Grcov report - caps-tails-curve.c

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/*

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 * Copyright © 2011 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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 * Author: Chris Wilson <chris@chris-wilson.co.uk>

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*/

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#include "cairo-test.h"

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#define LINE_WIDTH	30.

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#define SIZE		(2 * LINE_WIDTH)

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#define PAD		(2 * LINE_WIDTH)

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static void

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make_path (cairo_t *cr, double theta)

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    double line_width = cairo_get_line_width (cr) / 4;

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    cairo_move_to (cr, 0, 0);

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    cairo_rel_curve_to (cr,

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			SIZE/3, -SIZE/4,

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			SIZE/3, -SIZE/4,

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			SIZE, 0);

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    cairo_rel_line_to (cr,

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		       cos (theta) * line_width,

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		       sin (theta) * line_width);

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static void

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draw_joins (cairo_t *cr, double theta)

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    make_path (cr, theta);

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    cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);

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    cairo_stroke (cr);

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    cairo_translate (cr, SIZE + PAD, 0.);

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    make_path (cr, theta);

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    cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);

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    cairo_stroke (cr);

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    cairo_translate (cr, SIZE + PAD, 0.);

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    make_path (cr, theta);

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    cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);

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    cairo_stroke (cr);

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    cairo_translate (cr, SIZE + PAD, 0.);

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static void

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draw_caps_joins (cairo_t *cr, double theta)

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    cairo_translate (cr, PAD, 0);

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    cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);

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    draw_joins (cr, theta);

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    cairo_translate (cr, PAD, 0);

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    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);

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    draw_joins (cr, theta);

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    cairo_translate (cr, PAD, 0);

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    cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);

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    draw_joins (cr, theta);

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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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    const double theta[] = {

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	-M_PI/2, -M_PI/4, 0, M_PI/8, M_PI/3, M_PI

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};

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    unsigned int t;

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    /* We draw in the default black, so paint white first. */

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    cairo_save (cr);

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    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */

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    cairo_paint (cr);

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    cairo_restore (cr);

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    cairo_set_line_width (cr, LINE_WIDTH);

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    for (t = 0; t < ARRAY_LENGTH(theta); t++) {

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	cairo_save (cr);

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	cairo_translate (cr, 0, t * (SIZE + PAD) + PAD);

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	draw_caps_joins (cr, theta[t]);

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	cairo_restore (cr);

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	cairo_save (cr);

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	/* and reflect to generate the opposite vertex ordering */

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	cairo_translate (cr, 0, height - t * (SIZE + PAD) - PAD);

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	cairo_scale (cr, 1, -1);

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	draw_caps_joins (cr, theta[t]);

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	cairo_restore (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (caps_tails_curve,

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	    "Test caps and joins on short tail segments",

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	    "stroke, cap, join", /* keywords */

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	    NULL, /* requirements */

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	    9 * (PAD + SIZE) + 4*PAD,

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	    12 * (PAD + SIZE) + PAD,

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	    NULL, draw)

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