#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
 
int main(int* argc, char** argv)
{
 FILE* fp = fopen("./threshold.bmp", "rb");
 if (fp == 0)
  return 0;
 BITMAPFILEHEADER fileHead;
 fread(&fileHead, sizeof(BITMAPFILEHEADER), 1, fp);
 
 BITMAPINFOHEADER infoHead;
 fread(&infoHead, sizeof(BITMAPINFOHEADER), 1, fp);
 int width = infoHead.biWidth;
 int height = infoHead.biHeight;
 int biCount = infoHead.biBitCount;
 
 int lineByte = (biCount*width / 8 + 3) / 4 * 4;
 RGBQUAD* pColorTable;
 pColorTable = new RGBQUAD[256];
 fread(pColorTable, sizeof(RGBQUAD), 256, fp);
 
 unsigned char* pBmpBuf,*pBmpBuf2;
 pBmpBuf = new unsigned char[lineByte*height];
 fread(pBmpBuf, lineByte*height, 1, fp);
 fclose(fp);
 
 // 新圖
 FILE* fop = fopen("thinging.bmp", "wb");
 if (fop == 0)
  return 0;
 
 pBmpBuf2 = new unsigned char[lineByte*height];
 for (int i = 0; i < height; ++i){
  for (int j = 0; j < width; ++j){
   *(pBmpBuf2 + i*lineByte + j) = *(pBmpBuf + i*lineByte + j);
  }
 }
 
 // 比較矩陣，0為黑，1為白； 
 // 1:不能；2：不能；3：能；4：不能；5：能；6：不能
 char str[6][8] = { { 0, 0, 0, 0, 0, 0, 0, 0, }, { 255, 0, 255, 0, 0, 255, 0, 0 },
 { 255, 0, 255, 255, 0, 255, 0, 255 }, { 255, 255, 255, 0, 0, 255, 255, 255 },
 { 255, 0, 255, 255, 0, 255, 255, 255 }, { 0, 255, 255, 255, 255, 255, 255, 255 } };
 int temp, k;
 char strTemp[8];
 for (int i = 1; i < height-1; ++i){
  for (int j = 1; j < width - 1; ++j){
   k = 0;
   for (int m = -1; m <= 1; ++m){
    for (int n = -1; n <= 1; ++n){
     temp = *(pBmpBuf + (i - m)*lineByte + (j + n));
     strTemp[k] = temp;
     k++;
    }
   }
   for (int k = 0; k < 6; ++k){
    if (strcmp(strTemp, str[k])==0){
     if (k == 3 || k == 5){
      *(pBmpBuf2 + i*lineByte + j) = 255;
     }
    }
   }
  }
 }
 
 
 fwrite(&fileHead, sizeof(BITMAPFILEHEADER), 1, fop);
 fwrite(&infoHead, sizeof(BITMAPINFOHEADER), 1, fop);
 fwrite(pColorTable, sizeof(RGBQUAD), 255, fop);
 fwrite(pBmpBuf2, lineByte*height, 1, fop);
 fclose(fop);
 
 system("pause");
 return 0;
}