private static Blob GetHarfBuzzBlob(SKStreamAsset asset)
{
if (asset == null)
{
throw new ArgumentNullException(nameof(asset));
}
Blob blob;
var size = asset.Length;
var memoryBase = asset.GetMemoryBase();
if (memoryBase != IntPtr.Zero)
{
// the underlying stream is really a mamory block
// so save on copying and just use that directly
blob = new Blob(memoryBase, size, MemoryMode.ReadOnly, () => asset.Dispose());
}
else
{
// this could be a forward-only stream, so we must copy
var ptr = Marshal.AllocCoTaskMem(size);
asset.Read(ptr, size);
blob = new Blob(ptr, size, MemoryMode.ReadOnly, () => Marshal.FreeCoTaskMem(ptr));
}
// make immutable for performance?
blob.MakeImmutable();
return(blob);
}
public static Blob ToHarfBuzzBlob(this SKStreamAsset asset)
{
if (asset == null)
{
throw new ArgumentNullException(nameof(asset));
}
var size = asset.Length;
Blob blob;
var memoryBase = asset.GetMemoryBase();
if (memoryBase != IntPtr.Zero)
{
blob = new Blob(memoryBase, size, MemoryMode.ReadOnly, () => asset.Dispose());
}
else
{
var ptr = Marshal.AllocCoTaskMem(size);
asset.Read(ptr, size);
blob = new Blob(ptr, size, MemoryMode.ReadOnly, () => Marshal.FreeCoTaskMem(ptr));
}
blob.MakeImmutable();
return(blob);
}
private void LoadedDocument_SubstituteFont(object sender, PdfFontEventArgs args)
{
//Get the font name
string fontName = args.FontName.Split(',')[0];
//Get the font style
PdfFontStyle fontStyle = args.FontStyle;
SKTypefaceStyle sKFontStyle = SKTypefaceStyle.Normal;
if (fontStyle != PdfFontStyle.Regular)
{
if (fontStyle == PdfFontStyle.Bold)
{
sKFontStyle = SKTypefaceStyle.Bold;
}
else if (fontStyle == PdfFontStyle.Italic)
{
sKFontStyle = SKTypefaceStyle.Italic;
}
else if (fontStyle == (PdfFontStyle.Italic | PdfFontStyle.Bold))
{
sKFontStyle = SKTypefaceStyle.BoldItalic;
}
}
SKTypeface typeface = SKTypeface.FromFamilyName(fontName, sKFontStyle);
SKStreamAsset typeFaceStream = typeface.OpenStream();
MemoryStream memoryStream = null;
if (typeFaceStream != null && typeFaceStream.Length > 0)
{
//Create fontData from type face stream.
byte[] fontData = new byte[typeFaceStream.Length - 1];
typeFaceStream.Read(fontData, typeFaceStream.Length);
typeFaceStream.Dispose();
//Create the new memory stream from font data.
memoryStream = new MemoryStream(fontData);
}
//set the font stream to the event args.
args.FontStream = memoryStream;
}