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
  25     // Output video plane as coordinate type.
  26     COORDINATE_TYPE_VIDEO_PLANE_RESOLUTION = 1,
  27   };
  28
  29   VideoPlane();
  30   virtual ~VideoPlane();
  31
  32   // Gets output screen resolution.
  33   virtual gfx::Size GetScreenResolution() = 0;
  34
  35   // Updates the video plane geometry.
  36   // |quad.p1()| corresponds to the top left of the original video,
  37   // |quad.p2()| to the top right of the original video,
  38   // and so on.
  39   // Depending on the underlying hardware, the exact geometry
  40   // might not be honored.
  41   // |coordinate_type| indicates what coordinate type |quad| refers to.
  42   virtual void SetGeometry(const gfx::QuadF& quad,
  43                            CoordinateType coordinate_type) = 0;
  44
  45   // Should be invoked whenever screen resolution changes (e.g. when a device is
  46   // plugged into a new HDMI port and a new HDMI EDID is received).
  47   // VideoPlane should reposition itself according to the new screen resolution.
  48   virtual void OnScreenResolutionChanged(const gfx::Size& screen_res) = 0;
  49
  50  private:
  51   DISALLOW_COPY_AND_ASSIGN(VideoPlane);
  52 };
  53
  54 // Factory to create a VideoPlane.
  55 scoped_ptr<VideoPlane> CreateVideoPlane();
  56
  57 // Global accessor to the video plane.
  58 VideoPlane* GetVideoPlane();
  59
  60 }  // namespace media
  61 }  // namespace chromecast
  62
  63 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PLANE_H_