private ResizedImage GetResizedImage(Image image, int proposedWidth, int proposedHeight)
{
ResizedImage retVal;
int newWidth;
int newHeight;
//TODO: the max_height, max_width needs to be more flexible - write unit test around it too
if (image.Width < proposedWidth && image.Height < proposedHeight)
{
//image was smaller than proposed dimensions - use original
newWidth = image.Width;
newHeight = image.Height;
}
else
{
//image was larger than proposed dimensions - resize it
decimal diffRatio;
if (image.Width > image.Height)
{
diffRatio = (decimal)proposedWidth / image.Width;
newWidth = proposedWidth;
decimal tempHeight = image.Height * diffRatio;
newHeight = (int)tempHeight;
}
else
{
diffRatio = (decimal)proposedHeight / image.Height;
newHeight = proposedHeight;
decimal tempWidth = image.Width * diffRatio;
newWidth = (int)tempWidth;
}
}
using (var resizedBitmap = new Bitmap(newWidth, newHeight))
{
using (Graphics newGraphic = Graphics.FromImage(resizedBitmap))
{
retVal = new ResizedImage { Image = new MemoryStream(), Width = newWidth, Height = newHeight };
using (var encoderParameters = new EncoderParameters(1))
{
encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 90L);
newGraphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
newGraphic.SmoothingMode = SmoothingMode.HighQuality;
newGraphic.CompositingQuality = CompositingQuality.HighQuality;
newGraphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
newGraphic.DrawImage(image, 0, 0, newWidth, newHeight);
resizedBitmap.Save(retVal.Image, GetImageCodec(image.RawFormat), encoderParameters);
//Stream is NOT disposed here - it is sent back as an open stream
retVal.Image.Position = 0;
}
}
}
return retVal;
}
private void DisposeImageIfNotEmpty(ResizedImage resizedImage, IList<Exception> exceptions)
{
if (resizedImage != null)
{
try
{
resizedImage.Image.Dispose();
}
catch (Exception ex)
{
exceptions.Add(ex);
}
}
}
