Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

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

(0, 0)

(1023, 0)

128, 128

 

 

Note: Drawing is not to scale

63

0

 

Scan Lines 128 Through 135

20080h

 

 

(128th Scan Lin

 

 

20480h

 

 

(129th Scan Lin

 

 

20880h

 

128, 128

(130th Scan Lin

 

 

 

 

20C80h

 

 

(131th Scan Lin

 

 

21080h

 

 

(132nd Scan Lin

 

 

21480h

 

Destination

(133rd Scan Lin

 

 

21880h

 

 

(134th Scan Lin

 

135, 135

21C80h

 

(135th Scan Lin

 

 

135, 135

(0, 767)

(1023, 767)

 

 

 

b_blt12.vsd

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.

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Image 68
Intel 815 manual Results of Example Character Drawing BLT