The image data, in any format accepted by MapLibre's addImage. Asynchronous
sources (URLs, SVG strings) are not supported here — pre-load them and pass an
HTMLImageElement (or ImageBitmap/ImageData) instead.
OptionaloptionsMapLibre image metadata: pixelRatio, sdf, stretchX, stretchY, content.
Forwarded verbatim to addImage.
Specification for a single custom image registered on the map by a CustomGeoJSONModule. The module re-registers every image automatically after every style change, so symbol layers in CustomGeoJSONSourceSpec.layers can reference an image by ID and survive
setStylecalls without extra wiring.