[matrix] Use hypot()

Use hypot() instead of open-coding sqrt(x*x + y*y). In theory, the
compiler could emit highly efficient code. In practice it's slower, but
more likely to be more accurate -- but the difference over a bare sqrt()
is likely not to be perceptible.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/cairo-matrix.c b/src/cairo-matrix.c
index b9e7290a6..6c83388e9 100644
--- a/src/cairo-matrix.c
+++ b/src/cairo-matrix.c
@@ -624,7 +624,7 @@ _cairo_matrix_compute_basis_scale_factors (const cairo_matrix_t *matrix,
 	double major, minor;
 
 	cairo_matrix_transform_distance (matrix, &x, &y);
-	major = sqrt(x*x + y*y);
+	major = hypot (x, y);
 	/*
 	 * ignore mirroring
 	 */
@@ -856,7 +856,7 @@ _cairo_matrix_transformed_circle_major_axis (const cairo_matrix_t *matrix,
     g = 0.5 * (i - j);
     h = a*c + b*d;
 
-    return radius * sqrt (f + sqrt (g*g+h*h));
+    return radius * sqrt (f + hypot (g, h));
 
     /*
      * we don't need the minor axis length, which is