使用c中的位图文件结构进行位图图像文件操作

I want to implement a simple command line based image editor. The program will provide a text based menu, which provides several functions for user to manipulate a windows bitmap (.bmp) image file. The menu will include load image, rotate image, mirror image, save image and quit options. The load image option will be used to open and read pixel values from a given bitmap file. This option will also print out the basic properties, such as dimensions and total size, of the given file. The rotate and mirror options will manipulate previously read pixel values. An image must be loaded before applying these options. The save option will save the pixel values in the memory to a bitmap file with a given filename.

我想实现一个简单的基于命令行的图像编辑器。该程序将提供基于文本的菜单,该菜单为用户提供了若干功能来操作Windows位图(.bmp)图像文件。菜单将包括加载图像,旋转图像,镜像,保存图像和退出选项。加载图像选项将用于打开和读取给定位图文件中的像素值。此选项还将打印出给定文件的基本属性,例如尺寸和总大小。旋转和镜像选项将操纵先前读取的像素值。在应用这些选项之前必须加载图像。保存选项会将内存中的像素值保存到具有给定文件名的位图文件中。

Which approach do you recommend for me about this project and about bitmap file structure?

关于这个项目和位图文件结构,您对我推荐哪种方法?

It would be very appreciated if you give me advice even about one particular topic for example load the file.

如果您就某个特定主题提供建议,例如加载文件,我将非常感激。

3 个解决方案

#1

libbmp will make your program all but trivial to implement.

libbmp将使您的程序完全无关紧要。

#2

If you really want to use C then try the libbmp library http://code.google.com/p/libbmp/

如果你真的想使用C,那么试试libbmp库http://code.google.com/p/libbmp/

However, I'd recommend using C#, then the task would be trivial with the System.Drawing namespace.

但是,我建议使用C#,然后使用System.Drawing命名空间完成任务是微不足道的。

#3

This function is used for loading a bmp file to memory. you have to declare first a header file with bmp structure

此函数用于将bmp文件加载到内存。你必须首先声明一个bmp结构的头文件

BMP* load_BMP(char *filename);

BMP *bmp;       // local integer for file loaded
FILE *in;       // pointer for file opening
int rowsize;   

int row, col, color, i;
unsigned char b;

in=fopen(filename,"rb"); // open binary file
if (in==NULL)
{
    printf("Problem in opening file %s.\n",filename);
    return NULL;
}


bmp=(BMP*) malloc(sizeof(BMP)); //memory allocation
if (bmp==NULL)
{
    printf("Not enough memory to load the image.\n");
    return NULL;
}

fread(bmp->BM,2,1,in);
if (bmp->BM[0]!='B' || bmp->BM[1]!='M')
{
    printf("Bad BMP image file.\n");
    free(bmp);
    return NULL;
}

fread(&bmp->fileSize,4,1,in);
fread(&bmp->Reserved1,2,1,in);
fread(&bmp->Reserved2,2,1,in);
fread(&bmp->imageOffset,4,1,in);
fread(&bmp->imageHeaderSize,4,1,in);
fread(&bmp->imageWidth,4,1,in);

rowsize=4*((3*bmp->imageWidth+3)/4); //calculate rowsize because of padding

fread(&bmp->imageHeight,4,1,in);
fread(&bmp->colorPlanes,2,1,in);
fread(&bmp->compressionMethod,4,1,in);
fread(&bmp->imageSize,4,1,in);
fread(&bmp->hPPM,4,1,in);
fread(&bmp->vPPM,4,1,in);
fread(&bmp->paletteColors,4,1,in);
fread(&bmp->paletteImportantColors,4,1,in);


bmp->data=(unsigned char*) malloc(bmp->imageSize); //allocate memory for image data array
if (bmp->data==NULL)
{
    printf("There is not enough memory to load the image\n");
    free(bmp);
    return NULL;
}

for(row=0;row<bmp->imageHeight;row++)  //read picture data
{
    for(col=0;col<bmp->imageWidth;col++)
        for(color=0;color<=2;color++)
            fread(&bmp->data[row*rowsize+3*col+color],
            sizeof(unsigned char),1,in);

    //read extra bytes for end of row padding
    for(i=0;i<rowsize-3*bmp->imageWidth;i++)
        fread(&b,1,1,in);
}

fclose(in);
return bmp;

}

#1