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
|
/*************************************************************************
** Opacity.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 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 General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include "Opacity.hpp"
using namespace std;
string Opacity::cssBlendMode (BlendMode bm) {
switch (bm) {
case BM_NORMAL : return "normal";
case BM_MULTIPLY : return "multiply";
case BM_SCREEN : return "screen";
case BM_OVERLAY : return "overlay";
case BM_SOFTLIGHT : return "soft-light";
case BM_HARDLIGHT : return "hard-light";
case BM_COLORDODGE: return "color-dodge";
case BM_COLORBURN : return "color-burn";
case BM_DARKEN : return "darken";
case BM_LIGHTEN : return "lighten";
case BM_DIFFERENCE: return "difference";
case BM_EXCLUSION : return "exclusion";
case BM_HUE : return "hue";
case BM_SATURATION: return "saturation";
case BM_COLOR : return "color";
case BM_LUMINOSITY: return "luminosity";
}
return "";
}
static string to_lower_drop_nonalpha (const string &str) {
string ret;
if (!str.empty()) {
ret.reserve(str.length());
for (char c : str) {
if (isalpha(c))
ret += char(tolower(c));
}
}
return ret;
}
Opacity::BlendMode Opacity::blendMode (const std::string &name) {
struct {
const char *name;
BlendMode mode;
} modes[] = {
{"normal", BM_NORMAL },
{"multiply", BM_MULTIPLY },
{"screen", BM_SCREEN },
{"overlay", BM_OVERLAY },
{"softlight", BM_SOFTLIGHT },
{"hardlight", BM_HARDLIGHT },
{"colordodge", BM_COLORDODGE},
{"colorburn", BM_COLORBURN },
{"darken", BM_DARKEN },
{"lighten", BM_LIGHTEN },
{"difference", BM_DIFFERENCE},
{"exclusion", BM_EXCLUSION },
{"hue", BM_HUE },
{"saturation", BM_SATURATION},
{"color", BM_COLOR },
{"luminosity", BM_LUMINOSITY}
};
string compname = to_lower_drop_nonalpha(name);
for (const auto &m : modes) {
if (compname == m.name)
return m.mode;
}
return BM_NORMAL;
}
bool Opacity::operator == (const Opacity &opacity) const {
return opacity._fillalpha == _fillalpha
&& opacity._strokealpha == _strokealpha
&& opacity._blendMode == _blendMode;
}
bool Opacity::operator != (const Opacity &opacity) const {
return opacity._fillalpha != _fillalpha
|| opacity._strokealpha != _strokealpha
|| opacity._blendMode != _blendMode;
}
|