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Function setting 2 specific to rotary scroll screen

● Select screen over processing mode
Select the processing to be performed when drawing on the rotary scroll screen exceeds the display area. This is called screen over processing. There are four modes for screen over processing.

Mode 0: Outside the area, the image set in the display area is repeated.
Mode 1: The character pattern specified by the screen over PN register is repeated outside the area.
Mode 2: All areas outside the area are transparent.
Mode 3: The area is forcibly clipped to “0 ≦ X ≦ 512, 0 ≦ Y ≦ 512” and everything outside the area is made transparent.

Use the library function “slOverRA, RB” to select screen overprocessing.

[void slOverRA (Uint16 over_mode);]

[void slOverRB (Uint16 over_mode);]

Select the screen over process when the rotary scroll screen exceeds the display area.
For the parameter, substitute the values ​​in the table below that correspond to the screen over processing mode.
The function “slOverRA” executes the over process setting when the rotation parameter A is used, and the function “slOverRB” executes the over process setting when the rotation parameter B is used.

Table 8-17 Screen overprocessing parameter substitution value (over_mode)

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