Samsung S5PC110 Manual page 1608

S5PC110_UM
9.3.3 BLANK PIXEL
Blank pixel data in graphic layer is a pixel data that is transparent to the lower layer. You can define a blank pixel
data in the register (MIXER_GRAPHICn_BLANK) and if the graphic data is same as the blank pixel value, a lower
image is seen instead of the blank pixel.
9.3.4 SOURCE DATA IN MEMORY
As the graphic data comes from the external memory through the bus, the memory format for the source data is
dependent on the bus system endian. In little endian system, the lower 8 bits are stored in the lower address.
The source data format in the Mixer is aligned in little endian or big endian format. This different endian format is
applicable to the graphic data.
Mixer supports many graphic formats. The register format of the supported source formats is shown in
The following picture shows the pixels in a display that is seen through human eyes.
Little Endian
ARGB8888
A1 R1
63
ARGB 4444
A3 R3 G3
63
RGB 565
R3 G3
63
RGB 1555
A R3 G3
63
Big Endian
ARGB8888
A0 R0
63
ARGB 4444
A0 R0 G0
63
RGB 565
R0 G0
63
RGB 1555
A R0 G0
63
G1
47
B3 A2 R2 G2
47
B3 R2 G2
47
B3 A R2 G2
47
G0
47
B0 A1 R1 G1
47
B0 R1 G1
47
B0 A R1 G1
47
Figure 9-7
B1 A0
31
B2 A1 R1
31
B2 R1 G1
31
B2 A R1 G1
31
B0 A1
31
B1 A2 R2
31
B1 R2 G2
31
B1 A R2 G2
31
Graphic Data Format in Memory
R0 G0
15
G1 B1 A0 R0
15
B1 R0
15
B1 A R0
15
R1 G1
15
G2 B2 A3 R3
15
B2 R3
15
B2 A R3
15
9 8BMIXER
Figure 9-7.
B0
0
G0 B0
0
G0 B0
0
G0 B0
0
B1
0
G3 B3
0
G3 B3
0
G3 B3
0
9-28