public static BitmapImage BitmapFromStream(Stream stream, BitmapLoadProperties loadProperties = null)
{
try
{
var properties = Images.GetImageProperties(stream);
var aspect = new AspectRatio(properties.Width, properties.Height);
stream.Seek(0, SeekOrigin.Begin);
var bitmap = new BitmapImage();
bitmap.BeginInit();
if (loadProperties?.MaxDecodePixelWidth > 0 && properties?.Width > loadProperties?.MaxDecodePixelWidth)
{
if (loadProperties.DpiScale != null)
{
bitmap.DecodePixelWidth = (int)Math.Round(loadProperties.MaxDecodePixelWidth * loadProperties.DpiScale.Value.DpiScaleX);
}
else
{
bitmap.DecodePixelWidth = loadProperties.MaxDecodePixelWidth;
}
}
if (loadProperties?.MaxDecodePixelHeight > 0 && properties?.Height > loadProperties?.MaxDecodePixelHeight)
{
if (loadProperties.DpiScale != null)
{
bitmap.DecodePixelHeight = Convert.ToInt32(loadProperties.MaxDecodePixelHeight * loadProperties.DpiScale.Value.DpiScaleY);
}
else
{
bitmap.DecodePixelHeight = loadProperties.MaxDecodePixelHeight;
}
}
if (bitmap.DecodePixelHeight != 0 && bitmap.DecodePixelWidth == 0)
{
bitmap.DecodePixelWidth = (int)Math.Round(aspect.GetWidth(bitmap.DecodePixelHeight));
}
else if (bitmap.DecodePixelWidth != 0 && bitmap.DecodePixelHeight == 0)
{
bitmap.DecodePixelHeight = (int)Math.Round(aspect.GetHeight(bitmap.DecodePixelWidth));
}
bitmap.StreamSource = stream;
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.CreateOptions = BitmapCreateOptions.IgnoreColorProfile;
bitmap.EndInit();
bitmap.Freeze();
return(bitmap);
}
catch (Exception e)
{
logger.Error(e, "Failed to create bitmap from stream.");
return(null);
}
}
public void GetWidthTest(double height, double width, AspectRatio ratio)
{
Assert.AreEqual(width, ratio.GetWidth(height));
}
