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A library for processing Amiga and Atari still images, video, audio and meta-data.
The newest version!
/*
* @(#)Main.java
* Copyright © 2023 Werner Randelshofer, Switzerland. MIT License.
*/
package org.monte.media.ilbm;
import org.monte.media.amigabitmap.AmigaBitmapImage;
import org.monte.media.amigabitmap.AmigaHAMColorModel;
import org.monte.media.exception.AbortException;
import org.monte.media.exception.ParseException;
import org.monte.media.iff.IFFChunk;
import org.monte.media.iff.IFFParser;
import org.monte.media.iff.IFFVisitor;
import org.monte.media.iff.MC68000InputStream;
import java.awt.image.ColorModel;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Hashtable;
/**
* Creates Image objects by reading an IFF ILBM stream.
*
* ILBM regular expression
*
* ILBM ::= "FORM" #{ "ILBM" BMHD [CMAP] [GRAB] [DEST] [SPRT] [CAMG] CRNG* CCRT* DRNG* [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 }
* DRNG ::= "DRNG" #{ DRange }
* 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
*/
public class ILBMDecoder
implements IFFVisitor {
/* ---- constants ---- */
/**
* Chunk ID's.
*/
protected final static int ILBM_ID = IFFParser.stringToID("ILBM");
protected final static int BMHD_ID = IFFParser.stringToID("BMHD");
protected final static int CMAP_ID = IFFParser.stringToID("CMAP");
protected final static int CAMG_ID = IFFParser.stringToID("CAMG");
protected final static int CCRT_ID = IFFParser.stringToID("CCRT");
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");
protected final static int VDAT_ID = IFFParser.stringToID("VDAT");
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) ");
/** ILBM CAMG chunk: Commodore Amiga Video display modes. */
/**
* ILBM CAMG chunk: Mask and ID bits for CAMG ModeID.
*/
protected final static int MONITOR_ID_MASK = 0xffff1000;
protected final static int DEFAULT_MONITOR_ID = 0x00000000;
protected final static int NTSC_MONITOR_ID = 0x00011000;
protected final static int PAL_MONITOR_ID = 0x00021000;
protected final static int VGA_MONITOR_ID = 0x00031000;
protected final static int A2024_MONITOR_ID = 0x00041000;
protected final static int PROTO_MONITOR_ID = 0x00051000;
protected final static int EURO72_MONITOR_ID = 0x00061000;
protected final static int EURO36_MONITOR_ID = 0x00071000;
protected final static int SUPER72_MONITOR_ID = 0x00081000;
protected final static int DBLNTSC_MONITOR_ID = 0x00091000;
protected final static int DBLPAL_MONITOR_ID = 0x00001000;
protected final static int MODE_INDEXED_COLORS = 0,
MODE_DIRECT_COLORS = 1,
MODE_EHB = 2,
MODE_HAM6 = 3,
MODE_HAM8 = 4;
protected final static int HAM_MASK = 0x00000800;
protected final static int EHB_MASK = 0x00000080;
protected final static int HAM_KEY = 0x00000800;
protected final static int EXTRAHALFBRITE_KEY = 0x00000080;
/**
* ILBM BMHD chunk: masking technique.
*/
protected final static int MSK_NONE = 0,
MSK_HAS_MASK = 1,
MSK_HAS_TRANSPARENT_COLOR = 2,
MSK_LASSO = 3;
/**
* ILBM BMHD chunk: compression algorithm.
*/
protected final static int CMP_NONE = 0,
CMP_BYTE_RUN_1 = 1, CMP_VERTICAL = 2;
/* ---- instance variables ---- */
/**
* Input stream to decode from.
*/
protected InputStream inputStream;
/**
* URL to get the input stream from.
*/
protected URL location;
/**
* Stores all the ILBM pictures found during decoding
* as an instance of ColorCyclingMemoryImageSource.
*/
protected ArrayList sources;
protected ArrayList bitmapSources;
/** BMHD data. */
/**
* Raster width and height 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;
/**
* Commodore Amiga Graphics Mode.
*/
protected int camg = NTSC_MONITOR_ID;
/**
* CAMG Video display mode.
*/
protected int camgMode;
/**
* CMAP data.
*/
protected ColorModel cmapColorModel;
/**
* BODY data
*/
protected AmigaBitmapImage bodyBitmap;
/**
* Constructors
*/
public ILBMDecoder(InputStream in) {
inputStream = in;
}
public ILBMDecoder(URL location) {
this.location = location;
}
/**
* Processes the input stream and creates a vector of
* ColorCyclingMemoryImageSource instances.
*
* @return A vector of java.awt.img.ColorCyclingMemoryImageSource.
*/
public ArrayList produce()
throws IOException {
InputStream in = null;
sources = new ArrayList();
bitmapSources = null;
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();
} catch (AbortException e) {
e.printStackTrace();
} finally {
if (mustCloseStream) {
in.close();
}
}
return sources;
}
/**
* Processes the input stream and creates a vector of
* BitmapImages instances.
*
* @return A vector of java.awt.img.ColorCyclingMemoryImageSource.
*/
public ArrayList produceBitmaps()
throws IOException {
InputStream in = null;
sources = null;
bitmapSources = 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();
} catch (AbortException e) {
e.printStackTrace();
} finally {
if (mustCloseStream) {
in.close();
}
}
return bitmapSources;
}
public void registerChunks(IFFParser iff) {
iff.declareGroupChunk(ILBM_ID, IFFParser.ID_FORM);
iff.declarePropertyChunk(ILBM_ID, BMHD_ID);
iff.declarePropertyChunk(ILBM_ID, CMAP_ID);
iff.declarePropertyChunk(ILBM_ID, CAMG_ID);
iff.declareDataChunk(ILBM_ID, BODY_ID);
iff.declareCollectionChunk(ILBM_ID, ANNO_ID);
iff.declareCollectionChunk(ILBM_ID, COPYRIGHT_ID);
iff.declareCollectionChunk(ILBM_ID, AUTH_ID);
iff.declareCollectionChunk(ILBM_ID, CRNG_ID);
iff.declareCollectionChunk(ILBM_ID, DRNG_ID);
iff.declareCollectionChunk(ILBM_ID, CCRT_ID);
}
@Override
public void enterGroup(IFFChunk chunk) {
}
@Override
public void leaveGroup(IFFChunk chunk) {
}
@Override
public void visitChunk(IFFChunk group, IFFChunk chunk)
throws ParseException, AbortException {
decodeBMHD(group.getPropertyChunk(BMHD_ID));
decodeCAMG(group.getPropertyChunk(CAMG_ID));
boolean is4BitsPerChannel = (camg & MONITOR_ID_MASK) == DEFAULT_MONITOR_ID;
decodeCMAP(group.getPropertyChunk(CMAP_ID), is4BitsPerChannel);
decodeBODY(chunk);
Hashtable props = new Hashtable();
double aspect = (double) bmhdXAspect / (double) bmhdYAspect;
if (bmhdXAspect == 0 || bmhdYAspect == 0) {
aspect = 1d;
}
props.put("aspect", new Double(aspect));
String s;
switch (camgMode) {
case MODE_INDEXED_COLORS:
s = "Indexed Colors";
break;
case MODE_DIRECT_COLORS:
s = "Direct Colors";
break;
case MODE_EHB:
s = "EHB";
break;
case MODE_HAM6:
s = "HAM 6";
break;
case MODE_HAM8:
s = "HAM 8";
break;
default:
s = "unknown";
break;
}
props.put("screenMode", s);
props.put("nbPlanes", "" + bmhdNbPlanes + (((bmhdMasking & MSK_HAS_MASK) != 0) ? "+mask" : ""));
props.put("CAMG", new Integer(camg));
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());
}
bodyBitmap.setEnforceDirectColors(false);
if (sources != null) {
ColorCyclingMemoryImageSource mis;
if (bodyBitmap.convertToChunky() == AmigaBitmapImage.BYTE_PIXEL) {
mis = new ColorCyclingMemoryImageSource(
bmhdWidth, bmhdHeight,
cmapColorModel,
bodyBitmap.getBytePixels(), 0, bmhdWidth,
props);
} else {
mis = new ColorCyclingMemoryImageSource(
bmhdWidth, bmhdHeight,
bodyBitmap.getChunkyColorModel(),
bodyBitmap.getIntPixels(), 0, bmhdWidth,
props);
}
// Process CCRT, CRNG and DRNG chunks in the sequence of their
// location in the file.
IFFChunk[] ccrtChunks = group.getCollectionChunks(CCRT_ID);
IFFChunk[] crngChunks = group.getCollectionChunks(CRNG_ID);
IFFChunk[] drngChunks = group.getCollectionChunks(DRNG_ID);
int activeCycles = 0;
int j = 0, k = 0, l = 0;
for (int i = 0, n = ccrtChunks.length + crngChunks.length + drngChunks.length; i < n; i++) {
if (j < crngChunks.length //
&& (k >= drngChunks.length || crngChunks[j].getScan() < drngChunks[k].getScan()) //
&& (l >= ccrtChunks.length || crngChunks[j].getScan() < ccrtChunks[l].getScan())) {
ColorCycle cc = decodeCRNG(crngChunks[j]);
if (cc != null) {
mis.addColorCycle(cc);
if (cc.isActive()) {
activeCycles++;
}
}
j++;
} else if (k < drngChunks.length //
&& (l >= ccrtChunks.length || drngChunks[k].getScan() < ccrtChunks[l].getScan())) {
ColorCycle cc = decodeDRNG(drngChunks[k]);
if (cc != null) {
mis.addColorCycle(cc);
if (cc.isActive()) {
activeCycles++;
}
}
k++;
} else {
ColorCycle cc = decodeCCRT(ccrtChunks[l]);
if (cc != null) {
mis.addColorCycle(cc);
if (cc.isActive()) {
activeCycles++;
}
}
l++;
}
}
if (activeCycles > 0) {
mis.setAnimated(true);
props.put("colorCycling", activeCycles);
}
sources.add(mis);
}
if (bitmapSources != null) {
bitmapSources.add(bodyBitmap.clone());
}
}
// /**
// * Decodes the bitmap header (ILBM 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());
}
}
/**
* Decodes the CAMG Chunk.
* Requires data from BMHD Chunk.
*/
protected void decodeCAMG(IFFChunk chunk)
throws ParseException {
camg = 0;
if (chunk != null) {
try {
MC68000InputStream in = new MC68000InputStream(new ByteArrayInputStream(chunk.getData()));
camg = in.readLONG();
in.close();
} catch (IOException e) {
throw new ParseException(e.toString());
}
}
// Extract color mode bits
switch (camg & (HAM_MASK | EHB_MASK)) {
case EXTRAHALFBRITE_KEY:
camgMode = MODE_EHB;
break;
case HAM_KEY:
if (bmhdNbPlanes == 6) {
camgMode = MODE_HAM6;
} else {
if (bmhdNbPlanes == 8) {
camgMode = MODE_HAM8;
} else {
throw new ParseException("unsupported Ham Mode with " + bmhdNbPlanes + " bitplanes");
}
}
break;
default:
if (bmhdNbPlanes <= 8) {
camgMode = MODE_INDEXED_COLORS;
} else {
camgMode = MODE_DIRECT_COLORS;
}
}
}
protected void decodeCMAP(IFFChunk chunk, boolean is4BitsPerChannel)
throws ParseException {
byte[] red;
byte[] green;
byte[] blue;
byte[] alpha;
int size = 0;
int colorsToRead = 0;
if (chunk == null && camgMode != MODE_DIRECT_COLORS) {
if (camgMode == MODE_INDEXED_COLORS) {
size = 1 << bmhdNbPlanes;
red = new byte[size];
green = new byte[size];
blue = new byte[size];
for (int i = 0; i < size; i++) {
red[i] = green[i] = blue[i] = (byte) ((i / (float) (size - 1)) * 255);
}
cmapColorModel = new IndexColorModel(8, size, red, green, blue);
return;
} else {
if (size == 0) {
throw new ParseException("No CMAP, not supported for this CAMG mode.");
}
}
}
switch (camgMode) {
case MODE_EHB:
size = ((bmhdMasking & MSK_HAS_MASK) != 0) ? 128 : 64;
colorsToRead = Math.min(32, (int) chunk.getSize() / 3);
break;
case MODE_HAM6:
case MODE_HAM8:
if ((bmhdMasking & MSK_HAS_MASK) != 0) {
throw new ParseException("Masking for HAM not supported");
}
size = 1 << (bmhdNbPlanes - 2);
colorsToRead = Math.min(size, (int) chunk.getSize() / 3);
break;
case MODE_INDEXED_COLORS:
size = ((bmhdMasking & MSK_HAS_MASK) != 0) ? 2 << bmhdNbPlanes : 1 << bmhdNbPlanes;
colorsToRead = Math.min(size, (int) chunk.getSize() / 3);
break;
case MODE_DIRECT_COLORS:
if (bmhdMasking != MSK_NONE) {
throw new ParseException("Masking for true color not supported");
}
/* MASKING NOT (YET) SUPPORTED
if (bmhdMasking == MSK_HAS_TRANSPARENT_COLOR) {
cmapColorModel = new DirectColorModel(25,0x00ff0000,0x0000ff00,0x000000ff,0x01000000);
} else {
cmapColorModel = new DirectColorModel(24,0x00ff0000,0x0000ff00,0x000000ff);
}*/
cmapColorModel = new DirectColorModel(24, 0x00ff0000, 0x0000ff00, 0x000000ff);
return;
default:
throw new ParseException("Unsupported CAMG mode :" + camgMode);
}
red = new byte[size];
green = new byte[size];
blue = new byte[size];
byte[] data = chunk.getData();
int j = 0;
if (is4BitsPerChannel) {
for (int i = 0; i < colorsToRead; i++) {
red[i] = (byte) (data[j] & 0xf0 | ((data[j] & 0xf0) >>> 4));
green[i] = (byte) (data[j + 1] & 0xf0 | ((data[j + 1] & 0xf0) >>> 4));
blue[i] = (byte) (data[j + 2] & 0xf0 | ((data[j + 2] & 0xf0) >>> 4));
j += 3;
}
} else {
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;
switch (camgMode) {
case MODE_EHB:
j = 32;
for (int i = 0; i < 32; i++, j++) {
red[j] = (byte) ((red[i] & 255) / 2);
green[j] = (byte) ((green[i] & 255) / 2);
blue[j] = (byte) ((blue[i] & 255) / 2);
}
if ((bmhdMasking & MSK_HAS_MASK) != 0) {
System.arraycopy(red, 0, red, 64, 64);
System.arraycopy(green, 0, green, 64, 64);
System.arraycopy(green, 0, green, 64, 64);
alpha = new byte[128];
for (int i = 0; i < 64; i++) {
alpha[i] = (byte) 0xff;
}
cmapColorModel = new IndexColorModel(8, 64, red, green, blue, alpha);
} else {
cmapColorModel = new IndexColorModel(8, 64, red, green, blue, transparentColorIndex);
}
break;
case MODE_HAM6:
cmapColorModel = new AmigaHAMColorModel(AmigaHAMColorModel.HAM6, 16, red, green, blue, false);
break;
case MODE_HAM8:
cmapColorModel = new AmigaHAMColorModel(AmigaHAMColorModel.HAM8, 64, red, green, blue, false);
break;
case MODE_INDEXED_COLORS:
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);
}
break;
}
}
/**
* Decodes the color cycling range and timing chunk (ILBM CCRT).
*
*
* enum {
* dontCycle = 0, forward = 1, backwards = -1
* } ccrtDirection;
* typedef struct {
* WORD enum ccrtDirection direction; // 0=don't cycle, 1=forward, -1=backwards
* UBYTE start; // range lower
* UBYTE end; // range upper
* ULONG seconds; // seconds between cycling
* ULONG microseconds; // msecs between cycling
* WORD pad; // future exp - store 0 here
* } ilbmColorCyclingRangeAndTimingChunk;
*
*/
protected ColorCycle decodeCCRT(IFFChunk chunk)
throws ParseException {
ColorCycle cc;
try {
MC68000InputStream in = new MC68000InputStream(new ByteArrayInputStream(chunk.getData()));
int direction = in.readWORD();
int start = in.readUBYTE();
int end = in.readUBYTE();
long seconds = in.readULONG();
long microseconds = in.readULONG();
int pad = in.readWORD();
cc = new CRNGColorCycle(1000000 / (int) (seconds * 1000 + microseconds / 1000), 1000, start, end,//
direction == 1 || direction == -1, //
direction == 1, camgMode == MODE_EHB);
in.close();
} catch (IOException e) {
throw new ParseException(e.toString());
}
return cc;
}
/**
* 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();
cc = new CRNGColorCycle(rate, 273, low, high,//
(flags & 1) != 0 && rate > 36 && high > low, //
(flags & 2) != 0, camgMode == MODE_EHB);
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);
}
cc = new DRNGColorCycle(rate, 273, min, max, //
(flags & 1) != 0 && rate > 36 && min <= max && ntrue + nregs > 1,//
camgMode == MODE_EHB, cells);
in.close();
} catch (IOException e) {
throw new ParseException(e.toString());
}
return cc;
}
protected void decodeBODY(IFFChunk chunk)
throws ParseException {
if ((bmhdMasking & MSK_HAS_MASK) != 0) {
bodyBitmap = new AmigaBitmapImage(bmhdWidth, bmhdHeight, bmhdNbPlanes + 1, cmapColorModel);
} else {
bodyBitmap = new AmigaBitmapImage(bmhdWidth, bmhdHeight, bmhdNbPlanes, cmapColorModel);
}
byte[] data = chunk.getData();
switch (bmhdCompression) {
case CMP_NONE:
System.arraycopy(data, 0, bodyBitmap.getBitmap(), 0, data.length);
break;
case CMP_BYTE_RUN_1:
unpackByteRun1(data, bodyBitmap.getBitmap());
break;
case CMP_VERTICAL:
unpackVertical(data, bodyBitmap);
break;
default:
throw new ParseException("unknown compression method: " + bmhdCompression);
}
}
/**
* 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;
}
}
/**
* Vertical run decoder.
*
* Each plane is stored in a separate VDAT chunk.
*
* A VDAT chunk consists of an id, a length, and a body.
*
* struct {
* uint16 id; // The 4 ASCII characters "VDAT"
* uint16 length,
* byte[length] body
* }
*
* The body consists of a command list and a data list.
*
* struct {
* uint16 cnt; // Command count + 2
* uint8[cnt - 2] cmd; // The commands
* uint16[] data; // Data words
* }
*
* Pseudo code for the unpacker:
*
* UnPacker:
* Read cnt;
* LOOP cnt - 2 TIMES
* Read the next command byte into cmd
* SELECT cmd FROM
* 0 =>
* Read the next data word into n
* Copy the next n data words literally
* 1 =>
* Read the next data word into n
* Replicate the next data word n times
* [2..127] =>
* Replicate the next data word cmd times
* [-1..-128] =>
* Copy the next -cmd data words literally
* ENDCASE;
* IF end of data reached THEN EXIT END;
* ENDLOOP;
*
*/
public void unpackVertical(byte[] in, AmigaBitmapImage bm)
throws ParseException {
byte[] out = bm.getBitmap();
int iIn = 0; // input index
int endOfData = 0;
byte buf[] = new byte[bmhdWidth * bmhdHeight / 8]; // temporary bitplane buffer
int scanlineStride = bm.getScanlineStride();
int columnCount = (bmhdWidth / 8) * bmhdHeight;
int columnStride = bmhdHeight * 2;
try {
for (int p = 0; p < bmhdNbPlanes; p++) {
// Each plane is stored in a separate VDAT chunk.
// ----------------------------------------------
int iBuf = 0;
iIn = endOfData;
// read the "VDAT" chunk id and length
int id = (in[iIn++] & 0xff) << 24 | (in[iIn++] & 0xff) << 16 | (in[iIn++] & 0xff) << 8 | (in[iIn++] & 0xff);
if (id != VDAT_ID) {
throw new ParseException("Illegal VDAT chunk ID:" + IFFParser.idToString(id) + " at " + (iIn - 4));
}
long length = (in[iIn++] & 0xffL) << 24 | (in[iIn++] & 0xffL) << 16 | (in[iIn++] & 0xffL) << 8 | (in[iIn++] & 0xffL);
if (iIn + length > in.length) {
throw new ParseException("Illegal VDAT chunk length:" + length + " at " + (iIn - 4));
}
endOfData += length + 8;
// The body consists of a command list and a data list.
// ----------------------------------------------------
// read the command count, compute the offset to the data list
int cnt = (in[iIn++] & 0xff) << 8 | (in[iIn++] & 0xff);
int iCmd = iIn;
iIn = iIn + cnt - 2;
try {
// Process the commands until all commands read or end of data reached
for (int i = cnt - 2; i > 0 && iIn < endOfData; i--) {
int cmd = in[iCmd++];
if (cmd == 0) {
// 0 => Read the next data word into n
// Copy the next n data words literally
int n = (in[iIn++] & 0xff) << 8 | (in[iIn++] & 0xff);
for (n *= 2; n > 0; n--) {
buf[iBuf++] = in[iIn++];
}
} else if (cmd == 1) {
// 1 => Read the next data word into n
// Replicate the next data word n times
int n = (in[iIn++] & 0xff) << 8 | (in[iIn++] & 0xff);
byte dhigh = in[iIn++]; // high byte
byte dlow = in[iIn++]; // low byte
for (; n > 0; n--) {
buf[iBuf++] = dhigh;
buf[iBuf++] = dlow;
}
} else if (cmd >= 2) {
// [2..127] => Replicate the next data word cmd times
byte dhigh = in[iIn++]; // high byte
byte dlow = in[iIn++]; // low byte
for (int n = cmd; n > 0; n--) {
buf[iBuf++] = dhigh;
buf[iBuf++] = dlow;
}
} else {
// [-1..-128] => Copy the next -cmd data words literally
for (int n = cmd * -2; n > 0; n--) {
buf[iBuf++] = in[iIn++];
}
}
}
} catch (IndexOutOfBoundsException e) {
System.err.println("IndexOutOfBounds in bitplane " + p);
e.printStackTrace();
}
// Copy buffer into bitmap
int bitplaneOffset = bm.getBitplaneStride() * p;
for (int xBuf = 0, xOut = 0; xBuf < columnCount; xBuf += columnStride, xOut += 2) {
for (int yBuf = 0, yOut = bitplaneOffset; yBuf < columnStride; yBuf += 2, yOut += scanlineStride) {
out[xOut + yOut] = buf[xBuf + yBuf];
out[xOut + 1 + yOut] = buf[xBuf + 1 + yBuf];
}
}
}
} catch (IndexOutOfBoundsException e) {
e.printStackTrace();
}
}
/*
/* Normal identifiers. * /
public final static int DEFAULT_MONITOR_ID = 0x00000000;
public final static int NTSC_MONITOR_ID = 0x00011000;
public final static int PAL_MONITOR_ID = 0x00021000;
public final static int LORES_MASK = 0x00000000;
public final static int LACE_MASK = 0x00000004;
public final static int HIRES_MASK = 0x00008000;
public final static int SUPER_MASK = 0x00008020;
public final static int HAM_MASK = 0x00000800;
public final static int DPF_MASK = 0x00000400;
public final static int DPF2_MASK = 0x00000440;
public final static int EHB_MASK = 0x00000080;
/*
The following 20 composite keys are for Modes on the default Monitor.
NTSC & PAL "flavours" of these particular keys may be made by or'ing
the NTSC or PAL MONITOR_ID with the desired MODE_KEY.
* /
public final static int LORES_KEY = 0x00000000; // NTSC:320*200,44x52,50fps PAL:320x256,44x44,60fps
public final static int HIRES_KEY = 0x00008000; // NTSC:640*200,22x52 PAL:640*256,22x44
public final static int SUPER_KEY = 0x00008020; // NTSC:1280*200,11x52 PAL:1280x256,11x44
public final static int HAM_KEY = 0x00000800; // NTSC:320*200,44x52 PAL:320x256,44x44
public final static int LORESLACE_KEY = 0x00000004; // NTSC:320*400,44x26 PAL:320x512,44x22
public final static int HIRESLACE_KEY = 0x00008004; // NTSC:640*400,22x26 PAL:640x512,22x22
public final static int SUPERLACE_KEY = 0x00008024; // NTSC:1280*400,11x26 PAL:1280x512,11x22
public final static int HAMLACE_KEY = 0x00000804; // NTSC:320*400,44x26 PAL:320x512,44x22
public final static int LORESDPF_KEY = 0x00000400; // 320*240,256
public final static int HIRESDPF_KEY = 0x00008400; // 640*240,256
public final static int SUPERDPF_KEY = 0x00008420; // 1280*240,256
public final static int LORESLACEDPF_KEY = 0x00000404; // 320*480,512
public final static int HIRESLACEDPF_KEY = 0x00008404; // 640*480,512
public final static int SUPERLACEDPF_KEY = 0x00008424; // 1280*480,512
public final static int LORESDPF2_KEY = 0x00000440; // 320*240,256
public final static int HIRESDPF2_KEY = 0x00008440; // 640*240,256
public final static int SUPERDPF2_KEY = 0x00008460; // 1280*240,256
public final static int LORESLACEDPF2_KEY = 0x00000444; // 320*480,512
public final static int HIRESLACEDPF2_KEY = 0x00008444; // 640*480,512
public final static int SUPERLACEDPF2_KEY = 0x00008464; // 1280*480,512
public final static int EXTRAHALFBRITE_KEY = 0x00000080; // NTSC:320*200,44x52 PAL:320*256,44x44
public final static int EXTRAHALFBRITELACE_KEY = 0x00000084; // NTSC:320*400,44x26 PAL:320*512,44x22
/* VGA identifiers. * /
public final static int VGA_MONITOR_ID = 0x00031000;
public final static int VGALACE_MASK = 0x00000001;
public final static int VGALORES_MASK = 0x00008000;
public final static int VGAEXTRALORES_KEY = 0x00031004; // 160*480 v 88x22
public final static int VGALORES_KEY = 0x00039004; // 320*480 v 44x22
public final static int VGAPRODUCT_KEY = 0x00039024; // 640*480 v 22x22
public final static int VGAHAM_KEY = 0x00031804; //
public final static int VGAEXTRALORESLACE_KEY = 0x00031005; // 160*960 v 88x11
public final static int VGALORESLACE_KEY = 0x00039005; // 320*960 v 44x11
public final static int VGAPRODUCTLACE_KEY = 0x00039025; // 640*960 v 22x11
public final static int VGAHAMLACE_KEY = 0x00031805; //
public final static int VGAEXTRALORESDPF_KEY = 0x00031404; //
public final static int VGALORESDPF_KEY = 0x00039404;
public final static int VGAPRODUCTDPF_KEY = 0x00039424;
public final static int VGAEXTRALORESLACEDPF_KEY = 0x00031405;
public final static int VGALORESLACEDPF_KEY = 0x00039405;
public final static int VGAPRODUCTLACEDPF_KEY = 0x00039425; //
public final static int VGAEXTRALORESDPF2_KEY = 0x00031444;
public final static int VGALORESDPF2_KEY = 0x00039444;
public final static int VGAPRODUCTDPF2_KEY = 0x00039464;
public final static int VGAEXTRALORESLACEDPF2_KEY = 0x00031445;
public final static int VGALORESLACEDPF2_KEY = 0x00039445;
public final static int VGAPRODUCTLACEDPF2_KEY = 0x00039465; // 640*960
public final static int VGAEXTRAHALFBRITE_KEY = 0x00031084;
public final static int VGAEXTRAHALFBRITELACE_KEY = 0x00031085;
/* A2024 identifiers. * /
public final static int A2024_MONITOR_ID = 0x00041000;
public final static int A2024TENHERTZ_KEY = 0x00041000;
public final static int A2024FIFTEENHERTZ_KEY = 0x00049000;
/* Proto identifiers. * /
public final static int PROTO_MONITOR_ID = 0x00051000;
/* Euro identifiers * /
public final static int EURO36_MONITOR_ID = 0x00071000;
public final static int EURO36EXTRAHALFBRITE_KEY = 0x00071080; // 320*200 v 44x44
public final static int EURO36EXTRAHALFBRITELACE_KEY = 0x00071084; // 320*400 v 44x22
public final static int EURO36HAM_KEY = 0x00071800; // 320*200 v 44x44
public final static int EURO36HAMLACE_KEY = 0x00071804; // 320*400 v 44x22
public final static int EURO36HIRES_KEY = 0x00079000; // 640*200 v 22x44
public final static int EURO36HIRESLACE_KEY = 0x00079004; // 640*400 v 22x22
public final static int EURO36LORES_KEY = 0x00071000; // 320*200 v 44x44
public final static int EURO36LORESLACE_KEY = 0x00071004; // 320*400 v 44x22
public final static int EURO36SUPERHIRES_KEY = 0x00079020; // 1280*200 v 11x44
public final static int EURO36SUPERHIRESLACE_KEY = 0x00079024; // 1280*400 v 11x44
public final static int EURO72ECS_KEY = 0x00069004; // 320*400 v 44x22
public final static int EURO72ECSLACE_KEY = 0x00069005; // 320*800 v 44x11
public final static int EURO72PRODUCT_KEY = 0x00069024; // 640*400 v 22x22
public final static int EURO72PRODUCTLACE_KEY = 0x00069025; // 640*800 v 22x11
public final static int EURO_KEY = 0x00071000;
*/
}
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