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, 2 insertions, 0 deletions

diff --git a/src/mbgl/style/image_impl.hpp b/src/mbgl/style/image_impl.hpp
index 54b5e6487b..b2decbf781 100644
--- a/src/mbgl/style/image_impl.hpp
+++ b/src/mbgl/style/image_impl.hpp
@@ -34,5 +34,6 @@ enum class ImageType : bool {
 using ImageMap = std::unordered_map<std::string, Immutable<style::Image::Impl>>;
 using ImageDependencies = std::unordered_map<std::string, ImageType>;
 using ImageRequestPair = std::pair<ImageDependencies, uint64_t>;
+using ImageVersionMap = std::unordered_map<std::string, uint32_t>;
 
 } // namespace mbgl
diff --git a/src/mbgl/style/style_impl.cpp b/src/mbgl/style/style_impl.cpp
index d65e9c9de2..fde5aa632d 100644
--- a/src/mbgl/style/style_impl.cpp
+++ b/src/mbgl/style/style_impl.cpp
@@ -254,6 +254,7 @@ bool Style::Impl::isLoaded() const {
 void Style::Impl::addImage(std::unique_ptr<style::Image> image) {
     images.remove(image->getID()); // We permit using addImage to update.
     images.add(std::move(image));
+    observer->onUpdate();
 }
 
 void Style::Impl::removeImage(const std::string& id) {