3 lines
1 KiB
JavaScript
3 lines
1 KiB
JavaScript
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(function(c){c.fn.noisy=function(b){b=c.extend({},c.fn.noisy.defaults,b);var d,a;if(JSON&&localStorage.getItem)a=localStorage.getItem(JSON.stringify(b));if(a)d=a;else{a=document.createElement("canvas");if(a.getContext){a.width=a.height=b.size;for(var h=a.getContext("2d"),e=h.createImageData(a.width,a.height),i=b.intensity*Math.pow(b.size,2),j=255*b.opacity;i--;){var f=(~~(Math.random()*a.width)+~~(Math.random()*a.height)*e.width)*4,g=i%255;e.data[f]=g;e.data[f+1]=b.monochrome?g:~~(Math.random()*255);
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e.data[f+2]=b.monochrome?g:~~(Math.random()*255);e.data[f+3]=~~(Math.random()*j)}h.putImageData(e,0,0);d=a.toDataURL("image/png");if(d.indexOf("data:image/png")!=0||c.browser.msie&&c.browser.version.substr(0,1)<9&&d.length>32768)d=b.fallback}else d=b.fallback;JSON&&localStorage&&localStorage.setItem(JSON.stringify(b),d)}return this.each(function(){c(this).css("background-image","url('"+d+"'),"+c(this).css("background-image"))})};c.fn.noisy.defaults={intensity:0.9,size:200,opacity:0.08,fallback:"",
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monochrome:false}})(jQuery);
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