Grcov report - dash-offset-negative.c

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/*

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 * Copyright © 2005 Red Hat, Inc.

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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: Owen Taylor <otaylor@redhat.com>

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*/

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#include "cairo-test.h"

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#define IMAGE_WIDTH 19

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#define IMAGE_HEIGHT 19

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/* Basic test of dashed strokes, including a test for the negative

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 * dash offset bug:

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 *	https://bugs.freedesktop.org/show_bug.cgi?id=2729

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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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3

    double dashes[] = { 1 };

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

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3

    cairo_save (cr);

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3

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

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3

    cairo_paint (cr);

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3

    cairo_restore (cr);

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3

    cairo_set_line_width (cr, 2);

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    /* Basic 1-1 dash pattern */

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3

    cairo_set_dash (cr, dashes, 1, 0.);

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3

    cairo_move_to (cr,  1, 2);

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3

    cairo_line_to (cr, 18, 2);

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3

    cairo_stroke (cr);

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    /* Adjust path by 0.5. Ideally this would give a constant 50%

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     * gray, (but does not due to the location of the regular sample

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     * grid points. */

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3

    cairo_move_to (cr, 1.5, 5);

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3

    cairo_line_to (cr, 18., 5);

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3

    cairo_stroke (cr);

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    /* Offset dash by 0.5, rather than the path */

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3

    cairo_set_dash (cr, dashes, 1, 0.5);

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3

    cairo_move_to (cr,  1, 8);

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3

    cairo_line_to (cr, 18, 8);

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3

    cairo_stroke (cr);

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    /* Now, similar tests with negative dash offsets. */

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    /* Basic 1-1 dash pattern dashing */

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3

    cairo_set_dash (cr, dashes, 1, -4);

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3

    cairo_move_to (cr,  1, 11);

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3

    cairo_line_to (cr, 18, 11);

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3

    cairo_stroke (cr);

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    /* Adjust path by 0.5 */

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3

    cairo_move_to (cr, 1.5, 14);

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3

    cairo_line_to (cr, 18., 14);

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3

    cairo_stroke (cr);

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    /* Offset dash by 0.5 */

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3

    cairo_set_dash (cr, dashes, 1, -3.5);

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3

    cairo_move_to (cr,  1, 17);

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3

    cairo_line_to (cr, 18, 17);

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    cairo_stroke (cr);

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3

    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (dash_offset_negative,

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	    "Tests cairo_set_dash with a negative offset",

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	    "dash, stroke", /* keywords */

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	    NULL, /* requirements */

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	    IMAGE_WIDTH, IMAGE_HEIGHT,

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	    NULL, draw)