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DISPLAY AREA
Region - 1 (up-scaled)
Region - 0
Region - 1 (source)
Region - 2 (source)
Region - 3
Region - 2
(down-scaled)
Region - 4
One line gap before an
up-
scaled region
Two-lines gap
before a
down
-
scaled region
No line gap
is needed
before an
un-scaled
region
Internal Modules
87
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
Figure 1-39. Region Display Position and Gap Requirement Illustration
Scaler configuration attributes (see
) are to be filled for a given scaling ratio when scaler
is enabled.
1.2.5.2.2.1.4.1 Anti-flicker Filter Implementation
When a region is scaled up or down, the poly-phase vertical filter will inherently provide anti-flicker
filtering. Even when a region is not needed to be scaled, the scaler can still be enabled to perform low-
pass filtering along the vertical direction with scaling ratio=1. Similarly, when the target display of the
GRPX is in an interlaced scan mode, the scaler can be used to perform anti-flicker filtering.
1.2.5.2.2.1.5 Stenciling
The VPDMA sends 1-bit for each pixel (from the region stenciling data buffer) of a region that has
“stenciling” feature enabled. This bit is used to force the alpha value of the pixel to ZERO in order to
“mask”-off the pixel (i.e., make the pixel transparent). This feature can be used by application to assign an
arbitrary mask shape to a rectangular region graphics. Enabling of this feature requires “stenciling_en” bit-
field to be set to `1`.