1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
* 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()) {
return default_val;
}
if (color == "none") {
return GRB_NONE;
}
if (color.rfind("url(#", 0) != string::npos) {
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) {
return GRB_NONE;
}
if ((hsv.v >= 0.5) != rset.flip_color_interpretation) {
return GRB_CLEAR;
} else {
return GRB_DARK;
}
}
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);
}
|
