arthurmarcels / DevKit.Xamarin.ImageKit

ImageKit is a library to convert and resize images in Xamarin

DevKit.Xamarin.ImageKit

The ImageKit for Xamarin contains basic functionality to resize 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.