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324 AMD Geode™ SC3200 Processor Data Book
Video Processor Module
32581C
Figure 7-12. Color Key and Alpha Blending Logic
Color register
enabled for this
window
“Graphics
2
inside Video”
is enabled
Cursor color
key matches
graphics value
Pixel outside
the video
window
No
Ye s
Use selected cur-
sor color for pixel
No
No
Pixel value
3
matches
normal color
key
Ye s
No
Blend graphics
values and video
values using the
alpha value for
this window
Pixel value
3
matches
normal color
key
No
Use graphics
value for this pixel
Ye s
Ye s
Replace the value
with the color
register value
Ye s
Start
Notes:
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]).
Ye s
Use graphics
value for this pixel
Use video value
for this pixel
Ye s
COLOR_CHROMA
_SEL = 1
No
No
No
Ye s
Use graphics
value for this pixel
Use video value
for this pixel
No
Ye s
Ye s
No
Pixel inside
1
alpha window
COLOR_CHROMA
_SEL = 1
COLOR_CHROMA
_SEL = 1