Lxman.PdfLibrary.Rendering.SkiaSharp 0.0.9-beta

PdfLibrary

A comprehensive .NET library for parsing, rendering, and creating PDF documents. Built with C# and targeting .NET 10.

Features

PDF Rendering

• Full PDF 1.x and 2.0 parsing support
• High-quality rendering using SkiaSharp
• Support for complex graphics operations (paths, clipping, transparency)
• Comprehensive color space support (DeviceRGB, DeviceCMYK, DeviceGray, ICCBased, Separation, Lab)
• Image handling (JPEG, PNG, CCITT, JBIG2, JPEG2000)
• Font rendering (Type1, TrueType, CID, embedded fonts)
• Text extraction and positioning

PDF Creation (Fluent Builder API)

• Intuitive fluent API for document creation
• Text with full styling (fonts, colors, spacing)
• Vector graphics (rectangles, circles, lines, paths)
• Image embedding (JPEG, PNG)
• Interactive forms (text fields, checkboxes, radio buttons, dropdowns)
• Annotations (links, notes, highlights)
• Bookmarks/Outlines with hierarchical navigation
• Page labels (custom numbering schemes)
• Layers (Optional Content Groups)
• Encryption (RC4, AES-128, AES-256)
• Custom font embedding (TrueType, OpenType)

Project Structure

PDF/
├── PdfLibrary/                       # Core library
│   ├── Document/                     # PDF document model
│   ├── Content/                      # Content stream processing
│   ├── Rendering/                    # Rendering pipeline
│   ├── Builder/                      # Fluent API for PDF creation
│   ├── Fonts/                        # Font handling
│   ├── Images/                       # Image decompression
│   ├── ColorSpaces/                  # Color space support
│   ├── Parsing/                      # PDF parsing (lexer, parser)
│   └── Security/                     # Encryption/decryption
├── PdfLibrary.Rendering.SkiaSharp/   # SkiaSharp render target
├── PdfLibrary.Tests/                 # Unit tests
├── PdfLibrary.Integration/           # Integration tests
├── PdfLibrary.Wpf.Viewer/            # WPF PDF viewer application
├── Compressors/                      # Image decompression libraries
│   ├── Compressors.Lzw/              # LZW decompression
│   │   └── Compressors.Lzw.Tests/
│   ├── Compressors.Ccitt/            # CCITT fax (Group 3/4)
│   │   └── Compressors.Ccitt.Tests/
│   ├── Compressors.Jbig2/            # JBIG2 decompression
│   │   └── Compressors.Jbig2.Tests/
│   ├── Compressors.Jpeg/             # JPEG (DCT) decompression
│   │   └── Compressors.Jpeg.Tests/
│   └── Compressors.Jpeg2000/         # JPEG2000 (legacy)
│       └── Compressors.Jpeg2000.Tests/
├── FontParser/                       # TrueType/OpenType parsing
├── Logging/                          # Logging infrastructure
└── Docs/                             # Documentation

Quick Start

Rendering a PDF

using PdfLibrary.Structure;
using PdfLibrary.Rendering.SkiaSharp;

// Load a PDF document
using var stream = File.OpenRead("document.pdf");
var document = PdfDocument.Load(stream);

// Get the page to render
var page = document.GetPage(0);  // 0-based index

// Render to file using the fluent API
page.Render(document)
    .WithScale(1.0)  // 1.0 = 72 DPI
    .ToFile("output.png");

// Or render to SKImage for further processing
using var image = page.Render(document)
    .WithDpi(144)  // 2x resolution
    .ToImage();

Creating a PDF

using PdfLibrary.Builder;

PdfDocumentBuilder.Create()
    .WithMetadata(meta => meta
        .Title("My Document")
        .Author("John Doe"))
    .AddPage(page => page
        .AddText("Hello, World!", 100, 700)
            .WithFont("Helvetica-Bold")
            .WithSize(24)
            .WithColor(PdfColor.Blue)
        .AddRectangle(100, 650, 200, 30)
            .Fill(PdfColor.LightGray)
            .Stroke(PdfColor.Black))
    .AddPage(page => page
        .AddText("Page 2", 100, 700))
    .AddBookmark("Page 1", 0)
    .AddBookmark("Page 2", 1)
    .Save("output.pdf");

Creating a Form

PdfDocumentBuilder.Create()
    .AddPage(page => page
        .AddText("Registration Form", 100, 750)
            .WithSize(18)
            .Bold()
        .AddText("Name:", 100, 700)
        .AddTextField("name", 170, 695, 200, 25)
            .Required()
        .AddText("Email:", 100, 660)
        .AddTextField("email", 170, 655, 200, 25)
        .AddText("I agree to terms:", 100, 620)
        .AddCheckbox("agree", 220, 618, 18, 18))
    .WithAcroForm(form => form.SetNeedAppearances(true))
    .Save("form.pdf");

Requirements

• .NET 10.0 or later
• SkiaSharp (for rendering)
• SixLabors.ImageSharp (for image processing)

Building

# Clone the repository
git clone https://github.com/yourusername/PDF.git
cd PDF

# Build the solution
dotnet build PdfProcessor.slnx

# Run tests
dotnet test PdfLibrary.Tests/PdfLibrary.Tests.csproj

Documentation

• Fluent API Reference - Complete guide to the PDF creation API
• Getting Started - Step-by-step introduction
• Architecture - Technical architecture overview

Supported PDF Features

Content Streams

• Graphics state operators (q, Q, cm, w, J, j, M, d, ri, i, gs)
• Path operators (m, l, c, v, y, h, re, S, s, f, F, f*, B, B*, b, b*, n, W, W*)
• Text operators (BT, ET, Tc, Tw, Tz, TL, Tf, Tr, Ts, Td, TD, Tm, T*, Tj, TJ, ', ")
• Color operators (CS, cs, SC, SCN, sc, scn, G, g, RG, rg, K, k)
• XObject operators (Do)
• Inline image operators (BI, ID, EI)
• Marked content operators (MP, DP, BMC, BDC, EMC)

Color Spaces

• DeviceGray, DeviceRGB, DeviceCMYK
• CalGray, CalRGB, Lab
• ICCBased
• Indexed
• Separation, DeviceN
• Pattern (tiling and shading)

Fonts

• Type1, Type1C (CFF)
• TrueType
• Type0 (CID fonts)
• Type3
• Embedded and system fonts

Images

• DCTDecode (JPEG)
• FlateDecode (PNG/zlib)
• LZWDecode
• CCITTFaxDecode (Group 3 and 4)
• JBIG2Decode
• JPXDecode (JPEG2000)
• RunLengthDecode
• ASCII85Decode, ASCIIHexDecode

Security

• RC4 40-bit and 128-bit encryption
• AES 128-bit and 256-bit encryption
• Permission flags

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

Development Setup

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

Code Style

• Follow C# coding conventions
• Use meaningful variable and method names
• Add XML documentation for public APIs
• Include unit tests for new features

Acknowledgments

• SkiaSharp - 2D graphics library
• ImageSharp - Image processing library
• Serilog - Logging framework