Android Open Source - subsampling-scale-image-view Skia Image Decoder

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From Project

Back to project page subsampling-scale-image-view.

License

The source code is released under:

Apache License

Java Source Code

package com.davemorrissey.labs.subscaleview.decoder;
/*ww w  . j  a v a2 s  . c  om*/
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.text.TextUtils;

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 + "://";

    @Override
    public Bitmap decode(Context context, Uri uri) throws Exception {
        String uriString = uri.toString();
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.RGB_565;
        options.inDither = true;
        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) {
                }
            }

            return BitmapFactory.decodeResource(context.getResources(), id, options);
        } else if (uriString.startsWith(ASSET_PREFIX)) {
            String assetName = uriString.substring(ASSET_PREFIX.length());
            return BitmapFactory.decodeStream(context.getAssets().open(assetName), null, options);
        } else if (uriString.startsWith(FILE_PREFIX)) {
            return BitmapFactory.decodeFile(uriString.substring(FILE_PREFIX.length()), options);
        } else {
            ContentResolver contentResolver = context.getContentResolver();
            return BitmapFactory.decodeStream(contentResolver.openInputStream(uri), null, options);
        }
    }
}

Java Source Code List

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