[PATCH v3 0/2] MR10835: gdiplus: Add support for CMYK to ARGB pixel format conversion.

[Yongjie Yao (＠yaoyongjie)]

Add conversion from PixelFormat32bppCMYK to PixelFormat32bppARGB in
convert_pixels(), using the standard subtractive color model formula
where RGB = (255 - CMY) * (255 - K) / 255.

--
  v3: gdiplus: Fix return code for pixel format convertion.
      gdiplus/tests: Add test for pixel format conversion.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10835