/// <summary>
/// Parses the input string to return the correct <see cref="ISupportedImageFormat"/>.
/// </summary>
/// <param name="identifier">
/// The identifier.
/// </param>
/// <returns>
/// The <see cref="ISupportedImageFormat"/>.
/// </returns>
private ISupportedImageFormat ParseFormat(string identifier)
{
identifier = identifier.ToLowerInvariant();
string finalIdentifier = identifier.Equals("png8") ? "png" : identifier;
ISupportedImageFormat newFormat = null;
List <ISupportedImageFormat> formats = ImageProcessorBootstrapper.Instance.SupportedImageFormats.ToList();
ISupportedImageFormat format = formats.FirstOrDefault(f => f.FileExtensions.Any(e => e.Equals(finalIdentifier, StringComparison.InvariantCultureIgnoreCase)));
if (format != null)
{
// Return a new instance as we want to use instance properties.
newFormat = Activator.CreateInstance(format.GetType()) as ISupportedImageFormat;
if (newFormat != null)
{
// I wish this wasn't hard-coded but there's no way I can
// find to preserve the palette.
if (identifier.Equals("png8"))
{
newFormat.IsIndexed = true;
}
else if (identifier.Equals("png"))
{
newFormat.IsIndexed = false;
}
}
}
return(newFormat);
}
public void AlphaIsModified()
{
foreach (ImageFactory imageFactory in this.ListInputImages())
{
Image original = (Image)imageFactory.Image.Clone();
imageFactory.Alpha(50);
ISupportedImageFormat format = imageFactory.CurrentImageFormat;
// The Image class does not support alpha transparency in bitmaps.
if (format.GetType() == typeof(BitmapFormat))
{
AssertionHelpers.AssertImagesAreIdentical(
original,
imageFactory.Image,
"because the alpha operation should not have been applied on {0}",
imageFactory.ImagePath);
}
else
{
AssertionHelpers.AssertImagesAreDifferent(
original,
imageFactory.Image,
"because the alpha operation should have been applied on {0}",
imageFactory.ImagePath);
}
}
}
