镜象变换的源代码

镜象变换的源代码如下，因为和平移的那段程序很类似，程序中的注释就简单一些。

/**
* 程序名: Mirror.cpp
* 功  能: 实现灰度图像的水平镜像和垂直镜像
*         测试图片test.bmp放在工程目录下
*/
#include <iostream>
#include <windows.h>
#include <fstream>
#include <cstring>
using namespace std;
BITMAPFILEHEADER bmpFileHeader; //bmp文件头
BITMAPINFOHEADER bmpInfoHeader; //bmp信息头
RGBQUAD *pColorTable;       //bmp颜色表
unsigned char *pBmpData;    //bmp位图数据
unsigned char *pXBmpData;  //水平镜像bmp位图数据
unsigned char *pYBmpData;  //垂直镜像bmp位图数据
/**
* 函数名: readBmp
* 参  数: fileName -- 指向文件名的指针
* 功  能: 读取将要处理的图片的信息，成功返回TRUE
*/
bool readBmp(char *fileName)
{
    FILE *fp = fopen(fileName,"rb");  //以二进制读方式打开
    if (NULL == fp)
    {
        cout<<"open failure!"<<endl;
        return FALSE;
    }
    //获得图片数据
    fread(&bmpFileHeader,sizeof(BITMAPFILEHEADER),1,fp);
    fread(&bmpInfoHeader,sizeof(BITMAPINFOHEADER),1,fp);
    pColorTable = new RGBQUAD[256];
    fread(pColorTable,sizeof(RGBQUAD),256,fp);
    int imgSize = bmpInfoHeader.biSizeImage;
    pBmpData = new unsigned char[imgSize];
    //因为大小没有改变，所以一起处理了
    pXBmpData = new unsigned char[imgSize];
    pYBmpData = new unsigned char[imgSize];
    fread(pBmpData,sizeof(unsigned char),imgSize,fp);
    fclose(fp); //关闭文件
    return TRUE;
}
/**
* 函数名: mirror
* 功  能: 对图片进行水平和垂直镜像操作
*/
void mirror()
{
    int height = bmpInfoHeader.biHeight;
    int width = bmpInfoHeader.biWidth;
    int imgSize = bmpInfoHeader.biSizeImage;
    memset(pXBmpData,0,sizeof(unsigned char )*imgSize);
    memset(pYBmpData,0,sizeof(unsigned char )*imgSize);
    int lineByte = (width * 8 + 31) / 32 * 4;  //每行像素的字节数
    for(int i = 0; i < height; i++ )
    {
        for(int j = 0; j < width; j++ )
        {
            *(pXBmpData + i*lineByte + width - 1 - j) = *(pBmpData + i*lineByte + j); //水平镜像
            *(pYBmpData + (height - i - 1)*lineByte + j) = *(pBmpData + i*lineByte + j);  //垂直镜像
        }
    }
}
/**
* 函数名: writeBmp
* 参  数: fileName -- 处理完之后的bmp图像
* 功  能: 写入文件数据到相应的文件中
*/
bool writeBmp(char *fileName,unsigned char *bmpData)
{
    FILE *fp = fopen(fileName,"wb"); //以二进制写方式打开
    if (NULL == fp)
    {
        cout<<"open failure!"<<endl;
        return FALSE;
    }
    int imgSize = bmpInfoHeader.biSizeImage;
    //写入数据
    fwrite(&bmpFileHeader,sizeof(BITMAPFILEHEADER),1,fp);
    fwrite(&bmpInfoHeader,sizeof(BITMAPINFOHEADER),1,fp);
    fwrite(pColorTable,sizeof(RGBQUAD),256,fp);
    fwrite(bmpData,sizeof(unsigned char),imgSize,fp);
    fclose(fp);  //关闭文件
    return TRUE;
}
/**
* 函数名: work
* 功  能: 主要处理
*/
void work()
{
    char readFileName[] = "test.bmp";
    if (!readBmp(readFileName))
    {
        cout<<"read failure!"<<endl;
        return ;
    }
    mirror();
    char writeFileNameX[] = "X.bmp";
    char writeFileNameY[] = "Y.bmp";
    if (!writeBmp(writeFileNameX,pXBmpData))
    {
        cout<<"X write failure!"<<endl;
        return ;
    }
    if (!writeBmp(writeFileNameY,pYBmpData))
    {
        cout<<"Y write failure!"<<endl;
        return ;
    }
    //释放
    delete []pColorTable;
    delete []pBmpData;
    delete []pXBmpData;
    delete []pYBmpData;
    cout<<"mirror success!"<<endl;

}
int main()
{
    work();
    return 0;
}