[core] fix backend scope handling on render, cleanup and lowmemory

- Make renderer frontend responsible for creating a BackendScope on render
- encapsulate backend scope handling on cleanup and low memory in renderer impl

1 files changed, 4 insertions, 4 deletions

diff --git a/src/mbgl/renderer/renderer_impl.cpp b/src/mbgl/renderer/renderer_impl.cpp
index 981c09e806..4c45ab167d 100644
--- a/src/mbgl/renderer/renderer_impl.cpp
+++ b/src/mbgl/renderer/renderer_impl.cpp
@@ -35,7 +35,7 @@ Renderer::Impl::Impl(RendererBackend& backend_,
 }
 
 Renderer::Impl::~Impl() {
-    BackendScope guard { backend, backend.getScopeType()};
+    BackendScope guard { backend };
     renderStyle.reset();
     staticData.reset();
 };
@@ -47,8 +47,8 @@ void Renderer::Impl::setObserver(RendererObserver* observer_) {
 void Renderer::Impl::render(View& view, const UpdateParameters& updateParameters) {
     // Don't load/render anyting in still mode until explicitly requested.
     if (updateParameters.mode == MapMode::Still && !updateParameters.stillImageRequest) return;
-
-    BackendScope guard { backend, backend.getScopeType() };
+    
+    assert(BackendScope::exists());
 
     renderStyle->update(updateParameters);
     transformState = updateParameters.transformState;
@@ -348,7 +348,7 @@ void Renderer::Impl::onResourceError(std::exception_ptr ptr) {
 }
 
 void Renderer::Impl::onLowMemory() {
-    BackendScope guard { backend, backend.getScopeType() };
+    BackendScope guard { backend };
     backend.getContext().performCleanup();
     renderStyle->onLowMemory();
     observer->onInvalidate();