mån 2024-01-29 klockan 19:37 -0500 skrev Leo Izen:
> libjxl doesn't support negative strides, but JPEG XL has an
> orientation
> flag inside the codestream. We can use this to work around the
> library
> limitation, by taking the absolute value of the negative row stride,
> sending the image up-side-down, and telling the library that the
> image
> has a vertical-flip orientation.
Coincidentally we were just talking about negative stride on IRC
yesterday.
> jxl_fmt.endianness = JXL_NATIVE_ENDIAN;
> - jxl_fmt.align = frame->linesize[0];
> + if (frame->linesize[0] >= 0) {
> + jxl_fmt.align = frame->linesize[0];
> + data = frame->data[0];
> + } else {
> + jxl_fmt.align = -frame->linesize[0];
> + data = frame->data[0] - jxl_fmt.align * (info.ysize - 1);
Looks correct
/Tomas
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