al_draw_filled_polygon_with_holes - Allegro 5 API

       Draws  a  filled  simple  polygon with zero or more other simple polygons subtracted from it - the holes.
       The holes cannot touch or intersect with the outline of the filled polygon.

       • vertices - Interleaved array of (x, y) vertex coordinates for each of the polygons, including holes.

       • vertex_counts - Number of vertices for each polygon.  The number of vertices in the filled  polygon  is
         given  by  vertex_counts[0]  and  must  be  at least three.  Subsequent elements indicate the number of
         vertices in each hole.  The array must be terminated with an element with value zero.

       • color - Color of the filled polygon

       When the y-axis is  facing  downwards  (the  usual)  the  filled  polygon  coordinates  must  be  ordered
       anti-clockwise.   All  hole  vertices  must  use  the  opposite  order (clockwise with y down).  All hole
       vertices must be inside the main polygon and no hole may overlap the main polygon.

       For example:

              float vertices[] = {
                    0,   0, // filled polygon, upper left corner
                    0, 100, // filled polygon, lower left corner
                  100, 100, // filled polygon, lower right corner
                  100,   0, // filled polygon, upper right corner
                   10,  10, // hole, upper left
                   90,  10, // hole, upper right
                   90,  90  // hole, lower right
              };
              int vertex_counts[] = {
                 4, // number of vertices for filled polygon
                 3, // number of vertices for hole
                 0  // terminator
              };

       There are 7 vertices: four for an outer square from (0, 0) to (100, 100)  in  anti-clockwise  order,  and
       three  more  for  an  inner  triangle  in  clockwise  order.  The outer main polygon uses vertices 0 to 3
       (inclusive) and the hole uses vertices 4 to 6 (inclusive).

       al_draw_filled_polygon_with_holes - Allegro 5 API

al_draw_filled_polygon(3alleg5),                              al_draw_filled_polygon_with_holes(3alleg5),
       al_triangulate_polygon(3alleg5)

Allegro reference manual                                              al_draw_filled_polygon_with_holes(3alleg5)

       5.1.0

              #include <allegro5/allegro_primitives.h>

              void al_draw_filled_polygon_with_holes(const float *vertices,
                 const int *vertex_counts, ALLEGRO_COLOR color)