Add support for sprites with alpha mask

- Sprites with alpha mask can now be viewed and exported with transparency
- Added hotkeys to control display of an alpha mask  on the preview tab
- Added an option to the export settings to enable/disable export with alpha mask as well
- Prevented texture2D preview options from being changed with hotkeys outside of texture preview (e.g. when some other asset is selected)

AssetStudioGUI/AssetStudioGUI.csproj

@@ -1,83 +1,83 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-	<PropertyGroup>
-		<OutputType>WinExe</OutputType>
-		<TargetFrameworks>net472;net6.0-windows</TargetFrameworks>
-		<UseWindowsForms>true</UseWindowsForms>
-		<ApplicationIcon>Resources\as.ico</ApplicationIcon>
-		<AssemblyTitle>AssetStudio Mod by VaDiM</AssemblyTitle>
-		<Version>0.16.47.1</Version>
-		<Copyright>Copyright © Perfare 2018-2022</Copyright>
-		<DebugType>embedded</DebugType>
-	</PropertyGroup>
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFrameworks>net472;net6.0-windows</TargetFrameworks>
+        <UseWindowsForms>true</UseWindowsForms>
+        <ApplicationIcon>Resources\as.ico</ApplicationIcon>
+        <AssemblyTitle>AssetStudio Mod by VaDiM</AssemblyTitle>
+        <Version>0.16.47.1</Version>
+        <Copyright>Copyright © Perfare 2018-2022</Copyright>
+        <DebugType>embedded</DebugType>
+    </PropertyGroup>
 
-	<ItemGroup>
-		<ProjectReference Include="..\AssetStudioUtility\AssetStudioUtility.csproj" />
-		<ProjectReference Include="..\AssetStudio\AssetStudio.csproj" />
-	</ItemGroup>
+    <ItemGroup>
+        <ProjectReference Include="..\AssetStudioUtility\AssetStudioUtility.csproj" />
+        <ProjectReference Include="..\AssetStudio\AssetStudio.csproj" />
+    </ItemGroup>
+    
+    <ItemGroup>
+        <None Update="Properties\Settings.settings">
+            <Generator>SettingsSingleFileGenerator</Generator>
+            <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+        </None>
+        <Compile Update="Properties\Settings.Designer.cs">
+            <DesignTimeSharedInput>True</DesignTimeSharedInput>
+            <AutoGen>True</AutoGen>
+            <DependentUpon>Settings.settings</DependentUpon>
+        </Compile>
+    </ItemGroup>
 
-	<ItemGroup>
-		<None Include="Properties\Settings.settings">
-			<Generator>SettingsSingleFileGenerator</Generator>
-			<LastGenOutput>Settings.Designer.cs</LastGenOutput>
-		</None>
-		<Compile Update="Properties\Settings.Designer.cs">
-			<AutoGen>True</AutoGen>
-			<DependentUpon>Settings.settings</DependentUpon>
-			<DesignTimeSharedInput>True</DesignTimeSharedInput>
-		</Compile>
-	</ItemGroup>
+    <ItemGroup>
+        <EmbeddedResource Update="Properties\Resources.resx">
+            <Generator>ResXFileCodeGenerator</Generator>
+            <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+        </EmbeddedResource>
+        <Compile Update="Properties\Resources.Designer.cs">
+            <AutoGen>True</AutoGen>
+            <DependentUpon>Resources.resx</DependentUpon>
+            <DesignTime>True</DesignTime>
+        </Compile>
+    </ItemGroup>
 
-	<ItemGroup>
-		<EmbeddedResource Update="Properties\Resources.resx">
-			<Generator>ResXFileCodeGenerator</Generator>
-			<LastGenOutput>Resources.Designer.cs</LastGenOutput>
-		</EmbeddedResource>
-		<Compile Update="Properties\Resources.Designer.cs">
-			<AutoGen>True</AutoGen>
-			<DependentUpon>Resources.resx</DependentUpon>
-			<DesignTime>True</DesignTime>
-		</Compile>
-	</ItemGroup>
+    <ItemGroup>
+        <ContentWithTargetPath Include="Libraries\x86\fmod.dll">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+            <TargetPath>x86\fmod.dll</TargetPath>
+        </ContentWithTargetPath>
+        <ContentWithTargetPath Include="Libraries\x64\fmod.dll">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+            <TargetPath>x64\fmod.dll</TargetPath>
+        </ContentWithTargetPath>
+    </ItemGroup>
 
-	<ItemGroup>
-		<ContentWithTargetPath Include="Libraries\x86\fmod.dll">
-			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-			<TargetPath>x86\fmod.dll</TargetPath>
-		</ContentWithTargetPath>
-		<ContentWithTargetPath Include="Libraries\x64\fmod.dll">
-			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-			<TargetPath>x64\fmod.dll</TargetPath>
-		</ContentWithTargetPath>
-	</ItemGroup>
+    <ItemGroup Condition=" '$(TargetFramework)' != 'net472' ">
+        <PackageReference Include="OpenTK" Version="4.6.7" />
+        <Reference Include="OpenTK.WinForms">
+            <HintPath>Libraries\OpenTK.WinForms.dll</HintPath>
+        </Reference>
+    </ItemGroup>
 
-	<ItemGroup Condition=" '$(TargetFramework)' != 'net472' ">
-		<PackageReference Include="OpenTK" Version="4.6.7" />
-		<Reference Include="OpenTK.WinForms">
-			<HintPath>Libraries\OpenTK.WinForms.dll</HintPath>
-		</Reference>
-	</ItemGroup>
+    <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
+        <PackageReference Include="OpenTK" Version="3.1.0" />
+        <PackageReference Include="OpenTK.GLControl" Version="3.1.0" />
+    </ItemGroup>
 
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
-		<PackageReference Include="OpenTK" Version="3.1.0" />
-		<PackageReference Include="OpenTK.GLControl" Version="3.1.0" />
-	</ItemGroup>
+    <ItemGroup>
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    </ItemGroup>
 
-	<ItemGroup>
-		<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-	</ItemGroup>
+    <Target Name="CopyExtraFiles" AfterTargets="AfterBuild">
+        <Copy SourceFiles="$(SolutionDir)AssetStudioFBXNative\bin\Win32\$(Configuration)\AssetStudioFBXNative.dll" DestinationFolder="$(TargetDir)x86" ContinueOnError="true" />
+        <Copy SourceFiles="$(SolutionDir)AssetStudioFBXNative\bin\x64\$(Configuration)\AssetStudioFBXNative.dll" DestinationFolder="$(TargetDir)x64" ContinueOnError="true" />
+        <Copy SourceFiles="$(SolutionDir)Texture2DDecoderNative\bin\Win32\$(Configuration)\Texture2DDecoderNative.dll" DestinationFolder="$(TargetDir)x86" ContinueOnError="true" />
+        <Copy SourceFiles="$(SolutionDir)Texture2DDecoderNative\bin\x64\$(Configuration)\Texture2DDecoderNative.dll" DestinationFolder="$(TargetDir)x64" ContinueOnError="true" />
+    </Target>
 
-	<Target Name="CopyExtraFiles" AfterTargets="AfterBuild">
-		<Copy SourceFiles="$(SolutionDir)AssetStudioFBXNative\bin\Win32\$(Configuration)\AssetStudioFBXNative.dll" DestinationFolder="$(TargetDir)x86" ContinueOnError="true" />
-		<Copy SourceFiles="$(SolutionDir)AssetStudioFBXNative\bin\x64\$(Configuration)\AssetStudioFBXNative.dll" DestinationFolder="$(TargetDir)x64" ContinueOnError="true" />
-		<Copy SourceFiles="$(SolutionDir)Texture2DDecoderNative\bin\Win32\$(Configuration)\Texture2DDecoderNative.dll" DestinationFolder="$(TargetDir)x86" ContinueOnError="true" />
-		<Copy SourceFiles="$(SolutionDir)Texture2DDecoderNative\bin\x64\$(Configuration)\Texture2DDecoderNative.dll" DestinationFolder="$(TargetDir)x64" ContinueOnError="true" />
-	</Target>
-
-	<Target Name="PublishExtraFiles" AfterTargets="Publish">
-		<Copy SourceFiles="$(TargetDir)x86\AssetStudioFBXNative.dll" DestinationFolder="$(PublishDir)x86" ContinueOnError="true" />
-		<Copy SourceFiles="$(TargetDir)x64\AssetStudioFBXNative.dll" DestinationFolder="$(PublishDir)x64" ContinueOnError="true" />
-		<Copy SourceFiles="$(TargetDir)x86\Texture2DDecoderNative.dll" DestinationFolder="$(PublishDir)x86" ContinueOnError="true" />
-		<Copy SourceFiles="$(TargetDir)x64\Texture2DDecoderNative.dll" DestinationFolder="$(PublishDir)x64" ContinueOnError="true" />
-	</Target>
+    <Target Name="PublishExtraFiles" AfterTargets="Publish">
+        <Copy SourceFiles="$(TargetDir)x86\AssetStudioFBXNative.dll" DestinationFolder="$(PublishDir)x86" ContinueOnError="true" />
+        <Copy SourceFiles="$(TargetDir)x64\AssetStudioFBXNative.dll" DestinationFolder="$(PublishDir)x64" ContinueOnError="true" />
+        <Copy SourceFiles="$(TargetDir)x86\Texture2DDecoderNative.dll" DestinationFolder="$(PublishDir)x86" ContinueOnError="true" />
+        <Copy SourceFiles="$(TargetDir)x64\Texture2DDecoderNative.dll" DestinationFolder="$(PublishDir)x64" ContinueOnError="true" />
+    </Target>
 </Project>

AssetStudioGUI/AssetStudioGUIForm.cs

@@ -43,6 +43,10 @@ namespace AssetStudioGUI
         private uint FMODlenms;
         private float FMODVolume = 0.8f;
 
+        #region SpriteControl
+        private SpriteMaskMode spriteMaskVisibleMode = SpriteMaskMode.On;
+        #endregion
+
         #region TexControl
         private static char[] textureChannelNames = new[] { 'B', 'G', 'R', 'A' };
         private bool[] textureChannels = new[] { true, true, true, true };
@@ -315,24 +319,41 @@ namespace AssetStudioGUI
                 if (e.Control)
                 {
                     var need = false;
-                    switch (e.KeyCode)
+                    if (lastSelectedItem.Type == ClassIDType.Texture2D)
                     {
-                        case Keys.B:
-                            textureChannels[0] = !textureChannels[0];
-                            need = true;
-                            break;
-                        case Keys.G:
-                            textureChannels[1] = !textureChannels[1];
-                            need = true;
-                            break;
-                        case Keys.R:
-                            textureChannels[2] = !textureChannels[2];
-                            need = true;
-                            break;
-                        case Keys.A:
-                            textureChannels[3] = !textureChannels[3];
-                            need = true;
-                            break;
+                        switch (e.KeyCode)
+                        {
+                            case Keys.B:
+                                textureChannels[0] = !textureChannels[0];
+                                need = true;
+                                break;
+                            case Keys.G:
+                                textureChannels[1] = !textureChannels[1];
+                                need = true;
+                                break;
+                            case Keys.R:
+                                textureChannels[2] = !textureChannels[2];
+                                need = true;
+                                break;
+                            case Keys.A:
+                                textureChannels[3] = !textureChannels[3];
+                                need = true;
+                                break;
+                        }
+                    }
+                    else if (lastSelectedItem.Type == ClassIDType.Sprite && !((Sprite)lastSelectedItem.Asset).m_RD.alphaTexture.IsNull)
+                    {
+                        switch (e.KeyCode)
+                        {
+                            case Keys.A:
+                                spriteMaskVisibleMode = spriteMaskVisibleMode == SpriteMaskMode.On ? SpriteMaskMode.Off : SpriteMaskMode.On;
+                                need = true;
+                                break;
+                            case Keys.M:
+                                spriteMaskVisibleMode = spriteMaskVisibleMode == SpriteMaskMode.MaskOnly ? SpriteMaskMode.On : SpriteMaskMode.MaskOnly;
+                                need = true;
+                                break;
+                        }
                     }
                     if (need)
                     {
@@ -1170,13 +1191,19 @@ namespace AssetStudioGUI
 
         private void PreviewSprite(AssetItem assetItem, Sprite m_Sprite)
         {
-            var image = m_Sprite.GetImage();
+            var image = m_Sprite.GetImage(spriteMaskVisibleMode);
             if (image != null)
             {
                 var bitmap = new DirectBitmap(image.ConvertToBytes(), image.Width, image.Height);
                 image.Dispose();
                 assetItem.InfoText = $"Width: {bitmap.Width}\nHeight: {bitmap.Height}\n";
                 PreviewTexture(bitmap);
+
+                if (!m_Sprite.m_RD.alphaTexture.IsNull)
+                {
+                    assetItem.InfoText += $"Alpha Mask: {spriteMaskVisibleMode}\n";
+                    StatusStripUpdate("'Ctrl'+'A' - Enable/Disable alpha mask usage. 'Ctrl'+'M' - Show alpha mask only.");
+                }
             }
             else
             {

AssetStudioGUI/ExportOptions.Designer.cs

@@ -32,6 +32,7 @@
             this.OKbutton = new System.Windows.Forms.Button();
             this.Cancel = new System.Windows.Forms.Button();
             this.groupBox1 = new System.Windows.Forms.GroupBox();
+            this.exportSpriteWithAlphaMask = new System.Windows.Forms.CheckBox();
             this.openAfterExport = new System.Windows.Forms.CheckBox();
             this.restoreExtensionName = new System.Windows.Forms.CheckBox();
             this.assetGroupOptions = new System.Windows.Forms.ComboBox();
@@ -94,6 +95,7 @@
             // groupBox1
             // 
             this.groupBox1.AutoSize = true;
+            this.groupBox1.Controls.Add(this.exportSpriteWithAlphaMask);
             this.groupBox1.Controls.Add(this.openAfterExport);
             this.groupBox1.Controls.Add(this.restoreExtensionName);
             this.groupBox1.Controls.Add(this.assetGroupOptions);
@@ -108,12 +110,24 @@
             this.groupBox1.TabStop = false;
             this.groupBox1.Text = "Export";
             // 
+            // exportSpriteWithAlphaMask
+            // 
+            this.exportSpriteWithAlphaMask.AutoSize = true;
+            this.exportSpriteWithAlphaMask.Checked = true;
+            this.exportSpriteWithAlphaMask.CheckState = System.Windows.Forms.CheckState.Checked;
+            this.exportSpriteWithAlphaMask.Location = new System.Drawing.Point(6, 150);
+            this.exportSpriteWithAlphaMask.Name = "exportSpriteWithAlphaMask";
+            this.exportSpriteWithAlphaMask.Size = new System.Drawing.Size(205, 17);
+            this.exportSpriteWithAlphaMask.TabIndex = 11;
+            this.exportSpriteWithAlphaMask.Text = "Export sprites with alpha mask applied";
+            this.exportSpriteWithAlphaMask.UseVisualStyleBackColor = true;
+            // 
             // openAfterExport
             // 
             this.openAfterExport.AutoSize = true;
             this.openAfterExport.Checked = true;
             this.openAfterExport.CheckState = System.Windows.Forms.CheckState.Checked;
-            this.openAfterExport.Location = new System.Drawing.Point(6, 173);
+            this.openAfterExport.Location = new System.Drawing.Point(6, 196);
             this.openAfterExport.Name = "openAfterExport";
             this.openAfterExport.Size = new System.Drawing.Size(137, 17);
             this.openAfterExport.TabIndex = 10;
@@ -160,7 +174,7 @@
             this.convertAudio.AutoSize = true;
             this.convertAudio.Checked = true;
             this.convertAudio.CheckState = System.Windows.Forms.CheckState.Checked;
-            this.convertAudio.Location = new System.Drawing.Point(6, 150);
+            this.convertAudio.Location = new System.Drawing.Point(6, 173);
             this.convertAudio.Name = "convertAudio";
             this.convertAudio.Size = new System.Drawing.Size(179, 17);
             this.convertAudio.TabIndex = 6;
@@ -531,5 +545,6 @@
         private System.Windows.Forms.CheckBox openAfterExport;
         private System.Windows.Forms.CheckBox exportAllUvsAsDiffuseMaps;
         private System.Windows.Forms.ToolTip exportUvsTooltip;
+        private System.Windows.Forms.CheckBox exportSpriteWithAlphaMask;
     }
 }

AssetStudioGUI/ExportOptions.cs

@@ -12,6 +12,7 @@ namespace AssetStudioGUI
             assetGroupOptions.SelectedIndex = Properties.Settings.Default.assetGroupOption;
             restoreExtensionName.Checked = Properties.Settings.Default.restoreExtensionName;
             converttexture.Checked = Properties.Settings.Default.convertTexture;
+            exportSpriteWithAlphaMask.Checked = Properties.Settings.Default.exportSpriteWithMask;
             convertAudio.Checked = Properties.Settings.Default.convertAudio;
             var str = Properties.Settings.Default.convertType.ToString();
             foreach (Control c in panel1.Controls)
@@ -43,6 +44,7 @@ namespace AssetStudioGUI
             Properties.Settings.Default.assetGroupOption = assetGroupOptions.SelectedIndex;
             Properties.Settings.Default.restoreExtensionName = restoreExtensionName.Checked;
             Properties.Settings.Default.convertTexture = converttexture.Checked;
+            Properties.Settings.Default.exportSpriteWithMask = exportSpriteWithAlphaMask.Checked;
             Properties.Settings.Default.convertAudio = convertAudio.Checked;
             foreach (Control c in panel1.Controls)
             {
@@ -75,6 +77,5 @@ namespace AssetStudioGUI
             DialogResult = DialogResult.Cancel;
             Close();
         }
-
     }
 }

AssetStudioGUI/ExportOptions.resx

@@ -120,7 +120,4 @@
   <metadata name="exportUvsTooltip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>17, 17</value>
   </metadata>
-  <metadata name="exportUvsTooltip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
-    <value>17, 17</value>
-  </metadata>
 </root>

AssetStudioGUI/Exporter.cs

@@ -231,9 +231,10 @@ namespace AssetStudioGUI
         public static bool ExportSprite(AssetItem item, string exportPath)
         {
             var type = Properties.Settings.Default.convertType;
+            var alphaMask = Properties.Settings.Default.exportSpriteWithMask ? SpriteMaskMode.On : SpriteMaskMode.Off;
             if (!TryExportFile(exportPath, item, "." + type.ToString().ToLower(), out var exportFullPath))
                 return false;
-            var image = ((Sprite)item.Asset).GetImage();
+            var image = ((Sprite)item.Asset).GetImage(alphaMask);
             if (image != null)
             {
                 using (image)

AssetStudioGUI/Properties/Settings.Designer.cs

@@ -1,10 +1,10 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
-//     此代码由工具生成。
-//     运行时版本:4.0.30319.42000
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
 //
-//     对此文件的更改可能会导致不正确的行为，并且如果
-//     重新生成代码，这些更改将会丢失。
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
 // </auto-generated>
 //------------------------------------------------------------------------------
 
@@ -12,7 +12,7 @@ namespace AssetStudioGUI.Properties {
     
     
     [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "16.10.0.0")]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "17.1.0.0")]
     internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
         
         private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
@@ -274,5 +274,17 @@ namespace AssetStudioGUI.Properties {
                 this["exportAllUvsAsDiffuseMaps"] = value;
             }
         }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("True")]
+        public bool exportSpriteWithMask {
+            get {
+                return ((bool)(this["exportSpriteWithMask"]));
+            }
+            set {
+                this["exportSpriteWithMask"] = value;
+            }
+        }
     }
 }

AssetStudioGUI/Properties/Settings.settings

@@ -65,5 +65,8 @@
     <Setting Name="exportAllUvsAsDiffuseMaps" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">False</Value>
     </Setting>
+    <Setting Name="exportSpriteWithMask" Type="System.Boolean" Scope="User">
+      <Value Profile="(Default)">True</Value>
+    </Setting>
   </Settings>
 </SettingsFile>

AssetStudioUtility/SpriteHelper.cs

@@ -11,9 +11,16 @@ using System.Numerics;
 
 namespace AssetStudio
 {
+    public enum SpriteMaskMode
+    {
+        Off,
+        On,
+        MaskOnly
+    }
+
     public static class SpriteHelper
     {
-        public static Image<Bgra32> GetImage(this Sprite m_Sprite)
+        public static Image<Bgra32> GetImage(this Sprite m_Sprite, SpriteMaskMode spriteMaskVisibleMode = SpriteMaskMode.On)
         {
             if (m_Sprite.m_SpriteAtlas != null && m_Sprite.m_SpriteAtlas.TryGet(out var m_SpriteAtlas))
             {
@@ -24,7 +31,26 @@ namespace AssetStudio
             }
             else
             {
-                if (m_Sprite.m_RD.texture.TryGet(out var m_Texture2D))
+                if (m_Sprite.m_RD.texture.TryGet(out var m_Texture2D) && m_Sprite.m_RD.alphaTexture.TryGet(out var m_AlphaTexture2D) && spriteMaskVisibleMode != SpriteMaskMode.Off)
+                {
+                    var tex = CutImage(m_Sprite, m_Texture2D, m_Sprite.m_RD.textureRect, m_Sprite.m_RD.textureRectOffset, m_Sprite.m_RD.downscaleMultiplier, m_Sprite.m_RD.settingsRaw);
+                    var alphaTex = CutImage(m_Sprite, m_AlphaTexture2D, m_Sprite.m_RD.textureRect, m_Sprite.m_RD.textureRectOffset, m_Sprite.m_RD.downscaleMultiplier, m_Sprite.m_RD.settingsRaw);
+
+                    if (tex.Width != alphaTex.Width || tex.Height != alphaTex.Height)
+                    {
+                        alphaTex.Mutate(x => x.Resize(tex.Width, tex.Height));
+                    }
+
+                    switch (spriteMaskVisibleMode)
+                    {
+                        case SpriteMaskMode.On:
+                            return ApplyRGBMask(tex, alphaTex);
+                        case SpriteMaskMode.MaskOnly:
+                            tex.Dispose();
+                            return alphaTex;
+                    }
+                }
+                else if (m_Sprite.m_RD.texture.TryGet(out m_Texture2D))
                 {
                     return CutImage(m_Sprite, m_Texture2D, m_Sprite.m_RD.textureRect, m_Sprite.m_RD.textureRectOffset, m_Sprite.m_RD.downscaleMultiplier, m_Sprite.m_RD.settingsRaw);
                 }
@@ -32,6 +58,28 @@ namespace AssetStudio
             return null;
         }
 
+        private static Image<Bgra32> ApplyRGBMask(Image<Bgra32> tex, Image<Bgra32> texMask)
+        {
+            using (texMask)
+            {
+                tex.ProcessPixelRows(texMask, (sourceTex, targetTexMask) =>
+                {
+                    for (int y = 0; y < texMask.Height; y++)
+                    {
+                        var texRow = sourceTex.GetRowSpan(y);
+                        var maskRow = targetTexMask.GetRowSpan(y);
+                        for (int x = 0; x < maskRow.Length; x++)
+                        {
+                            var grayscale = (byte)((maskRow[x].R + maskRow[x].G + maskRow[x].B) / 3);
+                            texRow[x].A = grayscale;
+                        }
+                    }
+                });
+
+                return tex;
+            }
+        }
+
         private static Image<Bgra32> CutImage(Sprite m_Sprite, Texture2D m_Texture2D, Rectf textureRect, Vector2 textureRectOffset, float downscaleMultiplier, SpriteSettings settingsRaw)
         {
             var originalImage = m_Texture2D.ConvertToImage(false);