165         int* _mag = mag_buf[(i > 0) + 1] + 1;  in cvCanny()  local
166         float* _magf = (float*)_mag;  in cvCanny()
176             _mag[-1] = _mag[size.width] = 0;  in cvCanny()
180                     _mag[j] = abs(_dx[j]) + abs(_dy[j]);  in cvCanny()
202             memset( _mag-1, 0, (size.width + 2)*sizeof(int) );  in cvCanny()
212         _mag = mag_buf[1] + 1; // take the central row  in cvCanny()
238             int m = _mag[j];  in cvCanny()
251                     if( m > _mag[j-1] && m >= _mag[j+1] )  in cvCanny()
265                     if( m > _mag[j+magstep2] && m >= _mag[j+magstep1] )  in cvCanny()
280                     if( m > _mag[j+magstep2-s] && m > _mag[j+magstep1+s] )  in cvCanny()
298         _mag = mag_buf[0];  in cvCanny()
301         mag_buf[2] = _mag;  in cvCanny()