Handle images with odd dimensions and fix color matrix, and add CI to check decoding functions

[ledyba-z]

Hi!

I found some bugs, and fixed:

• It will crash or display an inaccurate image when the decoder reads images with odd-width or odd-height.
• Conversion matrix is wrong (matrix->Cr_G and matrix->Cb_G are swapped).

And also, I added automated tests using github actions, because it is very boring and hard to check all cases by hand.

It checks that:

• the decoder won't crash when it reads all images in our sample images
• Output images are not so different from original (AVIF is lossy format, so the output image will not exactly match the original image).

Result page is here:
https://github.com/link-u/SDWebImageAVIFCoder/actions/runs/34667715

If travis-ci is more appropriate, I will port it.

Please take a look!

[dreampiggy]

Hi. Nice to see your contribution again.

I’ll have a check tomorrow, the CI integration is good (Previously, because of lack of unit test, I just use the Example samples).

A CLI for macOS is OK, we can also use the same test cases like SDWebImage or SDWebImageWebPCoder as well, which is much better for Xcode and can collect code coverage.

[dreampiggy]

The code change part LGTM +1.

The CI runner part, what else should I do to turn on GitHub Actions ? I previouslly only use the Travis-CI to build Unit Test.

[dreampiggy]

Let me just merge and have a try ?

[ledyba-z]

@dreampiggy

Thank you for your review! (and sorry for the late reply...)

we can also use the same test cases like SDWebImage or SDWebImageWebPCoder as well, which is much better for Xcode and can collect code coverage.

I agree. If you need, I will create some additional test images (which are more simple to write unit tests).

The CI runner part, what else should I do to turn on GitHub Actions ?

Just put yaml files to .github/workflows/****.yml.

Let me just merge and have a try ?

Of course! After this patch will be merged, Github Actions will be turned on.