/// <summary>
/// Initializes a new instance of the <see cref="Importer"/> class,
/// featuring support for the default image formats JPG/JPEG, PNG,
/// (animated) GIF, BMP and TIF/TIFF.
/// </summary>
public Importer()
{
ImportImage defaultImporter = delegate(string path)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
Image source = Image.FromFile(path);
//Downscale big images right in the importer to improve
//performance (only if image is not animated).
double scaleFactor = Math.Min(1,
(double)MaxPixels / (source.Width * source.Height));
if (AnimatedImage.GetFrameCount(source) > 1 ||
scaleFactor == 1.0 ||
!DownscaleOversizedImages)
{
return(source);
}
try
{
Image image = new Bitmap((int)(source.Width * scaleFactor),
(int)(source.Height * scaleFactor));
using (Graphics graphics = Graphics.FromImage(image))
{
graphics.InterpolationMode =
InterpolationMode.HighQualityBicubic;
graphics.DrawImage(source, 0, 0, image.Width,
image.Height);
}
return(image);
}
finally
{
if (source != null)
{
source.Dispose();
}
}
};
importers.Add("jpg", defaultImporter);
importers.Add("jpeg", defaultImporter);
importers.Add("png", defaultImporter);
importers.Add("gif", defaultImporter);
importers.Add("bmp", defaultImporter);
importers.Add("tif", defaultImporter);
importers.Add("tiff", defaultImporter);
}
/// <summary>
/// Checks if the specified file extension is supported and returns
/// a suitable <see cref="ImportImage"/> function, if possible.
/// </summary>
/// <param name="fileExtension">
/// The file extension with or without the preceding period.
/// This parameter is case-insensitive.
/// </param>
/// <param name="importerFunction">
/// Will be used to store the <see cref="ImportImage"/> function,
/// if the format is supported, or null if the format is not supported.
/// </param>
/// <returns>
/// <c>true</c> if files with the specified extension are supported,
/// <c>false</c> otherwise.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Is thrown when <paramref name="fileExtension"/> is null.
/// </exception>
public virtual bool Supports(string fileExtension,
out ImportImage importerFunction)
{
if (fileExtension == null)
{
throw new ArgumentNullException("fileExtension");
}
fileExtension = fileExtension.TrimStart('.').ToLowerInvariant();
return(importers.TryGetValue(fileExtension, out importerFunction));
}
protected virtual void OnNewImageLoaded(string selectedFile)
{
ImportImage?.Invoke(selectedFile);
}
