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