Grcov report - overlapping-boxes.c

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/*

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 * Copyright © 2011 Intel Corporation

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 * Permission is hereby granted, free of charge, to any person

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 * obtaining a copy of this software and associated documentation

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 * files (the "Software"), to deal in the Software without

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 * restriction, including without limitation the rights to use, copy,

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 * modify, merge, publish, distribute, sublicense, and/or sell copies

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 * of the Software, and to permit persons to whom the Software is

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 * furnished to do so, subject to the following conditions:

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 * The above copyright notice and this permission notice shall be

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 * included in all copies or substantial portions of the Software.

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

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 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

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 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

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 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

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 * SOFTWARE.

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

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*/

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/* Not strictly overlapping, but it does highlight the error in

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 * an optimisation of fill-box handling that I frequently am

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 * tempted to write.

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*/

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#include "cairo-test.h"

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#define WIDTH		(20)

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#define HEIGHT		(20)

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static void

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border (cairo_t *cr)

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    cairo_rectangle (cr, 1, 1, 8, 8);

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    cairo_rectangle (cr, 1.25, 1.25, 7.5, 7.5);

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    cairo_rectangle (cr, 1.75, 1.75, 6.5, 6.5);

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    cairo_rectangle (cr, 2, 2, 6, 6);

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12

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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_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);

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3

    cairo_set_source_rgb (cr, 1, 1, 1);

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    cairo_paint (cr);

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    border (cr);

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    cairo_set_source_rgb (cr, 1, 0, 0);

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    cairo_set_operator (cr, CAIRO_OPERATOR_OVER);

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    cairo_fill (cr);

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    cairo_translate (cr, 10, 0);

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3

    border (cr);

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    cairo_set_source_rgb (cr, 0, 0, 1);

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3

    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);

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    cairo_fill (cr);

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3

    cairo_translate (cr, 0, 10);

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    cairo_rectangle (cr, 0, 0, 10, 10);

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3

    cairo_clip (cr);

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    border (cr);

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    cairo_set_source_rgb (cr, 0, 1, 0);

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    cairo_set_operator (cr, CAIRO_OPERATOR_IN);

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    cairo_fill (cr);

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    cairo_reset_clip (cr);

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    cairo_translate (cr, -10, 0);

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    cairo_rectangle (cr, 0, 0, 10, 10);

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    cairo_clip (cr);

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    border (cr);

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    cairo_set_source_rgb (cr, 0, 0, 1);

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    cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);

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    cairo_fill (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (overlapping_boxes,

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	    "A sub-pixel double border to highlight the danger in an easy optimisation",

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	    "fill", /* keywords */

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	    NULL, /* requirements */

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	    WIDTH, HEIGHT,

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	    NULL, draw)