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Improve RGB Min Max evaluation performance by using 2 or 3 comparison… #50622

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merged 5 commits into from
Apr 6, 2021
Merged

Improve RGB Min Max evaluation performance by using 2 or 3 comparison… #50622

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7a0fabe
Improve RGB Min Max evaluation performance by using 2 or 3 comparison…
L2 Apr 1, 2021
59d5387
Conform trailing braces to .NET style guide
L2 Apr 1, 2021
8341fe2
Add missing functional test cases for MinMaxRgb
L2 Apr 2, 2021
03644b6
Use ternary conditional operator and out var initialization
L2 Apr 2, 2021
5c109b7
Simplify by removing nested conditionals
L2 Apr 5, 2021
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32 changes: 26 additions & 6 deletions src/libraries/System.Drawing.Primitives/src/System/Drawing/Color.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -487,12 +487,34 @@ private void GetRgbValues(out int r, out int g, out int b)
b = (int)(value & ARGBBlueMask) >> ARGBBlueShift;
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void MinMaxRgb(out int min, out int max, int r, int g, int b)
{
if (r > g)
{
max = r;
min = g;
}
else
{
max = g;
min = r;
}
if (b > max)
{
max = b;
}
else if (b < min)
{
min = b;
}
}

public float GetBrightness()
{
GetRgbValues(out int r, out int g, out int b);

int min = Math.Min(Math.Min(r, g), b);
int max = Math.Max(Math.Max(r, g), b);
MinMaxRgb(out int min, out int max, r, g, b);

return (max + min) / (byte.MaxValue * 2f);
}
Expand All @@ -504,8 +526,7 @@ public float GetHue()
if (r == g && g == b)
return 0f;

int min = Math.Min(Math.Min(r, g), b);
int max = Math.Max(Math.Max(r, g), b);
MinMaxRgb(out int min, out int max, r, g, b);

float delta = max - min;
float hue;
Expand All @@ -531,8 +552,7 @@ public float GetSaturation()
if (r == g && g == b)
return 0f;

int min = Math.Min(Math.Min(r, g), b);
int max = Math.Max(Math.Max(r, g), b);
MinMaxRgb(out int min, out int max, r, g, b);

int div = max + min;
if (div > byte.MaxValue)
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6 changes: 6 additions & 0 deletions src/libraries/System.Drawing.Primitives/tests/ColorTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -390,6 +390,12 @@ private void CheckRed(Color color)
[InlineData(51, 255, 51, 0.6f)]
[InlineData(51, 51, 255, 0.6f)]
[InlineData(51, 51, 51, 0.2f)]
[InlineData(0, 51, 255, 0.5f)]
[InlineData(51, 255, 0, 0.5f)]
[InlineData(0, 255, 51, 0.5f)]
[InlineData(255, 0, 51, 0.5f)]
[InlineData(51, 0, 255, 0.5f)]
[InlineData(255, 51, 0, 0.5f)]
public void GetBrightness(int r, int g, int b, float expected)
{
Assert.Equal(expected, Color.FromArgb(r, g, b).GetBrightness());
Expand Down