39 lines
1.1 KiB
C#
39 lines
1.1 KiB
C#
using System;
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using Minint.Core.Models;
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namespace Minint.Core.Services.Impl;
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public sealed class ImageEffectsService : IImageEffectsService
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{
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public void ApplyContrast(MinintDocument doc, double factor)
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{
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for (int i = 1; i < doc.Palette.Count; i++)
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{
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var c = doc.Palette[i];
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doc.Palette[i] = new RgbaColor(
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ContrastByte(c.R, factor),
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ContrastByte(c.G, factor),
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ContrastByte(c.B, factor),
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c.A);
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}
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doc.InvalidatePaletteCache();
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}
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public void ApplyGrayscale(MinintDocument doc)
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{
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for (int i = 1; i < doc.Palette.Count; i++)
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{
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var c = doc.Palette[i];
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byte gray = (byte)Math.Clamp((int)(0.299 * c.R + 0.587 * c.G + 0.114 * c.B + 0.5), 0, 255);
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doc.Palette[i] = new RgbaColor(gray, gray, gray, c.A);
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}
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doc.InvalidatePaletteCache();
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}
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private static byte ContrastByte(byte value, double factor)
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{
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double v = ((value / 255.0) - 0.5) * factor + 0.5;
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return (byte)Math.Clamp((int)(v * 255 + 0.5), 0, 255);
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}
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}
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