1 files changed, 40 insertions, 0 deletions
diff --git a/media/libstagefright/filters/saturationARGB.rs b/media/libstagefright/filters/saturationARGB.rs
new file mode 100644
index 0000000..1de9dd8
--- /dev/null
+++ b/media/libstagefright/filters/saturationARGB.rs
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#pragma version(1)
+#pragma rs java_package_name(com.android.rs.cppbasic)
+#pragma rs_fp_relaxed
+
+const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
+
+// global variables (parameters accessible to application code)
+float gSaturation = 1.0f;
+
+void root(const uchar4 *v_in, uchar4 *v_out) {
+    v_out->x = v_in->x; // don't modify A
+
+    // get RGB, scale 0-255 uchar to 0-1.0 float
+    float3 rgb = {v_in->y * 0.003921569f, v_in->z * 0.003921569f,
+            v_in->w * 0.003921569f};
+
+    // apply saturation filter
+    float3 result = dot(rgb, gMonoMult);
+    result = mix(result, rgb, gSaturation);
+
+    v_out->y = (uchar)clamp((result.r * 255.f + 0.5f), 0.f, 255.f);
+    v_out->z = (uchar)clamp((result.g * 255.f + 0.5f), 0.f, 255.f);
+    v_out->w = (uchar)clamp((result.b * 255.f + 0.5f), 0.f, 255.f);
+}