float pcm_multiply(float src, float dest)
{
	return src * dest * inv255;
}
 
float pcm_divide(float src, float dest)
{
	return 255.0 * dest / (src + 1.0);
}
 
struct PixelCombineModes pcm[] = {
	{ PCM_BLEND, "Normal", NULL },
	{ PCM_MULTIPLY, "Multiply", pcm_multiply},
	{ PCM_DIVIDE, "Divide", pcm_divide},
	{ PCM_NUMMODES, NULL, NULL } 
};
 
UWORD FindPCFByName(struct PixelCombineModes *pcm, STRPTR name)
{
    UWORD result = NULL;
    int _index = 0;
    IDOS->Printf(" Finding %s\n",name);
    while((pcm[_index].pcm_Name != NULL))
    {
        if(!(strcmp(name,pcm[_index].pcm_Name)))
        {
            result = pcm[_index].pcm_PCF;
            break;
        }
        _index ++;
    }
    IDOS->Printf(" Setting function to %08lx\n",result);
    return result;
}
 
BOOL SetLayerPCFByName(struct SketchLayer *sklay, STRPTR name)
{
 
	if(name)
	{
		if((sklay->sl_PCF = FindPCFByName(pcm, name)))
		{
			return TRUE;
		}
	}
	return FALSE;
}