org.monte.media.pbm.PBMDecoder Maven / Gradle / Ivy
/*
* @(#)PBMDecoder.java 1.6 2010-08-02
*
* Copyright (c) 2005-2010 Werner Randelshofer, Goldau, Switzerland.
* All rights reserved.
*
* You may not use, copy or modify this file, except in compliance with the
* license agreement you entered into with Werner Randelshofer.
* For details see accompanying license terms.
*/
package org.monte.media.pbm;
import org.monte.media.AbortException;
import org.monte.media.ParseException;
import org.monte.media.iff.*;
import org.monte.media.ilbm.CRNGColorCycle;
import org.monte.media.ilbm.ColorCycle;
import org.monte.media.ilbm.DRNGColorCycle;
import org.monte.media.ilbm.ColorCyclingMemoryImageSource;
import java.io.*;
import java.util.*;
import java.awt.image.*;
import java.net.URL;
/**
* Creates Image objects by reading an IFF PBM stream.
*
* PBM regular expression
*
* PBM ::= "FORM" #{ "PBM" BMHD [CMAP] [GRAB] [DEST] [SPRT] [CAMG] CRNG* CCRT* [BODY] }
*
* BMHD ::= "BMHD" #{ BitMapHeader }
* CMAP ::= "CMAP" #{ (red green blue)* } [0]
* GRAB ::= "GRAB" #{ Point2D }
* DEST ::= "DEST" #{ DestMerge }
* SPRT ::= "SPRT" #{ SpritePrecedence }
* CAMG ::= "CAMG" #{ LONG }
*
* CRNG ::= "CRNG" #{ CRange }
* CCRT ::= "CCRT" #{ CycleInfo }
* BODY ::= "BODY" #{ UBYTE* } [0]
* The token "#" represents a
* ckSize LONG count of the following braced data bytes. E.g., a
* BMHD's "#" should equal
* sizeof(BitMapHeader). Literal strings are shown in "quotes",
* [square bracket items] are optional, and "*" means 0 or more repetitions. A
* sometimes-needed pad byte is shown as "[0]".
*
* @author Werner Randelshofer, Hausmatt 10, CH-6405 Goldau, Switzerland
* @version 1.6 2010-08-02 Added support for CRNG and DRNG chunks.
1.5.1
* 2010-07-03 Improved performance of byterun1 decoder.
1.0 2005-04-05
* Created.
*/
public class PBMDecoder implements IFFVisitor {
/* ---- constants ---- */
/**
* Chunk ID's.
*/
protected final static int PBM_ID = IFFParser.stringToID("PBM ");
protected final static int BMHD_ID = IFFParser.stringToID("BMHD");
protected final static int CMAP_ID = IFFParser.stringToID("CMAP");
protected final static int CRNG_ID = IFFParser.stringToID("CRNG");
protected final static int DRNG_ID = IFFParser.stringToID("DRNG");
protected final static int BODY_ID = IFFParser.stringToID("BODY");
private final static int AUTH_ID = IFFParser.stringToID("AUTH");
private final static int ANNO_ID = IFFParser.stringToID("ANNO");
private final static int COPYRIGHT_ID = IFFParser.stringToID("(c) ");
/**
* PBM BMHD chunk: masking technique.
*/
protected final static int MSK_NONE = 0,
MSK_HAS_MASK = 1,
MSK_HAS_TRANSPARENT_COLOR = 2,
MSK_LASSO = 3;
/**
* PBM BMHD chunk: compression algorithm.
*/
protected final static int CMP_NONE = 0,
CMP_BYTE_RUN_1 = 1;
/* ---- instance variables ---- */
/**
* Input stream to decode from.
*/
protected InputStream inputStream;
/**
* URL to get the input stream from.
*/
protected URL location;
/**
* Stores all the PBM pictures found during decoding as an instance of
* MemoryImageSource.
*/
protected ArrayList sources;
/**
* Properties.
*/
protected Hashtable properties;
/**
* BMHD data.
*/
/**
* Raster width_ and heigth in pixels
*/
protected int bmhdWidth, bmhdHeight;
/**
* pixel position for this image
*/
protected int bmhdXPosition, bmhdYPosition;
/**
* Number of source bitplanes.
*/
protected int bmhdNbPlanes;
protected int bmhdMasking;
protected int bmhdCompression;
/**
* Transparent "color number" (sort of).
*/
protected int bmhdTransparentColor;
/**
* Pixel aspect, a ratio width : height
*/
protected int bmhdXAspect, bmhdYAspect;
/**
* Source "page" size in pixels.
*/
protected int bmhdPageWidth, bmhdPageHeight;
/**
* CMAP data.
*/
protected ColorModel cmapColorModel;
/**
* BODY data
*/
protected ColorCyclingMemoryImageSource memoryImageSource;
/**
* Constructors
*/
public PBMDecoder(InputStream in) {
inputStream = in;
}
public PBMDecoder(URL location) {
this.location = location;
}
/**
* Processes the input stream and creates a vector of MemoryImageSource
* instances.
*
* @return A vector of java.awt.img.MemoryImageSource.
*/
public ArrayList produce()
throws IOException {
InputStream in = null;
sources = new ArrayList();
boolean mustCloseStream;
if (inputStream != null) {
in = inputStream;
mustCloseStream = false;
} else {
in = location.openStream();
mustCloseStream = true;
}
try {
IFFParser iff = new IFFParser();
registerChunks(iff);
iff.parse(in, this);
} catch (ParseException e1) {
e1.printStackTrace();//System.out.println(e1);
} catch (AbortException e) {
e.printStackTrace();//System.out.println(e);
} finally {
if (mustCloseStream) {
in.close();
}
}
return sources;
}
public void registerChunks(IFFParser iff) {
iff.declareGroupChunk(PBM_ID, IFFParser.ID_FORM);
iff.declarePropertyChunk(PBM_ID, BMHD_ID);
iff.declarePropertyChunk(PBM_ID, CMAP_ID);
iff.declareDataChunk(PBM_ID, BODY_ID);
iff.declareCollectionChunk(PBM_ID, ANNO_ID);
iff.declareCollectionChunk(PBM_ID, COPYRIGHT_ID);
iff.declareCollectionChunk(PBM_ID, AUTH_ID);
iff.declareCollectionChunk(PBM_ID, CRNG_ID);
iff.declareCollectionChunk(PBM_ID, DRNG_ID);
}
@Override
public void enterGroup(IFFChunk chunk) {
}
@Override
public void leaveGroup(IFFChunk chunk) {
}
@Override
@SuppressWarnings("unchecked")
public void visitChunk(IFFChunk group, IFFChunk chunk)
throws ParseException, AbortException {
decodeBMHD(group.getPropertyChunk(BMHD_ID));
decodeCMAP(group.getPropertyChunk(CMAP_ID));
decodeBODY(chunk);
double aspect = (double) bmhdXAspect / (double) bmhdYAspect;
if (bmhdXAspect == 0 || bmhdYAspect == 0) {
aspect = 1d;
}
Hashtable props = memoryImageSource.getProperties();
props.put("aspect", new Double(aspect));
String s = "Indexed Colors";
props.put("screenMode", s);
props.put("nbPlanes", "" + bmhdNbPlanes + (((bmhdMasking & MSK_HAS_MASK) != 0) ? "+mask" : ""));
StringBuffer comment = new StringBuffer();
IFFChunk[] chunks = group.getCollectionChunks(ANNO_ID);
for (int i = 0; i < chunks.length; i++) {
if (comment.length() > 0) {
comment.append('\n');
}
comment.append(new String(chunks[i].getData()));
}
chunks = group.getCollectionChunks(AUTH_ID);
for (int i = 0; i < chunks.length; i++) {
if (comment.length() > 0) {
comment.append('\n');
}
comment.append("Author: ");
comment.append(new String(chunks[i].getData()));
}
chunks = group.getCollectionChunks(COPYRIGHT_ID);
for (int i = 0; i < chunks.length; i++) {
if (comment.length() > 0) {
comment.append('\n');
}
comment.append("© ");
comment.append(new String(chunks[i].getData()));
}
if (comment.length() > 0) {
props.put("comment", comment.toString());
}
// Process CRNG and DRNG chunks in the sequence of their
// location in the file.
IFFChunk[] crngChunks = group.getCollectionChunks(CRNG_ID);
IFFChunk[] drngChunks = group.getCollectionChunks(DRNG_ID);
int activeCycles = 0;
int j = 0, k = 0;
for (int i = 0, n = crngChunks.length + drngChunks.length; i < n; i++) {
if (j < crngChunks.length && (k >= drngChunks.length || crngChunks[j].getScan() < drngChunks[k].getScan())) {
// System.out.println("ILBMDecoder decoding CRNG@"+crngChunks[j].getScan());
ColorCycle cc = decodeCRNG(crngChunks[j]);
memoryImageSource.addColorCycle(cc);
if (cc.isActive()) {
activeCycles++;
}
j++;
} else {
// System.out.println("ILBMDecoder decoding DRNG@"+drngChunks[k].getScan());
ColorCycle cc = decodeDRNG(drngChunks[k]);
memoryImageSource.addColorCycle(cc);
if (cc.isActive()) {
activeCycles++;
}
k++;
}
}
if (activeCycles > 0) {
memoryImageSource.setAnimated(true);
props.put("colorCycling", activeCycles);
}
//memoryImageSource.putProperties(props);
sources.add(memoryImageSource);
}
/**
* Decodes the bitmap header (PBM BMHD).
*
*
* typedef UBYTE Masking; // Choice of masking technique
*
* #define mskNone 0
* #define mskHasMask 1
* #define mskHasTransparentColor 2
* #define mskLasso 3
*
* typedef UBYTE Compression; // Choice of compression algorithm
* // applied to the rows of all source and mask planes.
* // "cmpByteRun1" is the byte run encoding. Do not compress
* // accross rows!
* #define cmpNone 0
* #define cmpByteRun1 1
*
* typedef struct {
* UWORD w, h; // raster width & height in pixels
* WORD x, y; // pixel position for this image
* UBYTE nbPlanes; // # source bitplanes
* Masking masking;
* Compression compression;
* UBYTE pad1; // unused; ignore on read, write as 0
* UWORD transparentColor; // transparent "color number" (sort of)
* UBYTE xAspect, yAspect; // pixel aspect, a ratio width : height
* WORD pageWidth, pageHeight; // source "page" size in pixels
* } BitmapHeader;
*
*/
protected void decodeBMHD(IFFChunk chunk)
throws ParseException {
if (chunk == null) {
throw new ParseException("no BMHD -> no Picture");
}
try {
MC68000InputStream in = new MC68000InputStream(new ByteArrayInputStream(chunk.getData()));
bmhdWidth = in.readUWORD();
bmhdHeight = in.readUWORD();
bmhdXPosition = in.readWORD();
bmhdYPosition = in.readWORD();
bmhdNbPlanes = in.readUBYTE();
bmhdMasking = in.readUBYTE();
bmhdCompression = in.readUBYTE();
in.skip(1);
bmhdTransparentColor = in.readUWORD();
bmhdXAspect = in.readUBYTE();
bmhdYAspect = in.readUBYTE();
bmhdPageWidth = in.readWORD();
bmhdPageHeight = in.readWORD();
in.close();
} catch (IOException e) {
throw new ParseException(e.toString());
}
}
protected void decodeCMAP(IFFChunk chunk)
throws ParseException {
byte[] red;
byte[] green;
byte[] blue;
byte[] alpha;
int size = 0;
int colorsToRead = 0;
size = ((bmhdMasking & MSK_HAS_MASK) != 0) ? 2 << bmhdNbPlanes : 1 << bmhdNbPlanes;
colorsToRead = Math.min(size, (int) chunk.getSize() / 3);
red = new byte[size];
green = new byte[size];
blue = new byte[size];
byte[] data = chunk.getData();
int j = 0;
for (int i = 0; i < colorsToRead; i++) {
red[i] = data[j++];
green[i] = data[j++];
blue[i] = data[j++];
}
int transparentColorIndex = ((bmhdMasking & MSK_HAS_TRANSPARENT_COLOR) != 0) ? bmhdTransparentColor : -1;
if ((bmhdMasking & MSK_HAS_MASK) != 0) {
System.arraycopy(red, 0, red, red.length / 2, red.length / 2);
System.arraycopy(green, 0, green, green.length / 2, green.length / 2);
System.arraycopy(blue, 0, blue, blue.length / 2, blue.length / 2);
alpha = new byte[red.length];
for (int i = 0, n = red.length / 2; i < n; i++) {
alpha[i] = (byte) 0xff;
}
cmapColorModel = new IndexColorModel(8, red.length, red, green, blue, alpha);
} else {
cmapColorModel = new IndexColorModel(8, red.length, red, green, blue, transparentColorIndex);
}
}
/**
* Decodes the color range cycling (ILBM CRNG).
*
*
* #define RNG_NORATE 36 // Dpaint uses this rate to mean non-active
* set {
* active = 1, reverse = 2
* } crngActive;
*
* // A CRange is store in a CRNG chunk.
* typedef struct {
* WORD pad1; // reserved for future use; store 0 here *
* WORD rate; // 60/sec=16384, 30/sec=8192, 1/sec=16384/60=273
* WORD set crngActive flags; // bit0 set = active, bit 1 set = reverse
* UBYTE low; UBYTE high; // lower and upper color registers selected
* } ilbmColorRegisterRangeChunk;
*
*/
protected ColorCycle decodeCRNG(IFFChunk chunk)
throws ParseException {
ColorCycle cc;
try {
MC68000InputStream in = new MC68000InputStream(new ByteArrayInputStream(chunk.getData()));
int pad1 = in.readUWORD();
int rate = in.readUWORD();
int flags = in.readUWORD();
int low = in.readUBYTE();
int high = in.readUBYTE();
//System.out.println("CRNG pad1:"+pad1+" rate:"+rate+" flags:"+flags+" low:"+low+" high:"+high);
cc = new CRNGColorCycle(rate, 273, low, high,//
(flags & 1) != 0 && rate > 36 && high > low, //
(flags & 2) != 0, false);
in.close();
} catch (IOException e) {
throw new ParseException(e.toString());
}
return cc;
}
/**
* Decodes the DPaint IV enhanced color cycle chunk (ILBM DRNG) The
* RNG_ACTIVE flag is set when the range is cyclable. A range should only
* have the RNG _ACTIVE if it:
- contains at least one color
* register
- has a defined rate
- has more than one color
* and/or color register
*
* ILBM DRNG DPaint IV enhanced color cycle chunk
* --------------------------------------------
*
* set {
* RNG_ACTIVE=1,RNG_DP_RESERVED=4
* } drngFlags;
*
* /* True color cell * /
* typedef struct {
* UBYTE cell;
* UBYTE r;
* UBYTE g;
* UBYTE b;
* } ilbmDRNGDColor;
*
* /* Color register cell * /
* typedef struct {
* UBYTE cell;
* UBYTE index;
* } ilbmDRNGDIndex;
*
* /* DRNG chunk. * /
* typedef struct {
* UBYTE min; /* min cell value * /
* UBYTE max; /* max cell value * /
* UWORD rate; /* color cycling rate, 16384 = 60 steps/second * /
* UWORD set drngFlags flags; /* 1=RNG_ACTIVE, 4=RNG_DP_RESERVED * /
* UBYTE ntrue; /* number of DColorCell structs to follow * /
* UBYTE ntregs; /* number of DIndexCell structs to follow * /
* ilbmDRNGDColor[ntrue] trueColorCells;
* ilbmDRNGDIndex[ntregs] colorRegisterCells;
* } ilbmDRangeChunk;
*
*/
protected ColorCycle decodeDRNG(IFFChunk chunk)
throws ParseException {
ColorCycle cc;
try {
MC68000InputStream in = new MC68000InputStream(new ByteArrayInputStream(chunk.getData()));
int min = in.readUBYTE();
int max = in.readUBYTE();
int rate = in.readUWORD();
int flags = in.readUWORD();
int ntrue = in.readUBYTE();
int nregs = in.readUBYTE();
DRNGColorCycle.Cell[] cells = new DRNGColorCycle.Cell[ntrue + nregs];
for (int i = 0; i < ntrue; i++) {
int cell = in.readUBYTE();
int rgb = (in.readUBYTE() << 16) | (in.readUBYTE() << 8) | in.readUBYTE();
cells[i] = new DRNGColorCycle.DColorCell(cell, rgb);
}
for (int i = 0; i < nregs; i++) {
int cell = in.readUBYTE();
int index = in.readUBYTE();
cells[i + ntrue] = new DRNGColorCycle.DIndexCell(cell, index);
}
//System.out.println("DRNG min:"+min+" max:"+max+" rate:"+rate+" flags:"+flags+" ntrue:"+ntrue+" nregs:"+nregs);
cc = new DRNGColorCycle(rate, 273, min, max, //
(flags & 1) != 0 && rate > 36 && min <= max && ntrue + nregs > 1,//
false, cells);
in.close();
} catch (IOException e) {
throw new ParseException(e.toString());
}
return cc;
}
protected void decodeBODY(IFFChunk chunk)
throws ParseException {
int pixmapWidth = (bmhdWidth % 2 == 1) ? bmhdWidth + 1 : bmhdWidth;
byte[] pixels = new byte[pixmapWidth * bmhdHeight];
byte[] data = chunk.getData();
switch (bmhdCompression) {
case CMP_NONE:
System.arraycopy(data, 0, pixels, 0, data.length);
break;
case CMP_BYTE_RUN_1:
unpackByteRun1(data, pixels);
break;
default:
throw new ParseException("unknown compression method: " + bmhdCompression);
}
Hashtable props = new Hashtable();
if ((bmhdMasking & MSK_HAS_MASK) != 0) {
// XXX - Handle image creation with mask
System.out.println("PBMDecoder Images with Mask not supported");
memoryImageSource = new ColorCyclingMemoryImageSource(bmhdWidth, bmhdHeight, cmapColorModel, pixels, 0, pixmapWidth, props);
} else {
memoryImageSource = new ColorCyclingMemoryImageSource(bmhdWidth, bmhdHeight, cmapColorModel, pixels, 0, pixmapWidth, props);
}
}
/**
* ByteRun1 run decoder. The run encoding scheme by byteRun1 is
* best described by pseudo code for the decoder Unpacker (called
* UnPackBits in the Macintosh toolbox.
*
* UnPacker:
* LOOP until produced the desired number of bytes
* Read the next source byte into n
* SELECT n FROM
* [0..127] => copy the next n+1 bytes literally
* [-1..-127] => replicate the next byte -n+1 times
* -128 => no operation
* ENDCASE;
* ENDLOOP;
*
*
* @param in
* @param out
* @throws ParseException
*/
public static int unpackByteRun1(byte[] in, byte[] out)
throws ParseException {
try {
return MC68000InputStream.unpackByteRun1(in, out);
} catch (IOException ex) {
ParseException e = new ParseException("couldn't decompress body");
e.initCause(ex);
throw e;
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy