pngss: A subset implementation of PNG Encoder and Decoder

Features

• Pure Rust Implementation
• Support for no_std
• It generally provides sufficient functionality for most applications, but some features are not supported. See section below.
• The default deflate library uses our implementation. We are constantly improving it, but if you are not satisfied with its performance, you can implement a custom class to replace it with another implementation. See also DeflateDecoder or DeflateEncoder.
• The detailed specifications are subject to change as it is still under development.

MSRV

• Undetermined, The latest version is recommended whenever possible.

Supported features

feature	supported
IHDR chunk	✅
PLTE chunk	✅
IDAT chunk	✅
IEND chunk	✅
other chunks	ignored
8bit depth color	✅
16bit depth color	NOT SUPPORTED
Interlace	NOT SUPPORTED
Color adjustment	ignored
CRC validation	ignored
checksum	ignored

Example Apps

/examples/viewer: Image Viewer

• An example application to display PNG files using embedded-graphics

$ cargo run -p viewer FILE_NAME

/examples/idatdump: IDAT dumper

• An example application showing the contents of IDAT chunks

$ cargo run -p idatdump -- [MODE] [OPTIONS] [--] FILE_NAME

Modes:

• -raw Decompress IDAT chunks and dump them as is (default)
• -filter Decompress IDAT chunks to show only filter types
• -decoded Dumps the final decoding results of the image data

Options:

• -hex Show in hex (default)
• -bin Show in binary
• -b64 Show in base64

References

• Portable Network Graphics (PNG) Specification

LICENSE

MIT License

(c) nerry