Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

12.3.19. BR18—Source Expansion Background, and Destination Color

Memory Offset Address:

 

40048h

Default:

 

 

None

Attributes:

 

RO; DWord accessible

31

24

23

0

 

 

 

Reserved. Must be Zero

 

Source Expansion Background Color Bits [23:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

Descriptions

 

 

 

31:24

Reserved. Must be Zero. Debug implementation specific [31:25] = bmnewcliplw[6:0].

 

 

 

23:0

Source Expansion Background Color Bits [23:0]. These bits provide the one, two, or three bytes

 

 

 

worth of color data that select the background color to be used in the color expansion of monochrome

 

 

 

source data during BLT operations.

This register is also used to support destination transparency mode and Solid color fill.

Whether one, two, three, or four bytes worth of color data is needed depends upon the color depth to which the BLT Engine has been set. For a color depth of 24bpp, 16bpp and 8bpp, bits [23:0], [15:0] and [7:0], respectively, are used.

12.3.20. BR19—Source Expansion Foreground Color

Memory Offset Address:

 

4004Ch

Default:

 

 

None

Attributes:

 

RO; DWord accessible

31

24

23

0

 

 

 

Reserved. Must be Zero

 

Source Expansion Foreground Color Bits [23:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

Descriptions

 

 

 

31:24

Reserved. Must be Zero. Debug implementation specific [31:26] = bmnewcliplw[12:07].

 

 

 

23:0

Pattern/Source Expansion Foreground Color Bits [23:0]. These bits provide the one, two, or three

 

 

 

bytes worth of color data that select the foreground color to be used in the color expansion of

 

 

 

monochrome source data during BLT operations.

Whether one, two, or three bytes worth of color data is needed depends upon the color depth to which the BLT Engine has been set. For a color depth of 24bpp, 16bpp and 8bpp, bits [23:0], [15:0] and [7:0], respectively, are used.

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Intel 815 manual 12.3.20. BR19-Source Expansion Foreground Color