89 lines
2.8 KiB
Java
89 lines
2.8 KiB
Java
/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.googlecode.leptonica.android;
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import android.graphics.Bitmap;
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import android.graphics.Bitmap.CompressFormat;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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/**
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* JPEG input and output methods.
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*
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* @author alanv@google.com (Alan Viverette)
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*/
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public class JpegIO {
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static {
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System.loadLibrary("lept");
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}
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/** Default quality is 85%, which is reasonably good. */
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public static final int DEFAULT_QUALITY = 85;
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/** Progressive encoding is disabled by default to increase compatibility. */
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public static final boolean DEFAULT_PROGRESSIVE = false;
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/**
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* Returns a compressed JPEG byte representation of this Pix using default
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* parameters.
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*
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* @param pixs
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* @return a compressed JPEG byte array representation of the Pix
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*/
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public static byte[] compressToJpeg(Pix pixs) {
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return compressToJpeg(pixs, DEFAULT_QUALITY, DEFAULT_PROGRESSIVE);
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}
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/**
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* Returns a compressed JPEG byte representation of this Pix.
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*
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* @param pixs A source pix image.
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* @param quality The quality of the compressed image. Valid range is 0-100.
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* @param progressive Whether to use progressive compression.
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* @return a compressed JPEG byte array representation of the Pix
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*/
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public static byte[] compressToJpeg(Pix pixs, int quality, boolean progressive) {
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if (pixs == null)
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throw new IllegalArgumentException("Source pix must be non-null");
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if (quality < 0 || quality > 100)
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throw new IllegalArgumentException("Quality must be between 0 and 100 (inclusive)");
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final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
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final Bitmap bmp = WriteFile.writeBitmap(pixs);
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bmp.compress(CompressFormat.JPEG, quality, byteStream);
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bmp.recycle();
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final byte[] encodedData = byteStream.toByteArray();
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try {
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byteStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return encodedData;
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}
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// ***************
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// * NATIVE CODE *
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// ***************
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private static native byte[] nativeCompressToJpeg(
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long nativePix, int quality, boolean progressive);
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}
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