зеркало из https://github.com/mono/SkiaSharp.git
Added support for converting to/from HSV and HSL
This commit is contained in:
Matthew Leibowitz
Родитель
a76f50b6cb
Коммит
555a626395
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@ -82,6 +82,8 @@ namespace SkiaSharp
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}
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public partial struct SKColor {
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private const float EPSILON = 0.001f;
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public static readonly SKColor Empty;
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private uint color;
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@ -101,6 +103,21 @@ namespace SkiaSharp
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color = (uint)(0xff000000u | (red << 16) | (green << 8) | blue);
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}
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public SKColor WithRed (byte red)
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{
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return new SKColor (red, Green, Blue, Alpha);
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}
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public SKColor WithGreen (byte green)
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{
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return new SKColor (Red, green, Blue, Alpha);
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}
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public SKColor WithBlue (byte blue)
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{
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return new SKColor (Red, Green, blue, Alpha);
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}
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public SKColor WithAlpha (byte alpha)
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{
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return new SKColor (Red, Green, Blue, alpha);
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@ -111,6 +128,214 @@ namespace SkiaSharp
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public byte Green => (byte)((color >> 8) & 0xff);
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public byte Blue => (byte)((color) & 0xff);
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public static SKColor FromHsl (float h, float s, float l, byte a = 255)
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{
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// convert from percentages
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h = h / 360f;
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s = s / 100f;
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l = l / 100f;
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// RGB results from 0 to 255
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var r = l * 255f;
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var g = l * 255f;
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var b = l * 255f;
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// HSL from 0 to 1
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if (Math.Abs (s) > EPSILON)
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{
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float v2;
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if (l < 0.5f)
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v2 = l * (1f + s);
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else
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v2 = (l + s) - (s * l);
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var v1 = 2f * l - v2;
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r = 255 * HueToRgb (v1, v2, h + (1f / 3f));
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g = 255 * HueToRgb (v1, v2, h);
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b = 255 * HueToRgb (v1, v2, h - (1f / 3f));
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}
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return new SKColor ((byte)r, (byte)g, (byte)b, a);
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}
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private static float HueToRgb (float v1, float v2, float vH)
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{
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if (vH < 0f)
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vH += 1f;
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if (vH > 1f)
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vH -= 1f;
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if ((6f * vH) < 1f)
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return (v1 + (v2 - v1) * 6f * vH);
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if ((2f * vH) < 1f)
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return (v2);
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if ((3f * vH) < 2f)
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return (v1 + (v2 - v1) * ((2f / 3f) - vH) * 6f);
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return (v1);
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}
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public static SKColor FromHsv(float h, float s, float v, byte a = 255)
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{
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// convert from percentages
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h = h / 360f;
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s = s / 100f;
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v = v / 100f;
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// RGB results from 0 to 255
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var r = v;
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var g = v;
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var b = v;
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// HSL from 0 to 1
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if (Math.Abs (s) > EPSILON)
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{
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h = h * 6f;
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if (Math.Abs (h - 6f) < EPSILON)
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h = 0f; // H must be < 1
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var hInt = (int)h;
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var v1 = v * (1f - s);
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var v2 = v * (1f - s * (h - hInt));
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var v3 = v * (1f - s * (1f - (h - hInt)));
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if (hInt == 0)
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{
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r = v;
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g = v3;
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b = v1;
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}
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else if (hInt == 1)
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{
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r = v2;
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g = v;
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b = v1;
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}
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else if (hInt == 2)
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{
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r = v1;
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g = v;
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b = v3;
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}
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else if (hInt == 3)
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{
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r = v1;
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g = v2;
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b = v;
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}
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else if (hInt == 4)
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{
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r = v3;
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g = v1;
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b = v;
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}
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else
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{
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r = v;
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g = v1;
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b = v2;
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}
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}
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// RGB results from 0 to 255
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r = r * 255f;
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g = g * 255f;
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b = b * 255f;
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return new SKColor ((byte)r, (byte)g, (byte)b, a);
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}
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public void ToHsl (out float h, out float s, out float l)
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{
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// RGB from 0 to 255
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var r = (Red / 255f);
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var g = (Green / 255f);
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var b = (Blue / 255f);
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var min = Math.Min (Math.Min (r, g), b); // min value of RGB
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var max = Math.Max (Math.Max (r, g), b); // max value of RGB
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var delta = max - min; // delta RGB value
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// default to a gray, no chroma...
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h = 0f;
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s = 0f;
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l = (max + min) / 2f;
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// chromatic data...
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if (Math.Abs (delta) > EPSILON)
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{
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if (l < 0.5f)
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s = delta / (max + min);
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else
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s = delta / (2f - max - min);
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var deltaR = (((max - r) / 6f) + (delta / 2f)) / delta;
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var deltaG = (((max - g) / 6f) + (delta / 2f)) / delta;
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var deltaB = (((max - b) / 6f) + (delta / 2f)) / delta;
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if (Math.Abs (r - max) < EPSILON) // r == max
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h = deltaB - deltaG;
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else if (Math.Abs (g - max) < EPSILON) // g == max
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h = (1f / 3f) + deltaR - deltaB;
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else // b == max
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h = (2f / 3f) + deltaG - deltaR;
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if (h < 0f)
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h += 1f;
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if (h > 1f)
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h -= 1f;
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}
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// convert to percentages
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h = h * 360f;
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s = s * 100f;
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l = l * 100f;
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}
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public void ToHsv (out float h, out float s, out float v)
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{
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// RGB from 0 to 255
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var r = (Red / 255f);
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var g = (Green / 255f);
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var b = (Blue / 255f);
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var min = Math.Min (Math.Min (r, g), b); // min value of RGB
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var max = Math.Max (Math.Max (r, g), b); // max value of RGB
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var delta = max - min; // delta RGB value
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// default to a gray, no chroma...
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h = 0;
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s = 0;
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v = max;
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// chromatic data...
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if (Math.Abs (delta) > EPSILON)
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{
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s = delta / max;
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var deltaR = (((max - r) / 6f) + (delta / 2f)) / delta;
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var deltaG = (((max - g) / 6f) + (delta / 2f)) / delta;
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var deltaB = (((max - b) / 6f) + (delta / 2f)) / delta;
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if (Math.Abs (r - max) < EPSILON) // r == max
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h = deltaB - deltaG;
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else if (Math.Abs (g - max) < EPSILON) // g == max
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h = (1f / 3f) + deltaR - deltaB;
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else // b == max
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h = (2f / 3f) + deltaG - deltaR;
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if (h < 0f)
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h += 1f;
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if (h > 1f)
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h -= 1f;
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}
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// convert to percentages
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h = h * 360f;
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s = s * 100f;
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v = v * 100f;
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}
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public override string ToString ()
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{
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return string.Format (CultureInfo.InvariantCulture, "#{0:x2}{1:x2}{2:x2}{3:x2}", Alpha, Red, Green, Blue);
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@ -35,6 +35,7 @@
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="Xamarin.iOS" />
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<Reference Include="System.Core" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="Resources\" />
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@ -35,6 +35,7 @@
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="Xamarin.TVOS" />
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<Reference Include="System.Core" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="Resources\" />
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@ -106,6 +106,9 @@
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<Compile Include="..\Tests\SKPathTest.cs" >
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<Link>SKPathTest.cs</Link>
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</Compile>
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<Compile Include="..\Tests\SKColorTest.cs" >
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<Link>SKColorTest.cs</Link>
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</Compile>
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</ItemGroup>
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<ItemGroup>
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<Content Include="..\..\samples\SharedDemo\content-font.ttf">
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@ -0,0 +1,125 @@
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using System;
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using System.Collections.Generic;
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using NUnit.Framework;
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using SKOtherColor = System.Tuple<float, float, float>;
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using ToOtherColor = System.Tuple<SkiaSharp.SKColor, System.Tuple<float, float, float>, string>;
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namespace SkiaSharp.Tests
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{
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[TestFixture]
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public class SKColorTest : SKTest
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{
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private const float EPSILON = 0.01f;
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[Test]
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public void ColorWithComponent()
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{
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var color = new SKColor();
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Assert.AreEqual(0, color.Red);
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Assert.AreEqual(0, color.Green);
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Assert.AreEqual(0, color.Blue);
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Assert.AreEqual(0, color.Alpha);
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var red = color.WithRed(255);
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Assert.AreEqual(255, red.Red);
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Assert.AreEqual(0, red.Green);
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Assert.AreEqual(0, red.Blue);
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Assert.AreEqual(0, red.Alpha);
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var green = color.WithGreen(255);
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Assert.AreEqual(0, green.Red);
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Assert.AreEqual(255, green.Green);
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Assert.AreEqual(0, green.Blue);
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Assert.AreEqual(0, green.Alpha);
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var blue = color.WithBlue(255);
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Assert.AreEqual(0, blue.Red);
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Assert.AreEqual(0, blue.Green);
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Assert.AreEqual(255, blue.Blue);
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Assert.AreEqual(0, blue.Alpha);
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var alpha = color.WithAlpha(255);
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Assert.AreEqual(0, alpha.Red);
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Assert.AreEqual(0, alpha.Green);
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Assert.AreEqual(0, alpha.Blue);
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Assert.AreEqual(255, alpha.Alpha);
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}
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[Test]
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public void ColorRgbToHsl()
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{
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var tuples = new List<ToOtherColor> {
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new ToOtherColor(new SKColor(000, 000, 000), new SKOtherColor(000f, 000.0f, 000.0f), "Black"),
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new ToOtherColor(new SKColor(255, 000, 000), new SKOtherColor(000f, 100.0f, 050.0f), "Red"),
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new ToOtherColor(new SKColor(255, 255, 000), new SKOtherColor(060f, 100.0f, 050.0f), "Yellow"),
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new ToOtherColor(new SKColor(255, 255, 255), new SKOtherColor(000f, 000.0f, 100.0f), "White"),
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new ToOtherColor(new SKColor(128, 128, 128), new SKOtherColor(000f, 000.0f, 050.2f), "Gray"),
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new ToOtherColor(new SKColor(128, 128, 000), new SKOtherColor(060f, 100.0f, 025.1f), "Olive"),
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new ToOtherColor(new SKColor(000, 128, 000), new SKOtherColor(120f, 100.0f, 025.1f), "Green"),
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new ToOtherColor(new SKColor(000, 000, 128), new SKOtherColor(240f, 100.0f, 025.1f), "Navy"),
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};
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foreach (var item in tuples)
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{
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// values
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SKColor rgb = item.Item1;
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SKOtherColor other = item.Item2;
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// to HSL
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float h, s, l;
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rgb.ToHsl(out h, out s, out l);
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Assert.AreEqual(other.Item1, h, EPSILON, item.Item3 + " H");
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Assert.AreEqual(other.Item2, s, EPSILON, item.Item3 + " S");
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Assert.AreEqual(other.Item3, l, EPSILON, item.Item3 + " L");
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// to RGB
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SKColor back = SKColor.FromHsl(other.Item1, other.Item2, other.Item3);
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Assert.AreEqual(rgb.Red, back.Red, item.Item3 + " R");
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Assert.AreEqual(rgb.Green, back.Green, item.Item3 + " G");
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Assert.AreEqual(rgb.Blue, back.Blue, item.Item3 + " B");
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Assert.AreEqual(rgb.Alpha, back.Alpha, item.Item3 + " A");
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}
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}
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[Test]
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public void ColorRgbToHsv()
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{
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var tuples = new List<ToOtherColor> {
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new ToOtherColor(new SKColor(000, 000, 000), new SKOtherColor(000f, 000.0f, 000.0f), "Black"),
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new ToOtherColor(new SKColor(255, 000, 000), new SKOtherColor(000f, 100.0f, 100.0f), "Red"),
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new ToOtherColor(new SKColor(255, 255, 000), new SKOtherColor(060f, 100.0f, 100.0f), "Yellow"),
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new ToOtherColor(new SKColor(255, 255, 255), new SKOtherColor(000f, 000.0f, 100.0f), "White"),
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new ToOtherColor(new SKColor(128, 128, 128), new SKOtherColor(000f, 000.0f, 050.2f), "Gray"),
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new ToOtherColor(new SKColor(128, 128, 000), new SKOtherColor(060f, 100.0f, 050.2f), "Olive"),
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new ToOtherColor(new SKColor(000, 128, 000), new SKOtherColor(120f, 100.0f, 050.2f), "Green"),
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new ToOtherColor(new SKColor(000, 000, 128), new SKOtherColor(240f, 100.0f, 050.2f), "Navy"),
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};
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foreach (var item in tuples)
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{
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// values
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SKColor rgb = item.Item1;
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SKOtherColor other = item.Item2;
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// to HSV
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float h, s, v;
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rgb.ToHsv(out h, out s, out v);
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Assert.AreEqual(other.Item1, h, EPSILON, item.Item3 + " H");
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Assert.AreEqual(other.Item2, s, EPSILON, item.Item3 + " S");
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Assert.AreEqual(other.Item3, v, EPSILON, item.Item3 + " V");
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// to RGB
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SKColor back = SKColor.FromHsv(other.Item1, other.Item2, other.Item3);
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Assert.AreEqual(rgb.Red, back.Red, item.Item3 + " R");
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Assert.AreEqual(rgb.Green, back.Green, item.Item3 + " G");
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Assert.AreEqual(rgb.Blue, back.Blue, item.Item3 + " B");
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Assert.AreEqual(rgb.Alpha, back.Alpha, item.Item3 + " A");
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}
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}
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}
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}
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Ссылка в новой задаче