diff --git a/Quik.FreeType/FreeTypeFont.cs b/Quik.FreeType/FreeTypeFont.cs
index d34de5b..1c2ad34 100644
--- a/Quik.FreeType/FreeTypeFont.cs
+++ b/Quik.FreeType/FreeTypeFont.cs
@@ -40,7 +40,7 @@ namespace Quik.FreeType
             return FT.GetCharIndex(_face, (ulong)character) != 0;
         }
 
-        public override void GetCharacter(int character, out IQuikTexture texture, out QuikGlyph glyph)
+        public override void GetCharacter(int character, out QuikTexture texture, out QuikGlyph glyph)
         {
             GlyphEntry entry;
 
@@ -102,7 +102,7 @@ namespace Quik.FreeType
 
         private class Atlas : IDisposable
         {
-            public IQuikTexture Texture;
+            public QuikTexture Texture;
 
             private QuikVec2 _pointer = new QuikVec2();
             private float _verticalAdvance = 0;
diff --git a/Quik.OpenTK/OpenGLTexture.cs b/Quik.OpenTK/OpenGLTexture.cs
index 8712469..2b96ed4 100644
--- a/Quik.OpenTK/OpenGLTexture.cs
+++ b/Quik.OpenTK/OpenGLTexture.cs
@@ -3,17 +3,21 @@ using OpenTK.Graphics.OpenGL4;
 
 namespace Quik.OpenTK
 {
-    public class OpenGLTexture : IQuikTexture
+    public class OpenGLTexture : QuikTexture
     {
         public int TextureId { get; private set; }
         private OpenGLTextureManager Manager { get; }
 
+        private int _width;
+        private int _height;
+        private bool _mipmaps;
+
         internal OpenGLTexture(OpenGLTextureManager manager, QuikImageFormat format, QuikVec2 size, bool mipmaps)
         {
             Manager = manager;
-            Mipmaps = mipmaps;
-            Width = (int)size.X;
-            Height = (int)size.Y;
+            _mipmaps = mipmaps;
+            _width = (int)size.X;
+            _height = (int)size.Y;
 
             TextureId = GL.GenTexture();
 
@@ -40,29 +44,26 @@ namespace Quik.OpenTK
         }
 
         /// <inheritdoc />
-        public bool Equals(IQuikTexture other) =>
+        public override bool Equals(QuikTexture other) =>
             other is OpenGLTexture && ((OpenGLTexture)other).TextureId == TextureId;
 
         private bool _isDisposed = false;
-        private void Dispose(bool disposing)
+        protected override void Dispose(bool disposing)
         {
             if (_isDisposed) return;
             Manager?.Reclaim(this);
             _isDisposed = true;
         }
-        
-        /// <inheritdoc />
-        public void Dispose() => Dispose(true);
 
         /// <inheritdoc />
-        public int Width { get; }
+        public override int Width => _width;
         /// <inheritdoc />
-        public int Height { get; }
+        public override int Height => _height;
         /// <inheritdoc />
-        public bool Mipmaps { get; }
+        public override bool Mipmaps => _mipmaps;
 
         /// <inheritdoc />
-        public void Image(IntPtr data, QuikImageFormat format, QuikVec2 size, int level, int alignment = 4)
+        public override void Image(IntPtr data, QuikImageFormat format, QuikVec2 size, int level, int alignment = 4)
         {
             GL.BindTexture(TextureTarget.Texture2D, TextureId);
             GL.PixelStore(PixelStoreParameter.UnpackAlignment, alignment);
@@ -70,7 +71,7 @@ namespace Quik.OpenTK
         }
 
         /// <inheritdoc />
-        public void SubImage(IntPtr data, QuikImageFormat format, QuikRectangle location, int level, int alignment = 4)
+        public override void SubImage(IntPtr data, QuikImageFormat format, QuikRectangle location, int level, int alignment = 4)
         {
             GL.BindTexture(TextureTarget.Texture2D, TextureId);
             GL.PixelStore(PixelStoreParameter.UnpackAlignment, alignment);
@@ -87,7 +88,7 @@ namespace Quik.OpenTK
         }
 
         /// <inheritdoc />
-        public void GenerateMipMaps()
+        public override void GenerateMipMaps()
         {
             GL.BindTexture(TextureTarget.Texture2D, TextureId);
             GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);            
diff --git a/Quik.OpenTK/OpenGLTextureManager.cs b/Quik.OpenTK/OpenGLTextureManager.cs
index 5c8374e..3ff73cc 100644
--- a/Quik.OpenTK/OpenGLTextureManager.cs
+++ b/Quik.OpenTK/OpenGLTextureManager.cs
@@ -9,7 +9,7 @@ namespace Quik.OpenTK
 
         private List<int> _reclaimList = new List<int>();
 
-        public IQuikTexture CreateTexture(QuikVec2 size, bool mipmaps, QuikImageFormat format)
+        public QuikTexture CreateTexture(QuikVec2 size, bool mipmaps, QuikImageFormat format)
         {
             return new OpenGLTexture(this, format, size, mipmaps);
         }
diff --git a/Quik/CommandQueue/CommandQueue.cs b/Quik/CommandQueue/CommandQueue.cs
index 843fd72..7368e6f 100644
--- a/Quik/CommandQueue/CommandQueue.cs
+++ b/Quik/CommandQueue/CommandQueue.cs
@@ -199,7 +199,7 @@ namespace Quik.CommandQueue
             }
         }
 
-        public void Image(IQuikTexture texture, in QuikRectangle rectangle)
+        public void Image(QuikTexture texture, in QuikRectangle rectangle)
         {
             Enqueue(Command.Image);
             Enqueue((Frame)(int)ImageCommandFlags.Single);
@@ -207,7 +207,7 @@ namespace Quik.CommandQueue
             Enqueue(rectangle);
         }
 
-        public void Image(IQuikTexture texture, in QuikRectangle rectangle, in QuikRectangle uv)
+        public void Image(QuikTexture texture, in QuikRectangle rectangle, in QuikRectangle uv)
         {
             Enqueue(Command.Image);
             Enqueue((Frame)(int)(ImageCommandFlags.Single | ImageCommandFlags.UVs));
@@ -216,7 +216,7 @@ namespace Quik.CommandQueue
             Enqueue(uv);
         }
 
-        public void Image(IQuikTexture texture, QuikRectangle[] rectangles, bool interleavedUV = false)
+        public void Image(QuikTexture texture, QuikRectangle[] rectangles, bool interleavedUV = false)
         {
             ImageCommandFlags flags = interleavedUV ? ImageCommandFlags.UVs : ImageCommandFlags.None;
 
@@ -230,7 +230,7 @@ namespace Quik.CommandQueue
             }
         }
 
-        public void Image(IQuikTexture texture, QuikRectangle[] rectangles, QuikRectangle[] uvs)
+        public void Image(QuikTexture texture, QuikRectangle[] rectangles, QuikRectangle[] uvs)
         {
             int count = Math.Min(rectangles.Length, uvs.Length);
             Enqueue(Command.Image);
diff --git a/Quik/IQuikTexture.cs b/Quik/IQuikTexture.cs
index 98bb9ec..5533565 100644
--- a/Quik/IQuikTexture.cs
+++ b/Quik/IQuikTexture.cs
@@ -5,22 +5,28 @@ namespace Quik
     /// <summary>
     /// Interface for texture instances.
     /// </summary>
-    public interface IQuikTexture : IEquatable<IQuikTexture>, IDisposable
+    public abstract class QuikTexture : IEquatable<QuikTexture>, IDisposable
     {
         /// <summary>
         /// Width of the texture.
         /// </summary>
-        int Width { get; }
-        
+        public abstract int Width { get; }
+
         /// <summary>
         /// Height of the texture.
         /// </summary>
-        int Height { get; }
-        
+        public abstract int Height { get; }
+
         /// <summary>
         /// True if the texture can have mipmaps.
         /// </summary>
-        bool Mipmaps { get; }
+        public abstract bool Mipmaps { get; }
+
+        /// <summary>
+        /// Indicates whether this texture contains a signed distance field.
+        /// </summary>
+        /// <value></value>
+        public bool SignedDistanceField { get; set; }
 
         /// <summary>
         /// Upload texture data.
@@ -30,8 +36,8 @@ namespace Quik
         /// <param name="size">Size of the texture data.</param>
         /// <param name="level">Mip level.</param>
         /// <param name="alignment">Pixel alignment. Expected to be 1, 2, 4, or 8.</param>
-        void Image(IntPtr data, QuikImageFormat format, QuikVec2 size, int level, int alignment = 4);
-        
+        public abstract void Image(IntPtr data, QuikImageFormat format, QuikVec2 size, int level, int alignment = 4);
+
         /// <summary>
         /// Upload texture data.
         /// </summary>
@@ -40,11 +46,19 @@ namespace Quik
         /// <param name="location">Location of the data in the texture.</param>
         /// <param name="level">Mip level.</param>
         /// <param name="alignment">Pixel alignment. Expected to be 1, 2, 4, or 8.</param>
-        void SubImage(IntPtr data, QuikImageFormat format, QuikRectangle location, int level, int alignment = 4);
-        
+        public abstract void SubImage(IntPtr data, QuikImageFormat format, QuikRectangle location, int level, int alignment = 4);
+
         /// <summary>
         /// Generate the mip maps for the texture.
         /// </summary>
-        void GenerateMipMaps();
+        public abstract void GenerateMipMaps();
+
+        public virtual bool Equals(QuikTexture other)
+        {
+            return base.Equals(other);
+        }
+
+        public void Dispose() => Dispose(true);
+        protected virtual void Dispose(bool isDisposing) { }
     }
 }
\ No newline at end of file
diff --git a/Quik/IQuikTextureManager.cs b/Quik/IQuikTextureManager.cs
index 2439be6..64ff7ef 100644
--- a/Quik/IQuikTextureManager.cs
+++ b/Quik/IQuikTextureManager.cs
@@ -21,7 +21,7 @@ namespace Quik
         /// All parameters are hints. If there is a situation where the texture does not
         /// have mip levels, or format cannot be specified, ignore these parameters.
         /// </remarks>
-        IQuikTexture CreateTexture(QuikVec2 size, bool mipmaps, QuikImageFormat format);
+        QuikTexture CreateTexture(QuikVec2 size, bool mipmaps, QuikImageFormat format);
         
         /// <summary>
         /// A function called on context clear. (useful for discarding old textures)
diff --git a/Quik/QuikStyle.cs b/Quik/QuikStyle.cs
index 9c5ba7e..5b1e436 100644
--- a/Quik/QuikStyle.cs
+++ b/Quik/QuikStyle.cs
@@ -108,9 +108,9 @@ namespace Quik
             set => this["list-marker-position"] = value;
         }
 
-        public IQuikTexture ListMarkerImage
+        public QuikTexture ListMarkerImage
         {
-            get => (IQuikTexture)this["list-marker-image"];
+            get => (QuikTexture)this["list-marker-image"];
             set => this["list-marker-image"] = value;
         }
 
diff --git a/Quik/Typography/QuikFont.cs b/Quik/Typography/QuikFont.cs
index 44636f6..27d6990 100644
--- a/Quik/Typography/QuikFont.cs
+++ b/Quik/Typography/QuikFont.cs
@@ -12,6 +12,6 @@ namespace Quik.Typography
         public abstract float Descender { get; }
 
         public abstract bool HasCharacter(int character);
-        public abstract void GetCharacter(int character, out IQuikTexture texture, out QuikGlyph glyph);
+        public abstract void GetCharacter(int character, out QuikTexture texture, out QuikGlyph glyph);
     }
 }
\ No newline at end of file
diff --git a/Quik/Typography/TextLayout.cs b/Quik/Typography/TextLayout.cs
index 1c7490c..392399e 100644
--- a/Quik/Typography/TextLayout.cs
+++ b/Quik/Typography/TextLayout.cs
@@ -280,7 +280,7 @@ namespace Quik.Typography
                     for (int i = block.Text.Length - 1; i >= 0; i--)
                     {
                         char chr = block.Text[i];
-                        block.Font.GetCharacter(chr, out IQuikTexture texture, out QuikGlyph metrics);
+                        block.Font.GetCharacter(chr, out QuikTexture texture, out QuikGlyph metrics);
                         group.Add(
                             new TypesetCharacter(
                                 chr,
@@ -301,7 +301,7 @@ namespace Quik.Typography
                     for (int i = 0; i < block.Text.Length; i++)
                     {
                         char chr = block.Text[i];
-                        block.Font.GetCharacter(chr, out IQuikTexture texture, out QuikGlyph metrics);
+                        block.Font.GetCharacter(chr, out QuikTexture texture, out QuikGlyph metrics);
                         group.Add(
                             new TypesetCharacter(
                                 chr,
@@ -352,13 +352,13 @@ namespace Quik.Typography
     public struct TypesetCharacter
     {
         public int Character;
-        public IQuikTexture Texture;
+        public QuikTexture Texture;
         public QuikRectangle Position;
         public QuikRectangle UV;
 
         public TypesetCharacter(
             int chr,
-            IQuikTexture texture,
+            QuikTexture texture,
             in QuikRectangle position,
             in QuikRectangle uv)
         {
diff --git a/Quik/VertexGenerator/QuikVertexGenerator.cs b/Quik/VertexGenerator/QuikVertexGenerator.cs
index 4405125..d04268a 100644
--- a/Quik/VertexGenerator/QuikVertexGenerator.cs
+++ b/Quik/VertexGenerator/QuikVertexGenerator.cs
@@ -1411,7 +1411,7 @@ namespace Quik.VertexGenerator
 
         private void RenderCharacter(QuikCommandPutChar chr)
         {
-            Context.DefaultFont.GetCharacter(chr.Character, out IQuikTexture texture, out QuikGlyph metrics);
+            Context.DefaultFont.GetCharacter(chr.Character, out QuikTexture texture, out QuikGlyph metrics);
 
             QuikVertex a, b, c, d;
             a = b = c = d = new QuikVertex() {Color = new QuikColor(0xffffffff)};
@@ -1445,14 +1445,14 @@ namespace Quik.VertexGenerator
             QuikFont font = Context.DefaultFont;
             QuikVertex vertex = new QuikVertex() {Color = new QuikColor(0x000000ff)};
             QuikVec2 pointer = text.Position;
-            IQuikTexture texture = null;
+            QuikTexture texture = null;
             
             for (int i = 0; i < text.Text.Length; i++)
             {
                 int chr = text.Text[i];
                 QuikGlyph metrics;
 
-                IQuikTexture ntex;
+                QuikTexture ntex;
                 font.GetCharacter(chr, out ntex, out metrics);
 
                 if (ntex != texture && texture != null)
@@ -1502,7 +1502,7 @@ namespace Quik.VertexGenerator
             short startElement = (short)_elementBufferPointer;
             TypesetGroup group = text.Group;
             QuikVertex vertex = new QuikVertex() { Color = new QuikColor(0x000000ff) };
-            IQuikTexture texture = null;
+            QuikTexture texture = null;
 
             group.SortBy(TypesetGroup.SortByTexture);
             foreach (TypesetCharacter chr in group)
@@ -1569,6 +1569,6 @@ namespace Quik.VertexGenerator
         public short Count;
         public QuikRectangle Bounds;
         public bool ClearStencil;
-        public IQuikTexture Texture;
+        public QuikTexture Texture;
     }
 }
\ No newline at end of file
diff --git a/QuikTestApplication/TestFont.cs b/QuikTestApplication/TestFont.cs
index 1470e72..46196a6 100644
--- a/QuikTestApplication/TestFont.cs
+++ b/QuikTestApplication/TestFont.cs
@@ -20,7 +20,7 @@ namespace QuikTestApplication
         public static byte[] TextureData { get; private set; } = Array.Empty<byte>();
         public static QuikVec2 TextureSize { get; private set; }
 
-        public IQuikTexture Texture { get; }
+        public QuikTexture Texture { get; }
 
         public override float Ascender => throw new NotImplementedException();
 
@@ -113,7 +113,7 @@ namespace QuikTestApplication
             return _characters.Contains((char) character);
         }
 
-        public override void GetCharacter(int character, out IQuikTexture texture, out QuikGlyph glyph)
+        public override void GetCharacter(int character, out QuikTexture texture, out QuikGlyph glyph)
         {
             if (!_glyphs.TryGetValue(character, out glyph))
             {