[Pixman] [PATCH v12 09/14] pixman-filter: Nested polynomial for cubic

spitzak at gmail.com spitzak at gmail.com
Mon Feb 8 09:06:57 CET 2016

```From: Bill Spitzak <spitzak at gmail.com>

v11: Restored range checks

Signed-off-by: Bill Spitzak <spitzak at gmail.com>
Reviewed-by: Oded Gabbay <oded.gabbay at gmail.com>
---
pixman/pixman-filter.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/pixman/pixman-filter.c b/pixman/pixman-filter.c
index e82871f..e5ef8e6 100644
--- a/pixman/pixman-filter.c
+++ b/pixman/pixman-filter.c
@@ -109,14 +109,16 @@ general_cubic (double x, double B, double C)

if (ax < 1)
{
-	return ((12 - 9 * B - 6 * C) * ax * ax * ax +
-		(-18 + 12 * B + 6 * C) * ax * ax + (6 - 2 * B)) / 6;
+	return (((12 - 9 * B - 6 * C) * ax +
+		 (-18 + 12 * B + 6 * C)) * ax * ax +
+		(6 - 2 * B)) / 6;
}
-    else if (ax >= 1 && ax < 2)
+    else if (ax < 2)
{
-	return ((-B - 6 * C) * ax * ax * ax +
-		(6 * B + 30 * C) * ax * ax + (-12 * B - 48 * C) *
-		ax + (8 * B + 24 * C)) / 6;
+	return ((((-B - 6 * C) * ax +
+		  (6 * B + 30 * C)) * ax +
+		 (-12 * B - 48 * C)) * ax +
+		(8 * B + 24 * C)) / 6;
}
else
{
--
1.9.1

```

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