Provided by: allegro5-doc_5.0.10-2_all bug


       al_create_bitmap - Allegro 5 API


              #include <allegro5/allegro.h>

              ALLEGRO_BITMAP *al_create_bitmap(int w, int h)


       Creates  a  new bitmap using the bitmap format and flags for the current thread.  Blitting
       between bitmaps of differing formats, or  blitting  between  memory  bitmaps  and  display
       bitmaps may be slow.

       Unless  you  set  the  ALLEGRO_MEMORY_BITMAP  flag,  the bitmap is created for the current
       display.  Blitting to another display may be slow.

       If a display bitmap is created, there may be limitations on the allowed  dimensions.   For
       example  a  DirectX  or  OpenGL backend usually has a maximum allowed texture size - so if
       bitmap creation fails for very large dimensions, you may want to  re-try  with  a  smaller
       bitmap.  Some platforms also dictate a minimum texture size, which is relevant if you plan
       to use this bitmap with the primitives addon.  If you try to create a bitmap smaller  than
       this, this call will not fail but the returned bitmap will be a section of a larger bitmap
       with the minimum size.  The minimum size that will work on all platforms is 32 by 32.

       Some platforms do not directly support display bitmaps whose dimensions are not powers  of
       two.  Allegro handles this by creating a larger bitmap that has dimensions that are powers
       of two and then returning a section of that bitmap  with  the  dimensions  you  requested.
       This  can  be  relevant  if  you  plan  to  use  this bitmap with the primitives addon but
       shouldn't be an issue otherwise.


       al_set_new_bitmap_format(3alleg5),                       al_set_new_bitmap_flags(3alleg5),
       al_clone_bitmap(3alleg5), al_create_sub_bitmap(3alleg5), al_destroy_bitmap(3alleg5)