How to set JxlPixelFormat to BGR? about libjxl HOT 3 OPEN

BGR is not currently supported, just RGB, however, you can request RGBA and use _rotl to transform it into ARGB and then use _byteswap_ulong to transform it into BGRA, after casting the buffer from uint8_t * to unsigned long *. It should be fairly fast, even if it's mostly a short-term thing.

from libjxl.

You can find _rotl in <stdlib.h> in MS Visual C: https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/rotl-rotl64-rotr-rotr64?view=msvc-170

from libjxl.

Thanks for the reply. How can I call the "_rotl" function for a normal user who only calls jxl.dll?

It's too difficult to compile jxl in Window system, I tried twice (several hours each time) and failed in the end.
I would really like to be able to provide a compiler program that can drag and drop the source code package onto this program and generate a jxl.dll.

from libjxl.