usage

```rust use micropng::{readpng, write_apng, Image, ImageData};

fn main() { // load an image let image = readpng(&"test.png".tostring()).expect("can't load test.png");

println!("{} x {}", image.width(), image.height());

let data = image.data();

(0 .. image.height()).for_each(|y| {
  (0 .. image.width()).for_each(|x| {
    let pixel = data[y][x]; // (R, G, B, A) as (u16, u16, u16, u16)
  });
});

// now write it back as one-frame image

write_apng(&"back.png".to_string(),
    &ImageData::RGBA16(vec![data]),
    None ,// automatically select filtering
    None, // no progress callback
    false // no Adam-7
).expect("can't save back.png");

} ```

supported formats

| enum variant | | |-------------------|-------------------------------------| | ImageData::RGB | 8-bit RGB without alpha | | ImageData::RGBA | 8-bit RGB with alpha | | ImageData::RGB16 | 16-bit plain RGB without alpha | | ImageData::RGBA16 | 16-bit RGB with alpha | | ImageData::NDX | 8-bit indexed palette without alpha | | ImageData::NDXA | 8-bit indexed palette with alpha |

todo