HEIC decoder#101
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New decode-only package using libheif + libde265 to decode HEIC/HEIF images (H.265/HEVC) to ImageData, following the same WASM + Emscripten pattern as the existing @jsquash/avif package. Includes: TypeScript wrapper, C++ Emscripten binding, Makefile build system, and environment polyfills. The WASM binary needs to be built via Docker (npm run build:codec) before publishing. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Fix libde265 URL to use official strukturag repo - Copy generated de265-version.h to source tree for FindLIBDE265 - Disable libheif test builds (BUILD_TESTING=OFF) - Fix typed_memory_view explicit val conversion for Emscripten 3.1.57 - Add compiled heic_dec.js and heic_dec.wasm Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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OH MY! Love your work @xfalcox. This is awesome. If it's ok, I'll take a look at these this weekend and get back to you with any comments 🙏 |
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Hey @jamsinclair, I have this PR waiting on this discourse/discourse#39014 which exemplifies well how to use the new capabilities. Have you had any chance to look at this? |
Author
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Hey @jamsinclair, sorry to ping again, wondering if you had the time to take a look. |
xfalcox
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May 7, 2026
xfalcox
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May 11, 2026
## Summary - Extends client-side image optimization to convert **JXL → JPEG**, **HEIC → JPEG**, and **animated GIF → animated WEBP** using jSquash WASM packages before upload - Transparent JXL/HEIC images are converted to **WEBP** instead of JPEG, so transparency is preserved (WEBP compresses much better than PNG for this case) - Gated as an **upcoming change** via `composer_media_optimization_image_convert_enabled` (experimental, `feature,all_members`, opt-in per group through the upcoming changes admin UI) - Sends raw file bytes to Web Worker for formats browsers can't decode natively (JXL, HEIC), with new `"convert"` and `"convertAnimated"` worker message types - Adds JXL to `authorized_extensions` and `supported_images`; adds HEIC/HEIF to `supported_images` for consistency - Skips GIF→WEBP when output is larger than input - Falls back to filename when MIME type is missing (browsers may not recognize JXL/HEIC) ### Note on jSquash packages This depends on Discourse-scoped forks of the jSquash packages (`@discourse/jxl`, `@discourse/heic`, `@discourse/webp`, `@discourse/gif`, `@discourse/jpeg`, `@discourse/resize`). The following upstream PRs would let us move back to the canonical `@jsquash/*` packages, but the upstream maintainer is currently unresponsive: - jamsinclair/jSquash#101 (`@jsquash/heic`) - jamsinclair/jSquash#103 (`@jsquash/webp` animated support) - jamsinclair/jSquash#104 (`@jsquash/gif`) --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Hey, we consume some of your packages on https://github.com/discourse/discourse and we are considering doing HEIC -> JPG conversion on the client going forward, which made me add support for this.
I tested this locally and it works well for all sample HEIC file I could find.