| /* |
| * 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); |
| } |