req should be an roTextureRequest. Makes a request for an roBitmap with the attributes specified by the roTextureRequest. The roTextureManager will pass an roTextureRequestEvent to the message port when completed.
Cancels the request specified by req, which should be an roTextureRequest previously passed to RequestTexture().
Removes a bitmap from the roTextureManager with the specified URL.
Removes all bitmaps from the roTextureManager.