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/*
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 * Copyright 2011 Intel Corporation
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 *
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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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 *
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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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 *
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 * Author: Chris Wilson <chris@chris-wilson.co.uk>
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 */
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/* Exercises a bug spotted by Andrea Canciani where the polygon clipping

            

        

            

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 * code was hopeless broken with horizontal edges.

            

        

            

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 */

            

        

            

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#include "cairo-test.h"

            

        

            

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#define WIDTH 16

            

        

            

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#define HEIGHT 26

            

        

            

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#define BUGY 1

            

        

            

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#define BUGX (4 * BUGY * WIDTH * 256)

            

        

            

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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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{

            

        

            

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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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                3
            

            

                
    cairo_set_source_rgb (cr, 0, 0, 0);

            

        

            

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                3
            

            

                
    cairo_move_to (cr,       - BUGX, 6 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr,       + BUGX, 6 + BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr, WIDTH + BUGX, 2 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr, WIDTH - BUGX, 2 + BUGY);

            

        

            

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                3
            

            

                
    cairo_fill (cr);

            

        

            

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                3
            

            

                
    cairo_move_to (cr, WIDTH + BUGX, 8  - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr, WIDTH - BUGX, 8  + BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr,       - BUGX, 12 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr,       + BUGX, 12 + BUGY);

            

        

            

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                3
            

            

                
    cairo_fill (cr);

            

        

            

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                3
            

            

                
    cairo_move_to (cr,       - BUGX, 14 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr,       + BUGX, 14 + BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr, WIDTH + BUGX, 18 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr, WIDTH - BUGX, 18 + BUGY);

            

        

            

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                3
            

            

                
    cairo_fill (cr);

            

        

            

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                3
            

            

                
    cairo_move_to (cr, WIDTH + BUGX, 24 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr, WIDTH - BUGX, 24 + BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr,       - BUGX, 20 - BUGY);

            

        

            

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                3
            

            

                
    cairo_line_to (cr,       + BUGX, 20 + BUGY);

            

        

            

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                3
            

            

                
    cairo_fill (cr);

            

        

            

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                3
            

            

                
    return CAIRO_TEST_SUCCESS;

            

        

            

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}

            

        

            

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                1
            

            

                
CAIRO_TEST (horizontal_clip,

            

        

            

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	    "Tests intersection of a nearly horizontal lines with a clipped polygon",

            

        

            

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	    "clip, fill", /* keywords */

            

        

            

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	    NULL, /* requirements */

            

        

            

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	    WIDTH, HEIGHT,

            

        

            

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	    NULL, draw)