/********************************************************************
 *
 * PhotoGrok Script
 *
 * Example sharpening filter for viewed images.
 *
 *
 **********************************************************************/

// create a painter to sharpen image
var painter = function(gfx, image, ig, pp){

	// do not sharpen if image is being dragged or zoomed
	if(image != null && !pp.dragging && !pp.zooming){
		// only sharpen visible part of a magnified image
		var r = pp.getImageRect(image);
		gfx.drawImage(sharpen(image.getSubimage(r.x, r.y, r.width, r.height)), Math.max(pp.imageX, 0), Math.max(pp.imageY, 0), null);
	}
};

setPainter(painter);

var JAI = java.awt.image;

//this is Java 8 specific 
//var arr = Java.to([0,-.125,0,-.125,1.5,-.125,0,-.125,0], "float[]");

// create a Java float array - this syntax works in Java 6, 7 and 8
// 3x3 kernel array (values should add up to 1 for sharpening filter)
var arr = java.lang.reflect.Array.newInstance(java.lang.Float.TYPE, 9);
arr[0] = 0;
arr[1] = -.125;
arr[2] = 0;
arr[3] = -.125;
arr[4] = 1.5;
arr[5] = -.125;
arr[6] = 0;
arr[7] = -.125;
arr[8] = 0;


function sharpen(img){
	var simg = new JAI.BufferedImage(img.getWidth(), img.getHeight(), JAI.BufferedImage.TYPE_INT_RGB); 
	var g = simg.createGraphics();
	g.drawImage(img, 0, 0, null);
	g.dispose();

	var kernel = new JAI.Kernel(3,3,arr);

	var op = new java.awt.image.ConvolveOp(kernel, JAI.ConvolveOp.EDGE_NO_OP, null);
	return op.filter(simg, null);

}