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Fix `HSPAColour.ToColour` not being pure

This commit is contained in:
Dean Herbert 2022-11-06 23:35:51 +09:00
parent 51078bddf9
commit 75bf023f14
1 changed files with 47 additions and 46 deletions
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93
osu.Game/Graphics/HSPAColour.cs
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@ -96,100 +96,101 @@ public Color4 ToColor4()
float minOverMax = 1f - S;
Color4 result = new Color4 { A = A };
float h = H;
if (minOverMax > 0f)
{
if (H < 1f / 6f)
if (h < 1f / 6f)
{
H = 6f * (H - 0f / 6f);
float part = 1f + H * (1f / minOverMax - 1f);
h = 6f * (h - 0f / 6f);
float part = 1f + h * (1f / minOverMax - 1f);
result.B = P / MathF.Sqrt(p_r / minOverMax / minOverMax + p_g * part * part + p_b);
result.R = result.B / minOverMax;
result.G = result.B + H * (result.R - result.B);
result.G = result.B + h * (result.R - result.B);
}
else if (H < 2f / 6f)
else if (h < 2f / 6f)
{
H = 6f * (-H + 2f / 6f);
float part = 1f + H * (1f / minOverMax - 1f);
h = 6f * (-h + 2f / 6f);
float part = 1f + h * (1f / minOverMax - 1f);
result.B = P / MathF.Sqrt(p_g / minOverMax / minOverMax + p_r * part * part + p_b);
result.G = result.B / minOverMax;
result.R = result.B + H * (result.G - result.B);
result.R = result.B + h * (result.G - result.B);
}
else if (H < 3f / 6f)
else if (h < 3f / 6f)
{
H = 6f * (H - 2f / 6f);
float part = 1f + H * (1f / minOverMax - 1f);
h = 6f * (h - 2f / 6f);
float part = 1f + h * (1f / minOverMax - 1f);
result.R = P / MathF.Sqrt(p_g / minOverMax / minOverMax + p_b * part * part + p_r);
result.G = result.R / minOverMax;
result.B = result.R + H * (result.G - result.R);
result.B = result.R + h * (result.G - result.R);
}
else if (H < 4f / 6f)
else if (h < 4f / 6f)
{
H = 6f * (-H + 4f / 6f);
float part = 1f + H * (1f / minOverMax - 1f);
h = 6f * (-h + 4f / 6f);
float part = 1f + h * (1f / minOverMax - 1f);
result.R = P / MathF.Sqrt(p_b / minOverMax / minOverMax + p_g * part * part + p_r);
result.B = result.R / minOverMax;
result.G = result.R + H * (result.B - result.R);
result.G = result.R + h * (result.B - result.R);
}
else if (H < 5f / 6f)
else if (h < 5f / 6f)
{
H = 6f * (H - 4f / 6f);
float part = 1f + H * (1f / minOverMax - 1f);
h = 6f * (h - 4f / 6f);
float part = 1f + h * (1f / minOverMax - 1f);
result.G = P / MathF.Sqrt(p_b / minOverMax / minOverMax + p_r * part * part + p_g);
result.B = result.G / minOverMax;
result.R = result.G + H * (result.B - result.G);
result.R = result.G + h * (result.B - result.G);
}
else
{
H = 6f * (-H + 6f / 6f);
float part = 1f + H * (1f / minOverMax - 1f);
h = 6f * (-h + 6f / 6f);
float part = 1f + h * (1f / minOverMax - 1f);
result.G = P / MathF.Sqrt(p_r / minOverMax / minOverMax + p_b * part * part + p_g);
result.R = result.G / minOverMax;
result.B = result.G + H * (result.R - result.G);
result.B = result.G + h * (result.R - result.G);
}
}
else
{
if (H < 1f / 6f)
if (h < 1f / 6f)
{
H = 6f * (H - 0f / 6f);
result.R = MathF.Sqrt(P * P / (p_r + p_g * H * H));
result.G = result.R * H;
h = 6f * (h - 0f / 6f);
result.R = MathF.Sqrt(P * P / (p_r + p_g * h * h));
result.G = result.R * h;
result.B = 0f;
}
else if (H < 2f / 6f)
else if (h < 2f / 6f)
{
H = 6f * (-H + 2f / 6f);
result.G = MathF.Sqrt(P * P / (p_g + p_r * H * H));
result.R = result.G * H;
h = 6f * (-h + 2f / 6f);
result.G = MathF.Sqrt(P * P / (p_g + p_r * h * h));
result.R = result.G * h;
result.B = 0f;
}
else if (H < 3f / 6f)
else if (h < 3f / 6f)
{
H = 6f * (H - 2f / 6f);
result.G = MathF.Sqrt(P * P / (p_g + p_b * H * H));
result.B = result.G * H;
h = 6f * (h - 2f / 6f);
result.G = MathF.Sqrt(P * P / (p_g + p_b * h * h));
result.B = result.G * h;
result.R = 0f;
}
else if (H < 4f / 6f)
else if (h < 4f / 6f)
{
H = 6f * (-H + 4f / 6f);
result.B = MathF.Sqrt(P * P / (p_b + p_g * H * H));
result.G = result.B * H;
h = 6f * (-h + 4f / 6f);
result.B = MathF.Sqrt(P * P / (p_b + p_g * h * h));
result.G = result.B * h;
result.R = 0f;
}
else if (H < 5f / 6f)
else if (h < 5f / 6f)
{
H = 6f * (H - 4f / 6f);
result.B = MathF.Sqrt(P * P / (p_b + p_r * H * H));
result.R = result.B * H;
h = 6f * (h - 4f / 6f);
result.B = MathF.Sqrt(P * P / (p_b + p_r * h * h));
result.R = result.B * h;
result.G = 0f;
}
else
{
H = 6f * (-H + 6f / 6f);
result.R = MathF.Sqrt(P * P / (p_r + p_b * H * H));
result.B = result.R * H;
h = 6f * (-h + 6f / 6f);
result.R = MathF.Sqrt(P * P / (p_r + p_b * h * h));
result.B = result.R * h;
result.G = 0f;
}
}