//Farewell my DATA~
struct DATA
{BYTE blue;BYTE green;BYTE red;
};

//32位就分配size*4，24位就分配size*3
BYTE *imgdata=new BYTE[size * srcInfo.biBitCount / 8];

fread(imgdata + i * w * srcInfo.biBitCount / 8, srcInfo.biBitCount / 8, w, p);

for (int i=0; i<newH; i++){for (int j=0; j<newW; j++){*(target + (i * newW + j)*newInfo.biBitCount / 8) = *(src + (j * w + newH - i - 1)*newInfo.biBitCount / 8);*(target + (i * newW + j)*newInfo.biBitCount / 8 + 1) = *(src + (j * w + newH - i - 1)*newInfo.biBitCount / 8 + 1);*(target + (i * newW + j)*newInfo.biBitCount / 8 + 2) = *(src + (j * w + newH - i - 1)*newInfo.biBitCount / 8 + 2);if (newInfo.biBitCount == 32) {*(target + (i * newW + j) * newInfo.biBitCount / 8 + 3) =*(src + (j * w + newH - i - 1) * newInfo.biBitCount / 8 + 3);}}}

struct Plus{DWORD        bV5RedMask;DWORD        bV5GreenMask;DWORD        bV5BlueMask;DWORD        bV5AlphaMask;DWORD        bV5CSType;CIEXYZTRIPLE bV5Endpoints;DWORD        bV5GammaRed;DWORD        bV5GammaGreen;DWORD        bV5GammaBlue;DWORD        bV5Intent;DWORD        bV5ProfileData;DWORD        bV5ProfileSize;DWORD        bV5Reserved;
};

typedef int FXPT2DOT30;

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cmath>
using namespace std;typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned int DWORD;
typedef int FXPT2DOT30;typedef struct tagCIEXYZ
{FXPT2DOT30 ciexyzX ;FXPT2DOT30 ciexyzY ;FXPT2DOT30 ciexyzZ ;
}
CIEXYZ, * LPCIEXYZ ;typedef struct tagCIEXYZTRIPLE {CIEXYZ ciexyzRed ;CIEXYZ ciexyzGreen ;CIEXYZ ciexyzBlue ;
}CIEXYZTRIPLE;//位图文件头定义;
struct  Header{DWORD bfSize;//文件大小WORD bfReserved1;//保留字WORD bfReserved2;//保留字DWORD bfOffBits;//从文件头到实际位图数据的偏移字节数
};//位图信息头定义
struct Info{DWORD biSize;//信息头大小DWORD biWidth;//图像宽度DWORD biHeight;//图像高度WORD biPlanes;//位平面数，必须为1WORD biBitCount;//每像素位数DWORD  biCompression; //压缩类型DWORD  biSizeImage; //压缩图像大小字节数DWORD  biXPelsPerMeter; //水平分辨率DWORD  biYPelsPerMeter; //垂直分辨率DWORD  biClrUsed; //位图实际用到的色彩数DWORD  biClrImportant; //本位图中重要的色彩数
};struct Plus{DWORD        bV5RedMask;DWORD        bV5GreenMask;DWORD        bV5BlueMask;DWORD        bV5AlphaMask;DWORD        bV5CSType;CIEXYZTRIPLE bV5Endpoints;DWORD        bV5GammaRed;DWORD        bV5GammaGreen;DWORD        bV5GammaBlue;DWORD        bV5Intent;DWORD        bV5ProfileData;DWORD        bV5ProfileSize;DWORD        bV5Reserved;
};WORD bfType;//文件类型
Header srcHead;//原文件文件头
Info srcInfo;//原文件信息头
Plus srcPlus;
int h,w,size;//原图像的高度、宽度和尺寸int getDiff(Info & info)
{int DataSizePerline = (info.biWidth * info.biBitCount+31) / 8;DataSizePerline -= DataSizePerline % 4;return DataSizePerline - info.biWidth * info.biBitCount / 8;
}void rotation(const BYTE* src){int newH = w;int newW = h;//图片旋转90度之后宽度、高度互换int newSize = newH * newW;FILE *p;p=fopen("dest.bmp","wb");Header newHead = srcHead;Info newInfo = srcInfo;Plus newPlus = srcPlus;//修改旋转后图片的尺寸、宽度和高度newHead.bfSize = (DWORD)(newHead.bfSize);newInfo.biHeight = (DWORD)newH;newInfo.biWidth = (DWORD)newW;int newdiff = getDiff(newInfo);newInfo.biSizeImage = (DWORD)((newInfo.biWidth * newInfo.biBitCount / 8 + newdiff) * newInfo.biHeight);//将种类、文件头、信息头写入新bmp文件fwrite(&bfType,1, sizeof(WORD),p);fwrite(&newHead,1, sizeof(Header),p);fwrite(&newInfo,1, sizeof(Info),p);if (newInfo.biBitCount == 32){fwrite(&newPlus, 1, sizeof(Plus), p);}BYTE* target = new BYTE[newSize * newInfo.biBitCount / 8];for (int i=0; i<newH; i++){for (int j=0; j<newW; j++){*(target + (i * newW + j)*newInfo.biBitCount / 8) = *(src + (j * w + newH - i - 1)*newInfo.biBitCount / 8);*(target + (i * newW + j)*newInfo.biBitCount / 8 + 1) = *(src + (j * w + newH - i - 1)*newInfo.biBitCount / 8 + 1);*(target + (i * newW + j)*newInfo.biBitCount / 8 + 2) = *(src + (j * w + newH - i - 1)*newInfo.biBitCount / 8 + 2);if (newInfo.biBitCount == 32) {*(target + (i * newW + j) * newInfo.biBitCount / 8 + 3) =*(src + (j * w + newH - i - 1) * newInfo.biBitCount / 8 + 3);}}}for (int i=0; i<newH; i++){fwrite(target + i * newW * (newInfo.biBitCount / 8), newInfo.biBitCount / 8, newW, p);fseek(p, newdiff, SEEK_CUR);}fclose(p);delete []target;
}int main(){FILE* p;p = fopen("src.bmp", "rb");if (p != NULL){//先读取文件类型fread(&bfType, 1, sizeof(WORD), p);//读取bmp文件的文件头和信息头fread(&srcHead,1, sizeof(Header), p);fread(&srcInfo,1, sizeof(Info), p);if (srcInfo.biBitCount == 32){fread(&srcPlus, 1, sizeof(Plus), p);}h=srcInfo.biHeight;w=srcInfo.biWidth;size = w * h;BYTE *imgdata=new BYTE[size * srcInfo.biBitCount / 8];int diff = getDiff(srcInfo);//读取原图片像素信息for (int i=0;i<h;i++){fread(imgdata + i * w * srcInfo.biBitCount / 8, srcInfo.biBitCount / 8, w, p);fseek(p, diff, SEEK_CUR);}fclose(p);rotation(imgdata);delete []imgdata;}else{cout<<"无法打开文件"<<endl;}return 0;
}