remoting/host/desktop_resizer.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 REMOTING_HOST_DESKTOP_RESIZER_H_
   6 #define REMOTING_HOST_DESKTOP_RESIZER_H_
   7
   8 #include <list>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "remoting/host/screen_resolution.h"
  12
  13 namespace remoting {
  14
  15 class DesktopResizer {
  16  public:
  17   virtual ~DesktopResizer() {}
  18
  19   // Create a platform-specific DesktopResizer instance.
  20   static scoped_ptr<DesktopResizer> Create();
  21
  22   // Return the current resolution of the desktop.
  23   virtual ScreenResolution GetCurrentResolution() = 0;
  24
  25   // Get the list of supported resolutions, which should ideally include
  26   // |preferred|. Implementations will generally do one of the following:
  27   //   1. Return the list of resolutions supported by the underlying video
  28   //      driver, regardless of |preferred|.
  29   //   2. Return a list containing just |preferred|, perhaps after imposing
  30   //      some minimum size constraint. This will typically be the case if
  31   //      there are no constraints imposed by the underlying video driver.
  32   //   3. Return an empty list if resize is not supported.
  33   virtual std::list<ScreenResolution> GetSupportedResolutions(
  34       const ScreenResolution& preferred) = 0;
  35
  36   // Set the resolution of the desktop. |resolution| must be one of the
  37   // resolutions previously returned by |GetSupportedResolutions|. Note that
  38   // implementations should fail gracefully if the specified resolution is no
  39   // longer supported, since monitor configurations may change on the fly.
  40   virtual void SetResolution(const ScreenResolution& resolution) = 0;
  41
  42   // Restore the original desktop resolution. The caller must provide the
  43   // original resolution of the desktop, as returned by |GetCurrentResolution|,
  44   // as a hint. However, implementaions are free to ignore this. For example,
  45   // virtual hosts will typically ignore it to avoid unnecessary resizes.
  46   virtual void RestoreResolution(const ScreenResolution& original) = 0;
  47 };
  48
  49 }  // namespace remoting
  50
  51 #endif  // REMOTING_HOST_DESKTOP_RESIZER_H_