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package com.davemorrissey.labs.subscaleview.decoder;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.graphics.Rect;
import android.net.Uri;
/**
* Interface for image decoding classes, allowing the default {@link android.graphics.BitmapRegionDecoder}
* based on the Skia library to be replaced with a custom class.
*/
public interface ImageRegionDecoder {
/**
* Initialise the decoder. When possible, perform initial setup work once in this method. The
* dimensions of the image must be returned. The URI can be in one of the following formats:
* <br>
* File: <code>file:///scard/picture.jpg</code>
* <br>
* Asset: <code>file:///android_asset/picture.png</code>
* <br>
* Resource: <code>android.resource://com.example.app/drawable/picture</code>
* @param context Application context. A reference may be held, but must be cleared on recycle.
* @param uri URI of the image.
* @return Dimensions of the image.
* @throws Exception if initialisation fails.
*/
Point init(Context context, Uri uri) throws Exception;
/**
* <p>
* 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
* {@link android.os.AsyncTask}s running in an executor that may have multiple threads, so
* implementations must be thread safe. Adding <code>synchronized</code> to the method signature
* is the simplest way to achieve this, but bear in mind the {@link #recycle()} method can be
* called concurrently.
* </p><p>
* See {@link SkiaImageRegionDecoder} and {@link SkiaPooledImageRegionDecoder} for examples of
* internal locking and synchronization.
* </p>
* @param sRect Source image rectangle to decode.
* @param sampleSize Sample size.
* @return The decoded region. It is safe to return null if decoding fails.
*/
Bitmap decodeRegion(Rect sRect, int sampleSize);
/**
* Status check. Should return false before initialisation and after recycle.
* @return true if the decoder is ready to be used.
*/
boolean isReady();
/**
* This method will be called when the decoder is no longer required. It should clean up any resources still in use.
*/
void recycle();
}
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