312 lines
7 KiB
C
312 lines
7 KiB
C
/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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faxtiff.h
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Abstract:
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Declarations for Group3 2D compression and generating TIFF files
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Environment:
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Windows NT Fax driver, kernel mode
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Revision History:
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01/23/96 -davidx-
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Created it.
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dd-mm-yy -author-
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description
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NOTE:
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Structure of the TIFF output file from the driver:
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4949 II
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002a 42
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00000008 Offset to the first IFD
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IFD for the first page
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Number of directory entries
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NEWSUBFILETYPE LONG 1 2 - Page in a multi-page document
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PAGENUMBER SHORT 2 PageNumber 0000
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IMAGEWIDTH LONG 1 ImageWidth
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IMAGEHEIGHT LONG 1 ImageHeight
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BITSPERSAMPLE SHORT 1 1
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SAMPLESPERPIXEL SHORT 1 1
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COMPRESSION SHORT 1 4 - G4Fax
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GROUP4OPTIONS SHORT 1 0
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CLEANFAXDATA SHORT 1 0
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FILLORDER SHORT 1 2
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PHOTOMETRIC SHORT 1 0 - WhiteIsZero
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RESOLUTIONUNIT SHORT 1 2 - Inch
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XRESOLUTION RATIONAL 1 Xdpi
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YRESOLUTION RATIONAL 1 Ydpi
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ROWSPERSTRIP LONG 1 ImageHeight
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STRIPBYTECOUNTS LONG 1 Compressed data byte count
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STRIPOFFSETS LONG 1 Offset to compressed data
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Next IFD offset
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Compressed data for the first page
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IFD for the second page
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Compressed data for the second page
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...
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Last IFD
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0001
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SOFTWARE ASCII n "Windows NT Fax Driver"
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00000000
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00000000
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--*/
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#ifndef _FAXTIFF_H_
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#define _FAXTIFF_H_
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//
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// TIFF field tag and type constants
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//
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#define TIFFTYPE_ASCII 2
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#define TIFFTYPE_SHORT 3
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#define TIFFTYPE_LONG 4
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#define TIFFTYPE_RATIONAL 5
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#define TIFFTAG_NEWSUBFILETYPE 254
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#define SUBFILETYPE_PAGE 2
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#define TIFFTAG_IMAGEWIDTH 256
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#define TIFFTAG_IMAGEHEIGHT 257
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#define TIFFTAG_BITSPERSAMPLE 258
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#define TIFFTAG_COMPRESSION 259
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#define COMPRESSION_G3FAX 3
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#define COMPRESSION_G4FAX 4
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#define TIFFTAG_PHOTOMETRIC 262
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#define PHOTOMETRIC_WHITEIS0 0
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#define PHOTOMETRIC_BLACKIS0 1
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#define TIFFTAG_FILLORDER 266
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#define FILLORDER_MSB 1
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#define FILLORDER_LSB 2
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#define TIFFTAG_STRIPOFFSETS 273
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#define TIFFTAG_SAMPLESPERPIXEL 277
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#define TIFFTAG_ROWSPERSTRIP 278
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#define TIFFTAG_STRIPBYTECOUNTS 279
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#define TIFFTAG_XRESOLUTION 282
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#define TIFFF_RES_X 204
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#define TIFFTAG_YRESOLUTION 283
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#define TIFFF_RES_Y 196
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#define TIFFF_RES_Y_DRAFT 98
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#define TIFFTAG_G3OPTIONS 292
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#define G3_2D 1
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#define G3_ALIGNEOL 4
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#define TIFFTAG_G4OPTIONS 293
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#define TIFFTAG_RESUNIT 296
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#define RESUNIT_INCH 2
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#define TIFFTAG_PAGENUMBER 297
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#define TIFFTAG_SOFTWARE 305
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#define TIFFTAG_CLEANFAXDATA 327
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//
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// Data structure for representing our TIFF output file header information
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//
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typedef struct {
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WORD magic1; // II
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WORD magic2; // 42
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LONG firstIFD; // offset to first IFD
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DWORD signature; // driver private signature
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} TIFFFILEHEADER;
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#define TIFF_MAGIC1 'II'
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#define TIFF_MAGIC2 42
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//
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// Data structure for representing a single IFD entry
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//
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typedef struct {
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WORD tag; // field tag
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WORD type; // field type
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DWORD count; // number of values
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DWORD value; // value or value offset
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} IFDENTRY, *PIFDENTRY;
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//
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// IFD entries we generate for each page
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//
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enum {
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IFD_NEWSUBFILETYPE,
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IFD_IMAGEWIDTH,
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IFD_IMAGEHEIGHT,
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IFD_BITSPERSAMPLE,
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IFD_COMPRESSION,
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IFD_PHOTOMETRIC,
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IFD_FILLORDER,
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IFD_STRIPOFFSETS,
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IFD_SAMPLESPERPIXEL,
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IFD_ROWSPERSTRIP,
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IFD_STRIPBYTECOUNTS,
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IFD_XRESOLUTION,
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IFD_YRESOLUTION,
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IFD_G3G4OPTIONS,
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IFD_RESUNIT,
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IFD_PAGENUMBER,
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IFD_SOFTWARE,
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IFD_CLEANFAXDATA,
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NUM_IFD_ENTRIES
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};
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typedef struct {
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WORD reserved;
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WORD wIFDEntries;
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IFDENTRY ifd[NUM_IFD_ENTRIES];
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DWORD nextIFDOffset;
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DWORD filler;
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DWORD xresNum;
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DWORD xresDenom;
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DWORD yresNum;
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DWORD yresDenom;
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CHAR software[32];
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} FAXIFD, *PFAXIFD;
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//
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// Output compressed data bytes in correct fill order
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//
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#ifdef USELSB
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#define OutputByte(n) BitReverseTable[(BYTE) (n)]
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#else
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#define OutputByte(n) ((BYTE) (n))
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#endif
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//
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// Output a sequence of compressed bits
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//
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#define OutputBits(pdev, length, code) { \
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(pdev)->bitdata |= (code) << ((pdev)->bitcnt - (length)); \
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if (((pdev)->bitcnt -= (length)) <= 2*BYTEBITS) { \
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*(pdev)->pCompBufPtr++ = OutputByte(((pdev)->bitdata >> 3*BYTEBITS)); \
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*(pdev)->pCompBufPtr++ = OutputByte(((pdev)->bitdata >> 2*BYTEBITS)); \
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(pdev)->bitdata <<= 2*BYTEBITS; \
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(pdev)->bitcnt += 2*BYTEBITS; \
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} \
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}
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//
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// Flush any leftover bits into the compressed bitmap buffer
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//
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#define FlushBits(pdev) { \
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while ((pdev)->bitcnt < DWORDBITS) { \
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(pdev)->bitcnt += BYTEBITS; \
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*(pdev)->pCompBufPtr++ = OutputByte(((pdev)->bitdata >> 3*BYTEBITS)); \
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(pdev)->bitdata <<= BYTEBITS; \
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} \
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(pdev)->bitdata = 0; \
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(pdev)->bitcnt = DWORDBITS; \
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}
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//
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// Find the next pixel on the scanline whose color is opposite of
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// the specified color, starting from the specified starting point
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//
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#define NextChangingElement(pbuf, startBit, stopBit, isBlack) \
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((startBit) + ((isBlack) ? FindBlackRun((pbuf), (startBit), (stopBit)) : \
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FindWhiteRun((pbuf), (startBit), (stopBit))))
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//
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// Check if the specified pixel on the scanline is black or white
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// 1 - the specified pixel is black
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// 0 - the specified pixel is white
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//
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#define GetBit(pbuf, bit) (((pbuf)[(bit) >> 3] >> (((bit) ^ 7) & 7)) & 1)
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//
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// Compress the specified number of scanlines
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//
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BOOL
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EncodeFaxData(
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PDEVDATA pdev,
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PBYTE plinebuf,
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INT lineWidth,
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INT lineCount
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);
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//
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// Output TIFF IFD for the current page
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//
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BOOL
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WriteTiffIFD(
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PDEVDATA pdev,
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LONG bmpWidth,
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LONG bmpHeight,
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DWORD compressedBits
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);
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//
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// Output the compressed bitmap data for the current page
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//
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BOOL
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WriteTiffBits(
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PDEVDATA pdev,
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PBYTE pCompBits,
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DWORD compressedBits
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);
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//
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// Enlarge the buffer for holding the compressed bitmap data
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//
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BOOL
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GrowCompBitsBuffer(
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PDEVDATA pdev,
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LONG scanlineSize
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);
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//
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// Free the buffer for holding the compressed bitmap data
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//
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VOID
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FreeCompBitsBuffer(
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PDEVDATA pdev
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);
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//
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// Initialize the fax encoder
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//
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BOOL
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InitFaxEncoder(
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PDEVDATA pdev,
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LONG bmpWidth,
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LONG bmpHeight
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);
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#endif // !_FAXTIFF_H_
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