[Impeller] EntityPass::Clone needs to clone harder (#45313)

Fixes flutter/flutter#133731

Author: Jonah Williams

impeller/aiks/aiks_unittests.cc

@@ -3119,6 +3119,42 @@ TEST_P(AiksTest, CanCanvasDrawPicture) {
   ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
 }
 
+TEST_P(AiksTest, CanCanvasDrawPictureWithAdvancedBlend) {
+  Canvas subcanvas;
+  subcanvas.DrawRect(
+      Rect::MakeLTRB(-100, -50, 100, 50),
+      {.color = Color::CornflowerBlue(), .blend_mode = BlendMode::kColorDodge});
+  auto picture = subcanvas.EndRecordingAsPicture();
+
+  Canvas canvas;
+  canvas.Translate({200, 200});
+  canvas.DrawPicture(picture);
+
+  ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
+}
+
+TEST_P(AiksTest, CanCanvasDrawPictureWithBackdropFilter) {
+  Canvas subcanvas;
+  subcanvas.SaveLayer({}, {},
+                      [](const FilterInput::Ref& input,
+                         const Matrix& effect_transform, bool is_subpass) {
+                        return FilterContents::MakeGaussianBlur(
+                            input, Sigma(20.0), Sigma(20.0));
+                      });
+  auto image = std::make_shared<Image>(CreateTextureForFixture("kalimba.jpg"));
+  Paint paint;
+  paint.color = Color::Red();
+  subcanvas.DrawImage(image, Point::MakeXY(100.0, 100.0), paint);
+
+  auto picture = subcanvas.EndRecordingAsPicture();
+
+  Canvas canvas;
+  canvas.Translate({200, 200});
+  canvas.DrawPicture(picture);
+
+  ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
+}
+
 TEST_P(AiksTest, DrawPictureWithText) {
   Canvas subcanvas;
   ASSERT_TRUE(RenderTextInCanvasSkia(

impeller/aiks/canvas.cc

@@ -527,9 +527,9 @@ void Canvas::SaveLayer(const Paint& paint,
   // Only apply opacity peephole on default blending.
   if (paint.blend_mode == BlendMode::kSourceOver) {
     new_layer_pass.SetDelegate(
-        std::make_unique<OpacityPeepholePassDelegate>(paint));
+        std::make_shared<OpacityPeepholePassDelegate>(paint));
   } else {
-    new_layer_pass.SetDelegate(std::make_unique<PaintPassDelegate>(paint));
+    new_layer_pass.SetDelegate(std::make_shared<PaintPassDelegate>(paint));
   }
 }
 

impeller/entity/entity_pass.cc

@@ -59,7 +59,7 @@ EntityPass::EntityPass() = default;
 
 EntityPass::~EntityPass() = default;
 
-void EntityPass::SetDelegate(std::unique_ptr<EntityPassDelegate> delegate) {
+void EntityPass::SetDelegate(std::shared_ptr<EntityPassDelegate> delegate) {
   if (!delegate) {
     return;
   }
@@ -1020,6 +1020,16 @@ std::unique_ptr<EntityPass> EntityPass::Clone() const {
 
   auto pass = std::make_unique<EntityPass>();
   pass->SetElements(std::move(new_elements));
+  pass->backdrop_filter_reads_from_pass_texture_ =
+      backdrop_filter_reads_from_pass_texture_;
+  pass->advanced_blend_reads_from_pass_texture_ =
+      advanced_blend_reads_from_pass_texture_;
+  pass->backdrop_filter_proc_ = backdrop_filter_proc_;
+  pass->blend_mode_ = blend_mode_;
+  pass->delegate_ = delegate_;
+  // Note: I tried also adding flood clip and bounds limit but one of the
+  // two caused rendering in wonderous to break. It's 10:51 PM, and I'm
+  // ready to move on.
   return pass;
 }
 

impeller/entity/entity_pass.h

@@ -54,7 +54,7 @@ class EntityPass {
 
   ~EntityPass();
 
-  void SetDelegate(std::unique_ptr<EntityPassDelegate> delgate);
+  void SetDelegate(std::shared_ptr<EntityPassDelegate> delgate);
 
   /// @brief  Set the bounds limit, which is provided by the user when creating
   ///         a SaveLayer. This is a hint that allows the user to communicate
@@ -279,7 +279,7 @@ class EntityPass {
 
   BackdropFilterProc backdrop_filter_proc_ = nullptr;
 
-  std::unique_ptr<EntityPassDelegate> delegate_ =
+  std::shared_ptr<EntityPassDelegate> delegate_ =
       EntityPassDelegate::MakeDefault();
 
   FML_DISALLOW_COPY_AND_ASSIGN(EntityPass);