[][src]Crate gif

GIF en- and decoding library Build Status

GIF en- and decoder written in Rust (API Documentation).

GIF encoding and decoding library

This library provides all functions necessary to de- and encode GIF files.

High level interface

The high level interface consists of the two types Encoder and Decoder. They as builders for the actual en- and decoders and can be used to set various options beforehand.

Decoding GIF files

// Open the file
use std::fs::File;
use gif::SetParameter;
let mut decoder = gif::Decoder::new(File::open("tests/samples/sample_1.gif").unwrap());
// Configure the decoder such that it will expand the image to RGBA.
decoder.set(gif::ColorOutput::RGBA);
// Read the file header
let mut decoder = decoder.read_info().unwrap();
while let Some(frame) = decoder.read_next_frame().unwrap() {
    // Process every frame
}

Encoding GIF files

The encoder can be used so save simple computer generated images:

use gif::{Frame, Encoder, Repeat, SetParameter};
use std::fs::File;
use std::borrow::Cow;
 
let color_map = &[0xFF, 0xFF, 0xFF, 0, 0, 0];
let (width, height) = (6, 6);
let mut beacon_states = [[
    0, 0, 0, 0, 0, 0,
    0, 1, 1, 0, 0, 0,
    0, 1, 1, 0, 0, 0,
    0, 0, 0, 1, 1, 0,
    0, 0, 0, 1, 1, 0,
    0, 0, 0, 0, 0, 0,
], [
    0, 0, 0, 0, 0, 0,
    0, 1, 1, 0, 0, 0,
    0, 1, 0, 0, 0, 0,
    0, 0, 0, 0, 1, 0,
    0, 0, 0, 1, 1, 0,
    0, 0, 0, 0, 0, 0,
]];
let mut image = File::create("tests/samples/beacon.gif").unwrap();;
let mut encoder = Encoder::new(&mut image, width, height, color_map).unwrap();
encoder.set(Repeat::Infinite).unwrap();
for state in &beacon_states {
    let mut frame = Frame::default();
    frame.width = width;
    frame.height = height;
    frame.buffer = Cow::Borrowed(&*state);
    encoder.write_frame(&frame).unwrap();
}

Frame::from_* can be used to convert a true color image to a paletted image with a maximum of 256 colors:

use std::fs::File;
 
// Get pixel data from some source
let mut pixels: Vec<u8> = vec![0; 30_000];
// Create frame from data
let frame = gif::Frame::from_rgb(100, 100, &mut *pixels);
// Create encoder
let mut image = File::create("target/indexed_color.gif").unwrap();
let mut encoder = gif::Encoder::new(&mut image, frame.width, frame.height, &[]).unwrap();
// Write frame to file
encoder.write_frame(&frame).unwrap();

C API

The C API is unstable and widely untested. It can be activated using the feature flag c_api.

Modules

common

Common common used both by decoder and encoder

encoder

Minimal gif encoder

reader
traits

Traits used in this library

Structs

Decoder

GIF decoder

Encoder

GIF encoder.

Frame

A GIF frame

MemoryLimit

Memory limit in bytes. MemoryLimit::Some(0) means that there is no memory limit set.

Reader

GIF decoder

StreamingDecoder

GIF decoder which supports streaming

Enums

Block

Known GIF block types

ColorOutput

Output mode for the image data

Decoded

Indicates whether a certain object has been decoded

DecodingError

Decoding error.

DisposalMethod

Disposal method

Extension

Known GIF extensions

ExtensionData

Extension data.

Extensions

Configures how extensions should be handled

Repeat

Number of repetitions

Traits

Parameter

Configuration parameter trait.

SetParameter

Implemented for objects that have parameters.