75 lines
1.7 KiB
JavaScript
75 lines
1.7 KiB
JavaScript
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// Code layout taken from http://www.mozbox.org/pub/green/main.js
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var processor = {
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doLoad: function() {
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this.video = document.getElementById("video");
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this.c1 = document.createElement("canvas");
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this.c1.width = "160"
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this.c1.height = "96"
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this.ctx1 = this.c1.getContext("2d");
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this.c2 = document.getElementById("c2");
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this.ctx2 = this.c2.getContext("2d");
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var self = this;
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this.video.addEventListener("play", function() {
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self.width = self.video.videoWidth / 2;
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self.height = self.video.videoHeight / 2;
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self.len = self.width * self.height;
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self.video.addEventListener('timeupdate', function(event) {
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self.computeFrame()
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}, true);
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}, false);
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},
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computeFrame: function() {
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var frame, data, i, offset, rgba, mod
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this.ctx1.drawImage(this.video, 0, 0, this.width, this.height);
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frame = this.ctx1.getImageData(0, 0, this.width, this.height);
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data = frame.data;
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ndata = []
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for (i = 0; i < this.len; i++) {
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ndata.push(0);
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ndata.push(0);
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ndata.push(0);
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ndata.push(255);
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}
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offset = Math.floor(Math.random()*10) + 5
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for (i = 0; i < this.len; i++) {
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rgba = data.getPixel(i);
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mod = i % this.width;
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ndata.setPixel(i, 1, rgba[1]);
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if (mod + offset < this.width)
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ndata.setPixel(i + offset, 0, rgba[0]);
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if (mod - offset > 0)
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ndata.setPixel(i - offset, 2, rgba[2]);
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}
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frame.data = ndata
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this.ctx2.putImageData(frame, 0, 0);
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return;
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}
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};
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Array.prototype.getPixel = function(number) {
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var real = number * 4;
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return this.slice(real, real + 4);
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};
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Array.prototype.setPixel = function(number, rgba, val) {
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var real = number * 4 + rgba;
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if (number < 0 || real > this.length)
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return;
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this[real] = val;
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};
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