[Impeller] experimental canvas bdf support.

impeller/aiks/experimental_canvas.h

@@ -18,6 +18,18 @@
 
 namespace impeller {
 
+struct LazyRenderingConfig {
+  std::unique_ptr<EntityPassTarget> entity_pass_target;
+  std::unique_ptr<InlinePassContext> inline_pass_context;
+
+  LazyRenderingConfig(ContentContext& renderer,
+                      std::unique_ptr<EntityPassTarget> p_entity_pass_target)
+      : entity_pass_target(std::move(p_entity_pass_target)) {
+    inline_pass_context =
+        std::make_unique<InlinePassContext>(renderer, *entity_pass_target, 0);
+  }
+};
+
 /// This Canvas attempts to translate from display lists to draw calls directly.
 ///
 /// It's not fully implemented yet but if successful it will be replacing the
@@ -78,10 +90,8 @@ class ExperimentalCanvas : public Canvas {
   RenderTarget& render_target_;
   const bool requires_readback_;
   EntityPassClipStack clip_coverage_stack_;
-  std::vector<std::unique_ptr<InlinePassContext>> inline_pass_contexts_;
-  std::vector<std::unique_ptr<EntityPassTarget>> entity_pass_targets_;
+  std::vector<LazyRenderingConfig> render_passes_;
   std::vector<SaveLayerState> save_layer_state_;
-  std::vector<std::shared_ptr<RenderPass>> render_passes_;
 
   void SetupRenderPass();
 

impeller/aiks/image_filter.h

@@ -87,6 +87,8 @@ class ImageFilter {
   virtual std::shared_ptr<ImageFilter> Clone() const = 0;
 
   virtual void Visit(ImageFilterVisitor& visitor) = 0;
+
+  virtual int GetRequiredMipCount() const { return 1; }
 };
 
 /*******************************************************************************
@@ -112,6 +114,8 @@ class BlurImageFilter : public ImageFilter {
   // |ImageFilter|
   void Visit(ImageFilterVisitor& visitor) override { visitor.Visit(*this); }
 
+  int GetRequiredMipCount() const override { return 4; }
+
  private:
   Sigma sigma_x_;
   Sigma sigma_y_;

impeller/display_list/dl_dispatcher.cc

@@ -1313,10 +1313,12 @@ void TextFrameDispatcher::drawTextFrame(
   if (text_frame->HasColor()) {
     properties.color = paint_.color;
   }
-  renderer_.GetLazyGlyphAtlas()->AddTextFrame(*text_frame,                    //
-                                              matrix_.GetMaxBasisLengthXY(),  //
-                                              Point(x, y),                    //
-                                              properties                      //
+  auto scale =
+      (matrix_ * Matrix::MakeTranslation(Point(x, y))).GetMaxBasisLengthXY();
+  renderer_.GetLazyGlyphAtlas()->AddTextFrame(*text_frame,  //
+                                              scale,        //
+                                              Point(x, y),  //
+                                              properties    //
   );
 }
 

impeller/display_list/dl_playground.cc

@@ -15,7 +15,7 @@
 #include "third_party/skia/include/core/SkTypeface.h"
 #include "txt/platform.h"
 
-#define ENABLE_EXPERIMENTAL_CANVAS false
+#define ENABLE_EXPERIMENTAL_CANVAS true
 
 namespace impeller {
 
@@ -56,8 +56,8 @@ bool DlPlayground::OpenPlaygroundHere(DisplayListPlaygroundCallback callback) {
 
         ExperimentalDlDispatcher impeller_dispatcher(
             context.GetContentContext(), render_target,
-            display_list->root_has_backdrop_filter(),
-            display_list->max_root_blend_mode(), IRect::MakeMaximum());
+            list->root_has_backdrop_filter(), list->max_root_blend_mode(),
+            IRect::MakeMaximum());
         list->Dispatch(impeller_dispatcher);
         impeller_dispatcher.FinishRecording();
         context.GetContentContext().GetTransientsBuffer().Reset();

impeller/entity/entity_pass_clip_stack.cc

@@ -3,8 +3,8 @@
 // found in the LICENSE file.
 
 #include "impeller/entity/entity_pass_clip_stack.h"
+#include "fml/logging.h"
 #include "impeller/entity/contents/clip_contents.h"
-#include "impeller/entity/contents/content_context.h"
 #include "impeller/entity/entity.h"
 
 namespace impeller {
@@ -22,6 +22,12 @@ EntityPassClipStack::EntityPassClipStack(const Rect& initial_coverage_rect) {
 }
 
 std::optional<Rect> EntityPassClipStack::CurrentClipCoverage() const {
+  if (subpass_state_.empty()) {
+    return std::nullopt;
+  }
+  if (subpass_state_.back().clip_coverage.empty()) {
+    return std::nullopt;
+  }
   return subpass_state_.back().clip_coverage.back().coverage;
 }
 
@@ -42,6 +48,7 @@ void EntityPassClipStack::PushSubpass(std::optional<Rect> subpass_coverage,
 
 void EntityPassClipStack::PopSubpass() {
   subpass_state_.pop_back();
+  FML_CHECK(!subpass_state_.empty());
 }
 
 const std::vector<ClipCoverageLayer>

shell/gpu/gpu_surface_metal_impeller.mm

@@ -17,7 +17,7 @@
 
 static_assert(!__has_feature(objc_arc), "ARC must be disabled.");
 
-#define ENABLE_EXPERIMENTAL_CANVAS false
+#define ENABLE_EXPERIMENTAL_CANVAS true
 
 namespace flutter {
 
@@ -293,7 +293,9 @@
             fml::MakeCopyable([aiks_context, &display_list, &cull_rect,
                                &sk_cull_rect](impeller::RenderTarget& render_target) -> bool {
               impeller::ExperimentalDlDispatcher impeller_dispatcher(
-                  aiks_context->GetContentContext(), render_target, cull_rect);
+                  aiks_context->GetContentContext(), render_target,
+                  display_list->root_has_backdrop_filter(), display_list->max_root_blend_mode(),
+                  cull_rect);
               display_list->Dispatch(impeller_dispatcher, sk_cull_rect);
               impeller_dispatcher.FinishRecording();
               aiks_context->GetContentContext().GetTransientsBuffer().Reset();