Contact emailsdalecur...@chromium.org ExplainerNone
Specificationhttps://github.com/w3c/webcodecs/issues/508 Summary premultiplyAlpha tells ImageDecoder to multiply the alpha channel into the RGB channels of decoded images. It was added to mirror the capabilities of ImageBitmapOptions, but in retrospect doesn't make sense. Feature has no observable effects in primary use cases (drawing), but may constrain implementations in suboptimal ways. E.g., requiring YUV be converted to RGB. See https://github.com/w3c/webcodecs/issues/508 for a more detailed description. Per consensus of WebCodecs spec editors and lack of usage (0.000000339% - 0.00000687% of page loads per a UseCounter in M105), we propose deprecating and removing this feature starting with M108. Blink componentBlink>Media>WebCodecs <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EMedia%3EWebCodecs> TAG reviewNot applicable TAG review statusNot applicable Risks It's possible that there exists some client which was accessing raw pixel data in JavaScript may observe that the alpha channel is no longer premultiplied into RGB channels. Clients wishing for this functionality can either do the multiply themselves or use createImageBitmap() to do this. Interoperability and Compatibility *Gecko*: Positive Firefox co-editor supports removal. *WebKit*: No signal *Web developers*: No signals *Other signals*: Microsoft co-editor supports removal. WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? No. Debuggability n/a Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?Yes Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> ?Yes Flag namen/a Requires code in //chrome?False Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1340190 Launch bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1340190 Estimated milestones M108 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way). https://github.com/w3c/webcodecs/pull/562 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/4560781148946432 This intent message was generated by Chrome Platform Status <https://chromestatus.com/>. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPUDrwc%3D7%2B2KC73kKTUdWUmvQNubFtZGphhh8DXgQXnr%2BJc_LQ%40mail.gmail.com.
