From 4ca35a5e92a02234de2d2dea3cc5a775c66a7ad3 Mon Sep 17 00:00:00 2001
From: miku-666 <74728189+NessieHax@users.noreply.github.com>
Date: Wed, 30 Aug 2023 18:42:30 +0200
Subject: [PATCH] AnimationEditor - Added ability to export animation as gif

---
 PCK-Studio/Forms/Editor/AnimationEditor.cs | 49 +++++++---------------
 PCK-Studio/Internal/Animation.cs           | 32 +++++++++++++-
 PCK-Studio/PckStudio.csproj                |  3 ++
 3 files changed, 50 insertions(+), 34 deletions(-)

diff --git a/PCK-Studio/Forms/Editor/AnimationEditor.cs b/PCK-Studio/Forms/Editor/AnimationEditor.cs
index 4638c6a3..aae1adf3 100644
--- a/PCK-Studio/Forms/Editor/AnimationEditor.cs
+++ b/PCK-Studio/Forms/Editor/AnimationEditor.cs
@@ -34,6 +34,7 @@ using PckStudio.Properties;
 using PckStudio.Internal;
 using PckStudio.Internal.Json;
 using PckStudio.Helper;
+using AnimatedGif;
 
 namespace PckStudio.Forms.Editor
 {
@@ -291,7 +292,6 @@ namespace PckStudio.Forms.Editor
 			diag.Dispose();
 		}
 
-		// Reworked import tool with new Animation classes by Miku
 		private void importJavaAnimationToolStripMenuItem_Click(object sender, EventArgs e)
 		{
 			if (MessageBox.Show(
@@ -483,40 +483,23 @@ namespace PckStudio.Forms.Editor
 			LoadAnimationTreeView();
         }
 
-        //[System.Runtime.InteropServices.DllImport("gdi32.dll")]
-        //public static extern bool DeleteObject(IntPtr hObject);
-
-        private void gifToolStripMenuItem_Click(object sender, EventArgs e)
+		private void gifToolStripMenuItem_Click(object sender, EventArgs e)
         {
-			MessageBox.Show(this, "This feature is still under development", "Coming soon");
-			return;
+			var fileDialog = new SaveFileDialog()
+			{
+				FileName = _tileName,
+				Filter = "GIF file|*.gif"
+			};
+			if (fileDialog.ShowDialog(this) != DialogResult.OK)
+				return;
 
-			// TODO
-			//var fileDialog = new SaveFileDialog()
-            //{
-            //    Filter = "GIF file|*.gif"
-            //};
-            //if (fileDialog.ShowDialog(this) != DialogResult.OK)
-            //    return;
-
-			//GifBitmapEncoder gifBitmapEncoder = new GifBitmapEncoder();
-
-			//foreach (Bitmap texture in currentAnimation.GetTextures())
-			//{
-			//	var bmp = texture.GetHbitmap();
-			//	var src = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
-			//		bmp,
-			//		IntPtr.Zero,
-			//		System.Windows.Int32Rect.Empty,
-			//		BitmapSizeOptions.FromWidthAndHeight(texture.Width, texture.Height));
-			//	gifBitmapEncoder.Frames.Add(BitmapFrame.Create(src));
-			//	DeleteObject(bmp); // recommended, handle memory leak
-			//}
-
-			//using (var fs = fileDialog.OpenFile())
-			//{
-			//	gifBitmapEncoder.Save(fs);
-			//}
+            using (var gifWriter = AnimatedGif.AnimatedGif.Create(fileDialog.FileName, Animation.GameTickInMilliseconds, repeat: 0))
+			{
+				foreach (var frame in _animation.GetInterpolatedFrames())
+				{
+					gifWriter.AddFrame(frame.Texture, frame.Ticks * Animation.GameTickInMilliseconds, GifQuality.Bit8);
+				}
+			}
 		}
 
 		private void frameTimeandTicksToolStripMenuItem_Click(object sender, EventArgs e)
diff --git a/PCK-Studio/Internal/Animation.cs b/PCK-Studio/Internal/Animation.cs
index 21f6793e..2b877380 100644
--- a/PCK-Studio/Internal/Animation.cs
+++ b/PCK-Studio/Internal/Animation.cs
@@ -21,6 +21,7 @@ using System.Drawing;
 using PckStudio.Extensions;
 using System.Text;
 using System.Collections.ObjectModel;
+using System.Linq;
 
 namespace PckStudio.Internal
 {
@@ -28,6 +29,8 @@ namespace PckStudio.Internal
 	{
 		public const int MinimumFrameTime = 1;
 
+		public const int GameTickInMilliseconds = 50;
+
 		public static Animation Empty(AnimationCategory category)
 		{
             var animation = new Animation(Array.Empty<Image>(), string.Empty);
@@ -172,7 +175,34 @@ namespace PckStudio.Internal
 			return new ReadOnlyCollection<Frame>(frames);
 		}
 
-		public IReadOnlyCollection<Image> GetTextures()
+		public IReadOnlyCollection<Frame> GetInterpolatedFrames()
+		{
+            if (Interpolate)
+            {
+                return new ReadOnlyCollection<Frame>(InternalGetInterpolatedFrames().ToList());
+            }
+			return GetFrames();
+        }
+
+		private IEnumerable<Frame> InternalGetInterpolatedFrames()
+		{
+			for (int i = 0; i < FrameCount; i++)
+			{
+				Frame currentFrame = frames[i];
+				Frame nextFrame = frames[0];
+				if (i + 1 < FrameCount)
+					nextFrame = frames[i + 1];
+				for (int tick = 0; tick < currentFrame.Ticks; tick++)
+				{
+					double delta = 1.0f - tick / (double)currentFrame.Ticks;
+					yield return new Frame(currentFrame.Texture.Interpolate(nextFrame.Texture, delta));
+				}
+			}
+			yield break;
+		}
+
+
+        public IReadOnlyCollection<Image> GetTextures()
 		{
 			return textures;
 		}
diff --git a/PCK-Studio/PckStudio.csproj b/PCK-Studio/PckStudio.csproj
index 73092839..3e040c1d 100644
--- a/PCK-Studio/PckStudio.csproj
+++ b/PCK-Studio/PckStudio.csproj
@@ -691,6 +691,9 @@
     <Content Include="Resources\NoImageFound.png" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="AnimatedGif">
+      <Version>1.0.5</Version>
+    </PackageReference>
     <PackageReference Include="Costura.Fody">
       <Version>5.8.0-alpha0098</Version>
       <IncludeAssets>compile; runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>