/usr/share/nickle/nichrome-lozenge.5c is in cairo-5c 1.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright © 2008 Keith Packard
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Keith Packard
*
* Contributor(s):
* Keith Packard <keithp@keithp.com>
*/
autoload Nichrome;
extend namespace Nichrome {
public namespace Lozenge {
protected rgba_color_t illum (rgba_color_t c, real add) {
return (rgba_color_t) {
red = max (min (c.red + add, 1), 0),
green = max (min (c.green + add, 1), 0),
blue = max (min (c.blue + add, 1), 0),
alpha = c.alpha };
}
protected rgba_color_t interp (rgba_color_t l, rgba_color_t r, real ratio)
{
return (rgba_color_t) {
red = l.red * (1-ratio) + r.red * ratio,
green = l.green * (1-ratio) + r.green * ratio,
blue = l.blue * (1-ratio) + r.blue * ratio,
alpha = l.alpha * (1-ratio) + r.alpha * ratio };
}
protected void outline (cairo_t cr, int width, int height)
{
height = height & ~1;
int radius = height / 2;
move_to (cr, radius, height);
arc (cr, radius, radius, radius, pi/2, -pi/2);
line_to (cr, width - radius, 0);
arc (cr, width - radius, radius, radius, -pi/2, pi/2);
close_path (cr);
}
protected void draw (cairo_t cr, int width, int height, rgba_color_t color,
int highlight)
{
real add = .3;
int xhighlight = highlight;
int yhighlight = highlight;
save (cr);
if (height > width) {
rotate (cr, pi/2);
translate (cr, 0, -width);
int t = width; width = height; height = t;
xhighlight = highlight;
yhighlight = -highlight;
}
height = height & ~1;
int radius = height / 2;
outline (cr, width, height);
clip (cr);
rgba_color_t light = color;
rgba_color_t lighter = illum (light, add);
rgba_color_t medium = light;
rgba_color_t darker = illum (light, -add);
pattern_t pat = Pattern::create_radial (radius + xhighlight,
radius + yhighlight,
0,
radius + xhighlight,
radius + yhighlight,
radius);
Pattern::add_color_stop_rgba (pat, 0, lighter.red, lighter.green,
lighter.blue, lighter.alpha);
Pattern::add_color_stop_rgba (pat, 0.5, medium.red, medium.green,
medium.blue, medium.alpha);
Pattern::add_color_stop_rgba (pat, 1, darker.red, darker.green,
darker.blue, darker.alpha);
set_source (cr, pat);
rectangle (cr, 0, 0, radius + xhighlight, height);
fill (cr);
pattern_t pat = Pattern::create_linear (0, yhighlight, 0,
height + yhighlight);
Pattern::add_color_stop_rgba (pat, 0, darker.red, darker.green,
darker.blue, darker.alpha);
Pattern::add_color_stop_rgba (pat, 0.25, medium.red, medium.green,
medium.blue, medium.alpha);
Pattern::add_color_stop_rgba (pat, 0.5, lighter.red, lighter.green,
lighter.blue, lighter.alpha);
Pattern::add_color_stop_rgba (pat, 0.75, medium.red, medium.green,
medium.blue, medium.alpha);
Pattern::add_color_stop_rgba (pat, 1, darker.red, darker.green,
darker.blue, darker.alpha);
set_source (cr, pat);
rectangle (cr, radius + xhighlight, 0, width - height, height);
fill (cr);
pattern_t pat = Pattern::create_radial (width - radius + xhighlight,
radius + yhighlight,
0,
width - radius + xhighlight,
radius + yhighlight,
radius);
Pattern::add_color_stop_rgba (pat, 0, lighter.red, lighter.green,
lighter.blue, lighter.alpha);
Pattern::add_color_stop_rgba (pat, 0.5, medium.red, medium.green,
medium.blue, medium.alpha);
Pattern::add_color_stop_rgba (pat, 1, darker.red, darker.green,
darker.blue, darker.alpha);
set_source (cr, pat);
rectangle (cr, width - radius + xhighlight, 0, radius - xhighlight, height);
fill (cr);
restore (cr);
}
}
}
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