RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 06:57:46 +00:00
Code Issues Activity Actions

LibGfx: Naive RGB/HSV conversion

Browse source
This commit is contained in:
Andreas Kling 2020-02-07 18:29:52 +01:00
parent 7291370478
commit 3b95d61b22
1 changed files with 99 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

99
Libraries/LibGfx/Color.h
View file

@ -40,6 +40,12 @@ inline constexpr u32 make_rgb(u8 r, u8 g, u8 b)
return ((r << 16) | (g << 8) | b);
}
struct HSV {
double hue { 0 };
double saturation { 0 };
double value { 0 };
};
class Color {
public:
enum NamedColor {
@ -166,6 +172,99 @@ public:
String to_string() const;
static Optional<Color> from_string(const StringView&);
HSV to_hsv() const
{
HSV hsv;
double r = static_cast<double>(red()) / 255.0;
double g = static_cast<double>(green()) / 255.0;
double b = static_cast<double>(blue()) / 255.0;
double max = AK::max(AK::max(r, g), b);
double min = AK::min(AK::min(r, g), b);
double chroma = max - min;
if (!chroma)
hsv.hue = 0.0;
else if (max == r)
hsv.hue = (60.0 * ((g - b) / chroma)) + 360.0;
else if (max == g)
hsv.hue = (60.0 * ((b - r) / chroma)) + 120.0;
else
hsv.hue = (60.0 * ((r - g) / chroma)) + 240.0;
if (hsv.hue >= 360.0)
hsv.hue -= 360.0;
hsv.hue /= 360.0;
if (!max)
hsv.saturation = 0;
else
hsv.saturation = chroma / max;
hsv.value = max;
return hsv;
}
static Color from_hsv(double hue, double saturation, double value)
{
return from_hsv({ hue, saturation, value });
}
static Color from_hsv(const HSV& hsv)
{
double hue = hsv.hue * 2.0;
double saturation = hsv.saturation / 255.0;
double value = hsv.value / 255.0;
int high = static_cast<int>(hue / 60.0) % 6;
double f = (hue / 60.0) - high;
double c1 = value * (1.0 - saturation);
double c2 = value * (1.0 - saturation * f);
double c3 = value * (1.0 - saturation * (1.0 - f));
double r = 0;
double g = 0;
double b = 0;
switch (high) {
case 0:
r = value;
g = c3;
b = c1;
break;
case 1:
r = c2;
g = value;
b = c1;
break;
case 2:
r = c1;
g = value;
b = c3;
break;
case 3:
r = c1;
g = c2;
b = value;
break;
case 4:
r = c3;
g = c1;
b = value;
break;
case 5:
r = value;
g = c1;
b = c2;
break;
}
u8 out_r = (u8)(r * 255);
u8 out_g = (u8)(g * 255);
u8 out_b = (u8)(b * 255);
return Color(out_r, out_g, out_b);
}
private:
explicit Color(RGBA32 rgba)
: m_value(rgba)