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 17 package android.graphics; 18 19 import com.android.layoutlib.bridge.Bridge; 20 import com.android.layoutlib.bridge.impl.DelegateManager; 21 import com.android.ninepatch.NinePatchChunk; 22 import com.android.resources.Density; 23 import com.android.tools.layoutlib.annotations.LayoutlibDelegate; 24 25 import android.annotation.Nullable; 26 import com.android.layoutlib.bridge.util.NinePatchInputStream; 27 import android.graphics.BitmapFactory.Options; 28 import android.graphics.Bitmap_Delegate.BitmapCreateFlags; 29 30 import java.io.FileDescriptor; 31 import java.io.IOException; 32 import java.io.InputStream; 33 import java.util.EnumSet; 34 import 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 nativeDecodeStream(InputStream is, byte[] storage, @Nullable Rect padding, @Nullable Options opts)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 opts.inScaled = false; 63 } 64 65 try { 66 if (is instanceof NinePatchInputStream) { 67 NinePatchInputStream npis = (NinePatchInputStream) is; 68 npis.disableFakeMarkSupport(); 69 70 // load the bitmap as a nine patch 71 com.android.ninepatch.NinePatch ninePatch = com.android.ninepatch.NinePatch.load( 72 npis, true /*is9Patch*/, false /*convert*/); 73 74 // get the bitmap and chunk objects. 75 bm = Bitmap_Delegate.createBitmap(ninePatch.getImage(), bitmapCreateFlags, 76 density); 77 NinePatchChunk chunk = ninePatch.getChunk(); 78 79 // put the chunk in the bitmap 80 bm.setNinePatchChunk(NinePatch_Delegate.serialize(chunk)); 81 82 if (padding != null) { 83 // read the padding 84 int[] paddingArray = chunk.getPadding(); 85 padding.left = paddingArray[0]; 86 padding.top = paddingArray[1]; 87 padding.right = paddingArray[2]; 88 padding.bottom = paddingArray[3]; 89 } 90 } else { 91 // load the bitmap directly. 92 bm = Bitmap_Delegate.createBitmap(is, bitmapCreateFlags, density); 93 } 94 } catch (IOException e) { 95 Bridge.getLog().error(null, "Failed to load image", e, null); 96 } 97 98 return bm; 99 } 100 101 @LayoutlibDelegate nativeDecodeFileDescriptor(FileDescriptor fd, Rect padding, Options opts)102 /*package*/ static Bitmap nativeDecodeFileDescriptor(FileDescriptor fd, 103 Rect padding, Options opts) { 104 opts.inBitmap = null; 105 return null; 106 } 107 108 @LayoutlibDelegate nativeDecodeAsset(long asset, Rect padding, Options opts)109 /*package*/ static Bitmap nativeDecodeAsset(long asset, Rect padding, Options opts) { 110 opts.inBitmap = null; 111 return null; 112 } 113 114 @LayoutlibDelegate nativeDecodeByteArray(byte[] data, int offset, int length, Options opts)115 /*package*/ static Bitmap nativeDecodeByteArray(byte[] data, int offset, 116 int length, Options opts) { 117 opts.inBitmap = null; 118 return null; 119 } 120 121 @LayoutlibDelegate nativeIsSeekable(FileDescriptor fd)122 /*package*/ static boolean nativeIsSeekable(FileDescriptor fd) { 123 return true; 124 } 125 126 /** 127 * Set the newly decoded bitmap's density based on the Options. 128 * 129 * Copied from {@link BitmapFactory#setDensityFromOptions(Bitmap, Options)}. 130 */ 131 @LayoutlibDelegate setDensityFromOptions(Bitmap outputBitmap, Options opts)132 /*package*/ static void setDensityFromOptions(Bitmap outputBitmap, Options opts) { 133 if (outputBitmap == null || opts == null) return; 134 135 final int density = opts.inDensity; 136 if (density != 0) { 137 outputBitmap.setDensity(density); 138 final int targetDensity = opts.inTargetDensity; 139 if (targetDensity == 0 || density == targetDensity || density == opts.inScreenDensity) { 140 return; 141 } 142 143 // --- Change from original implementation begins --- 144 // LayoutLib doesn't scale the nine patch when decoding it. Hence, don't change the 145 // density of the source bitmap in case of ninepatch. 146 147 if (opts.inScaled) { 148 // --- Change from original implementation ends. --- 149 outputBitmap.setDensity(targetDensity); 150 } 151 } else if (opts.inBitmap != null) { 152 // bitmap was reused, ensure density is reset 153 outputBitmap.setDensity(Bitmap.getDefaultDensity()); 154 } 155 } 156 } 157