Package ai.nexconn.chatui.picture.widget.longimage

Class SkiaImageRegionDecoder

  • All Implemented Interfaces:
    ai.nexconn.chatui.picture.widget.longimage.ImageRegionDecoder 
    
public class SkiaImageRegionDecoder
 implements ImageRegionDecoder

    Default implementation of ImageRegionDecoder using Android's BitmapRegionDecoder, based on the Skia library. This works well in most circumstances and has reasonable performance due to the cached decoder instance, however it has some problems with grayscale, indexed and CMYK images.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      Point init(Context context, Uri uri) Initialise the decoder.
      Bitmap decodeRegion(Rect sRect, int sampleSize) Decode a region of the image with the given sample size.
      boolean isReady() Status check.
      void recycle() This method will be called when the decoder is no longer required.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • SkiaImageRegionDecoder

        SkiaImageRegionDecoder()

    • Method Detail

      • init

         Point init(Context context, Uri uri)

        Initialise the decoder. When possible, initial setup work once in this method. This method must return the dimensions of the image. The URI can be in one of the following formats: File: file:///scard/picture.jpg Asset: file:///android_asset/picture.png Resource: android.resource://com.example.app/drawable/picture

        Parameters:
        context - Application context.
        uri - URI of the image.
        Returns:

        Dimensions of the image.

      • decodeRegion

         Bitmap decodeRegion(Rect sRect, int sampleSize)

        Decode a region of the image with the given sample size. This method is called off the UI thread so it can safely load the image on the current thread. It is called from an running in a single threaded executor, and while a synchronization lock is held on this object, so will never be called concurrently even if the decoder implementation supports it.

        Parameters:
        sRect - Source image rectangle to decode.
        sampleSize - Sample size.
        Returns:

        The decoded region. It is safe to return null if decoding fails.

      • isReady

         boolean isReady()

        Status check. Should return false before initialisation and after recycle.

        Returns:

        true if the decoder is ready to be used.

      • recycle

         void recycle()

        This method will be called when the decoder is no longer required. It should clean up any resources still in use.