1 files changed, 49 insertions, 0 deletions
diff --git a/jni/filters/vignette.c b/jni/filters/vignette.c
new file mode 100644
index 000000000..b9ee3ff01
--- /dev/null
+++ b/jni/filters/vignette.c
@@ -0,0 +1,49 @@
+/*
+ * 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"
+#include <math.h>
+
+static int* gVignetteMap = 0;
+static int gVignetteWidth = 0;
+static int gVignetteHeight = 0;
+
+void JNIFUNCF(ImageFilterVignette, nativeApplyFilter, jobject bitmap, jint width, jint height, jint centerx, jint centery, jfloat radiusx, jfloat radiusy, jfloat strength)
+{
+    char* destination = 0;
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    int vignette = 0;
+    float d = centerx;
+    if (radiusx == 0) radiusx = 10;
+    if (radiusy == 0) radiusy = 10;
+    float scalex = 1/radiusx;
+    float scaley = 1/radiusy;
+
+    for (i = 0; i < len; i += 4)
+    {
+        int p = i/4;
+        float x = ((p%width)-centerx)*scalex;
+        float y = ((p/width)-centery)*scaley;
+        float dist = sqrt(x*x+y*y)-1;
+        vignette = (int) (strength*256*MAX(dist,0));
+        destination[RED] = CLAMP(destination[RED] - vignette);
+        destination[GREEN] = CLAMP(destination[GREEN] - vignette);
+        destination[BLUE] = CLAMP(destination[BLUE] - vignette);
+    }
+    AndroidBitmap_unlockPixels(env, bitmap);
+}