Re: [PATCH 0/1] MR2839: gdiplus: Improve performance of GdipInvertMatrix.

[Bartosz Kosiorek (＠gang65)]

Bartosz Kosiorek (@gang65) commented about dlls/gdiplus/matrix.c:
> -
> -
>    return Ok;
> -
>    if (matrix->matrix[0] != 0 && matrix->matrix[3] != 0)
> -
>    {
> -
>        matrix->matrix[4] = -matrix->matrix[4] / matrix->matrix[0];
> -
>        matrix->matrix[5] = -matrix->matrix[5] / matrix->matrix[3];
> -
>        matrix->matrix[0] = 1 / matrix->matrix[0];
> -
>        matrix->matrix[3] = 1 / matrix->matrix[3];
> -
> -
>        return Ok;
> -
>    }
> -
>    else
> -
>        return InvalidParameter;
> }
> - det = matrix_det(matrix);

We are calculating `matrix_det` only once (previously it was done also inside GdipIsMatrixInvertible)