gifencoder

A gif encoder written in Dart.

Usage

To create a regular GIF:

import 'dart:html';
import 'package:gifencoder/gifencoder.dart';

int width = ...;
int height = ...;
var ctx = new CanvasElement(width: width, height: height).context2D;
// draw your image in the canvas context
var data = ctx.getImageData(0, 0, width, height);
List<int> bytes = gifencoder.makeGif(width, height, data.data)

To create an animated Gif, use a GifBuffer instead:

int framesPerSecond = ...;
var frames = new gifencoder.GifBuffer(width, height);
for (var i = 0; i < myFrameCount; i++) {
    // draw the next frame on the canvas context
    frames.add(ctx.getImageData(0, 0, width, height).data);
}
List<int> bytes = frames.build(framesPerSecond);

Once you have the bytes of the GIF, you can save it somewhere or convert it into a data URL. See example/example.dart for how to do that. You can run the example by running the following: pub run build_runner serve and then connecting to localhost in the browser on port 8081.

Testing

To test in the VM:

pub run test -p vm

To run browser tests in Chrome:

pub run build_runner test --release -- -p chrome

You can also access the tests from a browser by running pub run build_runner serve and then connecting to localhost in the browser on port 8080.