add onStyleImageMissing to allow dynamically loaded or generated images (#14253)

Also make `Style#updateImage(...)` much faster when the image doesn't change size. This can be useful for asynchronously generating images.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/mbgl/renderer/image_manager_observer.hpp b/src/mbgl/renderer/image_manager_observer.hpp
new file mode 100644
index 0000000000..3dc53c9b66
--- /dev/null
+++ b/src/mbgl/renderer/image_manager_observer.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <mbgl/renderer/renderer_observer.hpp>
+
+namespace mbgl {
+
+class ImageManagerObserver {
+public:
+    virtual ~ImageManagerObserver() = default;
+
+    virtual void onStyleImageMissing(const std::string&, std::function<void()> done) { done(); }
+};
+
+} // namespace mbgl