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Add support for APNG (Animated PNG) #37247

@ndac-todoroki

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@ndac-todoroki

Use case

I want to create a animation picture viewer, and many of the contents are APNG.
APNG is a standard and most of the modern browsers (Firefox, Chrome, Safari and iOS supports it), has good binary size compression compared to GIF, is more colourful, and artists love PNG!

Proposal

It would be great if the Image widget supports APNG out of the box. Currently it supports PNG, so the first frame of the file will be shown (APNG has backward compatibility for PNG).

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P3Issues that are less important to the Flutter projectc: new featureNothing broken; request for a new capabilitycustomer: crowdAffects or could affect many people, though not necessarily a specific customer.customer: fuchsiaengineflutter/engine related. See also e: labels.frameworkflutter/packages/flutter repository. See also f: labels.

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