How do I load a GIF-image from computer in Haskell?

Question

I want to have a GIF-image looping in the background of a game (For example with Gloss Juicy or module Codec.Picture.Gif)

Managed to work with a BMP image like this:

image :: IO Picture 
image = loadBMP "image.bmp"

But now I want to do the same with a GIF image:

loadGifFile :: FilePath -> IO Image 
loadGifFile = "image.gif"

Can't get it to work.

Thankful for any tip how to do it.

[Hoogle says](https://hoogle.haskell.org/?hoogle=loadBMP): `loadBMP :: FilePath -> IO Picture`. — Will Ness, Feb 26 '19 at 11:55
Why are you assigning "image.gif" to loadGifFile instead of passing it as an argument? — jaroslawj, Feb 26 '19 at 13:21

score 2 · Answer 1 · answered Feb 26 '19 at 16:18

You are going to have to do some more work. loadBMP just loads a BMP file into a bitmap, which is a single image. However an animated GIF is a more complex file format which has several frames in it. GLOSS simply doesn't support that out of the box.

You could use JuicyPixels to decode a GIF file and then write some code to convert that into a list of GLOSS Bitmaps. Then use animate to draw those images in sequence.

How do I load a GIF-image from computer in Haskell?

1 Answers1