User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
295
Bit Description
31 Select top overlay. Reserved for future implemenations
30:28 Vertical Chrominance Filter. Vertical Chrominance Filter
000 = Scaling off (1:1)
001 = Line Replication
010 = Up Interpolation
011 = Reserved
100 = Reserved
101 = Pixel Dropping
110 = Down Interpolation
111 = Reserved
27:25 Vertical Luminance Filter. Vertical Luminance Filter
000 = Scaling off (1:1)
001 = Line Replication
010 = Up Interpolation
011 = Reserved
100 = Reserved
101 = Pixel Dropping
110 = Down Interpolation
111 = Reserved
24:22 Horizontal Chrominance Filter. Horizontal Chrominance Filter
000 = Scaling off (1:1)
001 = Line Replication
010 = Up Interpolation
011 = Reserved
100 = Reserved
101 = Pixel Dropping
110 = Down Interpolation
111 = Reserved
21:19 Horizontal Luminance Filter. Horizontal Luminance Filter also applies to RGB
000 = Scaling off (1:1)
001 = Line Replication
010 = Up Interpolation
011 = Reserved
100 = Reserved
101 = Pixel Dropping
110 = Down Interpolation
111 = Reserved
18:17 Mirroring. Mirroring affects the buffer address values used. See buffer address description for details.
00 = Normal
01 = Horizontal Mirroring
10 = Vertical Mirroring
11 = Both Horizontal and vertical
16 Y adjust. Defines the range of Y and UV values in the source data. This bit is only has an effect in
YUV formats.
0 = Y 0-255 UV +-128
1 = Y 16-235 UV +-112
UV source values are always in excess 128 format