Nico Weber bdba70b38f LibGfx/WebP: Change ImageData optional-ness ...

Instead of ImageData having an Optional<Chunk> for the image data,
have it have a Chunk, and give the context an Optional<ImageData>.

This allows sharing a single code path for checking that either the
main image or an animation frame has a main image data chunk, and
that an alpha chunk is only present with a lossy main image data
chunk.

No behavior change.

2023-05-09 06:35:56 +02:00

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