ui/gfx/display.h

   1 // Copyright (c) 2012 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_GFX_DISPLAY_H_
   6 #define UI_GFX_DISPLAY_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "ui/gfx/gfx_export.h"
  11 #include "ui/gfx/rect.h"
  12
  13 namespace gfx {
  14
  15 // This class typically, but does not always, correspond to a physical display
  16 // connected to the system. A fake Display may exist on a headless system, or a
  17 // Display may correspond to a remote, virtual display.
  18 //
  19 // Note: The screen and display currently uses pixel coordinate
  20 // system. For platforms that support DIP (density independent pixel),
  21 // |bounds()| and |work_area| will return values in DIP coordinate
  22 // system, not in backing pixels.
  23 class GFX_EXPORT Display {
  24  public:
  25   // Screen Rotation in clock-wise degrees.
  26   enum Rotation {
  27     ROTATE_0 = 0,
  28     ROTATE_90,
  29     ROTATE_180,
  30     ROTATE_270,
  31   };
  32
  33   // Touch support for the display.
  34   enum TouchSupport {
  35     TOUCH_SUPPORT_UNKNOWN,
  36     TOUCH_SUPPORT_AVAILABLE,
  37     TOUCH_SUPPORT_UNAVAILABLE,
  38   };
  39
  40   // Creates a display with kInvalidDisplayID as default.
  41   Display();
  42   explicit Display(int64 id);
  43   Display(int64 id, const Rect& bounds);
  44   ~Display();
  45
  46   // Returns the forced device scale factor, which is given by
  47   // "--force-device-scale-factor".
  48   static float GetForcedDeviceScaleFactor();
  49
  50   // Indicates if a device scale factor is being explicitly enforced from the
  51   // command line via "--force-device-scale-factor".
  52   static bool HasForceDeviceScaleFactor();
  53
  54   // Sets/Gets unique identifier associated with the display.
  55   // -1 means invalid display and it doesn't not exit.
  56   int64 id() const { return id_; }
  57   void set_id(int64 id) { id_ = id; }
  58
  59   // Gets/Sets the display's bounds in gfx::Screen's coordinates.
  60   const Rect& bounds() const { return bounds_; }
  61   void set_bounds(const Rect& bounds) { bounds_ = bounds; }
  62
  63   // Gets/Sets the display's work area in gfx::Screen's coordinates.
  64   const Rect& work_area() const { return work_area_; }
  65   void set_work_area(const Rect& work_area) { work_area_ = work_area; }
  66
  67   // Output device's pixel scale factor. This specifies how much the
  68   // UI should be scaled when the actual output has more pixels than
  69   // standard displays (which is around 100~120dpi.) The potential return
  70   // values depend on each platforms.
  71   float device_scale_factor() const { return device_scale_factor_; }
  72   void set_device_scale_factor(float scale) { device_scale_factor_ = scale; }
  73
  74   Rotation rotation() const { return rotation_; }
  75   void set_rotation(Rotation rotation) { rotation_ = rotation; }
  76
  77   TouchSupport touch_support() const { return touch_support_; }
  78   void set_touch_support(TouchSupport support) { touch_support_ = support; }
  79
  80   // Utility functions that just return the size of display and
  81   // work area.
  82   const Size& size() const { return bounds_.size(); }
  83   const Size& work_area_size() const { return work_area_.size(); }
  84
  85   // Returns the work area insets.
  86   Insets GetWorkAreaInsets() const;
  87
  88   // Sets the device scale factor and display bounds in pixel. This
  89   // updates the work are using the same insets between old bounds and
  90   // work area.
  91   void SetScaleAndBounds(float device_scale_factor,
  92                          const gfx::Rect& bounds_in_pixel);
  93
  94   // Sets the display's size. This updates the work area using the same insets
  95   // between old bounds and work area.
  96   void SetSize(const gfx::Size& size_in_pixel);
  97
  98   // Computes and updates the display's work are using
  99   // |work_area_insets| and the bounds.
 100   void UpdateWorkAreaFromInsets(const gfx::Insets& work_area_insets);
 101
 102   // Returns the display's size in pixel coordinates.
 103   gfx::Size GetSizeInPixel() const;
 104
 105   // Returns a string representation of the display;
 106   std::string ToString() const;
 107
 108   // True if the display contains valid display id.
 109   bool is_valid() const { return id_ != kInvalidDisplayID; }
 110
 111   // True if the display corresponds to internal panel.
 112   bool IsInternal() const;
 113
 114   // Gets/Sets an id of display corresponding to internal panel.
 115   static int64 InternalDisplayId();
 116   static void SetInternalDisplayId(int64 internal_display_id);
 117
 118   static const int64 kInvalidDisplayID;
 119
 120  private:
 121   int64 id_;
 122   Rect bounds_;
 123   Rect work_area_;
 124   float device_scale_factor_;
 125   Rotation rotation_;
 126   TouchSupport touch_support_;
 127 };
 128
 129 }  // namespace gfx
 130
 131 #endif  // UI_GFX_DISPLAY_H_