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/*
* Copyright © 2007 Chris Wilson
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Chris Wilson not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Chris Wilson makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
* CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
* Author: Chris Wilson <chris@chris-wilson.co.uk>
* Inspiration (and path!) taken from
* http://labs.trolltech.com/blogs/2007/08/31/rasterizing-dragons/
*/
#include "cairo-perf.h"
static inline int
next_pot (int v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
static cairo_bool_t
direction (int i)
int pivot, np2;
if (i < 2)
return TRUE;
np2 = next_pot (i + 1);
if (np2 == i + 1)
pivot = np2 / 2 - 1;
return ! direction (2 * pivot - i);
static void
path (cairo_t *cr, int step, int dir, int iterations)
double dx, dy;
int i;
switch (dir) {
default:
case 0: dx = step; dy = 0; break;
case 1: dx = -step; dy = 0; break;
case 2: dx = 0; dy = step; break;
case 3: dx = 0; dy = -step; break;
for (i = 0; i < iterations; i++) {
cairo_rel_line_to (cr, dx, dy);
if (direction (i)) {
double t = dx;
dx = dy;
dy = -t;
} else {
dx = -dy;
dy = t;
static cairo_time_t
do_dragon (cairo_t *cr, int width, int height, int loops)
cairo_pattern_t *pattern;
double cx, cy, r;
cx = cy = .5 * MAX (width, height);
r = .5 * MIN (width, height);
cairo_perf_timer_start ();
while (loops--) {
pattern = cairo_pattern_create_radial (cx, cy, 0., cx, cy, r);
cairo_pattern_add_color_stop_rgb (pattern, 0., .0, .0, .0);
cairo_pattern_add_color_stop_rgb (pattern, 0.25, .5, .4, .4);
cairo_pattern_add_color_stop_rgb (pattern, .5, .8, .8, .9);
cairo_pattern_add_color_stop_rgb (pattern, 1., .9, .9, 1.);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_paint (cr);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_width (cr, 4.);
cairo_move_to (cr, cx, cy);
path (cr, 12, 0, 2048);
cairo_pattern_add_color_stop_rgb (pattern, 0., 1., 1., 1.);
cairo_pattern_add_color_stop_rgb (pattern, 1., 0., 0., 0.);
cairo_stroke(cr);
path (cr, 12, 1, 2048);
cairo_pattern_add_color_stop_rgb (pattern, 1., 1., 1., 0.);
cairo_pattern_add_color_stop_rgb (pattern, 0., 1., 0., 0.);
path (cr, 12, 2, 2048);
cairo_pattern_add_color_stop_rgb (pattern, 1., 0., 1., 1.);
cairo_pattern_add_color_stop_rgb (pattern, 0., 0., 1., 0.);
path (cr, 12, 3, 2048);
cairo_pattern_add_color_stop_rgb (pattern, 1., 1., 0., 1.);
cairo_pattern_add_color_stop_rgb (pattern, 0., 0., 0., 1.);
cairo_perf_timer_stop ();
return cairo_perf_timer_elapsed ();
do_dragon_solid (cairo_t *cr, int width, int height, int loops)
double cx, cy;
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_set_source_rgb (cr, 0, 1, 0);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_set_source_rgb (cr, 1, 1, 1);
do_dragon_solid_unaligned (cairo_t *cr, int width, int height, int loops)
cairo_translate (cr, 0.01, 0.01);
return do_dragon_solid (cr, width, height, loops);
do_dragon_solid_aligned_clip (cairo_t *cr, int width, int height, int loops)
cairo_reset_clip (cr);
cairo_rectangle (cr, 10, 10, width/2 + 10, height/2 + 10);
cairo_rectangle (cr, width/2-20, height/2-20, width/2 + 10, height/2 + 10);
cairo_clip (cr);
do_dragon_unaligned_solid_aligned_clip (cairo_t *cr, int width, int height, int loops)
do_dragon_solid_unaligned_clip (cairo_t *cr, int width, int height, int loops)
cairo_rectangle (cr, 10.5, 10.5, width/2 + 10, height/2 + 10);
cairo_rectangle (cr, width/2-20, height/2-20, width/2 + 9.5, height/2 + 9.5);
do_dragon_unaligned_solid_unaligned_clip (cairo_t *cr, int width, int height, int loops)
do_dragon_solid_circle_clip (cairo_t *cr, int width, int height, int loops)
cairo_arc (cr, width/2., height/2., MIN (width, height)/2. - 10, 0, 2 * M_PI);
cairo_bool_t
dragon_enabled (cairo_perf_t *perf)
return cairo_perf_can_run (perf, "dragon", NULL);
void
dragon (cairo_perf_t *perf, cairo_t *cr, int width, int height)
cairo_perf_run (perf, "dragon-solid", do_dragon_solid, NULL);
cairo_perf_run (perf, "dragon-unaligned-solid", do_dragon_solid_unaligned, NULL);
cairo_perf_run (perf, "dragon-solid-aligned-clip", do_dragon_solid_aligned_clip, NULL);
cairo_perf_run (perf, "dragon-unaligned-solid-aligned-clip", do_dragon_unaligned_solid_aligned_clip, NULL);
cairo_perf_run (perf, "dragon-solid-unaligned-clip", do_dragon_solid_unaligned_clip, NULL);
cairo_perf_run (perf, "dragon-unaligned-solid-unaligned-clip", do_dragon_unaligned_solid_unaligned_clip, NULL);
cairo_perf_run (perf, "dragon-solid-circle-clip", do_dragon_solid_circle_clip, NULL);
cairo_perf_run (perf, "dragon", do_dragon, NULL);