src/android_webview/java/src/org/chromium/android_webview/AwPicture.java

   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