PDF printing raster or pdf_crypto parsing issue

Describe the bug

Particular PDF only rendering the top right quarter of the PDF (on iOS and web at least)

To Reproduce Code snippet to reproduce the behavior:

final pdf = pw.Document.load(
   pdf_crypto.PdfDocumentParser(bytes),
);
Uint8List pdfBytes = await pdf.save();

Expected behavior

Full page of the PDF is converted to a new PDF

Screenshots

top_right_of_pdf

It seems like the issue is with the parsing of only the 2 and 3rd index of MediaBox within pdf_crypto document.dart mergeDocument() , but the code below doesn't solve the issue for some reason

double lowerLeftX = (mb.values[0] as PdfNum).value.toDouble().abs();
double lowerLeftY = (mb.values[1] as PdfNum).value.toDouble().abs();
double upperRightX = (mb.values[2] as PdfNum).value.toDouble().abs();
double upperRightY = (mb.values[3] as PdfNum).value.toDouble().abs();
format = PdfPageFormat(
   lowerLeftX + upperRightX,
   lowerLeftY + upperRightY,
);

Inspecting the contents of the pdf it looks like the CropBox and MediaBox 0 and 1 index are negative values

/CropBox[-1224 -792 1224 792]/MediaBox[-1224 -792 1224 792]

Full image correctly rasterized (edited for confidentiality) full_image

Flutter Doctor

[✓] Flutter (Channel stable, 3.10.5, on macOS 14.2.1 23C71 darwin-arm64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 15.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✓] VS Code (version 1.85.1)
[✓] Connected device (3 available)
[✓] Network resources

• No issues found!

Desktop (please complete the following information):

[x] iOS
[ ] Android
[x] Browser
[ ] Windows
[ ] Linux

Smartphone (please complete the following information):

Device: [e.g. iPad Gen 9]
OS: [e.g. iOS16.3.1]

DavBfr / dart_pdf

PDF printing raster or pdf_crypto parsing issue #1572