New in version 5.6.
See the Image Response Provider Example for a complete implementation.
Implement this method to return the job that will provide the texture with
id is the requested image source, with the “image:” scheme and provider identifier removed. For example, if the image source was “image://myprovider/icons/home”, the given
id would be “icons/home”.
requestedSize corresponds to the Image::sourceSize requested by an Image item. If
requestedSize is a valid size, the image returned should be of that size.
this method may be called by multiple threads, so ensure the implementation of this method is reentrant.