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-rw-r--r--jni/filters/saturated.c53
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diff --git a/jni/filters/saturated.c b/jni/filters/saturated.c
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+/*
+ * 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(ImageFilterSaturated, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat saturation)
+{
+ 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;
+ float S = saturation;;
+ float MS = 1.0f - S;
+ float Rt = Rf * MS;
+ float Gt = Gf * MS;
+ float Bt = Bf * MS;
+ float R, G, B;
+ 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 = r;
+ G = g;
+ B = b;
+
+ float Rc = R * (Rt + S) + G * Gt + B * Bt;
+ float Gc = R * Rt + G * (Gt + S) + B * Bt;
+ float Bc = R * Rt + G * Gt + B * (Bt + S);
+
+ destination[RED] = CLAMP(Rc);
+ destination[GREEN] = CLAMP(Gc);
+ destination[BLUE] = CLAMP(Bc);
+ }
+ AndroidBitmap_unlockPixels(env, bitmap);
+}