type, which is currently "jpeg",
"tiff", "png", "ico" or "bmp". See gdkPixbufSaveToBuffer for more details.gdkPixbufSaveToBufferv(object, type, option.keys, option.values, .errwarn = TRUE)typeoption.keysNULL-terminatedoption.valuesbuffer.sizetypeoption.keysNULL-terminatedoption.valueserrorGError] return location for error, or NULL