1 files changed, 65 insertions, 0 deletions
diff --git a/jni/filters/gradient.c b/jni/filters/gradient.c
new file mode 100644
index 000000000..1a8569786
--- /dev/null
+++ b/jni/filters/gradient.c
@@ -0,0 +1,65 @@
+/*
+ * 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(ImageFilter, nativeApplyGradientFilter, jobject bitmap, jint width, jint height,
+        jintArray redGradient, jintArray greenGradient, jintArray blueGradient)
+{
+    char* destination = 0;
+    jint* redGradientArray = 0;
+    jint* greenGradientArray = 0;
+    jint* blueGradientArray = 0;
+    if (redGradient)
+        redGradientArray = (*env)->GetIntArrayElements(env, redGradient, NULL);
+    if (greenGradient)
+        greenGradientArray = (*env)->GetIntArrayElements(env, greenGradient, NULL);
+    if (blueGradient)
+        blueGradientArray = (*env)->GetIntArrayElements(env, blueGradient, NULL);
+
+    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+    int i;
+    int len = width * height * 4;
+    for (i = 0; i < len; i+=4)
+    {
+        if (redGradient)
+        {
+            int r = destination[RED];
+            r = redGradientArray[r];
+            destination[RED] = r;
+        }
+        if (greenGradient)
+        {
+            int g = destination[GREEN];
+            g = greenGradientArray[g];
+            destination[GREEN] = g;
+        }
+        if (blueGradient)
+        {
+            int b = destination[BLUE];
+            b = blueGradientArray[b];
+            destination[BLUE] = b;
+        }
+    }
+    if (redGradient)
+        (*env)->ReleaseIntArrayElements(env, redGradient, redGradientArray, 0);
+    if (greenGradient)
+        (*env)->ReleaseIntArrayElements(env, greenGradient, greenGradientArray, 0);
+    if (blueGradient)
+        (*env)->ReleaseIntArrayElements(env, blueGradient, blueGradientArray, 0);
+    AndroidBitmap_unlockPixels(env, bitmap);
+}
+