Changes the bitmap surface GUI routines draw to.


void gui_set_screen(BITMAP *bmp);
This function can be used to change the bitmap surface the GUI routines draw to. This can be useful if you are using a double buffering or page flipping system. Passing NULL will cause the default surface (screen) to be used again. Example:
      BITMAP *page[2];

/* Allocate two pages of video memory */ page[0] = create_video_bitmap(SCREEN_W, SCREEN_H); page[1] = create_video_bitmap(SCREEN_W, SCREEN_H);

/* Page flip */ show_video_bitmap(page[0]); gui_set_screen(page[0]);
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