Provided by: allegro4-doc_4.4.2-10_all bug


       set_clip_rect - Sets the clipping rectangle of a bitmap. Allegro game programming library.


       #include <allegro.h>

       void set_clip_rect(BITMAP *bitmap, int x1, int y1, int x2, int y2);


       Each  bitmap  has an associated clipping rectangle, which is the area of the image that it
       is OK to draw onto. Nothing will be drawn to positions outside this space.  This  function
       sets the clipping rectangle for the specified bitmap. Pass the coordinates of the top-left
       and bottom-right corners  of  the  clipping  rectangle  in  this  order;  these  are  both
       inclusive,  i.e.  set_clip_rect(bitmap, 16, 16, 32, 32) will allow drawing to (16, 16) and
       (32, 32), but not to (15, 15) and (33, 33).

       Drawing operations will be performed (at least partially) on the bitmap  as  long  as  the
       first  coordinates  of  its clipping rectangle are not greater than the second coordinates
       and its intersection with the actual image  is  non-empty.  If  either  condition  is  not
       fulfilled, drawing will be turned off for the bitmap, e.g.

          set_clip_rect(bmp, 0, 0, -1, -1); /* disable drawing on bmp */

       Note  that  passing  "out-of-bitmap"  coordinates  is  allowed,  but they are likely to be
       altered (and so the coordinates returned by get_clip_rect() will be  different).  However,
       such  modifications  are  guaranteed  to  preserve  the  external  effect  of the clipping
       rectangle, that is not to modify the actual area of the image that it is OK to draw onto.


       get_clip_rect(3alleg4),          add_clip_rect(3alleg4),          set_clip_state(3alleg4),
       get_clip_state(3alleg4), ex12bit(3alleg4), excamera(3alleg4)