monogame dynamic draw font, using SharpFont, and cache with texture2d

MonoGameFontUtil.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using SharpFont;


namespace MonoFont
{
    static class FontUtil
    {
        public static string FontPath = @".\Content\font.ttc";

        private static Library library;

        public static Face FontDefault;

        private static Dictionary<string, Face> fontCache = new Dictionary<string, Face>();


        public static Face RequestFace(byte sizeX, byte sizeY)
        {
            return RequestFace(FontPath, sizeX, sizeY);
        }

        public static Face RequestFace(byte size)
        {
            return RequestFace(size, size);
        }

        public static Face RequestFace(string path, byte size)
        {
            return RequestFace(path, size, size);
        }

        public static Face RequestFace(string path, byte sizeX, byte sizeY)
        {
            var key = path + (sizeX << 8 | sizeY);
            if (!fontCache.TryGetValue(key, out var font))
            {
                font = library.NewFace(path, 0);
                font.SetCharSize(Fixed26Dot6.FromInt32(sizeX), Fixed26Dot6.FromInt32(sizeY), 0, 0);
                font.SetTransform();
                fontCache.Add(key, font);
            }

            return font;
        }

        public static void Init(GraphicsDevice device)
        {
            library = new Library();
            FontDefault = RequestFace(FontPath, 14, 14);
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        private struct FontDesc : IEquatable<FontDesc>
        {
            private readonly string fontFamily;

            private readonly float fontSize;

            public FontDesc(string fontFamily, int fontSize)
            {
                this.fontFamily = fontFamily;
                this.fontSize = fontSize;
            }

            public FontDesc(Face font)
            {
                this.fontFamily = font.FamilyName;
                this.fontSize = font.Size.Metrics.NominalHeight;
            }

            public bool Equals(FontDesc other)
            {
                return string.Equals(fontFamily, other.fontFamily) && Math.Abs(fontSize - other.fontSize) < 0.01;
            }

            public override bool Equals(object obj)
            {
                if (ReferenceEquals(null, obj)) return false;
                return obj is FontDesc && Equals((FontDesc)obj);
            }

            public override int GetHashCode()
            {
                unchecked
                {
                    return ((fontFamily != null ? fontFamily.GetHashCode() : 0) * 397) ^ fontSize.GetHashCode();
                }
            }

            public static bool operator ==(FontDesc left, FontDesc right)
            {
                return left.Equals(right);
            }

            public static bool operator !=(FontDesc left, FontDesc right)
            {
                return !left.Equals(right);
            }
        }

        private static List<TextureCache> textures = new List<TextureCache>();

        private static Dictionary<FontDesc, Dictionary<char, CharCache>> caches = new Dictionary<FontDesc, Dictionary<char, CharCache>>();

        public static void Preload(GraphicsDevice device, string text, SharpFont.Face font)
        {
            var fontDesc = new FontDesc(font);
            if (!caches.TryGetValue(fontDesc, out var dic2))
            {
                caches.Add(fontDesc, dic2 = new Dictionary<char, CharCache>());
            }

            foreach (var s in text)
            {
                if (!dic2.TryGetValue(s, out var cache))
                {
                    cache = BuildCache(device, s, font);
                    dic2.Add(s, cache);
                }
            }
        }

        public static void DrawStringEx(this SpriteBatch batch, string text, SharpFont.Face font, Color color, int x, int y, int width)
        {
            batch.DrawStringEx(text, font, color, x, y, width, null);
        }

        public static void DrawStringEx(this SpriteBatch batch, string text, SharpFont.Face font, Color color, Point position, int width)
        {
            batch.DrawStringEx(text, font, color, position.X, position.Y, width, null);
        }

        public static void DrawStringEx(this SpriteBatch batch, string text, SharpFont.Face font, Color color, int x, int y)
        {
            batch.DrawStringEx(text, font, color, x, y, null, null);
        }

        public static void DrawStringEx(this SpriteBatch batch, string text, SharpFont.Face font, Color color, Point position)
        {
            batch.DrawStringEx(text, font, color, position.X, position.Y, null, null);
        }

        public static void DrawStringEx(this SpriteBatch batch, string text, SharpFont.Face font, Color color, Rectangle rectangle)
        {
            batch.DrawStringEx(text, font, color, rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);
        }

        static void DrawCounted(SpriteBatch batch, ref CharCache cache, ref Color color, ref int x, ref int y, ref int countX1, ref int offsetY1, ref int offsetX1)
        {
            var rectangle = cache.Rectangle;
            rectangle.Width = countX1;
            batch.Draw(cache.Texture, new Vector2(offsetX1 + x, offsetY1 + y), rectangle, color);
            offsetX1 += countX1;
            countX1 = 0;
            cache = null;
        }

        public static void DrawStringEx(this SpriteBatch batch, string text, SharpFont.Face font, Color color, int x, int y, int? width, int? height)
        {
            var fontDesc = new FontDesc(font);
            if (!caches.TryGetValue(fontDesc, out var dic2))
            {
                caches.Add(fontDesc, dic2 = new Dictionary<char, CharCache>());
            }

            var warpLine = width.HasValue;
            int offsetX = 0;
            int offsetY = 0;
            width = width ?? batch.GraphicsDevice.Viewport.Width;
            height = (height ?? batch.GraphicsDevice.Viewport.Height) - y;
            int countX = 0;
            var textLength = text.Length;
            char pre = '\0';
            CharCache headCache = null;
            for (var i = 0; i < textLength; i++)
            {
                var ch = text[i];
                if (!dic2.TryGetValue(ch, out var cache))
                {
                    cache = BuildCache(batch.GraphicsDevice, ch, font);
                    dic2.Add(ch, cache);
                }

                if (warpLine && offsetX + cache.Rectangle.Width + countX > width || ch == '\n')
                {
                    if (countX > 0)
                    {
                        DrawCounted(batch, ref headCache, ref color, ref x, ref y, ref countX, ref offsetY, ref offsetX);
                    }

                    offsetY += cache.Rectangle.Height;
                    offsetX = 0;
                }

                if (ch == '\n' || ch == '\r')
                {
                    continue;
                }

                if (offsetY > height)
                {
                    return;
                }

                if (!warpLine && offsetX > width)
                {
                    return;
                }

                if (cache.Pre == pre)
                {
                    countX += cache.Rectangle.Width;
                    if (headCache == null)
                    {
                        headCache = cache;
                    }
                }
                else
                {
                    if (countX > 0)
                    {
                        DrawCounted(batch, ref headCache, ref color, ref x, ref y, ref countX, ref offsetY, ref offsetX);
                    }

                    batch.Draw(cache.Texture, new Vector2(offsetX + x, offsetY + y), cache.Rectangle, color);
                    offsetX += cache.Rectangle.Width;
                }

                pre = ch;
            }
        }

        private class TextureCache
        {
            public FontDesc FontDesc;

            private int Count;

            private List<char> chars = new List<char>(1024);

            private Texture2D Texture;

            private int x;

            private int y;

            public bool full;

            private static int Width = 1024;

            private static int Height = 1024;


            public CharCache AddChar(char ch, Face font, FontDesc fontDesc)
            {
                var charIndex = font.GetCharIndex(ch);
                font.LoadGlyph(charIndex, LoadFlags.Default, LoadTarget.Normal);
                using (var glyph = font.Glyph.GetGlyph())
                {
                    glyph.ToBitmap(RenderMode.Normal, new FTVector26Dot6(0, 0), true);

                    using (var bitmapGlyph = glyph.ToBitmapGlyph())
                    {
                        var cache = this;

                        if (x + glyph.Advance.X.Ceiling() >= Width)
                        {
                            y += font.Size.Metrics.Height.Ceiling();
                            x = 0;
                        }

                        if (y >= Height - font.Size.Metrics.Height.Ceiling())
                        {
                            full = true;
                            cache = new TextureCache(Texture.GraphicsDevice, fontDesc);
                            textures.Add(cache);
                        }

                        return cache.AddChar(ch, font, glyph, bitmapGlyph);
                    }
                }
            }

            private static ushort[] buffer = new ushort[1024];

            public TextureCache(GraphicsDevice device, FontDesc fontDesc)
            {
                FontDesc = fontDesc;
                switch (device.GraphicsProfile)
                {
                    case GraphicsProfile.HiDef:
                        Height = Width = 2048;
                        break;
                    case GraphicsProfile.Reach:
                        Width = 2048;
                        Height = 1024;
                        break;
                }

                Texture = new Texture2D(device, Width, Height, false, SurfaceFormat.Bgra4444);
            }

            private CharCache AddChar(char ch, Face font, Glyph glyph, BitmapGlyph bitmapGlyph)
            {
                Count++;
                chars.Add(ch);
                if (!(bitmapGlyph.Bitmap.Width == 0 || bitmapGlyph.Bitmap.Rows == 0))
                {
                    var cBox = glyph.GetCBox(GlyphBBoxMode.Pixels);
                    var bearingY = font.Glyph.Metrics.VerticalAdvance.Ceiling();
                    var rectangle = new Rectangle(x + cBox.Left, y + (bearingY - cBox.Top), bitmapGlyph.Bitmap.Width, bitmapGlyph.Bitmap.Rows);
                    var dataLength = bitmapGlyph.Bitmap.BufferData.Length;
                    if (dataLength > buffer.Length)
                    {
                        buffer = new ushort[dataLength];
                    }

                    for (int i = 0; i < dataLength; i++)
                    {
                        var c = bitmapGlyph.Bitmap.BufferData[i] >> 4;
                        buffer[i] = (ushort)((c << 4) | (c << 8) | (c << 12) | c);
                    }

//                    if (ch == '_')
//                    {
//                        rectangle.Y -= 1;
//                    }
//                    // else if (ch >= '0' && ch <= '9' || ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z' || ch == '.')
                    //else 
                    if (ch < 255 && ch != '_')
                    {
                        rectangle.Y += 1;
                    }

                    if (rectangle.X < 0)
                    {
                        rectangle.Offset(-rectangle.X, 0);
                    }

                    if (rectangle.Y < 0)
                    {
                        rectangle.Offset(0, -rectangle.Y);
                    }

                    if (glyph.Advance.X.Ceiling() != rectangle.Width)
                    {
                        rectangle.Offset(Math.Abs(rectangle.Width - glyph.Advance.X.Ceiling()) / 2, 0);
                    }

                    Texture.SetData(0, rectangle, buffer, 0, dataLength);
                }

                var advanceX = glyph.Advance.X.Ceiling();
                if (ch == '\t')
                {
                    advanceX = font.Size.Metrics.NominalWidth * 2;
                }

                var cache = new CharCache()
                {
                    Rectangle = new Rectangle(x, y, advanceX, font.Size.Metrics.Height.Ceiling()),
                    Texture = Texture,
                    Index = Count - 1,
                    Pre = chars.Count > 1 ? chars[Count - 2] : (char?)null,
                };
                x += advanceX;
                return cache;
            }
        }

        private static CharCache BuildCache(GraphicsDevice device, char ch, Face font)
        {
            var fontDesc = new FontDesc(font);
            var textureCache = textures.FirstOrDefault(c => !c.full && c.FontDesc == fontDesc);
            if (textureCache == null)
            {
                textureCache = new TextureCache(device, fontDesc);
                textures.Add(textureCache);
            }

            return textureCache.AddChar(ch, font, fontDesc);
        }
    }
}