var Canvas2Image=(function(){var oCanvas=document.createElement("canvas"),sc=String.fromCharCode,strDownloadMime="image/octet-stream",bReplaceDownloadMime=false;if(!oCanvas.getContext){return{saveAsBMP:function(){},saveAsPNG:function(){},saveAsJPEG:function(){}}}
var bHasImageData=!!(oCanvas.getContext("2d").getImageData),bHasDataURL=!!(oCanvas.toDataURL),bHasBase64=!!(window.btoa);var readCanvasData=function(oCanvas){var iWidth=parseInt(oCanvas.width),iHeight=parseInt(oCanvas.height);return oCanvas.getContext("2d").getImageData(0,0,iWidth,iHeight);}
var encodeData=function(data){var i,aData,strData="";if(typeof data=="string"){strData=data;}else{aData=data;for(i=0;i<aData.length;i++){strData+=sc(aData[i]);}}
return btoa(strData);}
var createBMP=function(oData){var strHeader='',iWidth=oData.width,iHeight=oData.height;strHeader+='BM';var iFileSize=iWidth*iHeight*4+54;strHeader+=sc(iFileSize%256);iFileSize=Math.floor(iFileSize/256);strHeader+=sc(iFileSize%256);iFileSize=Math.floor(iFileSize/256);strHeader+=sc(iFileSize%256);iFileSize=Math.floor(iFileSize/256);strHeader+=sc(iFileSize%256);strHeader+=sc(0,0,0,0,54,0,0,0);strHeader+=sc(40,0,0,0);var iImageWidth=iWidth;strHeader+=sc(iImageWidth%256);iImageWidth=Math.floor(iImageWidth/256);strHeader+=sc(iImageWidth%256);iImageWidth=Math.floor(iImageWidth/256);strHeader+=sc(iImageWidth%256);iImageWidth=Math.floor(iImageWidth/256);strHeader+=sc(iImageWidth%256);var iImageHeight=iHeight;strHeader+=sc(iImageHeight%256);iImageHeight=Math.floor(iImageHeight/256);strHeader+=sc(iImageHeight%256);iImageHeight=Math.floor(iImageHeight/256);strHeader+=sc(iImageHeight%256);iImageHeight=Math.floor(iImageHeight/256);strHeader+=sc(iImageHeight%256);strHeader+=sc(1,0,32,0);strHeader+=sc(0,0,0,0);var iDataSize=iWidth*iHeight*4;strHeader+=sc(iDataSize%256);iDataSize=Math.floor(iDataSize/256);strHeader+=sc(iDataSize%256);iDataSize=Math.floor(iDataSize/256);strHeader+=sc(iDataSize%256);iDataSize=Math.floor(iDataSize/256);strHeader+=sc(iDataSize%256);strHeader+=sc(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);var aImgData=oData.data,strPixelData="",c,x,y=iHeight,iOffsetX,iOffsetY,strPixelRow;do{iOffsetY=iWidth*(y-1)*4;strPixelRow="";for(x=0;x<iWidth;x++){iOffsetX=4*x;strPixelRow+=sc(aImgData[iOffsetY+iOffsetX+2],aImgData[iOffsetY+iOffsetX+1],aImgData[iOffsetY+iOffsetX],aImgData[iOffsetY+iOffsetX+3]);}
strPixelData+=strPixelRow;}while(--y);return encodeData(strHeader+strPixelData);}
var saveFile=function(strData){if(!window.open(strData)){document.location.href=strData;}}
var makeDataURI=function(strData,strMime){return"data:"+strMime+";base64,"+strData;}
var makeImageObject=function(strSource){var oImgElement=document.createElement("img");oImgElement.src=strSource;return oImgElement;}
var scaleCanvas=function(oCanvas,iWidth,iHeight){if(iWidth&&iHeight){var oSaveCanvas=document.createElement("canvas");oSaveCanvas.width=iWidth;oSaveCanvas.height=iHeight;oSaveCanvas.style.width=iWidth+"px";oSaveCanvas.style.height=iHeight+"px";var oSaveCtx=oSaveCanvas.getContext("2d");oSaveCtx.drawImage(oCanvas,0,0,oCanvas.width,oCanvas.height,0,0,iWidth,iWidth);return oSaveCanvas;}
return oCanvas;}
return{saveAsPNG:function(oCanvas,bReturnImg,iWidth,iHeight){if(!bHasDataURL)return false;var oScaledCanvas=scaleCanvas(oCanvas,iWidth,iHeight),strMime="image/png",strData=oScaledCanvas.toDataURL(strMime);if(bReturnImg){return makeImageObject(strData);}else{saveFile(bReplaceDownloadMime?strData.replace(strMime,strDownloadMime):strData);}
return true;},saveAsJPEG:function(oCanvas,bReturnImg,iWidth,iHeight){if(!bHasDataURL)return false;var oScaledCanvas=scaleCanvas(oCanvas,iWidth,iHeight),strMime="image/jpeg",strData=oScaledCanvas.toDataURL(strMime);if(strData.indexOf(strMime)!=5)return false;if(bReturnImg){return makeImageObject(strData);}else{saveFile(bReplaceDownloadMime?strData.replace(strMime,strDownloadMime):strData);}
return true;},saveAsBMP:function(oCanvas,bReturnImg,iWidth,iHeight){if(!(bHasDataURL&&bHasImageData&&bHasBase64))return false;var oScaledCanvas=scaleCanvas(oCanvas,iWidth,iHeight),strMime="image/bmp",oData=readCanvasData(oScaledCanvas),strImgData=createBMP(oData);if(bReturnImg){return makeImageObject(makeDataURI(strImgData,strMime));}else{saveFile(makeDataURI(strImgData,strMime));}
return true;}};})();