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test: Add radial-outer-focus

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Numerical instability in the computation of gradients leads to random
results.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=40918
This commit is contained in:
Krzysztof Kosinski 2011-09-16 15:59:38 +01:00 • committed by Chris Wilson
parent 26e8fa03cb
commit f09361cff1
2 changed files with 70 additions and 0 deletions
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1
test/Makefile.sources
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@ -234,6 +234,7 @@ test_sources = \
push-group-path-offset.c \
radial-gradient.c \
radial-gradient-extend.c \
radial-outer-focus.c \
random-clips.c \
random-intersections-eo.c \
random-intersections-nonzero.c \

69
test/radial-outer-focus.c Normal file
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@ -0,0 +1,69 @@
/*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Krzysztof Kosi\u0144ski <tweenk.pl@gmail.com>
*/
/* Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=40918 */
#include "cairo-test.h"
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_pattern_t *radial;
double angle;
int i, j;
angle = 0.0;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
cairo_save (cr);
cairo_rectangle (cr, 100*i, 100*j, 100, 100);
cairo_clip (cr);
radial = cairo_pattern_create_radial (cos (angle), sin (angle), 0,
0, 0, 1);
cairo_pattern_add_color_stop_rgb (radial, 0.0, 1, 0, 0);
cairo_pattern_add_color_stop_rgb (radial, 1.0, 0, 1, 0);
cairo_translate (cr, 100*i+50, 100*j+50);
cairo_scale (cr, 50, -50);
cairo_set_source (cr, radial);
cairo_pattern_destroy (radial);
cairo_paint(cr);
cairo_restore (cr);
angle += M_PI/17;
}
}
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (radial_outer_focus,
"Exercises the condition of rendering a radial gradial on its outer focus",
"radial", /* keywords */
NULL, /* requirements */
400, 400,
NULL, draw)