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
17package com.android.gallery3d.filtershow.filters;
18
19import android.content.res.Resources;
20import android.graphics.Bitmap;
21import android.graphics.BitmapFactory;
22import com.android.gallery3d.app.Log;
23
24public class ImageFilterFx extends ImageFilter {
25    private static final String LOGTAG = "ImageFilterFx";
26    private FilterFxRepresentation mParameters = null;
27    private Bitmap mFxBitmap = null;
28    private Resources mResources = null;
29    private int mFxBitmapId = 0;
30
31    public ImageFilterFx() {
32    }
33
34    @Override
35    public void freeResources() {
36        if (mFxBitmap != null) mFxBitmap.recycle();
37        mFxBitmap = null;
38    }
39
40    @Override
41    public FilterRepresentation getDefaultRepresentation() {
42        return null;
43    }
44
45    public void useRepresentation(FilterRepresentation representation) {
46        FilterFxRepresentation parameters = (FilterFxRepresentation) representation;
47        mParameters = parameters;
48    }
49
50    public FilterFxRepresentation getParameters() {
51        return mParameters;
52    }
53
54    native protected void nativeApplyFilter(Bitmap bitmap, int w, int h,
55                                            Bitmap fxBitmap, int fxw, int fxh,
56                                            int start, int end);
57
58    @Override
59    public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
60        if (getParameters() == null || mResources == null) {
61            return bitmap;
62        }
63
64        int w = bitmap.getWidth();
65        int h = bitmap.getHeight();
66
67        int bitmapResourceId = getParameters().getBitmapResource();
68        if (bitmapResourceId == 0) { // null filter fx
69            return bitmap;
70        }
71
72        if (mFxBitmap == null || mFxBitmapId != bitmapResourceId) {
73            BitmapFactory.Options o = new BitmapFactory.Options();
74            o.inScaled = false;
75            mFxBitmapId = bitmapResourceId;
76            if (mFxBitmapId != 0) {
77                mFxBitmap = BitmapFactory.decodeResource(mResources, mFxBitmapId, o);
78            } else {
79                Log.w(LOGTAG, "bad resource for filter: " + mName);
80            }
81        }
82
83        if (mFxBitmap == null) {
84            return bitmap;
85        }
86
87        int fxw = mFxBitmap.getWidth();
88        int fxh = mFxBitmap.getHeight();
89
90        int stride = w * 4;
91        int max = stride * h;
92        int increment = stride * 256; // 256 lines
93        for (int i = 0; i < max; i += increment) {
94            int start = i;
95            int end = i + increment;
96            if (end > max) {
97                end = max;
98            }
99            if (!getEnvironment().needsStop()) {
100                nativeApplyFilter(bitmap, w, h, mFxBitmap, fxw, fxh, start, end);
101            }
102        }
103
104        return bitmap;
105    }
106
107    public void setResources(Resources resources) {
108        mResources = resources;
109    }
110
111}
112