Code archives/Graphics/LoadAnimGif

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LoadAnimGif by Peter Scheutz
(Posted 24 years ago)
Load animated GIF and returns an animImage.
Stores number of frames in gifframecount global var. 
; Animated Gif file loader by Peter Scheutz 2003.03.13
; Load animated Gif and returns an animImage
; Stores number of frames in gifframecount

Global gifframecount

; useage:
myanim=LoadAnimGif("mygif.gif")



Function LoadAnimGif(fname$)

	Local fbank
	Local f
	Local thegif
	Local animPic
	Local count
	Local framecount
	fbank=CreateBank(FileSize(fname$))

	f=OpenFile(fname$)
		ReadBytes fbank,f,0,BankSize(fbank)
	CloseFile f
	
	; This is a quick hack and not quite good enough,
	; as it could count too many frames
	; Works for all the gifs I tested though...
	; Looks for "Gif magic marker"
	For n=0 To BankSize(fbank)-1
		If PeekByte(fbank,n)=0
		If PeekByte(fbank,n+1)=33
		If PeekByte(fbank,n+2)=249
			;DebugLog "Gif Magic found at: " + n
			framecount=framecount+1
		EndIf
		EndIf
		EndIf
	
	Next

	FreeBank fbank

	thegif=OpenMovie(fname$)

	animPic=CreateImage(MovieWidth(thegif),MovieHeight(thegif),framecount)

	SetBuffer BackBuffer()
	
	count=0
	While MoviePlaying(thegif) And count<framecount
		DrawMovie thegif,0,0	
		GrabImage animPic,0,0,count
		count=count+1
	Wend

	CloseMovie thegif
	
	Cls
	Flip

	; store framecount in global variable
	gifframecount=framecount

	Return animPic

End Function

Comments

(tu) ENAY
(Posted 19 years ago)
There is a bug in this code, since DrawMovie is being used to draw to the BackBuffer it only draws to the size of the chosen screen resolution (defined by you)
Therefore if your gif is bigger then the screen you will have parts of your gif missing. Simply render to the imagebuffer instead of the backbuffer.

Replace:-
SetBuffer BackBuffer()

with
SetBuffer ImageBuffer(animPic)


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