package com.luck.picture.lib.widget.longimage;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Point;
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import android.graphics.Rect;
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import android.net.Uri;
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/**
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* Interface for image decoding classes, allowing the default {@link android.graphics.BitmapRegionDecoder}
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* based on the Skia library to be replaced with a custom class.
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*/
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public interface ImageRegionDecoder {
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/**
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* Initialise the decoder. When possible, initial setup work once in this method. This method
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* must return the dimensions of the image. The URI can be in one of the following formats:
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* File: file:///scard/picture.jpg
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* Asset: file:///android_asset/picture.png
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* Resource: android.resource://com.example.app/drawable/picture
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* @param context Application context. A reference may be held, but must be cleared on recycle.
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* @param uri URI of the image.
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* @return Dimensions of the image.
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* @throws Exception if initialisation fails.
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*/
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Point init(Context context, Uri uri) throws Exception;
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/**
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* Decode a region of the image with the given sample size. This method is called off the UI thread so it can safely
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* load the image on the current thread. It is called from an {@link android.os.AsyncTask} running in a single
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* threaded executor, and while a synchronization lock is held on this object, so will never be called concurrently
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* even if the decoder implementation supports it.
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* @param sRect Source image rectangle to decode.
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* @param sampleSize Sample size.
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* @return The decoded region. It is safe to return null if decoding fails.
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*/
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Bitmap decodeRegion(Rect sRect, int sampleSize);
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/**
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* Status check. Should return false before initialisation and after recycle.
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* @return true if the decoder is ready to be used.
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*/
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boolean isReady();
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/**
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* This method will be called when the decoder is no longer required. It should clean up any resources still in use.
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*/
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void recycle();
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}
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