DarthAffe/HPPH
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Made colors equatable; added more tests; small improvements; changed test-data to cover more edge-cases

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DarthAffe committed 2024-07-20 16:25:53 +02:00
1 parent 9999681574
commit 2a26c4404f
26 files changed
+378 -152
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HPPH.Reference/PixelHelper.Quantize.cs
+25 -12
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@@ -6,8 +6,9 @@ public static partial class ReferencePixelHelper
{
#region Methods
public static IColor[] CreateColorPalette(IImage image, int paletteSize)
=> CreateColorPalette(image.ToArray(), paletteSize);
public static T[] CreateColorPalette<T>(Image<T> image, int paletteSize)
where T : unmanaged, IColor
=> CreateColorPalette<T>(image.ToArray(), paletteSize);
public static T[] CreateColorPalette<T>(RefImage<T> image, int paletteSize)
where T : unmanaged, IColor
@@ -15,17 +16,20 @@ public static partial class ReferencePixelHelper
public static T[] CreateColorPalette<T>(Span<T> colors, int paletteSize)
where T : unmanaged, IColor =>
CreateColorPalette(colors.ToArray().Cast<IColor>().ToArray(), paletteSize).Select(x => T.Create(x.R, x.G, x.B, x.A)).Cast<T>().ToArray();
CreateColorPalette<T>(colors.ToArray().Cast<IColor>().ToArray(), paletteSize).Select(x => T.Create(x.R, x.G, x.B, x.A)).Cast<T>().ToArray();
private static IColor[] CreateColorPalette(IColor[] colors, int paletteSize)
private static IColor[] CreateColorPalette<T>(IColor[] colors, int paletteSize)
where T : struct, IColor
{
if (paletteSize == 0) return [];
int splits = BitOperations.Log2((uint)paletteSize);
List<ColorCube> cubes = [new ColorCube(colors)];
HashSet<ColorCube> cubes = [new ColorCube(colors)];
for (int i = 0; i < splits; i++)
{
List<ColorCube> currentCubes = [.. cubes];
HashSet<ColorCube> currentCubes = [.. cubes];
foreach (ColorCube currentCube in currentCubes)
{
currentCube.Split(out ColorCube a, out ColorCube b);
@@ -35,7 +39,7 @@ public static partial class ReferencePixelHelper
}
}
return cubes.Select(c => c.GetAverageColor()).ToArray();
return cubes.Select(c => c.GetAverageColor<T>()).ToArray();
}
#endregion
@@ -53,6 +57,12 @@ internal class ColorCube
internal ColorCube(IList<IColor> colors)
{
if (colors.Count == 0)
{
_colors = [];
return;
}
int redRange = colors.Max(c => c.R) - colors.Min(c => c.R);
int greenRange = colors.Max(c => c.G) - colors.Min(c => c.G);
int blueRange = colors.Max(c => c.B) - colors.Min(c => c.B);
@@ -77,17 +87,20 @@ internal class ColorCube
b = new ColorCube(_colors.GetRange(median, _colors.Count - median));
}
internal IColor GetAverageColor()
internal IColor GetAverageColor<T>()
where T : struct, IColor
{
if (_colors.Count == 0) return T.Create(0, 0, 0, 0);
int r = _colors.Sum(x => x.R);
int g = _colors.Sum(x => x.G);
int b = _colors.Sum(x => x.B);
int a = _colors.Sum(x => x.A);
return new ColorRGBA((byte)(r / _colors.Count),
(byte)(g / _colors.Count),
(byte)(b / _colors.Count),
(byte)(a / _colors.Count));
return T.Create((byte)(r / _colors.Count),
(byte)(g / _colors.Count),
(byte)(b / _colors.Count),
(byte)(a / _colors.Count));
}
#endregion