Android WebView: Make a custom Picture subclass

android_webview/native/aw_picture.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ANDROID_WEBVIEW_NATIVE_AW_PICTURE_H_
+#define ANDROID_WEBVIEW_NATIVE_AW_PICTURE_H_
+
+#include <jni.h>
+
+#include "base/android/jni_helper.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "skia/ext/refptr.h"
+
+class SkPicture;
+
+namespace android_webview {
+
+class AwPicture {
+ public:
+  AwPicture(skia::RefPtr<SkPicture> picture);
+
+  // Methods called from Java.
+  void Destroy(JNIEnv* env, jobject obj);
+  jint GetWidth(JNIEnv* env, jobject obj);
+  jint GetHeight(JNIEnv* env, jobject obj);
+  void Draw(JNIEnv* env, jobject obj, jobject canvas,
+            jint left, jint top, jint right, jint bottom);
+
+ private:
+  skia::RefPtr<SkPicture> picture_;
+};
+
+bool RegisterAwPicture(JNIEnv* env);
+
+}  // android_webview
+
+#endif  // ANDROID_WEBVIEW_NATIVE_AW_PICTURE_