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Merge pull request #1348 from chrishunt/dynamically-png-me
Re-write dynamic favicon javascript
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Sam
commit
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3 changed files with 50 additions and 223 deletions
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@ -1,226 +1,53 @@
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/**
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* jQuery Favicon Notify
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*
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* Updates the favicon to notify the user of changes. In the original tests I
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* had an embedded font collection to allow any charachers - I decided that the
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* ~130Kb and added complexity was overkill. As such it now uses a manual glyph
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* set meaning that only numerical notifications are possible.
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*
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* Dual licensed under the MIT and GPL licenses:
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*
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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* @author David King
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* @copyright Copyright (c) 2011 +
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* @url oodavid.com
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*/
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* jQuery Favicon Notify
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*
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* Updates the favicon with a number to notify the user of changes.
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*
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* iconUrl: Url of favicon image or icon
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* count: Integer count to place above favicon
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*
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* $.faviconNotify(iconUrl, count)
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*/
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(function($){
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var canvas;
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var bg = '#000000';
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var fg = '#FFFFFF';
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var pos = 'br';
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$.faviconNotify = function(icon, num, myPos, myBg, myFg){
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// Default the positions
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myPos = myPos || pos;
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myFg = myFg || fg;
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myBg = myBg || bg;
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// Create a canvas if we need one
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canvas = canvas || $('<canvas />')[0];
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if(canvas.getContext){
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// Load the icon
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$('<img />').load(function(e){
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// Load the icon into the canvas
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canvas.height = canvas.width = 16;
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var ctx = canvas.getContext('2d');
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.drawImage(this, 0, 0);
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// We gots num?
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if(num !== undefined){
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num = parseFloat(num, 10);
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// Convert the num into a glyphs array
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var myGlyphs = [];
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if(num > 99){
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myGlyphs.push(glyphs['LOTS']);
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} else {
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num = num.toString().split('');
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$.each(num, function(k,v){
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myGlyphs.push(glyphs[v]);
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});
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}
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if(num>0) {
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// Merge the glyphs together
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var combined = [];
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var glyphHeight = myGlyphs[0].length;
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$.each(myGlyphs, function(k,v){
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for(y=0; y<glyphHeight; y++){
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// First pass?
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if(combined[y] === undefined) {
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combined[y] = v[y];
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} else {
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// Merge the glyph parts, careful of the boundaries
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var l = combined[y].length;
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if(combined[y][(l-1)] === ' '){
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combined[y] = combined[y].substring(0, (l-1)) + v[y];
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} else {
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combined[y] += v[y].substring(1);
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}
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}
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}
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});
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// Figure out our starting position
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var glyphWidth = combined[0].length;
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var x = (myPos.indexOf('l') !== -1) ? 0 : (16 - glyphWidth);
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var y = (myPos.indexOf('t') !== -1) ? 0 : (16 - glyphHeight);
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// Draw them pixels!
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for(dX=0; dX<glyphWidth; dX++){
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for(dY=0; dY<glyphHeight; dY++){
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var pixel = combined[dY][dX];
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if(pixel !== ' '){
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ctx.fillStyle = (pixel === '@') ? myFg : myBg;
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ctx.fillRect((x+dX), (y+dY), 1, 1);
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}
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}
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}
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}
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}
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// Update the favicon
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$('link[rel$=icon]').remove();
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$('head').append($('<link rel="shortcut icon" type="image/x-icon"/>').attr('href', canvas.toDataURL('image/png')));
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}).attr('src', icon)
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}
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};
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var glyphs = {
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'0': [
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' --- ',
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' -@@@- ',
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'-@---@-',
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'-@- -@-',
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'-@- -@-',
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'-@- -@-',
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'-@---@-',
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' -@@@- ',
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' --- ' ],
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'1': [
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' - ',
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' -@- ',
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'-@@- ',
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' -@- ',
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' -@- ',
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' -@- ',
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' -@- ',
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'-@@@-',
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' --- ' ],
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'2': [
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' --- ',
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' -@@@- ',
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'-@---@-',
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' - --@-',
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' -@@- ',
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' -@-- ',
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'-@---- ',
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'-@@@@@-',
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' ----- ' ],
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'3': [
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' --- ',
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' -@@@- ',
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'-@---@-',
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' - --@-',
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' -@@- ',
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' - --@-',
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'-@---@-',
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' -@@@- ',
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' --- ' ],
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'4': [
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' -- ',
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' -@@-',
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' -@-@-',
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' -@--@-',
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'-@---@-',
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'-@@@@@-',
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' ----@-',
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' -@-',
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' - ' ],
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'5': [
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' ----- ',
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'-@@@@@-',
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'-@---- ',
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'-@--- ',
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'-@@@@- ',
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' ----@-',
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'-@---@-',
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' -@@@- ',
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' --- ' ],
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'6': [
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' --- ',
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' -@@@- ',
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'-@---@-',
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'-@---- ',
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'-@@@@- ',
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'-@---@-',
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'-@---@-',
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' -@@@- ',
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' --- ' ],
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'7': [
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' ----- ',
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'-@@@@@-',
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' ----@-',
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' -@- ',
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' -@- ',
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' -@- ',
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' -@- ',
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' -@- ',
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' - ' ],
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'8': [
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' --- ',
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' -@@@- ',
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'-@---@-',
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'-@---@-',
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' -@@@- ',
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'-@---@-',
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'-@---@-',
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' -@@@- ',
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' --- ' ],
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'9': [
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' --- ',
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' -@@@- ',
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'-@---@-',
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'-@---@-',
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' -@@@@-',
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' ----@-',
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'-@---@-',
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' -@@@- ',
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' --- ' ],
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'!': [
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' - ',
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'-@-',
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'-@-',
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'-@-',
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'-@-',
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'-@-',
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' - ',
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'-@-',
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' - ' ],
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'.': [
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' ',
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' ',
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' ',
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' ',
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' ',
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' ',
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' - ',
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'-@-',
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' - ' ],
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'LOTS': [
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' - -- --- -- ',
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'-@- -@@-@@@--@@-',
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'-@--@--@-@--@- ',
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'-@--@--@-@--@- ',
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'-@--@--@-@- -@- ',
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'-@--@--@-@- -@-',
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'-@--@--@-@----@-',
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'-@@@-@@--@-@@@- ',
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' --- -- - --- '
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]
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};
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$.faviconNotify = function(iconUrl, count){
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var canvas = canvas || $('<canvas />')[0],
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img = $('<img />')[0],
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multiplier, fontSize, context, xOffset, yOffset;
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if (canvas.getContext) {
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if (count < 1) { count = '' }
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else if (count < 10) { count = ' ' + count }
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else if (count > 99) { count = '99' }
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img.onload = function () {
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canvas.height = canvas.width = this.width;
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multiplier = (this.width / 16);
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fontSize = multiplier * 11;
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xOffset = multiplier;
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yOffset = multiplier * 11;
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context = canvas.getContext('2d');
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context.drawImage(this, 0, 0);
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context.font = 'bold ' + fontSize + 'px "helvetica", sans-serif';
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context.fillStyle = '#FFF';
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context.fillText(count, xOffset, yOffset);
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context.fillText(count, xOffset + 2, yOffset);
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context.fillText(count, xOffset, yOffset + 2);
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context.fillText(count, xOffset + 2, yOffset + 2);
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context.fillStyle = '#000';
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context.fillText(count, xOffset + 1, yOffset + 1);
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$('link[rel$=icon]').remove();
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$('head').append(
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$('<link rel="shortcut icon" type="image/x-icon"/>').attr(
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'href', canvas.toDataURL('image/png')
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)
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);
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};
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img.src = iconUrl;
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}
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};
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})(jQuery);
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