/usr/share/nickle/cairo.5c is in cairo-5c 1.10.
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 © 2004 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>
*/
if (!Command::valid_name ((string[]) { "Cairo" }))
Foreign::load ("libcairo-5c.so.0");
extend namespace Cairo {
public typedef void (real x, real y) move_to_func_t;
public typedef void (real x, real y) line_to_func_t;
public typedef void (real x1, real y1, real x2, real y2, real x3, real y3) curve_to_func_t;
public typedef void () close_path_func_t;
public typedef struct {
real hue, saturation, value;
} hsv_color_t;
public real width (cairo_t cr) =
Surface::width (get_target (cr));
public real height (cairo_t cr) =
Surface::height (get_target (cr));
public file open_event (cairo_t cr) =
Surface::open_event (get_target (cr));
public cairo_t new (int args...) {
int w = dim(args) > 0 ? args[0] : 0;
int h = dim(args) > 1 ? args[1] : 0;
string name = (dim (argv) > 0) ? argv[0] : "nickle";
cairo_t cr = create (Surface::create_window (name, w, h));
set_source_rgba (cr, 1, 1, 1, 1);
paint (cr);
set_source_rgba (cr, 0, 0, 0, 1);
return cr;
}
public cairo_t new_window (string name, int args...) {
int w = dim(args) > 0 ? args[0] : 0;
int h = dim(args) > 1 ? args[1] : 0;
surface_t surface = Surface::create_window (name, w, h);
cairo_t cr = create (surface);
set_source_rgba (cr, 1, 1, 1, 1);
paint (cr);
set_source_rgba (cr, 0, 0, 0, 1);
return cr;
}
public cairo_t new_image (int width, int height)
{
surface_t surface = Image::surface_create (Image::format_t.ARGB, width, height);
cairo_t cr = create (surface);
set_source_rgba (cr, 0, 0, 0, 0);
set_operator (cr, operator_t.SOURCE);
paint (cr);
set_operator (cr, operator_t.OVER);
set_source_rgba (cr, 0, 0, 0, 1);
return cr;
}
public void write_to_png (cairo_t cr, string filename)
{
surface_t surface = get_target (cr);
Surface::write_to_png (surface, filename);
}
public cairo_t new_pdf (string filename,
real width, real height)
{
surface_t surface = Pdf::surface_create (filename, width, height);
cairo_t cr = create (surface);
set_source_rgba (cr, 1, 1, 1, 1);
paint (cr);
set_source_rgba (cr, 0, 0, 0, 1);
return cr;
}
public cairo_t new_svg (string filename,
real width, real height)
{
surface_t surface = Svg::surface_create (filename, width, height);
cairo_t cr = create (surface);
return cr;
}
public cairo_t dup (cairo_t cr)
{
return create (get_target (cr));
}
real[3] to_hsv(real r, real g, real b)
{
real minimum = min (r, g, b);
real maximum = max (r, g, b);
real v = maximum;
real s = (maximum == 0) ? 0 : (maximum - minimum) / maximum;
real h = 0;
if (s != 0)
{
switch (maximum) {
case r: h = (g - b) / (maximum - minimum); break;
case g: h = 2.0 + (b - r) / (maximum - minimum); break;
case b: h = 4.0 + (r - g) / (maximum - minimum); break;
}
h = h / 6;
}
return (real[3]) { h, s, v };
}
/* convert hsv to rgb */
real[3] from_hsv(real h, real s, real v)
{
if (v == 0.0)
return (real[3]) { 0 ... };
else if (s == 0.0) {
return (real[3]) { v ... };
} else {
real h6 = (h * 6) % 6;
int i = floor (h6);
real f = h6 - i;
real p = v * (1 - s);
real q = v * (1 - (s * f));
real t = v * (1 - (s * (1 - f)));
switch(i) {
default:return (real[3]) { v, t, p };
case 1: return (real[3]) { q, v, p };
case 2: return (real[3]) { p, v, t };
case 3: return (real[3]) { p, q, v };
case 4: return (real[3]) { t, p, v };
case 5: return (real[3]) { v, p, q };
}
}
}
public rgb_color_t hsv_to_rgb (hsv_color_t hsv)
{
real[3] rgb = from_hsv (hsv.hue, hsv.saturation, hsv.value);
return (rgb_color_t) { red = rgb[0], green = rgb[1], blue = rgb[2] };
}
public hsv_color_t rgb_to_hsv (rgb_color_t rgb)
{
real[3] hsv = to_hsv (rgb.red, rgb.green, rgb.blue);
return (hsv_color_t) { hue = hsv[0], saturation = hsv[1], value = hsv[2] };
}
public void set_source_hsv (cairo_t cr, real h, real s, real v)
/*
* Set color using HSV specification
* H: hue 0 = red, 0.{3} = green, 0.{6} = blue
* S: satuation 0..1
* V: value 0..1
*/
{
set_source_rgb (cr, from_hsv (h, s, v) ...);
}
public namespace Matrix {
matrix_t multiply_scalar (matrix_t a, real scalar) =
(matrix_t) {
xx = a.xx * scalar, yx = a.yx * scalar,
xy = a.xy * scalar, yy = a.yy * scalar,
x0 = a.x0 * scalar, y0 = a.y0 * scalar };
public matrix_t identity () =
(matrix_t) {
xx = 1, yx = 0,
xy = 0, yy = 1,
x0 = 0, y0 = 0 };
public real determinant (matrix_t m) =
m.xx * m.yy - m.yx * m.xy;
/* This function isn't a correct adjoint in that the implicit 1 in the
homogeneous result should actually be ad-bc instead. But, since this
adjoint is only used in the computation of the inverse, which
divides by det (A)=ad-bc anyway, everything works out in the end. */
matrix_t adjoint (matrix_t m) =
(matrix_t) {
xx = m.yy, yx = -m.xy,
xy = -m.yx, yy = m.xx,
x0 = m.yx * m.y0 - m.yy * m.x0,
y0 = m.xy * m.x0 - m.xx * m.y0 };
/* inv (A) = 1/det (A) * adj (A) */
public matrix_t invert (matrix_t a) =
multiply_scalar (adjoint (a), 1 / determinant (a));
public matrix_t multiply (matrix_t a, matrix_t b) =
(matrix_t) {
xx = a.xx * b.xx + a.yx * b.xy,
yx = a.xx * b.yx + a.yx * b.yy,
xy = a.xy * b.xx + a.yy * b.xy,
yy = a.xy * b.yx + a.yy * b.yy,
x0 = a.x0 * b.xx + a.y0 * b.xy + b.x0,
y0 = a.x0 * b.yx + a.y0 * b.yy + b.y0 };
public matrix_t translate (matrix_t m, real tx, real ty) =
multiply ((matrix_t) {
xx = 1, yx = 0,
xy = 0, yy = 1,
x0 = tx, y0 = ty }, m);
public matrix_t scale (matrix_t m, real sx, real sy) =
multiply ((matrix_t) {
xx = sx, yx = 0,
xy = 0, yy = sy,
x0 = 0, y0 = 0 }, m);
public matrix_t rotate (matrix_t m, real a) =
multiply ((matrix_t) {
xx = (real c = cos(a)), yx = (real s = sin(a)),
xy = -s, yy = c,
x0 = 0, y0 = 0 }, m);
public point_t point (matrix_t m, point_t p) =
(point_t) {
x = m.xx * p.x + m.yx * p.y + m.x0,
y = m.xy * p.x + m.yy * p.y + m.y0
};
public point_t distance (matrix_t m, point_t p) =
(point_t) {
x = m.xx * p.x + m.yx * p.y,
y = m.xy * p.x + m.yy * p.y
};
}
}
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