chrome/browser/android/compositor/scene_layer/scene_layer.h

   1 // Copyright 2015 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 #ifndef CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_SCENE_LAYER_H_
   6 #define CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_SCENE_LAYER_H_
   7
   8 #include <jni.h>
   9
  10 #include "base/android/jni_weak_ref.h"
  11 #include "base/android/scoped_java_ref.h"
  12 #include "base/basictypes.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "third_party/skia/include/core/SkColor.h"
  15
  16 namespace cc {
  17 class Layer;
  18 }
  19
  20 namespace chrome {
  21 namespace android {
  22
  23 // A native-side, cc::Layer based representation of how a scene should be drawn.
  24 // Basically, this is a wrapper around cc::Layer and bridge with its Java
  25 // counterpart.
  26 class SceneLayer {
  27  public:
  28   static SceneLayer* FromJavaObject(JNIEnv* env, jobject jobj);
  29
  30   // Create SceneLayer and creates an empty cc::Layer.
  31   SceneLayer(JNIEnv* env, jobject jobj);
  32   // Create SceneLayer with the already-instantiated |layer|.
  33
  34   SceneLayer(JNIEnv* env, jobject jobj, scoped_refptr<cc::Layer> layer);
  35   virtual ~SceneLayer();
  36
  37   // Notifies that this scene layer is about to be detached from its parent.
  38   // TODO(changwan): check if we can remove this.
  39   virtual void OnDetach();
  40
  41   // Java SceneLayer can use this method to destroy its native-side counterpart.
  42   virtual void Destroy(JNIEnv* env, jobject jobj);
  43
  44   // Returns cc::Layer object that this SceneLayer contains.
  45   scoped_refptr<cc::Layer> layer() { return layer_; }
  46
  47   // Returns whether we should show background when we draw this SceneLayer.
  48   virtual bool ShouldShowBackground();
  49
  50   // Returns the background color if it is needed.
  51   virtual SkColor GetBackgroundColor();
  52
  53  protected:
  54   JavaObjectWeakGlobalRef weak_java_scene_layer_;
  55   scoped_refptr<cc::Layer> layer_;
  56
  57  private:
  58   DISALLOW_COPY_AND_ASSIGN(SceneLayer);
  59 };
  60
  61 bool RegisterSceneLayer(JNIEnv* env);
  62
  63 }  // namespace android
  64 }  // namespace chrome
  65
  66 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_SCENE_LAYER_SCENE_LAYER_H_