[cairo] [PATCH 03/54] core: allow NULL parameter for _cairo_path_fixed_is_box() and _cairo_path_fixed_is_stroke_box()

[Enrico Weigelt, metux IT consult]

Allow these functions to be called with NULL parameter for the
return buffer, so we can use it for only checking whether
a path is a box, w/o actually returning the box dimensions.

This feature will be used in subsequent patches.

Signed-off-by: Enrico Weigelt, metux IT consult <enrico.weigelt at gr13.net>
---
 src/cairo-path-fixed.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/cairo-path-fixed.c b/src/cairo-path-fixed.c
index ac44bb7..3d49596 100644
--- a/src/cairo-path-fixed.c
+++ b/src/cairo-path-fixed.c
@@ -1295,7 +1295,8 @@ _cairo_path_fixed_is_box (const cairo_path_fixed_t *path,
 
     buf = cairo_path_head (path);
     if (_points_form_rect (buf->points)) {
-	_canonical_box (box, &buf->points[0], &buf->points[2]);
+	if (box != NULL)
+	    _canonical_box (box, &buf->points[0], &buf->points[2]);
 	return TRUE;
     }
 
@@ -1413,7 +1414,8 @@ _cairo_path_fixed_is_stroke_box (const cairo_path_fixed_t *path,
 	buf->points[2].y == buf->points[3].y &&
 	buf->points[3].x == buf->points[0].x)
     {
-	_canonical_box (box, &buf->points[0], &buf->points[2]);
+	if (box != NULL)
+	    _canonical_box (box, &buf->points[0], &buf->points[2]);
 	return TRUE;
     }
 
@@ -1422,7 +1424,8 @@ _cairo_path_fixed_is_stroke_box (const cairo_path_fixed_t *path,
 	buf->points[2].x == buf->points[3].x &&
 	buf->points[3].y == buf->points[0].y)
     {
-	_canonical_box (box, &buf->points[0], &buf->points[2]);
+	if (box != NULL)
+	    _canonical_box (box, &buf->points[0], &buf->points[2]);
 	return TRUE;
     }
 
-- 
2.6.4.442.g545299f