From 530ffd0b7d3c39757b20f00716e486b5caf89aff Mon Sep 17 00:00:00 2001 From: sanine Date: Wed, 12 Oct 2022 12:03:23 -0500 Subject: add cairo --- libs/cairo-1.16.0/test/big-trap.c | 92 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 libs/cairo-1.16.0/test/big-trap.c (limited to 'libs/cairo-1.16.0/test/big-trap.c') diff --git a/libs/cairo-1.16.0/test/big-trap.c b/libs/cairo-1.16.0/test/big-trap.c new file mode 100644 index 0000000..a59a38e --- /dev/null +++ b/libs/cairo-1.16.0/test/big-trap.c @@ -0,0 +1,92 @@ +/* + * Copyright © 2006 Mozilla Corporation + * + * 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 + * Mozilla Corporation not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Mozilla Corporation makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * MOZILLA CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL MOZILLA CORPORATION 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: Vladimir Vukicevic + */ + +#include "cairo-test.h" + +/* This test was originally written to exercise a bug in pixman in + * which it would scribble all over memory when given a particular + * (and bogus) trapezoid. However, a recent change to + * _cairo_fixed_from_double changed the details of the bogus trapezoid + * (it overflows in a different way now), so the bug is being masked. + * + * According to Vladimir, (https://lists.freedesktop.org/archives/cairo/2006-November/008482.html): + * + * Before the change, the two trapezoids that were generated were: + * + * Trap[0]: T: 0x80000000 B: 0x80000003 + * L: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)] + * R: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)] + * Trap[1]: T: 0x80000003 B: 0x00080000 + * L: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)] + * R: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)] + * + * After the change, the L/R coordinates are identical for both traps, but + * the top and bottom change: + * + * Trap[0]: t: 0x80000000 b: 0xfda80003 + * l: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)] + * r: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)] + * Trap[1]: t: 0xfda80003 b: 0x00080000 + * l: [(0x000a0000, 0x80000000) (0x00080000, 0x00080000)] + * r: [(0x01360000, 0x80000000) (0x01380000, 0x00080000)] + * + * I think the fix we want here is to rewrite this test to call + * directly into pixman with the trapezoid of interest, (which will + * require adding a new way to configure cairo for "testing" which + * will prevent the hiding of internal library symbols. + */ + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_set_source_rgb (cr, 1,1,1); + cairo_paint (cr); + + cairo_set_source_rgb (cr, 0,0,0); + + /* Note that without the clip, this doesn't crash... */ + cairo_new_path (cr); + cairo_rectangle (cr, 0, 0, width, height); + cairo_clip (cr); + + cairo_new_path (cr); + cairo_line_to (cr, 8.0, 8.0); + cairo_line_to (cr, 312.0, 8.0); + cairo_line_to (cr, 310.0, 31378756.2666666666); + cairo_line_to (cr, 10.0, 31378756.2666666666); + cairo_line_to (cr, 8.0, 8.0); + cairo_fill (cr); + + return CAIRO_TEST_SUCCESS; +} + +/* XFAIL: range overflow of fixed-point */ +CAIRO_TEST (big_trap, + "Test oversize trapezoid with a clip region" + "\nTest needs to be adjusted to trigger the original bug", + "trap", /* keywords */ + NULL, /* requirements */ + 100, 100, + NULL, draw) -- cgit v1.2.1