Grcov report - bug-spline.c

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/* cc `pkg-config --cflags --libs cairo` cairo-spline-image.c -o cairo-spline-image */

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/* Copyright © 2005 Carl Worth

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 * Copyright © 2012 Intel Corporation

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 * Permission is hereby granted, free of charge, to any person

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 * obtaining a copy of this software and associated documentation

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 * files (the "Software"), to deal in the Software without

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 * restriction, including without limitation the rights to use, copy,

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 * modify, merge, publish, distribute, sublicense, and/or sell copies

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 * of the Software, and to permit persons to whom the Software is

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 * furnished to do so, subject to the following conditions:

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 * The above copyright notice and this permission notice shall be

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 * included in all copies or substantial portions of the Software.

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

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 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

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 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

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 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

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 * SOFTWARE.

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*/

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#include "cairo-test.h"

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#define WIDE_LINE_WIDTH 160

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#define NARROW_LINE_WIDTH 2

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/* A spline showing bugs in the "contour-based stroking" in cairo 1.12 */

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static const struct spline {

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    struct { double x, y; } pt[5];

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    double line_width;

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    double rgba[4];

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} splines[] = {

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	    { 172.25, 156.185 },

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	    { 177.225, 164.06 },

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	    { 176.5, 157.5 },

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	    { 175.5, 159.5 },

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},

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	WIDE_LINE_WIDTH,

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	{ 1, 1, 1, 1 },

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},

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	    { 571.25, 247.185 },

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	    { 78.225, 224.06 },

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	    { 129.5, 312.5 },

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	    { 210.5, 224.5 },

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},

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	NARROW_LINE_WIDTH,

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	{ 1, 0, 0, 1 },

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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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    unsigned n;

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3

    cairo_set_source_rgb (cr, 0, 0, 0);

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3

    cairo_paint (cr);

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    cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);

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    for (n = 0; n < ARRAY_LENGTH(splines); n++) {

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	cairo_set_line_width (cr, splines[n].line_width);

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	cairo_set_source_rgba (cr,

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			       splines[n].rgba[0],

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			       splines[n].rgba[1],

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			       splines[n].rgba[2],

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			       splines[n].rgba[3]);

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	cairo_move_to (cr, splines[n].pt[0].x, splines[n].pt[0].y);

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	cairo_curve_to (cr,

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			splines[n].pt[1].x, splines[n].pt[1].y,

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			splines[n].pt[2].x, splines[n].pt[2].y,

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			splines[n].pt[3].x, splines[n].pt[3].y);

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	cairo_stroke (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (bug_spline,

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	    "Exercises a bug in the stroking of splines",

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	    "spline, stroke", /* keywords */

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	    NULL, /* requirements */

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	    300, 300,

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	    NULL, draw)