Grcov report - thin-lines.c

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/*

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 * Copyright © 2015 Adrian Johnson

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 * Permission to use, copy, modify, distribute, and sell this software

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 * and its documentation for any purpose is hereby granted without

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 * fee, provided that the above copyright notice appear in all copies

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 * and that both that copyright notice and this permission notice

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 * appear in supporting documentation, and that the name of

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 * Red Hat, Inc. not be used in advertising or publicity pertaining to

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 * distribution of the software without specific, written prior

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 * permission. Red Hat, Inc. makes no representations about the

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 * suitability of this software for any purpose.  It is provided "as

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 * is" without express or implied warranty.

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 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS

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 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

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 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,

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 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER

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 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

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 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR

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 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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 * Author: Adrian Johnson <ajohnson@redneon.com>

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*/

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#include "cairo-test.h"

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#define CELL_WIDTH 20

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#define CELL_HEIGHT 20

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#define PAD 2

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#define IMAGE_WIDTH (CELL_WIDTH*3 + PAD*4)

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#define IMAGE_HEIGHT (CELL_HEIGHT*4 + PAD*5)

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static void

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draw_lines(cairo_t *cr)

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    /* horizontal line */

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    cairo_translate (cr, PAD, PAD);

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    cairo_move_to (cr, 0, CELL_HEIGHT/2);

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    cairo_line_to (cr, CELL_WIDTH, CELL_HEIGHT/2);

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    cairo_stroke (cr);

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    /* vertical line */

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    cairo_translate (cr, 0, CELL_HEIGHT + PAD);

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    cairo_move_to (cr, CELL_WIDTH/2, 0);

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    cairo_line_to (cr, CELL_WIDTH/2, CELL_HEIGHT);

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    cairo_stroke (cr);

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    /* diagonal line */

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    cairo_translate (cr, 0, CELL_HEIGHT + PAD);

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    cairo_move_to (cr, 0, CELL_HEIGHT);

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    cairo_line_to (cr, CELL_WIDTH, 0);

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    cairo_stroke (cr);

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    /* curved line */

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    cairo_translate (cr, 0, CELL_HEIGHT + PAD);

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    cairo_move_to (cr, CELL_WIDTH, 0);

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    cairo_curve_to (cr, 0, 0,

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		    CELL_WIDTH, CELL_HEIGHT,

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		    0, CELL_HEIGHT);

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    cairo_stroke (cr);

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#define FIXED_POINT_MIN (1.0/256)

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static cairo_test_status_t

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draw (cairo_t *cr, int width, int height)

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    cairo_save (cr);

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    cairo_set_line_width (cr, FIXED_POINT_MIN*10.0);

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    draw_lines (cr);

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    cairo_restore (cr);

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    cairo_translate (cr, CELL_WIDTH + PAD, 0);

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    cairo_save (cr);

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    cairo_set_line_width (cr, FIXED_POINT_MIN);

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    draw_lines (cr);

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    cairo_restore (cr);

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    cairo_translate (cr, CELL_WIDTH + PAD, 0);

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    cairo_save (cr);

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    cairo_set_line_width (cr, FIXED_POINT_MIN/10.0);

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    draw_lines (cr);

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    cairo_restore (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (thin_lines,

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	    "Tests that very thin lines are output to vector surfaces",

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	    "stroke", /* keywords */

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	    NULL, /* requirements */

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	    IMAGE_WIDTH, IMAGE_HEIGHT,

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	    NULL, draw)