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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/.
102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
/*
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* Copyright © 2006 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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#include "cairo-test.h"
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#define SIZE 3
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#define REPS 10
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/* History:
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*
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* 2006-06-13 Paul Giblock reports a "Stange alpha channel problem" on
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* the cairo mailing list.
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*
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* 2006-06-13 Carl Worth writes this test in an attempt to reproduce
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* the problem. The test first fills in a 3x3 rectangle with red, then
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* starts pounding on that center pixel with various forms of
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* zero-alpha rendering to see if its value can ever be made to
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* change.
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*
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* 2006-06-13 Paul Giblock reports that this only happens with the
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* xlib backend, and then only on some systems.
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*/
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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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"zero-alpha",
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"Testing that drawing with zero alpha has no effect",
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SIZE, SIZE,
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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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int i;
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cairo_surface_t *surface;
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uint32_t zero = 0;
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/* First paint background red. */
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cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); /* red */
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cairo_paint (cr);
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/* Then we paint zero-alpha in several ways (always REPS times): */
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/* 1. fill a rectangle with a zero-alpha solid source. */
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cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.0); /* transparent */
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cairo_rectangle (cr, 1.0, 1.0, 1.0, 1.0);
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for (i=0; i < REPS; i++)
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cairo_fill_preserve (cr);
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cairo_new_path (cr);
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/* 2. paint with a zero-alpha image surface source. */
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surface = cairo_image_surface_create_for_data ((unsigned char *) &zero,
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CAIRO_FORMAT_ARGB32, 1, 1, 4);
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cairo_set_source_surface (cr, surface, 1, 1);
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for (i=0; i < REPS; i++)
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cairo_paint (cr);
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/* 3. clip to rectangle then paint with zero-alpha solid source. */
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cairo_rectangle (cr, 1.0, 1.0, 1.0, 1.0);
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cairo_clip (cr);
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cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.0); /* transparent */
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for (i=0; i < REPS; i++)
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cairo_paint (cr);
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/* 4. With the clip still there, paint our image surface. */
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cairo_set_source_surface (cr, surface, 1, 1);
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for (i=0; i < REPS; i++)
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cairo_paint (cr);
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cairo_surface_destroy (surface);
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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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