更换为wpf

Spine/Exporters/VideoExporter.cs

@@ -0,0 +1,142 @@
+using NLog;
+using SFML.System;
+using SkiaSharp;
+using System;
+using System.Collections.Frozen;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Spine.Exporters
+{
+    /// <summary>
+    /// 多帧画面导出基类, 可以获取连续的帧序列
+    /// </summary>
+    public abstract class VideoExporter : BaseExporter
+    {
+        public VideoExporter(uint width, uint height) : base(width, height) { }
+        public VideoExporter(Vector2u resolution) : base(resolution) { }
+
+        /// <summary>
+        /// 导出时长
+        /// </summary>
+        public float Duration 
+        { 
+            get => _duration; 
+            set
+            {
+                if (value < 0)
+                {
+                    _logger.Warn("Omit invalid duration: {0}", value);
+                    return;
+                }
+                _duration = value;
+            }
+        }
+        protected float _duration = 0;
+
+        /// <summary>
+        /// 帧率
+        /// </summary>
+        public float Fps
+        {
+            get => _fps;
+            set
+            {
+                if (value <= 0)
+                {
+                    _logger.Warn("Omit invalid fps: {0}", value);
+                    return;
+                }
+                _fps = value;
+            }
+        }
+        protected float _fps = 24;
+
+        /// <summary>
+        /// 是否保留最后一帧
+        /// </summary>
+        public bool KeepLast { get => _keepLast; set => _keepLast = value; }
+        protected bool _keepLast = true;
+
+        /// <summary>
+        /// 获取总帧数
+        /// </summary>
+        public int GetFrameCount()
+        {
+            var delta = 1f / _fps;
+            var total = (int)(_duration * _fps); // 完整帧的数量
+
+            var deltaFinal = _duration - delta * total; // 最后一帧时长
+            var final = _keepLast && deltaFinal > 1e-3 ? 1 : 0;
+
+            var frameCount = 1 + total + final; // 所有帧的数量 = 起始帧 + 完整帧 + 最后一帧
+            return frameCount;
+        }
+
+        /// <summary>
+        /// 生成帧序列
+        /// </summary>
+        protected IEnumerable<SFMLImageVideoFrame> GetFrames(SpineObject[] spines)
+        {
+            float delta = 1f / _fps;
+            int total = (int)(_duration * _fps); // 完整帧的数量
+            bool hasFinal = _keepLast && (_duration - delta * total) > 1e-3;
+
+            // 导出首帧
+            var firstFrame = GetFrame(spines);
+            yield return firstFrame;
+
+            // 导出完整帧
+            for (int i = 0; i < total; i++)
+            {
+                foreach (var spine in spines) spine.Update(delta);
+                yield return GetFrame(spines);
+            }
+
+            // 导出最后一帧
+            if (hasFinal)
+            {
+                // XXX: 此处还是按照完整的一帧时长进行更新, 也许可以只更新准确的最后一帧时长
+                foreach (var spine in spines) spine.Update(delta); 
+                yield return GetFrame(spines);
+            }
+        }
+
+        /// <summary>
+        /// 生成帧序列, 支持中途取消和进度输出
+        /// </summary>
+        protected IEnumerable<SFMLImageVideoFrame> GetFrames(SpineObject[] spines, string output, CancellationToken ct)
+        {
+            int frameCount = GetFrameCount();
+            int frameIdx = 0;
+
+            _progressReporter?.Invoke(frameCount, 0, $"[{frameIdx}/{frameCount}] {output}");
+            foreach (var frame in GetFrames(spines))
+            {
+                if (ct.IsCancellationRequested)
+                {
+                    _logger.Info("Export cancelled");
+                    frame.Dispose();
+                    break;
+                }
+
+                _progressReporter?.Invoke(frameCount, frameIdx, $"[{frameIdx + 1}/{frameCount}] {output}");
+                yield return frame;
+                frameIdx++;
+            }
+        }
+
+        public sealed override void Export(string output, params SpineObject[] spines) => Export(output, default, spines);
+
+        /// <summary>
+        /// 导出给定的模型, 从前往后对应从上往下的渲染顺序
+        /// </summary>
+        /// <param name="output">输出路径, 一般而言都是文件路径, 少数情况指定的是文件夹</param>
+        /// <param name="ct">取消令牌</param>
+        /// <param name="spines">要导出的模型, 从前往后对应从上往下的渲染顺序</param>
+        public abstract void Export(string output, CancellationToken ct, params SpineObject[] spines);
+    }
+}