Thread: Rotating a .bmp image by a multiple of 90 in C

I tried implementing your approach but it didnt quite work :-/. I really don't know why.

Code:

int rotate(PIXEL* original, int rows, int cols, int rotation,
           PIXEL** new, int* newrows, int* newcols)
{


  int c,r;
  //for 90 or -270 degrees
  if(rotation == 90 || rotation == -270 )
  {


        for(r = 0; r < rows; r++)
        {
                for(c = 0; c < cols; c++ )
                {
                        *newcols = -r;
                        *newrows = c;


                }//end of for
        }//end of for
  }//end of if




  return 0;
}