request_scroll - Online Linux Manual PageSection : 3
Updated : version 4.4.3
Source : Allegro
Note : Allegro manual

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NAMErequest_scroll − Queues a hardware scroll request with triple buffering. Allegro game programming library.​

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SYNOPSIS#include <allegro.h> int request_scroll(int x, int y);

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DESCRIPTIONThis function is used for triple buffering. It requests a hardware scroll to the specified position, but returns immediately rather than waiting for a retrace. The scroll will then take place during the next vertical retrace, but you can carry on running other code in the meantime and use the poll_scroll() routine to detect when the flip has actually taken place. Triple buffering is only possible with certain drivers: you can look at the GFX_CAN_TRIPLE_BUFFER bit in the gfx_capabilities flag to see if it will work with the current driver.

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RETURN VALUEThis function returns zero on success, non-zero otherwise.

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SEE ALSOpoll_scroll(3), request_video_bitmap(3), gfx_capabilities(3), scroll_screen(3) 0

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