Merge ScreenCapturerWinDirectx::frames_ and contexts_

webrtc/modules/desktop_capture/win/dxgi_frame.h

+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_FRAME_H_
+#define WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_FRAME_H_
+
+#include <memory>
+#include <vector>
+
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+#include "webrtc/modules/desktop_capture/desktop_capture_types.h"
+#include "webrtc/modules/desktop_capture/desktop_geometry.h"
+#include "webrtc/modules/desktop_capture/resolution_change_detector.h"
+#include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
+#include "webrtc/modules/desktop_capture/shared_memory.h"
+#include "webrtc/modules/desktop_capture/win/dxgi_context.h"
+
+namespace webrtc {
+
+class DxgiDuplicatorController;
+
+// A pair of a SharedDesktopFrame and a DxgiDuplicatorController::Context for
+// the client of DxgiDuplicatorController.
+class DxgiFrame final {
+ public:
+  using Context = DxgiFrameContext;
+
+  // DxgiFrame does not take ownership of |factory|, consumers should ensure it
+  // outlives this instance. nullptr is acceptable.
+  explicit DxgiFrame(SharedMemoryFactory* factory);
+  ~DxgiFrame();
+
+  // Should not be called if Prepare() is not executed or returns false.
+  SharedDesktopFrame* frame() const;
+
+ private:
+  // Allows DxgiDuplicatorController to access Prepare() and context() function
+  // as well as Context class.
+  friend class DxgiDuplicatorController;
+
+  // Prepares current instance with desktop size and source id.
+  bool Prepare(DesktopSize size, DesktopCapturer::SourceId source_id);
+
+  // Should not be called if Prepare() is not executed or returns false.
+  Context* context();
+
+  SharedMemoryFactory* const factory_;
+  ResolutionChangeDetector resolution_change_detector_;
+  DesktopCapturer::SourceId source_id_ = kFullDesktopScreenId;
+  std::unique_ptr<SharedDesktopFrame> frame_;
+  Context context_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_FRAME_H_