Graphic Control Extension block, used for setting up disposal method, transparency, delay and user input.
userInput:Bool
Is image must wait for user input, before dispose? This flag may be used by user-defined program but absolutely ignored by any Gif players.
delay:Int
Delay, before next image appears. Delay is in centiseconds (1 centisecond = 1/100 seconds).
Note: Some players (like FastStone) cut fraction of elapsed time when progressing to next frame which results in small timing error.
Recommended to use time -= delay
instead of time = 0
.