Grcov report - fill-and-stroke-alpha.c

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/*

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 * Copyright © 2005 Red Hat, Inc.

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 * Copyright © 2006 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: Carl D. Worth <cworth@cworth.org>

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*/

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#include "cairo-test.h"

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#define PAD 2

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#define SIZE 10

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typedef void (*path_func_t) (cairo_t *cr);

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static void

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3

rectangle (cairo_t *cr)

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    cairo_rectangle (cr, PAD, PAD, SIZE, SIZE);

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3

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static void

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3

circle (cairo_t *cr)

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    cairo_arc (cr,

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	       PAD + SIZE / 2, PAD + SIZE / 2,

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	       SIZE / 2,

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	       0, 2 * M_PI);

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3

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/* Given a path-generating function and two opaque patterns, fill and

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 * stroke the path with the patterns (to an offscreen group), then

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 * blend the result into the destination with the given alpha

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 * value.

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*/

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static void

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fill_and_stroke_alpha (cairo_t		*cr,

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		       path_func_t	 path_func,

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		       cairo_pattern_t	*fill_pattern,

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		       cairo_pattern_t	*stroke_pattern,

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		       double		 alpha)

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    cairo_push_group (cr);

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	(path_func) (cr);

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	cairo_set_source (cr, fill_pattern);

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	cairo_fill_preserve (cr);

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	cairo_set_source (cr, stroke_pattern);

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	cairo_stroke (cr);

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    cairo_pop_group_to_source (cr);

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    cairo_paint_with_alpha (cr, alpha);

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6

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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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    cairo_pattern_t *blue;

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    cairo_pattern_t *red;

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    blue = cairo_pattern_create_rgb (0.0, 0.0, 1.0);

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3

    red = cairo_pattern_create_rgb (1.0, 0.0, 0.0);

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    cairo_test_paint_checkered (cr);

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    fill_and_stroke_alpha (cr, rectangle, blue, red, 0.5);

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    cairo_translate (cr, SIZE + 2 * PAD, 0);

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    fill_and_stroke_alpha (cr, circle, red, blue, 0.5);

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    cairo_pattern_destroy (blue);

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    cairo_pattern_destroy (red);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (fill_and_stroke_alpha,

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	    "Use a group to fill/stroke a path then blend the result with alpha onto the destination",

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	    "fill-and-stroke, fill, stroke", /* keywords */

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	    NULL, /* requirements */

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	    2 * SIZE + 4 * PAD, SIZE + 2 * PAD,

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	    NULL, draw)