io.rong.imkit.picture.widget.longimage

Class SkiaImageRegionDecoder

java.lang.Object

io.rong.imkit.picture.widget.longimage.SkiaImageRegionDecoder

All Implemented Interfaces:

ImageRegionDecoder

public class SkiaImageRegionDecoder
extends java.lang.Object
implements ImageRegionDecoder

Default implementation of com.davemorrissey.labs.subscaleview.decoder.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.

Constructor Summary

Constructors

Constructor and Description
SkiaImageRegionDecoder()

Method Summary

Modifier and Type	Method and Description
android.graphics.Bitmap	decodeRegion(android.graphics.Rect sRect, int sampleSize) Decode a region of the image with the given sample size.
android.graphics.Point	init(android.content.Context context, android.net.Uri uri) Initialise the decoder.
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

public SkiaImageRegionDecoder()

Method Detail

init

public android.graphics.Point init(android.content.Context context,
                                   android.net.Uri uri)
                            throws java.lang.Exception

Description copied from interface: ImageRegionDecoder

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

Specified by:

init in interface ImageRegionDecoder

Parameters:

context - Application context. A reference may be held, but must be cleared on recycle.

uri - URI of the image.

Returns:

Dimensions of the image.

Throws:

java.lang.Exception - if initialisation fails.

decodeRegion

public android.graphics.Bitmap decodeRegion(android.graphics.Rect sRect,
                                            int sampleSize)

Description copied from interface: ImageRegionDecoder

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 AsyncTask 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.

Specified by:

decodeRegion in interface ImageRegionDecoder

Parameters:

sRect - Source image rectangle to decode.

sampleSize - Sample size.

Returns:

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

isReady

public boolean isReady()

Description copied from interface: ImageRegionDecoder

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

Specified by:

isReady in interface ImageRegionDecoder

Returns:

true if the decoder is ready to be used.

recycle

public void recycle()

Description copied from interface: ImageRegionDecoder

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

Specified by:

recycle in interface ImageRegionDecoder