get_color_depth - Returns the current pixel color depth. Allegro game
programming library.
#include <allegro.h>
int get_color_depth(void);
Returns the current pixel format. This can be very useful to know in order to
write generic functions which select a different code path internally
depending on the color depth being used.
Note that the function returns whatever value you may have set
previously with set_color_depth(), which can be different from the current
color depth of the screen global variable. If you really need to know the
color depth of the screen, use bitmap_color_depth().
set_color_depth(3), bitmap_color_depth(3), exrgbhsv(3)