| 12 |
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i={FalseFloydSteinberg:[[3/8,1,0],[3/8,0,1],[.25,1,1]],FloydSteinberg:[[7/16,1,0],[3/16,-1,1],[5/16,0,1],[1/16,1,1]],Stucki:[[8/42,1,0],[4/42,2,0],[2/42,-2,1],[4/42,-1,1],[8/42,0,1],[4/42,1,1],[2/42,2,1],[1/42,-2,2],[2/42,-1,2],[4/42,0,2],[2/42,1,2],[1/42,2,2]],Atkinson:[[1/8,1,0],[1/8,2,0],[1/8,-1,1],[1/8,0,1],[1/8,1,1],[1/8,0,2]]};if(!t||!i[t])throw"Unknown dithering kernel: "+t;var r=i[t],s=0,o=this.height,n=this.width,a=this.pixels,h=e?-1:1;this.indexedPixels=new Uint8Array(this.pixels.length/3);for(var l=0;l<o;l++){e&&(h*=-1);for(var u=1==h?0:n-1,p=1==h?n:0;u!==p;u+=h){s=l*n+u;var f=3*s,c=a[f],y=a[f+1],w=a[f+2];f=this.findClosestRGB(c,y,w),this.usedEntry[f]=!0,this.indexedPixels[s]=f,f*=3;for(var d=this.colorTab[f],g=this.colorTab[f+1],x=this.colorTab[f+2],b=c-d,v=y-g,P=w-x,B=1==h?0:r.length-1,m=1==h?r.length:0;B!==m;B+=h){var S=r[B][1],T=r[B][2];if(S+u>=0&&S+u<n&&T+l>=0&&T+l<o){var 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t=768-this.colorTab.length,e=0;e<t;e++)this.out.writeByte(0)},r.prototype.writeShort=function(t){this.out.writeByte(255&t),this.out.writeByte(t>>8&255)},r.prototype.writePixels=function(){new t(this.width,this.height,this.indexedPixels,this.colorDepth).encode(this.out)},r.prototype.stream=function(){return this.out}}()}]);
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