[core] Add ImageManager::clear()

src/mbgl/renderer/image_manager.cpp

@@ -175,6 +175,17 @@ const std::set<std::string>& ImageManager::getAvailableImages() const {
     return availableImages;
 }
 
+void ImageManager::clear() {
+    assert(requestors.empty());
+    assert(missingImageRequestors.empty());
+
+    images.clear();
+    availableImages.clear();
+    updatedImageVersions.clear();
+    requestedImages.clear();
+    loaded = false;
+}
+
 void ImageManager::checkMissingAndNotify(ImageRequestor& requestor, const ImageRequestPair& pair) {
     ImageDependencies missingDependencies;
 

src/mbgl/renderer/image_manager.hpp

@@ -51,6 +51,8 @@ public:
 
     ImageVersionMap updatedImageVersions;
 
+    void clear();
+
 private:
     void checkMissingAndNotify(ImageRequestor&, const ImageRequestPair&);
     void notify(ImageRequestor&, const ImageRequestPair&) const;

src/mbgl/renderer/render_orchestrator.cpp

@@ -702,6 +702,7 @@ bool RenderOrchestrator::isLoaded() const {
 void RenderOrchestrator::clearData() {
     if (!sourceImpls->empty()) sourceImpls = makeMutable<std::vector<Immutable<style::Source::Impl>>>();
     if (!layerImpls->empty()) layerImpls = makeMutable<std::vector<Immutable<style::Layer::Impl>>>();
+    if (!imageImpls->empty()) imageImpls = makeMutable<std::vector<Immutable<style::Image::Impl>>>();
 
     renderSources.clear();
     renderLayers.clear();
@@ -710,6 +711,8 @@ void RenderOrchestrator::clearData() {
 
     if (!lineAtlas->isEmpty()) lineAtlas = std::make_unique<LineAtlas>();
     if (!patternAtlas->isEmpty()) patternAtlas = std::make_unique<PatternAtlas>();
+
+    imageManager->clear();
 }
 
 void RenderOrchestrator::onGlyphsError(const FontStack& fontStack, const GlyphRange& glyphRange, std::exception_ptr error) {