Grcov report - fill-alpha.c

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/*

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 * Copyright © 2008 Chris Wilson

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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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 * Chris Wilson 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. Chris Wilson 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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 * CHRIS WILSON 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 CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>

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*/

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#include "cairo-test.h"

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#define SIZE 60 /* needs to be big to check large area effects (dithering) */

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#define PAD 2

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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

    const double alpha = 1./3;

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    int n;

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    /* flatten to white */

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3

    cairo_set_source_rgb (cr, 1, 1, 1);

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3

    cairo_paint (cr);

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    /* square */

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3

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

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3

    cairo_set_source_rgba (cr, 1, 0, 0, alpha);

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3

    cairo_fill (cr);

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    /* circle */

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3

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

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3

    cairo_arc (cr, PAD + SIZE / 2., PAD + SIZE / 2., SIZE / 2., 0, 2 * M_PI);

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3

    cairo_set_source_rgba (cr, 0, 1, 0, alpha);

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3

    cairo_fill (cr);

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    /* triangle */

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3

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

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3

    cairo_move_to (cr, PAD + SIZE / 2, PAD);

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3

    cairo_line_to (cr, PAD + SIZE, PAD + SIZE);

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3

    cairo_line_to (cr, PAD, PAD + SIZE);

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3

    cairo_set_source_rgba (cr, 0, 0, 1, alpha);

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3

    cairo_fill (cr);

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    /* star */

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3

    cairo_translate (cr, -(SIZE + 2 * PAD) + SIZE/2., SIZE/2.);

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    for (n = 0; n < 5; n++) {

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	cairo_line_to (cr,

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		       SIZE/2 * cos (2*n * 2*M_PI / 10),

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		       SIZE/2 * sin (2*n * 2*M_PI / 10));

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	cairo_line_to (cr,

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		       SIZE/4 * cos ((2*n+1)*2*M_PI / 10),

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		       SIZE/4 * sin ((2*n+1)*2*M_PI / 10));

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3

    cairo_set_source_rgba (cr, 0, 0, 0, alpha);

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3

    cairo_fill (cr);

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3

    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (fill_alpha,

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	    "Tests using set_rgba();fill()",

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	    "fill, alpha", /* keywords */

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	    NULL, /* requirements */

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

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	    NULL, draw)