--- /dev/null
+//========================================================================
+//
+// JPXStream.h
+//
+// Copyright 2002-2003 Glyph & Cog, LLC
+//
+//========================================================================
+
+#ifndef JPXSTREAM_H
+#define JPXSTREAM_H
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma interface
+#endif
+
+#include "gtypes.h"
+#include "Object.h"
+#include "Stream.h"
+
+class JArithmeticDecoderStats;
+
+//------------------------------------------------------------------------
+
+enum JPXColorSpaceType {
+ jpxCSBiLevel = 0,
+ jpxCSYCbCr1 = 1,
+ jpxCSYCbCr2 = 3,
+ jpxCSYCBCr3 = 4,
+ jpxCSPhotoYCC = 9,
+ jpxCSCMY = 11,
+ jpxCSCMYK = 12,
+ jpxCSYCCK = 13,
+ jpxCSCIELab = 14,
+ jpxCSsRGB = 16,
+ jpxCSGrayscale = 17,
+ jpxCSBiLevel2 = 18,
+ jpxCSCIEJab = 19,
+ jpxCSCISesRGB = 20,
+ jpxCSROMMRGB = 21,
+ jpxCSsRGBYCbCr = 22,
+ jpxCSYPbPr1125 = 23,
+ jpxCSYPbPr1250 = 24
+};
+
+struct JPXColorSpec {
+ Guint meth; // method
+ int prec; // precedence
+ union {
+ struct {
+ JPXColorSpaceType type; // color space type
+ union {
+ struct {
+ Guint rl, ol, ra, oa, rb, ob, il;
+ } cieLab;
+ };
+ } enumerated;
+ };
+};
+
+//------------------------------------------------------------------------
+
+struct JPXPalette {
+ Guint nEntries; // number of entries in the palette
+ Guint nComps; // number of components in each entry
+ Guint *bpc; // bits per component, for each component
+ int *c; // color data:
+ // c[i*nComps+j] = entry i, component j
+};
+
+//------------------------------------------------------------------------
+
+struct JPXCompMap {
+ Guint nChannels; // number of channels
+ Guint *comp; // codestream components mapped to each channel
+ Guint *type; // 0 for direct use, 1 for palette mapping
+ Guint *pComp; // palette components to use
+};
+
+//------------------------------------------------------------------------
+
+struct JPXChannelDefn {
+ Guint nChannels; // number of channels
+ Guint *idx; // channel indexes
+ Guint *type; // channel types
+ Guint *assoc; // channel associations
+};
+
+//------------------------------------------------------------------------
+
+struct JPXTagTreeNode {
+ GBool finished; // true if this node is finished
+ Guint val; // current value
+};
+
+//------------------------------------------------------------------------
+
+struct JPXCoeff {
+ Gushort flags; // flag bits
+ Gushort len; // number of significant bits in mag
+ Guint mag; // magnitude value
+};
+
+// coefficient flags
+#define jpxCoeffSignificantB 0
+#define jpxCoeffTouchedB 1
+#define jpxCoeffFirstMagRefB 2
+#define jpxCoeffSignB 7
+#define jpxCoeffSignificant (1 << jpxCoeffSignificantB)
+#define jpxCoeffTouched (1 << jpxCoeffTouchedB)
+#define jpxCoeffFirstMagRef (1 << jpxCoeffFirstMagRefB)
+#define jpxCoeffSign (1 << jpxCoeffSignB)
+
+//------------------------------------------------------------------------
+
+struct JPXCodeBlock {
+ //----- size
+ Guint x0, y0, x1, y1; // bounds
+
+ //----- persistent state
+ GBool seen; // true if this code-block has already
+ // been seen
+ Guint lBlock; // base number of bits used for pkt data length
+ Guint nextPass; // next coding pass
+
+ //---- info from first packet
+ Guint nZeroBitPlanes; // number of zero bit planes
+
+ //----- info for the current packet
+ Guint included; // code-block inclusion in this packet:
+ // 0=not included, 1=included
+ Guint nCodingPasses; // number of coding passes in this pkt
+ Guint dataLen; // pkt data length
+
+ //----- coefficient data
+ JPXCoeff *coeffs; // the coefficients
+ JArithmeticDecoderStats // arithmetic decoder stats
+ *stats;
+};
+
+//------------------------------------------------------------------------
+
+struct JPXSubband {
+ //----- computed
+ Guint x0, y0, x1, y1; // bounds
+ Guint nXCBs, nYCBs; // number of code-blocks in the x and y
+ // directions
+
+ //----- tag trees
+ Guint maxTTLevel; // max tag tree level
+ JPXTagTreeNode *inclusion; // inclusion tag tree for each subband
+ JPXTagTreeNode *zeroBitPlane; // zero-bit plane tag tree for each
+ // subband
+
+ //----- children
+ JPXCodeBlock *cbs; // the code-blocks (len = nXCBs * nYCBs)
+};
+
+//------------------------------------------------------------------------
+
+struct JPXPrecinct {
+ //----- computed
+ Guint x0, y0, x1, y1; // bounds of the precinct
+
+ //----- children
+ JPXSubband *subbands; // the subbands
+};
+
+//------------------------------------------------------------------------
+
+struct JPXResLevel {
+ //----- from the COD and COC segments (main and tile)
+ Guint precinctWidth; // log2(precinct width)
+ Guint precinctHeight; // log2(precinct height)
+
+ //----- computed
+ Guint x0, y0, x1, y1; // bounds of the tile-comp (for this res level)
+ Guint bx0[3], by0[3], // subband bounds
+ bx1[3], by1[3];
+
+ //---- children
+ JPXPrecinct *precincts; // the precincts
+};
+
+//------------------------------------------------------------------------
+
+struct JPXTileComp {
+ //----- from the SIZ segment
+ GBool sgned; // 1 for signed, 0 for unsigned
+ Guint prec; // precision, in bits
+ Guint hSep; // horizontal separation of samples
+ Guint vSep; // vertical separation of samples
+
+ //----- from the COD and COC segments (main and tile)
+ Guint style; // coding style parameter (Scod / Scoc)
+ Guint nDecompLevels; // number of decomposition levels
+ Guint codeBlockW; // log2(code-block width)
+ Guint codeBlockH; // log2(code-block height)
+ Guint codeBlockStyle; // code-block style
+ Guint transform; // wavelet transformation
+
+ //----- from the QCD and QCC segments (main and tile)
+ Guint quantStyle; // quantization style
+ Guint *quantSteps; // quantization step size for each subband
+ Guint nQuantSteps; // number of entries in quantSteps
+
+ //----- computed
+ Guint x0, y0, x1, y1; // bounds of the tile-comp, in ref coords
+ Guint cbW; // code-block width
+ Guint cbH; // code-block height
+
+ //----- image data
+ int *data; // the decoded image data
+ int *buf; // intermediate buffer for the inverse
+ // transform
+
+ //----- children
+ JPXResLevel *resLevels; // the resolution levels
+ // (len = nDecompLevels + 1)
+};
+
+//------------------------------------------------------------------------
+
+struct JPXTile {
+ //----- from the COD segments (main and tile)
+ Guint progOrder; // progression order
+ Guint nLayers; // number of layers
+ Guint multiComp; // multiple component transformation
+
+ //----- computed
+ Guint x0, y0, x1, y1; // bounds of the tile, in ref coords
+ Guint maxNDecompLevels; // max number of decomposition levels used
+ // in any component in this tile
+
+ //----- progression order loop counters
+ Guint comp; // component
+ Guint res; // resolution level
+ Guint precinct; // precinct
+ Guint layer; // layer
+
+ //----- children
+ JPXTileComp *tileComps; // the tile-components (len = JPXImage.nComps)
+};
+
+//------------------------------------------------------------------------
+
+struct JPXImage {
+ //----- from the SIZ segment
+ Guint xSize, ySize; // size of reference grid
+ Guint xOffset, yOffset; // image offset
+ Guint xTileSize, yTileSize; // size of tiles
+ Guint xTileOffset, // offset of first tile
+ yTileOffset;
+ Guint nComps; // number of components
+
+ //----- computed
+ Guint nXTiles; // number of tiles in x direction
+ Guint nYTiles; // number of tiles in y direction
+
+ //----- children
+ JPXTile *tiles; // the tiles (len = nXTiles * nYTiles)
+};
+
+//------------------------------------------------------------------------
+
+class JPXStream: public FilterStream {
+public:
+
+ JPXStream(Stream *strA);
+ virtual ~JPXStream();
+ virtual StreamKind getKind() { return strJPX; }
+ virtual void reset();
+ virtual int getChar();
+ virtual int lookChar();
+ virtual GString *getPSFilter(int psLevel, char *indent);
+ virtual GBool isBinary(GBool last = gTrue);
+
+private:
+
+ void fillReadBuf();
+ GBool readBoxes();
+ GBool readColorSpecBox(Guint dataLen);
+ GBool readCodestream(Guint len);
+ GBool readTilePart();
+ GBool readTilePartData(Guint tileIdx,
+ Guint tilePartLen, GBool tilePartToEOC);
+ GBool readCodeBlockData(JPXTileComp *tileComp,
+ JPXResLevel *resLevel,
+ JPXPrecinct *precinct,
+ JPXSubband *subband,
+ Guint res, Guint sb,
+ JPXCodeBlock *cb);
+ void inverseTransform(JPXTileComp *tileComp);
+ void inverseTransformLevel(JPXTileComp *tileComp,
+ Guint r, JPXResLevel *resLevel,
+ Guint nx0, Guint ny0,
+ Guint nx1, Guint ny1);
+ void inverseTransform1D(JPXTileComp *tileComp,
+ int *data, Guint stride,
+ Guint i0, Guint i1);
+ GBool inverseMultiCompAndDC(JPXTile *tile);
+ GBool readBoxHdr(Guint *boxType, Guint *boxLen, Guint *dataLen);
+ int readMarkerHdr(int *segType, Guint *segLen);
+ GBool readUByte(Guint *x);
+ GBool readByte(int *x);
+ GBool readUWord(Guint *x);
+ GBool readULong(Guint *x);
+ GBool readNBytes(int nBytes, GBool signd, int *x);
+ GBool readBits(int nBits, Guint *x);
+ void clearBitBuf();
+
+ Guint nComps; // number of components
+ Guint *bpc; // bits per component, for each component
+ Guint width, height; // image size
+ GBool haveImgHdr; // set if a JP2/JPX image header has been
+ // found
+ JPXColorSpec cs; // color specification
+ GBool haveCS; // set if a color spec has been found
+ JPXPalette palette; // the palette
+ GBool havePalette; // set if a palette has been found
+ JPXCompMap compMap; // the component mapping
+ GBool haveCompMap; // set if a component mapping has been found
+ JPXChannelDefn channelDefn; // channel definition
+ GBool haveChannelDefn; // set if a channel defn has been found
+
+ JPXImage img; // JPEG2000 decoder data
+ Guint bitBuf; // buffer for bit reads
+ int bitBufLen; // number of bits in bitBuf
+ GBool bitBufSkip; // true if next bit should be skipped
+ // (for bit stuffing)
+ Guint byteCount; // number of bytes read since last call
+ // to clearBitBuf
+
+ Guint curX, curY, curComp; // current position for lookChar/getChar
+ Guint readBuf; // read buffer
+ Guint readBufLen; // number of valid bits in readBuf
+};
+
+#endif
git.asbjorn.biz / swftools.git / blobdiff