ac26fe7554
Also, updates some of the mzlib files to point at `racket/*' libraries rather than to `scheme/*' ones.
37 lines
1.0 KiB
Racket
37 lines
1.0 KiB
Racket
#lang scribble/doc
|
|
@(require scribble/manual
|
|
scribble/extract
|
|
(for-label file/gif))
|
|
|
|
@title[#:tag "gif"]{GIF File Writing}
|
|
|
|
@defmodule[file/gif]
|
|
|
|
The @racketmodname[file/gif] library provides functions for
|
|
writing GIF files to a stream, including GIF files with multiple
|
|
images and controls (such as animated GIFs).
|
|
|
|
A GIF stream is created by @racket[gif-start], and then individual
|
|
images are written with @racket[gif-add-image]. Optionally,
|
|
@racket[gif-add-control] inserts instructions for rendering the
|
|
images. The @racket[gif-end] function ends the GIF stream.
|
|
|
|
A GIF stream can be in any one of the following states:
|
|
|
|
@itemize[
|
|
|
|
@item{@racket['init] : no images or controls have been added to the
|
|
stream}
|
|
|
|
@item{@racket['image-or-control] : another image or control can be
|
|
written}
|
|
|
|
@item{@racket['image] : another image can be written (but not a
|
|
control, since a control was written)}
|
|
|
|
@item{@racket['done] : nothing more can be added}
|
|
|
|
]
|
|
|
|
@(include-extracted "../gif.rkt")
|