1/*
2 * Copyright (C) 2011 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 android.graphics;
18
19import com.android.layoutlib.bridge.Bridge;
20import com.android.layoutlib.bridge.impl.DelegateManager;
21import com.android.ninepatch.NinePatchChunk;
22import com.android.resources.Density;
23import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
24
25import android.annotation.Nullable;
26import android.content.res.BridgeResources.NinePatchInputStream;
27import android.graphics.BitmapFactory.Options;
28import android.graphics.Bitmap_Delegate.BitmapCreateFlags;
29
30import java.io.FileDescriptor;
31import java.io.IOException;
32import java.io.InputStream;
33import java.util.EnumSet;
34import java.util.Set;
35
36/**
37 * Delegate implementing the native methods of android.graphics.BitmapFactory
38 *
39 * Through the layoutlib_create tool, the original native methods of BitmapFactory have been
40 * replaced by calls to methods of the same name in this delegate class.
41 *
42 * Because it's a stateless class to start with, there's no need to keep a {@link DelegateManager}
43 * around to map int to instance of the delegate.
44 *
45 */
46/*package*/ class BitmapFactory_Delegate {
47
48    // ------ Native Delegates ------
49
50    @LayoutlibDelegate
51    /*package*/ static Bitmap nativeDecodeStream(InputStream is, byte[] storage,
52            @Nullable Rect padding, @Nullable Options opts) {
53        Bitmap bm = null;
54
55        Density density = Density.MEDIUM;
56        Set<BitmapCreateFlags> bitmapCreateFlags = EnumSet.of(BitmapCreateFlags.MUTABLE);
57        if (opts != null) {
58            density = Density.getEnum(opts.inDensity);
59            if (opts.inPremultiplied) {
60                bitmapCreateFlags.add(BitmapCreateFlags.PREMULTIPLIED);
61            }
62        }
63
64        try {
65            if (is instanceof NinePatchInputStream) {
66                NinePatchInputStream npis = (NinePatchInputStream) is;
67                npis.disableFakeMarkSupport();
68
69                // load the bitmap as a nine patch
70                com.android.ninepatch.NinePatch ninePatch = com.android.ninepatch.NinePatch.load(
71                        npis, true /*is9Patch*/, false /*convert*/);
72
73                // get the bitmap and chunk objects.
74                bm = Bitmap_Delegate.createBitmap(ninePatch.getImage(), bitmapCreateFlags,
75                        density);
76                NinePatchChunk chunk = ninePatch.getChunk();
77
78                // put the chunk in the bitmap
79                bm.setNinePatchChunk(NinePatch_Delegate.serialize(chunk));
80
81                if (padding != null) {
82                    // read the padding
83                    int[] paddingArray = chunk.getPadding();
84                    padding.left = paddingArray[0];
85                    padding.top = paddingArray[1];
86                    padding.right = paddingArray[2];
87                    padding.bottom = paddingArray[3];
88                }
89            } else {
90                // load the bitmap directly.
91                bm = Bitmap_Delegate.createBitmap(is, bitmapCreateFlags, density);
92            }
93        } catch (IOException e) {
94            Bridge.getLog().error(null, "Failed to load image", e, null);
95        }
96
97        return bm;
98    }
99
100    @LayoutlibDelegate
101    /*package*/ static Bitmap nativeDecodeFileDescriptor(FileDescriptor fd,
102            Rect padding, Options opts) {
103        opts.inBitmap = null;
104        return null;
105    }
106
107    @LayoutlibDelegate
108    /*package*/ static Bitmap nativeDecodeAsset(long asset, Rect padding, Options opts) {
109        opts.inBitmap = null;
110        return null;
111    }
112
113    @LayoutlibDelegate
114    /*package*/ static Bitmap nativeDecodeByteArray(byte[] data, int offset,
115            int length, Options opts) {
116        opts.inBitmap = null;
117        return null;
118    }
119
120    @LayoutlibDelegate
121    /*package*/ static boolean nativeIsSeekable(FileDescriptor fd) {
122        return true;
123    }
124}
125