image: add extra test for monochrome images #7
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I wanted to fix the TODO (whether the decoded image was actually valid)
but found that it wasn't:
- The size wasn't correct. The TinyGo logo was actually 304x255 in
size, not 299x255 (it looks like it was created with a tool that
assumes every row starts at a byte aligned line, which image.Mono
doesn't).
- There seems to be a problem when the image is decoded as a
pixel.Monochrome, but I haven't yet figured out why.
This test needs tinygo-org/drivers#683 to pass, but I think it's a useful test regardless.
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This PR needs tinygo-org/drivers#683 to be merged first.