Add support for multi page Tiff and Gif

Author: mee-ironsoftware

IronSoftware.Drawing/IronSoftware.Drawing.Common.Tests/Data/multiframe.tiff

@@ -1,7 +1,9 @@
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.Processing;
 using System;
+using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -376,30 +378,88 @@ public void CastSixLabors_from_AnyBitmap()
         public void Load_Tiff_Image()
         {
             AnyBitmap anyBitmap = AnyBitmap.FromFile(GetRelativeFilePath("IRON-274-39065.tif"));
-            Assert.Equal(1, anyBitmap.FrameCount);
+            Assert.Equal(2, anyBitmap.FrameCount);
 
             AnyBitmap multiPage = AnyBitmap.FromFile(GetRelativeFilePath("animated_qr.gif"));
             Assert.Equal(4, multiPage.FrameCount);
-            Assert.Equal(4, multiPage.Frames.Count);
-            multiPage.Frames[0].SaveAs("first.png");
-            multiPage.Frames[3].SaveAs("last.png");
+            Assert.Equal(4, multiPage.GetAllFrames.Count());
+            multiPage.GetAllFrames.First().SaveAs("first.png");
+            multiPage.GetAllFrames.Last().SaveAs("last.png");
             AssertImageAreEqual(GetRelativeFilePath("first-animated-qr.png"), "first.png");
             AssertImageAreEqual(GetRelativeFilePath("last-animated-qr.png"), "last.png");
 
             byte[] bytes = File.ReadAllBytes(GetRelativeFilePath("IRON-274-39065.tif"));
             anyBitmap = AnyBitmap.FromBytes(bytes);
-            Assert.Equal(1, anyBitmap.FrameCount);
+            Assert.Equal(2, anyBitmap.FrameCount);
 
             byte[] multiPageBytes = File.ReadAllBytes(GetRelativeFilePath("animated_qr.gif"));
             multiPage = AnyBitmap.FromBytes(multiPageBytes);
             Assert.Equal(4, multiPage.FrameCount);
-            Assert.Equal(4, multiPage.Frames.Count);
-            multiPage.Frames[0].SaveAs("first.png");
-            multiPage.Frames[3].SaveAs("last.png");
+            Assert.Equal(4, multiPage.GetAllFrames.Count());
+            multiPage.GetAllFrames.First().SaveAs("first.png");
+            multiPage.GetAllFrames.Last().SaveAs("last.png");
             AssertImageAreEqual(GetRelativeFilePath("first-animated-qr.png"), "first.png");
             AssertImageAreEqual(GetRelativeFilePath("last-animated-qr.png"), "last.png");
         }
 
+        [FactWithAutomaticDisplayName]
+        public void Try_UnLoad_Tiff_Image()
+        {
+            AnyBitmap anyBitmap = AnyBitmap.FromFile(GetRelativeFilePath("multiframe.tiff"));
+            Assert.Equal(2, anyBitmap.FrameCount);
+        }
+
+        [FactWithAutomaticDisplayName]
+        public void Create_Multi_page_Tiff()
+        {
+            List<AnyBitmap> bitmaps = new List<AnyBitmap>()
+            {
+                AnyBitmap.FromFile(GetRelativeFilePath("first-animated-qr.png")),
+                AnyBitmap.FromFile(GetRelativeFilePath("last-animated-qr.png"))
+            };
+
+            AnyBitmap anyBitmap = AnyBitmap.CreateMultiFrameTiff(bitmaps);
+            Assert.Equal(2, anyBitmap.FrameCount);
+            Assert.Equal(2, anyBitmap.GetAllFrames.Count());
+            anyBitmap.GetAllFrames.ElementAt(0).SaveAs("first.png");
+            anyBitmap.GetAllFrames.ElementAt(1).SaveAs("last.png");
+            AssertImageAreEqual(GetRelativeFilePath("first-animated-qr.png"), "first.png");
+            AssertImageAreEqual(GetRelativeFilePath("last-animated-qr.png"), "last.png");
+        }
+
+        [FactWithAutomaticDisplayName]
+        public void Create_Multi_page_Gif()
+        {
+            List<AnyBitmap> bitmaps = new List<AnyBitmap>()
+            {
+                AnyBitmap.FromFile(GetRelativeFilePath("first-animated-qr.png")),
+                AnyBitmap.FromFile(GetRelativeFilePath("mountainclimbers.jpg"))
+            };
+
+            AnyBitmap anyBitmap = AnyBitmap.CreateMultiFrameGif(bitmaps);
+            Assert.Equal(2, anyBitmap.FrameCount);
+            Assert.Equal(2, anyBitmap.GetAllFrames.Count());
+            anyBitmap.GetAllFrames.ElementAt(0).SaveAs("first.png");
+            Image first = Image.Load(GetRelativeFilePath("first-animated-qr.png"));
+            first.Mutate(img => img.Resize(new ResizeOptions
+            {
+                Size = new SixLabors.ImageSharp.Size(anyBitmap.GetAllFrames.ElementAt(0).Width, anyBitmap.GetAllFrames.ElementAt(0).Height),
+                Mode = SixLabors.ImageSharp.Processing.ResizeMode.BoxPad
+            }));
+            first.Save("first-expected.jpg");
+            AssertImageAreEqual("first-expected.jpg", "first.png", true);
+
+            anyBitmap.GetAllFrames.ElementAt(1).SaveAs("last.png");
+            Image last = Image.Load(GetRelativeFilePath("mountainclimbers.jpg"));
+            last.Mutate(img => img.Resize(new ResizeOptions
+            {
+                Size = new SixLabors.ImageSharp.Size(anyBitmap.GetAllFrames.ElementAt(1).Width, anyBitmap.GetAllFrames.ElementAt(1).Height),
+                Mode = SixLabors.ImageSharp.Processing.ResizeMode.BoxPad
+            }));
+            last.Save("last-expected.jpg");
+            AssertImageAreEqual("last-expected.jpg", "last.png", true);
+        }
+
 #if !NET472
         [FactWithAutomaticDisplayName]
         public void CastMaui_to_AnyBitmap()