b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
11 lines
No EOL
1.4 KiB
JavaScript
11 lines
No EOL
1.4 KiB
JavaScript
;'use strict';var WBMP=(function(document){function decode(arrayBuffer,callback){var bytes=new Uint8Array(arrayBuffer);var ptr=0;function readOctet(){return bytes[ptr++]&0xff;}
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function readMultiByteInteger(){var result=0;while(true){if(result&0xfe000000){throw'error parsing integer';}
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var b=bytes[ptr++];result=(result<<7)|(b&0x7f);if(!(b&0x80)){return result;}}}
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function write(data,w,bit){var color=bit?255:0;data[w]=color;data[w+1]=color;data[w+2]=color;data[w+3]=255;}
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try{if(readMultiByteInteger()!==0){return false;}
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if(readOctet()!==0){return false;}
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var width=readMultiByteInteger();var height=readMultiByteInteger();if(width===0||width>65535||height===0||height>65535){return false;}
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var canvas=document.createElement('canvas');canvas.setAttribute('width',width);canvas.setAttribute('height',height);var ctx=canvas.getContext('2d',{willReadFrequently:true});var imageData=ctx.createImageData(width,height);var data=imageData.data;for(var y=0;y<height;++y){for(var x=0;x<width;x+=8){var bits=bytes[ptr++];var w=(y*width+x)*4;write(data,w,bits&0x80);write(data,w+4,bits&0x40);write(data,w+8,bits&0x20);write(data,w+12,bits&0x10);write(data,w+16,bits&0x08);write(data,w+20,bits&0x04);write(data,w+24,bits&0x02);write(data,w+28,bits&0x01);}}
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if(ptr>bytes.length){return null;}
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ctx.putImageData(imageData,0,0);canvas.toBlob(callback);}catch(e){return null;}}
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return{decode:decode};})(document); |