New rule: interpret_move() is passed a pointer to the game_drawstate

basically just so that it can divide mouse coordinates by the tile
size, but is definitely not expected to _write_ to it, and it hadn't
previously occurred to me that anyone might try. Therefore,
interpret_move() now gets a pointer to a _const_ game_drawstate
instead of a writable one.

All existing puzzles cope fine with this API change (as long as the
new const qualifier is also added to a couple of subfunctions to which
interpret_move delegates work), except for the just-committed Undead,
which somehow had ds->ascii and ui->ascii the wrong way round but is
otherwise unproblematic.

[originally from svn r9657]

1 files changed, 1 insertions, 1 deletions

diff --git a/sixteen.c b/sixteen.c
index 8079fac..88c7ef4 100644
--- a/sixteen.c
+++ b/sixteen.c
@@ -595,7 +595,7 @@ struct game_drawstate {
     int cur_x, cur_y;
 };
 
-static char *interpret_move(game_state *state, game_ui *ui, game_drawstate *ds,
+static char *interpret_move(game_state *state, game_ui *ui, const game_drawstate *ds,
 			    int x, int y, int button)
 {
     int cx = -1, cy = -1, dx, dy;