User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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15.4.8.2. DCLRKM—Destination Color Key Mask Register
Memory Address Offset: 54h (R/W)
On-chip Reg. Mem Addr Offset: 30154h (RO; debug path)
Default Value: 00h
Access: see address offset above
Size: 32 bits
31 30 29 28 24 23 0
Dest Color
Key En
Dest
Const α
Blend
Enable
Always
Const α
Blend
Enable
Reserved Destination Color Key mask
Bit Description
31 Destination Color Key Enable.
1 = destination color key is enabled
0 = destination color key is disabled
30 Destination Constant Alpha Blend Enable
1 = Enable Constant Alpha Blending between the overlay and the primary display when the Destination
Color Key does not match and Destination Color Keying is enabled within the Alpha Blend Window.
0 = Disable Constant Alpha Blending
29 Always Constant Alpha Blend Enable
1 = Enable Constant Alpha Blending within the Alpha Blend Window
0 = Disable Constant Alpha Blending
28:24 Reserved.
23:0 Destination Color Key Mask.
0 = Bits that are active participants in the compare.
1 = Bits that are active participants in the compare. A mask of all ones will disable the color key (as if
all colors match).