增加preview命令

SpineViewerCLI/PreviewCommand.cs

@@ -0,0 +1,133 @@
+using NLog;
+using Spectre.Console;
+using Spine;
+using Spine.Exporters;
+using System;
+using System.Collections.Generic;
+using System.CommandLine;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewerCLI
+{
+    public class PreviewCommand : Command
+    {
+        private static readonly Logger _logger = LogManager.GetCurrentClassLogger();
+        private static readonly string _name = "preview";
+        private static readonly string _desc = "Preview a model";
+        private static readonly int MaxResolution = 1024;
+
+        public Argument<FileInfo> ArgSkel { get; } = new("skel")
+        {
+            Description = "Path of skel file.",
+        };
+
+        public Option<FileInfo> OptAtlas { get; } = new("--atlas")
+        {
+            Description = "Path to the atlas file that matches the skel file.",
+        };
+
+        public Option<bool> OptPma { get; } = new("--pma")
+        {
+            Description = "Specifies whether the texture uses PMA (premultiplied alpha) format.",
+        };
+
+        public Option<string[]> OptSkins { get; } = new("--skins")
+        {
+            Description = "Skins to enable. Multiple skins can be specified.",
+            Arity = ArgumentArity.OneOrMore,
+            AllowMultipleArgumentsPerToken = true,
+        };
+
+        public Option<string[]> OptAnimations { get; } = new("--animations")
+        {
+            Description = "Animations to export. Supports multiple entries, placed in order on tracks starting from 0.",
+            Arity = ArgumentArity.OneOrMore,
+            AllowMultipleArgumentsPerToken = true,
+        };
+
+        public Option<float> OptTime { get; } = new("--time")
+        {
+            Description = "Start time offset of the animation.",
+            DefaultValueFactory = _ => 0f,
+        };
+
+        public PreviewCommand() : base(_name, _desc)
+        {
+            OptTime.Validators.Add(r =>
+            {
+                if (r.Tokens.Count > 0 && float.TryParse(r.Tokens[0].Value, out var v) && v < 0)
+                    r.AddError($"{OptTime.Name} must be non-negative.");
+            });
+
+            this.AddArgsAndOpts();
+            SetAction(PreviewAction);
+        }
+
+        private void PreviewAction(ParseResult result)
+        {
+            // 读取模型
+            using var spine = new SpineObject(result.GetValue(ArgSkel)!.FullName, result.GetValue(OptAtlas)?.FullName);
+
+            spine.UsePma = result.GetValue(OptPma);
+
+            // 设置要导出的动画
+            int trackIdx = 0;
+            foreach (var name in result.GetValue(OptAnimations))
+            {
+                if (!spine.Data.AnimationsByName.ContainsKey(name))
+                {
+                    _logger.Warn("No animation named '{0}', skip it", name);
+                    continue;
+                }
+                spine.AnimationState.SetAnimation(trackIdx, name, true);
+                trackIdx++;
+            }
+
+            // 设置需要启用的皮肤
+            foreach (var name in result.GetValue(OptSkins))
+            {
+                if (!spine.SetSkinStatus(name, true))
+                {
+                    _logger.Warn("Failed to enable skin '{0}'", name);
+                }
+            }
+
+            // 设置时间偏移量
+            spine.Update(result.GetValue(OptTime));
+
+            using var exporter = GetExporterFilledWithArgs(result, spine);
+            using var skImage = exporter.ExportMemoryImage(spine);
+            using var skData = skImage.Encode();
+            var img = new CanvasImage(skData.AsSpan());
+            AnsiConsole.Write(img);
+        }
+
+        private FrameExporter GetExporterFilledWithArgs(ParseResult result, SpineObject spine)
+        {
+            // 根据模型获取自动分辨率和视区参数
+            var bounds = spine.GetCurrentBounds();
+            var resolution = new SFML.System.Vector2u((uint)bounds.Size.X, (uint)bounds.Size.Y);
+            if (resolution.X >= MaxResolution || resolution.Y >= MaxResolution)
+            {
+                // 缩小到最大像素限制
+                var scale = Math.Min(MaxResolution / bounds.Width, MaxResolution / bounds.Height);
+                resolution.X = (uint)(bounds.Width * scale);
+                resolution.Y = (uint)(bounds.Height * scale);
+            }
+            var viewBounds = bounds.GetCanvasBounds(resolution);
+
+            return new FrameExporter(resolution)
+            {
+                Size = new(viewBounds.Width, -viewBounds.Height),
+                Center = viewBounds.Position + viewBounds.Size / 2,
+                Rotation = 0,
+                BackgroundColor = SFML.Graphics.Color.Transparent,
+
+                Format = SkiaSharp.SKEncodedImageFormat.Png,
+                Quality = 100,
+            };
+        }
+    }
+}