GIF.min.js

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a},a.prototype.writeByte=function(a){this.bin.push(a)},a.prototype.writeUTFBytes=function(a){for(var b=a.length,c=0;b>c;c++)this.writeByte(a.charCodeAt(c))},a.prototype.writeBytes=function(a,b,c){for(var d=c||a.length,e=b||0;d>e;e++)this.writeByte(a[e])};var f,g,h,i,j,k,l,m,n,o={},p=null,q=-1,r=0,s=!1,t=[],u=7,v=-1,w=!1,x=!0,y=!1,z=10,A="Generated by jsgif (https://github.com/antimatter15/jsgif/)",B=(o.setDelay=function(a){r=Math.round(a/10)},o.setDispose=function(a){a>=0&&(v=a)},o.setRepeat=function(a){a>=0&&(q=a)},o.setTransparent=function(a){p=a},o.setComment=function(a){A=a},o.addFrame=function(a,b){if(null===a||!s||null===i)throw new Error("Please call start method before calling addFrame");var c=!0;try{b?j=a:(j=a.getImageData(0,0,a.canvas.width,a.canvas.height).data,y||C(a.canvas.width,a.canvas.height)),F(),D(),x&&(J(),L(),q>=0&&K()),G(),""!==A&&H(),I(),x||L(),N(),x=!1}catch(d){c=!1}return c},o.finish=function(){if(!s)return!1;var 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b=0;if(71!==a[b++]||73!==a[b++]||70!==a[b++]||56!==a[b++]||57!==a[b++]||97!==a[b++])throw"Invalid GIF 89a header.";var c=a[b++]|a[b++]<<8,d=a[b++]|a[b++]<<8,f=a[b++],g=f>>7,h=7&f,i=1<<h+1;a[b++];a[b++];var j=null;g&&(j=b,b+=3*i);var k=null,l=!0,m=[],n=0,o=null,p=0,k=null;for(this.width=c,this.height=d;l&&b<a.length;)switch(a[b++]){case 33:switch(a[b++]){case 255:if(11!==a[b]||78==a[b+1]&&69==a[b+2]&&84==a[b+3]&&83==a[b+4]&&67==a[b+5]&&65==a[b+6]&&80==a[b+7]&&69==a[b+8]&&50==a[b+9]&&46==a[b+10]&&48==a[b+11]&&3==a[b+12]&&1==a[b+13]&&0==a[b+16])b+=14,k=a[b++]|a[b++]<<8,b++;else for(b+=12;;){var q=a[b++];if(0===q)break;b+=q}break;case 249:if(4!==a[b++]||0!==a[b+4])throw"Invalid graphics extension block.";var r=a[b++];n=a[b++]|a[b++]<<8,o=a[b++],0===(1&r)&&(o=null),p=r>>2&7,b++;break;case 254:for(;;){var q=a[b++];if(0===q)break;b+=q}break;default:throw"Unknown graphic control label: 0x"+a[b-1].toString(16)}break;case 44:var s=a[b++]|a[b++]<<8,t=a[b++]|a[b++]<<8,u=a[b++]|a[b++]<<8,v=a[b++]|a[b++]<<8,w=a[b++],x=w>>7,y=w>>6&1,z=7&w,A=1<<z+1,B=j,C=!1;if(x){var C=!0;B=b,b+=3*A}var D=b;for(b++;;){var q=a[b++];if(0===q)break;b+=q}m.push({x:s,y:t,width:u,height:v,has_local_palette:C,palette_offset:B,data_offset:D,data_length:b-D,transparent_index:o,interlaced:!!y,delay:n,disposal:p});break;case 59:l=!1;break;default:throw"Unknown gif block: 0x"+a[b-1].toString(16)}this.numFrames=function(){return m.length},this.frameInfo=function(a){if(0>a||a>=m.length)throw"Frame index out of range.";return m[a]},this.decodeAndBlitFrameBGRA=function(b,d){var f=this.frameInfo(b),g=f.width*f.height,h=new Uint8Array(g);e(a,f.data_offset,h,g);var i=f.palette_offset,j=f.transparent_index;null===j&&(j=256);var k=f.width,l=c-k,m=k,n=4*(f.y*c+f.x),o=4*((f.y+f.height)*c+f.x),p=n,q=4*l;f.interlaced===!0&&(q+=4*(k+l)*7);for(var r=8,s=0,t=h.length;t>s;++s){var u=h[s];if(0===m&&(p+=q,m=k,p>=o&&(q=l+4*(k+l)*(r-1),p=n+(k+l)*(r<<1),r>>=1)),u===j)p+=4;else{var v=a[i+3*u],w=a[i+3*u+1],x=a[i+3*u+2];d[p++]=x,d[p++]=w,d[p++]=v,d[p++]=255}--m}},this.decodeAndBlitFrameRGBA=function(b,d){var f=this.frameInfo(b),g=f.width*f.height,h=new Uint8Array(g);e(a,f.data_offset,h,g);var i=f.palette_offset,j=f.transparent_index;null===j&&(j=256);var k=f.width,l=c-k,m=k,n=4*(f.y*c+f.x),o=4*((f.y+f.height)*c+f.x),p=n,q=4*l;f.interlaced===!0&&(q+=4*(k+l)*7);for(var r=8,s=0,t=h.length;t>s;++s){var u=h[s];if(0===m&&(p+=q,m=k,p>=o&&(q=l+4*(k+l)*(r-1),p=n+(k+l)*(r<<1),r>>=1)),u===j)p+=4;else{var v=a[i+3*u],w=a[i+3*u+1],x=a[i+3*u+2];d[p++]=v,d[p++]=w,d[p++]=x,d[p++]=255}--m}}}function e(a,b,c,d){for(var e=a[b++],f=1<<e,g=f+1,h=g+1,i=e+1,j=(1<<i)-1,k=0,l=0,m=0,n=a[b++],o=new Int32Array(4096),p=null;;){for(;16>k&&0!==n;)l|=a[b++]<<k,k+=8,1===n?n=a[b++]:--n;if(i>k)break;var q=l&j;if(l>>=i,k-=i,q!==f){if(q===g)break;for(var r=h>q?q:p,s=0,t=r;t>f;)t=o[t]>>8,++s;var 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