I'm using the image
( Link to repo ) crate in Rust, to encode a GIF image into a PNG with the following code:
fn encode_png(&self, img: &DynamicImage) -> Result<(), Error> {
let file = File::create("icon.png").unwrap();
let ref mut buff = BufWriter::new(file);
let encoder = PNGEncoder::new(buff);
match encoder.encode(&img.to_bytes(), 256, 256, img.color()) {
Ok(_) => Ok(()),
Err(err) => Err(Error::new(err.description()))
}
}
The img
variable represents a DynamicImage
which I opened using the open
method from the same crate.
What happens is, that the programs runs successfuly but the output file is broken. I wrote the code based on the following docs: PNGEncoder | encode
Thanks in advance!
The issue with my code above is that I'm giving the wrong image dimensions to the encoder as parameters (256, 256).
I expected the image to be resized to 256x256 but the encoder expects the current image dimensions in order to work as expected.
The following code is running as expected:
fn encode_png(&self, img: &DynamicImage) -> Result<(), Error> {
let file = File::create("icon.png").unwrap();
let ref mut buff = BufWriter::new(file);
let encoder = PNGEncoder::new(buff);
match encoder.encode(&img.to_bytes(), img.dimensions().0, img.dimensions().1, img.color()) {
Ok(_) => Ok(()),
Err(err) => Err(Error::new(err.description()))
}
}
Thanks to Solomon Ucko for pointing it out in the comments!
As I needed to resize the image and then encode it to a PNG file, I ended up with the following:
fn encode_png(&self, img: &DynamicImage) -> Result<(), Error> {
if img.dimensions().0 != 256 {
let resized = img.resize_exact(256, 256, FilterType::Gaussian);
return self.encode_png(&resized);
}
let file = File::create("icon.png").unwrap();
let ref mut buff = BufWriter::new(file);
let encoder = PNGEncoder::new(buff);
match encoder.encode(&img.to_bytes(), img.dimensions().0, img.dimensions().1, img.color()) {
Ok(_) => Ok(()),
Err(err) => Err(Error::new(err.description()))
}
}
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