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/*
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 * Copyright © 2011 Intel Corporation
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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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 * Author: Chris Wilson <chris@chris-wilson.co.uk>
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 */
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#include "cairo-perf.h"
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static uint32_t 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 uint32_t const poly = 0x9a795537U;
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    uint32_t 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_time_t
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do_wide_strokes_ha (cairo_t *cr, int width, int height, int loops)
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{
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    int count;
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    state = 0xc0ffee;
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    for (count = 0; count < 1000; count++) {
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	double h = floor (uniform_random (0, height));
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	cairo_move_to (cr, floor (uniform_random (0, width)), h);
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	cairo_line_to (cr, ceil (uniform_random (0, width)), h);
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    }
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    cairo_set_line_width (cr, 5.);
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    cairo_perf_timer_start ();
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    while (loops--)
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	cairo_stroke_preserve (cr);
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    cairo_perf_timer_stop ();
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    cairo_new_path (cr);
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    return cairo_perf_timer_elapsed ();
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}
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static cairo_time_t
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do_wide_strokes_h (cairo_t *cr, int width, int height, int loops)
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{
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    int count;
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    state = 0xc0ffee;
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    for (count = 0; count < 1000; count++) {
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	double h = uniform_random (0, height);
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	cairo_move_to (cr, uniform_random (0, width), h);
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	cairo_line_to (cr, uniform_random (0, width), h);
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    }
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    cairo_set_line_width (cr, 5.);
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    cairo_perf_timer_start ();
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    while (loops--)
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	cairo_stroke_preserve (cr);
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    cairo_perf_timer_stop ();
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    cairo_new_path (cr);
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    return cairo_perf_timer_elapsed ();
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}
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static cairo_time_t
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do_wide_strokes_va (cairo_t *cr, int width, int height, int loops)
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{
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    int count;
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    state = 0xc0ffee;
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    for (count = 0; count < 1000; count++) {
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	double v = floor (uniform_random (0, width));
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	cairo_move_to (cr, v, floor (uniform_random (0, height)));
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	cairo_line_to (cr, v, ceil (uniform_random (0, height)));
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    }
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    cairo_set_line_width (cr, 5.);
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    cairo_perf_timer_start ();
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    while (loops--)
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	cairo_stroke_preserve (cr);
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    cairo_perf_timer_stop ();
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    cairo_new_path (cr);
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    return cairo_perf_timer_elapsed ();
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}
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static cairo_time_t
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do_wide_strokes_v (cairo_t *cr, int width, int height, int loops)
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{
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    int count;
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    state = 0xc0ffee;
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    for (count = 0; count < 1000; count++) {
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	double v = uniform_random (0, width);
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	cairo_move_to (cr, v, uniform_random (0, height));
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	cairo_line_to (cr, v, uniform_random (0, height));
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    }
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    cairo_set_line_width (cr, 5.);
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    cairo_perf_timer_start ();
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    while (loops--)
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	cairo_stroke_preserve (cr);
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    cairo_perf_timer_stop ();
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    cairo_new_path (cr);
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    return cairo_perf_timer_elapsed ();
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}
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static cairo_time_t
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do_wide_strokes (cairo_t *cr, int width, int height, int loops)
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{
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    int count;
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    /* lots and lots of overlapping strokes */
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    state = 0xc0ffee;
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    for (count = 0; count < 1000; count++) {
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	cairo_line_to (cr,
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		       uniform_random (0, width),
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		       uniform_random (0, height));
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    }
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    cairo_set_line_width (cr, 5.);
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    cairo_perf_timer_start ();
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    while (loops--)
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	cairo_stroke_preserve (cr);
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    cairo_perf_timer_stop ();
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    cairo_new_path (cr);
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    return cairo_perf_timer_elapsed ();
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}
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cairo_bool_t
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wide_strokes_enabled (cairo_perf_t *perf)
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{
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    return cairo_perf_can_run (perf, "wide-strokes", NULL);
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}
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void
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wide_strokes (cairo_perf_t *perf, cairo_t *cr, int width, int height)
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{
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    cairo_set_source_rgb (cr, 1., 1., 1.);
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    cairo_perf_run (perf, "wide-strokes-halign", do_wide_strokes_ha, NULL);
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    cairo_perf_run (perf, "wide-strokes-valign", do_wide_strokes_va, NULL);
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    cairo_perf_run (perf, "wide-strokes-horizontal", do_wide_strokes_h, NULL);
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    cairo_perf_run (perf, "wide-strokes-vertical", do_wide_strokes_v, NULL);
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    cairo_perf_run (perf, "wide-strokes-random", do_wide_strokes, NULL);
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}