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package com.davemorrissey.labs.subscaleview.decoder;
import android.content.ContentResolver;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.support.annotation.Keep;
import android.text.TextUtils;
import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView;
import java.io.InputStream;
import java.util.List;
/**
* Default implementation of {@link com.davemorrissey.labs.subscaleview.decoder.ImageDecoder}
* using Android's {@link android.graphics.BitmapFactory}, based on the Skia library. This
* works well in most circumstances and has reasonable performance, however it has some problems
* with grayscale, indexed and CMYK images.
*/
public class SkiaImageDecoder implements ImageDecoder {
private static final String FILE_PREFIX = "file://";
private static final String ASSET_PREFIX = FILE_PREFIX + "/android_asset/";
private static final String RESOURCE_PREFIX = ContentResolver.SCHEME_ANDROID_RESOURCE + "://";
private final Bitmap.Config bitmapConfig;
@Keep
@SuppressWarnings("unused")
public SkiaImageDecoder() {
this(null);
}
@SuppressWarnings({"WeakerAccess", "SameParameterValue"})
public SkiaImageDecoder(Bitmap.Config bitmapConfig) {
Bitmap.Config globalBitmapConfig = SubsamplingScaleImageView.getPreferredBitmapConfig();
if (bitmapConfig != null) {
this.bitmapConfig = bitmapConfig;
} else if (globalBitmapConfig != null) {
this.bitmapConfig = globalBitmapConfig;
} else {
this.bitmapConfig = Bitmap.Config.RGB_565;
}
}
@Override
public Bitmap decode(Context context, Uri uri) throws Exception {
String uriString = uri.toString();
BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bitmap;
options.inPreferredConfig = bitmapConfig;
if (uriString.startsWith(RESOURCE_PREFIX)) {
Resources res;
String packageName = uri.getAuthority();
if (context.getPackageName().equals(packageName)) {
res = context.getResources();
} else {
PackageManager pm = context.getPackageManager();
res = pm.getResourcesForApplication(packageName);
}
int id = 0;
List<String> segments = uri.getPathSegments();
int size = segments.size();
if (size == 2 && segments.get(0).equals("drawable")) {
String resName = segments.get(1);
id = res.getIdentifier(resName, "drawable", packageName);
} else if (size == 1 && TextUtils.isDigitsOnly(segments.get(0))) {
try {
id = Integer.parseInt(segments.get(0));
} catch (NumberFormatException ignored) {
}
}
bitmap = BitmapFactory.decodeResource(context.getResources(), id, options);
} else if (uriString.startsWith(ASSET_PREFIX)) {
String assetName = uriString.substring(ASSET_PREFIX.length());
bitmap = BitmapFactory.decodeStream(context.getAssets().open(assetName), null, options);
} else if (uriString.startsWith(FILE_PREFIX)) {
bitmap = BitmapFactory.decodeFile(uriString.substring(FILE_PREFIX.length()), options);
} else {
InputStream inputStream = null;
try {
ContentResolver contentResolver = context.getContentResolver();
inputStream = contentResolver.openInputStream(uri);
bitmap = BitmapFactory.decodeStream(inputStream, null, options);
} finally {
if (inputStream != null) {
try { inputStream.close(); } catch (Exception e) { /* Ignore */ }
}
}
}
if (bitmap == null) {
throw new RuntimeException("Skia image region decoder returned null bitmap - image format may not be supported");
}
return bitmap;
}
}
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