[core] Track missing style images that were provided by client

- Track images provided by client thruough onStyleImageMissing API
- Handle reduceMemoryUsage in ImageManager, via Renderer API
- Release client provided images when no tiles are using them

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mbgl/renderer/renderer_impl.cpp b/src/mbgl/renderer/renderer_impl.cpp
index 4ba1fc6bbc..9f376e7cf5 100644
--- a/src/mbgl/renderer/renderer_impl.cpp
+++ b/src/mbgl/renderer/renderer_impl.cpp
@@ -685,6 +685,9 @@ void Renderer::Impl::reduceMemoryUse() {
     }
     backend.getContext().performCleanup();
     observer->onInvalidate();
+    if (imageManager) {
+        imageManager->reduceMemoryUse();
+    }
 }
 
 void Renderer::Impl::dumDebugLogs() {