C语言将raw data(rgb/rgba)写成bmp文件(bmp24或32)

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本文介绍了一个用于创建BMP格式图片文件的C语言函数intbmp_write。该函数接收图像数据、尺寸及文件名作为参数，通过构建BMP文件头并写入图像数据来完成BMP文件的创建。

int bmp_write(unsigned char *image, int xsize, int ysize, char *filename)
{
    unsigned char header[54] = {
      0x42, 0x4d, 0, 0, 0, 0, 0, 0, 0, 0,
        54, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 32(或者24), 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0
    };

    long file_size = (long)xsize * (long)ysize * 4(或者3) + 54;
    header[2] = (unsigned char)(file_size &0x000000ff);
    header[3] = (file_size >> 8) & 0x000000ff;
    header[4] = (file_size >> 16) & 0x000000ff;
    header[5] = (file_size >> 24) & 0x000000ff;

    long width = xsize;
    header[18] = width & 0x000000ff;
    header[19] = (width >> 8) &0x000000ff;
    header[20] = (width >> 16) &0x000000ff;
    header[21] = (width >> 24) &0x000000ff;

    long height = ysize;
    header[22] = height &0x000000ff;
    header[23] = (height >> 8) &0x000000ff;
    header[24] = (height >> 16) &0x000000ff;
    header[25] = (height >> 24) &0x000000ff;

    char fname_bmp[128];
    sprintf(fname_bmp, "%s.bmp", filename);

    FILE *fp;
    if (!(fp = fopen(fname_bmp, "wb")))
      return -1;

    fwrite(header, sizeof(unsigned char), 54, fp);
    fwrite(image, sizeof(unsigned char), (size_t)(long)xsize * ysize * 4(或者3), fp);

    fclose(fp);
    return 0;
}