public Bitmap RetrieveBitmap(string key, int headerSize = 0)
{
ValidateKey(key);
Argument.Assert.IsNotNegative(headerSize, nameof(headerSize));
object result = Retrieve(key);
if (result == null)
{
return(null);
}
Bitmap bitmap = result as Bitmap;
if (bitmap != null)
{
return(bitmap);
}
byte[] imageBytes = result as byte[];
if (imageBytes != null)
{
bitmap = MemoryBitmap.FromBuffer(imageBytes, headerSize);
}
return(bitmap);
}
/// <summary>
/// Creates a new <see cref="ImageProperties" /> from the supplied <see cref="Stream" />.
/// </summary>
/// <param name="stream">The stream.</param>
/// <returns>A new <see cref="ImageProperties" />.</returns>
/// <exception cref="ArgumentException">
/// The <paramref name="stream" /> does not
/// contain a valid <see cref="Bitmap" /> object.
/// </exception>
/// <exception cref="ArgumentNullException">
/// The <paramref name="stream" /> is
/// null.
/// </exception>
public ImageProperties(Stream stream)
{
Argument.Assert.IsNotNull(stream, "stream");
Bitmap = MemoryBitmap.FromStream(stream);
if (Bitmap == null)
{
throw new ArgumentException("The stream does not contain a valid bitmap object.", "stream");
}
}
public void CreateThumbnailFromJpg()
{
using (Image image = Image.FromFile(@"Drawing\Resources\ULPT-L.jpg"))
using (Image thumb = Thumbnail.FromImage(image, 134, 107))
{
using (MemoryStream stream = new MemoryStream())
{
JpgFormat.Save(stream, thumb, 80);
using (Bitmap bitmap = MemoryBitmap.FromStream(stream))
{
Assert.AreEqual(new Size(134, 107), bitmap.Size);
}
}
}
}
private static Bitmap CreateFromIndexed(Image image, int maxWidth, int maxHeight)
{
using (Bitmap dst = new Bitmap(maxWidth, maxHeight))
{
using (Graphics g = Graphics.FromImage(dst))
{
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(image, 0, 0, dst.Width, dst.Height);
}
using (MemoryStream stream = new MemoryStream())
{
dst.Save(stream, ImageFormat.Png);
return(MemoryBitmap.FromStream(stream));
}
}
}
