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Start drawing

● Drawing declaration
In SGL, when the library function “slTVOn” is executed, the drawing process on the monitor of the scroll screen is started for the first time.
After that, the scroll surface continues to draw the scroll screen in sync with the scan line according to the stored scroll information (position, scale, rotation angle, graphic data, etc.).
The function “slTVOff” is paired with this function “slTVOn”. This is to cancel the scroll drawing process.

[void slTVOn (void);]

Starts drawing processing for the scroll screen that has been set to draw.

[void slTVOff (void);]

Draws the scroll screen that has been set to draw.

● Draw Settings
Set whether to draw the scroll plane with the function settings on the monitor.
Scroll surfaces that have been registered for scrolling using the function “slScrAutoDisp” have their drawing settings turned on at the registration stage, so they are drawn as they are, but they are not drawn by turning them off It is also possible to. You can also draw a scroll surface once the drawing setting is turned off by turning on the drawing setting.

[void slScrDisp (Uint32 mode);]

Function Sets the scroll screen drawing settings.
The values ​​in the table below corresponding to the drawing settings of each scroll plane are assigned to the parameters.

Table 8-19 “slScrDisp” parameter substitution value list (mode)

Note) The values ​​in the above table are defined in “sl_def.h” included with the system.

● Screen synchronization (scroll rewriting)
The scroll drawing data is rewritten according to the scanning line status.

[void slSynch (void);]

The drawing data is rewritten while the monitor is not rewriting the screen.

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