10 releases
0.2.0-alpha.3 | Aug 22, 2024 |
---|---|
0.2.0-alpha.2 | Aug 28, 2021 |
0.2.0-alpha.1 | Jun 24, 2021 |
0.1.0 | Mar 14, 2021 |
0.1.0-alpha.3 | Mar 14, 2020 |
#131 in Images
589 downloads per month
Used in zune-png
380KB
10K
SLoC
spng-rs
Rust bindings to libspng.
Version
spng-rs | libspng |
---|---|
Unreleased | 0.7.4 |
0.2.0-alpha.2 |
0.7.0-rc2 |
0.2.0-alpha.1 |
0.7.0-rc2 |
0.1.0 |
0.6.3 |
Performance
This test image is decoded ~ 3-5x faster than with the png crate.
png_decode time: [1.7354 ms 1.7372 ms 1.7392 ms]
spng_decode time: [569.27 µs 570.86 µs 572.45 µs]
spng_decode time: [311.84 µs 312.45 µs 313.13 µs] (--features=zlib-ng)
Examples
A one-liner for simple use cases:
let file = File::open("image.png")?;
let (out_info, data) = spng::decode(file, spng::Format::Rgba8)?;
assert_eq!(300, out_info.width);
assert_eq!(300, out_info.height);
assert_eq!(8, out_info.bit_depth);
assert_eq!(4, out_info.color_type.samples());
assert_eq!(out_info.buffer_size, output_buffer_size);
The Decoder
interface is modeled after the png crate:
let file = File::open("image.png")?;
let decoder = spng::Decoder::new(file)
.with_output_format(spng::Format::Rgba8);
let (out_info, mut reader) = decoder.read_info()?;
let out_buffer_size = reader.output_buffer_size();
let mut data = vec![0; out_buffer_size];
reader.next_frame(&mut data)?;
assert_eq!(300, out_info.width);
assert_eq!(300, out_info.height);
assert_eq!(8, out_info.bit_depth);
assert_eq!(4, out_info.color_type.samples());
assert_eq!(out_info.buffer_size, out_buffer_size);
The RawContext
interface is a safe and minimal wrapper over the full libspng C
API.
let file = File::open("image.png")?;
let out_format = spng::Format::Rgba8;
let mut ctx = spng::raw::RawContext::new()?;
ctx.set_png_stream(file)?;
let ihdr = ctx.get_ihdr()?;
let out_buffer_size = ctx.decoded_image_size(out_format)?;
let mut data = vec![0; out_buffer_size];
ctx.decode_image(&mut data, out_format, spng::DecodeFlags::empty())?;
assert_eq!(300, ihdr.width);
assert_eq!(300, ihdr.height);
assert_eq!(8, ihdr.bit_depth);
assert_eq!(4, spng::ColorType::try_from(ihdr.color_type)?.samples());
Dependencies
~0.9–1.2MB
~24K SLoC