chromecast/media/cma/backend/video_plane.h

   1 // Copyright 2014 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 CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PLANE_H_
   6 #define CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PLANE_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10
  11 namespace gfx {
  12 class QuadF;
  13 class Size;
  14 }
  15
  16 namespace chromecast {
  17 namespace media {
  18
  19 class VideoPlane {
  20  public:
  21   enum CoordinateType {
  22     // Graphics plane as coordinate type.
  23     COORDINATE_TYPE_GRAPHICS_PLANE = 0,
  24     // Output display screen as coordinate type.
  25     COORDINATE_TYPE_SCREEN_RESOLUTION = 1,
  26   };
  27
  28   VideoPlane();
  29   virtual ~VideoPlane();
  30
  31   // Gets output screen resolution.
  32   virtual gfx::Size GetScreenResolution() = 0;
  33
  34   // Updates the video plane geometry.
  35   // |quad.p1()| corresponds to the top left of the original video,
  36   // |quad.p2()| to the top right of the original video,
  37   // and so on.
  38   // Depending on the underlying hardware, the exact geometry
  39   // might not be honored.
  40   // |coordinate_type| indicates what coordinate type |quad| refers to.
  41   virtual void SetGeometry(const gfx::QuadF& quad,
  42                            CoordinateType coordinate_type) = 0;
  43
  44   // Should be invoked whenever screen resolution changes (e.g. when a device is
  45   // plugged into a new HDMI port and a new HDMI EDID is received).
  46   // VideoPlane should reposition itself according to the new screen resolution.
  47   virtual void OnScreenResolutionChanged(const gfx::Size& screen_res) = 0;
  48
  49  private:
  50   DISALLOW_COPY_AND_ASSIGN(VideoPlane);
  51 };
  52
  53 // Factory to create a VideoPlane.
  54 scoped_ptr<VideoPlane> CreateVideoPlane();
  55
  56 // Global accessor to the video plane.
  57 VideoPlane* GetVideoPlane();
  58
  59 }  // namespace media
  60 }  // namespace chromecast
  61
  62 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PLANE_H_