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Terms

Output resolution

The resolution on the output device. the dimensions seen on the television 1080, 720, etc. These can be set in

Device Settings -> Video Display -> Output resolution

Video planeA plane dedicated to video-only output
Graphics planeA destination for rendering. Is often used to mean a frame-buffer
ScreenThe television
Device settings library (DS)RDK Component to interact with various hardware components on the STB.  HDMI, Component, and Composite video display ports are managed via the device settings library, as is the front panel brightness. 

Graphics

Application maintains a scene graph of Guide resources and draws these resources in a back-to-front ordering. The scene graph is rendered either via OpenGL ES or DirectFB. 

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So in affect, the application drew a GUIDE in 1280x720 and it appeared perfectly scaled on a 3840x2160 TV. 

Image Added

There are a couple assumptions made at this point:

  1. The Graphics Plane is ALWAYS scaled to match the Screen Size.
  2. The Graphics Plane and the Framebuffer are of equal size. Or at least the SOC presents the Framebuffer as the size of the Graphics Plane.
  3. The Guide Plane is 1280x720 as a matter of convenience. The application is capable of rendering a UI in any arbitrary Guide Plane size.

TrueSD

When the Output Resolution is considered to be standard definition, the Guide Plane is adjusted from the default 1280x720 to 640x480 with an exception for TrueSD mode.










Table of Contents


Overview

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