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-rw-r--r--jni/filters/vignette.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/jni/filters/vignette.c b/jni/filters/vignette.c
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+++ b/jni/filters/vignette.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"
+
+static int* gVignetteMap = 0;
+static int gVignetteWidth = 0;
+static int gVignetteHeight = 0;
+
+void __inline__ createVignetteMap(int w, int h)
+{
+ if (gVignetteMap && (gVignetteWidth != w || gVignetteHeight != h))
+ {
+ free(gVignetteMap);
+ gVignetteMap = 0;
+ }
+ if (gVignetteMap == 0)
+ {
+ gVignetteWidth = w;
+ gVignetteHeight = h;
+
+ int cx = w / 2;
+ int cy = h / 2;
+ int i, j;
+
+ gVignetteMap = malloc(w * h * sizeof(int));
+ float maxDistance = cx * cx * 2.0f;
+ for (i = 0; i < w; i++)
+ {
+ for (j = 0; j < h; j++)
+ {
+ float distance = (cx - i) * (cx - i) + (cy - j) * (cy - j);
+ gVignetteMap[j * w + i] = (int) (distance / maxDistance * 255);
+ }
+ }
+ }
+}
+
+void JNIFUNCF(ImageFilterVignette, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat strength)
+{
+ char* destination = 0;
+ AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
+ createVignetteMap(width, height);
+ int i;
+ int len = width * height * 4;
+ int vignette = 0;
+
+ for (i = 0; i < len; i += 4)
+ {
+ vignette = (int) (strength * gVignetteMap[i / 4]);
+ destination[RED] = CLAMP(destination[RED] - vignette);
+ destination[GREEN] = CLAMP(destination[GREEN] - vignette);
+ destination[BLUE] = CLAMP(destination[BLUE] - vignette);
+ }
+ AndroidBitmap_unlockPixels(env, bitmap);
+}