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.

2 files changed, 11 insertions, 0 deletions

diff --git a/src/mbgl/map/map_impl.cpp b/src/mbgl/map/map_impl.cpp
index 42561cf8bf..1ec7255822 100644
--- a/src/mbgl/map/map_impl.cpp
+++ b/src/mbgl/map/map_impl.cpp
@@ -171,4 +171,14 @@ void Map::Impl::jumpTo(const CameraOptions& camera) {
     onUpdate();
 }
 
+void Map::Impl::onStyleImageMissing(const std::string& id, std::function<void()> done) {
+
+    if (style->getImage(id) == nullptr) {
+        observer.onStyleImageMissing(id);
+    }
+
+    done();
+    onUpdate();
+}
+
 } // namespace mbgl
diff --git a/src/mbgl/map/map_impl.hpp b/src/mbgl/map/map_impl.hpp
index 7086148276..f233f78275 100644
--- a/src/mbgl/map/map_impl.hpp
+++ b/src/mbgl/map/map_impl.hpp
@@ -47,6 +47,7 @@ public:
     void onDidFinishRenderingFrame(RenderMode, bool) final;
     void onWillStartRenderingMap() final;
     void onDidFinishRenderingMap() final;
+    void onStyleImageMissing(const std::string&, std::function<void()>) final;
 
     // Map
     void jumpTo(const CameraOptions&);