/DevKit.Xamarin.ImageKit

ImageKit is a library to convert and resize images in Xamarin

Primary LanguageC#

DevKit.Xamarin.ImageKit

The ImageKit for Xamarin contains basic functionality to rezize images and convert images betwen JPG and PNG formats in Xamarin.Android, Xamarin.iOS, UWP and Xamarin.Forms.

Usage

  • Xamarin.Forms Portable Class Library:

    • Add DevKit.Xamarin.ImageKit.Abstractions
    • Add DevKit.Xamarin.ImageKit (from libs/DevKit.Xamarin.ImageKit Folder)

  • Droid Project:

    • Add DevKit.Xamarin.ImageKit.Abstractions
    • Add DevKit.Xamarin.ImageKit (from libs/DevKit.Xamarin.ImageKit.Droid Folder)

  • iOS Project:

    • Add DevKit.Xamarin.ImageKit.Abstractions
    • Add DevKit.Xamarin.ImageKit (from libs/DevKit.Xamarin.ImageKit.iOS Folder)

  • UWP Project:

    • Add DevKit.Xamarin.ImageKit.Abstractions
    • Add DevKit.Xamarin.ImageKit (from libs/DevKit.Xamarin.ImageKit.UWP Folder)

Functions

  • Conversion
//Convert Image from JPG to PNG
byte[] pngImage = await CrossImageConverter.Current.ConvertJpgToPng(sampleImage);

//Convert Image from PNG to JPG. It can receive the quality of the result image from 0 to 100
byte[] newJpg = await CrossImageConverter.Current.ConvertPngToJpgAsync(png, 100);
  • Resizing
//Convert Image from PNG to JPG. It can receive the quality of the result image from 0 to 100
byte[] newJpg = await CrossImageConverter.Current.ConvertPngToJpgAsync(png, 100);

//Reduce de quelity of JP Image. Quality is a value from 0 to 100
byte[] lessQualityImage = await CrossImageResizer.Current.ReduceJPGQualityAsync(sampleImage, 50);

//Resize an image with custom width and height
byte[] reducedImage = await CrossImageResizer.Current.ResizeImageAsync(sampleImage, 320, 320, format);

//Resize an image base on a percentage from the original image
byte[] scaledImage = await CrossImageResizer.Current.ScaleImageAsync(sampleImage, 50, format);

Extension methods for platforms

I created some extension methods to facilitate conversion from image native classes to byte[] and vice versa.

These are the method(s) per platform in DevKit.Xamarin.ImageKit dll

  • Droid (namespace DevKit.Xamarin.ImageKit.Droid.Utils)
    • ToBitmap() returns a Bitmap from byte[]
    • ToByteArrayAsync(Abstractions.ImageFormat, int quality) returns a byte[] from a Bitmap instace
  • iOS (namespace DevKit.Xamarin.ImageKit.iOS.Utils)
    • ToImageAsync() returns a UIImage from byte[]
  • UWP (namespace DevKit.Xamarin.ImageKit.UWP.Utils)
    • ToBitmapImageAsync() returns a WriteableBitmap from byte[]
    • ToByteArrayAsync(Abstractions.ImageFormat, int quality) returns a byte[] from a WriteableBitmap instace

Feel free to contribute, improve or use this code for your projects.