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 <math.h>
18 #include <stdlib.h>
19
20 #include "filters.h"
21
JNIFUNCF(ImageFilterShadows,nativeApplyFilter,jobject bitmap,jint width,jint height,float scale)22 void JNIFUNCF(ImageFilterShadows, nativeApplyFilter, jobject bitmap, jint width, jint height, float scale){
23 double shadowFilterMap[] = {
24 -0.00591, 0.0001,
25 1.16488, 0.01668,
26 -0.18027, -0.06791,
27 -0.12625, 0.09001,
28 0.15065, -0.03897
29 };
30
31 char* destination = 0;
32 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
33 unsigned char * rgb = (unsigned char * )destination;
34 int i;
35 double s = (scale>=0)?scale:scale/5;
36 int len = width * height * 4;
37
38 double *poly = (double *) malloc(5*sizeof(double));
39 for (i = 0; i < 5; i++) {
40 poly[i] = fastevalPoly(shadowFilterMap+i*2,2 , s);
41 }
42
43 unsigned short * hsv = (unsigned short *)malloc(3*sizeof(short));
44
45 for (i = 0; i < len; i+=4)
46 {
47 rgb2hsv(rgb,i,hsv,0);
48
49 double v = (fastevalPoly(poly,5,hsv[0]/4080.)*4080);
50 if (v>4080) v = 4080;
51 hsv[0] = (unsigned short) ((v>0)?v:0);
52
53 hsv2rgb(hsv,0, rgb,i);
54 }
55
56 free(poly);
57 free(hsv);
58 AndroidBitmap_unlockPixels(env, bitmap);
59 }
60