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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/.
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/* imagediff - Compare two images
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*
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* Copyright © 2004 Richard D. Worth
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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 Richard Worth
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* not be used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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* Richard Worth makes no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* RICHARD WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
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* NO EVENT SHALL RICHARD WORTH BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Richard D. Worth <richard@theworths.org> */
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#include <stdio.h>
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#include <stdlib.h>
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#include "buffer-diff.h"
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#include "xmalloc.h"
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int
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main (int argc, char *argv[])
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{
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buffer_diff_result_t result;
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cairo_status_t status;
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unsigned int ax, ay, bx, by;
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if (argc != 3 && argc != 7) {
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fprintf (stderr, "Usage: %s image1.png image2.png [ax ay bx by]\n", argv[0]);
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fprintf (stderr, "Computes an output image designed to present a \"visual diff\" such that even\n");
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fprintf (stderr, "small errors in single pixels are readily apparent in the output.\n");
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fprintf (stderr, "The output image is written on stdout.\n");
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exit (1);
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}
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if (argc == 7) {
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ax = strtoul (argv[3], NULL, 0);
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ay = strtoul (argv[4], NULL, 0);
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bx = strtoul (argv[5], NULL, 0);
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by = strtoul (argv[6], NULL, 0);
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} else {
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ax = ay = bx = by = 0;
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}
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status = image_diff (NULL, argv[1], argv[2], NULL, ax, ay, bx, by, &result);
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if (status) {
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fprintf (stderr, "Error comparing images: %s\n",
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cairo_status_to_string (status));
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return 1;
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}
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if (result.pixels_changed)
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fprintf (stderr, "Total pixels changed: %d with a maximum channel difference of %d.\n",
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result.pixels_changed,
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result.max_diff);
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return (result.pixels_changed != 0);
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}
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