SC3200 datasheet(342/447 Pages) AMD

342 / 447 page

342

AMD Geode™ SC3200 Processor Data Book

Video Processor Module

Revision 5.1

Figure 7-12. Color Key and Alpha Blending Logic

Color register

enabled for this

window

“Graphics2

inside Video”

is enabled

Cursor color

key matches

graphics value

Pixel outside

the video

window

Yes

Use selected cur-

sor color for pixel

Pixel value3

matches

normal color

key

Yes

Blend graphics

values and video

values using the

alpha value for

this window

Pixel value3

matches

normal color

key

Use graphics

value for this pixel

Yes

Replace the value

with the color

Yes

Start

Notes:

Alpha window should not be placed outside of the video window.

“Graphics inside Video” is enabled via bit GFX_INS_VIDEO in the Video De-interlacing and Alpha Control register

(F4BAR0+Memory Offset 4Ch[8]).

The “Pixel Value” refers to either the Video value or the Graphics value, depending on the setting of bit COLOR_CHROMA_SEL

in the Display Configuration register (F4BAR0+Memory Offset 04h[20]).

Yes

Use graphics

value for this pixel

Use video value

for this pixel

Yes

COLOR_CHROMA

_SEL = 1

Yes

Use graphics

value for this pixel

Use video value

for this pixel

Yes

Pixel inside1

alpha window

COLOR_CHROMA

_SEL = 1

COLOR_CHROMA

_SEL = 1

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