private static StreamToken WriteContentStream(IReadOnlyList <IGraphicsStateOperation> content)
{
using (var memoryStream = new MemoryStream())
{
foreach (var operation in content)
{
operation.Write(memoryStream);
}
var bytes = memoryStream.ToArray();
var stream = DataCompresser.CompressToStream(bytes);
return(stream);
}
}
public IndirectReferenceToken Write(IPdfStreamWriter writer)
{
using (var memoryStream = new MemoryStream())
{
foreach (var operation in operations)
{
operation.Write(memoryStream);
}
var bytes = memoryStream.ToArray();
var stream = DataCompresser.CompressToStream(bytes);
return(writer.WriteToken(stream));
}
}
/// <summary>
/// Adds the PNG image represented by the input stream at the specified location.
/// </summary>
public AddedImage AddPng(Stream pngStream, PdfRectangle placementRectangle)
{
var png = Png.Open(pngStream);
byte[] data;
var pixelBuffer = new byte[3];
using (var memoryStream = new MemoryStream())
{
for (var rowIndex = 0; rowIndex < png.Height; rowIndex++)
{
for (var colIndex = 0; colIndex < png.Width; colIndex++)
{
var pixel = png.GetPixel(colIndex, rowIndex);
pixelBuffer[0] = pixel.R;
pixelBuffer[1] = pixel.G;
pixelBuffer[2] = pixel.B;
memoryStream.Write(pixelBuffer, 0, pixelBuffer.Length);
}
}
data = memoryStream.ToArray();
}
var compressed = DataCompresser.CompressBytes(data);
var imgDictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Xobject },
{ NameToken.Subtype, NameToken.Image },
{ NameToken.Width, new NumericToken(png.Width) },
{ NameToken.Height, new NumericToken(png.Height) },
{ NameToken.BitsPerComponent, new NumericToken(png.Header.BitDepth) },
{ NameToken.ColorSpace, NameToken.Devicergb },
{ NameToken.Filter, NameToken.FlateDecode },
{ NameToken.Length, new NumericToken(compressed.Length) }
};
var reference = documentBuilder.AddImage(new DictionaryToken(imgDictionary), compressed);
var resources = pageDictionary.GetOrCreateDict(NameToken.Resources);
var xObjects = resources.GetOrCreateDict(NameToken.Xobject);
var key = NameToken.Create($"I{imageKey++}");
xObjects[key] = reference;
currentStream.Add(Push.Value);
// This needs to be the placement rectangle.
currentStream.Add(new ModifyCurrentTransformationMatrix(new[]
{
(decimal)placementRectangle.Width, 0,
0, (decimal)placementRectangle.Height,
(decimal)placementRectangle.BottomLeft.X, (decimal)placementRectangle.BottomLeft.Y
}));
currentStream.Add(new InvokeNamedXObject(key));
currentStream.Add(Pop.Value);
return(new AddedImage(reference.Data, png.Width, png.Height));
}
/// <summary>
/// Adds the PNG image represented by the input stream at the specified location.
/// </summary>
public AddedImage AddPng(Stream pngStream, PdfRectangle placementRectangle)
{
var png = Png.Open(pngStream);
byte[] data;
var pixelBuffer = new byte[3];
using (var memoryStream = new MemoryStream())
{
for (var rowIndex = 0; rowIndex < png.Height; rowIndex++)
{
for (var colIndex = 0; colIndex < png.Width; colIndex++)
{
var pixel = png.GetPixel(colIndex, rowIndex);
pixelBuffer[0] = pixel.R;
pixelBuffer[1] = pixel.G;
pixelBuffer[2] = pixel.B;
memoryStream.Write(pixelBuffer, 0, pixelBuffer.Length);
}
}
data = memoryStream.ToArray();
}
var widthToken = new NumericToken(png.Width);
var heightToken = new NumericToken(png.Height);
IndirectReferenceToken smaskReference = null;
if (png.HasAlphaChannel && documentBuilder.ArchiveStandard != PdfAStandard.A1B && documentBuilder.ArchiveStandard != PdfAStandard.A1A)
{
var smaskData = new byte[data.Length / 3];
for (var rowIndex = 0; rowIndex < png.Height; rowIndex++)
{
for (var colIndex = 0; colIndex < png.Width; colIndex++)
{
var pixel = png.GetPixel(colIndex, rowIndex);
var index = rowIndex * png.Width + colIndex;
smaskData[index] = pixel.A;
}
}
var compressedSmask = DataCompresser.CompressBytes(smaskData);
// Create a soft-mask.
var smaskDictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Xobject },
{ NameToken.Subtype, NameToken.Image },
{ NameToken.Width, widthToken },
{ NameToken.Height, heightToken },
{ NameToken.ColorSpace, NameToken.Devicegray },
{ NameToken.BitsPerComponent, new NumericToken(png.Header.BitDepth) },
{ NameToken.Decode, new ArrayToken(new IToken[] { new NumericToken(0), new NumericToken(1) }) },
{ NameToken.Length, new NumericToken(compressedSmask.Length) },
{ NameToken.Filter, NameToken.FlateDecode }
};
smaskReference = documentBuilder.AddImage(new DictionaryToken(smaskDictionary), compressedSmask);
}
var compressed = DataCompresser.CompressBytes(data);
var imgDictionary = new Dictionary <NameToken, IToken>
{
{ NameToken.Type, NameToken.Xobject },
{ NameToken.Subtype, NameToken.Image },
{ NameToken.Width, widthToken },
{ NameToken.Height, heightToken },
{ NameToken.BitsPerComponent, new NumericToken(png.Header.BitDepth) },
{ NameToken.ColorSpace, NameToken.Devicergb },
{ NameToken.Filter, NameToken.FlateDecode },
{ NameToken.Length, new NumericToken(compressed.Length) }
};
if (smaskReference != null)
{
imgDictionary.Add(NameToken.Smask, smaskReference);
}
var reference = documentBuilder.AddImage(new DictionaryToken(imgDictionary), compressed);
var resources = pageDictionary.GetOrCreateDict(NameToken.Resources);
var xObjects = resources.GetOrCreateDict(NameToken.Xobject);
var key = NameToken.Create($"I{imageKey++}");
xObjects[key] = reference;
currentStream.Add(Push.Value);
// This needs to be the placement rectangle.
currentStream.Add(new ModifyCurrentTransformationMatrix(new[]
{
(decimal)placementRectangle.Width, 0,
0, (decimal)placementRectangle.Height,
(decimal)placementRectangle.BottomLeft.X, (decimal)placementRectangle.BottomLeft.Y
}));
currentStream.Add(new InvokeNamedXObject(key));
currentStream.Add(Pop.Value);
return(new AddedImage(reference.Data, png.Width, png.Height));
}
