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436c0c8be2
In order to run under memfault, the framework is first extended to handle running concurrent tests - i.e. multi-threading. (Not that this is a requirement for memfault, instead it shares a common goal of storing per-test data). To that end all the global data is moved into a per-test context and the targets are adjusted to avoid overlap on shared, global resources (such as output files and frame buffers). In order to preserve the simplicity of the standard draw routines, the context is not passed explicitly as a parameter to the routines, but is instead attached to the cairo_t via the user_data. For the masochist, to enable the tests to be run across multiple threads simply set the environment variable CAIRO_TEST_NUM_THREADS to the desired number. In the long run, we can hope the need for memfault (runtime testing of error paths) will be mitigated by static analysis. A promising candidate for this task would appear to be http://hal.cs.berkeley.edu/cil/.
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/*
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* Copyright © 2005 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Carl D. Worth <cworth@cworth.org>
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*/
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/* Bug history
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*
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* 2005-01-07 Carl Worth <cworth@cworth.org>
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*
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* Bug reported:
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*
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* From: Chris <fltk@functionalfuture.com>
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* Subject: [cairo] Render to image buffer artifacts
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* To: cairo@cairographics.org
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* Date: Fri, 07 Jan 2005 02:22:28 -0500
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*
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* I've attached the code and image that shows this off. Scaling at
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* different levels seems to change the corruption.
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*
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* For some reason there are artifacts in the alpha channel. I don't know
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* if that's the only place, but the alpha channel looks bad.
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*
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* If you run the code and parse the attached image, directing stdout to a
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* file, you can see in the lower left corner there are alpha values where
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* it should be transparent.
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* [...]
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*
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* 2005-01-11 Carl Worth <cworth@cworth.org>
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*
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* I trimmed the original test case down to the code that appears here.
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*
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*/
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#include "cairo-test.h"
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#define WIDTH 21
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#define HEIGHT 21
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static cairo_test_draw_function_t draw;
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static const cairo_test_t test = {
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"leaky-polygon",
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"Exercises a corner case in the trapezoid rasterization in which pixels outside the trapezoids received a non-zero alpha",
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WIDTH, HEIGHT,
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draw
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};
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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_scale (cr, 1.0/(1<<16), 1.0/(1<<16));
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cairo_move_to (cr, 131072,39321);
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cairo_line_to (cr, 1103072,1288088);
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cairo_line_to (cr, 1179648,1294990);
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cairo_close_path (cr);
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cairo_fill (cr);
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return CAIRO_TEST_SUCCESS;
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}
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int
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main (void)
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{
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return cairo_test (&test);
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}
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