move mesh generate logic into canvas

Assets/UIWidgets/Tests/Paragraph.cs

                     new List<TextSpan>()
                     {
                         new TextSpan("Real-time 3D revolutionizes:\n the animation pipeline.\n\n\nrevolutionizesn\n\nReal-time 3D revolutionizes the animation pipeline ", null),
-                    })), 200, 80);
+                    }), maxLines: 3), 200, 80);
         }
         
         RenderBox textHeight()

Assets/UIWidgets/rendering/proxy_box.cs

             return hitTarget;
         }
 
-        public override bool hitTestSelf(Offset position) {
+        protected override bool hitTestSelf(Offset position) {
             return this.behavior == HitTestBehavior.opaque;
         }
     }

Assets/UIWidgets/ui/painting/canvas.cs

 using UIWidgets.painting;
+using UIWidgets.ui.txt;
 using UnityEngine;
 
 namespace UIWidgets.ui {
 
         void clipRRect(RRect rrect);
 
-        void drawMesh(IMesh mesh, Material material);
+        void drawTextBlob(TextBlob textBlob, double x, double y);
     }
 
     public class RecorderCanvas : Canvas {
             });
         }
 
-        public void drawMesh(IMesh mesh, Material material)
+        public void drawTextBlob(TextBlob textBlob, double x, double y)
-            this._recorder.addDrawCmd(new DrawMesh() {
-                mesh = mesh,
-                material = material,
+            this._recorder.addDrawCmd(new DrawTextBlob() {
+                textBlob = textBlob,
+                x = x,
+                y = y,
-}
+}

Assets/UIWidgets/ui/painting/canvas_impl.cs

 using System;
 using System.Collections.Generic;
 using UIWidgets.painting;
+using UIWidgets.ui.painting.txt;
+using UIWidgets.ui.txt;
 using UnityEditor;
 using UnityEngine;
 
                 else if (drawCmd is DrawClipRRect) {
                     var drawClipRRect = (DrawClipRRect) drawCmd;
                     this.clipRRect(drawClipRRect.rrect);
-                } else if (drawCmd is DrawMesh) {
-                    var drawMesh = (DrawMesh) drawCmd;
-                    this.drawMesh(drawMesh.mesh, drawMesh.material);
+                } else if (drawCmd is DrawTextBlob) {
+                    var drawTextBlob = (DrawTextBlob) drawCmd;
+                    this.drawTextBlob(drawTextBlob.textBlob, drawTextBlob.x, drawTextBlob.y);
                 } else {
                     throw new Exception("unknown drawCmd: " + drawCmd);
                 }
             this.pushClipRRect(rect, this._transform);
         }
 
-        public void drawMesh(IMesh mesh, Material material)
+        public void drawTextBlob(TextBlob textBlob, double x, double y)
-            prepareGL(material);
-            material.SetPass(0);
-            mesh.syncTextureUV();
-            Graphics.DrawMeshNow(mesh.mesh, Matrix4x4.identity);
+            var mesh = MeshGenrator.generateMesh(textBlob, x, y);
+            var font = FontManager.instance.getOrCreate(textBlob.style.safeFontFamily, textBlob.style.UnityFontSize);
+            prepareGL(font.material);
+            font.material.SetPass(0);
+            Graphics.DrawMeshNow(mesh, Matrix4x4.identity);
         }
 
         private void pushClipRect(Rect clipRect, Matrix4x4 transform) {
 
             GL.MultMatrix(this._transform);
         }
+//
+//        private double PixelRound(double v)
+//        {
+//            return Math.Floor(v * EditorGUIUtility.pixelsPerPoint)  EditorGUIUtility.pixelsPerPoint;
+//        }
 
         private class ClipRec {
             public ClipRec(Matrix4x4 transform, Rect rect = null, RRect rrect = null) {

Assets/UIWidgets/ui/painting/draw_cmd.cs

 using UIWidgets.painting;
+using UIWidgets.ui.txt;
-using UnityEngine.UI;
 
 namespace UIWidgets.ui {
     public interface DrawCmd {
         public RRect rrect;
     }
     
-    public class DrawMesh : DrawCmd {
-        public IMesh mesh;
-        public Material material;
-    }
-
-    public interface IMesh
+    public class DrawTextBlob : DrawCmd
-        void syncTextureUV();
+        public TextBlob textBlob;
+        public double x;
+        public double y;
+    }
-        Mesh mesh { get; }
-    }
 }
 

Assets/UIWidgets/ui/painting/picture.cs

             } else if (drawCmd is DrawClipRRect) {
                 var drawClipRRect = (DrawClipRRect) drawCmd;
                 this.addClipRect(drawClipRRect.rrect.outerRect);
-            } else if (drawCmd is DrawMesh) {
-                var bounds = ((DrawMesh)drawCmd).mesh.mesh.bounds;
-                
-                var rect = Rect.fromLTRB(bounds.min.x, bounds.min.y, bounds.max.x, bounds.max.y);
-                this.addPaintBounds(rect);
+            } else if (drawCmd is DrawTextBlob)
+            {
+                var drawTextBlob = (DrawTextBlob) drawCmd;
+                var bounds = drawTextBlob.textBlob.boundsInText.shift(new Offset(drawTextBlob.x, drawTextBlob.y));
+                this.addPaintBounds(bounds);
             } else
             {
                 throw new Exception("unknown drawCmd: " + drawCmd);

Assets/UIWidgets/ui/txt/linebreaker.cs

             {
                 runIterator.nextTo(charIndex);
                 var run = runIterator.run;
-                var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize).font;
+                var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize);
 
                 var style = run.style;
                 var charInfo = new CharacterInfo();

Assets/UIWidgets/ui/txt/paragraph.cs

 using System;
 using System.Collections.Generic;
+using UIWidgets.ui.txt;
 using UnityEngine;
 
 namespace UIWidgets.ui
         private double _ideographicBaseline;
         private double[] _characterWidths; 
         private List<double> _lineHeights = new List<double>();
+        private List<PaintRecord> _paintRecords = new List<PaintRecord>();
         private bool _didExceedMaxLines;
       
         // private double _characterWidth;
 
         public void paint(Canvas canvas, double x, double y)
         {
-            for (int runIndex = 0; runIndex < _runs.size; ++runIndex)
+            foreach (var paintRecord in _paintRecords)
-                var run = _runs.getRun(runIndex);
-                if (run.start < run.end)
-                {
-                    var fontEntry = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize);
-                    var mesh = new TextMesh(new Vector2d(x, y), _text, _characterPositions, fontEntry, run);
-                    canvas.drawMesh(mesh, fontEntry.font.material);
-                }
+                canvas.drawTextBlob(paintRecord.text, x, y);
             }
         }
         
             computeLineBreak();
 
             var maxLines = _paragraphStyle.maxLines ?? 0;
-            _didExceedMaxLines = maxLines == 0 || _lineRanges.Count <= maxLines;
+            _didExceedMaxLines = !(maxLines == 0 || _lineRanges.Count <= maxLines);
             var lineLimits = maxLines == 0 ? _lineRanges.Count : Math.Min(maxLines, _lineRanges.Count);
             layoutLines(lineLimits);
 
             _lineHeights.Clear();
             _lineRanges.Clear();
             _lineWidths.Clear();
+            _paintRecords.Clear();
             _characterWidths = new double[_text.Length];
             for (int i = 0; i < _runs.size; ++i)
             {
-                    var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize).font;
+                    var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize);
                     font.RequestCharactersInTexture(_text.Substring(run.start, run.end - run.start), 0, 
                         run.style.UnityFontStyle);
                 } 
                     var run = _runs.getRun(runIndex);
                     if (run.start < run.end && run.start < line.end && run.end > line.start)
                     {
-                        var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize).font;
+                        var font = FontManager.instance.getOrCreate(run.style.safeFontFamily, run.style.UnityFontSize);
                         var ascent = font.ascent * (run.style.height??1.0);
                         var descent = (font.lineHeight - font.ascent) * (run.style.height??1.0);
                         if (ascent > maxAscent)
                         {
                             maxDescent = descent;
                         }
+
+                        int start = Math.Max(run.start, line.start);
+                        int end = Math.Min(run.end, line.end);
+                        var width = _characterPositions[end - 1].x + _characterWidths[end - 1] -
+                                    _characterPositions[start].x;
+                        if (end > start)
+                        {
+                            var bounds = Rect.fromLTWH(0, -ascent,
+                                _characterPositions[end - 1].x + _characterWidths[end - 1] -
+                                _characterPositions[start].x,
+                                descent);
+                            _paintRecords.Add(new PaintRecord(run.style, new TextBlob(
+                                    _text, start, end, _characterPositions, run.style, bounds), 
+                                lineNumber, width));
+                        }
                     }
 
                     if (runIndex + 1 >= _runs.size)
 
             return;
 
-        }
-
-        private Mesh generateMesh(double x, double y, Font font, StyledRuns.Run run)
-        {
-            var vertices = new Vector3[_text.Length * 4];
-            var triangles = new int[_text.Length * 6];
-            var uv = new Vector2[_text.Length * 4];
-            Vector3 offset = new Vector3((float)Utils.PixelCorrectRound(x), (float)Utils.PixelCorrectRound(y), 0);
-            font.RequestCharactersInTexture(_text.Substring(run.start, run.end - run.start), 
-                run.style.UnityFontSize, run.style.UnityFontStyle);
-            for (int charIndex = run.start; charIndex < run.end; ++charIndex)
-            {
-                CharacterInfo charInfo = new CharacterInfo();
-                if (_text[charIndex] != '\n' && _text[charIndex] != '\t')
-                {
-                    font.GetCharacterInfo(_text[charIndex], out charInfo, run.style.UnityFontSize, run.style.UnityFontStyle);
-                    var position = _characterPositions[charIndex];
-                    vertices[4 * charIndex + 0] = offset + new Vector3((float)(position.x + charInfo.minX), 
-                                                      (float)(position.y - charInfo.maxY), 0);
-                    vertices[4 * charIndex + 1] = offset + new Vector3((float)(position.x + charInfo.maxX), 
-                                                      (float)(position.y - charInfo.maxY), 0);
-                    vertices[4 * charIndex + 2] = offset + new Vector3(
-                                                      (float)(position.x + charInfo.maxX), (float)(position.y - charInfo.minY), 0);
-                    vertices[4 * charIndex + 3] = offset + new Vector3(
-                                                      (float)(position.x + charInfo.minX), (float)(position.y - charInfo.minY), 0);
-                }
-                else
-                {
-                    vertices[4 * charIndex + 0] = vertices[4 * charIndex + 1] =
-                        vertices[4 * charIndex + 2] = vertices[4 * charIndex + 3] = offset;
-                } 
-
-                if (isWordSpace(_text[charIndex]) || isLineEndSpace(_text[charIndex]) || _text[charIndex] == '\t')
-                {                    
-                    uv[4 * charIndex + 0] = Vector2.zero;
-                    uv[4 * charIndex + 1] = Vector2.zero;
-                    uv[4 * charIndex + 2] = Vector2.zero;
-                    uv[4 * charIndex + 3] = Vector2.zero;
-                } else
-                {
-                    uv[4 * charIndex + 0] = charInfo.uvTopLeft;
-                    uv[4 * charIndex + 1] = charInfo.uvTopRight;
-                    uv[4 * charIndex + 2] = charInfo.uvBottomRight;
-                    uv[4 * charIndex + 3] = charInfo.uvBottomLeft;
-                }
-               
-                triangles[6 * charIndex + 0] = 4 * charIndex + 0;
-                triangles[6 * charIndex + 1] = 4 * charIndex + 1;
-                triangles[6 * charIndex + 2] = 4 * charIndex + 2;
-
-                triangles[6 * charIndex + 3] = 4 * charIndex + 0;
-                triangles[6 * charIndex + 4] = 4 * charIndex + 2;
-                triangles[6 * charIndex + 5] = 4 * charIndex + 3;
-            }
-
-//            for (var i = 0; i < vertices.Length; i++)
-//            {
-//                vertices[i].x = (float)Math.Round(vertices[i].x);
-//                vertices[i].y = (float)Math.Round(vertices[i].y);
-//            }
-
-            var mesh = new Mesh()
-            {
-                vertices = vertices,
-                triangles = triangles,
-                uv = uv
-            };
-            var colors = new UnityEngine.Color[vertices.Length];
-            for (var i = 0; i < colors.Length; i++)
-            {
-                colors[i] = run.style.UnityColor;
-            }
-
-            mesh.colors = colors;
- 
-            return mesh;
         }
 
         private double getLineXOffset(double lineTotalAdvance) {

Assets/UIWidgets/ui/painting/txt.meta

+fileFormatVersion: 2
+guid: 9438a28ff5974aac92d56928b06692ad
+timeCreated: 1536299863

Assets/UIWidgets/ui/txt/paint_record.cs

+using UIWidgets.ui.txt;
+
+namespace UIWidgets.ui
+{
+    public class PaintRecord
+    {
+        public PaintRecord(TextStyle style,  TextBlob _text,
+            int line, double runWidth)
+        {
+            this._style = style;
+            this._text = _text;
+            this._line = line;
+            this._runWidth = runWidth;
+        }
+
+        public TextBlob text
+        {
+            get { return _text; }
+        }
+
+        public TextStyle style
+        {
+            get { return _style; }
+        }
+
+        public int line
+        {
+            get { return _line; }
+        }
+
+        public double runWidth
+        {
+            get { return _runWidth; }
+        }
+
+        private  TextStyle _style;
+        private TextBlob _text;
+        private int _line;
+        private double _runWidth;
+
+    }
+}

Assets/UIWidgets/ui/txt/paint_record.cs.meta

+fileFormatVersion: 2
+guid: 2695fb8e8f284b95ad9a175da41a9101
+timeCreated: 1536300023

Assets/UIWidgets/ui/painting/txt/font_manager.cs

+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+namespace UIWidgets.ui
+{
+    
+    public class FontManager
+    {
+        private List<Font> _fonts = new List<Font>();
+        
+        public static readonly FontManager instance = new FontManager();
+        
+        public Font getOrCreate(string[] names, int fontSize)
+        {
+            var founded = _fonts.Find((font) =>
+                (
+                font.fontSize == fontSize &&
+                    (names == font.fontNames || (names != null && names.SequenceEqual(font.fontNames)))));
+            if (founded != null)
+            {
+                return founded;
+            }
+            
+            Debug.Log(string.Format("Create new Font names={0}, size={1}", names, fontSize));
+            var newFont = Font.CreateDynamicFontFromOSFont(names,
+                fontSize);
+            _fonts.Add(newFont);
+            return newFont;
+        }
+
+        public Font getOrCreate(string name, int fontSize)
+        {
+            return getOrCreate(new []{name}, fontSize);
+        }
+    }
+}

Assets/UIWidgets/ui/painting/txt/mesh_generator.cs

+using UIWidgets.ui.txt;
+using UnityEngine;
+
+namespace UIWidgets.ui.painting.txt
+{
+    public static class MeshGenrator
+    {
+        public static Mesh generateMesh(TextBlob textBlob, double x, double y)
+        {
+            var style = textBlob.style;
+            var font = FontManager.instance.getOrCreate(style.safeFontFamily, style.UnityFontSize);
+            var length = textBlob.end - textBlob.start;
+            var vertices = new Vector3[length * 4];
+            var triangles = new int[length * 6];
+            var uv = new Vector2[length * 4]; 
+            var text = textBlob.text;
+            
+            var offset = new Vector3((float)Utils.PixelCorrectRound(x), (float)Utils.PixelCorrectRound(y), 0);
+            font.RequestCharactersInTexture(textBlob.text.Substring(textBlob.start, textBlob.end - textBlob.start), 
+                style.UnityFontSize, style.UnityFontStyle);
+            for (int charIndex = 0; charIndex < length; ++charIndex)
+            {
+                var ch = text[charIndex + textBlob.start];
+                var position = textBlob.positions[charIndex + textBlob.start];
+                
+                CharacterInfo charInfo = new CharacterInfo();
+                if (Paragraph.isWordSpace(ch) || Paragraph.isLineEndSpace(ch) || ch== '\t')
+                {
+                    
+                    vertices[4 * charIndex + 0] = vertices[4 * charIndex + 1] =
+                        vertices[4 * charIndex + 2] = vertices[4 * charIndex + 3] = offset;
+                    
+                    uv[4 * charIndex + 0] = Vector2.zero;
+                    uv[4 * charIndex + 1] = Vector2.zero;
+                    uv[4 * charIndex + 2] = Vector2.zero;
+                    uv[4 * charIndex + 3] = Vector2.zero;
+                }
+                else
+                {
+                    font.GetCharacterInfo(ch, out charInfo, style.UnityFontSize, style.UnityFontStyle);
+                    vertices[4 * charIndex + 0] = offset + new Vector3((float)(position.x + charInfo.minX), 
+                                                      (float)(position.y - charInfo.maxY), 0);
+                    vertices[4 * charIndex + 1] = offset + new Vector3((float)(position.x + charInfo.maxX), 
+                                                      (float)(position.y - charInfo.maxY), 0);
+                    vertices[4 * charIndex + 2] = offset + new Vector3(
+                                                      (float)(position.x + charInfo.maxX), (float)(position.y - charInfo.minY), 0);
+                    vertices[4 * charIndex + 3] = offset + new Vector3(
+                                                      (float)(position.x + charInfo.minX), (float)(position.y - charInfo.minY), 0);
+                    
+                    uv[4 * charIndex + 0] = charInfo.uvTopLeft;
+                    uv[4 * charIndex + 1] = charInfo.uvTopRight;
+                    uv[4 * charIndex + 2] = charInfo.uvBottomRight;
+                    uv[4 * charIndex + 3] = charInfo.uvBottomLeft;
+                } 
+               
+                triangles[6 * charIndex + 0] = 4 * charIndex + 0;
+                triangles[6 * charIndex + 1] = 4 * charIndex + 1;
+                triangles[6 * charIndex + 2] = 4 * charIndex + 2;
+
+                triangles[6 * charIndex + 3] = 4 * charIndex + 0;
+                triangles[6 * charIndex + 4] = 4 * charIndex + 2;
+                triangles[6 * charIndex + 5] = 4 * charIndex + 3;
+            }
+            
+            var mesh = new Mesh()
+            {
+                vertices = vertices,
+                triangles = triangles,
+                uv = uv
+            };
+            var colors = new UnityEngine.Color[vertices.Length];
+            for (var i = 0; i < colors.Length; i++)
+            {
+                colors[i] = style.UnityColor;
+            }
+            mesh.colors = colors;
+            return mesh;
+        }
+    }
+}

Assets/UIWidgets/ui/painting/txt/mesh_generator.cs.meta

+fileFormatVersion: 2
+guid: 79c7ef33071e4ec9b28b196b3e265bfa
+timeCreated: 1536301684

Assets/UIWidgets/ui/painting/txt/text_blob.cs

+using System;
+using UnityEngine;
+
+namespace UIWidgets.ui.txt
+{
+    public class TextBlob
+    {
+        public TextBlob(string text, int start, int end, Vector2d[] positions, TextStyle style, Rect bounds)
+        {
+            Debug.Assert(start < end);
+            this.text = text;
+            this.start = start;
+            this.end = end;
+            this.positions = positions;
+            this.style = style;
+            this.bounds = bounds;
+        }
+
+        public Rect boundsInText
+        {
+            get { return bounds.shift(new Offset(positions[start].x, positions[start].y)); }    
+        }
+        
+        public readonly string text;        
+        public readonly int start;
+        public readonly int end;
+        public readonly Vector2d[] positions;
+        public readonly TextStyle style;
+        public readonly Rect bounds;  // bounds with positions[start] as origin       
+    }
+}

Assets/UIWidgets/ui/painting/txt/text_blob.cs.meta

+fileFormatVersion: 2
+guid: 8fc95fa5caea426a80f19b2d0f99955f
+timeCreated: 1536299888

Assets/UIWidgets/ui/txt/font_manager.cs

-using System;
-using System.Collections.Generic;
-using System.Linq;
-using UnityEngine;
-
-namespace UIWidgets.ui
-{
-    public class FontEntry
-    {
-        public readonly Font font;
-        private int _textureBuildVersion = 0;
-        
-        public FontEntry(Font font)
-        {
-            this.font = font;
-            
-        }
-
-        public int textureBuildVersion
-        {
-            get { return _textureBuildVersion; }
-        }
-
-        internal void onFontTextureRebuild()
-        {
-            _textureBuildVersion++;
-        }
-    }
-    
-    public class FontManager
-    {
-        private List<FontEntry> _fonts = new List<FontEntry>();
-        
-        public static readonly FontManager instance = new FontManager();
-
-        private FontManager()
-        {
-            Font.textureRebuilt += this.onFontTextureRebuilt;
-        }
-        
-        public FontEntry getOrCreate(string[] names, int fontSize)
-        {
-            var founded = _fonts.Find((font) =>
-                (
-                font.font.fontSize == fontSize &&
-                    (names == font.font.fontNames || (names != null && names.SequenceEqual(font.font.fontNames)))));
-            if (founded != null)
-            {
-                return founded;
-            }
-            
-            Debug.Log(string.Format("Create new Font names={0}, size={1}", names, fontSize));
-            var newFont = new FontEntry(Font.CreateDynamicFontFromOSFont(names,
-                fontSize));
-            _fonts.Add(newFont);
-            return newFont;
-        }
-
-        public FontEntry getOrCreate(string name, int fontSize)
-        {
-            return getOrCreate(new []{name}, fontSize);
-        }
-
-        private void onFontTextureRebuilt(Font font)
-        {
-            var entry = _fonts.Find((f) => f.font == font);
-            if (entry != null)
-            {
-                entry.onFontTextureRebuild();
-            }
-        }
-    }
-}

Assets/UIWidgets/ui/txt/mesh.cs

-using UnityEngine;
-
-namespace UIWidgets.ui
-{
-    public class TextMesh: IMesh
-    {
-        private Mesh _mesh;
-        private FontEntry _fontEntry;
-        private string _text;
-        private StyledRuns.Run _run;
-        private int _textureVersion;
-        
-        public TextMesh(Vector2d pos, string text, Vector2d[] _characterPositions, FontEntry fontEntry, StyledRuns.Run run)
-        {
-            _fontEntry = fontEntry;
-            _text = text;
-            this._run = run;
-            
-            var vertices = new Vector3[_text.Length * 4];
-            var triangles = new int[_text.Length * 6];
-            var font = fontEntry.font;
-            var offset = new Vector3((float)Utils.PixelCorrectRound(pos.x), (float)Utils.PixelCorrectRound(pos.y), 0);
-            font.RequestCharactersInTexture(_text.Substring(_run.start, _run.end - _run.start), 
-                _run.style.UnityFontSize, _run.style.UnityFontStyle);
-            for (int charIndex = _run.start; charIndex < _run.end; ++charIndex)
-            {
-                CharacterInfo charInfo = new CharacterInfo();
-                if (_text[charIndex] != '\n' && _text[charIndex] != '\t')
-                {
-                    Debug.Assert(font.GetCharacterInfo(_text[charIndex], out charInfo, _run.style.UnityFontSize, _run.style.UnityFontStyle));
-                    var position = _characterPositions[charIndex];
-                    vertices[4 * charIndex + 0] = offset + new Vector3((float)(position.x + charInfo.minX), 
-                                                      (float)(position.y - charInfo.maxY), 0);
-                    vertices[4 * charIndex + 1] = offset + new Vector3((float)(position.x + charInfo.maxX), 
-                                                      (float)(position.y - charInfo.maxY), 0);
-                    vertices[4 * charIndex + 2] = offset + new Vector3(
-                                                      (float)(position.x + charInfo.maxX), (float)(position.y - charInfo.minY), 0);
-                    vertices[4 * charIndex + 3] = offset + new Vector3(
-                                                      (float)(position.x + charInfo.minX), (float)(position.y - charInfo.minY), 0);
-                }
-                else
-                {
-                    vertices[4 * charIndex + 0] = vertices[4 * charIndex + 1] =
-                        vertices[4 * charIndex + 2] = vertices[4 * charIndex + 3] = offset;
-                } 
-               
-                triangles[6 * charIndex + 0] = 4 * charIndex + 0;
-                triangles[6 * charIndex + 1] = 4 * charIndex + 1;
-                triangles[6 * charIndex + 2] = 4 * charIndex + 2;
-
-                triangles[6 * charIndex + 3] = 4 * charIndex + 0;
-                triangles[6 * charIndex + 4] = 4 * charIndex + 2;
-                triangles[6 * charIndex + 5] = 4 * charIndex + 3;
-            }
-
-            var uv = getTextureUV();
-            var mesh = new Mesh()
-            {
-                vertices = vertices,
-                triangles = triangles,
-                uv = uv
-            };
-            var colors = new UnityEngine.Color[vertices.Length];
-            for (var i = 0; i < colors.Length; i++)
-            {
-                colors[i] = _run.style.UnityColor;
-            }
-
-            mesh.colors = colors;
-            _textureVersion = _fontEntry.textureBuildVersion;
-            _mesh = mesh;
-        }
-        
-        public void syncTextureUV()
-        {
-            if (_fontEntry.textureBuildVersion != _textureVersion) // texture has been rebuilt, update the texture uv
-            {
-                _mesh.uv = getTextureUV();
-            }
-        }
-
-        public Mesh mesh
-        {
-            get { return _mesh; }
-        }
-
-        private Vector2[] getTextureUV()
-        {
-            var font = _fontEntry.font;
-            var uv = _mesh == null ? new Vector2[_text.Length * 4] : _mesh.uv; 
-           
-            for (int charIndex = _run.start; charIndex < _run.end; ++charIndex)
-            {
-                CharacterInfo charInfo = new CharacterInfo();
-                if (_text[charIndex] != '\n' && _text[charIndex] != '\t')
-                {
-                    font.GetCharacterInfo(_text[charIndex], out charInfo, _run.style.UnityFontSize,
-                        _run.style.UnityFontStyle);
-                }
-
-                if (Paragraph.isWordSpace(_text[charIndex]) || Paragraph.isLineEndSpace(_text[charIndex]) || _text[charIndex] == '\t')
-                {                    
-                    uv[4 * charIndex + 0] = Vector2.zero;
-                    uv[4 * charIndex + 1] = Vector2.zero;
-                    uv[4 * charIndex + 2] = Vector2.zero;
-                    uv[4 * charIndex + 3] = Vector2.zero;
-                } else
-                {
-                    uv[4 * charIndex + 0] = charInfo.uvTopLeft;
-                    uv[4 * charIndex + 1] = charInfo.uvTopRight;
-                    uv[4 * charIndex + 2] = charInfo.uvBottomRight;
-                    uv[4 * charIndex + 3] = charInfo.uvBottomLeft;
-                }
-            }
-
-            return uv;
-        }
-    }
-}

Assets/UIWidgets/ui/txt/mesh.cs.meta

-fileFormatVersion: 2
-guid: 96ec1d4b2b7d4bf59d4b2db221323ae9
-timeCreated: 1536283931