How to use open_image_from_bytes?

[xanderjakeq]

I have ImageData from the arboard crate to get an image from the clipboard. I want to do something with that image with photon and save it.

I'm trying to use it like this:

open_image_from_bytes(&img_data.to_owned_img().bytes).unwrap()

But I get this error:

OpenError(Unsupported(UnsupportedError { format: Unknown, kind: Format(Unknown) }))

Not sure what I'm doing wrong..

[yosefahab]

getting the same error when dealing with Video from ffmeg_the_third and Frame from the ffmpeg_frame_grabber
which is probably because ffmpeg returns raw rgb images (no format header), DynamicImage has a method to convert raw images to a specific format,

let mut png_buffer = Vec::new();
image.write_to(&mut Cursor::new(&mut png_buffer), image::ImageOutputFormat::Png,).unwrap();

however it does not seem to work with photon

[nathanbabcock]

@xanderjakeq @yosefahab I wrote this function to do something very similar. Maybe it will help you. The trick is to use the PhotonImage::new() constructor with the raw pixels.

/// Convert an `RgbImage` (`image` crate) to a `PhotonImage` (`photon-rs` crate)
pub fn rgb_to_photon(rgb: &RgbImage) -> PhotonImage {
    let rgb24 = rgb.to_vec();
    let rgb32 = rgb24_to_rgba32(rgb24);

    PhotonImage::new(rgb32, rgb.width(), rgb.height())
}

[yosefahab]

I'm not sure where you got rgb24_to_rgb32() but this adds too much overhead (bytes -> image -> rgb -> rgb -> photon), it would be much better if we figure out why its not working.