Adding upstream version 1.3.upstream/1.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 296 insertions, 0 deletions

diff --git a/src/2geom/svg-path-writer.cpp b/src/2geom/svg-path-writer.cpp
new file mode 100644
index 0000000..1b8cabe
--- /dev/null
+++ b/src/2geom/svg-path-writer.cpp
@@ -0,0 +1,296 @@
+/** @file
+ * @brief Path sink which writes an SVG-compatible command string
+ *//*
+ * Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ * 
+ * Copyright 2014 Authors
+ *
+ * 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.
+ */
+
+#include <cmath>
+#include <iomanip>
+#include <2geom/coord.h>
+#include <2geom/svg-path-writer.h>
+#include <glib.h>
+
+namespace Geom {
+
+static inline bool is_digit(char c) {
+    return c >= '0' && c <= '9';
+}
+
+SVGPathWriter::SVGPathWriter()
+    : _epsilon(0)
+    , _precision(-1)
+    , _optimize(false)
+    , _use_shorthands(true)
+    , _command(0)
+{
+    // always use C locale for number formatting
+    _ns.imbue(std::locale::classic());
+    _ns.unsetf(std::ios::floatfield);
+}
+
+void SVGPathWriter::moveTo(Point const &p)
+{
+    _setCommand('M');
+    _current_pars.push_back(p[X]);
+    _current_pars.push_back(p[Y]);
+
+    _current = _subpath_start = _quad_tangent = _cubic_tangent = p;
+    if (!_optimize) {
+        flush();
+    }
+}
+
+void SVGPathWriter::lineTo(Point const &p)
+{
+    // The weird setting of _current is to avoid drift with many almost-aligned segments
+    // The additional conditions ensure that the smaller dimension is rounded to zero
+    bool written = false;
+    if (_use_shorthands) {
+        Point r = _current - p;
+        if (are_near(p[X], _current[X], _epsilon) && std::abs(r[X]) < std::abs(r[Y])) {
+            // emit vlineto
+            _setCommand('V');
+            _current_pars.push_back(p[Y]);
+            _current[Y] = p[Y];
+            written = true;
+        } else if (are_near(p[Y], _current[Y], _epsilon) && std::abs(r[Y]) < std::abs(r[X])) {
+            // emit hlineto
+            _setCommand('H');
+            _current_pars.push_back(p[X]);
+            _current[X] = p[X];
+            written = true;
+        }
+    }
+
+    if (!written) {
+        // emit normal lineto
+        if (_command != 'M' && _command != 'L') {
+            _setCommand('L');
+        }
+        _current_pars.push_back(p[X]);
+        _current_pars.push_back(p[Y]);
+        _current = p;
+    }
+
+    _cubic_tangent = _quad_tangent = _current;
+    if (!_optimize) {
+        flush();
+    }
+}
+
+void SVGPathWriter::quadTo(Point const &c, Point const &p)
+{
+    bool shorthand = _use_shorthands && are_near(c, _quad_tangent, _epsilon);
+
+    _setCommand(shorthand ? 'T' : 'Q');
+    if (!shorthand) {
+        _current_pars.push_back(c[X]);
+        _current_pars.push_back(c[Y]);
+    }
+    _current_pars.push_back(p[X]);
+    _current_pars.push_back(p[Y]);
+
+    _current = _cubic_tangent = p;
+    _quad_tangent = p + (p - c);
+    if (!_optimize) {
+        flush();
+    }
+}
+
+void SVGPathWriter::curveTo(Point const &p1, Point const &p2, Point const &p3)
+{
+    bool shorthand = _use_shorthands && are_near(p1, _cubic_tangent, _epsilon);
+
+    _setCommand(shorthand ? 'S' : 'C');
+    if (!shorthand) {
+        _current_pars.push_back(p1[X]);
+        _current_pars.push_back(p1[Y]);
+    }
+    _current_pars.push_back(p2[X]);
+    _current_pars.push_back(p2[Y]);
+    _current_pars.push_back(p3[X]);
+    _current_pars.push_back(p3[Y]);
+
+    _current = _quad_tangent = p3;
+    _cubic_tangent = p3 + (p3 - p2);
+    if (!_optimize) {
+        flush();
+    }
+}
+
+void SVGPathWriter::arcTo(double rx, double ry, double angle,
+                          bool large_arc, bool sweep, Point const &p)
+{
+    _setCommand('A');
+    _current_pars.push_back(rx);
+    _current_pars.push_back(ry);
+    _current_pars.push_back(deg_from_rad(angle));
+    _current_pars.push_back(large_arc ? 1. : 0.);
+    _current_pars.push_back(sweep ? 1. : 0.);
+    _current_pars.push_back(p[X]);
+    _current_pars.push_back(p[Y]);
+
+    _current = _quad_tangent = _cubic_tangent = p;
+    if (!_optimize) {
+        flush();
+    }
+}
+
+void SVGPathWriter::closePath()
+{
+    flush();
+    if (_optimize) {
+        _s << "z";
+    } else {
+        _s << " z";
+    }
+    _current = _quad_tangent = _cubic_tangent = _subpath_start;
+}
+
+void SVGPathWriter::flush()
+{
+    if (_command == 0 || _current_pars.empty()) return;
+
+    if (_optimize) {
+        _s << _command;
+    } else {
+        if (_s.tellp() != 0) {
+            _s << ' ';
+        }
+        _s << _command;
+    }
+
+    char lastchar = _command;
+    bool contained_dot = false;
+
+    for (double _current_par : _current_pars) {
+        // TODO: optimize the use of absolute / relative coords
+        std::string cs = _formatCoord(_current_par);
+
+        // Separator handling logic.
+        // Floating point values can end with a digit or dot
+        // and start with a digit, a plus or minus sign, or a dot.
+        // The following cases require a separator:
+        // * digit-digit
+        // * digit-dot (only if the previous number didn't contain a dot)
+        // * dot-digit
+        if (_optimize) {
+            // C++11: change to front()
+            char firstchar = cs[0];
+            if (is_digit(lastchar)) {
+                if (is_digit(firstchar)) {
+                    _s << " ";
+                } else if (firstchar == '.' && !contained_dot) {
+                    _s << " ";
+                }
+            } else if (lastchar == '.' && is_digit(firstchar)) {
+                _s << " ";
+            }
+            _s << cs;
+
+            // C++11: change to back()
+            lastchar = cs[cs.length()-1];
+            contained_dot = cs.find('.') != std::string::npos;
+        } else {
+            _s << " " << cs;
+        }
+    }
+    _current_pars.clear();
+    _command = 0;
+}
+
+void SVGPathWriter::clear()
+{
+    _s.clear();
+    _s.str("");
+    _ns.clear();
+    _ns.str("");
+    _command = 0;
+    _current_pars.clear();
+    _current = Point(0,0);
+    _subpath_start = Point(0,0);
+}
+
+void SVGPathWriter::setPrecision(int prec)
+{
+    _precision = prec;
+    if (prec < 0) {
+        _epsilon = 0;
+    } else {
+        _epsilon = std::pow(10., -prec);
+        _ns << std::setprecision(_precision);
+    }
+}
+
+void SVGPathWriter::_setCommand(char cmd)
+{
+    if (_command != 0 && _command != cmd) {
+        flush();
+    }
+    _command = cmd;
+}
+
+std::string SVGPathWriter::_formatCoord(Coord par)
+{
+    std::string ret;
+    if (_precision < 0) {
+        ret = format_coord_shortest(par);
+    } else {
+        _ns << par;
+        ret = _ns.str();
+        _ns.clear();
+        _ns.str("");
+    }
+    return ret;
+}
+
+
+std::string write_svg_path(PathVector const &pv, int prec, bool optimize, bool shorthands)
+{
+    SVGPathWriter writer;
+    writer.setPrecision(prec);
+    writer.setOptimize(optimize);
+    writer.setUseShorthands(shorthands);
+
+    writer.feed(pv);
+    return writer.str();
+}
+
+} // namespace Geom
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :