从C中的2D阵列读取镜像

Question

我正在用C编写一个程序，在该程序中，我正在用2D数组读取bmp图像。我应该将原始图像+其逆图像右相邻作为输出。

我这里的代码应该是这样做的，但图像打印在彼此的顶部上。如果有人知道我该怎么解决的话，我很感激你的帮助。

int main(void) {
    // Opens file to read the image from
    FILE * infile = fopen("inputImage.bmp", "rb");
    // Creates file to write the image to after modifications     
    FILE * outfile = fopen("flip.bmp", "wb");
    //Bmp images have headers the next 3 lines of code store the header of the input image
    unsigned char headersPart1[2];
    int filesize;    
    unsigned char headersPart2[48];
    // This space[] [] creates the array to which to write the input image AND its inverse right next to each other  the image file is 160 * 240
    // The 3 is for the rgb values.. since its a 2D array we want to use every single //part of the image to work with    
    unsigned char space[160][3*240]; 
    //The array to which to copy the results to (original image + INVERSE) 
    unsigned char mirror[160][3*480]; 
    fread(headersPart1,sizeof(char) ,2,infile);
    fread(&filesize,sizeof(char) ,4,infile);
    fread(headersPart2,sizeof(char) ,48,infile);  
    fread(space,sizeof(char) ,filesize-54,infile);  
    // copying what in the original image array (space[][]) into the new //array mirror[][]
    for ( int row = 0; row < 240*3 ; row++ ) {
        for (int col = 0 ; col < 160; col++) {
            char temp = space[col][row];
            mirror[col][row] = space[col][row];
            //Starts printing the inverse of the original image, starting at the index where the original image will end
            mirror[col][720+row]=  space[col][719-row];
            space[col][row] = temp;
        }
    }
    // Puts everything back into the outfile , once i save and run on GCC this gives me an image and its inverse on top of each other
    fwrite(headersPart1,sizeof(char) ,2,outfile);
    fwrite(&filesize,sizeof(char) ,4,outfile);
    fwrite(headersPart2,sizeof(char) ,48,outfile);
    //sends whats in mirror [][] to the outfile
    //54 is the size of the header (bmp images))
    fwrite(mirror,sizeof(char) ,filesize-54,outfile);    
    return 0;
}

PS：我在GCC 上运行这个

Answer 1

您可以在此处找到的BMP文件格式

您的加载程序在支持不同版本的BMP、检查分辨率、颜色深度、调色板等方面并不完整。

但对于你想使用它的目的，你可能有一个固定的输入，总是相同的分辨率等。

但是您希望生成的图像的宽度是原来的两倍。因此，标题中的一些细节必须更改：

"文件大小"
"位图宽度（以像素为单位）（带符号整数）"