munge.c

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/*
=================
=
= VL_MungePic
=
=================
*/

void VL_MungePic (unsigned char far *source, unsigned width, unsigned height)
{
	unsigned	x,y,plane,size,pwidth;
	unsigned char	far *temp, far *dest, far *srcline;

	size = width*height;

	if (width&3)
		errout ("VL_MungePic: Not divisable by 4!\n");

//
// copy the pic to a temp buffer
//
	temp = (unsigned char far *)farmalloc (size);
	if (!temp)
		errout ("Non enough memory for munge buffer!\n");

	_fmemcpy (temp,source,size);

//
// munge it back into the original buffer
//
	dest = source;
	pwidth = width/4;

	for (plane=0;plane<4;plane++)
	{
		srcline = temp;
		for (y=0;y<height;y++)
		{
			for (x=0;x<pwidth;x++)
				*dest++ = *(srcline+x*4+plane);
			srcline+=width;
		}
	}

	free (temp);
}