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/*
* Copyright © 2004 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Carl D. Worth <cworth@cworth.org>
*/
/* Bug history
*
* 2004-11-04 Ned Konz <ned@squeakland.org>
*
* Reported bug on mailing list:
*
* From: Ned Konz <ned@squeakland.org>
* To: cairo@cairographics.org
* Date: Thu, 4 Nov 2004 09:49:38 -0800
* Subject: [cairo] getting assertions [cairo_cache.c:143: _entry_destroy:
* Assertion `cache->used_memory > entry->memory' failed]
*
* The attached program dies on me with the assert
*
* $ ./testCairo
* testCairo: cairo_cache.c:143: _entry_destroy: Assertion `cache->used_memory > entry->memory' failed.
*
* 2004-11-04 Carl Worth <cworth@cworth.org>
*
* I trimmed down Ned's example to the folllowing test while still
* maintaining the assertion.
*
* Oh, actually, it looks like I may have triggered something
* slightly different:
*
* text_cache_crash: cairo_cache.c:422: _cairo_cache_lookup: Assertion `cache->max_memory >= (cache->used_memory + new_entry->memory)' failed.
*
* I'll have to go back and try the original test after I fix this.
*
* 2004-11-13 Carl Worth <cworth@cworth.org>
*
* Found the bug. cairo_gstate_select_font was noticing when the
* same font was selected twice in a row and was erroneously failing
* to free the old reference. Committed a fix and verified it also
* fixed the orginal test case.
*/
#include "cairo_test.h"
cairo_test_t test = {
"text_cache_crash",
"Test case for bug causing an assertion failure in _cairo_cache_lookup",
0, 0,
};
#include <cairo.h>
static void
draw (cairo_t *cr, int width, int height)
{
/* Once there was a bug that choked when selecting the same font twice. */
cairo_select_font(cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_scale_font(cr, 40.0);
cairo_select_font(cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_scale_font(cr, 40.0);
cairo_move_to(cr, 10, 50);
cairo_show_text(cr, "hello");
/* Then there was a bug that choked when selecting a font too big
* for the cache. */
/* XXX: Sometimes this leads to an assertion:
_cairo_cache_lookup: Assertion `cache->max_memory >= (cache->used_memory + new_entry->memory)' failed.
Aborted
But other times my machine hangs completely only to return to life
several minutes later with some programs missing. This seems like
the out-of-memory killer to me.
It seems like I usually get the assertion when I run
./text_cache_crash directly and I usually get the machine hang when
I run "make check" but I don't know if there's a perfect
correlation there.
So there's a bad bug here somewhere that really needs to be fixed.
But in the meantime, I need "make check" not to destory work, so
I'm commenting this test out for now.
cairo_scale_font (cr, 500);
cairo_show_text (cr, "hello");
*/
}
int
main (void)
{
int ret;
ret = cairo_test (&test, draw);
/* It's convenient to be able to free all memory (including
* statically allocated memory). This makes it quite easy to use
* tools such as valgrind to verify that there are no memory leaks
* whatsoever.
*
* But I'm not sure what would be a sensible cairo API function
* for this. The cairo_destroy_caches call below is just something
* I made as a local modification to cairo.
*/
/*
cairo_destroy_caches ();
FcFini ();
*/
return ret;
}
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