32579B

Video Processor Module

 

 

Start

Use selected cur-

 

Yes

Cursor color

sor color for pixel

 

 

key matches

 

 

 

 

graphics value

 

 

 

 

 

Yes

 

No

 

 

 

 

 

 

 

 

Pixel outside

Use graphics

 

value for this pixel

 

 

the video

 

 

 

 

 

window

 

 

 

 

No

 

 

 

 

Blend graphics

values and video values using the alpha value for this window

 

Pixel inside

1

No

“Graphics2

 

 

inside Video”

 

alpha window

 

 

 

 

 

is enabled

 

 

 

 

 

 

 

Yes

 

 

 

No

 

 

 

 

No

Pixel value3

 

Pixel value3

matches

 

 

matches

 

 

 

 

 

 

 

normal color

 

normal color

 

key

 

 

key

 

 

Yes

 

 

 

No

 

 

 

 

Yes

Yes

Replace the value with the color register value

Yes

Color register

COLOR_CHROMA

 

 

COLOR_CHROMA

Yes

 

enabled for this

 

 

 

 

 

_SEL = 1

 

 

_SEL = 1

 

 

 

window

Yes

 

 

 

 

 

 

 

 

 

No

No

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COLOR_CHROMA

_SEL = 1

Yes

Notes:

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

Use video value

 

Use graphics

 

Use video value

 

Use graphics

for this pixel

 

value for this pixel

 

for this pixel

 

value for this pixel

 

 

 

 

 

 

 

 

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

2)“Graphics inside Video” is enabled via bit GFX_INS_VIDEO in the Video De-interlacing and Alpha Control register (F4BAR0+Memory Offset 4Ch[8]).

3)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]).

Figure 7-12. Color Key and Alpha Blending Logic

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AMD Geode™ SC1200/SC1201 Processor Data Book

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AMD SC1200, SC1201 manual 328