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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 package org.chromium.android_webview;
      6 
      7 import android.graphics.Canvas;
      8 import android.graphics.Picture;
      9 
     10 import org.chromium.base.JNINamespace;
     11 import org.chromium.content.common.CleanupReference;
     12 
     13 import java.io.OutputStream;
     14 
     15 // A simple wrapper around a SkPicture, that allows final rendering to be performed using the
     16 // chromium skia library.
     17 @JNINamespace("android_webview")
     18 class AwPicture extends Picture {
     19 
     20     private long mNativeAwPicture;
     21 
     22     // There is no explicit destroy method on Picture base-class, so cleanup is always
     23     // handled via the CleanupReference.
     24     private static final class DestroyRunnable implements Runnable {
     25         private long mNativeAwPicture;
     26         private DestroyRunnable(long nativeAwPicture) {
     27             mNativeAwPicture = nativeAwPicture;
     28         }
     29         @Override
     30         public void run() {
     31             nativeDestroy(mNativeAwPicture);
     32         }
     33     }
     34 
     35     private CleanupReference mCleanupReference;
     36 
     37     /**
     38      * @param nativeAwPicture is an instance of the AwPicture native class. Ownership is
     39      *                        taken by this java instance.
     40      */
     41     AwPicture(long nativeAwPicture) {
     42         mNativeAwPicture = nativeAwPicture;
     43         mCleanupReference = new CleanupReference(this, new DestroyRunnable(nativeAwPicture));
     44     }
     45 
     46     @Override
     47     public Canvas beginRecording(int width, int height) {
     48         unsupportedOperation();
     49         return null;
     50     }
     51 
     52     @Override
     53     public void endRecording() {
     54         // Intentional no-op. The native picture ended recording prior to java c'tor call.
     55     }
     56 
     57     @Override
     58     public int getWidth() {
     59         return nativeGetWidth(mNativeAwPicture);
     60     }
     61 
     62     @Override
     63     public int getHeight() {
     64         return nativeGetHeight(mNativeAwPicture);
     65     }
     66 
     67     @Override
     68     public void draw(Canvas canvas) {
     69         nativeDraw(mNativeAwPicture, canvas);
     70     }
     71 
     72     @Override
     73     @SuppressWarnings("deprecation")
     74     public void writeToStream(OutputStream stream) {
     75         unsupportedOperation();
     76     }
     77 
     78     private void unsupportedOperation() {
     79         throw new IllegalStateException("Unsupported in AwPicture");
     80     }
     81 
     82     private static native void nativeDestroy(long nativeAwPicture);
     83     private native int nativeGetWidth(long nativeAwPicture);
     84     private native int nativeGetHeight(long nativeAwPicture);
     85     private native void nativeDraw(long nativeAwPicture, Canvas canvas);
     86 }
     87 
     88