using System; using System.Collections.Generic; using System.Linq; using UnityEngine; namespace Unity.UIWidgets.ui { class MeshKey : IEquatable { public readonly long textBlobId; public readonly float scale; public MeshKey(long textBlobId, float scale) { this.textBlobId = textBlobId; this.scale = scale; } public bool Equals(MeshKey other) { if (ReferenceEquals(null, other)) return false; if (ReferenceEquals(this, other)) return true; return this.textBlobId == other.textBlobId && this.scale.Equals(other.scale); } public override bool Equals(object obj) { if (ReferenceEquals(null, obj)) return false; if (ReferenceEquals(this, obj)) return true; if (obj.GetType() != this.GetType()) return false; return this.Equals((MeshKey) obj); } public override int GetHashCode() { unchecked { return (this.textBlobId.GetHashCode() * 397) ^ this.scale.GetHashCode(); } } public static bool operator ==(MeshKey left, MeshKey right) { return Equals(left, right); } public static bool operator !=(MeshKey left, MeshKey right) { return !Equals(left, right); } public override string ToString() { return $"{nameof(this.textBlobId)}: {this.textBlobId}, {nameof(this.scale)}: {this.scale}"; } } class MeshInfo { public readonly MeshKey key; public readonly long textureVersion; public readonly MeshMesh mesh; long _timeToLive; public MeshInfo(MeshKey key, MeshMesh mesh, long textureVersion, int timeToLive = 5) { this.mesh = mesh; this.key = key; this.textureVersion = textureVersion; this.touch(timeToLive); } public long timeToLive { get { return this._timeToLive; } } public void touch(long timeTolive = 5) { this._timeToLive = timeTolive + MeshGenerator.frameCount; } } static class MeshGenerator { static readonly Dictionary _meshes = new Dictionary(); static long _frameCount = 0; public static long frameCount { get { return _frameCount; } } public static int meshCount { get { return _meshes.Count; } } public static void tickNextFrame() { _frameCount++; var keysToRemove = _meshes.Values.Where(info => info.timeToLive < _frameCount) .Select(info => info.key).ToList(); foreach (var key in keysToRemove) { _meshes.Remove(key); } } public static MeshMesh generateMesh(TextBlob textBlob, float scale) { var style = textBlob.style; var fontInfo = FontManager.instance.getOrCreate(style.fontFamily); var key = new MeshKey(textBlob.instanceId, scale); _meshes.TryGetValue(key, out var meshInfo); if (meshInfo != null && meshInfo.textureVersion == fontInfo.textureVersion) { meshInfo.touch(); return meshInfo.mesh; } var font = fontInfo.font; var length = textBlob.textSize; var text = textBlob.text; var fontSizeToLoad = Mathf.CeilToInt(style.UnityFontSize * scale); var subText = textBlob.text.Substring(textBlob.textOffset, textBlob.textSize); font.RequestCharactersInTexture(subText, fontSizeToLoad, style.UnityFontStyle); var vertices = new List(length * 4); var triangles = new List(length * 6); var uv = new List(length * 4); for (int charIndex = 0; charIndex < length; ++charIndex) { var ch = text[charIndex + textBlob.textOffset]; // first char as origin for mesh position var position = textBlob.positions[charIndex]; if (LayoutUtils.isWordSpace(ch) || LayoutUtils.isLineEndSpace(ch) || ch == '\t') { continue; } CharacterInfo charInfo; font.GetCharacterInfo(ch, out charInfo, fontSizeToLoad, style.UnityFontStyle); var minX = charInfo.minX / scale; var maxX = charInfo.maxX / scale; var minY = charInfo.minY / scale; var maxY = charInfo.maxY / scale; var baseIndex = vertices.Count; vertices.Add(new Vector3((float) (position.x + minX), (float) (position.y - maxY), 0)); vertices.Add(new Vector3((float) (position.x + maxX), (float) (position.y - maxY), 0)); vertices.Add(new Vector3((float) (position.x + maxX), (float) (position.y - minY), 0)); vertices.Add(new Vector3((float) (position.x + minX), (float) (position.y - minY), 0)); triangles.Add(baseIndex); triangles.Add(baseIndex + 1); triangles.Add(baseIndex + 2); triangles.Add(baseIndex); triangles.Add(baseIndex + 2); triangles.Add(baseIndex + 3); uv.Add(charInfo.uvTopLeft); uv.Add(charInfo.uvTopRight); uv.Add(charInfo.uvBottomRight); uv.Add(charInfo.uvBottomLeft); } if (vertices.Count == 0) { return null; } MeshMesh mesh = vertices.Count > 0 ? new MeshMesh(null, vertices, triangles, uv) : null; _meshes[key] = new MeshInfo(key, mesh, fontInfo.textureVersion); return mesh; } } }