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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 "svg_color.h"
#include <assert.h>
#include <string>
#include <cmath>
using namespace gerbolyze;
using namespace std;
/* Map an SVG fill or stroke definition (color, but may also be a pattern) to a gerber color.
*
* This function handles transparency: Transparent SVG colors are mapped such that no gerber output is generated for
* them.
*/
enum gerber_color gerbolyze::svg_color_to_gerber(string color, string opacity, enum gerber_color default_val, const RenderSettings &rset) {
//cerr << "resolving svg color spec color=\"" << color << "\", opacity=\"" << opacity << "\", default=" << default_val << endl;
float alpha = 1.0;
if (!opacity.empty() && opacity[0] != '\0') {
char *endptr = nullptr;
alpha = strtof(opacity.data(), &endptr);
assert(endptr);
assert(*endptr == '\0');
}
if (color.empty()) {
//cerr << " -> default" << endl;
return default_val;
}
if (color == "none") {
//cerr << " -> none" << endl;
return GRB_NONE;
}
if (color.rfind("url(#", 0) != string::npos) {
//cerr << " -> pattern" << endl;
return GRB_PATTERN_FILL;
}
if ((color.length() == 7 && color[0] == '#') || color.rfind("rgba", 0) != string::npos) {
RGBAColor rgba(color);
HSVColor hsv(rgba);
if (alpha == 1.0)
alpha = rgba.a;
if (alpha < 0.5f) {
//cerr << " -> none" << endl;
if (alpha > 0.01) {
cerr << "Info: Found an object with opacity set to " << alpha << ". This object will be omitted from the output." << endl;
}
return GRB_NONE;
}
if ((hsv.v >= 0.5) != rset.flip_color_interpretation) {
//cerr << " -> clear" << endl;
return GRB_CLEAR;
} else {
//cerr << " -> dark" << endl;
return GRB_DARK;
}
if (hsv.v >= 0.4 && hsv.v <= 0.6) {
cerr << "Warning: color \"" << color << "\" is ambiguous. Gerbolyze decides whether to map colors to clear or dark polarity by checking if their HSV value (i.e. brightness) is above 50 %. This color has a value of " << hsv.v << ", close to 50 %." << endl;
}
}
//cerr << " -> dark" << endl;
return GRB_DARK;
}
gerbolyze::RGBAColor::RGBAColor(string spec) {
/* resvg/usvg v0.18.0 added support for rgba(...) color specs */
if (spec.rfind("rgba(", 0) != string::npos) {
/* "rgba(127, 127, 200, 255)" */
std::regex reg("rgba\\(([0-9]+),([0-9]+),([0-9]+),([0-9]+)\\)");
std::smatch match;
assert(std::regex_match(spec, match, reg));
int c[4];
for (size_t i=0; i<4; i++) {
assert (match.size() == 5);
char *endptr = nullptr;
string span = match[i+1].str();
c[i] = strtoul(span.data(), &endptr, 10);
assert(endptr && endptr != span.data());
assert(*endptr == '\0');
}
assert (0 <= c[0] && c[0] <= 255);
assert (0 <= c[1] && c[1] <= 255);
assert (0 <= c[2] && c[2] <= 255);
assert (0 <= c[3] && c[3] <= 255);
r = c[0]/255.0f;
g = c[1]/255.0f;
b = c[2]/255.0f;
a = c[3]/255.0f;
} else {
/* "#FF00E3" */
assert(spec[0] == '#');
char *endptr = nullptr;
const char *c = spec.data();
int rgb = strtol(c + 1, &endptr, 16);
assert(endptr);
assert(endptr == c + 7);
assert(*endptr == '\0');
r = ((rgb >> 16) & 0xff) / 255.0f;
g = ((rgb >> 8) & 0xff) / 255.0f;
b = ((rgb >> 0) & 0xff) / 255.0f;
a = 1.0;
}
};
gerbolyze::HSVColor::HSVColor(const RGBAColor &color) {
float xmax = fmax(color.r, fmax(color.g, color.b));
float xmin = fmin(color.r, fmin(color.g, color.b));
float c = xmax - xmin;
v = xmax;
if (c == 0)
h = 0;
else if (v == color.r)
h = 1/3 * (0 + (color.g - color.b) / c);
else if (v == color.g)
h = 1/3 * (2 + (color.b - color.r) / c);
else // v == color.b
h = 1/3 * (4 + (color.r - color.g) / c);
s = (v == 0) ? 0 : (c/v);
}
/* Invert gerber color */
enum gerber_color gerbolyze::gerber_color_invert(enum gerber_color color) {
switch (color) {
case GRB_CLEAR: return GRB_DARK;
case GRB_DARK: return GRB_CLEAR;
default: return color; /* none, pattern */
}
}
/* Read node's fill attribute and convert it to a gerber color */
enum gerber_color gerbolyze::gerber_fill_color(const pugi::xml_node &node, const RenderSettings &rset) {
return svg_color_to_gerber(node.attribute("fill").value(), node.attribute("fill-opacity").value(), GRB_DARK, rset);
}
/* Read node's stroke attribute and convert it to a gerber color */
enum gerber_color gerbolyze::gerber_stroke_color(const pugi::xml_node &node, const RenderSettings &rset) {
return svg_color_to_gerber(node.attribute("stroke").value(), node.attribute("stroke-opacity").value(), GRB_NONE, rset);
}
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