From 46bea41e3754b9c1df0ac0da2b1faabd0c38871d Mon Sep 17 00:00:00 2001
From: yalishizhude <yalishizhude@163.com>
Date: Mon, 7 Dec 2015 21:51:50 +0800
Subject: [PATCH] =?UTF-8?q?=E5=8E=8B=E7=BC=A9=E7=89=88?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 src/megapix-image.min.js | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 src/megapix-image.min.js

diff --git a/src/megapix-image.min.js b/src/megapix-image.min.js
new file mode 100644
index 0000000..eafedf4
--- /dev/null
+++ b/src/megapix-image.min.js
@@ -0,0 +1 @@
+(function(){function detectSubsampling(img){var iw=img.naturalWidth,ih=img.naturalHeight;if(iw*ih>1024*1024){var canvas=document.createElement('canvas');canvas.width=canvas.height=1;var ctx=canvas.getContext('2d');ctx.drawImage(img,-iw+1,0);return ctx.getImageData(0,0,1,1).data[3]===0}else{return false}}function detectVerticalSquash(img,iw,ih){var canvas=document.createElement('canvas');canvas.width=1;canvas.height=ih;var ctx=canvas.getContext('2d');ctx.drawImage(img,0,0);var data=ctx.getImageData(0,0,1,ih).data;var sy=0;var ey=ih;var py=ih;while(py>sy){var alpha=data[(py-1)*4+3];if(alpha===0){ey=py}else{sy=py}py=(ey+sy)>>1}var ratio=(py/ih);return(ratio===0)?1:ratio}function renderImageToDataURL(img,options,doSquash){var canvas=document.createElement('canvas');renderImageToCanvas(img,canvas,options,doSquash);return canvas.toDataURL("image/jpeg",options.quality||0.8)}function renderImageToCanvas(img,canvas,options,doSquash){var iw=img.naturalWidth,ih=img.naturalHeight;if(!(iw+ih))return;var width=options.width,height=options.height;var ctx=canvas.getContext('2d');ctx.save();transformCoordinate(canvas,ctx,width,height,options.orientation);var subsampled=detectSubsampling(img);if(subsampled){iw/=2;ih/=2}var d=1024;var tmpCanvas=document.createElement('canvas');tmpCanvas.width=tmpCanvas.height=d;var tmpCtx=tmpCanvas.getContext('2d');var vertSquashRatio=doSquash?detectVerticalSquash(img,iw,ih):1;var dw=Math.ceil(d*width/iw);var dh=Math.ceil(d*height/ih/vertSquashRatio);var sy=0;var dy=0;while(sy<ih){var sx=0;var dx=0;while(sx<iw){tmpCtx.clearRect(0,0,d,d);tmpCtx.drawImage(img,-sx,-sy);ctx.drawImage(tmpCanvas,0,0,d,d,dx,dy,dw,dh);sx+=d;dx+=dw}sy+=d;dy+=dh}ctx.restore();tmpCanvas=tmpCtx=null}function transformCoordinate(canvas,ctx,width,height,orientation){switch(orientation){case 5:case 6:case 7:case 8:canvas.width=height;canvas.height=width;break;default:canvas.width=width;canvas.height=height}switch(orientation){case 2:ctx.translate(width,0);ctx.scale(-1,1);break;case 3:ctx.translate(width,height);ctx.rotate(Math.PI);break;case 4:ctx.translate(0,height);ctx.scale(1,-1);break;case 5:ctx.rotate(0.5*Math.PI);ctx.scale(1,-1);break;case 6:ctx.rotate(0.5*Math.PI);ctx.translate(0,-height);break;case 7:ctx.rotate(0.5*Math.PI);ctx.translate(width,-height);ctx.scale(-1,1);break;case 8:ctx.rotate(-0.5*Math.PI);ctx.translate(-width,0);break;default:break}}var URL=window.URL&&window.URL.createObjectURL?window.URL:window.webkitURL&&window.webkitURL.createObjectURL?window.webkitURL:null;function MegaPixImage(srcImage){if(window.Blob&&srcImage instanceof Blob){if(!URL){throw Error("No createObjectURL function found to create blob url");}var img=new Image();img.src=URL.createObjectURL(srcImage);this.blob=srcImage;srcImage=img}if(!srcImage.naturalWidth&&!srcImage.naturalHeight){var _this=this;srcImage.onload=srcImage.onerror=function(){var listeners=_this.imageLoadListeners;if(listeners){_this.imageLoadListeners=null;for(var i=0,len=listeners.length;i<len;i++){listeners[i]()}}};this.imageLoadListeners=[]}this.srcImage=srcImage}MegaPixImage.prototype.render=function(target,options,callback){if(this.imageLoadListeners){var _this=this;this.imageLoadListeners.push(function(){_this.render(target,options,callback)});return}options=options||{};var imgWidth=this.srcImage.naturalWidth,imgHeight=this.srcImage.naturalHeight,width=options.width,height=options.height,maxWidth=options.maxWidth,maxHeight=options.maxHeight,doSquash=!this.blob||this.blob.type==='image/jpeg';if(width&&!height){height=(imgHeight*width/imgWidth)<<0}else if(height&&!width){width=(imgWidth*height/imgHeight)<<0}else{width=imgWidth;height=imgHeight}if(maxWidth&&width>maxWidth){width=maxWidth;height=(imgHeight*width/imgWidth)<<0}if(maxHeight&&height>maxHeight){height=maxHeight;width=(imgWidth*height/imgHeight)<<0}var opt={width:width,height:height};for(var k in options)opt[k]=options[k];var tagName=target.tagName.toLowerCase();if(tagName==='img'){target.src=renderImageToDataURL(this.srcImage,opt,doSquash)}else if(tagName==='canvas'){renderImageToCanvas(this.srcImage,target,opt,doSquash)}if(typeof this.onrender==='function'){this.onrender(target)}if(callback){callback()}if(this.blob){this.blob=null;URL.revokeObjectURL(this.srcImage.src)}};if(typeof define==='function'&&define.amd){define([],function(){return MegaPixImage})}else{this.MegaPixImage=MegaPixImage}})();
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