The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/mobile/android/base/favicons/decoders/LoadFaviconResult.java	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,76 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +package org.mozilla.gecko.favicons.decoders;
     1.9 +
    1.10 +import android.graphics.Bitmap;
    1.11 +import android.util.Log;
    1.12 +
    1.13 +import java.io.ByteArrayOutputStream;
    1.14 +import java.util.Iterator;
    1.15 +
    1.16 +/**
    1.17 + * Class representing the result of loading a favicon.
    1.18 + * This operation will produce either a collection of favicons, a single favicon, or no favicon.
    1.19 + * It is necessary to model single favicons differently to a collection of one favicon (An entity
    1.20 + * that may not exist with this scheme) since the in-database representation of these things differ.
    1.21 + * (In particular, collections of favicons are stored in encoded ICO format, whereas single icons are
    1.22 + * stored as decoded bitmap blobs.)
    1.23 + */
    1.24 +public class LoadFaviconResult {
    1.25 +    private static final String LOGTAG = "LoadFaviconResult";
    1.26 +
    1.27 +    byte[] faviconBytes;
    1.28 +    int offset;
    1.29 +    int length;
    1.30 +
    1.31 +    boolean isICO;
    1.32 +    Iterator<Bitmap> bitmapsDecoded;
    1.33 +
    1.34 +    public Iterator<Bitmap> getBitmaps() {
    1.35 +        return bitmapsDecoded;
    1.36 +    }
    1.37 +
    1.38 +    /**
    1.39 +     * Return a representation of this result suitable for storing in the database.
    1.40 +     *
    1.41 +     * @return A byte array containing the bytes from which this result was decoded,
    1.42 +     *         or null if re-encoding failed.
    1.43 +     */
    1.44 +    public byte[] getBytesForDatabaseStorage() {
    1.45 +        // Begin by normalising the buffer.
    1.46 +        if (offset != 0 || length != faviconBytes.length) {
    1.47 +            final byte[] normalised = new byte[length];
    1.48 +            System.arraycopy(faviconBytes, offset, normalised, 0, length);
    1.49 +            offset = 0;
    1.50 +            faviconBytes = normalised;
    1.51 +        }
    1.52 +
    1.53 +        // For results containing multiple images, we store the result verbatim. (But cutting the
    1.54 +        // buffer to size first).
    1.55 +        // We may instead want to consider re-encoding the entire ICO as a collection of efficiently
    1.56 +        // encoded PNGs. This may not be worth the CPU time (Indeed, the encoding of single-image
    1.57 +        // favicons may also not be worth the time/space tradeoff.).
    1.58 +        if (isICO) {
    1.59 +            return faviconBytes;
    1.60 +        }
    1.61 +
    1.62 +        // For results containing a single image, we re-encode the
    1.63 +        // result as a PNG in an effort to save space.
    1.64 +        final Bitmap favicon = ((FaviconDecoder.SingleBitmapIterator) bitmapsDecoded).peek();
    1.65 +        final ByteArrayOutputStream stream = new ByteArrayOutputStream();
    1.66 +
    1.67 +        try {
    1.68 +            if (favicon.compress(Bitmap.CompressFormat.PNG, 100, stream)) {
    1.69 +                return stream.toByteArray();
    1.70 +            }
    1.71 +        } catch (OutOfMemoryError e) {
    1.72 +            Log.w(LOGTAG, "Out of memory re-compressing favicon.");
    1.73 +        }
    1.74 +
    1.75 +        Log.w(LOGTAG, "Favicon re-compression failed.");
    1.76 +        return null;
    1.77 +    }
    1.78 +
    1.79 +}