c - Rotate pixels 90 / -90 degrees without extra memory allocation -


currently use next algorithm rotate 2d pixel array 90 degrees, requires memory buffer allocation. there way without allocating new entire buffer? , simple way specify if needs 90 , -90?

 unsigned int *output = (unsigned int*)malloc(inputbuffersize);   (int pixel = 0, x = width - 1; x > -1; --x)  {      (int y = 0; y < height; ++y)      {          output[pixel++] = input[width * y + x];      }  }


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