301467-005 Datasheet, PDF (245/426 Pages) Intel Corporation – Express Chipset

Functional Description
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12.6.7
12.6.7.1
12.6.7.2
Planes
A plane consists of rectangular shaped image that has characteristics such as source, size,
position, method, and format. These planes get attached to source surfaces, which are rectangular
memory surfaces with a similar set of characteristics. They are also associated with a particular
destination pipe.
Cursor Plane
The cursor planes are one of the simplest display planes. With a few exceptions, the cursor plane
has a fixed size of 64x64 and a fixed Z-order (top). In legacy modes, cursor can cause the display
data below it to be inverted.
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 processor, with the graphics data on the screen.
The source data can be mirrored horizontally or vertically or both.
Source/Destination Color Keying/ChromaKeying
Overlay source/destination ChromaKeying enables blending of the overlay with the underlying
graphics background. Destination color keying/ChromaKeying can be used to handle occluded
portions of the overlay window on a pixel by pixel basis that is actually an underlay. Destination
ChromaKeying would only be used for YUV passthrough to TV. Destination color keying
supports a specific color (8- or 15-bit) mode as well as 32-bit alpha blending.
Source color keying/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.
Gamma Correction
To compensate for overlay color intensity loss due to the non-linear response between display
devices, 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.
YUV to RGB Conversion
The format conversion can be bypassed in the case of RGB source data. The format conversion
assumes that the YUV data is input in the 4:4:4 format and uses the full range scale.
Maximum Resolution and Frequency
The maximum frequency supported by the overlay logic is 180 MHz. The maximum resolution is
dependent on a number of variables (e.g., memory speed, memory latency, port selected, pipe
selected, mode definition).
Datasheet
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