YEP_Itmecore。里面有一段关于在道具界面显示道具详情时，绘制一个超大的图标的代码，可惜我也没有解析成功，贴给你看看，希望能够帮助你。

1. Window_ItemStatus.prototype.drawLargeIcon = function() {
   
2.     var iconIndex = this._item.iconIndex;
   
3.     var bitmap = ImageManager.loadSystem('IconSet');
   
4.     var pw = Window_Base._iconWidth;
   
5.     var ph = Window_Base._iconHeight;
   
6.     var sx = iconIndex % 16 * pw;
   
7.     var sy = Math.floor(iconIndex / 16) * ph;
   
8.     var dw = Yanfly.Param.ItemIconSize;
   
9.     var dh = Yanfly.Param.ItemIconSize;
   
10.     var dx = (Window_Base._faceWidth - dw) / 2;
    
11.     var dy = (Window_Base._faceHeight - dh) / 2;
    
12.     this.contents._context.imageSmoothingEnabled = false;
    
13.     this.contents.blt(bitmap, sx, sy, pw, ph, dx, dy, dw, dh);
    
14.     this.contents._context.imageSmoothingEnabled = true;
    
15. };
    

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