Peter Nelson 2cd9716b38 LibGfx: Add a sniff method to ImageDecoder and implement for GIF and PNG ...

The sniff method is intended to be used for content sniffing. It should be a
cheap test to rapidly rule out whether a candidate image can be successfully
decoded. For the GIF and PNG implementations it simply attempts to decode the
image header, returning true if successful and false if not.

2020-04-25 16:49:09 +02:00

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