1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "filters.h" 18 #include <math.h> 19 20 static int* gVignetteMap = 0; 21 static int gVignetteWidth = 0; 22 static int gVignetteHeight = 0; 23 24 void JNIFUNCF(ImageFilterVignette, nativeApplyFilter, jobject bitmap, jint width, jint height, jint centerx, jint centery, jfloat radiusx, jfloat radiusy, jfloat strength) 25 { 26 char* destination = 0; 27 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); 28 int i; 29 int len = width * height * 4; 30 int vignette = 0; 31 float d = centerx; 32 if (radiusx == 0) radiusx = 10; 33 if (radiusy == 0) radiusy = 10; 34 float scalex = 1/radiusx; 35 float scaley = 1/radiusy; 36 37 for (i = 0; i < len; i += 4) 38 { 39 int p = i/4; 40 float x = ((p%width)-centerx)*scalex; 41 float y = ((p/width)-centery)*scaley; 42 float dist = sqrt(x*x+y*y)-1; 43 vignette = (int) (strength*256*MAX(dist,0)); 44 destination[RED] = CLAMP(destination[RED] - vignette); 45 destination[GREEN] = CLAMP(destination[GREEN] - vignette); 46 destination[BLUE] = CLAMP(destination[BLUE] - vignette); 47 } 48 AndroidBitmap_unlockPixels(env, bitmap); 49 } 50
