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test/Makefile.am

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Add leaky_polygon test for trapezoid rasterization corner case.
This commit is contained in:
Carl Worth 2005-01-13 14:50:35 +00:00
parent 3ae8c1ca65
commit 3016995b0d
7 changed files with 173 additions and 0 deletions
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5
ChangeLog
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@ -5,6 +5,11 @@
2005-01-13 Carl Worth <cworth@cworth.org>
* test/leaky_polygon.c:
* test/Makefile.am
* test/.cvsignore: Add leaky_polygon test for trapezoid
rasterization corner case.
* src/cairo_xlib_surface.c:
* src/cairo_glitz_surface.c:
* src/cairo_ft_font.c:

1
test/.cvsignore
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@ -3,6 +3,7 @@
Makefile
Makefile.in
fill_rule
leaky_polygon
line_width
move_to_show_surface
text_cache_crash

3
test/Makefile.am
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@ -1,6 +1,7 @@
# All new test cases go here
TESTS = \
fill_rule \
leaky_polygon \
line_width \
move_to_show_surface \
text_cache_crash \
@ -11,6 +12,7 @@ text_rotate
# here?
EXTRA_DIST = \
fill_rule-ref.png \
leaky_polygon.png \
line_width-ref.png \
move_to_show_surface-ref.png \
text_rotate-ref.png
@ -52,6 +54,7 @@ xmalloc.h
# time to break down and auto-generate the Makefile.am or something
# from autogen.sh. My, but this is painful...
fill_rule_SOURCES = fill_rule.c $(cairo_test_lib)
leaky_polygon_SOURCES = leaky_polygon.c $(cairo_test_lib)
line_width_SOURCES = line_width.c $(cairo_test_lib)
move_to_show_surface_SOURCES = move_to_show_surface.c $(cairo_test_lib)
text_cache_crash_SOURCES = text_cache_crash.c $(cairo_test_lib)

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/*
* Copyright © 2005 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Carl D. Worth <cworth@cworth.org>
*/
/* Bug history
*
* 2005-01-07 Carl Worth <cworth@cworth.org>
*
* Bug reported:
*
* From: Chris <fltk@functionalfuture.com>
* Subject: [cairo] Render to image buffer artifacts
* To: cairo@cairographics.org
* Date: Fri, 07 Jan 2005 02:22:28 -0500
*
* I've attached the code and image that shows this off. Scaling at
* different levels seems to change the corruption.
*
* For some reason there are artifacts in the alpha channel. I don't know
* if that's the only place, but the alpha channel looks bad.
*
* If you run the code and parse the attached image, directing stdout to a
* file, you can see in the lower left corner there are alpha values where
* it should be transparent.
* [...]
*
* 2005-01-11 Carl Worth <cworth@cworth.org>
*
* I trimmed the original test case down to the code that appears here.
*
*/
#include "cairo_test.h"
#define WIDTH 21
#define HEIGHT 21
cairo_test_t test = {
"leaky_polygon",
"Exercises a corner case in the trapezoid rasterization in which pixels outside the trapezoids received a non-zero alpha",
WIDTH, HEIGHT
};
static void
draw (cairo_t *cr, int width, int height)
{
cairo_scale (cr, 1.0/(1<<16), 1.0/(1<<16));
cairo_move_to (cr, 131072,39321);
cairo_line_to (cr, 1103072,1288088);
cairo_line_to (cr, 1179648,1294990);
cairo_close_path (cr);
cairo_fill (cr);
}
int
main (void)
{
return cairo_test (&test, draw);
}

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/*
* Copyright © 2005 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Carl D. Worth <cworth@cworth.org>
*/
/* Bug history
*
* 2005-01-07 Carl Worth <cworth@cworth.org>
*
* Bug reported:
*
* From: Chris <fltk@functionalfuture.com>
* Subject: [cairo] Render to image buffer artifacts
* To: cairo@cairographics.org
* Date: Fri, 07 Jan 2005 02:22:28 -0500
*
* I've attached the code and image that shows this off. Scaling at
* different levels seems to change the corruption.
*
* For some reason there are artifacts in the alpha channel. I don't know
* if that's the only place, but the alpha channel looks bad.
*
* If you run the code and parse the attached image, directing stdout to a
* file, you can see in the lower left corner there are alpha values where
* it should be transparent.
* [...]
*
* 2005-01-11 Carl Worth <cworth@cworth.org>
*
* I trimmed the original test case down to the code that appears here.
*
*/
#include "cairo_test.h"
#define WIDTH 21
#define HEIGHT 21
cairo_test_t test = {
"leaky_polygon",
"Exercises a corner case in the trapezoid rasterization in which pixels outside the trapezoids received a non-zero alpha",
WIDTH, HEIGHT
};
static void
draw (cairo_t *cr, int width, int height)
{
cairo_scale (cr, 1.0/(1<<16), 1.0/(1<<16));
cairo_move_to (cr, 131072,39321);
cairo_line_to (cr, 1103072,1288088);
cairo_line_to (cr, 1179648,1294990);
cairo_close_path (cr);
cairo_fill (cr);
}
int
main (void)
{
return cairo_test (&test, draw);
}