// noprotect

​

(function() {

​

    var width = 500;

    var height = 500;

    var size = width * height;

    var data = new Uint8Array(size * 3);

    var x_histogram;

    var y_histogram;

​

​

    var fill_data = function(data) {

        for(var i = 0; i < data.length; i++) {

            data[i] = parseInt(Math.random() * 255);

        }

        x_histogram = new Uint16Array(width);

        y_histogram = new Uint16Array(height);

    };

​

​

    var calc_histogram = function() {

        for(var x = 0; x < width; x++) {

            for(var y = 0; y < height; y++) {

                var i = (y * width + x) * 3;

                var r = data[i];

                var g = data[i + 1];

                var b = data[i + 2];

                var green = is_green(r, g, b);

                x_histogram[x] += green;

                y_histogram[y] += green;

            }

        }

    };

​

​

    var is_green = function(r, g, b) {

        return (g > 80) && (g > r + 35) && (g > b + 35);

    };

​

​

    var main = function() {

        for(var i = 0; i < 10; i++) {

            fill_data(data);

            var t1 = Date.now();

            calc_histogram(data, x_histogram, y_histogram);

            var t2 = Date.now();

            console.log('test ' + i + ': ' + (t2 - t1) + ' ms');

        }

    };

​

​

    main();

​

})();

​