| Value | Description |
|---|---|
| ioGIF_None | Do nothing: Subsequent frame will be a full size non-transparent frame |
| ioGIF_DontRemove | Leave as is: Subsequent frame will be a copy of the previous one. Any pixels not covered by the new frame continue to display. Use this method if you are using transparency within frames |
| ioGIF_DrawBackground | Fill with background color: The GIF Background color shows through any transparent pixels of the new frame |
| ioGIF_RestorePrev | Restore previous full frame: Subsequent frame will be a copy of the last full frame |