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      1 /*
      2  * Copyright (C) 2018 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.fonts;
     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.tools.layoutlib.annotations.LayoutlibDelegate;
     23 
     24 import android.annotation.NonNull;
     25 import android.content.res.AssetManager;
     26 
     27 import java.io.File;
     28 import java.io.IOException;
     29 import java.nio.ByteBuffer;
     30 import java.nio.file.Files;
     31 
     32 import libcore.util.NativeAllocationRegistry_Delegate;
     33 
     34 /**
     35  * Delegate implementing the native methods of android.graphics.fonts.Font$Builder
     36  * <p>
     37  * Through the layoutlib_create tool, the original native methods of Font$Builder have been
     38  * replaced by calls to methods of the same name in this delegate class.
     39  * <p>
     40  * This class behaves like the original native implementation, but in Java, keeping previously
     41  * native data into its own objects and mapping them to int that are sent back and forth between it
     42  * and the original Font$Builder class.
     43  *
     44  * @see DelegateManager
     45  */
     46 public class Font_Builder_Delegate {
     47     protected static final DelegateManager<Font_Builder_Delegate> sBuilderManager =
     48             new DelegateManager<>(Font_Builder_Delegate.class);
     49     private static final DelegateManager<String> sAssetManager =
     50             new DelegateManager<>(String.class);
     51     private static long sFontFinalizer = -1;
     52     private static long sAssetFinalizer = -1;
     53 
     54     protected ByteBuffer mBuffer;
     55     protected int mWeight;
     56     protected boolean mItalic;
     57     protected int mTtcIndex;
     58     protected String filePath;
     59 
     60     @LayoutlibDelegate
     61     /*package*/ static long nInitBuilder() {
     62         return sBuilderManager.addNewDelegate(new Font_Builder_Delegate());
     63     }
     64 
     65     @LayoutlibDelegate
     66     /*package*/ static long nGetNativeAsset(
     67             @NonNull AssetManager am, @NonNull String path, boolean isAsset, int cookie) {
     68         return sAssetManager.addNewDelegate(path);
     69     }
     70 
     71     @LayoutlibDelegate
     72     /*package*/ static ByteBuffer nGetAssetBuffer(long nativeAsset) {
     73         String fullPath = sAssetManager.getDelegate(nativeAsset);
     74         if (fullPath == null) {
     75             return null;
     76         }
     77         try {
     78             byte[] byteArray = Files.readAllBytes(new File(fullPath).toPath());
     79             return ByteBuffer.wrap(byteArray);
     80         } catch (IOException e) {
     81             Bridge.getLog().error(LayoutLog.TAG_MISSING_ASSET,
     82                     "Error mapping font file " + fullPath, null, null, null);
     83             return null;
     84         }
     85     }
     86 
     87     @LayoutlibDelegate
     88     /*package*/ static long nGetReleaseNativeAssetFunc() {
     89         synchronized (Font_Builder_Delegate.class) {
     90             if (sAssetFinalizer == -1) {
     91                 sAssetFinalizer = NativeAllocationRegistry_Delegate.createFinalizer(
     92                         sAssetManager::removeJavaReferenceFor);
     93             }
     94         }
     95         return sAssetFinalizer;
     96     }
     97 
     98     @LayoutlibDelegate
     99     /*package*/ static void nAddAxis(long builderPtr, int tag, float value) {
    100         Bridge.getLog().fidelityWarning(LayoutLog.TAG_UNSUPPORTED,
    101                 "Font$Builder.nAddAxis is not supported.", null, null, null);
    102     }
    103 
    104     @LayoutlibDelegate
    105     /*package*/ static long nBuild(long builderPtr, ByteBuffer buffer, String filePath, int weight,
    106             boolean italic, int ttcIndex) {
    107         Font_Builder_Delegate font = sBuilderManager.getDelegate(builderPtr);
    108         if (font != null) {
    109             font.mBuffer = buffer;
    110             font.mWeight = weight;
    111             font.mItalic = italic;
    112             font.mTtcIndex = ttcIndex;
    113             font.filePath = filePath;
    114         }
    115         return builderPtr;
    116     }
    117 
    118     @LayoutlibDelegate
    119     /*package*/ static long nGetReleaseNativeFont() {
    120         synchronized (Font_Builder_Delegate.class) {
    121             if (sFontFinalizer == -1) {
    122                 sFontFinalizer = NativeAllocationRegistry_Delegate.createFinalizer(
    123                         sBuilderManager::removeJavaReferenceFor);
    124             }
    125         }
    126         return sFontFinalizer;
    127     }
    128 }
    129