From a05db9b66af15d3a413b25586610e5314def5dae Mon Sep 17 00:00:00 2001
From: L1Q <0xL1Q@ex.ua>
Date: Fri, 3 Jul 2020 10:31:39 +0300
Subject: [PATCH] Add RGB Split image effect

---
 ShareX.ImageEffectsLib/Filters/RGBSplit.cs    | 70 +++++++++++++++++++
 ShareX.ImageEffectsLib/ImageEffectsForm.cs    |  1 +
 .../ShareX.ImageEffectsLib.csproj             |  1 +
 3 files changed, 72 insertions(+)
 create mode 100644 ShareX.ImageEffectsLib/Filters/RGBSplit.cs

diff --git a/ShareX.ImageEffectsLib/Filters/RGBSplit.cs b/ShareX.ImageEffectsLib/Filters/RGBSplit.cs
new file mode 100644
index 000000000..3feb2f39a
--- /dev/null
+++ b/ShareX.ImageEffectsLib/Filters/RGBSplit.cs
@@ -0,0 +1,70 @@
+#region License Information (GPL v3)
+
+/*
+    ShareX - A program that allows you to take screenshots and share any file type
+    Copyright (c) 2007-2020 ShareX Team
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; either version 2
+    of the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
+*/
+
+#endregion License Information (GPL v3)
+
+using ShareX.HelpersLib;
+using System.ComponentModel;
+using System.Drawing;
+using System.Drawing.Imaging;
+
+namespace ShareX.ImageEffectsLib
+{
+    [Description("RGB Split")]
+    internal class RGBSplit : ImageEffect
+    {
+        [DefaultValue(typeof(Point), "5, 0")]
+        public Point OffsetRed { get; set; }
+        [DefaultValue(typeof(Point), "0, 0")]
+        public Point OffsetGreen { get; set; }
+        [DefaultValue(typeof(Point), "-5, 0")]
+        public Point OffsetBlue { get; set; }
+
+        public override Bitmap Apply(Bitmap bmp)
+        {
+            Bitmap bmpResult = bmp.CreateEmptyBitmap();
+            using (UnsafeBitmap source = new UnsafeBitmap(bmp, true, ImageLockMode.ReadOnly))
+            using (UnsafeBitmap dest = new UnsafeBitmap(bmpResult, true, ImageLockMode.WriteOnly))
+            {
+                for (int y = 0; y < dest.Height; y++)
+                {
+                    for (int x = 0; x < dest.Width; x++)
+                    {
+                        ColorBgra colorR = source.GetPixel(MathHelpers.Clamp(x + OffsetRed.X, 0, dest.Width - 1), MathHelpers.Clamp(y + OffsetRed.Y, 0, dest.Height - 1));
+                        ColorBgra colorG = source.GetPixel(MathHelpers.Clamp(x + OffsetGreen.X, 0, dest.Width - 1), MathHelpers.Clamp(y + OffsetGreen.Y, 0, dest.Height - 1));
+                        ColorBgra colorB = source.GetPixel(MathHelpers.Clamp(x + OffsetBlue.X, 0, dest.Width - 1), MathHelpers.Clamp(y + OffsetBlue.Y, 0, dest.Height - 1));
+
+                        byte colorR_alpha = colorR.Alpha;
+                        byte colorG_alpha = colorG.Alpha;
+                        byte colorB_alpha = colorB.Alpha;
+                        byte colorA = (byte)((colorR_alpha / 3 + colorG_alpha / 3 + colorB_alpha / 3));
+
+                        ColorBgra shiftedcolor = new ColorBgra((byte)(colorB.Blue * colorB_alpha / 255), (byte)(colorG.Green * colorG_alpha / 255), (byte)(colorR.Red * colorR_alpha / 255), colorA);
+                        dest.SetPixel(x, y, shiftedcolor);
+                    }
+                }
+            }
+            return bmpResult;
+        }
+    }
+}
\ No newline at end of file
diff --git a/ShareX.ImageEffectsLib/ImageEffectsForm.cs b/ShareX.ImageEffectsLib/ImageEffectsForm.cs
index f78846e9b..9ab7e16c6 100644
--- a/ShareX.ImageEffectsLib/ImageEffectsForm.cs
+++ b/ShareX.ImageEffectsLib/ImageEffectsForm.cs
@@ -162,6 +162,7 @@ private void AddAllEffectsToContextMenu()
                 typeof(MeanRemoval),
                 typeof(Outline),
                 typeof(Pixelate),
+                typeof(RGBSplit),
                 typeof(Reflection),
                 typeof(Shadow),
                 typeof(Sharpen),
diff --git a/ShareX.ImageEffectsLib/ShareX.ImageEffectsLib.csproj b/ShareX.ImageEffectsLib/ShareX.ImageEffectsLib.csproj
index 58be5dbe3..806400e34 100644
--- a/ShareX.ImageEffectsLib/ShareX.ImageEffectsLib.csproj
+++ b/ShareX.ImageEffectsLib/ShareX.ImageEffectsLib.csproj
@@ -119,6 +119,7 @@
     <Compile Include="Filters\MatrixConvolution.cs" />
     <Compile Include="Filters\MeanRemoval.cs" />
     <Compile Include="Filters\Outline.cs" />
+    <Compile Include="Filters\RGBSplit.cs" />
     <Compile Include="Filters\Pixelate.cs" />
     <Compile Include="Filters\Sharpen.cs" />
     <Compile Include="Filters\Slice.cs" />