C语言bmp图像压缩算法

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

// 定义图像头部结构体
typedef struct {
    unsigned short type;
    unsigned int size;
    unsigned short reserved1;
    unsigned short reserved2;
    unsigned int offset;
} BMPHeader;

// 定义像素点结构体
typedef struct {
    unsigned char b;
    unsigned char g;
    unsigned char r;
} Pixel;

int compressBMP(const char* inputFile, const char* outputFile) {
    FILE* input = fopen(inputFile, "rb");
    FILE* output = fopen(outputFile, "wb");

    if (input == NULL || output == NULL) {
        printf("无法打开文件\n");
        return -1;
    }

    // 读取 bmp 文件头部信息
    BMPHeader header;
    fread(&header, sizeof(BMPHeader), 1, input);
    fwrite(&header, sizeof(BMPHeader), 1, output);

    // 读取图像的宽度和高度
    int width = header.width;
    int height = header.height;

    // 计算图像每行的字节数
    int rowSize = ((width * 3 + 3) / 4) * 4;

    // 分配内存存储图像像素数据
    Pixel** image = malloc(height * sizeof(Pixel*));
    for (int i = 0; i < height; i++) {
        image[i] = malloc(rowSize);
        fread(image[i], sizeof(Pixel), rowSize, input);
    }

    // 进行压缩处理
    // TODO: 压缩处理的代码

    // 将压缩后的数据写入到新的 bmp 文件中
    for (int i = 0; i < height; i++) {
        fwrite(image[i], sizeof(Pixel), rowSize, output);
        free(image[i]);
    }
    free(image);

    fclose(input);
    fclose(output);

    return 0;
}

int main() {
    const char* inputFile = "input.bmp";
    const char* outputFile = "output.bmp";

    int result = compressBMP(inputFile, outputFile);

    if (result == 0) {
        printf("压缩成功\n");
    } else {
        printf("压缩失败\n");
    }

    return 0;
}