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https://github.com/square/gifencoder

A pure Java library implementing the GIF89a specification. Suitable for use on Android.
https://github.com/square/gifencoder

Last synced: 5 days ago
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A pure Java library implementing the GIF89a specification. Suitable for use on Android.

Host: GitHub
URL: https://github.com/square/gifencoder
Owner: square
License: apache-2.0
Created: 2016-11-29T03:32:18.000Z (almost 8 years ago)
Default Branch: master
Last Pushed: 2023-05-09T21:15:01.000Z (over 1 year ago)
Last Synced: 2024-04-13T17:52:12.820Z (7 months ago)
Language: Java
Homepage:
Size: 1.65 MB
Stars: 655
Watchers: 19
Forks: 74
Open Issues: 3
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE.txt

Awesome Lists containing this project

README

        # gifencoder

gifencoder is a pure Java library implementing the [GIF89a specification](http://www.w3.org/Graphics/GIF/spec-gif89a.txt). It does not use AWT's `BufferedImage`, so it can be used on Android and other platforms lacking AWT.

There is currently no support for transparency.

### Quantization and dithering

GIF images are limited to 256 colors. If you supply an image with more colors, gifencoder's default behavior is to perform [median-cut quantization](http://en.wikipedia.org/wiki/Median_cut) with [Floyd-Steinberg dithering](http://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering). You can configure this behavior through `ImageOptions`. A handful of quantizers and ditherers are provided, but you can also plug in your own implementation.

### Basic usage

```java

int[][] rgbDataFrame1 = ...;

int[][] rgbDataFrame2 = ...;

int[][] rgbDataFrame3 = ...;

OutputStream outputStream = new FileOutputStream("test.gif");

ImageOptions options = new ImageOptions();

new GifEncoder(outputStream, width, height, 0)

        .addImage(rgbDataFrame1, options)

        .addImage(rgbDataFrame2, options)

        .addImage(rgbDataFrame3, options)

        .finishEncoding();

outputStream.close();

```

### Download

Gradle:

```groovy

compile 'com.squareup:gifencoder:0.10.1'

```

Maven:

```xml

  com.squareup

  gifencoder

  0.10.1

```

Or download [the latest JAR][jar]. 

Snapshots of the development version are available in [Sonatype's `snapshots` repository][snap].

### Gallery

Simple animation with median-cut quantization and Floyd-Steinberg dithering:

![simple animation](gallery/simple-animation.gif)

Lenna, original PNG:

![Lenna original](gallery/lenna-original.png)

Lenna with uniform quantization and Floyd-Steinberg dithering:

![Lenna with uniform quantization and Floyd-Steinberg dithering](gallery/lenna-uniform.gif)

Lenna GIF with median-cut quantization and Floyd-Steinberg dithering:

![Lenna with median-cut quantization and Floyd-Steinberg dithering](gallery/lenna-median-cut.gif)

Lenna GIF with k-means quantization and Floyd-Steinberg dithering:

![Lenna with k-means quantization and Floyd-Steinberg dithering](gallery/lenna-k-means.gif)

License

=======

    Copyright 2015 Square, Inc.

    Licensed under the Apache License, Version 2.0 (the "License");

    you may not use this file except in compliance with the License.

    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software

    distributed under the License is distributed on an "AS IS" BASIS,

    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    See the License for the specific language governing permissions and

    limitations under the License.

 [jar]: https://search.maven.org/remote_content?g=com.squareup&a=gifencoder&v=LATEST

 [snap]: https://oss.sonatype.org/content/repositories/snapshots/