A0 area alpha value control
0: using A0 self pixel alpha
1: using the Output image area alpha value (bit31:24)
Other: reserved
Description:
There is some area in output memory block:
The alpha / color key module is enabled:
Only the high priority image area is called A0
Only the low priority image area is called A1
The high priority and low priority mixed image area is called A2
The other area is called A3
And the A0,A1,A2 is called image area, the A3 is called non-image area.
The alpha / color key module is disabled:
Only the ROP output image area is called A0, A0 is called image area.
The other area is called A3, A3 is called non-image area.
Note: the register setting is only valid in ARGB or AYUV mode.
3.1.4.33. CSC0/1 Y/G COEFFICIENT REGISTER
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