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0db9e010fa
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.
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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* Copyright © 2007 Chris Wilson
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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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* Chris Wilson 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. Chris Wilson 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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* CHRIS WILSON 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 CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-perf.h"
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#include <math.h>
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static void
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add_rectangle (cairo_t *cr, double size)
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{
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double x, y;
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if (size < 1)
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return;
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cairo_get_current_point (cr, &x, &y);
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cairo_rel_move_to (cr, -size/2., -size/2.);
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cairo_rel_line_to (cr, size, 0);
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cairo_rel_line_to (cr, 0, size);
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cairo_rel_line_to (cr, -size, 0);
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cairo_close_path (cr);
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cairo_save (cr);
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cairo_translate (cr, -size/2., size);
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cairo_move_to (cr, x, y);
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cairo_rotate (cr, M_PI/4);
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add_rectangle (cr, size / M_SQRT2);
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cairo_restore (cr);
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cairo_save (cr);
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cairo_translate (cr, size/2., size);
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cairo_move_to (cr, x, y);
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cairo_rotate (cr, -M_PI/4);
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add_rectangle (cr, size / M_SQRT2);
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cairo_restore (cr);
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}
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static cairo_perf_ticks_t
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do_pythagoras_tree (cairo_t *cr, int width, int height, int loops)
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{
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double size = 128;
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cairo_perf_timer_start ();
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while (loops--) {
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cairo_save (cr);
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cairo_translate (cr, 0, height);
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cairo_scale (cr, 1, -1);
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cairo_move_to (cr, width/2, size/2);
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add_rectangle (cr, size);
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cairo_set_source_rgb (cr, 0., 0., 0.);
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cairo_fill (cr);
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cairo_restore (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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pythagoras_tree (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, "pythagoras-tree"))
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return;
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cairo_perf_run (perf, "pythagoras_tree", do_pythagoras_tree);
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}
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