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Functional Description
D15343-003 135
6.4.6.1 Cursor Color Formats
Color data can be in an indexed format or a true color format. Indexed data uses the entries in the
four-entry cursor palette to convert the two-bit index to a true color format before being passed to
the blenders. The index can optionally specify that a cursor pixel be transparent or cause an
inversion of the pixel value below it or one of two colors from the cursor palette. Blending of YUV
or RGB data is only supported with planes that have data of the same format.
6.4.6.2 Popup Plane (Second Cursor)
The popup plane is used for control functions in mobile applications. Only the hardware cursor has
a higher Z-order precedence over the hardware icon. In standard modes (non-VGA) either cursor A
or cursor B can be used as a Popup Icon. For VGA modes, 32-bpp data format is not supported.
6.4.6.3 Popup Color Formats
Source color data for the popup is in an indexed format. Indexed data uses the entries in the four-
entry cursor palette to convert the two-bit index to a true color format before being passed to the
blenders. Blending of color data is only supported with data of the same format.
6.4.7 Overlay Plane
The overlay engine provides a method of merging either video capture data (from an external
Video Capture device) or data delivered by the CPU, with the graphics data on the screen.
6.4.7.1 Multiple Overlays (Display C)
A single overlay plane and scalar is implemented. This overlay plane can be connected to the
primary display, secondary display or in bypass mode. In the default mode, it appears on the
primary display. The overlay may be displayed in a multi-monitor scenario for single-pipe
simultaneous displays only. Picture-in-Picture feature is supported via software through the
arithmetic stretch BLT.
6.4.7.2 Source/Destination Color/Chromakeying
Overlay source/destination chromakeying enables blending of the overlay with the underlying
graphics background. Destination color-/chromakeying can be used to handle occluded portions of
the overlay window on a pixel-by-pixel basis that is actually an underlay. Destination color keying
supports a specific color (8-bit or 15-bit) mode as well as 32-bit alpha blending.
Source color/chromakeying is used to handle transparency based on the overlay window on a
pixel-by-pixel basis. This is used when "blue screening" an image to overlay the image on a new
background later.
6.4.7.3 Gamma Correction
To compensate for overlay color intensity loss, the overlay engine supports independent gamma
correction. This allows the overlay data to be converted to linear data or corrected for the display
device when not blending.
6.4.7.4 YUV to RGB Conversion
The format conversion can be bypassed in the case of RGB source data.