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/*
* This file is part of gerbolyze, a vector image preprocessing toolchain
* Copyright (C) 2021 Jan Sebastian Götte <gerbolyze@jaseg.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cmath>
#include "base64.h"
#include "svg_import_util.h"
using namespace std;
void gerbolyze::print_matrix(cairo_t *cr, bool print_examples) {
cairo_matrix_t mat;
cairo_get_matrix(cr, &mat);
cerr << " xform matrix = { xx=" << mat.xx << ", yx=" << mat.yx << ", xy=" << mat.xy << ", yy=" << mat.yy << ", x0=" << mat.x0 << ", y0=" << mat.y0 << " }" << endl;
if (print_examples) {
double x=0, y=0;
cairo_user_to_device(cr, &x, &y);
cerr << " (0, 0) -> (" << x << ", " << y << ")" << endl;
x = 1, y = 0;
cairo_user_to_device(cr, &x, &y);
cerr << " (1, 0) -> (" << x << ", " << y << ")" << endl;
x = 0, y = 1;
cairo_user_to_device(cr, &x, &y);
cerr << " (0, 1) -> (" << x << ", " << y << ")" << endl;
x = 1, y = 1;
cairo_user_to_device(cr, &x, &y);
cerr << " (1, 1) -> (" << x << ", " << y << ")" << endl;
}
}
/* Read a double value formatted like usvg formats doubles from an SVG attribute */
double gerbolyze::usvg_double_attr(const pugi::xml_node &node, const char *attr, double default_value) {
const auto *val = node.attribute(attr).value();
if (*val == '\0')
return default_value;
return atof(val);
}
/* Read an url from an usvg attribute */
string gerbolyze::usvg_id_url(string attr) {
if (attr.rfind("url(#", 0) == string::npos)
return string();
attr = attr.substr(strlen("url(#"));
attr = attr.substr(0, attr.size()-1);
return attr;
}
gerbolyze::RelativeUnits gerbolyze::map_str_to_units(string str, gerbolyze::RelativeUnits default_val) {
if (str == "objectBoundingBox")
return SVG_ObjectBoundingBox;
else if (str == "userSpaceOnUse")
return SVG_UserSpaceOnUse;
return default_val;
}
void gerbolyze::load_cairo_matrix_from_svg(const string &transform, cairo_matrix_t &mat) {
if (transform.empty()) {
cairo_matrix_init_identity(&mat);
return;
}
string start("matrix(");
assert(transform.substr(0, start.length()) == start);
assert(transform.back() == ')');
const string &foo = transform.substr(start.length(), transform.length());
const string &bar = foo.substr(0, foo.length() - 1);
istringstream xform(bar);
double a, c, e,
b, d, f;
xform >> a >> b >> c >> d >> e >> f;
assert(!xform.fail());
cairo_matrix_init(&mat, a, b, c, d, e, f);
}
void gerbolyze::apply_cairo_transform_from_svg(cairo_t *cr, const string &transform) {
cairo_matrix_t mat;
load_cairo_matrix_from_svg(transform, mat);
cairo_transform(cr, &mat); /* or cairo_transform? */
}
/* Cf. https://tools.ietf.org/html/rfc2397 */
string gerbolyze::parse_data_iri(const string &data_url) {
if (data_url.rfind("data:", 0) == string::npos) /* check if url starts with "data:" */
return string();
size_t foo = data_url.find("base64,");
if (foo == string::npos) /* check if this is actually a data URL */
return string();
size_t b64_begin = data_url.find_first_not_of(" ", foo + strlen("base64,"));
assert(b64_begin != string::npos);
return base64_decode(data_url.substr(b64_begin));
}
/* for debug svg output */
void gerbolyze::apply_viewport_matrix(cairo_t *cr, cairo_matrix_t &viewport_matrix) {
/* Multiply viewport matrix *from the left*, i.e. as if it had been applied *before* the currently set matrix. */
cairo_matrix_t old_matrix;
cairo_get_matrix(cr, &old_matrix);
cairo_set_matrix(cr, &viewport_matrix);
cairo_transform(cr, &old_matrix);
}
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