Saves SDL surface to memory in one of the formats supported by Imaging defined by Ext.

function SaveSDLSurfaceToMemory(const Ext: string; 
                                Data: Pointer; 
                                var Size: LongInt; 
                                Surface: PSDL_Surface): Boolean;

ImagingSDL (at line 71)

Size must contain size of available memory before the function is called and memory size taken up by the image is returned in this parameter.