BMP文件右旋90度[c语言]
#include#include #include typedef unsigned short WORD;typedef unsigned int DWORD;typedef unsigned int LONG;#pragma pack(2)typedef struct tagBITMAPFILEHEADER{ WORD bfType; DWORD bfSize; WORD bfReserved1; WORD bfReserved2; DWORD bfOffBits;} BITMAPFILEHEADER;#pragma pack()typedef struct tagBITMAPINFOHEADER{ DWORD biSize; LONG biWidth; LONG biHeight; WORD biPlanes; WORD biBitCount; DWORD biCompression; DWORD biSizeImage; LONG biXPelsPerMeter; LONG biYPelsPerMeter; DWORD biClrUsed; DWORD biClrImportant;} BITMAPINFOHEADER;/* fname- 输入文件名称 foname-输出文件名 */void cw90(char *fname,char *foname) { BITMAPFILEHEADER fileHeader; BITMAPINFOHEADER infoHeader; unsigned char palette[8]; FILE *f = fopen(fname,"rb"); if(f == NULL) { printf("Can not find file %s/n",fname); return; } fread(&fileHeader,sizeof(BITMAPFILEHEADER),1,f); fread(&infoHeader,sizeof(BITMAPINFOHEADER),1,f); fread(palette,sizeof(unsigned char),8,f); unsigned char *data = (unsigned char*)malloc(infoHeader.biSizeImage); fread(data,sizeof(unsigned char),infoHeader.biSizeImage,f); FILE *of = fopen(foname,"wb"); BITMAPFILEHEADER oFileHeader; BITMAPINFOHEADER oInfoHeader; int lineSize = ( infoHeader.biHeight + 31) / 32 * 4; int imageSize = lineSize * infoHeader.biWidth; // //////////////////////// oFileHeader.bfType = 19778; oFileHeader.bfSize = 62 + imageSize; oFileHeader.bfReserved1 = 0; oFileHeader.bfReserved2 = 0; oFileHeader.bfOffBits = 62; // //////////////////////// oInfoHeader.biSize = 40; oInfoHeader.biWidth = infoHeader.biHeight; oInfoHeader.biHeight = infoHeader.biWidth; oInfoHeader.biPlanes = 1; oInfoHeader.biBitCount = 1; oInfoHeader.biCompression = 0; oInfoHeader.biSizeImage = imageSize; oInfoHeader.biXPelsPerMeter = 0; oInfoHeader.biYPelsPerMeter = 0; oInfoHeader.biClrUsed = 0; oInfoHeader.biClrImportant = 0; // //////////////////////// fwrite( &oFileHeader , sizeof(BITMAPFILEHEADER) , 1 , of ); fwrite( &oInfoHeader , sizeof(BITMAPINFOHEADER) , 1 , of ); fwrite( palette , 1 , 8 , of ); unsigned char *first = (unsigned char*)malloc(infoHeader.biHeight * oInfoHeader.biHeight); unsigned char *second = (unsigned char*)malloc(infoHeader.biHeight * oInfoHeader.biHeight); int myline = oInfoHeader.biSizeImage / oInfoHeader.biHeight; unsigned char *third = (unsigned char*)malloc(myline * 8 * oInfoHeader.biHeight); unsigned char *forth = (unsigned char*)malloc(myline * oInfoHeader.biHeight); unsigned char *img = (unsigned char*)malloc(oInfoHeader.biSizeImage); // first step int i,j,k,t = -1; int temp = infoHeader.biSizeImage / infoHeader.biHeight; for(i = 0; i < infoHeader.biHeight; i++) { for(j = 0; j < temp; j++) { for(k = 0; k < 8; k++) { if(j*8 + k < oInfoHeader.biHeight) { first[++t] = data[i * temp + j] >> (8-1-k) & 1; } } } } // second step // rotate t = -1; for(i = 0; i < oInfoHeader.biHeight; i++) { for(j = 0; j < infoHeader.biHeight; j++) { second[++t] = first[oInfoHeader.biHeight*j + oInfoHeader.biHeight - i - 1]; } } // step three // fill with 0's t = -1; for(i = 0; i < oInfoHeader.biHeight; i++) { for(j = 0; j < infoHeader.biHeight; j++) { third[++t] = second[i*infoHeader.biHeight + j]; } for(k = infoHeader.biHeight; k < myline * 8; k++) { third[++t] = 0; } } // step four // transfer int u = -1; int m = -1; for(i = 0; i < oInfoHeader.biHeight; i++) { for(j = 0; j < myline * 8; j++) { int sum = 0; for(k = 0; k < 8; k++) { sum += pow(2,8-k-1)*third[++m%t]; } forth[++u] = sum; } } fwrite( forth , 1 , myline * oInfoHeader.biHeight , of ); free(img); free(data); fclose(f); fclose(of); }int main() { cw90("original.bmp","ttt.bmp"); system("pause"); return 0;}
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