[Impeller] Fix the clip replay mechanism.

impeller/entity/entity_pass.cc

@@ -721,12 +721,7 @@ bool EntityPass::RenderElement(Entity& element_entity,
     return false;
   }
 
-  // If the pass context returns a backdrop texture, we need to draw it to the
-  // current pass. We do this because it's faster and takes significantly less
-  // memory than storing/loading large MSAA textures. Also, it's not possible to
-  // blit the non-MSAA resolve texture of the previous pass to MSAA textures
-  // (let alone a transient one).
-  if (result.backdrop_texture) {
+  if (result.just_created) {
     // Restore any clips that were recorded before the backdrop filter was
     // applied.
     auto& replay_entities = clip_replay_->GetReplayEntities();
@@ -735,7 +730,14 @@ bool EntityPass::RenderElement(Entity& element_entity,
         VALIDATION_LOG << "Failed to render entity for clip restore.";
       }
     }
+  }
 
+  // If the pass context returns a backdrop texture, we need to draw it to the
+  // current pass. We do this because it's faster and takes significantly less
+  // memory than storing/loading large MSAA textures. Also, it's not possible to
+  // blit the non-MSAA resolve texture of the previous pass to MSAA textures
+  // (let alone a transient one).
+  if (result.backdrop_texture) {
     auto size_rect = Rect::MakeSize(result.pass->GetRenderTargetSize());
     auto msaa_backdrop_contents = TextureContents::MakeRect(size_rect);
     msaa_backdrop_contents->SetStencilEnabled(false);

impeller/entity/inline_pass_context.cc

@@ -187,6 +187,7 @@ InlinePassContext::RenderPassResult InlinePassContext::GetRenderPass(
       " Count=" + std::to_string(pass_count_));
 
   result.pass = pass_;
+  result.just_created = true;
 
   if (!renderer_.GetContext()->GetCapabilities()->SupportsReadFromResolve() &&
       result.backdrop_texture ==

impeller/entity/inline_pass_context.h

@@ -17,6 +17,7 @@ namespace impeller {
 class InlinePassContext {
  public:
   struct RenderPassResult {
+    bool just_created = false;
     std::shared_ptr<RenderPass> pass;
     std::shared_ptr<Texture> backdrop_texture;
   };