User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
68
This BLT operation does not use the values in the Pattern Address Register, the Source Expansion
Background Color Register, or the Source Expansion Foreground Color Register.
Figure 24. Results of Example Character Drawing BLT
63
b_blt12.vsd
0
128, 128
20080h
(128th Scan Lin
20480h
(129th Scan Lin
20880h
(130th Scan Lin
20C80h
(131th Scan Lin
21080h
(132nd Scan Li
n
21480h
(133rd Scan Lin
21880h
(134th Scan Lin
21C80h
(135th Scan Lin
Scan Lines 128 Through 135
Destination
135, 135
128, 128
Note: Drawing is not to scale
(0, 0)
(0, 767)
(1023, 0)
(1023, 767)
135, 135
The above figure shows the end result of performing this BLT operation. Only the pixels that form part
of the actual letter “f” have been drawn into the 8x8 destination location on the display, leaving the other
pixels within the destination with their original gray color.