clip_rect_layer_unittests.cc

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// 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/clip_rect_layer.h"
 
#include "flutter/flow/layers/layer_tree.h"
#include "flutter/flow/layers/opacity_layer.h"
#include "flutter/flow/layers/platform_view_layer.h"
#include "flutter/flow/testing/layer_test.h"
#include "flutter/flow/testing/mock_embedder.h"
#include "flutter/flow/testing/mock_layer.h"
#include "flutter/fml/macros.h"
 
// TODO(zanderso): https://github.com/flutter/flutter/issues/127701
// NOLINTBEGIN(bugprone-unchecked-optional-access)
 
namespace flutter {
namespace testing {
 
using ClipRectLayerTest = LayerTest;
 
#ifndef NDEBUG
TEST_F(ClipRectLayerTest, ClipNoneBehaviorDies) {
  EXPECT_DEATH_IF_SUPPORTED(
      auto clip = std::make_shared<ClipRectLayer>(DlRect(), Clip::kNone),
      "clip_behavior != Clip::kNone");
}
 
TEST_F(ClipRectLayerTest, PaintingEmptyLayerDies) {
  auto layer = std::make_shared<ClipRectLayer>(DlRect(), Clip::kHardEdge);
 
  layer->Preroll(preroll_context());
 
  // Untouched
  EXPECT_EQ(preroll_context()->state_stack.device_cull_rect(), kGiantRect);
  EXPECT_TRUE(preroll_context()->state_stack.is_empty());
 
  EXPECT_EQ(layer->paint_bounds(), DlRect());
  EXPECT_EQ(layer->child_paint_bounds(), DlRect());
  EXPECT_FALSE(layer->needs_painting(paint_context()));
 
  EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                            "needs_painting\\(context\\)");
}
 
TEST_F(ClipRectLayerTest, PaintBeforePrerollDies) {
  const DlRect layer_bounds = DlRect::MakeXYWH(0.5, 1.0, 5.0, 6.0);
  auto layer = std::make_shared<ClipRectLayer>(layer_bounds, Clip::kHardEdge);
  EXPECT_EQ(layer->paint_bounds(), DlRect());
  EXPECT_EQ(layer->child_paint_bounds(), DlRect());
  EXPECT_FALSE(layer->needs_painting(paint_context()));
 
  EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                            "needs_painting\\(context\\)");
}
 
TEST_F(ClipRectLayerTest, PaintingCulledLayerDies) {
  const DlMatrix initial_matrix = DlMatrix::MakeTranslation({0.5f, 1.0f});
  const DlRect child_bounds = DlRect::MakeXYWH(1.0, 2.0, 2.0, 2.0);
  const DlRect layer_bounds = DlRect::MakeXYWH(0.5, 1.0, 5.0, 6.0);
  const DlRect distant_bounds = DlRect::MakeXYWH(100.0, 100.0, 10.0, 10.0);
  const DlPath child_path = DlPath::MakeRect(child_bounds);
  auto mock_layer = std::make_shared<MockLayer>(child_path);
  auto layer = std::make_shared<ClipRectLayer>(layer_bounds, Clip::kHardEdge);
  layer->Add(mock_layer);
 
  // Cull these children
  preroll_context()->state_stack.set_preroll_delegate(distant_bounds,
                                                      initial_matrix);
  layer->Preroll(preroll_context());
 
  // Untouched
  EXPECT_EQ(preroll_context()->state_stack.device_cull_rect(), distant_bounds);
  EXPECT_TRUE(preroll_context()->state_stack.is_empty());
 
  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_cull_rect(), DlRect());
  EXPECT_EQ(mock_layer->parent_matrix(), initial_matrix);
  EXPECT_EQ(mock_layer->parent_mutators(),
            std::vector({Mutator(layer_bounds)}));
 
  auto mutator = paint_context().state_stack.save();
  mutator.clipRect(distant_bounds, false);
  EXPECT_FALSE(mock_layer->needs_painting(paint_context()));
  EXPECT_FALSE(layer->needs_painting(paint_context()));
  EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
                            "needs_painting\\(context\\)");
}
#endif
 
TEST_F(ClipRectLayerTest, ChildOutsideBounds) {
  const DlMatrix initial_matrix = DlMatrix::MakeTranslation({0.5f, 1.0f});
  const DlRect local_cull_bounds = DlRect::MakeXYWH(0.0, 0.0, 2.0, 4.0);
  const DlRect device_cull_bounds =
      local_cull_bounds.TransformAndClipBounds(initial_matrix);
  const DlRect child_bounds = DlRect::MakeXYWH(2.5, 5.0, 4.5, 4.0);
  const DlRect clip_rect = DlRect::MakeXYWH(0.5, 1.0, 5.0, 6.0);
  const DlPath child_path = DlPath::MakeRect(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<ClipRectLayer>(clip_rect, Clip::kHardEdge);
  layer->Add(mock_layer);
 
  auto clip_cull_rect = local_cull_bounds.Intersection(clip_rect);
  ASSERT_TRUE(clip_cull_rect.has_value());
  auto clip_layer_bounds = child_bounds.Intersection(clip_rect);
  ASSERT_TRUE(clip_layer_bounds.has_value());
 
  // Set up both contexts to cull clipped child
  preroll_context()->state_stack.set_preroll_delegate(device_cull_bounds,
                                                      initial_matrix);
  paint_context().canvas->ClipRect(device_cull_bounds);
  paint_context().canvas->Transform(initial_matrix);
 
  layer->Preroll(preroll_context());
  // Untouched
  EXPECT_EQ(preroll_context()->state_stack.device_cull_rect(),
            device_cull_bounds);
  EXPECT_EQ(preroll_context()->state_stack.local_cull_rect(),
            local_cull_bounds);
  EXPECT_TRUE(preroll_context()->state_stack.is_empty());
 
  EXPECT_EQ(mock_layer->paint_bounds(), child_bounds);
  EXPECT_EQ(layer->paint_bounds(), clip_layer_bounds.value());
  EXPECT_EQ(layer->child_paint_bounds(), child_bounds);
  EXPECT_EQ(mock_layer->parent_cull_rect(), clip_cull_rect.value());
  EXPECT_EQ(mock_layer->parent_matrix(), initial_matrix);
  EXPECT_EQ(mock_layer->parent_mutators(), std::vector({Mutator(clip_rect)}));
 
  EXPECT_FALSE(layer->needs_painting(paint_context()));
  EXPECT_FALSE(mock_layer->needs_painting(paint_context()));
  // Top level layer not visible so calling layer->Paint()
  // would trip an FML_DCHECK
}
 
TEST_F(ClipRectLayerTest, FullyContainedChild) {
  const DlMatrix initial_matrix = DlMatrix::MakeTranslation({0.5f, 1.0f});
  const DlRect child_bounds = DlRect::MakeXYWH(1.0, 2.0, 2.0, 2.0);
  const DlRect layer_bounds = DlRect::MakeXYWH(0.5, 1.0, 5.0, 6.0);
  const DlPath child_path = DlPath::MakeRect(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<ClipRectLayer>(layer_bounds, Clip::kHardEdge);
  layer->Add(mock_layer);
 
  preroll_context()->state_stack.set_preroll_delegate(initial_matrix);
  layer->Preroll(preroll_context());
 
  // Untouched
  EXPECT_EQ(preroll_context()->state_stack.device_cull_rect(), kGiantRect);
  EXPECT_TRUE(preroll_context()->state_stack.is_empty());
 
  EXPECT_EQ(mock_layer->paint_bounds(), child_bounds);
  EXPECT_EQ(layer->paint_bounds(), mock_layer->paint_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_cull_rect(), layer_bounds);
  EXPECT_EQ(mock_layer->parent_matrix(), initial_matrix);
  EXPECT_EQ(mock_layer->parent_mutators(),
            std::vector({Mutator(layer_bounds)}));
 
  layer->Paint(display_list_paint_context());
  DisplayListBuilder expected_builder;
  /* (ClipRect)layer::Paint */ {
    expected_builder.Save();
    {
      expected_builder.ClipRect(layer_bounds);
      /* mock_layer::Paint */ {
        expected_builder.DrawPath(child_path, child_paint);
      }
    }
    expected_builder.Restore();
  }
  EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
}
 
TEST_F(ClipRectLayerTest, PartiallyContainedChild) {
  const DlMatrix initial_matrix = DlMatrix::MakeTranslation({0.5f, 1.0f});
  const DlRect local_cull_bounds = DlRect::MakeXYWH(0.0, 0.0, 4.0, 5.5);
  const DlRect device_cull_bounds =
      local_cull_bounds.TransformAndClipBounds(initial_matrix);
  const DlRect child_bounds = DlRect::MakeXYWH(2.5, 5.0, 4.5, 4.0);
  const DlRect clip_rect = DlRect::MakeXYWH(0.5, 1.0, 5.0, 6.0);
  const DlPath child_path = DlPath::MakeRect(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<ClipRectLayer>(clip_rect, Clip::kHardEdge);
  layer->Add(mock_layer);
 
  auto clip_cull_rect = clip_rect.Intersection(local_cull_bounds);
  ASSERT_TRUE(clip_cull_rect.has_value());
  auto clip_layer_bounds = clip_rect.Intersection(child_bounds);
  ASSERT_TRUE(clip_layer_bounds.has_value());
 
  // Cull child
  preroll_context()->state_stack.set_preroll_delegate(device_cull_bounds,
                                                      initial_matrix);
  layer->Preroll(preroll_context());
 
  // Untouched
  EXPECT_EQ(preroll_context()->state_stack.device_cull_rect(),
            device_cull_bounds);
  EXPECT_TRUE(preroll_context()->state_stack.is_empty());
 
  EXPECT_EQ(mock_layer->paint_bounds(), child_bounds);
  EXPECT_EQ(layer->paint_bounds(), clip_layer_bounds.value());
  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_cull_rect(), clip_cull_rect.value());
  EXPECT_EQ(mock_layer->parent_matrix(), initial_matrix);
  EXPECT_EQ(mock_layer->parent_mutators(), std::vector({Mutator(clip_rect)}));
 
  layer->Paint(display_list_paint_context());
  DisplayListBuilder expected_builder;
  /* (ClipRect)layer::Paint */ {
    expected_builder.Save();
    {
      expected_builder.ClipRect(clip_rect);
      /* mock_layer::Paint */ {
        expected_builder.DrawPath(child_path, child_paint);
      }
    }
    expected_builder.Restore();
  }
  EXPECT_TRUE(DisplayListsEQ_Verbose(display_list(), expected_builder.Build()));
}
 
static bool ReadbackResult(PrerollContext* context,
                           Clip clip_behavior,
                           const std::shared_ptr<Layer>& child,
                           bool before) {
  const DlRect layer_bounds = DlRect::MakeXYWH(0.5, 1.0, 5.0, 6.0);
  auto layer = std::make_shared<ClipRectLayer>(layer_bounds, clip_behavior);
  if (child != nullptr) {
    layer->Add(child);
  }
  context->surface_needs_readback = before;
  layer->Preroll(context);
  return context->surface_needs_readback;
}
 
TEST_F(ClipRectLayerTest, Readback) {
  PrerollContext* context = preroll_context();
  DlPath path;
  DlPaint paint;
 
  const Clip hard = Clip::kHardEdge;
  const Clip soft = Clip::kAntiAlias;
  const Clip save_layer = Clip::kAntiAliasWithSaveLayer;
 
  std::shared_ptr<MockLayer> nochild;
  auto reader = std::make_shared<MockLayer>(path, paint);
  reader->set_fake_reads_surface(true);
  auto nonreader = std::make_shared<MockLayer>(path, paint);
 
  // No children, no prior readback -> no readback after
  EXPECT_FALSE(ReadbackResult(context, hard, nochild, false));
  EXPECT_FALSE(ReadbackResult(context, soft, nochild, false));
  EXPECT_FALSE(ReadbackResult(context, save_layer, nochild, false));
 
  // No children, prior readback -> readback after
  EXPECT_TRUE(ReadbackResult(context, hard, nochild, true));
  EXPECT_TRUE(ReadbackResult(context, soft, nochild, true));
  EXPECT_TRUE(ReadbackResult(context, save_layer, nochild, true));
 
  // Non readback child, no prior readback -> no readback after
  EXPECT_FALSE(ReadbackResult(context, hard, nonreader, false));
  EXPECT_FALSE(ReadbackResult(context, soft, nonreader, false));
  EXPECT_FALSE(ReadbackResult(context, save_layer, nonreader, false));
 
  // Non readback child, prior readback -> readback after
  EXPECT_TRUE(ReadbackResult(context, hard, nonreader, true));
  EXPECT_TRUE(ReadbackResult(context, soft, nonreader, true));
  EXPECT_TRUE(ReadbackResult(context, save_layer, nonreader, true));
 
  // Readback child, no prior readback -> readback after unless SaveLayer
  EXPECT_TRUE(ReadbackResult(context, hard, reader, false));
  EXPECT_TRUE(ReadbackResult(context, soft, reader, false));
  EXPECT_FALSE(ReadbackResult(context, save_layer, reader, false));
 
  // Readback child, prior readback -> readback after
  EXPECT_TRUE(ReadbackResult(context, hard, reader, true));
  EXPECT_TRUE(ReadbackResult(context, soft, reader, true));
  EXPECT_TRUE(ReadbackResult(context, save_layer, reader, true));
}
 
TEST_F(ClipRectLayerTest, OpacityInheritance) {
  auto path1 = DlPath::MakeRectLTRB(10, 10, 30, 30);
  auto mock1 = MockLayer::MakeOpacityCompatible(path1);
  DlRect clip_rect = DlRect::MakeWH(500, 500);
  auto clip_rect_layer =
      std::make_shared<ClipRectLayer>(clip_rect, Clip::kHardEdge);
  clip_rect_layer->Add(mock1);
 
  // ClipRectLayer will pass through compatibility from a compatible child
  PrerollContext* context = preroll_context();
  clip_rect_layer->Preroll(context);
  EXPECT_EQ(context->renderable_state_flags,
            LayerStateStack::kCallerCanApplyOpacity);
 
  auto path2 = DlPath::MakeRectLTRB(40, 40, 50, 50);
  auto mock2 = MockLayer::MakeOpacityCompatible(path2);
  clip_rect_layer->Add(mock2);
 
  // ClipRectLayer will pass through compatibility from multiple
  // non-overlapping compatible children
  clip_rect_layer->Preroll(context);
  EXPECT_EQ(context->renderable_state_flags,
            LayerStateStack::kCallerCanApplyOpacity);
 
  auto path3 = DlPath::MakeRectLTRB(20, 20, 40, 40);
  auto mock3 = MockLayer::MakeOpacityCompatible(path3);
  clip_rect_layer->Add(mock3);
 
  // ClipRectLayer will not pass through compatibility from multiple
  // overlapping children even if they are individually compatible
  clip_rect_layer->Preroll(context);
  EXPECT_EQ(context->renderable_state_flags, 0);
 
  {
    // ClipRectLayer(aa with saveLayer) will always be compatible
    auto clip_path_savelayer = std::make_shared<ClipRectLayer>(
        clip_rect, Clip::kAntiAliasWithSaveLayer);
    clip_path_savelayer->Add(mock1);
    clip_path_savelayer->Add(mock2);
 
    // Double check first two children are compatible and non-overlapping
    clip_path_savelayer->Preroll(context);
    EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);
 
    // Now add the overlapping child and test again, should still be compatible
    clip_path_savelayer->Add(mock3);
    clip_path_savelayer->Preroll(context);
    EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);
  }
 
  // An incompatible, but non-overlapping child for the following tests
  auto path4 = DlPath::MakeRectLTRB(60, 60, 70, 70);
  auto mock4 = MockLayer::Make(path4);
 
  {
    // ClipRectLayer with incompatible child will not be compatible
    auto clip_rect_bad_child =
        std::make_shared<ClipRectLayer>(clip_rect, Clip::kHardEdge);
    clip_rect_bad_child->Add(mock1);
    clip_rect_bad_child->Add(mock2);
 
    // Double check first two children are compatible and non-overlapping
    clip_rect_bad_child->Preroll(context);
    EXPECT_EQ(context->renderable_state_flags,
              LayerStateStack::kCallerCanApplyOpacity);
 
    clip_rect_bad_child->Add(mock4);
 
    // The third child is non-overlapping, but not compatible so the
    // TransformLayer should end up incompatible
    clip_rect_bad_child->Preroll(context);
    EXPECT_EQ(context->renderable_state_flags, 0);
  }
 
  {
    // ClipRectLayer(aa with saveLayer) will always be compatible
    auto clip_path_savelayer_bad_child = std::make_shared<ClipRectLayer>(
        clip_rect, Clip::kAntiAliasWithSaveLayer);
    clip_path_savelayer_bad_child->Add(mock1);
    clip_path_savelayer_bad_child->Add(mock2);
 
    // Double check first two children are compatible and non-overlapping
    clip_path_savelayer_bad_child->Preroll(context);
    EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);
 
    // Now add the incompatible child and test again, should still be compatible
    clip_path_savelayer_bad_child->Add(mock4);
    clip_path_savelayer_bad_child->Preroll(context);
    EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);
  }
}
 
TEST_F(ClipRectLayerTest, OpacityInheritancePainting) {
  auto path1 = DlPath::MakeRectLTRB(10, 10, 30, 30);
  auto mock1 = MockLayer::MakeOpacityCompatible(path1);
  auto path2 = DlPath::MakeRectLTRB(40, 40, 50, 50);
  auto mock2 = MockLayer::MakeOpacityCompatible(path2);
  DlRect clip_rect = DlRect::MakeWH(500, 500);
  auto clip_rect_layer =
      std::make_shared<ClipRectLayer>(clip_rect, Clip::kAntiAlias);
  clip_rect_layer->Add(mock1);
  clip_rect_layer->Add(mock2);
 
  // ClipRectLayer will pass through compatibility from multiple
  // non-overlapping compatible children
  PrerollContext* context = preroll_context();
  clip_rect_layer->Preroll(context);
  EXPECT_EQ(context->renderable_state_flags,
            LayerStateStack::kCallerCanApplyOpacity);
 
  int opacity_alpha = 0x7F;
  DlPoint offset = DlPoint(10, 10);
  auto opacity_layer = std::make_shared<OpacityLayer>(opacity_alpha, offset);
  opacity_layer->Add(clip_rect_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.x, offset.y);
      /* ClipRectLayer::Paint() */ {
        expected_builder.Save();
        expected_builder.ClipRect(clip_rect, DlClipOp::kIntersect, true);
        /* child layer1 paint */ {
          expected_builder.DrawPath(path1, DlPaint().setAlpha(opacity_alpha));
        }
        /* child layer2 paint */ {
          expected_builder.DrawPath(path2, DlPaint().setAlpha(opacity_alpha));
        }
        expected_builder.Restore();
      }
    }
    expected_builder.Restore();
  }
 
  opacity_layer->Paint(display_list_paint_context());
  EXPECT_TRUE(DisplayListsEQ_Verbose(expected_builder.Build(), display_list()));
}
 
TEST_F(ClipRectLayerTest, OpacityInheritanceSaveLayerPainting) {
  auto path1 = DlPath::MakeRectLTRB(10, 10, 30, 30);
  auto mock1 = MockLayer::MakeOpacityCompatible(path1);
  auto path2 = DlPath::MakeRectLTRB(20, 20, 40, 40);
  auto mock2 = MockLayer::MakeOpacityCompatible(path2);
  auto children_bounds = path1.GetBounds().Union(path2.GetBounds());
  DlRect clip_rect = DlRect::MakeWH(500, 500);
  auto clip_rect_layer =
      std::make_shared<ClipRectLayer>(clip_rect, Clip::kAntiAliasWithSaveLayer);
  clip_rect_layer->Add(mock1);
  clip_rect_layer->Add(mock2);
 
  // ClipRectLayer will pass through compatibility from multiple
  // non-overlapping compatible children
  PrerollContext* context = preroll_context();
  clip_rect_layer->Preroll(context);
  EXPECT_EQ(context->renderable_state_flags, Layer::kSaveLayerRenderFlags);
 
  int opacity_alpha = 0x7F;
  DlPoint offset = DlPoint(10, 10);
  auto opacity_layer = std::make_shared<OpacityLayer>(opacity_alpha, offset);
  opacity_layer->Add(clip_rect_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.x, offset.y);
      /* ClipRectLayer::Paint() */ {
        expected_builder.Save();
        expected_builder.ClipRect(clip_rect, DlClipOp::kIntersect, true);
        expected_builder.SaveLayer(children_bounds,
                                   &DlPaint().setAlpha(opacity_alpha));
        /* child layer1 paint */ {
          expected_builder.DrawPath(path1, DlPaint());
        }
        /* child layer2 paint */ {  //
          expected_builder.DrawPath(path2, DlPaint());
        }
        expected_builder.Restore();
      }
    }
    expected_builder.Restore();
  }
 
  opacity_layer->Paint(display_list_paint_context());
  EXPECT_TRUE(DisplayListsEQ_Verbose(expected_builder.Build(), display_list()));
}
 
TEST_F(ClipRectLayerTest, LayerCached) {
  auto path1 = DlPath::MakeRectLTRB(10, 10, 30, 30);
  auto mock1 = MockLayer::MakeOpacityCompatible(path1);
  DlRect clip_rect = DlRect::MakeWH(500, 500);
  auto layer =
      std::make_shared<ClipRectLayer>(clip_rect, Clip::kAntiAliasWithSaveLayer);
  layer->Add(mock1);
 
  auto initial_transform = DlMatrix::MakeTranslation({50.0, 25.5});
  DlMatrix 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* clip_cache_item = layer->raster_cache_item();
 
  layer->Preroll(preroll_context());
  LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
 
  EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
  EXPECT_EQ(clip_cache_item->cache_state(), RasterCacheItem::CacheState::kNone);
 
  layer->Preroll(preroll_context());
  LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
  EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)0);
  EXPECT_EQ(clip_cache_item->cache_state(), RasterCacheItem::CacheState::kNone);
 
  layer->Preroll(preroll_context());
  LayerTree::TryToRasterCache(cacheable_items(), &paint_context());
  EXPECT_EQ(raster_cache()->GetLayerCachedEntriesCount(), (size_t)1);
  EXPECT_EQ(clip_cache_item->cache_state(),
            RasterCacheItem::CacheState::kCurrent);
  DlPaint paint;
  EXPECT_TRUE(raster_cache()->Draw(clip_cache_item->GetId().value(),
                                   cache_canvas, &paint));
}
 
TEST_F(ClipRectLayerTest, EmptyClipDoesNotCullPlatformView) {
  const DlPoint view_offset = DlPoint(0.0f, 0.0f);
  const DlSize view_size = DlSize(8.0f, 8.0f);
  const int64_t view_id = 42;
  auto platform_view =
      std::make_shared<PlatformViewLayer>(view_offset, view_size, view_id);
 
  auto clip = std::make_shared<ClipRectLayer>(DlRect(), Clip::kHardEdge);
  clip->Add(platform_view);
 
  auto embedder = MockViewEmbedder();
  DisplayListBuilder fake_overlay_builder;
  embedder.AddCanvas(&fake_overlay_builder);
  preroll_context()->view_embedder = &embedder;
  paint_context().view_embedder = &embedder;
 
  clip->Preroll(preroll_context());
  EXPECT_EQ(embedder.prerolled_views(), std::vector<int64_t>({view_id}));
 
  clip->Paint(paint_context());
  EXPECT_EQ(embedder.painted_views(), std::vector<int64_t>({view_id}));
}
 
}  // namespace testing
}  // namespace flutter
 
// NOLINTEND(bugprone-unchecked-optional-access)