Dynamically generated favicon

favicon, html, html5-canvas, javascript

Solution

EDIT: Got it working with

var canvas = document.createElement('canvas');
    canvas.width = 16;canvas.height = 16;
    var ctx = canvas.getContext('2d');
    var img = new Image();
    img.src = '/favicon.ico';
    img.onload = function() {
        ctx.drawImage(img, 0, 0);
        ctx.fillStyle = "#F00";
        ctx.fillRect(10, 7, 6, 8);
        ctx.fillStyle = '#FFFFFF';
        ctx.font = 'bold 10px sans-serif';
        ctx.fillText('2', 10, 14);

        var link = document.createElement('link');
        link.type = 'image/x-icon';
        link.rel = 'shortcut icon';
        link.href = canvas.toDataURL("image/x-icon");
        document.getElementsByTagName('head')[0].appendChild(link);
    }

You can actually run chrome and paste this:

javascript: var canvas = document.createElement('canvas');canvas.width = 16;canvas.height = 16;var ctx = canvas.getContext('2d');var img = new Image();img.src = '/favicon.ico';img.onload = function() {ctx.drawImage(img, 0, 0);ctx.fillStyle = "#F00";ctx.fillRect(10, 7, 6, 8);ctx.fillStyle = '#FFFFFF';ctx.font = 'bold 10px sans-serif';ctx.fillText('2', 10, 14);var link = document.createElement('link');link.type = 'image/x-icon';link.rel = 'shortcut icon';link.href = canvas.toDataURL("image/x-icon");document.getElementsByTagName('head')[0].appendChild(link);}

into the browser and see it in action.

Problem

Would it be possible using only JavaScript and HTML to dynamically generate a favicon, using the current page's favicon as a background, and a random number in the foreground? For example, lets say the current favicon looks similar to this: ``` ====================== ====XXXXXXXXXXXXXX==== ====X================= ====X================= ====X=====XXXXXXXX==== ====X============X==== ====X============X==== ====XXXXXXXXXXXXXX==== ====================== ``` If possible, how would I get it to look something similar to this using only JavaScript and HTML: ``` ====================== ====XXXXXXXXXXXXXX==== ====X================= ====X================= ====X=====XXXXXXXX==== ====X=========--111--= ====X=========--1-1--= ====XXXXXXXXXX----1--= ==============--1111-= ``` map: `=` : white background `x` : Original Favicon image `-` : Red generated image with a number `1` : White text Ideas: - Canvas? - Data Uri's?

Original source

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