Add comment in rasterizer

Emmanuel Garcia · Emmanuel Garcia · commit 2534dfdaf494 · 2020-07-06T09:16:00.000-07:00
diff --git a/shell/common/rasterizer.cc b/shell/common/rasterizer.cc
@@ -392,6 +392,10 @@ RasterStatus Rasterizer::DrawToSurface(flutter::LayerTree& layer_tree) {
     embedder_root_canvas = external_view_embedder->GetRootCanvas();
   }
 
+  // On Android, the external view embedder deletes surfaces in `BeginFrame`.
+  //
+  // Deleting a surface also clears the GL context. Therefore, acquire the
+  // frame, after calling `BeginFrame` as this operation resets the GL context.
   auto frame = surface_->AcquireFrame(layer_tree.frame_size());
 
   if (frame == nullptr) {

Original file line number	Diff line number	Diff line change
`@@ -392,6 +392,10 @@ RasterStatus Rasterizer::DrawToSurface(flutter::LayerTree& layer_tree) {`
`392`	`392`	`embedder_root_canvas = external_view_embedder->GetRootCanvas();`
`393`	`393`	`}`
`394`	`394`
	`395`	+ // On Android, the external view embedder deletes surfaces in `BeginFrame`.
	`396`	`+ //`
	`397`	`+ // Deleting a surface also clears the GL context. Therefore, acquire the`
	`398`	+ // frame, after calling `BeginFrame` as this operation resets the GL context.
`395`	`399`	`auto frame = surface_->AcquireFrame(layer_tree.frame_size());`
`396`	`400`
`397`	`401`	`if (frame == nullptr) {`