Archiving this repository

This has been something that I was keep pushing away from me. One of my more successful projects. But the issues are piling up, the pull requests don't get reviewed, and the truth is that I don't have the time and heart for this project anymore. Flutter was new back then. I had a really cool project with some friends, but in the end, the project didn't make it, and we never needed this library further developed.

So today I decided that I will make this repository an archive and set it to read-only.

If you're willing to take ownership over this repository, feel free to contact me.

flutter_native_image

Native Flutter Image tools

This plugin aims to have native tools to resize images and reduce their quality by compression. The code is somewhat hacky (especially the iOS part), but it works for my needs and hasn't crashed on me. Feel free to improve it if you want to.

Right now there are a few functions. Please find some examples below.

Usage

Install

Add the following lines to your pubspec.yaml under dependencies

flutter_native_image: ^0.0.6

Compress an image

File compressedFile = await FlutterNativeImage.compressImage(file.path,
    quality: quality, percentage: percentage);

You have to give it a file from the file system and optionally provide a quality (1-100) and a resizing percentage (1-100). Each platform will use it's proper tools to handle the resizing.

To resize the image to the certain size, use following code:

ImageProperties properties = await FlutterNativeImage.getImageProperties(file.path);
File compressedFile = await FlutterNativeImage.compressImage(file.path, quality: 80, 
    targetWidth: 600, targetHeight: 300);

Keep aspect ratio of the file:

ImageProperties properties = await FlutterNativeImage.getImageProperties(file.path);
File compressedFile = await FlutterNativeImage.compressImage(file.path, quality: 80, 
    targetWidth: 600, 
    targetHeight: (properties.height * 600 / properties.width).round());

Get image properties

ImageProperties properties = await FlutterNativeImage.getImageProperties(file.path);

It returns an ImageProperties object containing the width and the height of the image.

Crop an image

File croppedFile = await FlutterNativeImage.cropImage(file.path, originX, originY, width, height);

Returns a file containing the image cropped with the given dimensions.

Contributions

Alexis Leblond (a-leblond) the image properties feature.

Eugene Strokin the resize to target height/width feature

Dae Won Kim null-safety feature

Credits

Shoutouts to Trevor from Vocaro.com. He had the fitting algorithm for resizing images in Objective-C.

Source: http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/

For preserving exif information, I took the code from googles image_picker github (https://github.com/flutter/plugins/tree/master/packages/image_picker)