1 files changed, 107 insertions, 0 deletions
diff --git a/jni/filters/bw.c b/jni/filters/bw.c
new file mode 100644
index 000000000..f075d307e
--- /dev/null
+++ b/jni/filters/bw.c
@@ -0,0 +1,107 @@
+/*
+ * 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 "filters.h"
+
+void JNIFUNCF(ImageFilterBW, nativeApplyFilter, jobject bitmap, jint width, jint height)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    float Rf = 0.2999f;
+    float Gf = 0.587f;
+    float Bf = 0.114f;
+
+    for (i = 0; i < len; i+=4)
+    {
+        int r = destination[RED];
+        int g = destination[GREEN];
+        int b = destination[BLUE];
+        int t = CLAMP(Rf * r + Gf * g + Bf *b);
+
+        destination[RED] = t;
+        destination[GREEN] = t;
+        destination[BLUE] = t;
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}
+
+void JNIFUNCF(ImageFilterBWRed, nativeApplyFilter, jobject bitmap, jint width, jint height)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    for (i = 0; i < len; i+=4)
+    {
+        int r = destination[RED];
+        int g = destination[GREEN];
+        int b = destination[BLUE];
+        int t = (g + b) / 2;
+        r = t;
+        g = t;
+        b = t;
+        destination[RED] = r;
+        destination[GREEN] = g;
+        destination[BLUE] = b;
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}
+
+void JNIFUNCF(ImageFilterBWGreen, nativeApplyFilter, jobject bitmap, jint width, jint height)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    for (i = 0; i < len; i+=4)
+    {
+        int r = destination[RED];
+        int g = destination[GREEN];
+        int b = destination[BLUE];
+        int t = (r + b) / 2;
+        r = t;
+        g = t;
+        b = t;
+        destination[RED] = r;
+        destination[GREEN] = g;
+        destination[BLUE] = b;
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}
+
+void JNIFUNCF(ImageFilterBWBlue, nativeApplyFilter, jobject bitmap, jint width, jint height)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    for (i = 0; i < len; i+=4)
+    {
+        int r = destination[RED];
+        int g = destination[GREEN];
+        int b = destination[BLUE];
+        int t = (r + g) / 2;
+        r = t;
+        g = t;
+        b = t;
+        destination[RED] = r;
+        destination[GREEN] = g;
+        destination[BLUE] = b;
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}