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Work in progress: CCITT Encoder

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Schmidor 2015-10-04 00:40:36 +02:00
parent bad9aebdee
commit 8e11d95fd6
2 changed files with 217 additions and 16 deletions
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163
imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/CCITTFaxEncoderStream.java
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@ -1,11 +1,45 @@
/*
* Copyright (c) 2013, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name "TwelveMonkeys" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
package com.twelvemonkeys.imageio.plugins.tiff;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import com.twelvemonkeys.lang.Validate;
/**
* CCITT Modified Huffman RLE, Group 3 (T4) and Group 4 (T6) fax compression.
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author$
* @version $Id$
*/
public class CCITTFaxEncoderStream extends OutputStream {
private int currentBufferLength = 0;
@ -65,6 +99,17 @@ public class CCITTFaxEncoderStream extends OutputStream {
}
}
@Override
public void flush() throws IOException {
stream.flush();
}
@Override
public void close() throws IOException {
fill();
stream.close();
}
// TODO: when to write end EOLs, half filled buffer bytes etc. on end?
private void encodeRow() throws IOException {
@ -108,11 +153,14 @@ public class CCITTFaxEncoderStream extends OutputStream {
if (optionG32D) {
// TODO decide whether 1d or 2d row, write k, encode
} else {
// TODO encode1d
encode1D();
}
if (optionG3Fill) {
fill();
}
}
private void encodeRowType6() {
private void encodeRowType6() throws IOException {
encode2D();
}
@ -145,8 +193,65 @@ public class CCITTFaxEncoderStream extends OutputStream {
}
}
private void encode2D() {
private void encode2D() throws IOException {
boolean white = true;
int lastChange = -1;
for (int i = 0; i < changesCurrentRowLength; i++) { // TODO
// columns-Basiert
// statt references
int nextChange = changesCurrentRow[i];
int nextRef = getNextRefChange(lastChange);
int difference = nextRef - nextChange;
if (difference < -3) {
// next change nearer than nextRef, PMODE
write(1, 4);
lastChange = nextRef;
} else if (difference > 3) {
// next change farer than nextRef, hmode
write(1, 3);
// write runLength(white)
// write runLength(!white)
// i++;
// lastChange = ...
} else {
// VMODE
switch (difference) {
case 0:
write(1, 1);
break;
case 1:
write(3, 3);
break;
case 2:
write(3, 6);
break;
case 3:
write(3, 7);
break;
case -1:
write(2, 3);
break;
case -2:
write(2, 6);
break;
case -3:
write(2, 7);
break;
}
white = !white;
}
}
}
private int getNextRefChange(int currentRowChange) {
for (int i = 0; i < changesReferenceRowLength; i++) {
if (changesReferenceRow[i] > currentRowChange) {
return changesReferenceRow[i];
}
}
return columns;
}
private void write(int code, int codeLength) throws IOException {
@ -188,12 +293,7 @@ public class CCITTFaxEncoderStream extends OutputStream {
outputBufferBitLength = 0;
}
private static class Code {
public static Code create(int code, int length) {
Code c = new Code(code, length);
return c;
}
public static class Code {
private Code(int code, int length) {
this.code = code;
this.length = length;
@ -203,11 +303,46 @@ public class CCITTFaxEncoderStream extends OutputStream {
final int length;
}
private Code[] WHITE_TERMINATING_CODES = {};
public static final Code[] WHITE_TERMINATING_CODES;
private Code[] WHITE_NONTERMINATING_CODES = {};
public static final Code[] WHITE_NONTERMINATING_CODES;
private Code[] BLACK_TERMINATING_CODES = {};
public static final Code[] BLACK_TERMINATING_CODES;
private Code[] BLACK_NONTERMINATING_CODES = {};
public static final Code[] BLACK_NONTERMINATING_CODES;
static {
// Setup HUFFMAN Codes
WHITE_TERMINATING_CODES = new Code[64];
WHITE_NONTERMINATING_CODES = new Code[40];
for (int i = 0; i < CCITTFaxDecoderStream.WHITE_CODES.length; i++) {
int bitLength = i + 4;
for (int j = 0; j < CCITTFaxDecoderStream.WHITE_CODES[i].length; j++) {
int value = CCITTFaxDecoderStream.WHITE_RUN_LENGTHS[i][j];
int code = CCITTFaxDecoderStream.WHITE_CODES[i][j];
if (value < 64) {
WHITE_TERMINATING_CODES[value] = new Code(code, bitLength);
} else {
WHITE_NONTERMINATING_CODES[(value / 64) - 1] = new Code(code, bitLength);
}
}
}
BLACK_TERMINATING_CODES = new Code[64];
BLACK_NONTERMINATING_CODES = new Code[40];
for (int i = 0; i < CCITTFaxDecoderStream.BLACK_CODES.length; i++) {
int bitLength = i + 2;
for (int j = 0; j < CCITTFaxDecoderStream.BLACK_CODES[i].length; j++) {
int value = CCITTFaxDecoderStream.BLACK_RUN_LENGTHS[i][j];
int code = CCITTFaxDecoderStream.BLACK_CODES[i][j];
if (value < 64) {
BLACK_TERMINATING_CODES[value] = new Code(code, bitLength);
} else {
BLACK_NONTERMINATING_CODES[(value / 64) - 1] = new Code(code, bitLength);
}
}
}
}
}

66
imageio/imageio-tiff/src/test/java/com/twelvemonkeys/imageio/plugins/tiff/CCITTFaxEncoderStreamTest.java Normal file
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@ -0,0 +1,66 @@
/*
* Copyright (c) 2013, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name "TwelveMonkeys" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
package com.twelvemonkeys.imageio.plugins.tiff;
import org.junit.Test;
import com.twelvemonkeys.imageio.plugins.tiff.CCITTFaxEncoderStream.Code;
import java.io.IOException;
import static org.junit.Assert.*;
/**
* CCITTFaxEncoderStreamTest
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author$
* @version $Id$
*/
public class CCITTFaxEncoderStreamTest {
@Test
public void testBuildCodes() throws IOException {
assertTrue(CCITTFaxEncoderStream.WHITE_TERMINATING_CODES.length == 64);
for (Code code : CCITTFaxEncoderStream.WHITE_TERMINATING_CODES) {
assertNotNull(code);
}
assertTrue(CCITTFaxEncoderStream.WHITE_NONTERMINATING_CODES.length == 40);
for (Code code : CCITTFaxEncoderStream.WHITE_NONTERMINATING_CODES) {
assertNotNull(code);
}
assertTrue(CCITTFaxEncoderStream.BLACK_TERMINATING_CODES.length == 64);
for (Code code : CCITTFaxEncoderStream.BLACK_TERMINATING_CODES) {
assertNotNull(code);
}
assertTrue(CCITTFaxEncoderStream.BLACK_NONTERMINATING_CODES.length == 40);
for (Code code : CCITTFaxEncoderStream.BLACK_NONTERMINATING_CODES) {
assertNotNull(code);
}
}
}