/// <summary>
/// Loads image from data URI
/// </summary>
/// <param name="uri">data URI</param>
/// <returns>loaded SVG image object, or null when loading was not successful</returns>
private static SKSvg LoadImageFromDataUri(Uri uri)
{
string text = uri.OriginalString;
string?svgText = null;
if (text.StartsWith(SvgConstants.DataUriPlainPrefix, StringComparison.InvariantCultureIgnoreCase))
{
svgText = text.Substring(SvgConstants.DataUriPlainPrefix.Length);
}
else if (text.StartsWith(SvgConstants.DataUriBase64Prefix, StringComparison.InvariantCultureIgnoreCase))
{
svgText = text.Substring(SvgConstants.DataUriBase64Prefix.Length);
var base64EncodedBytes = Convert.FromBase64String(svgText);
svgText = Encoding.UTF8.GetString(base64EncodedBytes);
}
if (svgText == null)
{
throw new FormatException("Invalid SVG image text format: " + uri.OriginalString);
}
var svg = new SKSvg();
svg.FromSvg(svgText);
return(svg);
}
public static SKSvg?LoadSvg(this string?str)
{
if (str == null)
{
return(null);
}
var svg = new SKSvg();
svg.FromSvg(str);
return(svg);
}
public static BitmapInfo LoadBitmap(object bitmapStream)
{
// todo: Our BitmapRegistry stores not only bitmaps. Perhaps we should store a class in it
// which has all information. So we should have a SymbolImageRegistry in which we store a
// SymbolImage. Which holds the type, data and other parameters.
if (bitmapStream is string str)
{
if (str.ToLower().Contains("<svg"))
{
var svg = new SKSvg();
svg.FromSvg(str);
return(new BitmapInfo {
Svg = svg
});
}
}
if (bitmapStream is Stream stream)
{
if (stream.IsSvg())
{
var svg = new SKSvg();
svg.Load(stream);
return(new BitmapInfo {
Svg = svg
});
}
var image = SKImage.FromEncodedData(SKData.CreateCopy(stream.ToBytes()));
return(new BitmapInfo {
Bitmap = image
});
}
if (bitmapStream is Sprite sprite)
{
return(new BitmapInfo {
Sprite = sprite
});
}
return(null);
}