| // Copyright (c) 2015 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 CHROMECAST_PUBLIC_OSD_PLANE_H_ |
| #define CHROMECAST_PUBLIC_OSD_PLANE_H_ |
| |
| namespace chromecast { |
| |
| class OsdSurface; |
| struct Rect; |
| struct Size; |
| |
| // Abstract graphics plane for OSD, to be implemented in platform-specific way. |
| // Platform must composite this plane on top of main (GL-based) graphics plane. |
| class OsdPlane { |
| public: |
| virtual ~OsdPlane() {} |
| |
| // Creates a surface for offscreen drawing. |
| virtual OsdSurface* CreateSurface(const Size& size) = 0; |
| |
| // Sets a clip rectangle, client should call before drawing to back buffer |
| // to specify the area they intend to draw on. Platforms may reduce memory |
| // usage by only allocating back buffer to cover this area. Areas outside |
| // clip rectangle must display as fully transparent. In particular, setting |
| // an empty clip rectangle and calling Flip should clear the plane. |
| virtual void SetClipRectangle(const Rect& rect) = 0; |
| |
| // Gets the current back buffer surface. Valid until next call to Flip or |
| // SetClipRectangle. |
| virtual OsdSurface* GetBackBuffer() = 0; |
| |
| // Presents current back buffer to screen. |
| virtual void Flip() = 0; |
| }; |
| |
| } // namespace chromecast |
| |
| #endif // CHROMECAST_PUBLIC_OSD_PLANE_H |