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/horizontal-clip.c | 77 ++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 libs/cairo-1.16.0/test/horizontal-clip.c (limited to 'libs/cairo-1.16.0/test/horizontal-clip.c') diff --git a/libs/cairo-1.16.0/test/horizontal-clip.c b/libs/cairo-1.16.0/test/horizontal-clip.c new file mode 100644 index 0000000..93127a7 --- /dev/null +++ b/libs/cairo-1.16.0/test/horizontal-clip.c @@ -0,0 +1,77 @@ +/* + * Copyright 2011 Intel 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 + * Chris Wilson not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Chris Wilson makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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: Chris Wilson + */ + +/* Exercises a bug spotted by Andrea Canciani where the polygon clipping + * code was hopeless broken with horizontal edges. + */ + +#include "cairo-test.h" + +#define WIDTH 16 +#define HEIGHT 26 + +#define BUGY 1 +#define BUGX (4 * BUGY * WIDTH * 256) + +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); + + cairo_move_to (cr, - BUGX, 6 - BUGY); + cairo_line_to (cr, + BUGX, 6 + BUGY); + cairo_line_to (cr, WIDTH + BUGX, 2 - BUGY); + cairo_line_to (cr, WIDTH - BUGX, 2 + BUGY); + cairo_fill (cr); + + cairo_move_to (cr, WIDTH + BUGX, 8 - BUGY); + cairo_line_to (cr, WIDTH - BUGX, 8 + BUGY); + cairo_line_to (cr, - BUGX, 12 - BUGY); + cairo_line_to (cr, + BUGX, 12 + BUGY); + cairo_fill (cr); + + cairo_move_to (cr, - BUGX, 14 - BUGY); + cairo_line_to (cr, + BUGX, 14 + BUGY); + cairo_line_to (cr, WIDTH + BUGX, 18 - BUGY); + cairo_line_to (cr, WIDTH - BUGX, 18 + BUGY); + cairo_fill (cr); + + cairo_move_to (cr, WIDTH + BUGX, 24 - BUGY); + cairo_line_to (cr, WIDTH - BUGX, 24 + BUGY); + cairo_line_to (cr, - BUGX, 20 - BUGY); + cairo_line_to (cr, + BUGX, 20 + BUGY); + cairo_fill (cr); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (horizontal_clip, + "Tests intersection of a nearly horizontal lines with a clipped polygon", + "clip, fill", /* keywords */ + NULL, /* requirements */ + WIDTH, HEIGHT, + NULL, draw) -- cgit v1.2.1