protected virtual Stream ConvertSvg(Stream svgInput, SvgMagicOptions options, bool failOnError = false)
{
if (svgInput == null || !svgInput.CanRead)
{
if (failOnError)
{
throw new SvgMagicException("Svg input stream was null or could not be read", HttpStatusCode.NotFound);
}
return(null);
}
var svg = SvgDocument.Open <SvgDocument>(svgInput);
if (svg == null)
{
if (failOnError)
{
throw new SvgMagicException("Unable to open stream as Svg", HttpStatusCode.UnsupportedMediaType);
}
return(null);
}
if ((svg.Height.Type == SvgUnitType.Percentage) || (svg.Width.Type == SvgUnitType.Percentage))
{
if (failOnError)
{
throw new SvgMagicException("Svg's with percentage based dimensions are not supported for fallback conversion", HttpStatusCode.UnsupportedMediaType);
}
return(null);
}
if (options.HasDimensions())
{
svg.Height = options.Height;
svg.Width = options.Width;
}
else if (options.Height > 0)
{
var aspectRatio = svg.Height.Value / svg.Width.Value;
svg.Height = options.Height;
svg.Width = options.Height / aspectRatio;
}
else if (options.Width > 0)
{
var aspectRatio = svg.Width / svg.Height;
svg.Width = options.Width;
svg.Height = options.Width / aspectRatio;
}
else
{
options.Height = float.Parse(svg.Height.Value.ToString());
options.Width = float.Parse(svg.Width.Value.ToString());
}
var outputStream = new MemoryStream();
using (var bmp = svg.Draw())
{
Thread.Sleep(50);
switch (options.Format)
{
case SvgMagicImageFormat.Bmp:
bmp.Save(outputStream, ImageFormat.Bmp);
break;
case SvgMagicImageFormat.Png:
bmp.Save(outputStream, ImageFormat.Png);
break;
case SvgMagicImageFormat.Jpeg:
bmp.Save(outputStream, ImageFormat.Jpeg);
break;
case SvgMagicImageFormat.Gif:
bmp.Save(outputStream, ImageFormat.Gif);
break;
default:
throw new SvgMagicException(string.Format("Unknown image format specified - {0}", options.Format), HttpStatusCode.UnsupportedMediaType);
}
}
return(outputStream);
}
