al_lock_bitmap_region(3)al_lock_bitmap_region(3)NAMEal_lock_bitmap_region - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
ALLEGRO_LOCKED_REGION *al_lock_bitmap_region(ALLEGRO_BITMAP *bitmap,
int x, int y, int width, int height, int format, int flags)
DESCRIPTION
Like al_lock_bitmap(3), but only locks a specific area of the bitmap.
If the bitmap is a display bitmap, only that area of the texture will
be updated when it is unlocked. Locking only the region you indend to
modify will be faster than locking the whole bitmap.
SEE ALSOALLEGRO_LOCKED_REGION(3), ALLEGRO_PIXEL_FORMAT(3), al_unlock_bitmap(3)Allegro reference manualal_lock_bitmap_region(3)