winex11.drv[2/2]: Support GdiAlphaBlend with blendfn.AlphaFormat == 0 (fixes bug #9262)

[Alexandre Julliard]

"Mikolaj Zalewski" <mikolajz at google.com> writes:

> @@ -1600,6 +1603,16 @@ #endif
>      for(; y >= y2; y--) {
>          memcpy(dstbits, (char *)dib.dsBm.bmBits + y * dib.dsBm.bmWidthBytes + xSrc * 4,
>                 widthSrc * 4);
> +        if (!(blendfn.AlphaFormat & AC_SRC_ALPHA))
> +        {
> +            int i;
> +            RGBQUAD *quad = (RGBQUAD *)dstbits;
> +            for (i = 0; i < widthSrc; i++)
> +            {
> +                quad->rgbReserved = blendfn.SourceConstantAlpha;
> +                quad++;
> +            }
> +        }

It would be nicer to have a separate loop for that case, and do
everything in one go instead of patching up the values after the
copy. Also RGBQUAD is meant for color tables, it's not an appropriate
type for the bitmap data itself.

-- 
Alexandre Julliard
julliard at winehq.org