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| 1 | |
| 2 # gif.js | |
| 3 | |
| 4 JavaScript GIF encoder that runs in your browser. | |
| 5 | |
| 6 Uses typed arrays and web workers to render each frame in the background, it's r
eally fast! | |
| 7 | |
| 8 **Demo** - http://jnordberg.github.io/gif.js/ | |
| 9 | |
| 10 Works in browsers supporting: [Web Workers](http://www.w3.org/TR/workers/), [Fil
e API](http://www.w3.org/TR/FileAPI/) and [Typed Arrays](https://www.khronos.org
/registry/typedarray/specs/latest/) | |
| 11 | |
| 12 Tested in | |
| 13 * Google Chrome | |
| 14 * Firefox 17 | |
| 15 * Safari 6 | |
| 16 * Internet Explorer 10 | |
| 17 * Mobile Safari iOS 6 | |
| 18 | |
| 19 ## Usage | |
| 20 | |
| 21 Include `gif.js` found in `dist/` in your page. Also make sure to have `gif.work
er.js` in the same location. | |
| 22 | |
| 23 ```javascript | |
| 24 var gif = new GIF({ | |
| 25 workers: 2, | |
| 26 quality: 10 | |
| 27 }); | |
| 28 | |
| 29 // add a image element | |
| 30 gif.addFrame(imageElement); | |
| 31 | |
| 32 // or a canvas element | |
| 33 gif.addFrame(canvasElement, {delay: 200}); | |
| 34 | |
| 35 // or copy the pixels from a canvas context | |
| 36 gif.addFrame(ctx, {copy: true}); | |
| 37 | |
| 38 gif.on('finished', function(blob) { | |
| 39 window.open(URL.createObjectURL(blob)); | |
| 40 }); | |
| 41 | |
| 42 gif.render(); | |
| 43 ``` | |
| 44 | |
| 45 ## Options | |
| 46 | |
| 47 Options can be passed to the constructor or using the `setOptions` method. | |
| 48 | |
| 49 | Name | Default | Description
| | |
| 50 | -------------|-----------------|----------------------------------------------
------| | |
| 51 | repeat | `0` | repeat count, `-1` = no repeat, `0` = forever
| | |
| 52 | quality | `10` | pixel sample interval, lower is better
| | |
| 53 | workers | `2` | number of web workers to spawn
| | |
| 54 | workerScript | `gif.worker.js` | url to load worker script from
| | |
| 55 | background | `#fff` | background color where source image is transp
arent | | |
| 56 | width | `null` | output image width
| | |
| 57 | height | `null` | output image height
| | |
| 58 | transparent | `null` | transparent hex color, `0x00FF00` = green
| | |
| 59 | |
| 60 If width or height is `null` image size will be deteremined by first frame added
. | |
| 61 | |
| 62 ### addFrame options | |
| 63 | |
| 64 | Name | Default | Description
| | |
| 65 | -------------|-----------------|----------------------------------------------
------| | |
| 66 | delay | `500` | frame delay
| | |
| 67 | copy | `false` | copy the pixel data
| | |
| 68 | |
| 69 ## Wishlist | |
| 70 | |
| 71 If you want to contribute, here's some stuff that would be nice to have. | |
| 72 | |
| 73 * Tests | |
| 74 * Fallbacks and polyfills for old browsers | |
| 75 * Dithering! | |
| 76 | |
| 77 ## Acknowledgements | |
| 78 | |
| 79 gif.js is based on: | |
| 80 | |
| 81 * [Kevin Weiner's Animated gif encoder classes](http://www.fmsware.com/stuff/gi
f.html) | |
| 82 * [Neural-Net color quantization algorithm by Anthony Dekker](http://members.oz
email.com.au/~dekker/NEUQUANT.HTML) | |
| 83 * [Thibault Imbert's as3gif](https://code.google.com/p/as3gif/) | |
| 84 | |
| 85 ## License | |
| 86 | |
| 87 The MIT License (MIT) | |
| 88 | |
| 89 Copyright (c) 2013 Johan Nordberg | |
| 90 | |
| 91 Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 92 of this software and associated documentation files (the "Software"), to deal | |
| 93 in the Software without restriction, including without limitation the rights | |
| 94 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| 95 copies of the Software, and to permit persons to whom the Software is | |
| 96 furnished to do so, subject to the following conditions: | |
| 97 | |
| 98 The above copyright notice and this permission notice shall be included in | |
| 99 all copies or substantial portions of the Software. | |
| 100 | |
| 101 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 102 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 103 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 104 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 105 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| 106 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| 107 THE SOFTWARE. | |
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