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 /** 52 * Cache map for {@link NinePatchChunk}. 53 * When the chunks are created they are serialized into a byte[], and both are put 54 * in the cache, using a {@link SoftReference} for the chunk. The default Java classes 55 * for {@link NinePatch} and {@link NinePatchDrawable} only reference to the byte[] data, and 56 * provide this for drawing. 57 * Using the cache map allows us to not have to deserialize the byte[] back into a 58 * {@link NinePatchChunk} every time a rendering is done. 59 */ 60 private final static Map<byte[], SoftReference<NinePatchChunk>> sChunkCache = 61 new HashMap<byte[], SoftReference<NinePatchChunk>>(); 62 63 // ---- Public Helper methods ---- 64 65 /** 66 * Serializes the given chunk. 67 * 68 * @return the serialized data for the chunk. 69 */ 70 public static byte[] serialize(NinePatchChunk chunk) { 71 // serialize the chunk to get a byte[] 72 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 73 ObjectOutputStream oos = null; 74 try { 75 oos = new ObjectOutputStream(baos); 76 oos.writeObject(chunk); 77 } catch (IOException e) { 78 Bridge.getLog().error(null, "Failed to serialize NinePatchChunk.", e, null /*data*/); 79 return null; 80 } finally { 81 if (oos != null) { 82 try { 83 oos.close(); 84 } catch (IOException e) { 85 } 86 } 87 } 88 89 // get the array and add it to the cache 90 byte[] array = baos.toByteArray(); 91 sChunkCache.put(array, new SoftReference<NinePatchChunk>(chunk)); 92 return array; 93 } 94 95 /** 96 * Returns a {@link NinePatchChunk} object for the given serialized representation. 97 * 98 * If the chunk is present in the cache then the object from the cache is returned, otherwise 99 * the array is deserialized into a {@link NinePatchChunk} object. 100 * 101 * @param array the serialized representation of the chunk. 102 * @return the NinePatchChunk or null if deserialization failed. 103 */ 104 public static NinePatchChunk getChunk(byte[] array) { 105 SoftReference<NinePatchChunk> chunkRef = sChunkCache.get(array); 106 NinePatchChunk chunk = chunkRef.get(); 107 if (chunk == null) { 108 ByteArrayInputStream bais = new ByteArrayInputStream(array); 109 ObjectInputStream ois = null; 110 try { 111 ois = new ObjectInputStream(bais); 112 chunk = (NinePatchChunk) ois.readObject(); 113 114 // put back the chunk in the cache 115 if (chunk != null) { 116 sChunkCache.put(array, new SoftReference<NinePatchChunk>(chunk)); 117 } 118 } catch (IOException e) { 119 Bridge.getLog().error(LayoutLog.TAG_BROKEN, 120 "Failed to deserialize NinePatchChunk content.", e, null /*data*/); 121 return null; 122 } catch (ClassNotFoundException e) { 123 Bridge.getLog().error(LayoutLog.TAG_BROKEN, 124 "Failed to deserialize NinePatchChunk class.", e, null /*data*/); 125 return null; 126 } finally { 127 if (ois != null) { 128 try { 129 ois.close(); 130 } catch (IOException e) { 131 } 132 } 133 } 134 } 135 136 return chunk; 137 } 138 139 // ---- native methods ---- 140 141 @LayoutlibDelegate 142 /*package*/ static boolean isNinePatchChunk(byte[] chunk) { 143 NinePatchChunk chunkObject = getChunk(chunk); 144 if (chunkObject != null) { 145 return true; 146 } 147 148 return false; 149 } 150 151 @LayoutlibDelegate 152 /*package*/ static void validateNinePatchChunk(int bitmap, byte[] chunk) { 153 // the default JNI implementation only checks that the byte[] has the same 154 // size as the C struct it represent. Since we cannot do the same check (serialization 155 // will return different size depending on content), we do nothing. 156 } 157 158 @LayoutlibDelegate 159 /*package*/ static void nativeDraw(int canvas_instance, RectF loc, int bitmap_instance, 160 byte[] c, int paint_instance_or_null, int destDensity, int srcDensity) { 161 draw(canvas_instance, 162 (int) loc.left, (int) loc.top, (int) loc.width(), (int) loc.height(), 163 bitmap_instance, c, paint_instance_or_null, 164 destDensity, srcDensity); 165 } 166 167 @LayoutlibDelegate 168 /*package*/ static void nativeDraw(int canvas_instance, Rect loc, int bitmap_instance, 169 byte[] c, int paint_instance_or_null, int destDensity, int srcDensity) { 170 draw(canvas_instance, 171 loc.left, loc.top, loc.width(), loc.height(), 172 bitmap_instance, c, paint_instance_or_null, 173 destDensity, srcDensity); 174 } 175 176 @LayoutlibDelegate 177 /*package*/ static int nativeGetTransparentRegion(int bitmap, byte[] chunk, Rect location) { 178 return 0; 179 } 180 181 // ---- Private Helper methods ---- 182 183 private static void draw(int canvas_instance, 184 final int left, final int top, final int right, final int bottom, 185 int bitmap_instance, byte[] c, int paint_instance_or_null, 186 final int destDensity, final int srcDensity) { 187 // get the delegate from the native int. 188 final Bitmap_Delegate bitmap_delegate = Bitmap_Delegate.getDelegate(bitmap_instance); 189 if (bitmap_delegate == null) { 190 return; 191 } 192 193 if (c == null) { 194 // not a 9-patch? 195 BufferedImage image = bitmap_delegate.getImage(); 196 Canvas_Delegate.native_drawBitmap(canvas_instance, bitmap_instance, 197 new Rect(0, 0, image.getWidth(), image.getHeight()), 198 new Rect(left, top, right, bottom), 199 paint_instance_or_null, destDensity, srcDensity); 200 return; 201 } 202 203 final NinePatchChunk chunkObject = getChunk(c); 204 assert chunkObject != null; 205 if (chunkObject == null) { 206 return; 207 } 208 209 Canvas_Delegate canvas_delegate = Canvas_Delegate.getDelegate(canvas_instance); 210 if (canvas_delegate == null) { 211 return; 212 } 213 214 // this one can be null 215 Paint_Delegate paint_delegate = Paint_Delegate.getDelegate(paint_instance_or_null); 216 217 canvas_delegate.getSnapshot().draw(new GcSnapshot.Drawable() { 218 @Override 219 public void draw(Graphics2D graphics, Paint_Delegate paint) { 220 chunkObject.draw(bitmap_delegate.getImage(), graphics, 221 left, top, right - left, bottom - top, destDensity, srcDensity); 222 } 223 }, paint_delegate, true /*compositeOnly*/, false /*forceSrcMode*/); 224 225 } 226 } 227
