native_window.h

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// Copyright 2013 The Flutter 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 FLUTTER_IMPELLER_TOOLKIT_ANDROID_NATIVE_WINDOW_H_
#define FLUTTER_IMPELLER_TOOLKIT_ANDROID_NATIVE_WINDOW_H_
 
#include "flutter/fml/unique_object.h"
#include "impeller/geometry/size.h"
#include "impeller/toolkit/android/proc_table.h"
 
namespace impeller::android {
 
//------------------------------------------------------------------------------
/// @brief      A wrapper for ANativeWindow
///             https://developer.android.com/ndk/reference/group/a-native-window
///
///             This wrapper is only available on Android.
///
class NativeWindow {
 public:
  explicit NativeWindow(ANativeWindow* window);
 
  ~NativeWindow();
 
  NativeWindow(const NativeWindow&) = delete;
 
  NativeWindow& operator=(const NativeWindow&) = delete;
 
  bool IsValid() const;
 
  //----------------------------------------------------------------------------
  /// @return     The current size of the native window.
  ///
  ISize GetSize() const;
 
  ANativeWindow* GetHandle() const;
 
 private:
  struct UniqueANativeWindowTraits {
    static ANativeWindow* InvalidValue() { return nullptr; }
 
    static bool IsValid(ANativeWindow* value) {
      return value != InvalidValue();
    }
 
    static void Free(ANativeWindow* value) {
      GetProcTable().ANativeWindow_release(value);
    }
  };
 
  fml::UniqueObject<ANativeWindow*, UniqueANativeWindowTraits> window_;
};
 
}  // namespace impeller::android
 
#endif  // FLUTTER_IMPELLER_TOOLKIT_ANDROID_NATIVE_WINDOW_H_