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
|
#ifndef __COLORUTILS_H__
#define __COLORUTILS_H__
#include <math.h>
static const qreal yc[3] = {0.2126, 0.7152, 0.0722};
// normalize: like qBound(a, 0.0, 1.0) but without needing the args and with
// "safer" behavior on NaN (isnan(a) -> return 0.0)
static inline qreal normalize(qreal a) {
return (a < 1.0 ? (a > 0.0 ? a : 0.0) : 1.0);
}
class KHCY {
static qreal gamma(qreal n) {
return pow(normalize(n), 2.2);
}
static qreal igamma(qreal n) {
return pow(normalize(n), 1.0 / 2.2);
}
static qreal lumag(qreal r, qreal g, qreal b) {
return r * yc[0] + g * yc[1] + b * yc[2];
}
public:
KHCY(const QColor&);
KHCY(qreal h_, qreal c_, qreal y_, qreal a_ = 1.0);
QColor qColor() const;
qreal h, c, y, a;
static qreal luma(const QColor&);
};
class ColorUtils {
static QColor tintHelper(const QColor& base, const QColor& color, qreal amount);
static qreal contrastRatio(const QColor& c1, const QColor& c2);
public:
static QColor tint(const QColor&, const QColor&, qreal amount = .3);
static QColor mix(const QColor&, const QColor&, qreal bias = .5);
static qreal luma(const QColor& color) {
return KHCY::luma(color);
}
static QColor shade(const QColor&, qreal lumaAmount, qreal chromaAmount = 0.0);
static QColor darken(const QColor&, qreal amount = 0.5, qreal chromaGain = 1.0);
static QColor lighten(const QColor&, qreal amount = 0.5, qreal chromaInverseGain = 1.0);
};
#endif
|
