3 releases
0.1.2 | Aug 27, 2020 |
---|---|
0.1.1 | Aug 26, 2020 |
0.1.0 | Aug 23, 2020 |
#446 in Images
115KB
3K
SLoC
DevPNG
Note
For the moment, this crate is in construction.
If you need something, you can tell me:
- Rust Programming Language Community discord: @Engineer#7038
- mail: pascal.chen@devling.xyz
If you encounter some issues, tell me.
Examples
Want to modify an image ?
use devpng::prelude::PNG;
fn main() -> Result<(), String> {
// Load.
let mut buf = std::fs::read("img.png")
.expect("Couldn't read the file.");
let mut png = PNG::load(&mut buf)?;
// Access image.
let img = png.image();
// Modify image.
for x in img.iter_mut() {
*x = !*x;
}
// Store.
png.store("img.png")?;
Ok(())
}
Want to create an image ?
use devpng::prelude::{ColourType, Image, PNG, Point};
fn main() -> Result<(), String> {
let mut data = vec![255; 800 * 200];
let img = Image::new(&mut data[..])
.set_ncol(800) // 200
.set_nrow(200)
.set_depth(8)
.set_colour(ColourType::RGBA);
let mut buf = Vec::new();
let mut png = PNG::from_image(&mut buf, &img);
let mut img = png.image();
for i in 0..50 {
let center = Point { x: 100, y: 100 };
let radius = 80 - i as i32;
let colour = &[0, (255 - i * 5) as u8, (255 - i * 5) as u8, 255];
img.plot_circle(center, radius, colour);
}
// Store.
png.store("img.png")?;
Ok(())
}
Want low level access ?
use devpng::prelude::DataStreamMut;
fn main() -> Result<(), String> {
// Load.
let mut buf = std::fs::read("img.png")
.expect("Couldn't read the file.");
let mut datastream = DataStreamMut::from(&mut buf)?;
// Access image.
let mut cache = datastream.idat()?;
let img = cache.image();
// Modify image.
for x in img.iter_mut() {
*x = !*x;
}
// Store.
let png = datastream.rebuild(&mut Some(&mut cache));
std::fs::write("img.png", png)
.expect("Couldn't write the file.");
Ok(())
}
Images
Documentation
Installation
Add following lines to your Cargo.toml
:
[dependencies]
devpng = "0"
References
- DEFLATE: RFC-1951
- PNG: RFC-2083
- W3C: https://www.w3.org/TR/PNG/