context());
   EXPECT_EQ(mock_layer->paint_bounds(), child_bounds);
   EXPECT_EQ(layer->paint_bounds(), child_bounds);
   EXPECT_EQ(layer->child_paint_bounds(), child_bounds);
   EXPECT_TRUE(mock_layer->needs_painting(paint_context()));
   EXPECT_TRUE(layer->needs_painting(paint_context()));
   EXPECT_EQ(mock_layer->parent_matrix(), initial_transform);

   DlPaint filter_paint;
   filter_paint.setBlendMode(DlBlendMode::kSrc);
   filter_paint.setColorSource(nullptr);

   layer->Paint(display_list_paint_context());
   DisplayListBuilder expected_builder;
   /* (ShaderMask)layer::Paint */ {
     expected_builder.Save();
     {
       expected_builder.SaveLayer(&child_bounds);
       {
         /* mock_layer::Paint */ {
           expected_builder.DrawPath(child_path, child_paint);
         }
         expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
         expected_builder.DrawRect(
             SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
             filter_paint);
       }
       expected_builder.Restore();
     }
     expected_builder.Restore();
   }
   EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
 }

 TEST_F(ShaderMaskLayerTest, SimpleFilter) {
   const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
   const SkPath child_path = SkPath().addRect(child_bounds);
   const DlPaint child_paint = DlPaint(DlColor::kYellow());
   auto dl_filter = MakeFilter(DlColor::kBlue());
   auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
   auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
                                                  DlBlendMode::kSrc);
   layer->Add(mock_layer);

   preroll_context()->state_stack.set_preroll_delegate(initial_transform);
   layer->Preroll(preroll_context());
   EXPECT_EQ(layer->paint_bounds(), child_bounds);
   EXPECT_EQ(layer->child_paint_bounds(), child_bounds);
   EXPECT_TRUE(layer->needs_painting(paint_context()));
   EXPECT_EQ(mock_layer->parent_matrix(), initial_transform);

   DlPaint filter_paint;
   filter_paint.setBlendMode(DlBlendMode::kSrc);
   filter_paint.setColorSource(dl_filter);

   layer->Paint(display_list_paint_context());
   DisplayListBuilder expected_builder;
   /* (ShaderMask)layer::Paint */ {
     expected_builder.Save();
     {
       expected_builder.SaveLayer(&child_bounds);
       {
         /* mock_layer::Paint */ {
           expected_builder.DrawPath(child_path, child_paint);
         }
         expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
         expected_builder.DrawRect(
             SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
             filter_paint);
       }
       expected_builder.Restore();
     }
     expected_builder.Restore();
   }
   EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
 }

 TEST_F(ShaderMaskLayerTest, MultipleChildren) {
   const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
   const SkPath child_path1 = SkPath().addRect(child_bounds);
   const SkPath child_path2 =
       SkPath().addRect(child_bounds.makeOffset(3.0f, 0.0f));
   const DlPaint child_paint1 = DlPaint(DlColor::kYellow());
   const DlPaint child_paint2 = DlPaint(DlColor::kCyan());
   auto dl_filter = MakeFilter(DlColor::kBlue());
   auto mock_layer1 = std::make_shared<MockLayer>(child_path1, child_paint1);
   auto mock_layer2 = std::make_shared<MockLayer>(child_path2, child_paint2);
   auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
                                                  DlBlendMode::kSrc);
   layer->Add(mock_layer1);
   layer->Add(mock_layer2);

   SkRect children_bounds = child_path1.getBounds();
   children_bounds.join(child_path2.getBounds());
   preroll_context()->state_stack.set_preroll_delegate(initial_transform);
   layer->Preroll(preroll_context());
   EXPECT_EQ(mock_layer1->paint_bounds(), child_path1.getBounds());
   EXPECT_EQ(mock_layer2->paint_bounds(), child_path2.getBounds());
   EXPECT_EQ(layer->paint_bounds(), children_bounds);
   EXPECT_EQ(layer->child_paint_bounds(), children_bounds);
   EXPECT_TRUE(mock_layer1->needs_painting(paint_context()));
   EXPECT_TRUE(mock_layer2->needs_painting(paint_context()));
   EXPECT_TRUE(layer->needs_painting(paint_context()));
   EXPECT_EQ(mock_layer1->parent_matrix(), initial_transform);
   EXPECT_EQ(mock_layer2->parent_matrix(), initial_transform);

   DlPaint filter_paint;
   filter_paint.setBlendMode(DlBlendMode::kSrc);
   filter_paint.setColorSource(dl_filter);

   layer->Paint(display_list_paint_context());
   DisplayListBuilder expected_builder;
   /* (ShaderMask)layer::Paint */ {
     expected_builder.Save();
     {
       expected_builder.SaveLayer(&children_bounds);
       {
         /* mock_layer1::Paint */ {
           expected_builder.DrawPath(child_path1, child_paint1);
         }
         /* mock_layer2::Paint */ {
           expected_builder.DrawPath(child_path2, child_paint2);
         }
         expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
         expected_builder.DrawRect(
             SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
             filter_paint);
       }
       expected_builder.Restore();
     }
     expected_builder.Restore();
   }
   EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
 }

 TEST_F(ShaderMaskLayerTest, Nested) {
   const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 7.5f, 8.5f);
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 20.5f, 20.5f);
   const SkPath child_path1 = SkPath().addRect(child_bounds);
   const SkPath child_path2 =
       SkPath().addRect(child_bounds.makeOffset(3.0f, 0.0f));
   const DlPaint child_paint1 = DlPaint(DlColor::kYellow());
   const DlPaint child_paint2 = DlPaint(DlColor::kCyan());
   auto dl_filter1 = MakeFilter(DlColor::kGreen());
   auto dl_filter2 = MakeFilter(DlColor::kMagenta());
   auto mock_layer1 = std::make_shared<MockLayer>(child_path1, child_paint1);
   auto mock_layer2 = std::make_shared<MockLayer>(child_path2, child_paint2);
   auto layer1 = std::make_shared<ShaderMaskLayer>(dl_filter1, layer_bounds,
                                                   DlBlendMode::kSrc);
   auto layer2 = std::make_shared<ShaderMaskLayer>(dl_filter2, layer_bounds,
                                                   DlBlendMode::kSrc);
   layer2->Add(mock_layer2);
   layer1->Add(mock_layer1);
   layer1->Add(layer2);

   SkRect children_bounds = child_path1.getBounds();
   children_bounds.join(child_path2.getBounds());
   preroll_context()->state_stack.set_preroll_delegate(initial_transform);
   layer1->Preroll(preroll_context());
   EXPECT_EQ(mock_layer1->paint_bounds(), child_path1.getBounds());
   EXPECT_EQ(mock_layer2->paint_bounds(), child_path2.getBounds());
   EXPECT_EQ(layer1->paint_bounds(), children_bounds);
   EXPECT_EQ(layer1->child_paint_bounds(), children_bounds);
   EXPECT_EQ(layer2->paint_bounds(), mock_layer2->paint_bounds());
   EXPECT_EQ(layer2->child_paint_bounds(), mock_layer2->paint_bounds());
   EXPECT_TRUE(mock_layer1->needs_painting(paint_context()));
   EXPECT_TRUE(mock_layer2->needs_painting(paint_context()));
   EXPECT_TRUE(layer1->needs_painting(paint_context()));
   EXPECT_TRUE(layer2->needs_painting(paint_context()));
   EXPECT_EQ(mock_layer1->parent_matrix(), initial_transform);
   EXPECT_EQ(mock_layer2->parent_matrix(), initial_transform);

   DlPaint filter_paint1, filter_paint2;
   filter_paint1.setBlendMode(DlBlendMode::kSrc);
   filter_paint2.setBlendMode(DlBlendMode::kSrc);
   filter_paint1.setColorSource(dl_filter1);
   filter_paint2.setColorSource(dl_filter2);

   layer1->Paint(display_list_paint_context());
   DisplayListBuilder expected_builder;
   /* (ShaderMask)layer1::Paint */ {
     expected_builder.Save();
     {
       expected_builder.SaveLayer(&children_bounds);
       {
         /* mock_layer1::Paint */ {
           expected_builder.DrawPath(child_path1, child_paint1);
         }
         /* (ShaderMask)layer2::Paint */ {
           expected_builder.Save();
           {
             expected_builder.SaveLayer(&child_path2.getBounds());
             {
               /* mock_layer2::Paint */ {
                 expected_builder.DrawPath(child_path2, child_paint2);
               }
               expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
               expected_builder.DrawRect(
                   SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
                   filter_paint2);
             }
             expected_builder.Restore();
           }
           expected_builder.Restore();
         }
         expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
         expected_builder.DrawRect(
             SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
             filter_paint1);
       }
       expected_builder.Restore();
     }
     expected_builder.Restore();
   }
   EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
 }

 TEST_F(ShaderMaskLayerTest, Readback) {
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 20.5f, 20.5f);
   auto dl_filter = MakeFilter(DlColor::kBlue());
   auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
                                                  DlBlendMode::kSrc);

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

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

 TEST_F(ShaderMaskLayerTest, LayerCached) {
   auto dl_filter = MakeFilter(DlColor::kBlue());
   DlPaint paint;
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 20.5f, 20.5f);
   auto initial_transform = SkMatrix::Translate(50.0, 25.5);
   const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
   auto mock_layer = std::make_shared<MockLayer>(child_path);
   auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
                                                  DlBlendMode::kSrc);
   layer->Add(mock_layer);

   SkMatrix cache_ctm = initial_transform;
   DisplayListBuilder cache_canvas;
   cache_canvas.Transform(cache_ctm);

   use_mock_raster_cache();
   preroll_context()->state_stack.set_preroll_delegate(initial_transform);
   const auto* cacheable_shader_masker_item = layer->raster_cache_item();

   EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
   EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
             RasterCacheItem::CacheState::kNone);
   EXPECT_FALSE(cacheable_shader_masker_item->GetId().has_value());

   // frame 1.
   layer->Preroll(preroll_context());
   LayerTree::TryToRasterCache(cacheable_items(), &paint_context());

   EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
   EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
             RasterCacheItem::CacheState::kNone);
   EXPECT_FALSE(cacheable_shader_masker_item->GetId().has_value());

   // frame 2.
   layer->Preroll(preroll_context());
   LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
   EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
   EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
             RasterCacheItem::CacheState::kNone);
   EXPECT_FALSE(cacheable_shader_masker_item->GetId().has_value());

   // frame 3.
   layer->Preroll(preroll_context());
   LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
   EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)1);
   EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
             RasterCacheItem::CacheState::kCurrent);

   EXPECT_TRUE(raster_cache()->Draw(
       cacheable_shader_masker_item->GetId().value(), cache_canvas, &paint));
 }

 TEST_F(ShaderMaskLayerTest, OpacityInheritance) {
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
   const SkPath child_path = SkPath().addRect(child_bounds);
   auto mock_layer = MockLayer::Make(child_path);
   const SkRect mask_rect = SkRect::MakeLTRB(10, 10, 20, 20);
   auto shader_mask_layer =
       std::make_shared<ShaderMaskLayer>(nullptr, mask_rect, DlBlendMode::kSrc);
   shader_mask_layer->Add(mock_layer);

   // ShaderMaskLayers can always support opacity despite incompatible children
   PrerollContext* context = preroll_context();
   shader_mask_layer->Preroll(context);
   EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);

   int opacity_alpha = 0x7F;
   SkPoint offset = SkPoint::Make(10, 10);
   auto opacity_layer = std::make_shared<OpacityLayer>(opacity_alpha, offset);
   opacity_layer->Add(shader_mask_layer);
   opacity_layer->Preroll(context);
   EXPECT_TRUE(opacity_layer->children_can_accept_opacity());

   DisplayListBuilder expected_builder;
   /* OpacityLayer::Paint() */ {
     expected_builder.Save();
     {
       expected_builder.Translate(offset.fX, offset.fY);
       /* ShaderMaskLayer::Paint() */ {
         DlPaint sl_paint = DlPaint(opacity_alpha << 24);
         expected_builder.SaveLayer(&child_path.getBounds(), &sl_paint);
         {
           /* child layer paint */ {
             expected_builder.DrawPath(child_path, DlPaint());
           }
           expected_builder.Translate(mask_rect.fLeft, mask_rect.fTop);
           expected_builder.DrawRect(
               SkRect::MakeWH(mask_rect.width(), mask_rect.height()),
               DlPaint().setBlendMode(DlBlendMode::kSrc));
         }
         expected_builder.Restore();
       }
     }
     expected_builder.Restore();
   }

   opacity_layer->Paint(display_list_paint_context());
   EXPECT_TRUE(DisplayListsEQ_Verbose(expected_builder.Build(), display_list()));
 }

 TEST_F(ShaderMaskLayerTest, SimpleFilterWithRasterCacheLayerNotCached) {
   use_mock_raster_cache();  // Ensure non-fractional alignment.

   const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
   const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
   const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
   const SkPath child_path = SkPath().addRect(child_bounds);
   const DlPaint child_paint = DlPaint(DlColor::kYellow());
   auto dl_filter = MakeFilter(DlColor::kBlue());
   auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
   auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
                                                  DlBlendMode::kSrc);
   layer->Add(mock_layer);

   preroll_context()->state_stack.set_preroll_delegate(initial_transform);
   layer->Preroll(preroll_context());

   DlPaint filter_paint;
   filter_paint.setBlendMode(DlBlendMode::kSrc);
   filter_paint.setColorSource(dl_filter);

   layer->Paint(display_list_paint_context());
   DisplayListBuilder expected_builder;
   /* (ShaderMask)layer::Paint */ {
     expected_builder.Save();
     {
       expected_builder.TransformReset();
       // The layer will perform this Identity transform operation by default,
       // but it should be ignored both here and in the layer paint
       expected_builder.Transform(SkMatrix());
       expected_builder.SaveLayer(&child_bounds);
       {
         /* mock_layer::Paint */ {
           expected_builder.DrawPath(child_path, child_paint);
         }
         expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
         expected_builder.DrawRect(
             SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
             filter_paint);
       }
       expected_builder.Restore();
     }
     expected_builder.Restore();
   }
   EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
 }

 }  // namespace testing
 }  // namespace flutter

 // NOLINTEND(bugprone-unchecked-optional-access)
	// 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/shader_mask_layer.h"

	#include "flutter/flow/layers/layer_tree.h"
	#include "flutter/flow/layers/opacity_layer.h"
	#include "flutter/flow/raster_cache.h"
	#include "flutter/flow/raster_cache_util.h"
	#include "flutter/flow/testing/layer_test.h"
	#include "flutter/flow/testing/mock_layer.h"
	#include "flutter/fml/macros.h"
	#include "gtest/gtest.h"

	// TODO(zanderso): https://github.com/flutter/flutter/issues/127701
	// NOLINTBEGIN(bugprone-unchecked-optional-access)

	namespace flutter {
	namespace testing {

	using ShaderMaskLayerTest = LayerTest;

	static std::shared_ptr<DlColorSource> MakeFilter(DlColor color) {
	DlColor colors[] = {
	color.withAlpha(0x7f),
	color,
	};
	float stops[] = {
	0,
	1,
	};
	return DlColorSource::MakeLinear(SkPoint::Make(0, 0), SkPoint::Make(10, 10),
	2, colors, stops, DlTileMode::kRepeat);
	}

	#ifndef NDEBUG
	TEST_F(ShaderMaskLayerTest, PaintingEmptyLayerDies) {
	auto layer =
	std::make_shared<ShaderMaskLayer>(nullptr, kEmptyRect, DlBlendMode::kSrc);

	layer->Preroll(preroll_context());
	EXPECT_EQ(layer->paint_bounds(), kEmptyRect);
	EXPECT_EQ(layer->child_paint_bounds(), kEmptyRect);
	EXPECT_FALSE(layer->needs_painting(paint_context()));

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

	TEST_F(ShaderMaskLayerTest, PaintBeforePrerollDies) {
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
	const SkPath child_path = SkPath().addRect(child_bounds);
	auto mock_layer = std::make_shared<MockLayer>(child_path);
	auto layer =
	std::make_shared<ShaderMaskLayer>(nullptr, kEmptyRect, DlBlendMode::kSrc);
	layer->Add(mock_layer);

	EXPECT_EQ(layer->paint_bounds(), kEmptyRect);
	EXPECT_EQ(layer->child_paint_bounds(), kEmptyRect);
	EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
	"needs_painting\\(context\\)");
	}
	#endif

	TEST_F(ShaderMaskLayerTest, EmptyFilter) {
	const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
	const SkPath child_path = SkPath().addRect(child_bounds);
	const DlPaint child_paint = DlPaint(DlColor::kYellow());
	auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
	auto layer = std::make_shared<ShaderMaskLayer>(nullptr, layer_bounds,
	DlBlendMode::kSrc);
	layer->Add(mock_layer);

	preroll_context()->state_stack.set_preroll_delegate(initial_transform);
	layer->Preroll(preroll_context());
	EXPECT_EQ(mock_layer->paint_bounds(), child_bounds);
	EXPECT_EQ(layer->paint_bounds(), child_bounds);
	EXPECT_EQ(layer->child_paint_bounds(), child_bounds);
	EXPECT_TRUE(mock_layer->needs_painting(paint_context()));
	EXPECT_TRUE(layer->needs_painting(paint_context()));
	EXPECT_EQ(mock_layer->parent_matrix(), initial_transform);

	DlPaint filter_paint;
	filter_paint.setBlendMode(DlBlendMode::kSrc);
	filter_paint.setColorSource(nullptr);

	layer->Paint(display_list_paint_context());
	DisplayListBuilder expected_builder;
	/* (ShaderMask)layer::Paint */ {
	expected_builder.Save();
	{
	expected_builder.SaveLayer(&child_bounds);
	{
	/* mock_layer::Paint */ {
	expected_builder.DrawPath(child_path, child_paint);
	}
	expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
	filter_paint);
	}
	expected_builder.Restore();
	}
	expected_builder.Restore();
	}
	EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
	}

	TEST_F(ShaderMaskLayerTest, SimpleFilter) {
	const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
	const SkPath child_path = SkPath().addRect(child_bounds);
	const DlPaint child_paint = DlPaint(DlColor::kYellow());
	auto dl_filter = MakeFilter(DlColor::kBlue());
	auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
	auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
	DlBlendMode::kSrc);
	layer->Add(mock_layer);

	preroll_context()->state_stack.set_preroll_delegate(initial_transform);
	layer->Preroll(preroll_context());
	EXPECT_EQ(layer->paint_bounds(), child_bounds);
	EXPECT_EQ(layer->child_paint_bounds(), child_bounds);
	EXPECT_TRUE(layer->needs_painting(paint_context()));
	EXPECT_EQ(mock_layer->parent_matrix(), initial_transform);

	DlPaint filter_paint;
	filter_paint.setBlendMode(DlBlendMode::kSrc);
	filter_paint.setColorSource(dl_filter);

	layer->Paint(display_list_paint_context());
	DisplayListBuilder expected_builder;
	/* (ShaderMask)layer::Paint */ {
	expected_builder.Save();
	{
	expected_builder.SaveLayer(&child_bounds);
	{
	/* mock_layer::Paint */ {
	expected_builder.DrawPath(child_path, child_paint);
	}
	expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
	filter_paint);
	}
	expected_builder.Restore();
	}
	expected_builder.Restore();
	}
	EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
	}

	TEST_F(ShaderMaskLayerTest, MultipleChildren) {
	const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
	const SkPath child_path1 = SkPath().addRect(child_bounds);
	const SkPath child_path2 =
	SkPath().addRect(child_bounds.makeOffset(3.0f, 0.0f));
	const DlPaint child_paint1 = DlPaint(DlColor::kYellow());
	const DlPaint child_paint2 = DlPaint(DlColor::kCyan());
	auto dl_filter = MakeFilter(DlColor::kBlue());
	auto mock_layer1 = std::make_shared<MockLayer>(child_path1, child_paint1);
	auto mock_layer2 = std::make_shared<MockLayer>(child_path2, child_paint2);
	auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
	DlBlendMode::kSrc);
	layer->Add(mock_layer1);
	layer->Add(mock_layer2);

	SkRect children_bounds = child_path1.getBounds();
	children_bounds.join(child_path2.getBounds());
	preroll_context()->state_stack.set_preroll_delegate(initial_transform);
	layer->Preroll(preroll_context());
	EXPECT_EQ(mock_layer1->paint_bounds(), child_path1.getBounds());
	EXPECT_EQ(mock_layer2->paint_bounds(), child_path2.getBounds());
	EXPECT_EQ(layer->paint_bounds(), children_bounds);
	EXPECT_EQ(layer->child_paint_bounds(), children_bounds);
	EXPECT_TRUE(mock_layer1->needs_painting(paint_context()));
	EXPECT_TRUE(mock_layer2->needs_painting(paint_context()));
	EXPECT_TRUE(layer->needs_painting(paint_context()));
	EXPECT_EQ(mock_layer1->parent_matrix(), initial_transform);
	EXPECT_EQ(mock_layer2->parent_matrix(), initial_transform);

	DlPaint filter_paint;
	filter_paint.setBlendMode(DlBlendMode::kSrc);
	filter_paint.setColorSource(dl_filter);

	layer->Paint(display_list_paint_context());
	DisplayListBuilder expected_builder;
	/* (ShaderMask)layer::Paint */ {
	expected_builder.Save();
	{
	expected_builder.SaveLayer(&children_bounds);
	{
	/* mock_layer1::Paint */ {
	expected_builder.DrawPath(child_path1, child_paint1);
	}
	/* mock_layer2::Paint */ {
	expected_builder.DrawPath(child_path2, child_paint2);
	}
	expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
	filter_paint);
	}
	expected_builder.Restore();
	}
	expected_builder.Restore();
	}
	EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
	}

	TEST_F(ShaderMaskLayerTest, Nested) {
	const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 7.5f, 8.5f);
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 20.5f, 20.5f);
	const SkPath child_path1 = SkPath().addRect(child_bounds);
	const SkPath child_path2 =
	SkPath().addRect(child_bounds.makeOffset(3.0f, 0.0f));
	const DlPaint child_paint1 = DlPaint(DlColor::kYellow());
	const DlPaint child_paint2 = DlPaint(DlColor::kCyan());
	auto dl_filter1 = MakeFilter(DlColor::kGreen());
	auto dl_filter2 = MakeFilter(DlColor::kMagenta());
	auto mock_layer1 = std::make_shared<MockLayer>(child_path1, child_paint1);
	auto mock_layer2 = std::make_shared<MockLayer>(child_path2, child_paint2);
	auto layer1 = std::make_shared<ShaderMaskLayer>(dl_filter1, layer_bounds,
	DlBlendMode::kSrc);
	auto layer2 = std::make_shared<ShaderMaskLayer>(dl_filter2, layer_bounds,
	DlBlendMode::kSrc);
	layer2->Add(mock_layer2);
	layer1->Add(mock_layer1);
	layer1->Add(layer2);

	SkRect children_bounds = child_path1.getBounds();
	children_bounds.join(child_path2.getBounds());
	preroll_context()->state_stack.set_preroll_delegate(initial_transform);
	layer1->Preroll(preroll_context());
	EXPECT_EQ(mock_layer1->paint_bounds(), child_path1.getBounds());
	EXPECT_EQ(mock_layer2->paint_bounds(), child_path2.getBounds());
	EXPECT_EQ(layer1->paint_bounds(), children_bounds);
	EXPECT_EQ(layer1->child_paint_bounds(), children_bounds);
	EXPECT_EQ(layer2->paint_bounds(), mock_layer2->paint_bounds());
	EXPECT_EQ(layer2->child_paint_bounds(), mock_layer2->paint_bounds());
	EXPECT_TRUE(mock_layer1->needs_painting(paint_context()));
	EXPECT_TRUE(mock_layer2->needs_painting(paint_context()));
	EXPECT_TRUE(layer1->needs_painting(paint_context()));
	EXPECT_TRUE(layer2->needs_painting(paint_context()));
	EXPECT_EQ(mock_layer1->parent_matrix(), initial_transform);
	EXPECT_EQ(mock_layer2->parent_matrix(), initial_transform);

	DlPaint filter_paint1, filter_paint2;
	filter_paint1.setBlendMode(DlBlendMode::kSrc);
	filter_paint2.setBlendMode(DlBlendMode::kSrc);
	filter_paint1.setColorSource(dl_filter1);
	filter_paint2.setColorSource(dl_filter2);

	layer1->Paint(display_list_paint_context());
	DisplayListBuilder expected_builder;
	/* (ShaderMask)layer1::Paint */ {
	expected_builder.Save();
	{
	expected_builder.SaveLayer(&children_bounds);
	{
	/* mock_layer1::Paint */ {
	expected_builder.DrawPath(child_path1, child_paint1);
	}
	/* (ShaderMask)layer2::Paint */ {
	expected_builder.Save();
	{
	expected_builder.SaveLayer(&child_path2.getBounds());
	{
	/* mock_layer2::Paint */ {
	expected_builder.DrawPath(child_path2, child_paint2);
	}
	expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
	filter_paint2);
	}
	expected_builder.Restore();
	}
	expected_builder.Restore();
	}
	expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
	filter_paint1);
	}
	expected_builder.Restore();
	}
	expected_builder.Restore();
	}
	EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
	}

	TEST_F(ShaderMaskLayerTest, Readback) {
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 20.5f, 20.5f);
	auto dl_filter = MakeFilter(DlColor::kBlue());
	auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
	DlBlendMode::kSrc);

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

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

	TEST_F(ShaderMaskLayerTest, LayerCached) {
	auto dl_filter = MakeFilter(DlColor::kBlue());
	DlPaint paint;
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 20.5f, 20.5f);
	auto initial_transform = SkMatrix::Translate(50.0, 25.5);
	const SkPath child_path = SkPath().addRect(SkRect::MakeWH(5.0f, 5.0f));
	auto mock_layer = std::make_shared<MockLayer>(child_path);
	auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
	DlBlendMode::kSrc);
	layer->Add(mock_layer);

	SkMatrix cache_ctm = initial_transform;
	DisplayListBuilder cache_canvas;
	cache_canvas.Transform(cache_ctm);

	use_mock_raster_cache();
	preroll_context()->state_stack.set_preroll_delegate(initial_transform);
	const auto* cacheable_shader_masker_item = layer->raster_cache_item();

	EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
	EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
	RasterCacheItem::CacheState::kNone);
	EXPECT_FALSE(cacheable_shader_masker_item->GetId().has_value());

	// frame 1.
	layer->Preroll(preroll_context());
	LayerTree::TryToRasterCache(cacheable_items(), &paint_context());

	EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
	EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
	RasterCacheItem::CacheState::kNone);
	EXPECT_FALSE(cacheable_shader_masker_item->GetId().has_value());

	// frame 2.
	layer->Preroll(preroll_context());
	LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
	EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
	EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
	RasterCacheItem::CacheState::kNone);
	EXPECT_FALSE(cacheable_shader_masker_item->GetId().has_value());

	// frame 3.
	layer->Preroll(preroll_context());
	LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
	EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)1);
	EXPECT_EQ(cacheable_shader_masker_item->cache_state(),
	RasterCacheItem::CacheState::kCurrent);

	EXPECT_TRUE(raster_cache()->Draw(
	cacheable_shader_masker_item->GetId().value(), cache_canvas, &paint));
	}

	TEST_F(ShaderMaskLayerTest, OpacityInheritance) {
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
	const SkPath child_path = SkPath().addRect(child_bounds);
	auto mock_layer = MockLayer::Make(child_path);
	const SkRect mask_rect = SkRect::MakeLTRB(10, 10, 20, 20);
	auto shader_mask_layer =
	std::make_shared<ShaderMaskLayer>(nullptr, mask_rect, DlBlendMode::kSrc);
	shader_mask_layer->Add(mock_layer);

	// ShaderMaskLayers can always support opacity despite incompatible children
	PrerollContext* context = preroll_context();
	shader_mask_layer->Preroll(context);
	EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);

	int opacity_alpha = 0x7F;
	SkPoint offset = SkPoint::Make(10, 10);
	auto opacity_layer = std::make_shared<OpacityLayer>(opacity_alpha, offset);
	opacity_layer->Add(shader_mask_layer);
	opacity_layer->Preroll(context);
	EXPECT_TRUE(opacity_layer->children_can_accept_opacity());

	DisplayListBuilder expected_builder;
	/* OpacityLayer::Paint() */ {
	expected_builder.Save();
	{
	expected_builder.Translate(offset.fX, offset.fY);
	/* ShaderMaskLayer::Paint() */ {
	DlPaint sl_paint = DlPaint(opacity_alpha << 24);
	expected_builder.SaveLayer(&child_path.getBounds(), &sl_paint);
	{
	/* child layer paint */ {
	expected_builder.DrawPath(child_path, DlPaint());
	}
	expected_builder.Translate(mask_rect.fLeft, mask_rect.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(mask_rect.width(), mask_rect.height()),
	DlPaint().setBlendMode(DlBlendMode::kSrc));
	}
	expected_builder.Restore();
	}
	}
	expected_builder.Restore();
	}

	opacity_layer->Paint(display_list_paint_context());
	EXPECT_TRUE(DisplayListsEQ_Verbose(expected_builder.Build(), display_list()));
	}

	TEST_F(ShaderMaskLayerTest, SimpleFilterWithRasterCacheLayerNotCached) {
	use_mock_raster_cache(); // Ensure non-fractional alignment.

	const SkMatrix initial_transform = SkMatrix::Translate(0.5f, 1.0f);
	const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
	const SkRect layer_bounds = SkRect::MakeLTRB(2.0f, 4.0f, 6.5f, 6.5f);
	const SkPath child_path = SkPath().addRect(child_bounds);
	const DlPaint child_paint = DlPaint(DlColor::kYellow());
	auto dl_filter = MakeFilter(DlColor::kBlue());
	auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
	auto layer = std::make_shared<ShaderMaskLayer>(dl_filter, layer_bounds,
	DlBlendMode::kSrc);
	layer->Add(mock_layer);

	preroll_context()->state_stack.set_preroll_delegate(initial_transform);
	layer->Preroll(preroll_context());

	DlPaint filter_paint;
	filter_paint.setBlendMode(DlBlendMode::kSrc);
	filter_paint.setColorSource(dl_filter);

	layer->Paint(display_list_paint_context());
	DisplayListBuilder expected_builder;
	/* (ShaderMask)layer::Paint */ {
	expected_builder.Save();
	{
	expected_builder.TransformReset();
	// The layer will perform this Identity transform operation by default,
	// but it should be ignored both here and in the layer paint
	expected_builder.Transform(SkMatrix());
	expected_builder.SaveLayer(&child_bounds);
	{
	/* mock_layer::Paint */ {
	expected_builder.DrawPath(child_path, child_paint);
	}
	expected_builder.Translate(layer_bounds.fLeft, layer_bounds.fTop);
	expected_builder.DrawRect(
	SkRect::MakeWH(layer_bounds.width(), layer_bounds.height()),
	filter_paint);
	}
	expected_builder.Restore();
	}
	expected_builder.Restore();
	}
	EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
	}

	} // namespace testing
	} // namespace flutter

	// NOLINTEND(bugprone-unchecked-optional-access)