1 files changed, 18 insertions, 2 deletions
diff --git a/jni/filters/filters.h b/jni/filters/filters.h
index 3f8c3a07e..55c260f06 100644
--- a/jni/filters/filters.h
+++ b/jni/filters/filters.h
@@ -44,8 +44,24 @@ typedef unsigned int Color;
 #define ALPHA i+3
 #define CLAMP(c) (MAX(0, MIN(255, c)))
 
-__inline__ unsigned char  clamp(int c);
-__inline__ int clampMax(int c,int max);
+__inline__ unsigned char  clamp(int c)
+{
+    int N = 255;
+    c &= ~(c >> 31);
+    c -= N;
+    c &= (c >> 31);
+    c += N;
+    return  (unsigned char) c;
+}
+
+__inline__ int clampMax(int c,int max)
+{
+    c &= ~(c >> 31);
+    c -= max;
+    c &= (c >> 31);
+    c += max;
+    return  c;
+}
 
 extern void rgb2hsv( unsigned char *rgb,int rgbOff,unsigned short *hsv,int hsvOff);
 extern void hsv2rgb(unsigned short *hsv,int hsvOff,unsigned char  *rgb,int rgbOff);