diff options
Diffstat (limited to 'src/svg_import_util.cpp')
| -rw-r--r-- | src/svg_import_util.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/svg_import_util.cpp b/src/svg_import_util.cpp new file mode 100644 index 0000000..5624bd9 --- /dev/null +++ b/src/svg_import_util.cpp @@ -0,0 +1,129 @@ +/* + * This program source code file is part of KICAD, a free EDA CAD application. + * + * Copyright (C) 2021 Jan Sebastian Götte <kicad@jaseg.de> + * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you may find one here: + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html + * or you may search the http://www.gnu.org website for the version 2 license, + * or you may write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#include <cmath> +#include "base64.h" +#include "svg_import_util.h" + +using namespace std; + +void svg_plugin::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 svg_plugin::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 svg_plugin::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; +} + +svg_plugin::RelativeUnits svg_plugin::map_str_to_units(string str, svg_plugin::RelativeUnits default_val) { + if (str == "objectBoundingBox") + return SVG_ObjectBoundingBox; + else if (str == "userSpaceOnUse") + return SVG_UserSpaceOnUse; + return default_val; +} + +void svg_plugin::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 svg_plugin::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 svg_plugin::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 svg_plugin::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); +} + |