[Webkit-unassigned] [Bug 210021] EXIF orientation info in PNGs isn't used for image-orientation: from-image
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Apr 6 14:31:51 PDT 2020
https://bugs.webkit.org/show_bug.cgi?id=210021
--- Comment #4 from Eric Portis <e at ericportis.com> ---
@smfr Interesting!
Here's a new test page: https://ericportis.com/etc/PNG-EXIF-orientation/shuffling-chunks/
Looks like (on MacOS 10.15):
Finder, Preview, and Safari respect eXIf-before-IDAT.
Chrome and Firefox do not respect eXIf-before-IDAT.
I'm not sure how any browser can support both eXIF-*after*-IDAT and also progressively render partially-downloaded, progressively-encoded PNGs. In some initial testing both Firefox and Chrome will paint partially-downloaded PNGs, but Safari does not.
Does a note about PNG chunk order and/or progressive rendering belong in the spec?
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