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fixed PNG loader to support indexed color

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LAX1DUDE 2022-03-21 01:26:04 -07:00
parent 3e17d57250
commit 94a8c3f6e9
15 changed files with 512 additions and 485 deletions
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89
src/main/java/com/baislsl/png/chunk/Chunk.java
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@ -6,58 +6,57 @@ import com.baislsl.png.util.ByteHandler;
* Created by baislsl on 17-7-9.
*/
public class Chunk {
protected long length;
protected ChunkType type;
protected byte[] data;
protected byte[] crc = new byte[4];
protected long length;
protected ChunkType type;
protected byte[] data;
protected byte[] crc = new byte[4];
public byte[] dump() {
byte[] output = new byte[4 + 4 + data.length + 4];
Byte[] lengthBytes = new Byte[4];
for (int i = 0; i < 4; i++) {
output[3 - i] = (byte) (length & 0xff);
}
String typeName = type.name().toUpperCase();
for (int i = 0; i < 4; i++) {
output[4 + i] = (byte) typeName.charAt(i);
}
System.arraycopy(data, 0, output, 8, data.length);
System.arraycopy(crc, 0, output, output.length - crc.length, crc.length);
return output;
}
public byte[] dump() {
byte[] output = new byte[4 + 4 + data.length + 4];
Byte[] lengthBytes = new Byte[4];
for (int i = 0; i < 4; i++) {
output[3 - i] = (byte) (length & 0xff);
}
String typeName = type.name().toUpperCase();
for (int i = 0; i < 4; i++) {
output[4 + i] = (byte) typeName.charAt(i);
}
System.arraycopy(data, 0, output, 8, data.length);
System.arraycopy(crc, 0, output, output.length - crc.length, crc.length);
return output;
}
protected Chunk(byte[] length, byte[] type, byte[] data, byte[] crc) {
this.length = ByteHandler.byteToLong(length);
this.data = data;
this.crc = crc;
protected Chunk(byte[] length, byte[] type, byte[] data, byte[] crc) {
this.length = ByteHandler.byteToLong(length);
this.data = data;
this.crc = crc;
for (ChunkType chunkType : ChunkType.values()) {
if (chunkType.name().equals(ByteHandler.byteToString(type))) {
this.type = chunkType;
break;
}
}
for (ChunkType chunkType : ChunkType.values()) {
if (chunkType.name().equals(ByteHandler.byteToString(type))) {
this.type = chunkType;
break;
}
}
}
}
public long dataLength() {
return data.length;
}
public long dataLength() {
return data.length;
}
public long getLength() {
return length;
}
public long getLength() {
return length;
}
public ChunkType getType() {
return type;
}
public ChunkType getType() {
return type;
}
public byte[] getData() {
return data;
}
public byte[] getData() {
return data;
}
public byte[] getCrc() {
return crc;
}
public byte[] getCrc() {
return crc;
}
}

56
src/main/java/com/baislsl/png/chunk/ChunkType.java
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@ -8,31 +8,37 @@ import com.baislsl.png.decode.PNG;
*/
public enum ChunkType {
IHDR {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setIhdr(new IHDR(length, type, data, crc));
}
},
PLTE {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setPlte(new PLTE(length, type, data, crc));
}
},
IDAT {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.add(new IDAT(length, type, data, crc));
}
},
IEND {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setIend(new IEND(length, type, data, crc));
}
};
IHDR {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setIhdr(new IHDR(length, type, data, crc));
}
},
tRNS {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setTrns(new tRNS(length, type, data, crc));
}
},
PLTE {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setPlte(new PLTE(length, type, data, crc));
}
},
IDAT {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.add(new IDAT(length, type, data, crc));
}
},
IEND {
@Override
public void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
png.setIend(new IEND(length, type, data, crc));
}
};
public abstract void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException;
public abstract void apply(PNG png, byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException;
}

6
src/main/java/com/baislsl/png/chunk/IDAT.java
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@ -5,7 +5,7 @@ package com.baislsl.png.chunk;
*/
public class IDAT extends Chunk {
public IDAT(byte[] length, byte[] type, byte[] data, byte[] crc) {
super(length, type, data, crc);
}
public IDAT(byte[] length, byte[] type, byte[] data, byte[] crc) {
super(length, type, data, crc);
}
}

6
src/main/java/com/baislsl/png/chunk/IEND.java
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@ -4,7 +4,7 @@ package com.baislsl.png.chunk;
* Created by baislsl on 17-7-9.
*/
public class IEND extends Chunk {
public IEND(byte[] length, byte[] type, byte[] data, byte[] crc) {
super(length, type, data, crc);
}
public IEND(byte[] length, byte[] type, byte[] data, byte[] crc) {
super(length, type, data, crc);
}
}

189
src/main/java/com/baislsl/png/chunk/IHDR.java
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@ -7,112 +7,113 @@ import com.baislsl.png.util.ByteHandler;
* Created by baislsl on 17-7-9.
*/
public class IHDR extends Chunk {
private long width, height;
private int bitDepth, colorType, compressionMethod, filterMethod, interlaceMethod;
private long width, height;
private int bitDepth, colorType, compressionMethod, filterMethod, interlaceMethod;
final private static int[] colorTypeValid = {0, 2, 3, 4, 6};
final private static int[][] mapColorBitDepth = {
{1, 2, 4, 8, 16}, // color type = 0
{},
{8, 16}, // color type = 2
{1, 2, 4, 8}, // color type = 3
{8, 16}, // color type = 4
{},
{8, 16} // color type = 6
};
final private static int[] colorTypeValid = { 0, 2, 3, 4, 6 };
final private static int[][] mapColorBitDepth = { { 1, 2, 4, 8, 16 }, // color type = 0
{}, { 8, 16 }, // color type = 2
{ 1, 2, 4, 8 }, // color type = 3
{ 8, 16 }, // color type = 4
{}, { 8, 16 } // color type = 6
};
// the number of bytes per complete pixel, rounding up to one
public int getBpp() {
if (colorType == 2) { // Each pixel is an R,G,B triple.
return 3;
} else if (colorType == 6) { // Each pixel is an R,G,B triple, followed by an alpha sample.
return 4;
} else if (colorType == 3) { // palette index, roll up to 1
return 1;
} else {
//LOG.error("Error when find bpp");
return 0;
}
}
// the number of bytes per complete pixel, rounding up to one
public int getBpp() {
if (colorType == 2) { // Each pixel is an R,G,B triple.
return 3;
} else if (colorType == 6) { // Each pixel is an R,G,B triple, followed by an alpha sample.
return 4;
} else if (colorType == 3) { // palette index, roll up to 1
return 1;
} else {
// LOG.error("Error when find bpp");
return 0;
}
}
public IHDR(byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
super(length, type, data, crc);
build();
checkLegal();
}
public IHDR(byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
super(length, type, data, crc);
build();
checkLegal();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("width=");sb.append(width);
sb.append("height=");sb.append(height);
sb.append("bitDepth=");sb.append(bitDepth);
sb.append("colorType=");sb.append(colorType);
sb.append("compressionMethod=");sb.append(compressionMethod);
sb.append("filterMethod=");sb.append(filterMethod);
sb.append("interlaceMethod=");sb.append(interlaceMethod);
return sb.toString();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("width=");
sb.append(width);
sb.append("height=");
sb.append(height);
sb.append("bitDepth=");
sb.append(bitDepth);
sb.append("colorType=");
sb.append(colorType);
sb.append("compressionMethod=");
sb.append(compressionMethod);
sb.append("filterMethod=");
sb.append(filterMethod);
sb.append("interlaceMethod=");
sb.append(interlaceMethod);
return sb.toString();
}
private void build() {
this.width = ByteHandler.byteToLong(data);
this.height = ByteHandler.byteToLong(data, 4);
this.bitDepth = ((int) data[8]) & 0xFF;
this.colorType = ((int) data[9]) & 0xFF;
this.compressionMethod = ((int) data[10]) & 0xFF;
this.filterMethod = ((int) data[11]) & 0xFF;
this.interlaceMethod = ((int) data[12]) & 0xFF;
}
private void build() {
this.width = ByteHandler.byteToLong(data);
this.height = ByteHandler.byteToLong(data, 4);
this.bitDepth = ((int)data[8]) & 0xFF;
this.colorType = ((int)data[9]) & 0xFF;
this.compressionMethod = ((int)data[10]) & 0xFF;
this.filterMethod = ((int)data[11]) & 0xFF;
this.interlaceMethod = ((int)data[12]) & 0xFF;
}
private void checkLegal() throws DecodeException {
boolean legal = false;
for (int c : colorTypeValid) {
if (c == colorType) {
legal = true;
break;
}
}
if (!legal) {
throw new DecodeException("Initialize IHDR : color type not legal to be " + colorType);
}
for (int b : mapColorBitDepth[colorType]) {
if (b == bitDepth) {
return;
}
}
throw new DecodeException(
"Initialzie IHDR : bit depth " + bitDepth + " not valid matching color type " + colorType);
}
public long getWidth() {
return this.width;
}
private void checkLegal() throws DecodeException {
boolean legal = false;
for (int c : colorTypeValid) {
if (c == colorType) {
legal = true;
break;
}
}
if (!legal) {
throw new DecodeException("Initialize IHDR : color type not legal to be " + colorType);
}
for (int b : mapColorBitDepth[colorType]) {
if (b == bitDepth) {
return;
}
}
throw new DecodeException("Initialzie IHDR : bit depth " + bitDepth + " not valid matching color type " + colorType);
}
public long getHeight() {
return this.height;
}
public int getBitDepth() {
return bitDepth;
}
public long getWidth() {
return this.width;
}
public int getColorType() {
return colorType;
}
public long getHeight() {
return this.height;
}
public int getCompressionMethod() {
return compressionMethod;
}
public int getBitDepth() {
return bitDepth;
}
public int getColorType() {
return colorType;
}
public int getCompressionMethod() {
return compressionMethod;
}
public int getFilterMethod() {
return filterMethod;
}
public int getInterlaceMethod() {
return interlaceMethod;
}
public int getFilterMethod() {
return filterMethod;
}
public int getInterlaceMethod() {
return interlaceMethod;
}
}

45
src/main/java/com/baislsl/png/chunk/PLTE.java
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@ -2,37 +2,34 @@ package com.baislsl.png.chunk;
import com.baislsl.png.decode.DecodeException;
/**
* Created by baislsl on 17-7-9.
*/
public class PLTE extends Chunk {
private int[] color;
private int[] color;
public PLTE(byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException{
super(length, type, data, crc);
build();
}
public PLTE(byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
super(length, type, data, crc);
build();
}
private void build() throws DecodeException {
if (this.length % 3 != 0)
throw new DecodeException("PLTE length can not be divide by 3");
int size = (int) length / 3;
color = new int[size];
for (int i = 0; i < size; i++) {
color[i] = (((int) data[i * 3]) & 0xFF) << 16 | (((int) data[i * 3 + 1]) & 0xFF) << 8
| (((int) data[i * 3 + 2]) & 0xFF) | 0xFF000000;
}
}
private void build() throws DecodeException{
if(this.length % 3 != 0 )
throw new DecodeException("PLTE length can not be divide by 3");
int size = (int)length / 3;
color = new int[size];
for(int i=0;i<size;i++){
color[i] = (((int)data[i*3]) & 0xFF) << 16 | (((int)data[i*3 + 1]) & 0xFF) << 8 | (((int)data[i*3 + 2]) & 0xFF);
}
}
public int getColor(int i){
return color[i];
}
public int getPaletteSize(){
return color.length;
}
public int getColor(int i) {
return color[i];
}
public int getPaletteSize() {
return color.length;
}
}

18
src/main/java/com/baislsl/png/chunk/tRNS.java Normal file
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@ -0,0 +1,18 @@
package com.baislsl.png.chunk;
import com.baislsl.png.decode.DecodeException;
/**
* Created by baislsl on 17-7-9.
*/
public class tRNS extends Chunk {
public tRNS(byte[] length, byte[] type, byte[] data, byte[] crc) throws DecodeException {
super(length, type, data, crc);
}
public int getAlpha() {
return (int)data[0] & 0xFF;
}
}

21
src/main/java/com/baislsl/png/decode/DecodeException.java
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@ -5,17 +5,18 @@ package com.baislsl.png.decode;
*/
public class DecodeException extends Exception {
public DecodeException() {}
public DecodeException() {
}
public DecodeException(String message) {
super(message);
}
public DecodeException(String message) {
super(message);
}
public DecodeException(String message, Throwable cause) {
super(message, cause);
}
public DecodeException(String message, Throwable cause) {
super(message, cause);
}
public DecodeException(Throwable cause) {
super(cause);
}
public DecodeException(Throwable cause) {
super(cause);
}
}

138
src/main/java/com/baislsl/png/decode/Decoder.java
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@ -13,88 +13,84 @@ import static com.baislsl.png.util.ByteHandler.byteToLong;
* Created by baislsl on 17-7-9.
*/
public class Decoder {
//private final static Logger LOG = LoggerFactory.getLogger(Decoder.class);
private final InputStream in;
// private final static Logger LOG = LoggerFactory.getLogger(Decoder.class);
private final InputStream in;
private final static char[] head = {
0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a
};
private final static char[] head = { 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a };
public Decoder(InputStream in) {
this.in = in;
}
public Decoder(InputStream in) {
this.in = in;
}
private void readHeader() throws DecodeException, IOException {
byte[] header = readBytes(8);
for (int i = 0; i < 8; i++) {
if ((header[i] & 0xff) != (int) head[i])
throw new DecodeException("It seems that this is not a PNG files");
}
//LOG.info(ByteHandler.byteToString(header));
}
private void readHeader() throws DecodeException, IOException {
byte[] header = readBytes(8);
for (int i = 0; i < 8; i++) {
if ((header[i] & 0xff) != (int) head[i])
throw new DecodeException("It seems that this is not a PNG files");
}
// LOG.info(ByteHandler.byteToString(header));
}
private boolean readChunk(PNG png, String chunkName,
byte[] length, byte[] type,
byte[] data, byte[] crc) throws IOException, DecodeException {
for (ChunkType chunkType : ChunkType.values()) {
if (chunkType.name().equals(chunkName)) {
chunkType.apply(png, length, type, data, crc);
return true;
}
}
return false;
}
private boolean readChunk(PNG png, String chunkName, byte[] length, byte[] type, byte[] data, byte[] crc)
throws IOException, DecodeException {
for (ChunkType chunkType : ChunkType.values()) {
if (chunkType.name().equalsIgnoreCase(chunkName)) {
chunkType.apply(png, length, type, data, crc);
return true;
}
}
return false;
}
private boolean checkCrc(byte[] data, long crcNumber) {
return crcNumber == CRC.crc(data, data.length);
}
private boolean checkCrc(byte[] data, long crcNumber) {
return crcNumber == CRC.crc(data, data.length);
}
private boolean checkCrc(byte[] type, byte[] data, byte[] crc) {
long crcNumber = byteToLong(crc);
byte[] crcData = new byte[4 + data.length];
System.arraycopy(type, 0, crcData, 0, 4);
System.arraycopy(data, 0, crcData, 4, data.length);
private boolean checkCrc(byte[] type, byte[] data, byte[] crc) {
long crcNumber = byteToLong(crc);
byte[] crcData = new byte[4 + data.length];
System.arraycopy(type, 0, crcData, 0, 4);
System.arraycopy(data, 0, crcData, 4, data.length);
return checkCrc(crcData, crcNumber);
}
return checkCrc(crcData, crcNumber);
}
public PNG readInPNG() throws IOException, DecodeException {
PNG png = new PNG();
readHeader();
public PNG readInPNG() throws IOException, DecodeException {
PNG png = new PNG();
readHeader();
String chunkName;
do {
byte[] length = readBytes(4);
long size = byteToLong(length);
byte[] type = readBytes(4);
chunkName = ByteHandler.byteToString(type).toUpperCase();
if("IEND".equals(chunkName)) {
break;
}
byte[] data = readBytes((int) size);
byte[] crc = readBytes(4);
//LOG.info(ByteHandler.byteToString(type));
String chunkName;
do {
byte[] length = readBytes(4);
long size = byteToLong(length);
byte[] type = readBytes(4);
chunkName = ByteHandler.byteToString(type).toUpperCase();
if ("IEND".equals(chunkName)) {
break;
}
byte[] data = readBytes((int) size);
byte[] crc = readBytes(4);
// LOG.info(ByteHandler.byteToString(type));
boolean found = readChunk(png, chunkName, length, type, data, crc);
if (!found) {
//LOG.info("Not support chunk name {}", chunkName);
}
boolean found = readChunk(png, chunkName, length, type, data, crc);
if (!found) {
// LOG.info("Not support chunk name {}", chunkName);
}
boolean crcMatch = checkCrc(type, data, crc);
if (!crcMatch) {
throw new DecodeException("Error data stream for incorrect crc");
}
} while (!"IEND".equals(chunkName));
return png;
}
private byte[] readBytes(int size) throws IOException {
byte[] result = new byte[size];
int ret = in.read(result, 0, size);
if (ret == -1) return null;
return result;
}
boolean crcMatch = checkCrc(type, data, crc);
if (!crcMatch) {
throw new DecodeException("Error data stream for incorrect crc");
}
} while (!"IEND".equals(chunkName));
return png;
}
private byte[] readBytes(int size) throws IOException {
byte[] result = new byte[size];
int ret = in.read(result, 0, size);
if (ret == -1)
return null;
return result;
}
}

26
src/main/java/com/baislsl/png/decode/IDATManager.java
View File

@ -6,18 +6,18 @@ import java.util.ArrayList;
public class IDATManager extends ArrayList<IDAT> {
public byte[] getIDATData() {
int dataSize = 0;
for (IDAT idat : this) {
dataSize += idat.dataLength();
}
byte[] data = new byte[dataSize];
int curPos = 0;
for (IDAT idat : this) {
System.arraycopy(idat.getData(), 0, data, curPos, (int) idat.dataLength());
curPos += idat.dataLength();
}
return data;
}
public byte[] getIDATData() {
int dataSize = 0;
for (IDAT idat : this) {
dataSize += idat.dataLength();
}
byte[] data = new byte[dataSize];
int curPos = 0;
for (IDAT idat : this) {
System.arraycopy(idat.getData(), 0, data, curPos, (int) idat.dataLength());
curPos += idat.dataLength();
}
return data;
}
}

196
src/main/java/com/baislsl/png/decode/PNG.java
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@ -11,112 +11,122 @@ import java.io.IOException;
* Created by baislsl on 17-7-9.
*/
public class PNG {
//private final static Logger LOG = LoggerFactory.getLogger(PNG.class);
public IHDR ihdr;
public IDATManager idats = new IDATManager();
public PLTE plte;
public IEND iend;
// private final static Logger LOG = LoggerFactory.getLogger(PNG.class);
public IHDR ihdr;
public IDATManager idats = new IDATManager();
public PLTE plte;
public tRNS trns;
public IEND iend;
public PNG() {
}
public PNG() {
}
public boolean isAlpha() {
return this.trns != null || ihdr.getBpp() == 4;
}
public PNG(IHDR ihdr, IDATManager idats, PLTE plte, IEND iend) {
this.ihdr = ihdr;
this.idats = idats;
this.plte = plte;
this.iend = iend;
}
public int[] getColor() throws DecodeException {
byte[] rawData = idats.getIDATData();
byte[] uncompressData = applyLZ77(rawData);
byte[][] transferData = applyReverseFilter(uncompressData);
int[] colors = applyColorTransfer(transferData);
return colors;
}
public int[] getColor() throws DecodeException {
byte[] rawData = idats.getIDATData();
byte[] uncompressData = applyLZ77(rawData);
byte[][] transferData = applyReverseFilter(uncompressData);
int[] colors = applyColorTransfer(transferData);
return colors;
}
private int[] applyColorTransfer(byte[][] data) throws DecodeException {
int bpp = ihdr.getBpp();
int width = (int) ihdr.getWidth();
int height = (int) ihdr.getHeight();
int colorType = ihdr.getColorType();
int bitDepth = ihdr.getBitDepth();
int[] colors = new int[width * height];
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int idx = i * width + j;
switch (colorType) {
case 2:
if (bitDepth == 8) { // bpp = 3
colors[idx] = ((int) data[i][bpp * j] & 0xff) << 16 | ((int) data[i][bpp * j + 1] & 0xff) << 8
| ((int) data[i][bpp * j + 2] & 0xff);
} else {
throw new DecodeException("not supported");
}
break;
case 6:
if (bitDepth == 8) { // bpp = 4
colors[idx] = ((int) data[i][bpp * j] & 0xff) << 16 | ((int) data[i][bpp * j + 1] & 0xff) << 8
| ((int) data[i][bpp * j + 2] & 0xff) | ((int) data[i][bpp * j + 3] & 0xff) << 24;
} else {
throw new DecodeException("not supported");
}
break;
case 3:
int gap = 8 / bitDepth;
int a = (1 << bitDepth) - 1;
int b = gap - (j % gap) - 1;
int pi = (data[i][j / gap] >> (b * bitDepth)) & a;
if (trns != null && trns.getAlpha() == pi) {
colors[idx] = 0;
}else {
colors[idx] = plte.getColor(pi);
}
break;
default:
throw new DecodeException("Do not support color type " + colorType);
}
}
}
private int[] applyColorTransfer(byte[][] data) throws DecodeException {
int bpp = ihdr.getBpp();
int width = (int) ihdr.getWidth();
int height = (int) ihdr.getHeight();
int colorType = ihdr.getColorType();
int bitDepth = ihdr.getBitDepth();
int[] colors = new int[width * height];
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int idx = i * width + j;
switch (colorType) {
case 2:
if (bitDepth == 8) { // bpp = 3
colors[idx] = ((int)data[i][bpp * j] & 0xff) << 16 | ((int)data[i][bpp * j + 1] & 0xff) << 8 | ((int)data[i][bpp * j + 2] & 0xff);
}else {
throw new DecodeException("not supported");
}
break;
case 6:
if (bitDepth == 8) { // bpp = 4
colors[idx] = ((int)data[i][bpp * j] & 0xff) << 16 | ((int)data[i][bpp * j + 1] & 0xff) << 8 | ((int)data[i][bpp * j + 2] & 0xff) | ((int)data[i][bpp * j + 3] & 0xff) << 24;
}else {
throw new DecodeException("not supported");
}
break;
case 3:
int gap = 8 / bitDepth;
int a = (1 << bitDepth) - 1;
colors[idx] = plte.getColor(data[i][j / gap] & a);
break;
default:
throw new DecodeException("Do not support color type " + colorType);
}
}
}
return colors;
}
return colors;
}
private byte[] applyLZ77(byte[] data) throws DecodeException {
byte[] result;
try {
result = EaglerInflater.uncompress(data);
} catch (IOException e) {
// LOG.error("LZ77 decode error", e);
throw new DecodeException(e);
}
// LOG.info("Size after decode={}", result.length);
return result;
}
private byte[] applyLZ77(byte[] data) throws DecodeException {
byte[] result;
try {
result = EaglerInflater.uncompress(data);
} catch (IOException e) {
//LOG.error("LZ77 decode error", e);
throw new DecodeException(e);
}
//LOG.info("Size after decode={}", result.length);
return result;
}
private byte[][] applyReverseFilter(byte[] data) {
int width = (int) ihdr.getWidth(), height = (int) ihdr.getHeight();
return ReverseFilter.apply(data, width, height, ihdr.getBpp());
}
private byte[][] applyReverseFilter(byte[] data) {
int width = (int) ihdr.getWidth(), height = (int) ihdr.getHeight();
return ReverseFilter.apply(data, width, height, ihdr.getBpp());
}
public void setIdats(IDATManager idats) {
this.idats = idats;
}
public void setIdats(IDATManager idats) {
this.idats = idats;
}
public void setIhdr(IHDR ihdr) {
this.ihdr = ihdr;
}
public void setIhdr(IHDR ihdr) {
this.ihdr = ihdr;
}
public void setPlte(PLTE plte) {
this.plte = plte;
}
public void setPlte(PLTE plte) {
this.plte = plte;
}
public void setTrns(tRNS trns) {
this.trns = trns;
}
public void setIend(IEND iend) {
this.iend = iend;
}
public void setIend(IEND iend) {
this.iend = iend;
}
public void add(IDAT idat) throws DecodeException {
idats.add(idat);
}
public void add(IDAT idat) throws DecodeException {
idats.add(idat);
}
public long getWidth() {
return ihdr.getWidth();
}
public long getWidth() {
return ihdr.getWidth();
}
public long getHeight() {
return ihdr.getHeight();
}
public long getHeight() {
return ihdr.getHeight();
}
}

43
src/main/java/com/baislsl/png/util/ByteHandler.java
View File

@ -5,29 +5,28 @@ package com.baislsl.png.util;
*/
public class ByteHandler {
public static long byteToLong(byte[] data, int offset, int size){
long result = 0;
for(int i=0;i<size;i++){
result <<= 8;
result |= ((long)data[offset + i] & 0xff);
}
return result;
}
public static long byteToLong(byte[] data, int offset, int size) {
long result = 0;
for (int i = 0; i < size; i++) {
result <<= 8;
result |= ((long) data[offset + i] & 0xff);
}
return result;
}
public static long byteToLong(byte[] data, int offset){
return byteToLong(data, offset, 4);
}
public static long byteToLong(byte[] data, int offset) {
return byteToLong(data, offset, 4);
}
public static long byteToLong(byte[] data) {
return byteToLong(data, 0, 4);
}
public static long byteToLong(byte[] data) {
return byteToLong(data, 0, 4);
}
public static String byteToString(byte[] data) {
StringBuilder str = new StringBuilder();
for (byte b : data) {
str.append((char) (0x0ff & b));
}
return str.toString();
}
public static String byteToString(byte[] data) {
StringBuilder str = new StringBuilder();
for (byte b : data) {
str.append((char) (0x0ff & b));
}
return str.toString();
}
}

49
src/main/java/com/baislsl/png/util/CRC.java
View File

@ -4,33 +4,32 @@ package com.baislsl.png.util;
* Created by baislsl on 17-7-9.
*/
public class CRC {
private final static long[] crcTable = new long[256];
private final static long[] crcTable = new long[256];
static {
for (int i = 0; i < 256; i++) {
long c = i;
for (int k = 0; k < 8; k++) {
if ((c & 1) != 0) {
c = 0xedb88320L ^ (c >> 1);
} else {
c >>= 1;
}
}
crcTable[i] = c;
}
}
static {
for (int i = 0; i < 256; i++) {
long c = i;
for (int k = 0; k < 8; k++) {
if ((c & 1) != 0) {
c = 0xedb88320L ^ (c >> 1);
} else {
c >>= 1;
}
}
crcTable[i] = c;
}
}
private static long updateCrc(long crc, byte[] buf, int size) {
long ans = crc;
for (int i = 0; i < size; i++) {
ans = crcTable[(int) ((ans ^ buf[i]) & 0xff)] ^ (ans >> 8);
}
return ans;
}
private static long updateCrc(long crc, byte[] buf, int size){
long ans = crc;
for(int i=0;i<size;i++){
ans = crcTable[(int)((ans^buf[i])&0xff)] ^ (ans >> 8);
}
return ans;
}
public static long crc(byte[] buf, int size){
return updateCrc(0xffffffffL, buf, size) ^ 0xffffffffL;
}
public static long crc(byte[] buf, int size) {
return updateCrc(0xffffffffL, buf, size) ^ 0xffffffffL;
}
}

113
src/main/java/com/baislsl/png/util/ReverseFilter.java
View File

@ -1,63 +1,64 @@
package com.baislsl.png.util;
public class ReverseFilter {
private ReverseFilter(){}
private static int paethPredictor(int a, int b, int c) {
int p = a + b - c;
int pa = Math.abs(p - a), pb = Math.abs(p - b), pc = Math.abs(p - c);
if (pa <= pb && pa <= pc) return a;
if (pb <= pc) return b;
return c;
}
private ReverseFilter() {
}
// apply reverse Filter Algorithms to byte data
// bpp = 3
public static byte[][] apply(byte[] data, int width, int height, int bpp) {
int[] filterType = new int[height];
int[][] blocks = new int[height][width * bpp];
int dataIndex = 0;
for (int i = 0; i < height; i++) {
filterType[i] = (int)(data[dataIndex++]) & 0xFF;
for (int j = 0; j < width * bpp; j++) {
blocks[i][j] = (int)(data[dataIndex++]) & 0xFF;
}
}
for (int i = 0; i < height; i++) {
for (int j = 0; j < width * bpp; j++) {
int prior = (i == 0) ? 0 : blocks[i - 1][j];
int rawBpp = (j < bpp) ? 0 : blocks[i][j - bpp];
int bppPrior = (i == 0 || j < bpp) ? 0 : blocks[i - 1][j - bpp];
switch (filterType[i]) {
case 0: // none
break;
case 1: // sub
blocks[i][j] = blocks[i][j] + rawBpp;
break;
case 2: // up
blocks[i][j] = blocks[i][j] + prior;
break;
case 3: //average
blocks[i][j] = blocks[i][j] + (rawBpp + prior) / 2;
break;
case 4: // paeth
blocks[i][j] = blocks[i][j] + paethPredictor(rawBpp, prior, bppPrior);
break;
default:
}
blocks[i][j] &= 0xff;
}
}
private static int paethPredictor(int a, int b, int c) {
int p = a + b - c;
int pa = Math.abs(p - a), pb = Math.abs(p - b), pc = Math.abs(p - c);
if (pa <= pb && pa <= pc)
return a;
if (pb <= pc)
return b;
return c;
}
byte[][] result = new byte[height][width * bpp];
for (int i = 0; i < height; i++) {
for (int j = 0; j < width * bpp; j++) {
result[i][j] = (byte) blocks[i][j];
}
}
return result;
}
// apply reverse Filter Algorithms to byte data
// bpp = 3
public static byte[][] apply(byte[] data, int width, int height, int bpp) {
int[] filterType = new int[height];
int[][] blocks = new int[height][width * bpp];
int dataIndex = 0;
for (int i = 0; i < height; i++) {
filterType[i] = (int) (data[dataIndex++]) & 0xFF;
for (int j = 0; j < width * bpp; j++) {
blocks[i][j] = (int) (data[dataIndex++]) & 0xFF;
}
}
for (int i = 0; i < height; i++) {
for (int j = 0; j < width * bpp; j++) {
int prior = (i == 0) ? 0 : blocks[i - 1][j];
int rawBpp = (j < bpp) ? 0 : blocks[i][j - bpp];
int bppPrior = (i == 0 || j < bpp) ? 0 : blocks[i - 1][j - bpp];
switch (filterType[i]) {
case 0: // none
break;
case 1: // sub
blocks[i][j] = blocks[i][j] + rawBpp;
break;
case 2: // up
blocks[i][j] = blocks[i][j] + prior;
break;
case 3: // average
blocks[i][j] = blocks[i][j] + (rawBpp + prior) / 2;
break;
case 4: // paeth
blocks[i][j] = blocks[i][j] + paethPredictor(rawBpp, prior, bppPrior);
break;
default:
}
blocks[i][j] &= 0xff;
}
}
byte[][] result = new byte[height][width * bpp];
for (int i = 0; i < height; i++) {
for (int j = 0; j < width * bpp; j++) {
result[i][j] = (byte) blocks[i][j];
}
}
return result;
}
}

2
src/main/java/net/lax1dude/eaglercraft/EaglerImage.java
View File

@ -39,7 +39,7 @@ public class EaglerImage {
public static final EaglerImage loadImage(byte[] file) {
try {
PNG p = (new Decoder(new ByteArrayInputStream(file))).readInPNG();
return new EaglerImage(p.getColor(), (int)p.getWidth(), (int)p.getHeight(), p.ihdr.getBpp() == 4);
return new EaglerImage(p.getColor(), (int)p.getWidth(), (int)p.getHeight(), p.isAlpha());
} catch (IOException e) {
e.printStackTrace();
return null;