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02804773e7
We'll need to rewrite this test (and the way cairo is compiled for testing) before it can exercise the bug of interest. In the meantime, let's just give it an "expected failure" status.
94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/*
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* Copyright © 2006 Mozilla Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Mozilla Corporation not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Mozilla Corporation makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* MOZILLA CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL MOZILLA CORPORATION BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Vladimir Vukicevic <vladimir@pobox.com>
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*/
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#include "cairo-test.h"
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static cairo_test_draw_function_t draw;
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/* This test was originally written to exercise a bug in pixman in
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* which it would scribble all over memory when given a particular
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* (and bogus) trapezoid. However, a recent change to
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* _cairo_fixed_from_double changed the details of the bogus trapezoid
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* (it overflows in a different way now), so the bug is being masked.
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*
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* According to Vladimir, (http://lists.freedesktop.org/archives/cairo/2006-November/008482.html):
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*
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* Before the change, the two trapezoids that were generated were:
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*
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* Trap[0]: T: 0x80000000 B: 0x80000003
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* L: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)]
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* R: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)]
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* Trap[1]: T: 0x80000003 B: 0x00080000
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* L: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)]
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* R: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)]
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*
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* After the change, the L/R coordinates are identical for both traps, but
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* the top and bottom change:
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*
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* Trap[0]: t: 0x80000000 b: 0xfda80003
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* l: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)]
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* r: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)]
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* Trap[1]: t: 0xfda80003 b: 0x00080000
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* l: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)]
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* r: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)]
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*
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* I think the fix we want here is to rewrite this test to call
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* directly into pixman with the trapezoid of interest, (which will
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* require adding a new way to configure cairo for "testing" which
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* will prevent the hiding of internal library symbols.
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*/
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cairo_test_t test = {
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"big-trap",
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"Test oversize trapezoid with a clip region"
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"\nTest needs to be adjusted to trigger the original bug",
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100, 100,
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draw
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};
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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/* Note that without the clip, this doesn't crash... */
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cairo_new_path (cr);
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_clip (cr);
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cairo_new_path (cr);
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cairo_line_to (cr, 8.0, 8.0);
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cairo_line_to (cr, 312.0, 8.0);
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cairo_line_to (cr, 310.0, 31378756.2666666666);
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cairo_line_to (cr, 10.0, 31378756.2666666666);
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cairo_line_to (cr, 8.0, 8.0);
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cairo_fill (cr);
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return CAIRO_TEST_SUCCESS;
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}
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int
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main (void)
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{
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return cairo_test (&test);
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}
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