[Pixman] [PATCH v14 12/22] pixman-filter: fix subsample_bits == 0

[spitzak at gmail.com]

From: Bill Spitzak <spitzak at gmail.com>

The position of only one subsample was wrong as ceil() was done on an integer.
Use a different function for all odd numbers of subsamples that gets this right.

Signed-off-by: Bill Spitzak <spitzak at gmail.com>
---
 pixman/pixman-filter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pixman/pixman-filter.c b/pixman/pixman-filter.c
index ac89dda..f9ad45f 100644
--- a/pixman/pixman-filter.c
+++ b/pixman/pixman-filter.c
@@ -252,7 +252,10 @@ create_1d_filter (int              width,
 	 * and sample positions.
 	 */
 
-	pos = ceil (frac - width / 2.0 - 0.5) + 0.5 - frac;
+	if (n_phases & 1)
+	    pos = frac - width / 2.0;
+	else
+	    pos = ceil (frac - width / 2.0 - 0.5) + 0.5 - frac;
 
 	total = 0;
 	for (x = 0; x < width; ++x, ++pos)
-- 
1.9.1