读取bmp图片并对其进行反转，保存的c++代码

以下是读取bmp图片并进行反转的C代码：

#include <stdio.h>
#include <stdlib.h>

typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned int DWORD;
typedef int LONG;

#pragma pack(push, 1)

// 声明 BMP 文件的头部信息结构体
typedef struct {
    WORD bfType;
    DWORD bfSize;
    WORD bfReserved1;
    WORD bfReserved2;
    DWORD bfOffBits;
} BMPFILEHEADER;

// 声明 BMP 图像的信息结构体
typedef struct {
    DWORD biSize;
    LONG biWidth;
    LONG biHeight;
    WORD biPlanes;
    WORD biBitCount;
    DWORD biCompression;
    DWORD biSizeImage;
    LONG biXPelsPerMeter;
    LONG biYPelsPerMeter;
    DWORD biClrUsed;
    DWORD biClrImportant;
} BMPINFOHEADER;

#pragma pack(pop)

// 定义文件头类型和信息头类型
BMPFILEHEADER bmpFileHeader;
BMPINFOHEADER bmpInfoHeader;

void invertImage(BYTE* imageData, int width, int height);

int main() {
    // 打开 BMP 图像文件
    FILE* fp = fopen("test.bmp", "rb");
    if (fp == NULL) {
        printf("Failed to open file.\n");
        return -1;
    }

    // 读取 BMP 文件头
    fread(&bmpFileHeader, sizeof(BMPFILEHEADER), 1, fp);

    // 判断 BMP 文件是否正确
    if (bmpFileHeader.bfType != 0x4D42) {
        printf("Not a BMP file.\n");
        fclose(fp);
        return -1;
    }

    // 读取 BMP 信息头
    fread(&bmpInfoHeader, sizeof(BMPINFOHEADER), 1, fp);

    // 读取 BMP 图像数据
    int imageSize = bmpInfoHeader.biSizeImage;
    int width = bmpInfoHeader.biWidth;
    int height = bmpInfoHeader.biHeight;

    // 像素数据大小如果为 0，计算一下
    if (imageSize == 0) {
        imageSize = width * height * 3;
    }

    BYTE* imageData = (BYTE*) malloc(imageSize);

    fseek(fp, bmpFileHeader.bfOffBits, SEEK_SET);
    fread(imageData, imageSize, 1, fp);

    fclose(fp);

    // 对 BMP 图像数据进行反转
    invertImage(imageData, width, height);

    // 写入反转后的 BMP 图像数据
    fp = fopen("inverted.bmp", "wb");
    if (fp == NULL) {
        printf("Failed to create file.\n");
        return -1;
    }

    fwrite(&bmpFileHeader, sizeof(BMPFILEHEADER), 1, fp);
    fwrite(&bmpInfoHeader, sizeof(BMPINFOHEADER), 1, fp);
    fwrite(imageData, imageSize, 1, fp);

    fclose(fp);
    free(imageData);

    return 0;
}

void invertImage(BYTE* imageData, int width, int height) {
    int lineSize = width * 3;
    BYTE* lineBuffer = (BYTE*) malloc(lineSize);
    for (int y = 0; y < height / 2; y++) {
        int i1 = y * lineSize;
        int i2 = (height - y - 1) * lineSize;
        memcpy(lineBuffer, imageData + i1, lineSize);
        memcpy(imageData + i1, imageData + i2, lineSize);
        memcpy(imageData + i2, lineBuffer, lineSize);
    }
    free(lineBuffer);
}

注意：该代码只适用于 **24位** 位图。对于其他格式的位图，需要根据其特点作出相应修改。