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Allow rendering with Docnet PDF

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Michael Babienco
2026-03-02 16:24:05 +09:00
parent 5f99d0e4eb
commit d51017bb73
4 changed files with 129 additions and 26 deletions
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TODO.txt
+29
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@@ -1,3 +1,32 @@
magick "2026-01-29 — \$210 — WORK PERMIT.pdf" -background white -alpha background -alpha off -density 288 -resize 25% page-%03d.jpg
https://github.com/dlemstra/Magick.NET/blob/main/docs/ConvertPDF.md
https://stackoverflow.com/questions/65089839/add-an-external-pdf-page-to-pdfsharp-migradoc
https://github.com/mephraim/ghostscriptsharp
https://stackoverflow.com/a/71485279/3938401
need a PDF viewer that works with annotations
https://github.com/BobLd/PdfPig.Rendering.Skia/ works but quality is low for some reason, I don't know why. probably need a bug report or some option that is hidden.
using (var document = UglyToad.PdfPig.PdfDocument.Open(filePath, UglyToad.PdfPig.Rendering.Skia.SkiaRenderingParsingOptions.Instance))
{
document.AddSkiaPageFactory(); // Same as document.AddPageFactory<SKPicture, SkiaPageFactory>() and document.AddPageFactory<PdfPageSize, PageSizeFactory>()
for (int p = 1; p <= document.NumberOfPages; p++)
{
using var skBitmap = document.GetPageAsSKBitmap(p, 1);
using (var fs = new FileStream(Path.Combine(convertedDir, $"{fileName}_{p}PIG.jpeg"), FileMode.Create))
using (var ms = document.GetPageAsPng(p, 1, 4))
{
MemoryStream memoryStream = new MemoryStream();
skBitmap.Encode(memoryStream, SkiaSharp.SKEncodedImageFormat.Jpeg, 100);
memoryStream.Position = 0L;
ms.WriteTo(fs);
}
}
}
https://github.com/GowenGit/docnet -- may need to fork this and publish our own package if some OS doesn't work
*-add more items
*-save last opened folder to settings somewhere
src/MayShow.csproj
+2
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@@ -51,5 +51,7 @@
<PackageReference Include="Deadpikle.AvaloniaProgressRing" Version="0.10.11-preview20251127001" />
<PackageReference Include="DialogHost.Avalonia" Version="0.10.4" />
<PackageReference Include="Xaml.Behaviors.Interactions.DragAndDrop.DataGrid" Version="11.3.9.5" />
<PackageReference Include="Docnet.Core" Version="2.6.0" />
<PackageReference Include="SixLabors.ImageSharp" Version="3.1.12" />
</ItemGroup>
</Project>
src/Models/Settings.cs
+9
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@@ -12,10 +12,12 @@ namespace MayShow.Models;
class Settings : ChangeNotifier
{
private string _lastUsedPath;
private bool _useDocnetPDFImageRendering;
public Settings()
{
_lastUsedPath = "";
_useDocnetPDFImageRendering = true;
}
[JsonInclude]
@@ -25,6 +27,13 @@ class Settings : ChangeNotifier
set { _lastUsedPath = value; NotifyPropertyChanged(); }
}
[JsonInclude]
public bool UseDocnetPFDImageRendering
{
get => _useDocnetPDFImageRendering;
set { _useDocnetPDFImageRendering = value; NotifyPropertyChanged(); }
}
public static string GetSettingsFileName()
{
return "settings.json";
src/ViewModels/MainViewModel.cs
+68 -5
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@@ -21,6 +21,14 @@ using MayShow.Interfaces;
using MayShow.Models;
using MayShows.Helpers;
using Docnet.Core.Models;
using Docnet.Core;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using System.Reflection.Metadata.Ecma335;
using Docnet.Core.Readers;
namespace MayShow.ViewModels;
class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
@@ -708,7 +716,7 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
filePath = convertedOutputPath;
LogInfo(string.Format("Saved adjusted image to JPEG; file path is now {0}", filePath));
}
}
// write to PDF
var paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center;
var image = paragraph.AddImage(filePath);
@@ -721,14 +729,67 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
{
image.Width = imageWidth; // can't be too wide now...not sure why...maybe due to margins...
}
LogInfo(string.Format("Added image: {0} ({1})", file.Title, filePath));
if (isPDF)
}
else
{
// add other PDF pages
// need to render PDF to images
if (_settings.UseDocnetPFDImageRendering)
{
// render using Docnet library (which utilizes pdfium, the chrome renderer)
string RenderPdfPageToImage(IDocReader docReader, int pgNum)
{
Console.WriteLine("rendering pg " + pgNum);
using var pageReader = docReader.GetPageReader(pgNum);
var rawBytes = pageReader.GetImage(RenderFlags.RenderAnnotations);
var width = pageReader.GetPageWidth();
var height = pageReader.GetPageHeight();
using var img = Image.LoadPixelData<Bgra32>(rawBytes, width, height);
// you are likely going to want this as well otherwise you might end up with transparent parts.
img.Mutate(x => x.BackgroundColor(SixLabors.ImageSharp.Color.White));
var pdfPageImageOutputPath = Path.Combine(convertedDir, info.Name + "-Page-"
+ (pgNum + 1).ToString().PadLeft(3, '0') + ".jpg");
img.Save(pdfPageImageOutputPath);
return pdfPageImageOutputPath;
}
// render all pages to images
using var docReader = DocLib.Instance.GetDocReader(
filePath,
new PageDimensions(1080, 1920)); // TODO: are these dims right?
// add to document
var pgCount = docReader.GetPageCount();
if (pgCount > 0)
{
var convertedPdfImagePath = RenderPdfPageToImage(docReader, 0);
imageTitlePar.AddText(string.Format(" (PDF with {0} page{1}) ",
pgCount,
pgCount == 1 ? "" : "s"));
var paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center;
var image = paragraph.AddImage(convertedPdfImagePath);
for (var j = 1; j < pgCount; j++)
{
section.AddPageBreak();
paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center;
convertedPdfImagePath = RenderPdfPageToImage(docReader, j);
image = paragraph.AddImage(convertedPdfImagePath);
image.LockAspectRatio = true;
image.Width = imageWidth;
}
}
}
else
{
// render first page (eventually need to improve code to just do everything in a loop)
var paragraph = section.AddParagraph();
paragraph.Format.Alignment = ParagraphAlignment.Center;
var image = paragraph.AddImage(filePath);
image.LockAspectRatio = true;
image.Width = imageWidth; // can't be too wide now...not sure why...maybe due to margins...
// render other PDF pages, if any
// see: https://stackoverflow.com/a/65091204/3938401
var pdfFileToAdd = PdfReader.Open(filePath, PdfDocumentOpenMode.Import);
var pgCount = pdfFileToAdd.PageCount;
pdfFileToAdd.Close();
imageTitlePar.AddText(string.Format(" (PDF with {0} page{1}) ",
pgCount,
pgCount == 1 ? "" : "s"));
@@ -742,6 +803,8 @@ class MainViewModel : BaseViewModel, IFontResolver, ICanCheckShutdown
image.Width = imageWidth;
}
}
}
LogInfo(string.Format("Added image: {0} ({1})", file.Title, filePath));
hasAddedData = true;
}
var pdfRenderer = new PdfDocumentRenderer