From d90351341fb5d00b29450e6ff2c3f2fa768fc225 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Tue, 29 Nov 2016 01:12:19 +1100
Subject: [PATCH] Add new To<TColor,TPacked> method

---
 src/ImageSharp/Image/Image.cs                 | 58 ++++++++++++++++++-
 src/ImageSharp/Image/ImageFrame.cs            | 51 ++++++++++++++--
 .../Formats/GeneralFormatTests.cs             |  1 +
 3 files changed, 105 insertions(+), 5 deletions(-)

diff --git a/src/ImageSharp/Image/Image.cs b/src/ImageSharp/Image/Image.cs
index 0bcf7c6eb..cfac0c7a0 100644
--- a/src/ImageSharp/Image/Image.cs
+++ b/src/ImageSharp/Image/Image.cs
@@ -11,6 +11,7 @@ namespace ImageSharp
     using System.IO;
     using System.Linq;
     using System.Text;
+    using System.Threading.Tasks;
 
     using Formats;
 
@@ -245,7 +246,7 @@ namespace ImageSharp
         /// <summary>
         /// Returns a Base64 encoded string from the given image.
         /// </summary>
-        /// <example>data:image/gif;base64,R0lGODlhAQABAIABAEdJRgAAACwAAAAAAQABAAACAkQBAA==</example>
+        /// <example><see href="data:image/gif;base64,R0lGODlhAQABAIABAEdJRgAAACwAAAAAAQABAAACAkQBAA=="/></example>
         /// <returns>The <see cref="string"/></returns>
         public string ToBase64String()
         {
@@ -257,6 +258,57 @@ namespace ImageSharp
             }
         }
 
+        /// <summary>
+        /// Returns a copy of the image in the given pixel format.
+        /// </summary>
+        /// <typeparam name="TColor2">The pixel format.</typeparam>
+        /// <typeparam name="TPacked2">The packed format. <example>uint, long, float.</example></typeparam>
+        /// <returns>The <see cref="Image{TColor2, TPacked2}"/></returns>
+        public Image<TColor2, TPacked2> To<TColor2, TPacked2>()
+            where TColor2 : struct, IPackedPixel<TPacked2>
+            where TPacked2 : struct
+        {
+            Image<TColor2, TPacked2> target = new Image<TColor2, TPacked2>(this.Width, this.Height)
+            {
+                Quality = this.Quality,
+                FrameDelay = this.FrameDelay,
+                HorizontalResolution = this.HorizontalResolution,
+                VerticalResolution = this.VerticalResolution,
+                CurrentImageFormat = this.CurrentImageFormat,
+                RepeatCount = this.RepeatCount
+            };
+
+            using (PixelAccessor<TColor, TPacked> pixels = this.Lock())
+            using (PixelAccessor<TColor2, TPacked2> targetPixels = target.Lock())
+            {
+                Parallel.For(
+                    0,
+                    target.Height,
+                    Bootstrapper.Instance.ParallelOptions,
+                    y =>
+                        {
+                            for (int x = 0; x < target.Width; x++)
+                            {
+                                TColor2 color = default(TColor2);
+                                color.PackFromVector4(pixels[x, y].ToVector4());
+                                targetPixels[x, y] = color;
+                            }
+                        });
+            }
+
+            if (this.ExifProfile != null)
+            {
+                target.ExifProfile = new ExifProfile(this.ExifProfile);
+            }
+
+            foreach (ImageFrame<TColor, TPacked> frame in this.Frames)
+            {
+                target.Frames.Add(frame.To<TColor2, TPacked2>());
+            }
+
+            return target;
+        }
+
         /// <summary>
         /// Copies the properties from the other <see cref="Image{TColor, TPacked}"/>.
         /// </summary>
@@ -278,6 +330,10 @@ namespace ImageSharp
             }
         }
 
+        /// <summary>
+        /// Creates a new <see cref="ImageFrame{TColor,TPacked}"/> from this instance
+        /// </summary>
+        /// <returns>The <see cref="ImageFrame{TColor,TPacked}"/></returns>
         internal virtual ImageFrame<TColor, TPacked> ToFrame()
         {
             return new ImageFrame<TColor, TPacked>(this);
diff --git a/src/ImageSharp/Image/ImageFrame.cs b/src/ImageSharp/Image/ImageFrame.cs
index d63618766..2a49a3980 100644
--- a/src/ImageSharp/Image/ImageFrame.cs
+++ b/src/ImageSharp/Image/ImageFrame.cs
@@ -5,6 +5,8 @@
 
 namespace ImageSharp
 {
+    using System.Threading.Tasks;
+
     /// <summary>
     /// Represents a single frame in a animation.
     /// </summary>
@@ -24,9 +26,7 @@ namespace ImageSharp
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageFrame{TColor, TPacked}"/> class.
         /// </summary>
-        /// <param name="image">
-        /// The image to create the frame from.
-        /// </param>
+        /// <param name="image">The image to create the frame from.</param>
         public ImageFrame(ImageBase<TColor, TPacked> image)
             : base(image)
         {
@@ -38,9 +38,52 @@ namespace ImageSharp
             return $"ImageFrame: {this.Width}x{this.Height}";
         }
 
+        /// <summary>
+        /// Returns a copy of the image frame in the given pixel format.
+        /// </summary>
+        /// <typeparam name="TColor2">The pixel format.</typeparam>
+        /// <typeparam name="TPacked2">The packed format. <example>uint, long, float.</example></typeparam>
+        /// <returns>The <see cref="ImageFrame{TColor2, TPacked2}"/></returns>
+        public ImageFrame<TColor2, TPacked2> To<TColor2, TPacked2>()
+            where TColor2 : struct, IPackedPixel<TPacked2>
+            where TPacked2 : struct
+        {
+            ImageFrame<TColor2, TPacked2> target = new ImageFrame<TColor2, TPacked2>
+            {
+                Quality = this.Quality,
+                FrameDelay = this.FrameDelay
+            };
+
+            target.InitPixels(this.Width, this.Height);
+
+            using (PixelAccessor<TColor, TPacked> pixels = this.Lock())
+            using (PixelAccessor<TColor2, TPacked2> targetPixels = target.Lock())
+            {
+                Parallel.For(
+                    0,
+                    target.Height,
+                    Bootstrapper.Instance.ParallelOptions,
+                    y =>
+                    {
+                        for (int x = 0; x < target.Width; x++)
+                        {
+                            TColor2 color = default(TColor2);
+                            color.PackFromVector4(pixels[x, y].ToVector4());
+                            targetPixels[x, y] = color;
+                        }
+                    });
+            }
+
+            return target;
+        }
+
+        /// <summary>
+        /// Clones the current instance.
+        /// </summary>
+        /// <returns>The <see cref="ImageFrame{TColor, TPacked}"/></returns>
         internal virtual ImageFrame<TColor, TPacked> Clone()
         {
             return new ImageFrame<TColor, TPacked>(this);
         }
     }
-}
+}
\ No newline at end of file
diff --git a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
index 7d88ca6e1..542a131d8 100644
--- a/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
+++ b/tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs
@@ -52,6 +52,7 @@ namespace ImageSharp.Tests
             foreach (TestFile file in Files)
             {
                 Image image = file.CreateImage();
+                // Image<Bgr565, ushort> image = file.CreateImage().To<Bgr565, ushort>();
 
                 using (FileStream output = File.OpenWrite($"{path}/{file.FileName}"))
                 {