Grcov report - big-trap.c

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/*

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 * Copyright © 2006 Mozilla Corporation

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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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 * 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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 * Author: Vladimir Vukicevic <vladimir@pobox.com>

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*/

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#include "cairo-test.h"

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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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 * According to Vladimir, (https://lists.freedesktop.org/archives/cairo/2006-November/008482.html):

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 *	Before the change, the two trapezoids that were generated were:

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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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 *	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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 *	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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 * 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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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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3

    cairo_set_source_rgb (cr, 1,1,1);

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3

    cairo_paint (cr);

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3

    cairo_set_source_rgb (cr, 0,0,0);

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    /* Note that without the clip, this doesn't crash... */

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3

    cairo_new_path (cr);

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3

    cairo_rectangle (cr, 0, 0, width, height);

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3

    cairo_clip (cr);

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3

    cairo_new_path (cr);

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3

    cairo_line_to (cr, 8.0, 8.0);

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3

    cairo_line_to (cr, 312.0, 8.0);

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3

    cairo_line_to (cr, 310.0, 31378756.2666666666);

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3

    cairo_line_to (cr, 10.0, 31378756.2666666666);

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3

    cairo_line_to (cr, 8.0, 8.0);

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3

    cairo_fill (cr);

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3

    return CAIRO_TEST_SUCCESS;

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/* XFAIL: range overflow of fixed-point */

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1

CAIRO_TEST (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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	    "trap", /* keywords */

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	    NULL, /* requirements */

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	    100, 100,

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	    NULL, draw)