JS1k: The JavaScript code golfing competition

var e="Love.,Liebe.,Amor.,Cinta.,Pagibig.,\u611b\u3002".split(","),h=[],i,j,k,l=0,m,n;c.width=700;c.height=448;b.style.backgroundColor="#000";a.font="200px Georgia";a.textBaseline="middle";a.textAlign="center";for(var o=0;o<e.length;o++)a.fillStyle="#fff",a.fillText(e[o],c.width/2,c.height/2),h[o]=a.getImageData(0,0,c.width,c.height),a.clearRect(0,0,c.width,c.height);function s(t){return Math.floor(Math.random()*t)}n=Math.ceil(h[0].width/7);
(function u(){window.setTimeout(function(){0===l&&(m=s(e.length),i=s(256),j=s(256),k=s(256));for(var f=0;f<h[m].height;f+=7)for(var g=0;g<7*l;g+=7){var d;a:{d=m;for(var p=0;5>p;p++)for(var q=0;5>q;q++){var r=4*(f+p)*h[d].width+4*(g+q);if(0!==h[d].data[r]||0!==h[d].data[r+1]||0!==h[d].data[r+2]){d=1;break a}}d=0}a.fillStyle=1===d?"rgb("+(255-i)+","+(255-j)+","+(255-k)+")":"rgb("+i+","+j+","+k+")";a.fillRect(g,f,5,5)}l=(l+1)%n;u()},1)})();

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// full source at https://github.com/darklight721/JS1K/blob/master/src.js
// Declare variables
var	t = ["Love.","Liebe.","Amor.","Cinta.","Pagibig.","愛。"],// texts
	p = 5, 		// pixel size
	s = 2,		// spacing between pixels
	img = [],	// image data
	r,g,v,		// rgb colors
	i=0,h,m;	// incrementors

// Set canvas size
c.width = 700;
c.height = 448;

// Set background color
b.style.backgroundColor = "#000";

// Format font
a.font = "200px Georgia";
a.textBaseline = "middle";
a.textAlign = "center";

for (var j = 0; j < t.length; j++)
{
	// Draw text
	a.fillStyle = "#fff";
	a.fillText(t[j],c.width/2,c.height/2);

	// Save image data
	img[j] = a.getImageData(0,0,c.width,c.height);
	
	// Clear the canvas
	a.clearRect(0,0,c.width,c.height);
}

// Get a random value between 0 to n
var getRandomValue = function(n){
	return Math.floor(Math.random()*n);
};

// Pick a random rgb color
var randomColor = function(){
	r = getRandomValue(256);
	g = getRandomValue(256);
	v = getRandomValue(256);
};

// Tests whether a pixel contains a text
var isTextOnPixel = function(w,x,y) {
	for (var i = 0; i < p;i++)
	{
		for (var j = 0; j < p; j++)
		{
			var k = ((y+i)*img[w].width*4) + ((x+j)*4);
			if (img[w].data[k] !== 0 || img[w].data[k+1] !== 0 || img[w].data[k+2] !== 0)
			{
				return 1;
			}
		}
	}
	return 0;
};

m = Math.ceil(img[0].width/(p+s)); // max number of pixelated columns

// Start rendering
(function render(){

	window.setTimeout(function(){
	
		if (i === 0) // only pick a random color once the whole canvas is painted with the current color
		{
			h = getRandomValue(t.length); // get random index of texts
			randomColor();
		}
		
		for (var y = 0; y < img[h].height; y+=p+s)
		{
			for (var x = 0; x < i*(p+s); x+=p+s)
			{
				if (isTextOnPixel(h,x,y) === 1)
				{
					// if pixel contains text, get the opposite color
					a.fillStyle = "rgb("+(255-r)+","+(255-g)+","+(255-v)+")";
				}
				else
				{
					a.fillStyle = "rgb("+r+","+g+","+v+")";
				}
				// Draw rect here
				a.fillRect(x,y,p,p);
			}
		}
		
		i = (i+1) % m; // increment
		
		render();
	},1);
})();