1/*
2 * Copyright (C) 2010 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.glrenderer;
18
19import android.graphics.Rect;
20
21import java.nio.ByteBuffer;
22import java.nio.ByteOrder;
23
24// See "frameworks/base/include/utils/ResourceTypes.h" for the format of
25// NinePatch chunk.
26class NinePatchChunk {
27
28    public static final int NO_COLOR = 0x00000001;
29    public static final int TRANSPARENT_COLOR = 0x00000000;
30
31    public Rect mPaddings = new Rect();
32
33    public int mDivX[];
34    public int mDivY[];
35    public int mColor[];
36
37    private static void readIntArray(int[] data, ByteBuffer buffer) {
38        for (int i = 0, n = data.length; i < n; ++i) {
39            data[i] = buffer.getInt();
40        }
41    }
42
43    private static void checkDivCount(int length) {
44        if (length == 0 || (length & 0x01) != 0) {
45            throw new RuntimeException("invalid nine-patch: " + length);
46        }
47    }
48
49    public static NinePatchChunk deserialize(byte[] data) {
50        ByteBuffer byteBuffer =
51                ByteBuffer.wrap(data).order(ByteOrder.nativeOrder());
52
53        byte wasSerialized = byteBuffer.get();
54        if (wasSerialized == 0) return null;
55
56        NinePatchChunk chunk = new NinePatchChunk();
57        chunk.mDivX = new int[byteBuffer.get()];
58        chunk.mDivY = new int[byteBuffer.get()];
59        chunk.mColor = new int[byteBuffer.get()];
60
61        checkDivCount(chunk.mDivX.length);
62        checkDivCount(chunk.mDivY.length);
63
64        // skip 8 bytes
65        byteBuffer.getInt();
66        byteBuffer.getInt();
67
68        chunk.mPaddings.left = byteBuffer.getInt();
69        chunk.mPaddings.right = byteBuffer.getInt();
70        chunk.mPaddings.top = byteBuffer.getInt();
71        chunk.mPaddings.bottom = byteBuffer.getInt();
72
73        // skip 4 bytes
74        byteBuffer.getInt();
75
76        readIntArray(chunk.mDivX, byteBuffer);
77        readIntArray(chunk.mDivY, byteBuffer);
78        readIntArray(chunk.mColor, byteBuffer);
79
80        return chunk;
81    }
82}