[AD] Why aren't BITMAP * parameters const where appropriate?

[Daniel Schlyder <daniel@xxxxxxxxxx>]

Is there any reason why bitmap_color_depth()'s parameter couldn't be made
const? And ditto for stretch_bitmap()'s 'source' parameter? And probably
lots of other functions' parameters too. The lack of const'ness means I have
to use const_cast in my C++ program to squelch warnings from GCC.

--
Daniel Schlyder
http://bitblaze.com/