LaTeX技巧012：LaTeX 插图加载宏包

LaTeX 插图加载宏包。支持 LaTeX - DVIPDFMx; pdfLaTeX; XeLaTeX 三种编译方式，支持 eps/pdf/jpg/png 等图片格式。

 % Put this snippet in your preamble.
 \usepackage{ifpdf, ifxetex}
 \ifxetex
   \usepackage{graphicx}
 \else
   \ifpdf
     \usepackage{graphicx}
     \usepackage{epstopdf}
   \else
     \usepackage[dvipdfm]{graphicx}
     \usepackage{bmpsize}
   \fi
 \fi