位图处理....还在学习中

一、BMP图形文件的格式： （1）位图文件头,共14字节         前2字节：   BM        --- 任何BMP图象文件的开头         往下4字节： 32位数    --文件大小         再读2字节： 保留字         再读2字节： 保留字         再读4字节： 从文件头到位图实际数据的偏移字节数 以上为位图文件头,共14字节； Win32中用结构BITMAPFILEHEADER表示 （2）以下为位图信息,共40字节         读4字节： 指定这部分为40字节(?)         读4字节： 图象宽度         读4字节： 图象高度         读2字节： 必须是1(这里用来处理图象的宽)         读2字节： 位图的位数         读4字节： 位图是否压缩：BI_RGB（未压缩）,         读4字节： 实际位图数据占用字节数, 以上为位图信息,共40字节； Win32中用结构BITMAPEINFOHEADER表示 （3）接着是调色板：      调色板是一数组，共biClrUsed个元素，每个元素是一tagRGBQUAD结构为4字节(r,g,b,保留值)      注意：这一块的大小视各副图形图片不同而有所不同 （4）图象实际数据      对于用调色板的位图，图象数据是该象素的索引值，对于真彩色图，即(r,g,b)      注意：每行的字节数必须是4的倍数，如果不是，要补齐；对于bmp图，数据是从下到上            从左到右列的（即：从文件中最先读到的是图象最下面左边的第一象素） 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 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