diff options
Diffstat (limited to 'jni/filters/vignette.c')
-rw-r--r-- | jni/filters/vignette.c | 49 |
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); +} |