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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.
99 lines
3 KiB
C
99 lines
3 KiB
C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright (c) 2008 M Joonas Pihlaja
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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,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* 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
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "cairo-perf.h"
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#define NUM_SEGMENTS 256
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static unsigned state;
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static double
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uniform_random (double minval, double maxval)
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{
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static unsigned const poly = 0x9a795537U;
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unsigned n = 32;
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while (n-->0)
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state = 2*state < state ? (2*state ^ poly) : 2*state;
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return minval + state * (maxval - minval) / 4294967296.0;
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}
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static cairo_perf_ticks_t
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draw_random (cairo_t *cr, cairo_fill_rule_t fill_rule,
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int width, int height, int loops)
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{
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int i;
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double x[NUM_SEGMENTS];
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double y[NUM_SEGMENTS];
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cairo_save (cr);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_paint (cr);
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for (i = 0; i < NUM_SEGMENTS; i++) {
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x[i] = uniform_random (0, width);
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y[i] = uniform_random (0, height);
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}
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state = 0x12345678;
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cairo_translate (cr, 1, 1);
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cairo_set_fill_rule (cr, fill_rule);
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cairo_set_source_rgb (cr, 1, 0, 0);
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cairo_move_to (cr, 0, 0);
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for (i = 0; i < NUM_SEGMENTS; i++)
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cairo_line_to (cr, x[i], y[i]);
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cairo_close_path (cr);
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cairo_perf_timer_start ();
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while (loops--)
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cairo_fill_preserve (cr);
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cairo_perf_timer_stop ();
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cairo_restore (cr);
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return cairo_perf_timer_elapsed ();
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}
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static cairo_perf_ticks_t
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random_eo (cairo_t *cr, int width, int height, int loops)
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{
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return draw_random (cr, CAIRO_FILL_RULE_EVEN_ODD, width, height, loops);
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}
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static cairo_perf_ticks_t
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random_nz (cairo_t *cr, int width, int height, int loops)
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{
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return draw_random (cr, CAIRO_FILL_RULE_WINDING, width, height, loops);
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}
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void
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intersections (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, "intersections"))
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return;
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cairo_perf_run (perf, "intersections-nz-fill", random_nz);
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cairo_perf_run (perf, "intersections-eo-fill", random_eo);
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}
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