//
// EFP_Checks.C
//
// $Id: EFP_Checks.C,v 1.4 1998/10/14 21:25:57 mmp Exp $
//


#include "EF.h"

// pluginInit() must have C linkage for the effects system to find it.
extern "C" {
    void pluginInit(EF_PluginOptions *opt);
}

static void doChecks(EF_Image *image, EF_Image *outimage, float v)
{
    int x,y;
    v=v+.01;

    for (y=0;y<image->ySize;y++) {
	for (x=0;x<image->xSize;x++) {
	    int val= (int)((x/(int)(v*100))+(y/(int)(v*100)))%2;
	
	    RED(EF_ImageXY(outimage,x,y))=val*50;
	    GREEN(EF_ImageXY(outimage,x,y))=val*50;
	    BLUE(EF_ImageXY(outimage,x,y))=val*200;
	    ALPHA(EF_ImageXY(outimage,x,y))=val*255;
	} 
    }
}

void pluginInit(EF_PluginOptions *options)
{
    options->applyOne=doChecks;
    strcpy(options->name,"Checks");
}