项目结构调整

Others/WpfAnimatedGif/Decoding/GifFrame.cs

@@ -0,0 +1,47 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace WpfAnimatedGif.Decoding
+{
+    internal class GifFrame : GifBlock
+    {
+        internal const int ImageSeparator = 0x2C;
+
+        public GifImageDescriptor Descriptor { get; private set; }
+        public GifColor[] LocalColorTable { get; private set; }
+        public IList<GifExtension> Extensions { get; private set; }
+        public GifImageData ImageData { get; private set; }
+
+        private GifFrame()
+        {
+        }
+
+        internal override GifBlockKind Kind
+        {
+            get { return GifBlockKind.GraphicRendering; }
+        }
+
+        internal static GifFrame ReadFrame(Stream stream, IEnumerable<GifExtension> controlExtensions, bool metadataOnly)
+        {
+            var frame = new GifFrame();
+
+            frame.Read(stream, controlExtensions, metadataOnly);
+
+            return frame;
+        }
+
+        private void Read(Stream stream, IEnumerable<GifExtension> controlExtensions, bool metadataOnly)
+        {
+            // Note: at this point, the Image Separator (0x2C) has already been read
+
+            Descriptor = GifImageDescriptor.ReadImageDescriptor(stream);
+            if (Descriptor.HasLocalColorTable)
+            {
+                LocalColorTable = GifHelpers.ReadColorTable(stream, Descriptor.LocalColorTableSize);
+            }
+            ImageData = GifImageData.ReadImageData(stream, metadataOnly);
+            Extensions = controlExtensions.ToList().AsReadOnly();
+        }
+    }
+}