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 17 package android.graphics; 18 19 import com.android.ide.common.rendering.api.LayoutLog; 20 import com.android.layoutlib.bridge.Bridge; 21 import com.android.layoutlib.bridge.impl.DelegateManager; 22 import com.android.layoutlib.bridge.impl.GcSnapshot; 23 import com.android.ninepatch.NinePatchChunk; 24 import com.android.tools.layoutlib.annotations.LayoutlibDelegate; 25 26 import android.graphics.drawable.NinePatchDrawable; 27 28 import java.awt.Graphics2D; 29 import java.awt.image.BufferedImage; 30 import java.io.ByteArrayInputStream; 31 import java.io.ByteArrayOutputStream; 32 import java.io.IOException; 33 import java.io.ObjectInputStream; 34 import java.io.ObjectOutputStream; 35 import java.lang.ref.SoftReference; 36 import java.util.HashMap; 37 import java.util.Map; 38 39 /** 40 * Delegate implementing the native methods of android.graphics.NinePatch 41 * 42 * Through the layoutlib_create tool, the original native methods of NinePatch have been replaced 43 * by calls to methods of the same name in this delegate class. 44 * 45 * Because it's a stateless class to start with, there's no need to keep a {@link DelegateManager} 46 * around to map int to instance of the delegate. 47 * 48 */ 49 public final class NinePatch_Delegate { 50 51 // ---- delegate manager ---- 52 private static final DelegateManager<NinePatch_Delegate> sManager = 53 new DelegateManager<NinePatch_Delegate>(NinePatch_Delegate.class); 54 55 // ---- delegate helper data ---- 56 /** 57 * Cache map for {@link NinePatchChunk}. 58 * When the chunks are created they are serialized into a byte[], and both are put 59 * in the cache, using a {@link SoftReference} for the chunk. The default Java classes 60 * for {@link NinePatch} and {@link NinePatchDrawable} only reference to the byte[] data, and 61 * provide this for drawing. 62 * Using the cache map allows us to not have to deserialize the byte[] back into a 63 * {@link NinePatchChunk} every time a rendering is done. 64 */ 65 private final static Map<byte[], SoftReference<NinePatchChunk>> sChunkCache = 66 new HashMap<byte[], SoftReference<NinePatchChunk>>(); 67 68 // ---- delegate data ---- 69 private byte[] chunk; 70 71 72 // ---- Public Helper methods ---- 73 74 /** 75 * Serializes the given chunk. 76 * 77 * @return the serialized data for the chunk. 78 */ serialize(NinePatchChunk chunk)79 public static byte[] serialize(NinePatchChunk chunk) { 80 // serialize the chunk to get a byte[] 81 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 82 ObjectOutputStream oos = null; 83 try { 84 oos = new ObjectOutputStream(baos); 85 oos.writeObject(chunk); 86 } catch (IOException e) { 87 Bridge.getLog().error(null, "Failed to serialize NinePatchChunk.", e, null /*data*/); 88 return null; 89 } finally { 90 if (oos != null) { 91 try { 92 oos.close(); 93 } catch (IOException ignored) { 94 } 95 } 96 } 97 98 // get the array and add it to the cache 99 byte[] array = baos.toByteArray(); 100 sChunkCache.put(array, new SoftReference<NinePatchChunk>(chunk)); 101 return array; 102 } 103 104 /** 105 * Returns a {@link NinePatchChunk} object for the given serialized representation. 106 * 107 * If the chunk is present in the cache then the object from the cache is returned, otherwise 108 * the array is deserialized into a {@link NinePatchChunk} object. 109 * 110 * @param array the serialized representation of the chunk. 111 * @return the NinePatchChunk or null if deserialization failed. 112 */ getChunk(byte[] array)113 public static NinePatchChunk getChunk(byte[] array) { 114 SoftReference<NinePatchChunk> chunkRef = sChunkCache.get(array); 115 NinePatchChunk chunk = chunkRef.get(); 116 if (chunk == null) { 117 ByteArrayInputStream bais = new ByteArrayInputStream(array); 118 ObjectInputStream ois = null; 119 try { 120 ois = new ObjectInputStream(bais); 121 chunk = (NinePatchChunk) ois.readObject(); 122 123 // put back the chunk in the cache 124 if (chunk != null) { 125 sChunkCache.put(array, new SoftReference<NinePatchChunk>(chunk)); 126 } 127 } catch (IOException e) { 128 Bridge.getLog().error(LayoutLog.TAG_BROKEN, 129 "Failed to deserialize NinePatchChunk content.", e, null /*data*/); 130 return null; 131 } catch (ClassNotFoundException e) { 132 Bridge.getLog().error(LayoutLog.TAG_BROKEN, 133 "Failed to deserialize NinePatchChunk class.", e, null /*data*/); 134 return null; 135 } finally { 136 if (ois != null) { 137 try { 138 ois.close(); 139 } catch (IOException ignored) { 140 } 141 } 142 } 143 } 144 145 return chunk; 146 } 147 148 // ---- native methods ---- 149 150 @LayoutlibDelegate isNinePatchChunk(byte[] chunk)151 /*package*/ static boolean isNinePatchChunk(byte[] chunk) { 152 NinePatchChunk chunkObject = getChunk(chunk); 153 return chunkObject != null; 154 155 } 156 157 @LayoutlibDelegate validateNinePatchChunk(byte[] chunk)158 /*package*/ static long validateNinePatchChunk(byte[] chunk) { 159 // the default JNI implementation only checks that the byte[] has the same 160 // size as the C struct it represent. Since we cannot do the same check (serialization 161 // will return different size depending on content), we do nothing. 162 NinePatch_Delegate newDelegate = new NinePatch_Delegate(); 163 newDelegate.chunk = chunk; 164 return sManager.addNewDelegate(newDelegate); 165 } 166 167 @LayoutlibDelegate nativeFinalize(long chunk)168 /*package*/ static void nativeFinalize(long chunk) { 169 sManager.removeJavaReferenceFor(chunk); 170 } 171 172 173 @LayoutlibDelegate nativeGetTransparentRegion(Bitmap bitmap, long chunk, Rect location)174 /*package*/ static long nativeGetTransparentRegion(Bitmap bitmap, long chunk, Rect location) { 175 return 0; 176 } 177 getChunk(long nativeNinePatch)178 static byte[] getChunk(long nativeNinePatch) { 179 NinePatch_Delegate delegate = sManager.getDelegate(nativeNinePatch); 180 if (delegate != null) { 181 return delegate.chunk; 182 } 183 return null; 184 } 185 186 } 187