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Add HSL conversions

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Shane Woolcock
2020-05-19 14:27:40 +09:30
parent bc3faf81d4
commit 23e62dddc3
2 changed files with 98 additions and 0 deletions
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1
osu-framework.sln.DotSettings
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@@ -304,6 +304,7 @@
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=2D/@EntryIndexedValue">2D</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=3D/@EntryIndexedValue">3D</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HID/@EntryIndexedValue">HID</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HSL/@EntryIndexedValue">HSL</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HUD/@EntryIndexedValue">HUD</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=ID/@EntryIndexedValue">ID</s:String>
<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=IL/@EntryIndexedValue">IL</s:String>

97
osu.Framework/Graphics/Colour4.cs
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@@ -397,6 +397,103 @@ namespace osu.Framework.Graphics
return new Vector4(hue, saturation, max, A);
}
/// <summary>
/// Converts an HSL colour to a <see cref="Colour4"/>. All components should be in the range 0-1.
/// </summary>
/// <param name="hue">The hue, between 0 and 1.</param>
/// <param name="saturation">The saturation, between 0 and 1.</param>
/// <param name="lightness">The value, between 0 and 1.</param>
/// <param name="alpha">The alpha, between 0 and 1.</param>
public static Colour4 FromHSL(float hue, float saturation, float lightness, float alpha = 1f)
{
var c = (1f - Math.Abs(2f * lightness - 1f)) * saturation;
var h = hue * 6f;
var x = c * (1f - Math.Abs(h % 2f - 1f));
float r, g, b;
if (0f <= h && h < 1f)
{
r = c;
g = x;
b = 0f;
}
else if (1f <= h && h < 2f)
{
r = x;
g = c;
b = 0f;
}
else if (2f <= h && h < 3f)
{
r = 0f;
g = c;
b = x;
}
else if (3f <= h && h < 4f)
{
r = 0f;
g = x;
b = c;
}
else if (4f <= h && h < 5f)
{
r = x;
g = 0f;
b = c;
}
else if (5f <= h && h < 6f)
{
r = c;
g = 0f;
b = x;
}
else
r = g = b = 0f;
var m = lightness - c * 0.5f;
return new Colour4(r + m, g + m, b + m, alpha);
}
/// <summary>
/// Converts a <see cref="Colour4"/> to the HSL colour space, represented in the XYZ components of a <see cref="Vector4"/>.
/// The returned vector's W component represents the alpha channel of the colour.
/// The angular hue is compressed to the 0-1 range in line with the other components.
/// </summary>
/// <returns>A <see cref="Vector4"/> representing the colour, where all four components are in the 0-1 range.</returns>
public Vector4 ToHSL()
{
var red = R;
var green = G;
var blue = B;
var max = Math.Max(red, Math.Max(green, blue));
var min = Math.Min(red, Math.Min(green, blue));
var c = max - min;
float h = 0f;
if (max == red)
h = (green - blue) / c;
else if (max == green)
h = (blue - red) / c + 2f;
else if (max == blue)
h = (red - green) / c + 4f;
var hue = h / 6f;
if (hue < 0f)
hue += 1f;
var lightness = (max + min) / 2f;
var saturation = 0.0f;
if (lightness != 0f && lightness != 1f)
saturation = c / (1f - Math.Abs(2f * lightness - 1f));
return new Vector4(hue, saturation, lightness, A);
}
private const double gamma = 2.4;
private static double toLinear(double color) => color <= 0.04045 ? color / 12.92 : Math.Pow((color + 0.055) / 1.055, gamma);