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March 2006

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2006.03.16 16:53 "libtiff query", by Jan N

Hello,
   
i was using ifl library earlier to work on the tiff images, and now i need
to do the same code using libtiff, any help on the code would be greatly
appritiated,
   
the code which needs conversion is..
   
BoundingBox * CShakeCropUtilDlg::calcBoundsTIF(CString basename, int
frame)
{
  BoundingBox *ret = new BoundingBox();
  ret->frame = frame;
  char fullname[300];
  char fullnamePad[300];
  sprintf(fullname,"%s.%d.tif",basename,frame);
  bool padded = false;
  iflStatus sts;
  iflFile* file = iflFile::open(fullname, O_RDONLY, &sts);
  if (sts != iflOKAY) { 
    sprintf(fullnamePad,"%s.%s.tif",basename,pad(frame).GetBuffer(20));
    file = iflFile::open(fullnamePad, O_RDONLY, &sts);
    padded = true;
    if (sts != iflOKAY) { 
      char err[200];
      sprintf(err,"Can't load %s OR %s",fullname,fullnamePad);
      AfxMessageBox(err,MB_OK | MB_ICONEXCLAMATION );
      return NULL;
    }
  }
  // read the entire image (just the first plane in z if image has depth)
  // into a buffer of unsiged chars
  iflSize dims;
  file->getDimensions(dims);
  //char err[200];
  //sprintf(err,"%s size %d %d",fullname,dims.x,dims.y);
  //AfxMessageBox(err,MB_OK | MB_ICONEXCLAMATION );
  unsigned char* data = new unsigned char[dims.x*dims.y*dims.c];
  iflConfig cfg(iflUChar, iflInterleaved);
  sts = file->getTile(0, 0, 0, dims.x, dims.y, 1, data, &cfg);
  if (sts != iflOKAY) {/*handle error */}
   
  bool isBlack = true;
  int minX = dims.x + 1;
  int maxX = -1;
  int minY = dims.y + 1;
  int maxY = -1;
  int x,y,c;
  int i = 0;
  for(y = (dims.y - 1); y >= 0; y--) {
    for(x = 0; x < dims.x; x++ ) {
      for( c = 0; c < dims.c; c++) {
        if (data[i] != 0 ) {
          isBlack = false;
          if (x < minX ) minX = x;
          if (x > maxX ) maxX = x;
          if (y < minY ) minY = y;
          if (y > maxY ) maxY = y;
        }
        i++;
      }
    }
  }
   
  delete [] data;
  // close the file
  file->close();
  if ( minX == 0 ) 
    ret->left = minX;
  else 
    ret->left = minX - 1;
  if ( maxX == dims.x )
    ret->right = maxX;
  else 
    ret->right = maxX + 1;
  
  if ( minY == 0 ) 
    ret->bottom = minY;
  else 
    ret->bottom = minY - 1;
  if ( maxY == dims.y )
    ret->top = maxY;
  else 
    ret->top = maxY + 1;
  // deal with a black frame
  if ( isBlack) {
    ret->bottom = 0;
    ret->left = 0;
    ret->top = 1;
    ret->right = 1;
  }
  return ret;
}