private static SKDocumentPdfMetadata MapMetadata(DocumentMetadata metadata)
{
return(new SKDocumentPdfMetadata
{
Title = metadata.Title,
Author = metadata.Author,
Subject = metadata.Subject,
Keywords = metadata.Keywords,
Creator = metadata.Creator,
Producer = metadata.Producer,
Creation = metadata.CreationDate,
Modified = metadata.ModifiedDate,
RasterDpi = metadata.RasterDpi,
EncodingQuality = metadata.ImageQuality,
PdfA = metadata.PdfA
});
}
internal static void RenderPass <TCanvas>(PageContext pageContext, TCanvas canvas, Container content, DocumentMetadata documentMetadata, DebuggingState?debuggingState)
where TCanvas : ICanvas, IRenderingCanvas
{
content.VisitChildren(x => x?.Initialize(pageContext, canvas));
content.VisitChildren(x => (x as IStateResettable)?.ResetState());
canvas.BeginDocument();
var currentPage = 1;
while (true)
{
pageContext.SetPageNumber(currentPage);
debuggingState?.Reset();
var spacePlan = content.Measure(Size.Max);
if (spacePlan.Type == SpacePlanType.Wrap)
{
canvas.EndDocument();
ThrowLayoutException();
}
try
{
canvas.BeginPage(spacePlan);
content.Draw(spacePlan);
}
catch (Exception exception)
{
canvas.EndDocument();
throw new DocumentDrawingException("An exception occured during document drawing.", exception);
}
canvas.EndPage();
if (currentPage >= documentMetadata.DocumentLayoutExceptionThreshold)
{
canvas.EndDocument();
ThrowLayoutException();
}
if (spacePlan.Type == SpacePlanType.FullRender)
{
break;
}
currentPage++;
}
canvas.EndDocument();
void ThrowLayoutException()
{
var message = $"Composed layout generates infinite document. This may happen in two cases. " +
$"1) Your document and its layout configuration is correct but the content takes more than {documentMetadata.DocumentLayoutExceptionThreshold} pages. " +
$"In this case, please increase the value {nameof(DocumentMetadata)}.{nameof(DocumentMetadata.DocumentLayoutExceptionThreshold)} property configured in the {nameof(IDocument.GetMetadata)} method. " +
$"2) The layout configuration of your document is invalid. Some of the elements require more space than is provided." +
$"Please analyze your documents structure to detect this element and fix its size constraints.";
throw new DocumentLayoutException(message)
{
ElementTrace = debuggingState?.BuildTrace() ?? "Debug trace is available only in the DEBUG mode."
};
}
}
public ImageCanvas(DocumentMetadata metadata)
{
Metadata = metadata;
}
public PdfCanvas(Stream stream, DocumentMetadata documentMetadata)
: base(SKDocument.CreatePdf(stream, MapMetadata(documentMetadata)))
{
}
public XpsCanvas(Stream stream, DocumentMetadata documentMetadata)
: base(SKDocument.CreateXps(stream, documentMetadata.RasterDpi))
{
}
