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line-width-overlap.c
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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/*
* Copyright 2011 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Benjamin Otte <[email protected]>
*/
/*
* Test case taken from the WebKit test suite, failure originally reported
* by Zan Dobersek <[email protected]>. WebKit test is
* LayoutTests/canvas/philip/tests/2d.path.rect.selfintersect.html
*/
#include "cairo-test.h"
#include <math.h>
#define LINE_WIDTH 60
#define SIZE 100
#define RECT_SIZE 10
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
/* fill with green so RGB and RGBA tests can share the ref image */
cairo_set_source_rgb (cr, 0, 1, 0);
cairo_paint (cr);
/* red to see eventual bugs immediately */
cairo_set_source_rgb (cr, 1, 0, 0);
/* big line width */
cairo_set_line_width (cr, LINE_WIDTH);
/* rectangle that is smaller than the line width in center of image */
cairo_rectangle (cr,
(SIZE - RECT_SIZE) / 2,
(SIZE - RECT_SIZE) / 2,
RECT_SIZE,
RECT_SIZE);
cairo_stroke (cr);
return CAIRO_TEST_SUCCESS;
}
/* and again slightly offset to trigger another path */
static cairo_test_status_t
draw_offset (cairo_t *cr, int width, int height)
{
cairo_translate (cr, .5, .5);
return draw (cr, width, height);
}
static cairo_test_status_t
draw_rotated (cairo_t *cr, int width, int height)
{
cairo_translate (cr, SIZE/2, SIZE/2);
cairo_rotate (cr, M_PI/4);
cairo_translate (cr, -SIZE/2, -SIZE/2);
return draw (cr, width, height);
}
static cairo_test_status_t
draw_flipped (cairo_t *cr, int width, int height)
{
cairo_translate (cr, SIZE/2, SIZE/2);
cairo_scale (cr, -1, 1);
cairo_translate (cr, -SIZE/2, -SIZE/2);
return draw (cr, width, height);
}
static cairo_test_status_t
draw_flopped (cairo_t *cr, int width, int height)
{
cairo_translate (cr, SIZE/2, SIZE/2);
cairo_scale (cr, 1, -1);
cairo_translate (cr, -SIZE/2, -SIZE/2);
return draw (cr, width, height);
}
static cairo_test_status_t
draw_dashed (cairo_t *cr, int width, int height)
{
const double dashes[] = { 4 };
cairo_set_dash (cr, dashes, 1, 0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
return draw (cr, width, height);
}
CAIRO_TEST (line_width_overlap,
"Test overlapping lines due to large line width",
"stroke", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw)
CAIRO_TEST (line_width_overlap_offset,
"Test overlapping lines due to large line width",
"stroke", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw_offset)
CAIRO_TEST (line_width_overlap_rotated,
"Test overlapping lines due to large line width",
"stroke", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw_rotated)
CAIRO_TEST (line_width_overlap_flipped,
"Test overlapping lines due to large line width",
"stroke", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw_flipped)
CAIRO_TEST (line_width_overlap_flopped,
"Test overlapping lines due to large line width",
"stroke", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw_flopped)
CAIRO_TEST (line_width_overlap_dashed,
"Test overlapping lines due to large line width",
"stroke", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw_dashed)