1180ebdc1f
We initially used Cairo for its bezier flattening algorithm. That algorithm turned out to be a bit too imprecise at the scales we're working at here (#17), so I ended up porting over some code from Antigrain Graphics. The only other thing we used Cairo for was debug output and coordinate transforms, so I just wrote the relevant vector math in a small header file, deleted all debug output code and thus eliminated the cairo dependency. This is a step towards Windows builds.
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/*
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* This file is part of gerbolyze, a vector image preprocessing toolchain
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* Copyright (C) 2021 Jan Sebastian Götte <gerbolyze@jaseg.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <cmath>
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#include "base64.h"
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#include "svg_import_util.h"
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using namespace std;
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/* Read a double value formatted like usvg formats doubles from an SVG attribute */
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double gerbolyze::usvg_double_attr(const pugi::xml_node &node, const char *attr, double default_value) {
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const auto *val = node.attribute(attr).value();
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if (*val == '\0')
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return default_value;
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return atof(val);
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}
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/* Read an url from an usvg attribute */
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string gerbolyze::usvg_id_url(string attr) {
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if (attr.rfind("url(#", 0) == string::npos)
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return string();
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attr = attr.substr(strlen("url(#"));
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attr = attr.substr(0, attr.size()-1);
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return attr;
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}
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gerbolyze::RelativeUnits gerbolyze::map_str_to_units(string str, gerbolyze::RelativeUnits default_val) {
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if (str == "objectBoundingBox")
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return SVG_ObjectBoundingBox;
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else if (str == "userSpaceOnUse")
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return SVG_UserSpaceOnUse;
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return default_val;
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}
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/* Cf. https://tools.ietf.org/html/rfc2397 */
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string gerbolyze::parse_data_iri(const string &data_url) {
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if (data_url.rfind("data:", 0) == string::npos) /* check if url starts with "data:" */
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return string();
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size_t foo = data_url.find("base64,");
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if (foo == string::npos) /* check if this is actually a data URL */
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return string();
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size_t b64_begin = data_url.find_first_not_of(" ", foo + strlen("base64,"));
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assert(b64_begin != string::npos);
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return base64_decode(data_url.substr(b64_begin));
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}
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