Hello all,
I'm writing a Haskell binding to Imlib 2, and noticed some strange
behaviour in my function which manages the allocation/deallocation of
contexts. The following examples in C demonstrate the strange
behaviour I'm seeing.
The following program prints 0 1 0 2 2, and not 0 1 0 2 1 as I'd expect it to:
#include <Imlib2.h>
#include <stdio.h>
int main (void) {
Imlib_Context c1;
printf("%i ", imlib_context_get_colormap());
imlib_context_set_colormap(1);
printf("%i ", imlib_context_get_colormap());
c1 = imlib_context_new();
imlib_context_push(c1);
printf("%i ", imlib_context_get_colormap());
imlib_context_set_colormap(2);
printf("%i ", imlib_context_get_colormap());
imlib_context_pop();
imlib_context_free(c1);
printf("%i\n", imlib_context_get_colormap());
return 0;
}
Somehow, the colormap set in the pushed context doesn't get reset when
that context is popped.
Now consider the following program:
#include <Imlib2.h>
#include <stdio.h>
int main (void) {
Imlib_Context c1, c2;
// Create and then immediately throw away a context.
c2 = imlib_context_new();
imlib_context_push(c2);
imlib_context_pop();
imlib_context_free(c2);
// The rest is the same.
printf("%i ", imlib_context_get_colormap());
imlib_context_set_colormap(1);
printf("%i ", imlib_context_get_colormap());
c1 = imlib_context_new();
imlib_context_push(c1);
printf("%i ", imlib_context_get_colormap());
imlib_context_set_colormap(2);
printf("%i ", imlib_context_get_colormap());
imlib_context_pop();
imlib_context_free(c1);
printf("%i\n", imlib_context_get_colormap());
return 0;
}
One might expect that this program would print exactly the same thing
as the first, given that the only difference is that it creates,
pushes, pops and then throws away a context at the start of the
program. However, it actually behaves more in line with how I'd
expected the first program to behave. That is, it prints 0 1 0 2 1.
Doing some more experiments, it appears that the create/push/pop/free
of that new context seems to have turned the result of
imlib_context_get() from NULL into something non-null, which would
perhaps help to explain why it's happening.
Is this expected behaviour? I noticed that the context creation
functions aren't in the HTML documentation, are they meant to be used
directly like this? I would certainly prefer it if the initial context
set up by the library behaved like all the others right away.
- Cale
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