Move chromeos/display/* to ui/display/chromeos

chromeos/display/output_configurator.h

-// Copyright (c) 2012 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 CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
-#define CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
-
-#include <map>
-#include <string>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/event_types.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/observer_list.h"
-#include "base/timer/timer.h"
-#include "chromeos/chromeos_export.h"
-#include "chromeos/display/native_display_observer.h"
-#include "third_party/cros_system_api/dbus/service_constants.h"
-#include "ui/display/display_constants.h"
-
-// Forward declarations for Xlib and Xrandr.
-// This is so unused X definitions don't pollute the namespace.
-typedef unsigned long XID;
-typedef XID RROutput;
-typedef XID RRCrtc;
-typedef XID RRMode;
-
-namespace chromeos {
-
-class NativeDisplayDelegate;
-
-// This class interacts directly with the underlying Xrandr API to manipulate
-// CTRCs and Outputs.
-class CHROMEOS_EXPORT OutputConfigurator
-    : public NativeDisplayObserver {
- public:
-  typedef uint64_t OutputProtectionClientId;
-  static const OutputProtectionClientId kInvalidClientId = 0;
-
-  struct ModeInfo {
-    ModeInfo();
-    ModeInfo(int width, int height, bool interlaced, float refresh_rate);
-
-    int width;
-    int height;
-    bool interlaced;
-    float refresh_rate;
-  };
-
-  typedef std::map<RRMode, ModeInfo> ModeInfoMap;
-
-  struct CoordinateTransformation {
-    // Initialized to the identity transformation.
-    CoordinateTransformation();
-
-    float x_scale;
-    float x_offset;
-    float y_scale;
-    float y_offset;
-  };
-
-  // Information about an output's current state.
-  struct OutputSnapshot {
-    OutputSnapshot();
-    ~OutputSnapshot();
-
-    RROutput output;
-
-    // CRTC that should be used for this output. Not necessarily the CRTC
-    // that XRandR reports is currently being used.
-    RRCrtc crtc;
-
-    // Mode currently being used by the output.
-    RRMode current_mode;
-
-    // "Best" mode supported by the output.
-    RRMode native_mode;
-
-    // Mode used when displaying the same desktop on multiple outputs.
-    RRMode mirror_mode;
-
-    // User-selected mode for the output.
-    RRMode selected_mode;
-
-    // Output's origin on the framebuffer.
-    int x;
-    int y;
-
-    // Output's physical dimensions.
-    uint64 width_mm;
-    uint64 height_mm;
-
-    bool is_aspect_preserving_scaling;
-
-    // The type of output.
-    ui::OutputType type;
-
-    // Map from mode IDs to details about the corresponding modes.
-    ModeInfoMap mode_infos;
-
-    // XInput device ID or 0 if this output isn't a touchscreen.
-    int touch_device_id;
-
-    CoordinateTransformation transform;
-
-    // Display id for this output.
-    int64 display_id;
-
-    bool has_display_id;
-
-    // This output's index in the array returned by XRandR. Stable even as
-    // outputs are connected or disconnected.
-    int index;
-  };
-
-  class Observer {
-   public:
-    virtual ~Observer() {}
-
-    // Called after the display mode has been changed. |output| contains the
-    // just-applied configuration. Note that the X server is no longer grabbed
-    // when this method is called, so the actual configuration could've changed
-    // already.
-    virtual void OnDisplayModeChanged(
-        const std::vector<OutputSnapshot>& outputs) {}
-
-    // Called after a display mode change attempt failed. |failed_new_state| is
-    // the new state which the system failed to enter.
-    virtual void OnDisplayModeChangeFailed(ui::OutputState failed_new_state) {}
-  };
-
-  // Interface for classes that make decisions about which output state
-  // should be used.
-  class StateController {
-   public:
-    virtual ~StateController() {}
-
-    // Called when displays are detected.
-    virtual ui::OutputState GetStateForDisplayIds(
-        const std::vector<int64>& display_ids) const = 0;
-
-    // Queries the resolution (|width|x|height|) in pixels
-    // to select output mode for the given display id.
-    virtual bool GetResolutionForDisplayId(int64 display_id,
-                                           int* width,
-                                           int* height) const = 0;
-  };
-
-  // Interface for classes that implement software based mirroring.
-  class SoftwareMirroringController {
-   public:
-    virtual ~SoftwareMirroringController() {}
-
-    // Called when the hardware mirroring failed.
-    virtual void SetSoftwareMirroring(bool enabled) = 0;
-  };
-
-  class TouchscreenDelegate {
-   public:
-    virtual ~TouchscreenDelegate() {}
-
-    // Searches for touchscreens among input devices,
-    // and tries to match them up to screens in |outputs|.
-    // |outputs| is an array of detected screens.
-    // If a touchscreen with same resolution as an output's native mode
-    // is detected, its id will be stored in this output.
-    virtual void AssociateTouchscreens(
-        std::vector<OutputSnapshot>* outputs) = 0;
-
-    // Configures XInput's Coordinate Transformation Matrix property.
-    // |touch_device_id| the ID of the touchscreen device to configure.
-    // |ctm| contains the desired transformation parameters.  The offsets
-    // in it should be normalized so that 1 corresponds to the X or Y axis
-    // size for the corresponding offset.
-    virtual void ConfigureCTM(int touch_device_id,
-                              const CoordinateTransformation& ctm) = 0;
-  };
-
-  // Helper class used by tests.
-  class TestApi {
-   public:
-    TestApi(OutputConfigurator* configurator)
-        : configurator_(configurator) {}
-    ~TestApi() {}
-
-    // If |configure_timer_| is started, stops the timer, runs
-    // ConfigureOutputs(), and returns true; returns false otherwise.
-    bool TriggerConfigureTimeout();
-
-   private:
-    OutputConfigurator* configurator_;  // not owned
-
-    DISALLOW_COPY_AND_ASSIGN(TestApi);
-  };
-
-  // Flags that can be passed to SetDisplayPower().
-  static const int kSetDisplayPowerNoFlags                     = 0;
-  // Configure displays even if the passed-in state matches |power_state_|.
-  static const int kSetDisplayPowerForceProbe                  = 1 << 0;
-  // Do not change the state if multiple displays are connected or if the
-  // only connected display is external.
-  static const int kSetDisplayPowerOnlyIfSingleInternalDisplay = 1 << 1;
-
-  // Gap between screens so cursor at bottom of active display doesn't
-  // partially appear on top of inactive display. Higher numbers guard
-  // against larger cursors, but also waste more memory.
-  // For simplicity, this is hard-coded to avoid the complexity of always
-  // determining the DPI of the screen and rationalizing which screen we
-  // need to use for the DPI calculation.
-  // See crbug.com/130188 for initial discussion.
-  static const int kVerticalGap = 60;
-
-  // Returns a pointer to the ModeInfo struct in |output| corresponding to
-  // |mode|, or NULL if the struct isn't present.
-  static const ModeInfo* GetModeInfo(const OutputSnapshot& output,
-                                     RRMode mode);
-
-  // Returns the mode within |output| that matches the given size with highest
-  // refresh rate. Returns None if no matching output was found.
-  static RRMode FindOutputModeMatchingSize(const OutputSnapshot& output,
-                                           int width,
-                                           int height);
-
-  OutputConfigurator();
-  virtual ~OutputConfigurator();
-
-  ui::OutputState output_state() const { return output_state_; }
-  DisplayPowerState power_state() const { return power_state_; }
-  const std::vector<OutputSnapshot>& cached_outputs() const {
-    return cached_outputs_;
-  }
-
-  void set_state_controller(StateController* controller) {
-    state_controller_ = controller;
-  }
-  void set_mirroring_controller(SoftwareMirroringController* controller) {
-    mirroring_controller_ = controller;
-  }
-
-  // Replaces |native_display_delegate_| with |delegate| and sets
-  // |configure_display_| to true.  Should be called before Init().
-  void SetNativeDisplayDelegateForTesting(
-      scoped_ptr<NativeDisplayDelegate> delegate);
-
-  void SetTouchscreenDelegateForTesting(
-      scoped_ptr<TouchscreenDelegate> delegate);
-
-  // Sets the initial value of |power_state_|.  Must be called before Start().
-  void SetInitialDisplayPower(DisplayPowerState power_state);
-
-  // Initialization, must be called right after constructor.
-  // |is_panel_fitting_enabled| indicates hardware panel fitting support.
-  void Init(bool is_panel_fitting_enabled);
-
-  // Does initial configuration of displays during startup.
-  // If |background_color_argb| is non zero and there are multiple displays,
-  // OutputConfigurator sets the background color of X's RootWindow to this
-  // color.
-  void ForceInitialConfigure(uint32 background_color_argb);
-
-  // Stop handling display configuration events/requests.
-  void PrepareForExit();
-
-  // Called when powerd notifies us that some set of displays should be turned
-  // on or off.  This requires enabling or disabling the CRTC associated with
-  // the display(s) in question so that the low power state is engaged.
-  // |flags| contains bitwise-or-ed kSetDisplayPower* values.
-  bool SetDisplayPower(DisplayPowerState power_state, int flags);
-
-  // Force switching the display mode to |new_state|. Returns false if
-  // switching failed (possibly because |new_state| is invalid for the
-  // current set of connected outputs).
-  bool SetDisplayMode(ui::OutputState new_state);
-
-  // NativeDisplayDelegate::Observer overrides:
-  virtual void OnConfigurationChanged() OVERRIDE;
-
-  void AddObserver(Observer* observer);
-  void RemoveObserver(Observer* observer);
-
-  // Sets all the displays into pre-suspend mode; usually this means
-  // configure them for their resume state. This allows faster resume on
-  // machines where display configuration is slow.
-  void SuspendDisplays();
-
-  // Reprobes displays to handle changes made while the system was
-  // suspended.
-  void ResumeDisplays();
-
-  const std::map<int, float>& GetMirroredDisplayAreaRatioMap() {
-    return mirrored_display_area_ratio_map_;
-  }
-
-  // Registers a client for output protection and requests a client id. Returns
-  // 0 if requesting failed.
-  OutputProtectionClientId RegisterOutputProtectionClient();
-
-  // Unregisters the client.
-  void UnregisterOutputProtectionClient(OutputProtectionClientId client_id);
-
-  // Queries link status and protection status.
-  // |link_mask| is the type of connected output links, which is a bitmask of
-  // OutputType values. |protection_mask| is the desired protection methods,
-  // which is a bitmask of the OutputProtectionMethod values.
-  // Returns true on success.
-  bool QueryOutputProtectionStatus(
-      OutputProtectionClientId client_id,
-      int64 display_id,
-      uint32_t* link_mask,
-      uint32_t* protection_mask);
-
-  // Requests the desired protection methods.
-  // |protection_mask| is the desired protection methods, which is a bitmask
-  // of the OutputProtectionMethod values.
-  // Returns true when the protection request has been made.
-  bool EnableOutputProtection(
-      OutputProtectionClientId client_id,
-      int64 display_id,
-      uint32_t desired_protection_mask);
-
- private:
-  // Mapping a display_id to a protection request bitmask.
-  typedef std::map<int64, uint32_t> DisplayProtections;
-  // Mapping a client to its protection request.
-  typedef std::map<OutputProtectionClientId,
-                   DisplayProtections> ProtectionRequests;
-
-  // Updates |cached_outputs_| to contain currently-connected outputs. Calls
-  // |delegate_->GetOutputs()| and then does additional work, like finding the
-  // mirror mode and setting user-preferred modes. Note that the server must be
-  // grabbed via |delegate_->GrabServer()| first.
-  void UpdateCachedOutputs();
-
-  // Helper method for UpdateCachedOutputs() that initializes the passed-in
-  // outputs' |mirror_mode| fields by looking for a mode in |internal_output|
-  // and |external_output| having the same resolution. Returns false if a shared
-  // mode wasn't found or created.
-  //
-  // |try_panel_fitting| allows creating a panel-fitting mode for
-  // |internal_output| instead of only searching for a matching mode (note that
-  // it may lead to a crash if |internal_info| is not capable of panel fitting).
-  //
-  // |preserve_aspect| limits the search/creation only to the modes having the
-  // native aspect ratio of |external_output|.
-  bool FindMirrorMode(OutputSnapshot* internal_output,
-                      OutputSnapshot* external_output,
-                      bool try_panel_fitting,
-                      bool preserve_aspect);
-
-  // Configures outputs.
-  void ConfigureOutputs();
-
-  // Notifies observers about an attempted state change.
-  void NotifyObservers(bool success, ui::OutputState attempted_state);
-
-  // Switches to the state specified in |output_state| and |power_state|.
-  // If the hardware mirroring failed and |mirroring_controller_| is set,
-  // it switches to |STATE_DUAL_EXTENDED| and calls |SetSoftwareMirroring()|
-  // to enable software based mirroring.
-  // On success, updates |output_state_|, |power_state_|, and |cached_outputs_|
-  // and returns true.
-  bool EnterStateOrFallBackToSoftwareMirroring(ui::OutputState output_state,
-                                               DisplayPowerState power_state);
-
-  // Switches to the state specified in |output_state| and |power_state|.
-  // On success, updates |output_state_|, |power_state_|, and
-  // |cached_outputs_| and returns true.
-  bool EnterState(ui::OutputState output_state, DisplayPowerState power_state);
-
-  // Returns the output state that should be used with |cached_outputs_| while
-  // in |power_state|.
-  ui::OutputState ChooseOutputState(DisplayPowerState power_state) const;
-
-  // Computes the relevant transformation for mirror mode.
-  // |output| is the output on which mirror mode is being applied.
-  // Returns the transformation or identity if computations fail.
-  CoordinateTransformation GetMirrorModeCTM(
-      const OutputConfigurator::OutputSnapshot& output);
-
-  // Computes the relevant transformation for extended mode.
-  // |output| is the output on which extended mode is being applied.
-  // |width| and |height| are the width and height of the combined framebuffer.
-  // Returns the transformation or identity if computations fail.
-  CoordinateTransformation GetExtendedModeCTM(
-      const OutputConfigurator::OutputSnapshot& output,
-      int framebuffer_width,
-      int frame_buffer_height);
-
-  // Returns the ratio between mirrored mode area and native mode area:
-  // (mirror_mode_width * mirrow_mode_height) / (native_width * native_height)
-  float GetMirroredDisplayAreaRatio(
-      const OutputConfigurator::OutputSnapshot& output);
-
-  // Applies output protections according to requests.
-  bool ApplyProtections(const DisplayProtections& requests);
-
-  StateController* state_controller_;
-  SoftwareMirroringController* mirroring_controller_;
-  scoped_ptr<NativeDisplayDelegate> native_display_delegate_;
-  scoped_ptr<TouchscreenDelegate> touchscreen_delegate_;
-
-  // Used to enable modes which rely on panel fitting.
-  bool is_panel_fitting_enabled_;
-
-  // Key of the map is the touch display's id, and the value of the map is the
-  // touch display's area ratio in mirror mode defined as :
-  // mirror_mode_area / native_mode_area.
-  // This is used for scaling touch event's radius when the touch display is in
-  // mirror mode :
-  // new_touch_radius = sqrt(area_ratio) * old_touch_radius
-  std::map<int, float> mirrored_display_area_ratio_map_;
-
-  // This is detected by the constructor to determine whether or not we should
-  // be enabled.  If we aren't running on ChromeOS, we can't assume that the
-  // Xrandr X11 extension is supported.
-  // If this flag is set to false, any attempts to change the output
-  // configuration to immediately fail without changing the state.
-  bool configure_display_;
-
-  // The current display state.
-  ui::OutputState output_state_;
-
-  // The current power state.
-  DisplayPowerState power_state_;
-
-  // Most-recently-used output configuration. Note that the actual
-  // configuration changes asynchronously.
-  std::vector<OutputSnapshot> cached_outputs_;
-
-  ObserverList<Observer> observers_;
-
-  // The timer to delay configuring outputs. See also the comments in
-  // Dispatch().
-  scoped_ptr<base::OneShotTimer<OutputConfigurator> > configure_timer_;
-
-  // Id for next output protection client.
-  OutputProtectionClientId next_output_protection_client_id_;
-
-  // Output protection requests of each client.
-  ProtectionRequests client_protection_requests_;
-
-  DISALLOW_COPY_AND_ASSIGN(OutputConfigurator);
-};
-
-typedef std::vector<OutputConfigurator::OutputSnapshot> OutputSnapshotList;
-
-}  // namespace chromeos
-
-#endif  // CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_