1 files changed, 9 insertions, 0 deletions
diff --git a/jni/filters/contrast.c b/jni/filters/contrast.c
index 6c1b976cf..b04e9364e 100644
--- a/jni/filters/contrast.c
+++ b/jni/filters/contrast.c
@@ -27,6 +27,15 @@ unsigned char clamp(int c)
     return  (unsigned char) c;
 }
 
+int clampMax(int c,int max)
+{
+    c &= ~(c >> 31);
+    c -= max;
+    c &= (c >> 31);
+    c += max;
+    return  c;
+}
+
 void JNIFUNCF(ImageFilterContrast, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat bright)
 {
     char* destination = 0;