ui/display/chromeos/apply_content_protection_task.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 UI_DISPLAY_CHROMEOS_APPLY_CONTENT_PROTECTION_TASK_H_
   6 #define UI_DISPLAY_CHROMEOS_APPLY_CONTENT_PROTECTION_TASK_H_
   7
   8 #include <map>
   9 #include <vector>
  10
  11 #include "base/memory/weak_ptr.h"
  12 #include "ui/display/chromeos/display_configurator.h"
  13
  14 namespace ui {
  15
  16 class DisplayLayoutManager;
  17 class DisplaySnapshot;
  18 class NativeDisplayDelegate;
  19
  20 // In order to apply content protection the task executes in the following
  21 // manner:
  22 // 1) Run()
  23 //   a) Query NativeDisplayDelegate for HDCP state on capable displays
  24 //   b) OnHDCPStateUpdate() called for each display as response to (a)
  25 // 2) ApplyProtections()
  26 //   a) Compute preferred HDCP state for capable displays
  27 //   b) Call into NativeDisplayDelegate to set HDCP state on capable displays
  28 //   c) OnHDCPStateApplied() called for each display as reponse to (b)
  29 // 3) Call |callback_| to signal end of task.
  30 //
  31 // Note, in steps 1a and 2a, if no HDCP capable displays are found or if errors
  32 // are reported, the task finishes early and skips to step 3.
  33 class DISPLAY_EXPORT ApplyContentProtectionTask {
  34  public:
  35   typedef base::Callback<void(bool)> ResponseCallback;
  36
  37   ApplyContentProtectionTask(
  38       DisplayLayoutManager* layout_manager,
  39       NativeDisplayDelegate* native_display_delegate,
  40       const DisplayConfigurator::ContentProtections& requests,
  41       const ResponseCallback& callback);
  42   ~ApplyContentProtectionTask();
  43
  44   void Run();
  45
  46  private:
  47   // Callback to NatvieDisplayDelegate::GetHDCPState()
  48   void OnHDCPStateUpdate(int64_t display_id, bool success, HDCPState state);
  49
  50   // Callback to NativeDisplayDelegate::SetHDCPState()
  51   void OnHDCPStateApplied(bool success);
  52
  53   void ApplyProtections();
  54
  55   uint32_t GetDesiredProtectionMask(int64_t display_id) const;
  56
  57   DisplayLayoutManager* layout_manager_;  // Not owned.
  58
  59   NativeDisplayDelegate* native_display_delegate_;  // Not owned.
  60
  61   DisplayConfigurator::ContentProtections requests_;
  62
  63   // Callback used to respond once the task finishes.
  64   ResponseCallback callback_;
  65
  66   // Mapping between display IDs and the HDCP state returned by
  67   // NativeDisplayDelegate.
  68   std::map<int64_t, HDCPState> display_hdcp_state_map_;
  69
  70   // Tracks the status of the NativeDisplayDelegate responses. This will be true
  71   // if all the queries were successful, false otherwise.
  72   bool query_status_;
  73
  74   // Tracks the number of NativeDisplayDelegate requests sent but not answered
  75   // yet.
  76   size_t pending_requests_;
  77
  78   base::WeakPtrFactory<ApplyContentProtectionTask> weak_ptr_factory_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(ApplyContentProtectionTask);
  81 };
  82
  83 }  // namespace ui
  84
  85 #endif  // UI_DISPLAY_CHROMEOS_APPLY_CONTENT_PROTECTION_TASK_H_