small change

SpineViewer/Spine/SpineExporter/GifExporter.cs

@@ -0,0 +1,79 @@
+using FFMpegCore;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewer.Spine.SpineExporter
+{
+    /// <summary>
+    /// GIF 导出参数
+    /// </summary>
+    public class GifExporter : FFmpegVideoExporter
+    {
+        public GifExporter()
+        {
+            FPS = 24;
+        }
+
+        public override string Format => "gif";
+
+        public override string Suffix => ".gif";
+
+        /// <summary>
+        /// 调色板最大颜色数量
+        /// </summary>
+        public uint MaxColors { get => maxColors; set => maxColors = Math.Clamp(value, 2, 256); }
+        private uint maxColors = 256;
+
+        /// <summary>
+        /// 透明度阈值
+        /// </summary>
+        public byte AlphaThreshold { get => alphaThreshold; set => alphaThreshold = value; }
+        private byte alphaThreshold = 128;
+
+        /// <summary>
+        /// 循环次数, -1 不循环, 0 无限循环, 取值范围 [-1, 65535]
+        /// </summary>
+        public int Loop { get => loop; set => loop = Math.Clamp(value, -1, 65535); }
+        private int loop = 0;
+
+        public override string FileNameNoteSuffix => $"{MaxColors}_{AlphaThreshold}";
+
+        public override void SetOutputOptions(FFMpegArgumentOptions options)
+        {
+            base.SetOutputOptions(options);
+            var v = $"[0:v] split [s0][s1]";
+            var s0 = $"[s0] palettegen=reserve_transparent=1:max_colors={MaxColors} [p]";
+            var s1 = $"[s1][p] paletteuse=dither=bayer:alpha_threshold={AlphaThreshold}";
+            var customArgs = $"-filter_complex \"{v};{s0};{s1}\" -loop {Loop}";
+            options.WithCustomArgument(customArgs);
+        }
+    }
+
+    class GifExporterProperty(FFmpegVideoExporter exporter) : FFmpegVideoExporterProperty(exporter)
+    {
+        [Browsable(false)]
+        public override GifExporter Exporter => (GifExporter)base.Exporter;
+
+        /// <summary>
+        /// 调色板最大颜色数量
+        /// </summary>
+        [Category("[3] 格式参数"), DisplayName("调色板最大颜色数量"), Description("设置调色板使用的最大颜色数量, 越多则色彩保留程度越高")]
+        public uint MaxColors { get => Exporter.MaxColors; set => Exporter.MaxColors = value; }
+
+        /// <summary>
+        /// 透明度阈值
+        /// </summary>
+        [Category("[3] 格式参数"), DisplayName("透明度阈值"), Description("小于该值的像素点会被认为是透明像素")]
+        public byte AlphaThreshold { get => Exporter.AlphaThreshold; set => Exporter.AlphaThreshold = value; }
+
+        /// <summary>
+        /// 透明度阈值
+        /// </summary>
+        [Category("[3] 格式参数"), DisplayName("循环次数"), Description("-loop, 循环次数, -1 不循环, 0 无限循环, 取值范围 [-1, 65535]")]
+        public int Loop { get => Exporter.Loop; set => Exporter.Loop = value; }
+    }
+}