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 "kmeans.h"
19
20#ifdef __cplusplus
21extern "C" {
22#endif
23
24/*
25 * For reasonable speeds:
26 * k < 30
27 * small_ds_bitmap width/height < 64 pixels.
28 * large_ds_bitmap width/height < 512 pixels
29 *
30 * bad for high-frequency image noise
31 */
32
33void JNIFUNCF(ImageFilterKMeans, nativeApplyFilter, jobject bitmap, jint width, jint height,
34        jobject large_ds_bitmap, jint lwidth, jint lheight, jobject small_ds_bitmap,
35        jint swidth, jint sheight, jint p, jint seed)
36{
37    char* destination = 0;
38    char* larger_ds_dst = 0;
39    char* smaller_ds_dst = 0;
40    AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
41    AndroidBitmap_lockPixels(env, large_ds_bitmap, (void**) &larger_ds_dst);
42    AndroidBitmap_lockPixels(env, small_ds_bitmap, (void**) &smaller_ds_dst);
43    unsigned char * dst = (unsigned char *) destination;
44
45    unsigned char * small_ds = (unsigned char *) smaller_ds_dst;
46    unsigned char * large_ds = (unsigned char *) larger_ds_dst;
47
48    // setting for small bitmap
49    int len = swidth * sheight * 4;
50    int dimension = 3;
51    int stride = 4;
52    int iterations = 20;
53    int k = p;
54    unsigned int s = seed;
55    unsigned char finalCentroids[k * stride];
56
57    // get initial picks from small downsampled image
58    runKMeans<unsigned char, int>(k, finalCentroids, small_ds, len, dimension,
59            stride, iterations, s);
60
61
62    len = lwidth * lheight * 4;
63    iterations = 8;
64    unsigned char nextCentroids[k * stride];
65
66    // run kmeans on large downsampled image
67    runKMeansWithPicks<unsigned char, int>(k, nextCentroids, large_ds, len,
68            dimension, stride, iterations, finalCentroids);
69
70    len = width * height * 4;
71
72    // apply to final image
73    applyCentroids<unsigned char, int>(k, nextCentroids, dst, len, dimension, stride);
74
75    AndroidBitmap_unlockPixels(env, small_ds_bitmap);
76    AndroidBitmap_unlockPixels(env, large_ds_bitmap);
77    AndroidBitmap_unlockPixels(env, bitmap);
78}
79#ifdef __cplusplus
80}
81#endif
82