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12cb59be7d
Found using `codespell -q 3 -I cairo-whitelist.txt` whereby whitelist contained: ``` amin iff lod writen ``` Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* Copyright © 2007 Red Hat, Inc.
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*
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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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*
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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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*
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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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*
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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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*
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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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*
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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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*
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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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*
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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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draw (cairo_t *cr, int width, int height)
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{
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/* We draw in the default black, so paint white first. */
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cairo_save (cr);
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cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
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cairo_paint (cr);
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cairo_restore (cr);
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cairo_translate (cr, PAD, PAD);
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cairo_set_line_width (cr, LINE_WIDTH);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
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cairo_save (cr);
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{
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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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}
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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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{
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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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}
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cairo_restore (cr);
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return CAIRO_TEST_SUCCESS;
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}
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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)
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