private PdfFontDescriptor MakeFontDescriptor(string fontName, IFontMetric metrics)
{
IFontDescriptor descriptor = metrics.Descriptor;
PdfFontDescriptor pdfDescriptor = new PdfFontDescriptor(
fontName, NextObjectId());
pdfDescriptor.Ascent = new PdfNumeric(metrics.Ascender);
pdfDescriptor.CapHeight = new PdfNumeric(metrics.CapHeight);
pdfDescriptor.Descent = new PdfNumeric(metrics.Descender);
pdfDescriptor.Flags = new PdfNumeric(descriptor.Flags);
pdfDescriptor.ItalicAngle = new PdfNumeric(descriptor.ItalicAngle);
pdfDescriptor.StemV = new PdfNumeric(descriptor.StemV);
PdfArray array = new PdfArray();
array.AddArray(descriptor.FontBBox);
pdfDescriptor.FontBBox = array;
return pdfDescriptor;
}
public async Task SaveAsync(Stream stream)
{
var pdfDocumentCatalog = new PdfDocumentCatalog();
var pdfPageTree = new PdfPageTree();
pdfDocumentCatalog.PagesReference = pdfPageTree.Reference;
var pdfFonts = new List <PdfFont>();
var pdfFontDescriptors = new List <PdfFontDescriptor>();
var pdfCharWidthsObjects = new List <PdfCharWidths>();
var pdfFontStreams = new List <PdfFontStream>();
var fontToPdfFont = new Dictionary <Font, PdfFont>();
foreach (var font in Fonts)
{
var fontStream = new PdfFontStream();
fontStream.Filter = PdfStreamFilter.FlateDecode;
fontStream.Stream = new PdfStream(File.ReadAllBytes(font.FileName));
pdfFontStreams.Add(fontStream);
var fontInfo = font.FontInfo;
var factor = 1000.0 / fontInfo.HeadTable.UnitsPerEm;
var charWidths = new int[129];
for (int i = 0; i < 129; i++)
{
fontInfo.CharacterMapTable.Encodings.Last().Value.TryGetGlyphId(i, out var glyphIndex);
charWidths[i] = fontInfo.HorizontalMetricsTable.HMetrics[glyphIndex].AdvanceWidth; // Don't normalize
//fontInfo.CharacterMapTable.Encodings.Last().Value.TryGetGlyphId(i, out var glyphIndex);
//var blockLocation = fontInfo.IndexLocationTable.GetLocation(glyphIndex);
//var glyphHeader = fontInfo.GlyphTable.ReadHeader(blockLocation);
//charWidths[i] = glyphHeader.XMax - glyphHeader.XMin;
}
var pdfCharWidths = new PdfCharWidths {
Widths = new PdfArray(charWidths.Select(x => (PdfObject) new PdfReal(Normalize(x, factor))).ToList())
};
pdfCharWidthsObjects.Add(pdfCharWidths);
var pdfFontDescriptor = new PdfFontDescriptor
{
Ascent = new PdfInteger(Normalize(fontInfo.HorizontalHeaderTable.Ascender, factor)),
Descent = new PdfInteger(Normalize(fontInfo.HorizontalHeaderTable.Descender, factor)),
FontName = new PdfName(font.Name),
FontBBox = new PdfRectangle(Normalize(fontInfo.HeadTable.XMin, factor),
Normalize(fontInfo.HeadTable.YMin, factor),
Normalize(fontInfo.HeadTable.XMax, factor),
Normalize(fontInfo.HeadTable.YMax, factor)),
FontWeight = new PdfInteger(fontInfo.Os2Table.UsWeightClass),
AvgWidth = new PdfInteger(Normalize(fontInfo.Os2Table.XAvgCharWidth, factor)),
CapHeight = new PdfInteger(Normalize(fontInfo.Os2Table.SCapHeight, factor)),
ItalicAngle = new PdfReal(Normalize((double)fontInfo.PostScriptTable.ItalicAngle, factor)),
// MaxWidth = new PdfInteger(0), // TODO
// XHeight = new PdfInteger(0), // TODO
StemV = new PdfInteger(50), // TODO
Flags = new PdfInteger(32), // TODO
FontFile2 = new PdfIndirectObjectReference(fontStream)
};
pdfFontDescriptors.Add(pdfFontDescriptor);
var pdfFont = new PdfFont
{
Subtype = new PdfName(font.Type),
BaseFont = new PdfName(font.Name),
Encoding = new PdfName(font.Encoding.ToString()),
FontDescriptor = pdfFontDescriptor.Reference,
Widths = pdfCharWidths.Reference,
FirstChar = new PdfInteger(0),
LastChar = new PdfInteger(127)
};
pdfFonts.Add(pdfFont);
fontToPdfFont[font] = pdfFont;
}
pdfPageTree.MediaBox = new PdfRectangle(0, 0, DefaultPageWidth, DefaultPageHeight);
pdfPageTree.Resources = new PdfResources
{
Fonts = new PdfFontResources()
};
foreach (var font in Fonts)
{
pdfPageTree.Resources.Fonts.Add($"F{_nextFontId++}", fontToPdfFont[font].Reference);
}
var pdfContentStreams = new List <PdfContentStream>();
var pdfPages = new List <PdfPage>();
foreach (var page in Pages)
{
var pdfPage = new PdfPage();
pdfPages.Add(pdfPage);
pdfPage.Parent = pdfPageTree.Reference;
if (page.Unit != 1.0)
{
pdfPage.UserUnit = new PdfReal(page.Unit);
}
if (page.Width != DefaultPageWidth || page.Height != DefaultPageHeight)
{
pdfPage.MediaBox = new PdfRectangle(0, 0, page.Width, page.Height);
}
var instructions = page.Paint();
if (!string.IsNullOrWhiteSpace(instructions))
{
var pdfContentStream = new PdfContentStream
{
Stream = new PdfStream(Encoding.ASCII.GetBytes(instructions)),
// Filter = PdfStreamFilter.FlateDecode // Temporarily no using. Uncomment after development complete
};
pdfContentStreams.Add(pdfContentStream);
pdfPage.Contents = pdfContentStream.Reference;
}
}
pdfPageTree.Kids = pdfPages.Select(x => x.Reference).ToList();
var writer = new PdfWriter(stream);
await writer.WriteAsync(pdfDocumentCatalog);
await writer.WriteAsync(pdfPageTree);
foreach (var pdfFont in pdfFonts)
{
await writer.WriteAsync(pdfFont);
}
foreach (var pdfFontDescriptor in pdfFontDescriptors)
{
await writer.WriteAsync(pdfFontDescriptor);
}
foreach (var pdfCharWidths in pdfCharWidthsObjects)
{
await writer.WriteAsync(pdfCharWidths);
}
foreach (var pdfFontStream in pdfFontStreams)
{
await writer.WriteAsync(pdfFontStream);
}
foreach (var pdfPage in pdfPages)
{
await writer.WriteAsync(pdfPage);
}
foreach (var pdfContentStream in pdfContentStreams)
{
await writer.WriteAsync(pdfContentStream);
}
await writer.CloseAsync(pdfDocumentCatalog, null);
}
