84 lines
2.5 KiB
C#
84 lines
2.5 KiB
C#
#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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#if GDI
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using System.Drawing;
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#endif
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#if WPF
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using System.Windows;
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#endif
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#pragma warning disable 649
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namespace PdfSharp.Internal
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{
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struct SColor
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{
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public byte a;
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public byte r;
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public byte g;
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public byte b;
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}
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struct SCColor
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{
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public float a;
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public float r;
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public float g;
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public float b;
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}
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static class ColorHelper
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{
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public static float sRgbToScRgb(byte bval)
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{
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float num = ((float)bval) / 255f;
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if (num <= 0.0)
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return 0f;
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if (num <= 0.04045)
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return (num / 12.92f);
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if (num < 1f)
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return (float)Math.Pow((num + 0.055) / 1.055, 2.4);
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return 1f;
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}
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public static byte ScRgbTosRgb(float val)
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{
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if (val <= 0.0)
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return 0;
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if (val <= 0.0031308)
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return (byte)(((255f * val) * 12.92f) + 0.5f);
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if (val < 1.0)
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return (byte)((255f * ((1.055f * ((float)Math.Pow((double)val, 0.41666666666666669))) - 0.055f)) + 0.5f);
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return 0xff;
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}
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}
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}
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