private PageBacking LoadBackground(TemplateProject project, int sourcePageIndex, TemplatePage pageDef)
{
var backing = new PageBacking();
if (_basePdf is null && !string.IsNullOrWhiteSpace(project.BasePdfFile !))
{
using var fileStream = _files.Load(project.BasePdfFile);
_basePdf = PdfReader.Open(fileStream, PdfDocumentOpenMode.Import); // Must use import mode to copy pages across
}
if (_basePdf != null)
{
backing.ExistingPage = _basePdf.Pages[sourcePageIndex];
}
if (!string.IsNullOrWhiteSpace(pageDef.BackgroundImage !))
{
using var fileStream = _files.Load(project.BasePdfFile);
backing.BackgroundImage = XImage.FromStream(fileStream);
}
return(backing);
}
/// <summary>
/// Render a prepared page into a PDF document
/// </summary>
private Result <Nothing> OutputPage(PdfDocument document, DocumentPage pageToRender, XFont font, PageBacking background, int pageIndex, int pageTotal)
{
var pageDef = pageToRender.Definition;
// If we have a source PDF, and we aren't trying to render a blank page, then import the page
var shouldCopyPdfPage = background.ExistingPage != null && pageDef.RenderBackground;
var page = shouldCopyPdfPage ? document.AddPage(background.ExistingPage !) : document.AddPage(/*blank*/);
// If dimensions are silly, reset to A4
if (pageDef.WidthMillimetres < 10 || pageDef.WidthMillimetres > 1000)
{
pageDef.WidthMillimetres = 210;
}
if (pageDef.HeightMillimetres < 10 || pageDef.HeightMillimetres > 1000)
{
pageDef.HeightMillimetres = 297;
}
// Set the PDF page size (in points under the hood)
page.Width = XUnit.FromMillimeter(pageDef.WidthMillimetres);
page.Height = XUnit.FromMillimeter(pageDef.HeightMillimetres);
using var gfx = XGraphics.FromPdfPage(page);
gfx.Save();
if (shouldCopyPdfPage && background.ExistingPage !.Rotate != 0)
{
// Match visual-rotations on page
var centre = new XPoint(0, 0);
var visualRotate = background.ExistingPage !.Rotate % 360; // degrees, spec says it should be a multiple of 90.
var angle = 360.0 - visualRotate;
gfx.RotateAtTransform(angle, centre);
switch (visualRotate)
{
case 90:
gfx.TranslateTransform(-page.Height.Point, 0);
break;
case 180:
gfx.TranslateTransform(-page.Width.Point, -page.Height.Point);
break;
case 270:
gfx.TranslateTransform(-page.Height.Point / 2.0, -page.Height.Point); // this one is a guess, as I don't have an example
break;
default:
throw new Exception("Unhandled visual rotation case");
}
if (background.ExistingPage.Orientation == PageOrientation.Landscape)
{
(page.Width, page.Height) = (page.Height, page.Width);
}
}
// Draw background at full page size
_loadingTimer.Start();
if (pageDef.RenderBackground && background.BackgroundImage != null)
{
var destRect = new XRect(0, 0, (float)page.Width.Point, (float)page.Height.Point);
gfx.DrawImage(background.BackgroundImage, destRect);
}
_loadingTimer.Stop();
// Do default scaling
var fx = page.Width.Point / page.Width.Millimeter;
var fy = page.Height.Point / page.Height.Millimeter;
// If using an image, work out the bitmap -> page adjustment
if (background.BackgroundImage != null)
{
fx = page.Width.Point / background.BackgroundImage.PixelWidth;
fy = page.Height.Point / background.BackgroundImage.PixelHeight;
}
// Draw each box.
foreach (var boxDef in pageToRender.DocumentBoxes)
{
var result = RenderBox(font, boxDef, fx, fy, gfx, pageToRender, pageIndex, pageTotal);
if (result.IsFailure)
{
return(result);
}
}
gfx.Restore();
return(Result.Success());
}
