1 files changed, 55 insertions, 0 deletions
diff --git a/jni/filters/bwfilter.c b/jni/filters/bwfilter.c
new file mode 100644
index 000000000..f7fb31ad1
--- /dev/null
+++ b/jni/filters/bwfilter.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <math.h>
+#include "filters.h"
+
+void JNIFUNCF(ImageFilterBwFilter, nativeApplyFilter, jobject bitmap, jint width, jint height, jint rw, jint gw, jint bw)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    unsigned char * rgb = (unsigned char * )destination;
+    float sr = rw;
+    float sg = gw;
+    float sb = bw;
+
+    float min = MIN(sg,sb);
+    min = MIN(sr,min);
+    float max =  MAX(sg,sb);
+    max = MAX(sr,max);
+    float avg = (min+max)/2;
+    sb /= avg;
+    sg /= avg;
+    sr /= avg;
+    int i;
+    int len = width * height * 4;
+
+    for (i = 0; i < len; i+=4)
+    {
+        float r = sr *rgb[RED];
+        float g = sg *rgb[GREEN];
+        float b = sb *rgb[BLUE];
+        min = MIN(g,b);
+        min = MIN(r,min);
+        max = MAX(g,b);
+        max = MAX(r,max);
+        avg =(min+max)/2;
+        rgb[RED]   = CLAMP(avg);
+        rgb[GREEN] = rgb[RED];
+        rgb[BLUE]  = rgb[RED];
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}