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By ensuring that tests take longer than a couple of seconds we eliminate systematic errors in our measurements. However, we also effectively eliminate the synchronisation overhead. To compensate, we attempt to estimate the overhead by reporting the difference between a single instance and the minimum averaged instance.
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* Copyright © 2006 Jeff Muizelaar <jeff@infidigm.net>
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* Copyright © 2006 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors: Jeff Muizelaar <jeff@infidigm.net>
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* Carl Worth <cworth@cworth.org>
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*/
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#include "cairo-perf.h"
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static cairo_perf_ticks_t
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do_unaligned_clip (cairo_t *cr, int width, int height, int loops)
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{
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cairo_perf_timer_start ();
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while (loops--) {
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/* First a triangular clip that obviously isn't along device-pixel
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* boundaries. */
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cairo_move_to (cr, 50, 50);
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cairo_line_to (cr, 50, 90);
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cairo_line_to (cr, 90, 90);
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cairo_close_path (cr);
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cairo_clip (cr);
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/* Then a rectangular clip that would be but for the non-integer
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* scaling. */
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cairo_scale (cr, 1.1, 1.1);
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cairo_rectangle (cr, 55, 55, 35, 35);
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cairo_clip (cr);
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/* And paint something to force the clip to be evaluated. */
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cairo_paint (cr);
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cairo_reset_clip (cr);
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}
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cairo_perf_timer_stop ();
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return cairo_perf_timer_elapsed ();
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}
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void
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unaligned_clip (cairo_perf_t *perf, cairo_t *cr, int width, int height)
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{
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if (! cairo_perf_can_run (perf, "unaligned-clip"))
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return;
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cairo_perf_run (perf, "unaligned-clip", do_unaligned_clip);
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}
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