Samsung S5PC100 User Manual page 1468

MIXER
MIXER_GRAPHIC1_CFG
REG_COLOR_FORMAT1
REG_ALPHA_WIN1
NOTE: All the changes of this register are valid on a vertical sync signal of next frame.
9.9-16
Bit
Graphic layer1 color format.
0 = Reserved
1 = Reserved
2 = Reserved
3 = Reserved
4 = RGB 565
5 = ARGB 1555
6 = ARGB 4444
[11:8] 7 = ARGB 8888
8 = Reserved
9 = Reserved
A = Reserved
B = Reserved
C = Reserved
D = Reserved
E = Reserved
F = Reserved
Graphic layer1 and lower layer blending factor. This
factor is used all over the pixels in the graphic and
lower layer to blend with.
A blending factor(α) is as follows depending on the
a layer blending factor and a pixel blending factor
values:
α * graphic_layer_pixel_value + (1 – α) *
lower_layer_pixel_value
See Table 9.9-1
If REG_ALPHA_WIN1 is 0, blending_factor_layer is
0.
[7:0]
If REG_ALPHA_WIN1 is not 0,
blending_factor_layer = (REG_ALPHA_WIN + 1) /
256.
If A(blending factor of each pixel) is 0,
blending_factor_each_pixel is 0
If A(blending factor of each pixel) is not 0,
blending_factor_each_pixel = (A + 1) / 256.
The pixel blending factors comes from the pixel in
direct modes except the direct 16bpp 565 format.
S5PC100 USER'S MANUAL (REV1.0)
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