Grcov report - skew-extreme.c

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/*

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 * Copyright © 2007 Red Hat, Inc.

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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: Carl Worth <cworth@cworth.org>

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*/

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#include "cairo-test.h"

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/* This test case is designed to exercise the following bug:

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 *	Skew transforms were broken by the cairo update in December

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 *	https://bugzilla.mozilla.org/show_bug.cgi?id=373632

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 * What's happening is that the rectangle is being skewed into the

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 * following shape:

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 * a__b

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 *  \ \

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 *   \ \

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 *    \ \

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 *     \ \

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 *      \ \

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 *      d\_\c

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 * and the bug is that _cairo_traps_tessellate_convex_quad is

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 * comparing b.x as less then d.x and therefore determining that the bc

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 * edge is left of the ad edge. The fix is simply to compare c.x to

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 * d.x instead of b.x to d.x .

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*/

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#define PAD		2

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#define LINE_WIDTH	10

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#define LINE_LENGTH	(2 * LINE_WIDTH)

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#define SKEW_FACTOR	5.0

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#define WIDTH		(PAD + (LINE_LENGTH * SKEW_FACTOR) + LINE_WIDTH + PAD)

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#define HEIGHT		(PAD + LINE_WIDTH + (LINE_LENGTH * SKEW_FACTOR) + LINE_WIDTH + PAD)

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

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3

    cairo_save (cr);

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

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3

    cairo_paint (cr);

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    cairo_restore (cr);

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3

    cairo_translate (cr, PAD, PAD);

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    cairo_set_line_width (cr, LINE_WIDTH);

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3

    cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);

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    cairo_save (cr);

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	cairo_matrix_t skew_x = {

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	    1.0, 0.0,

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	    SKEW_FACTOR, 1.0,

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	    0.0, 0.0

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};

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	cairo_translate (cr, LINE_WIDTH / 2.0, 0.0);

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	cairo_transform (cr, &skew_x);

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	cairo_move_to (cr, 0.0, 0.0);

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	cairo_line_to (cr, 0.0, LINE_LENGTH);

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	cairo_stroke (cr);

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    cairo_restore (cr);

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    cairo_translate (cr, 0.0, LINE_WIDTH);

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    cairo_save (cr);

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	cairo_matrix_t skew_y = {

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	    1.0, SKEW_FACTOR,

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	    0.0, 1.0,

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	    0.0, 0.0

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};

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	cairo_translate (cr, 0.0, LINE_WIDTH / 2.0);

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	cairo_transform (cr, &skew_y);

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	cairo_move_to (cr, 0.0, 0.0);

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	cairo_line_to (cr, LINE_LENGTH, 0.0);

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	cairo_stroke (cr);

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    cairo_restore (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (skew_extreme,

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	    "Test cases of extreme skew.",

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	    "transform, stroke", /* keywords */

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	    NULL, /* requirements */

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	    WIDTH, HEIGHT,

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	    NULL, draw)