NiPdf

Nipdf is a PDF file reader and tools written in Rust. It is still in development, lack some features, but it can view most PDF files without problem.

Workspace structure

• nipdf: The core library.
• nipdf-macro: The macro library for nipdf library.
• nipdf-render: Render library using tiny-skia library.
• nipdf-dump: The command line interface tool to extract, dump and convert PDF file to png image.
• nipdf-reader: The GUI viewer using iced gui library.
• nipdf-viewer: The GUI viewer using gtk gui library.
• prescript: Postscript virtual machine, to handle postscript function, type1 font, cmap, etc.
• cff-parser: CFF font parser.

Start

Run cargo run -p nipdf-reader -- path-of-pdf-file

Screenshot

TODO

• PDF 2.0 support
• Annotation render
• Interactive Form
• Wasm
• Pure Rust
• Shadings
  • Radius shading with two circles
  • Free-form Gouraud-shaded triangle meshes (Type 4)
  • Lattice-form Gouraud-shaded triangle meshes (Type 5)
  • Coons patch meshes (Type 6)
  • Tensor-product patch meshes (Type 7)
• Stable core API

Pure Rust

Fowling C/C++ lib used because of no equivalent rust crates or has missing some feature or bug.

1. zlib, rust version failed handle some deflate cases
2. freetype, ttf-parser can not render type1 font, and failed render some cjk glyphs

lib.rs:

Decode Adobe CFF font files.

The entry type is File, use File::open() method to parses a CFF file and returns File

File is a struct that contains all the data in a CFF file. derived types borrows data hold by File.

File::fonts() returns a iterator of Font which is a struct that provides info for that font, such as encoding, charset, etc.