38.6.4.5 Overlay Blender Attributes

When two or more video layers are used, alpha blending is performed to define the final image displayed. Each window has its own blending attributes.

CRKEY bit—Enables the chroma keying and match logic
DSTKEY bit—When written to one, destination keying is enabled
SFACTC—Source factor for the color channel blending equation
SFACTA—Source factor for the Alpha channel blending equation
DFACTC—Destination factor for the color channel blending equation
DFACTA—Destination factor
A0 field—Defines the source window alpha value 0
A1 field—Defines the source window alpha value 1

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