PNG encoder and decoder
This crate contains a PNG decoder. It supports reading of single lines or whole frames.
The decoder
The most important types for decoding purposes are Decoder
and
Reader
. They both wrap a std::io::Read
.
Decoder
serves as a builder for Reader
. Calling Decoder::read_info
reads from the Read
until the
image data is reached.
Using the decoder
use std::fs::File;
// The decoder is a build for reader and can be used to set various decoding options
// via `Transformations`. The default output transformation is `TRANSFORM_EXPAND
// | TRANSFORM_STRIP_ALPHA`.
let decoder = png::Decoder::new(File::open("tests/pngsuite/basi0g01.png").unwrap());
let (info, mut reader) = decoder.read_info().unwrap();
// Allocate the output buffer.
let mut buf = vec![0; info.buffer_size()];
// Read the next frame. Currently this function should only called once.
// The default options
reader.next_frame(&mut buf).unwrap();
Encoder
Not available yet