Add project files.

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// Allgemeine Informationen über eine Assembly werden über die folgenden
+// Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
+// die einer Assembly zugeordnet sind.
+[assembly: AssemblyTitle("Snes8BppPlanar")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Snes8BppPlanar")]
+[assembly: AssemblyCopyright("Copyright ©  2023")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Durch Festlegen von ComVisible auf FALSE werden die Typen in dieser Assembly
+// für COM-Komponenten unsichtbar.  Wenn Sie auf einen Typ in dieser Assembly von
+// COM aus zugreifen müssen, sollten Sie das ComVisible-Attribut für diesen Typ auf "True" festlegen.
+[assembly: ComVisible(false)]
+
+// Die folgende GUID bestimmt die ID der Typbibliothek, wenn dieses Projekt für COM verfügbar gemacht wird
+[assembly: Guid("8d10bcbc-15a3-4324-a68e-e45241c6e11a")]
+
+// Versionsinformationen für eine Assembly bestehen aus den folgenden vier Werten:
+//
+//      Hauptversion
+//      Nebenversion
+//      Buildnummer
+//      Revision
+//
+// Sie können alle Werte angeben oder Standardwerte für die Build- und Revisionsnummern verwenden,
+// indem Sie "*" wie unten gezeigt eingeben:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Snes8BppPlanar.cs

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+using System;
+using System.Drawing;
+using CharactorLib.Common;
+using CharactorLib.Format;
+
+namespace Snes8BppPlanar
+{
+    public class Snes8BppPlanarFormat : FormatBase
+    {
+        public Snes8BppPlanarFormat()
+        {
+            base.FormatText = "[8][8]";
+            base.Name = "8BPP SNES Planar";
+            base.Extension = "smc,sfc,fig";
+
+            base.ColorBit = 8;
+            base.ColorNum = 256;
+            base.Width = 128;
+            base.Height = 128;
+            base.CharWidth = 8;
+            base.CharHeight = 8;
+
+            base.Readonly = false;
+            base.IsSupportMirror = true;
+            base.IsSupportRotate = true;
+            base.IsCompressed = false;
+            base.EnableAdf = true;
+
+            base.Author = "ikari_01";
+            base.Url = "https://sd2snes.de";
+        }
+
+        /* offsets into SNES bitplanes per tile */
+        byte[] PlaneOffset = { 0x00, 0x01, 0x10, 0x11, 0x20, 0x21, 0x30, 0x31 };
+
+        /* bytemap: contains image data in YYCHR internal format */
+        /* data: contains image data in source format (ROM) */
+
+        /* convert from source format (ROM) to YYCHR graphics, one tile at a time */
+        public override void ConvertMemToChr(Byte[] data, int addr, Bytemap bytemap, int px, int py)
+        {
+            for (int x = 0; x < CharWidth; x++)
+            {
+                for (int y = 0; y < CharHeight; y++)
+                {
+                    byte pixel = 0x00;
+
+                    /* gather bits from bitplanes and combine into pixel */
+                    for (int b = 0; b < ColorBit; b++)
+                    {
+                        byte tmp = data[addr + PlaneOffset[b] + 2 * y];
+                        tmp &= (byte)(1 << (CharWidth - 1 - x));
+                        tmp >>= CharWidth - 1 - x;
+                        tmp <<= b;
+                        pixel |= tmp;
+                    }
+
+                    /* get pixel address for requested coordinates in YYCHR bitmap */
+                    Point p = base.GetAdvancePixelPoint(px + x, py + y);
+                    int bytemapAddr = bytemap.GetPointAddress(p.X, p.Y);
+
+                    /* write pixel to YYCHR bitmap */
+                    bytemap.Data[bytemapAddr] = pixel;
+                }
+            }
+        }
+
+        /* convert from YYCHR graphics to source format (ROM), one tile at a time */
+        public override void ConvertChrToMem(Byte[] data, int addr, Bytemap bytemap, int px, int py)
+        {
+            for (int x = 0; x < CharWidth; x++)
+            {
+                /* mask to substitute pixel in ROM data */
+                byte mask = (byte)~(1 << (CharWidth - 1 - x));
+                for (int y = 0; y < CharHeight; y++)
+                {
+                    /* read pixel from YYCHR bitmap */
+                    Point p = base.GetAdvancePixelPoint(px + x, py + y);
+                    int bytemapAddr = bytemap.GetPointAddress(p.X, p.Y);
+                    byte pixel = bytemap.Data[bytemapAddr];
+                    for (int b = 0; b < ColorBit; b++)
+                    {
+                        /* scatter bits from pixel across ROM bitplanes */
+                        int tileAddr = addr + PlaneOffset[b] + 2 * y;
+                        byte orig = (byte)(data[tileAddr] & mask);
+                        byte bit = (byte)(pixel & (1 << b));
+                        bit >>= b;
+                        bit <<= (7 - x);
+                        orig |= bit;
+                        data[tileAddr] = orig;
+                    }
+                }
+            }
+        }
+    }
+}

Snes8BppPlanar.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{8D10BCBC-15A3-4324-A68E-E45241C6E11A}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Snes8BppPlanar</RootNamespace>
+    <AssemblyName>Snes8BppPlanar</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="CharactorLib, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>.\CharactorLib.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="Microsoft.CSharp" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Snes8BppPlanar.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Snes8BppPlanar.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.6.33815.320
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Snes8BppPlanar", "Snes8BppPlanar.csproj", "{8D10BCBC-15A3-4324-A68E-E45241C6E11A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8D10BCBC-15A3-4324-A68E-E45241C6E11A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8D10BCBC-15A3-4324-A68E-E45241C6E11A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8D10BCBC-15A3-4324-A68E-E45241C6E11A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8D10BCBC-15A3-4324-A68E-E45241C6E11A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A5D04AF4-BB3B-4125-A3DA-9BAD5B7B36C4}
+	EndGlobalSection
+EndGlobal