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AMD Geode™ LX Processors Data Book 253
Graphics Processor
33234H
A over B 1 1-α
Α
Display image A on top of image
B. Wherever image A is transpar-
ent, display image B.
000 10
A in B α
B
0 Use image B to mask image A.
Wherever image B is non-trans-
parent, display image A.
001 00
B held out by
A
01-α
A
Use image A to mask image B.
Wherever image A is transpar-
ent, display image B.
000 01
A stop B α
B
1-α
A
Use image B to mask image A.
Display A if both images are non-
transparent, otherwise display B.
001
000
00
10
A xor B 1-α
B
1-α
A
Display images only where they
do not overlap.
001
000
01
10
darken A α
R
0 Multiply RGB channels of image
A by specified value.
(Use enables to apply to RGB.)
010 00
opaque A α
R
0 Multiply α channel of image A by
a specified value.
(Use enables to apply to alpha.)
010 00
fade A α
R
0 Multiply all channels of image A
by a specified value.
010 00
fade A
plus
fade B
α
R
1−α
R
Blend images A and B using α
R
to
specify percentage of A and B in
the resulting image.
010 11
A plus B 1 1 Add images A and B. 010 (α = 0) 10
Table 6-27. Alpha Blending Modes (Continued)
Operation Diagram
F
A
F
B
Description AS Bits OS Bits