Acme.JPM.Encoders.JpegEncoder Maven / Gradle / Ivy
// JpegEncoder - write out an image as a JPEG
//
// Copyright (C) 1996 by Jef Poskanzer . All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/
package Acme.JPM.Encoders;
import java.awt.*;
import java.awt.image.ImageProducer;
import java.io.IOException;
import java.io.OutputStream;
/// Write out an image as a JPEG.
// DOESN'T WORK YET.
//
// Fetch the software.
// Fetch the entire Acme package.
//
// @see ToJpeg
public class JpegEncoder extends ImageEncoder {
/// Constructor.
// @param img The image to encode.
// @param out The stream to write the JPEG to.
public JpegEncoder(Image img, OutputStream out) throws IOException {
super(img, out);
}
/// Constructor.
// @param prod The ImageProducer to encode.
// @param out The stream to write the JPEG to.
public JpegEncoder(ImageProducer prod, OutputStream out) throws IOException {
super(prod, out);
}
int qfactor = 100;
/// Set the Q-factor.
public void setQfactor(int qfactor) {
this.qfactor = qfactor;
}
int width, height;
int[][] rgbPixels;
@Override
void encodeStart(int width, int height) {
this.width = width;
this.height = height;
rgbPixels = new int[height][width];
}
@Override
void encodePixels(int x, int y, int w, int h, int[] rgbPixels, int off, int scansize) {
// Save the pixels.
for (int row = 0; row < h; ++row)
System.arraycopy(rgbPixels, row * scansize + off,
this.rgbPixels[y + row], x, w);
}
@Override
void encodeDone() throws IOException {
writeJfifHuffHeader();
// !!!
}
// Some of the following code is derived from the Berkeley Continuous
// Media Toolkit (http://bmrc.berkeley.edu/projects/cmt/), which is
// Copyright (c) 1996 The Regents of the University of California.
// All rights reserved.
//
// IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
// DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
// OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE
// UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//
// THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
// This array represents the default JFIF header for quality = 100 and
// size = 640x480, with Huffman tables. The values are adjusted when a
// file is generated.
private static byte[] jfifHuff100Header = {
// SOI
(byte) 0xFF, (byte) 0xD8,
// JFIF header
(byte) 0xFF, (byte) 0xE0, // Marker
(byte) 0x00, (byte) 0x10, // Length = 16 bytes
(byte) 0x4A, (byte) 0x46, (byte) 0x49, (byte) 0x46, // "JFIF"
(byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x00, (byte) 0x00,
(byte) 0x01, (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00,
// Start of frame (section B.2.2)
(byte) 0xFF, (byte) 0xC0, // Baseline DCT
(byte) 0x00, (byte) 0x11, // Length = 17 bytes
(byte) 0x08, // Sample precision
(byte) 0x01, (byte) 0xE0, // Height
(byte) 0x02, (byte) 0x80, // Width
(byte) 0x03, // Number of components = 3
// Scan 1: 2:1 horiz, (byte) 1:1 vertical, (byte) use QT 0
(byte) 0x01, (byte) 0x21, (byte) 0x00,
// Scan 2: 1:1 horiz, (byte) 1:1 vertical, (byte) use QT 1
(byte) 0x02, (byte) 0x11, (byte) 0x01,
// Scan 3: 1:1 horiz, (byte) 1:1 vertical, (byte) use QT 1
(byte) 0x03, (byte) 0x11, (byte) 0x01,
// Define Quant table (section B.2.4.1)
(byte) 0xFF, (byte) 0xDB, // Marker
(byte) 0x00, (byte) 0x84, // Length (both tables)
(byte) 0x00, // 8 bit values, (byte) table 0
(byte) 0x10, (byte) 0x0B, (byte) 0x0C, (byte) 0x0E, (byte) 0x0C,
(byte) 0x0A, (byte) 0x10, (byte) 0x0E, (byte) 0x0D, (byte) 0x0E,
(byte) 0x12, (byte) 0x11, (byte) 0x10, (byte) 0x13, (byte) 0x18,
(byte) 0x28, (byte) 0x1A, (byte) 0x18, (byte) 0x16, (byte) 0x16,
(byte) 0x18, (byte) 0x31, (byte) 0x23, (byte) 0x25, (byte) 0x1D,
(byte) 0x28, (byte) 0x3A, (byte) 0x33, (byte) 0x3D, (byte) 0x3C,
(byte) 0x39, (byte) 0x33, (byte) 0x38, (byte) 0x37, (byte) 0x40,
(byte) 0x48, (byte) 0x5C, (byte) 0x4E, (byte) 0x40, (byte) 0x44,
(byte) 0x57, (byte) 0x45, (byte) 0x37, (byte) 0x38, (byte) 0x50,
(byte) 0x6D, (byte) 0x51, (byte) 0x57, (byte) 0x5F, (byte) 0x62,
(byte) 0x67, (byte) 0x68, (byte) 0x67, (byte) 0x3E, (byte) 0x4D,
(byte) 0x71, (byte) 0x79, (byte) 0x70, (byte) 0x64, (byte) 0x78,
(byte) 0x5C, (byte) 0x65, (byte) 0x67, (byte) 0x63,
(byte) 0x01, // 8 bit values, (byte) table 1
(byte) 0x11, (byte) 0x12, (byte) 0x12, (byte) 0x18, (byte) 0x15,
(byte) 0x18, (byte) 0x2F, (byte) 0x1A, (byte) 0x1A, (byte) 0x2F,
(byte) 0x63, (byte) 0x42, (byte) 0x38, (byte) 0x42, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
// Define huffman table (section B.2.4.1)
(byte) 0xFF, (byte) 0xC4, // Marker
(byte) 0x00, (byte) 0x1F, // Length (31 bytes)
(byte) 0x00, // DC, (byte) table 0
(byte) 0x00, (byte) 0x01, (byte) 0x05, (byte) 0x01, (byte) 0x01,
(byte) 0x01, (byte) 0x01, (byte) 0x01, (byte) 0x01, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03,
(byte) 0x04, (byte) 0x05, (byte) 0x06, (byte) 0x07, (byte) 0x08,
(byte) 0x09, (byte) 0x0A, (byte) 0x0B,
// Define huffman table (section B.2.4.1)
(byte) 0xFF, (byte) 0xC4, // Marker
(byte) 0x00, (byte) 0xB5, // Length (181 bytes)
(byte) 0x10, // AC, (byte) table 0
(byte) 0x00, (byte) 0x02, (byte) 0x01, (byte) 0x03, (byte) 0x03,
(byte) 0x02, (byte) 0x04, (byte) 0x03, (byte) 0x05, (byte) 0x05,
(byte) 0x04, (byte) 0x04, (byte) 0x00, (byte) 0x00, (byte) 0x01,
(byte) 0x7D, (byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x00,
(byte) 0x04, (byte) 0x11, (byte) 0x05, (byte) 0x12, (byte) 0x21,
(byte) 0x31, (byte) 0x41, (byte) 0x06, (byte) 0x13, (byte) 0x51,
(byte) 0x61, (byte) 0x07, (byte) 0x22, (byte) 0x71, (byte) 0x14,
(byte) 0x32, (byte) 0x81, (byte) 0x91, (byte) 0xA1, (byte) 0x08,
(byte) 0x23, (byte) 0x42, (byte) 0xB1, (byte) 0xC1, (byte) 0x15,
(byte) 0x52, (byte) 0xD1, (byte) 0xF0, (byte) 0x24, (byte) 0x33,
(byte) 0x62, (byte) 0x72, (byte) 0x82, (byte) 0x09, (byte) 0x0A,
(byte) 0x16, (byte) 0x17, (byte) 0x18, (byte) 0x19, (byte) 0x1A,
(byte) 0x25, (byte) 0x26, (byte) 0x27, (byte) 0x28, (byte) 0x29,
(byte) 0x2A, (byte) 0x34, (byte) 0x35, (byte) 0x36, (byte) 0x37,
(byte) 0x38, (byte) 0x39, (byte) 0x3A, (byte) 0x43, (byte) 0x44,
(byte) 0x45, (byte) 0x46, (byte) 0x47, (byte) 0x48, (byte) 0x49,
(byte) 0x4A, (byte) 0x53, (byte) 0x54, (byte) 0x55, (byte) 0x56,
(byte) 0x57, (byte) 0x58, (byte) 0x59, (byte) 0x5A, (byte) 0x63,
(byte) 0x64, (byte) 0x65, (byte) 0x66, (byte) 0x67, (byte) 0x68,
(byte) 0x69, (byte) 0x6A, (byte) 0x73, (byte) 0x74, (byte) 0x75,
(byte) 0x76, (byte) 0x77, (byte) 0x78, (byte) 0x79, (byte) 0x7A,
(byte) 0x83, (byte) 0x84, (byte) 0x85, (byte) 0x86, (byte) 0x87,
(byte) 0x88, (byte) 0x89, (byte) 0x8A, (byte) 0x92, (byte) 0x93,
(byte) 0x94, (byte) 0x95, (byte) 0x96, (byte) 0x97, (byte) 0x98,
(byte) 0x99, (byte) 0x9A, (byte) 0xA2, (byte) 0xA3, (byte) 0xA4,
(byte) 0xA5, (byte) 0xA6, (byte) 0xA7, (byte) 0xA8, (byte) 0xA9,
(byte) 0xAA, (byte) 0xB2, (byte) 0xB3, (byte) 0xB4, (byte) 0xB5,
(byte) 0xB6, (byte) 0xB7, (byte) 0xB8, (byte) 0xB9, (byte) 0xBA,
(byte) 0xC2, (byte) 0xC3, (byte) 0xC4, (byte) 0xC5, (byte) 0xC6,
(byte) 0xC7, (byte) 0xC8, (byte) 0xC9, (byte) 0xCA, (byte) 0xD2,
(byte) 0xD3, (byte) 0xD4, (byte) 0xD5, (byte) 0xD6, (byte) 0xD7,
(byte) 0xD8, (byte) 0xD9, (byte) 0xDA, (byte) 0xE1, (byte) 0xE2,
(byte) 0xE3, (byte) 0xE4, (byte) 0xE5, (byte) 0xE6, (byte) 0xE7,
(byte) 0xE8, (byte) 0xE9, (byte) 0xEA, (byte) 0xF1, (byte) 0xF2,
(byte) 0xF3, (byte) 0xF4, (byte) 0xF5, (byte) 0xF6, (byte) 0xF7,
(byte) 0xF8, (byte) 0xF9, (byte) 0xFA,
// Define huffman table (section B.2.4.1)
(byte) 0xFF, (byte) 0xC4, // Marker
(byte) 0x00, (byte) 0x1F, // Length (31 bytes)
(byte) 0x01, // DC, (byte) table 1
(byte) 0x00, (byte) 0x03, (byte) 0x01, (byte) 0x01, (byte) 0x01,
(byte) 0x01, (byte) 0x01, (byte) 0x01, (byte) 0x01, (byte) 0x01,
(byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03,
(byte) 0x04, (byte) 0x05, (byte) 0x06, (byte) 0x07, (byte) 0x08,
(byte) 0x09, (byte) 0x0A, (byte) 0x0B,
// Define huffman table (section B.2.4.1)
(byte) 0xFF, (byte) 0xC4, // Marker
(byte) 0x00, (byte) 0xB5, // Length (181 bytes)
(byte) 0x11, // AC, (byte) table 1
(byte) 0x00, (byte) 0x02, (byte) 0x01, (byte) 0x02, (byte) 0x04,
(byte) 0x04, (byte) 0x03, (byte) 0x04, (byte) 0x07, (byte) 0x05,
(byte) 0x04, (byte) 0x04, (byte) 0x00, (byte) 0x01, (byte) 0x02,
(byte) 0x77, (byte) 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03,
(byte) 0x11, (byte) 0x04, (byte) 0x05, (byte) 0x21, (byte) 0x31,
(byte) 0x06, (byte) 0x12, (byte) 0x41, (byte) 0x51, (byte) 0x07,
(byte) 0x61, (byte) 0x71, (byte) 0x13, (byte) 0x22, (byte) 0x32,
(byte) 0x81, (byte) 0x08, (byte) 0x14, (byte) 0x42, (byte) 0x91,
(byte) 0xA1, (byte) 0xB1, (byte) 0xC1, (byte) 0x09, (byte) 0x23,
(byte) 0x33, (byte) 0x52, (byte) 0xF0, (byte) 0x15, (byte) 0x62,
(byte) 0x72, (byte) 0xD1, (byte) 0x0A, (byte) 0x16, (byte) 0x24,
(byte) 0x34, (byte) 0xE1, (byte) 0x25, (byte) 0xF1, (byte) 0x17,
(byte) 0x18, (byte) 0x19, (byte) 0x1A, (byte) 0x26, (byte) 0x27,
(byte) 0x28, (byte) 0x29, (byte) 0x2A, (byte) 0x35, (byte) 0x36,
(byte) 0x37, (byte) 0x38, (byte) 0x39, (byte) 0x3A, (byte) 0x43,
(byte) 0x44, (byte) 0x45, (byte) 0x46, (byte) 0x47, (byte) 0x48,
(byte) 0x49, (byte) 0x4A, (byte) 0x53, (byte) 0x54, (byte) 0x55,
(byte) 0x56, (byte) 0x57, (byte) 0x58, (byte) 0x59, (byte) 0x5A,
(byte) 0x63, (byte) 0x64, (byte) 0x65, (byte) 0x66, (byte) 0x67,
(byte) 0x68, (byte) 0x69, (byte) 0x6A, (byte) 0x73, (byte) 0x74,
(byte) 0x75, (byte) 0x76, (byte) 0x77, (byte) 0x78, (byte) 0x79,
(byte) 0x7A, (byte) 0x82, (byte) 0x83, (byte) 0x84, (byte) 0x85,
(byte) 0x86, (byte) 0x87, (byte) 0x88, (byte) 0x89, (byte) 0x8A,
(byte) 0x92, (byte) 0x93, (byte) 0x94, (byte) 0x95, (byte) 0x96,
(byte) 0x97, (byte) 0x98, (byte) 0x99, (byte) 0x9A, (byte) 0xA2,
(byte) 0xA3, (byte) 0xA4, (byte) 0xA5, (byte) 0xA6, (byte) 0xA7,
(byte) 0xA8, (byte) 0xA9, (byte) 0xAA, (byte) 0xB2, (byte) 0xB3,
(byte) 0xB4, (byte) 0xB5, (byte) 0xB6, (byte) 0xB7, (byte) 0xB8,
(byte) 0xB9, (byte) 0xBA, (byte) 0xC2, (byte) 0xC3, (byte) 0xC4,
(byte) 0xC5, (byte) 0xC6, (byte) 0xC7, (byte) 0xC8, (byte) 0xC9,
(byte) 0xCA, (byte) 0xD2, (byte) 0xD3, (byte) 0xD4, (byte) 0xD5,
(byte) 0xD6, (byte) 0xD7, (byte) 0xD8, (byte) 0xD9, (byte) 0xDA,
(byte) 0xE2, (byte) 0xE3, (byte) 0xE4, (byte) 0xE5, (byte) 0xE6,
(byte) 0xE7, (byte) 0xE8, (byte) 0xE9, (byte) 0xEA, (byte) 0xF2,
(byte) 0xF3, (byte) 0xF4, (byte) 0xF5, (byte) 0xF6, (byte) 0xF7,
(byte) 0xF8, (byte) 0xF9, (byte) 0xFA,
// Start of Scan (section B.2.3)
(byte) 0xFF, (byte) 0xDA, // Marker
(byte) 0x00, (byte) 0x0C, // Length of header
(byte) 0x03, // Number of image components
// Scan 1: use DC/AC huff tables 0/0
(byte) 0x01, (byte) 0x00,
// Scan 2: use DC/AC huff tables 1/1
(byte) 0x02, (byte) 0x11,
// Scan 3: use DC/AC huff tables 1/1
(byte) 0x03, (byte) 0x11,
(byte) 0x00, (byte) 0x3F, (byte) 0x00 // Not used
};
// This array represents the default JFIF header for quality = 100 and
// size = 640x480, without Huffman tables. The values are adjusted when a
// file is generated.
private static byte[] jfifNoHuff100Header = {
// SOI
(byte) 0xFF, (byte) 0xD8,
// JFIF header
(byte) 0xFF, (byte) 0xE0, // Marker
(byte) 0x00, (byte) 0x10, // Length = 16 bytes
(byte) 0x4A, (byte) 0x46, (byte) 0x49, (byte) 0x46, // "JFIF"
(byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x00, (byte) 0x00,
(byte) 0x01, (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00,
// Start of frame (section B.2.2)
(byte) 0xFF, (byte) 0xC0, // Baseline DCT
(byte) 0x00, (byte) 0x11, // Length = 17 bytes
(byte) 0x08, // Sample precision
(byte) 0x01, (byte) 0xE0, // Height
(byte) 0x02, (byte) 0x80, // Width
(byte) 0x03, // Number of components = 3
// Scan 1: 2:1 horiz, (byte) 1:1 vertical, (byte) use QT 0
(byte) 0x01, (byte) 0x21, (byte) 0x00,
// Scan 2: 1:1 horiz, (byte) 1:1 vertical, (byte) use QT 1
(byte) 0x02, (byte) 0x11, (byte) 0x01,
// Scan 3: 1:1 horiz, (byte) 1:1 vertical, (byte) use QT 1
(byte) 0x03, (byte) 0x11, (byte) 0x01,
// Define Quant table (section B.2.4.1)
(byte) 0xFF, (byte) 0xDB, // Marker
(byte) 0x00, (byte) 0x84, // Length (both tables)
(byte) 0x00, // 8 bit values, (byte) table 0
(byte) 0x10, (byte) 0x0B, (byte) 0x0C, (byte) 0x0E, (byte) 0x0C,
(byte) 0x0A, (byte) 0x10, (byte) 0x0E, (byte) 0x0D, (byte) 0x0E,
(byte) 0x12, (byte) 0x11, (byte) 0x10, (byte) 0x13, (byte) 0x18,
(byte) 0x28, (byte) 0x1A, (byte) 0x18, (byte) 0x16, (byte) 0x16,
(byte) 0x18, (byte) 0x31, (byte) 0x23, (byte) 0x25, (byte) 0x1D,
(byte) 0x28, (byte) 0x3A, (byte) 0x33, (byte) 0x3D, (byte) 0x3C,
(byte) 0x39, (byte) 0x33, (byte) 0x38, (byte) 0x37, (byte) 0x40,
(byte) 0x48, (byte) 0x5C, (byte) 0x4E, (byte) 0x40, (byte) 0x44,
(byte) 0x57, (byte) 0x45, (byte) 0x37, (byte) 0x38, (byte) 0x50,
(byte) 0x6D, (byte) 0x51, (byte) 0x57, (byte) 0x5F, (byte) 0x62,
(byte) 0x67, (byte) 0x68, (byte) 0x67, (byte) 0x3E, (byte) 0x4D,
(byte) 0x71, (byte) 0x79, (byte) 0x70, (byte) 0x64, (byte) 0x78,
(byte) 0x5C, (byte) 0x65, (byte) 0x67, (byte) 0x63,
(byte) 0x01, // 8 bit values, (byte) table 1
(byte) 0x11, (byte) 0x12, (byte) 0x12, (byte) 0x18, (byte) 0x15,
(byte) 0x18, (byte) 0x2F, (byte) 0x1A, (byte) 0x1A, (byte) 0x2F,
(byte) 0x63, (byte) 0x42, (byte) 0x38, (byte) 0x42, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
(byte) 0x63, (byte) 0x63, (byte) 0x63, (byte) 0x63,
// Start of Scan (section B.2.3)
(byte) 0xFF, (byte) 0xDA, // Marker
(byte) 0x00, (byte) 0x0C, // Length of header
(byte) 0x03, // Number of image components
// Scan 1: use DC/AC huff tables 0/0
(byte) 0x01, (byte) 0x00,
// Scan 2: use DC/AC huff tables 1/1
(byte) 0x02, (byte) 0x11,
// Scan 3: use DC/AC huff tables 1/1
(byte) 0x03, (byte) 0x11,
(byte) 0x00, (byte) 0x3F, (byte) 0x00 // Not used
};
private void writeJfifHuffHeader() throws IOException {
byte[] newHeader = new byte[jfifHuff100Header.length];
System.arraycopy(jfifHuff100Header, 0, newHeader, 0, jfifHuff100Header.length);
// Set image width in JFIF header.
newHeader[27] = (byte) ((width >>> 8) & 0xff);
newHeader[28] = (byte) (width & 0xff);
// Set image height in JFIF header.
newHeader[25] = (byte) ((height >>> 8) & 0xff);
newHeader[26] = (byte) (height & 0xff);
// Adjust the quality factor.
//
// The default quality factor is 100, therefore if
// our quality factor does not equal 100 we must
// scale the quantization matrices in the JFIF header.
// Note that values are clipped to a max of 255.
if (qfactor != 100) {
for (int i = 44; i < 108; ++i) {
int t = (newHeader[i] * qfactor) / 100;
newHeader[i] = (byte) Math.max(t, 0xff);
}
for (int i = 109; i < 173; ++i) {
int t = (newHeader[i] * qfactor) / 100;
newHeader[i] = (byte) Math.max(t, 0xff);
}
}
// Write out buffer.
out.write(newHeader);
}
private void writeJfifNoHuffHeader() throws IOException {
byte[] newHeader = new byte[jfifNoHuff100Header.length];
System.arraycopy(jfifNoHuff100Header, 0, newHeader, 0, jfifNoHuff100Header.length);
// Set image width in JFIF header.
newHeader[27] = (byte) ((width >>> 8) & 0xff);
newHeader[28] = (byte) (width & 0xff);
// Set image height in JFIF header.
newHeader[25] = (byte) ((height >>> 8) & 0xff);
newHeader[26] = (byte) (height & 0xff);
// Adjust the quality factor.
//
// The default quality factor is 100, therefore if
// our quality factor does not equal 100 we must
// scale the quantization matrices in the JFIF header.
// Note that values are clipped to a max of 255.
if (qfactor != 100) {
for (int i = 44; i < 108; ++i) {
int t = (newHeader[i] * qfactor) / 100;
newHeader[i] = (byte) Math.max(t, 0xff);
}
for (int i = 109; i < 173; ++i) {
int t = (newHeader[i] * qfactor) / 100;
newHeader[i] = (byte) Math.max(t, 0xff);
}
}
// Write out buffer.
out.write(newHeader);
}
}