Limit constructors, change test format loading

src/ImageSharp/Image.cs

@@ -15,17 +15,6 @@ namespace ImageSharp
     [DebuggerDisplay("Image: {Width}x{Height}")]
     public class Image : Image<Color>
     {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Image"/> class.
-        /// </summary>
-        /// <param name="bootstrapper">
-        /// The bootstrapper providing initialization code which allows extending the library.
-        /// </param>
-        public Image(Bootstrapper bootstrapper = null)
-            : base(bootstrapper)
-        {
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="Image"/> class
         /// with the height and the width of the image.

src/ImageSharp/Image/ImageFrame{TColor}.cs

@@ -19,11 +19,13 @@ namespace ImageSharp
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageFrame{TColor}"/> class.
         /// </summary>
+        /// <param name="width">The width of the image in pixels.</param>
+        /// <param name="height">The height of the image in pixels.</param>
         /// <param name="bootstrapper">
         /// The bootstrapper providing initialization code which allows extending the library.
         /// </param>
-        public ImageFrame(Bootstrapper bootstrapper = null)
-            : base(bootstrapper)
+        public ImageFrame(int width, int height, Bootstrapper bootstrapper = null)
+            : base(width, height, bootstrapper)
         {
         }
 
@@ -53,14 +55,12 @@ namespace ImageSharp
         {
             scaleFunc = PackedPixelConverterHelper.ComputeScaleFunction<TColor, TColor2>(scaleFunc);
 
-            ImageFrame<TColor2> target = new ImageFrame<TColor2>(this.Bootstrapper)
+            ImageFrame<TColor2> target = new ImageFrame<TColor2>(this.Width, this.Height, this.Bootstrapper)
             {
                 Quality = this.Quality,
                 FrameDelay = this.FrameDelay
             };
 
-            target.InitPixels(this.Width, this.Height);
-
             using (PixelAccessor<TColor> pixels = this.Lock())
             using (PixelAccessor<TColor2> targetPixels = target.Lock())
             {

src/ImageSharp/Image/Image{TColor}.cs

@@ -37,19 +37,6 @@ namespace ImageSharp
         /// </summary>
         public const double DefaultVerticalResolution = 96;
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Image{TColor}"/> class.
-        /// </summary>
-        /// <param name="bootstrapper">
-        /// The bootstrapper providing initialization code which allows extending the library.
-        /// </param>
-        public Image(Bootstrapper bootstrapper = null)
-            : base(bootstrapper)
-        {
-            // We want to throw here.
-            this.CurrentImageFormat = this.Bootstrapper.ImageFormats.First();
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="Image{TColor}"/> class
         /// with the height and the width of the image.
@@ -391,7 +378,7 @@ namespace ImageSharp
         {
             if (!this.Bootstrapper.ImageFormats.Any())
             {
-                return;
+                throw new NotSupportedException("No image formats have been configured.");
             }
 
             if (!stream.CanRead)

src/ImageSharp/ImageFrame.cs

@@ -16,7 +16,13 @@ namespace ImageSharp
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageFrame"/> class.
         /// </summary>
-        public ImageFrame()
+        /// <param name="width">The width of the image in pixels.</param>
+        /// <param name="height">The height of the image in pixels.</param>
+        /// <param name="bootstrapper">
+        /// The bootstrapper providing initialization code which allows extending the library.
+        /// </param>
+        public ImageFrame(int width, int height, Bootstrapper bootstrapper = null)
+            : base(width, height, bootstrapper)
         {
         }
 

src/ImageSharp/Quantizers/QuantizedImage.cs

@@ -68,7 +68,7 @@ namespace ImageSharp.Quantizers
         /// </returns>
         public Image<TColor> ToImage()
         {
-            Image<TColor> image = new Image<TColor>();
+            Image<TColor> image = new Image<TColor>(this.Width, this.Height);
 
             int pixelCount = this.Pixels.Length;
             int palleteCount = this.Palette.Length - 1;

tests/ImageSharp.Tests/TestBase.cs

@@ -15,9 +15,9 @@ namespace ImageSharp.Tests
     public abstract class TestBase
     {
         /// <summary>
-        /// Initializes a new instance of the <see cref="TestBase"/> class.
+        /// Initializes static members of the <see cref="TestBase"/> class.
         /// </summary>
-        protected TestBase()
+        static TestBase()
         {
             // Register the individual image formats.
             Bootstrapper.Default.AddImageFormat(new PngFormat());

tests/ImageSharp.Tests/TestFile.cs

@@ -39,7 +39,7 @@ namespace ImageSharp.Tests
         {
             return Path.Combine(FormatsDirectory, file);
         }
-        
+
         public static TestFile Create(string file)
         {
             return cache.GetOrAdd(file, (string fileName) =>

tests/ImageSharp.Tests/TestUtilities/PixelTypes.cs

@@ -54,10 +54,10 @@ namespace ImageSharp.Tests
         /// Triggers instantiating the <see cref="Image"/> subclass of <see cref="Image{TColor}"/>
         /// </summary>
         StandardImageClass = 1 << 29,
-        
+
         // TODO: Add multi-flag entries by rules defined in PackedPixelConverterHelper
 
         // "All" is handled as a separate, individual case instead of using bitwise OR
-        All = 30 
+        All = 30
     }
 }