GIF support#102
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New decode-only package using giflib to decode GIF images to ImageData, following the same WASM + Emscripten pattern as existing codecs. Decodes the first frame of animated GIFs with transparency support. Compiled WASM is only ~21KB since giflib is lightweight. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- decodeAnimated(): returns array of {imageData, duration} for each frame
with proper disposal method handling (background restore, previous restore)
- isAnimated(): returns boolean indicating if GIF has multiple frames
- decode() still returns first frame as ImageData (unchanged)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Checks for GIF87a/GIF89a header and throws a clear error message when the file is not a valid GIF (e.g. a WebP with a .gif extension). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Thanks @xfalcox. This is awesome. If it's ok, I'll take a look at these PRs over the weekend and get back to you with any comments 🙏 To help my understanding, any strong motivating choices for the gif decoder library choice (giflib)? I know there's quite a few out there. |
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Not really any strong reasons for it, we could even swap for a Rust based one if you prefer. From a basic research good candidates are:
I will create an alternative PR with the Rust one instead. |
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Closed in favor of #104 |
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This PR adds a gif package with decode support.
The idea is to eventually be able to offer GIF -> Animated WEBP / Animated AVIF using jSquash packages