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)

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https://gitlab.winehq.org/wine/wine/-/merge_requests/2839#note_32969