[Impeller] let images with opacity and filters passthrough.

impeller/aiks/aiks_unittests.cc

@@ -1842,5 +1842,37 @@ TEST_P(AiksTest, SceneColorSource) {
   ASSERT_TRUE(OpenPlaygroundHere(callback));
 }
 
+TEST_P(AiksTest, PaintWithFilters) {
+  // validate that a paint with a color filter "HasFilters", no other filters
+  // impact this setting.
+  Paint paint;
+
+  ASSERT_FALSE(paint.HasColorFilter());
+
+  paint.color_filter = [](FilterInput::Ref input) {
+    return ColorFilterContents::MakeBlend(BlendMode::kSourceOver,
+                                          {std::move(input)}, Color::Blue());
+  };
+
+  ASSERT_TRUE(paint.HasColorFilter());
+
+  paint.image_filter = [](const FilterInput::Ref& input,
+                          const Matrix& effect_transform) {
+    return FilterContents::MakeGaussianBlur(
+        input, Sigma(1.0), Sigma(1.0), FilterContents::BlurStyle::kNormal,
+        Entity::TileMode::kClamp, effect_transform);
+  };
+
+  ASSERT_TRUE(paint.HasColorFilter());
+
+  paint.mask_blur_descriptor = {};
+
+  ASSERT_TRUE(paint.HasColorFilter());
+
+  paint.color_filter = std::nullopt;
+
+  ASSERT_FALSE(paint.HasColorFilter());
+}
+
 }  // namespace testing
 }  // namespace impeller

impeller/aiks/canvas.cc

@@ -306,6 +306,7 @@ void Canvas::DrawImageRect(const std::shared_ptr<Image>& image,
   contents->SetSourceRect(source);
   contents->SetSamplerDescriptor(std::move(sampler));
   contents->SetOpacity(paint.color.alpha);
+  contents->SetDeferApplyingOpacity(paint.HasColorFilter());
 
   Entity entity;
   entity.SetBlendMode(paint.blend_mode);

impeller/aiks/paint.cc

@@ -107,4 +107,8 @@ std::shared_ptr<FilterContents> Paint::MaskBlurDescriptor::CreateMaskBlur(
                                             effect_transform);
 }
 
+bool Paint::HasColorFilter() const {
+  return color_filter.has_value();
+}
+
 }  // namespace impeller

impeller/aiks/paint.h

@@ -106,6 +106,9 @@ struct Paint {
   std::shared_ptr<Contents> CreateContentsForGeometry(
       std::unique_ptr<Geometry> geometry) const;
 
+  /// @brief   Whether this paint has a color filter that can apply opacity
+  bool HasColorFilter() const;
+
  private:
   std::shared_ptr<Contents> WithMaskBlur(std::shared_ptr<Contents> input,
                                          bool is_solid_color,