910GL datasheet(245/426 Pages) INTEL

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Functional Description

Datasheet

245

12.6.7

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.

12.6.7.1

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.

12.6.7.2

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).

910GL датащи(PDF) 245 Page - Intel Corporation