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I've dithered a bit in the past about whether or not it's allowable

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to call game_set_size() twice on the same drawstate. Finally, a
definite decision: it isn't. Accordingly, midend.c arranges never to
do so, the devel docs state that puzzles may enforce by assertion
that it never happens, and the four puzzles which care (i.e. use
blitters) do so.

[originally from svn r6274]
This commit is contained in:
Simon Tatham
2005-09-05 17:18:03 +00:00
parent fd1735170e
commit 56ff3647e2
6 changed files with 21 additions and 10 deletions
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9
devel.but
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@ -1097,6 +1097,11 @@ allocating a blitter (see \k{drawing-blitter}).
The parameter \c{dr} is a drawing object (see \k{drawing}), which is
required if a blitter needs to be allocated.
Back ends may assume (and may enforce by assertion) that this
function will be called at most once for any \c{game_drawstate}. If
a puzzle needs to be redrawn at a different size, the mid-end will
create a fresh drawstate.
\S{backend-colours} \cw{colours()}
\c float *(*colours)(frontend *fe, game_state *state, int *ncolours);
@ -4115,9 +4120,7 @@ piece of saved background needs to be.
\b In the game's \cw{set_size()} function, once you know the size of
the object you'll be dragging around the display and hence the
required size of the blitter, actually allocate the blitter (making
sure to free a previous one if present \dash it's possible that
\cw{set_size()} might be called twice on the same draw state).
required size of the blitter, actually allocate the blitter.
\b In \cw{free_drawstate()}, free the blitter if it's not \cw{NULL}.