+++ /dev/null
-/* $Id: tif_ojpeg.c,v 1.1 2005/06/17 13:54:52 vp153 Exp $ */
-
-#include "tiffiop.h"
-#ifdef OJPEG_SUPPORT
-
-/* JPEG Compression support, as per the original TIFF 6.0 specification.
-
- WARNING: KLUDGE ALERT! The type of JPEG encapsulation defined by the TIFF
- Version 6.0 specification is now totally obsolete and
- deprecated for new applications and images. This file is an unsupported hack
- that was created solely in order to read (but NOT write!) a few old,
- unconverted images still present on some users' computer systems. The code
- isn't pretty or robust, and it won't read every "old format" JPEG-in-TIFF
- file (see Samuel Leffler's draft "TIFF Technical Note No. 2" for a long and
- incomplete list of known problems), but it seems to work well enough in the
- few cases of practical interest to the author; so, "caveat emptor"! This
- file should NEVER be enhanced to write new images using anything other than
- the latest approved JPEG-in-TIFF encapsulation method, implemented by the
- "tif_jpeg.c" file elsewhere in this library.
-
- This file interfaces with Release 6B of the JPEG Library written by theu
- Independent JPEG Group, which you can find on the Internet at:
- ftp://ftp.uu.net:/graphics/jpeg/.
-
- The "C" Preprocessor macros, "[CD]_LOSSLESS_SUPPORTED", are defined by your
- JPEG Library Version 6B only if you have applied a (massive!) patch by Ken
- Murchison of Oceana Matrix Ltd. <ken@oceana.com> to support lossless Huffman
- encoding (TIFF "JPEGProc" tag value = 14). This patch can be found on the
- Internet at: ftp://ftp.oceana.com/pub/ljpeg-6b.tar.gz.
-
- Some old files produced by the Wang Imaging application for Microsoft Windows
- apparently can be decoded only with a special patch to the JPEG Library,
- which defines a subroutine named "jpeg_reset_huff_decode()" in its "jdhuff.c"
- module (the "jdshuff.c" module, if Ken Murchison's patch has been applied).
- Unfortunately the patch differs slightly in each case, and some TIFF Library
- have reported problems finding the code, so both versions appear below; you
- should carefully extract and apply only the version that applies to your JPEG
- Library!
-
- Contributed by Scott Marovich <marovich@hpl.hp.com> with considerable help
- from Charles Auer <Bumble731@msn.com> to unravel the mysteries of image files
- created by the Wang Imaging application for Microsoft Windows.
-*/
-#if 0 /* Patch for JPEG Library WITHOUT lossless Huffman coding */
-*** jdhuff.c.orig Mon Oct 20 17:51:10 1997
---- jdhuff.c Sun Nov 11 17:33:58 2001
-***************
-*** 648,651 ****
---- 648,683 ----
- for (i = 0; i < NUM_HUFF_TBLS; i++) {
- entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
- }
- }
-+
-+ /*
-+ * BEWARE OF KLUDGE: This subroutine is a hack for decoding illegal JPEG-in-
-+ * TIFF encapsulations produced by Microsoft's Wang Imaging
-+ * for Windows application with the public-domain TIFF Library. Based upon an
-+ * examination of selected output files, this program apparently divides a JPEG
-+ * bit-stream into consecutive horizontal TIFF "strips", such that the JPEG
-+ * encoder's/decoder's DC coefficients for each image component are reset before
-+ * each "strip". Moreover, a "strip" is not necessarily encoded in a multiple
-+ * of 8 bits, so one must sometimes discard 1-7 bits at the end of each "strip"
-+ * for alignment to the next input-Byte storage boundary. IJG JPEG Library
-+ * decoder state is not normally exposed to client applications, so this sub-
-+ * routine provides the TIFF Library with a "hook" to make these corrections.
-+ * It should be called after "jpeg_start_decompress()" and before
-+ * "jpeg_finish_decompress()", just before decoding each "strip" using
-+ * "jpeg_read_raw_data()" or "jpeg_read_scanlines()".
-+ *
-+ * This kludge is not sanctioned or supported by the Independent JPEG Group, and
-+ * future changes to the IJG JPEG Library might invalidate it. Do not send bug
-+ * reports about this code to IJG developers. Instead, contact the author for
-+ * advice: Scott B. Marovich <marovich@hpl.hp.com>, Hewlett-Packard Labs, 6/01.
-+ */
-+ GLOBAL(void)
-+ jpeg_reset_huff_decode (register j_decompress_ptr cinfo)
-+ { register huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;
-+ register int ci = 0;
-+
-+ /* Discard encoded input bits, up to the next Byte boundary */
-+ entropy->bitstate.bits_left &= ~7;
-+ /* Re-initialize DC predictions to 0 */
-+ do entropy->saved.last_dc_val[ci] = 0; while (++ci < cinfo->comps_in_scan);
-+ }
-#endif /* Patch for JPEG Library WITHOUT lossless Huffman coding */
-#if 0 /* Patch for JPEG Library WITH lossless Huffman coding */
-*** jdshuff.c.orig Mon Mar 11 16:44:54 2002
---- jdshuff.c Mon Mar 11 16:44:54 2002
-***************
-*** 357,360 ****
---- 357,393 ----
- for (i = 0; i < NUM_HUFF_TBLS; i++) {
- entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
- }
- }
-+
-+ /*
-+ * BEWARE OF KLUDGE: This subroutine is a hack for decoding illegal JPEG-in-
-+ * TIFF encapsulations produced by Microsoft's Wang Imaging
-+ * for Windows application with the public-domain TIFF Library. Based upon an
-+ * examination of selected output files, this program apparently divides a JPEG
-+ * bit-stream into consecutive horizontal TIFF "strips", such that the JPEG
-+ * encoder's/decoder's DC coefficients for each image component are reset before
-+ * each "strip". Moreover, a "strip" is not necessarily encoded in a multiple
-+ * of 8 bits, so one must sometimes discard 1-7 bits at the end of each "strip"
-+ * for alignment to the next input-Byte storage boundary. IJG JPEG Library
-+ * decoder state is not normally exposed to client applications, so this sub-
-+ * routine provides the TIFF Library with a "hook" to make these corrections.
-+ * It should be called after "jpeg_start_decompress()" and before
-+ * "jpeg_finish_decompress()", just before decoding each "strip" using
-+ * "jpeg_read_raw_data()" or "jpeg_read_scanlines()".
-+ *
-+ * This kludge is not sanctioned or supported by the Independent JPEG Group, and
-+ * future changes to the IJG JPEG Library might invalidate it. Do not send bug
-+ * reports about this code to IJG developers. Instead, contact the author for
-+ * advice: Scott B. Marovich <marovich@hpl.hp.com>, Hewlett-Packard Labs, 6/01.
-+ */
-+ GLOBAL(void)
-+ jpeg_reset_huff_decode (register j_decompress_ptr cinfo)
-+ { register shuff_entropy_ptr entropy = (shuff_entropy_ptr)
-+ ((j_lossy_d_ptr)cinfo->codec)->entropy_private;
-+ register int ci = 0;
-+
-+ /* Discard encoded input bits, up to the next Byte boundary */
-+ entropy->bitstate.bits_left &= ~7;
-+ /* Re-initialize DC predictions to 0 */
-+ do entropy->saved.last_dc_val[ci] = 0; while (++ci < cinfo->comps_in_scan);
-+ }
-#endif /* Patch for JPEG Library WITH lossless Huffman coding */
-#include <setjmp.h>
-#include <stdio.h>
-#ifdef FAR
-#undef FAR /* Undefine FAR to avoid conflict with JPEG definition */
-#endif
-#define JPEG_INTERNALS /* Include "jpegint.h" for "DSTATE_*" symbols */
-#define JPEG_CJPEG_DJPEG /* Include all Version 6B+ "jconfig.h" options */
-#undef INLINE
-#include "jpeglib.h"
-#undef JPEG_CJPEG_DJPEG
-#undef JPEG_INTERNALS
-
-/* Hack for files produced by Wang Imaging application on Microsoft Windows */
-extern void jpeg_reset_huff_decode(j_decompress_ptr);
-
-/* On some machines, it may be worthwhile to use "_setjmp()" or "sigsetjmp()"
- instead of "setjmp()". These macros make it easier:
-*/
-#define SETJMP(jbuf)setjmp(jbuf)
-#define LONGJMP(jbuf,code)longjmp(jbuf,code)
-#define JMP_BUF jmp_buf
-
-#define TIFFTAG_WANG_PAGECONTROL 32934
-
-/* Bit-vector offsets for keeping track of TIFF records that we've parsed. */
-
-#define FIELD_JPEGPROC FIELD_CODEC
-#define FIELD_JPEGIFOFFSET (FIELD_CODEC+1)
-#define FIELD_JPEGIFBYTECOUNT (FIELD_CODEC+2)
-#define FIELD_JPEGRESTARTINTERVAL (FIELD_CODEC+3)
-#define FIELD_JPEGTABLES (FIELD_CODEC+4) /* New, post-6.0 JPEG-in-TIFF tag! */
-#define FIELD_JPEGLOSSLESSPREDICTORS (FIELD_CODEC+5)
-#define FIELD_JPEGPOINTTRANSFORM (FIELD_CODEC+6)
-#define FIELD_JPEGQTABLES (FIELD_CODEC+7)
-#define FIELD_JPEGDCTABLES (FIELD_CODEC+8)
-#define FIELD_JPEGACTABLES (FIELD_CODEC+9)
-#define FIELD_WANG_PAGECONTROL (FIELD_CODEC+10)
-#define FIELD_JPEGCOLORMODE (FIELD_CODEC+11)
-
-typedef struct jpeg_destination_mgr jpeg_destination_mgr;
-typedef struct jpeg_source_mgr jpeg_source_mgr;
-typedef struct jpeg_error_mgr jpeg_error_mgr;
-
-/* State variable for each open TIFF file that uses "libjpeg" for JPEG
- decompression. (Note: This file should NEVER perform JPEG compression
- except in the manner implemented by the "tif_jpeg.c" file, elsewhere in this
- library; see comments above.) JPEG Library internal state is recorded in a
- "jpeg_{de}compress_struct", while a "jpeg_common_struct" records a few items
- common to both compression and expansion. The "cinfo" field containing JPEG
- Library state MUST be the 1st member of our own state variable, so that we
- can safely "cast" pointers back and forth.
-*/
-typedef struct /* This module's private, per-image state variable */
- {
- union /* JPEG Library state variable; this MUST be our 1st field! */
- {
- struct jpeg_compress_struct c;
- struct jpeg_decompress_struct d;
- struct jpeg_common_struct comm;
- } cinfo;
- jpeg_error_mgr err; /* JPEG Library error manager */
- JMP_BUF exit_jmpbuf; /* ...for catching JPEG Library failures */
-# ifdef never
-
- /* (The following two fields could be a "union", but they're small enough that
- it's not worth the effort.)
- */
- jpeg_destination_mgr dest; /* Destination for compressed data */
-# endif
- jpeg_source_mgr src; /* Source of expanded data */
- JSAMPARRAY ds_buffer[MAX_COMPONENTS]; /* ->Temporary downsampling buffers */
- TIFF *tif; /* Reverse pointer, needed by some code */
- TIFFVGetMethod vgetparent; /* "Super class" methods... */
- TIFFVSetMethod vsetparent;
- TIFFStripMethod defsparent;
- TIFFTileMethod deftparent;
- void *jpegtables; /* ->"New" JPEG tables, if we synthesized any */
- uint32 is_WANG, /* <=> Wang Imaging for Microsoft Windows output file? */
- jpegtables_length; /* Length of "new" JPEG tables, if they exist */
- tsize_t bytesperline; /* No. of decompressed Bytes per scan line */
- int jpegquality, /* Compression quality level */
- jpegtablesmode, /* What to put in JPEGTables */
- samplesperclump,
- scancount; /* No. of scan lines accumulated */
- J_COLOR_SPACE photometric; /* IJG JPEG Library's photometry code */
- unsigned char h_sampling, /* Luminance sampling factors */
- v_sampling,
- jpegcolormode; /* Who performs RGB <-> YCbCr conversion? */
- /* JPEGCOLORMODE_RAW <=> TIFF Library or its client */
- /* JPEGCOLORMODE_RGB <=> JPEG Library */
- /* These fields are added to support TIFFGetField */
- uint16 jpegproc;
- uint32 jpegifoffset;
- uint32 jpegifbytecount;
- uint32 jpegrestartinterval;
- void* jpeglosslesspredictors;
- uint16 jpeglosslesspredictors_length;
- void* jpegpointtransform;
- uint32 jpegpointtransform_length;
- void* jpegqtables;
- uint32 jpegqtables_length;
- void* jpegdctables;
- uint32 jpegdctables_length;
- void* jpegactables;
- uint32 jpegactables_length;
-
- } OJPEGState;
-#define OJState(tif)((OJPEGState*)(tif)->tif_data)
-
-static const TIFFFieldInfo ojpegFieldInfo[]=/* JPEG-specific TIFF-record tags */
- {
-
- /* This is the current JPEG-in-TIFF metadata-encapsulation tag, and its
- treatment in this file is idiosyncratic. It should never appear in a
- "source" image conforming to the TIFF Version 6.0 specification, so we
- arrange to report an error if it appears. But in order to support possible
- future conversion of "old" JPEG-in-TIFF encapsulations to "new" ones, we
- might wish to synthesize an equivalent value to be returned by the TIFF
- Library's "getfield" method. So, this table tells the TIFF Library to pass
- these records to us in order to filter them below.
- */
- {
- TIFFTAG_JPEGTABLES ,TIFF_VARIABLE2,TIFF_VARIABLE2,
- TIFF_UNDEFINED,FIELD_JPEGTABLES ,FALSE,TRUE ,"JPEGTables"
- },
-
- /* These tags are defined by the TIFF Version 6.0 specification and are now
- obsolete. This module reads them from an old "source" image, but it never
- writes them to a new "destination" image.
- */
- {
- TIFFTAG_JPEGPROC ,1 ,1 ,
- TIFF_SHORT ,FIELD_JPEGPROC ,FALSE,FALSE,"JPEGProc"
- },
- {
- TIFFTAG_JPEGIFOFFSET ,1 ,1 ,
- TIFF_LONG ,FIELD_JPEGIFOFFSET ,FALSE,FALSE,"JPEGInterchangeFormat"
- },
- {
- TIFFTAG_JPEGIFBYTECOUNT ,1 ,1 ,
- TIFF_LONG ,FIELD_JPEGIFBYTECOUNT ,FALSE,FALSE,"JPEGInterchangeFormatLength"
- },
- {
- TIFFTAG_JPEGRESTARTINTERVAL ,1 ,1 ,
- TIFF_SHORT ,FIELD_JPEGRESTARTINTERVAL ,FALSE,FALSE,"JPEGRestartInterval"
- },
- {
- TIFFTAG_JPEGLOSSLESSPREDICTORS,TIFF_VARIABLE,TIFF_VARIABLE,
- TIFF_SHORT ,FIELD_JPEGLOSSLESSPREDICTORS,FALSE,TRUE ,"JPEGLosslessPredictors"
- },
- {
- TIFFTAG_JPEGPOINTTRANSFORM ,TIFF_VARIABLE,TIFF_VARIABLE,
- TIFF_SHORT ,FIELD_JPEGPOINTTRANSFORM ,FALSE,TRUE ,"JPEGPointTransforms"
- },
- {
- TIFFTAG_JPEGQTABLES ,TIFF_VARIABLE,TIFF_VARIABLE,
- TIFF_LONG ,FIELD_JPEGQTABLES ,FALSE,TRUE ,"JPEGQTables"
- },
- {
- TIFFTAG_JPEGDCTABLES ,TIFF_VARIABLE,TIFF_VARIABLE,
- TIFF_LONG ,FIELD_JPEGDCTABLES ,FALSE,TRUE ,"JPEGDCTables"
- },
- {
- TIFFTAG_JPEGACTABLES ,TIFF_VARIABLE,TIFF_VARIABLE,
- TIFF_LONG ,FIELD_JPEGACTABLES ,FALSE,TRUE ,"JPEGACTables"
- },
- {
- TIFFTAG_WANG_PAGECONTROL ,TIFF_VARIABLE,1 ,
- TIFF_LONG ,FIELD_WANG_PAGECONTROL ,FALSE,FALSE,"WANG PageControl"
- },
-
- /* This is a pseudo tag intended for internal use only by the TIFF Library and
- its clients, which should never appear in an input/output image file. It
- specifies whether the TIFF Library (or its client) should do YCbCr <-> RGB
- color-space conversion (JPEGCOLORMODE_RAW <=> 0) or whether we should ask
- the JPEG Library to do it (JPEGCOLORMODE_RGB <=> 1).
- */
- {
- TIFFTAG_JPEGCOLORMODE ,0 ,0 ,
- TIFF_ANY ,FIELD_PSEUDO ,FALSE,FALSE,"JPEGColorMode"
- }
- };
-static const char JPEGLib_name[]={"JPEG Library"},
- bad_bps[]={"%u BitsPerSample not allowed for JPEG"},
- bad_photometry[]={"PhotometricInterpretation %u not allowed for JPEG"},
- bad_subsampling[]={"invalid YCbCr subsampling factor(s)"},
-# ifdef never
- no_write_frac[]={"fractional scan line discarded"},
-# endif
- no_read_frac[]={"fractional scan line not read"},
- no_jtable_space[]={"No space for JPEGTables"};
-
-/* The following diagnostic subroutines interface with and replace default
- subroutines in the JPEG Library. Our basic strategy is to use "setjmp()"/
- "longjmp()" in order to return control to the TIFF Library when the JPEG
- library detects an error, and to use TIFF Library subroutines for displaying
- diagnostic messages to a client application.
-*/
-static void
-TIFFojpeg_error_exit(register j_common_ptr cinfo)
-{
- char buffer[JMSG_LENGTH_MAX];
- int code = cinfo->err->msg_code;
-
- if (((OJPEGState *)cinfo)->is_WANG) {
- if (code == JERR_SOF_DUPLICATE || code == JERR_SOI_DUPLICATE)
- return; /* ignore it */
- }
-
- (*cinfo->err->format_message)(cinfo,buffer);
- TIFFError(JPEGLib_name,buffer); /* Display error message */
- jpeg_abort(cinfo); /* Clean up JPEG Library state */
- LONGJMP(((OJPEGState *)cinfo)->exit_jmpbuf,1); /* Return to TIFF client */
-}
-
-static void
-TIFFojpeg_output_message(register j_common_ptr cinfo)
- { char buffer[JMSG_LENGTH_MAX];
-
- /* This subroutine is invoked only for warning messages, since the JPEG
- Library's "error_exit" method does its own thing and "trace_level" is never
- set > 0.
- */
- (*cinfo->err->format_message)(cinfo,buffer);
- TIFFWarning(JPEGLib_name,buffer);
- }
-
-/* The following subroutines, which also interface with the JPEG Library, exist
- mainly in limit the side effects of "setjmp()" and convert JPEG normal/error
- conditions into TIFF Library return codes.
-*/
-#define CALLJPEG(sp,fail,op)(SETJMP((sp)->exit_jmpbuf)?(fail):(op))
-#define CALLVJPEG(sp,op)CALLJPEG(sp,0,((op),1))
-#ifdef never
-
-static int
-TIFFojpeg_create_compress(register OJPEGState *sp)
- {
- sp->cinfo.c.err = jpeg_std_error(&sp->err); /* Initialize error handling */
- sp->err.error_exit = TIFFojpeg_error_exit;
- sp->err.output_message = TIFFojpeg_output_message;
- return CALLVJPEG(sp,jpeg_create_compress(&sp->cinfo.c));
- }
-
-/* The following subroutines comprise a JPEG Library "destination" data manager
- by directing compressed data from the JPEG Library to a TIFF Library output
- buffer.
-*/
-static void
-std_init_destination(register j_compress_ptr cinfo){} /* "Dummy" stub */
-
-static boolean
-std_empty_output_buffer(register j_compress_ptr cinfo)
- {
-# define sp ((OJPEGState *)cinfo)
- register TIFF *tif = sp->tif;
-
- tif->tif_rawcc = tif->tif_rawdatasize; /* Entire buffer has been filled */
- TIFFFlushData1(tif);
- sp->dest.next_output_byte = (JOCTET *)tif->tif_rawdata;
- sp->dest.free_in_buffer = (size_t)tif->tif_rawdatasize;
- return TRUE;
-# undef sp
- }
-
-static void
-std_term_destination(register j_compress_ptr cinfo)
- {
-# define sp ((OJPEGState *)cinfo)
- register TIFF *tif = sp->tif;
-
- /* NB: The TIFF Library does the final buffer flush. */
- tif->tif_rawcp = (tidata_t)sp->dest.next_output_byte;
- tif->tif_rawcc = tif->tif_rawdatasize - (tsize_t)sp->dest.free_in_buffer;
-# undef sp
- }
-
-/* Alternate destination manager to output JPEGTables field: */
-
-static void
-tables_init_destination(register j_compress_ptr cinfo)
- {
-# define sp ((OJPEGState *)cinfo)
- /* The "jpegtables_length" field is the allocated buffer size while building */
- sp->dest.next_output_byte = (JOCTET *)sp->jpegtables;
- sp->dest.free_in_buffer = (size_t)sp->jpegtables_length;
-# undef sp
- }
-
-static boolean
-tables_empty_output_buffer(register j_compress_ptr cinfo)
- { void *newbuf;
-# define sp ((OJPEGState *)cinfo)
-
- /* The entire buffer has been filled, so enlarge it by 1000 bytes. */
- if (!( newbuf = _TIFFrealloc( (tdata_t)sp->jpegtables
- , (tsize_t)(sp->jpegtables_length + 1000)
- )
- )
- ) ERREXIT1(cinfo,JERR_OUT_OF_MEMORY,100);
- sp->dest.next_output_byte = (JOCTET *)newbuf + sp->jpegtables_length;
- sp->dest.free_in_buffer = (size_t)1000;
- sp->jpegtables = newbuf;
- sp->jpegtables_length += 1000;
- return TRUE;
-# undef sp
- }
-
-static void
-tables_term_destination(register j_compress_ptr cinfo)
- {
-# define sp ((OJPEGState *)cinfo)
- /* Set tables length to no. of Bytes actually emitted. */
- sp->jpegtables_length -= sp->dest.free_in_buffer;
-# undef sp
- }
-
-/*ARGSUSED*/ static int
-TIFFojpeg_tables_dest(register OJPEGState *sp, TIFF *tif)
- {
-
- /* Allocate a working buffer for building tables. The initial size is 1000
- Bytes, which is usually adequate.
- */
- if (sp->jpegtables) _TIFFfree(sp->jpegtables);
- if (!(sp->jpegtables = (void*)
- _TIFFmalloc((tsize_t)(sp->jpegtables_length = 1000))
- )
- )
- {
- sp->jpegtables_length = 0;
- TIFFError("TIFFojpeg_tables_dest",no_jtable_space);
- return 0;
- };
- sp->cinfo.c.dest = &sp->dest;
- sp->dest.init_destination = tables_init_destination;
- sp->dest.empty_output_buffer = tables_empty_output_buffer;
- sp->dest.term_destination = tables_term_destination;
- return 1;
- }
-#else /* well, hardly ever */
-
-static int
-_notSupported(register TIFF *tif)
- { const TIFFCodec *c = TIFFFindCODEC(tif->tif_dir.td_compression);
-
- TIFFError(tif->tif_name,"%s compression not supported",c->name);
- return 0;
- }
-#endif /* never */
-
-/* The following subroutines comprise a JPEG Library "source" data manager by
- by directing compressed data to the JPEG Library from a TIFF Library input
- buffer.
-*/
-static void
-std_init_source(register j_decompress_ptr cinfo)
- {
-# define sp ((OJPEGState *)cinfo)
- register TIFF *tif = sp->tif;
-
- if (sp->src.bytes_in_buffer == 0)
- {
- sp->src.next_input_byte = (const JOCTET *)tif->tif_rawdata;
- sp->src.bytes_in_buffer = (size_t)tif->tif_rawcc;
- };
-# undef sp
- }
-
-static boolean
-std_fill_input_buffer(register j_decompress_ptr cinfo)
- { static const JOCTET dummy_EOI[2]={0xFF,JPEG_EOI};
-# define sp ((OJPEGState *)cinfo)
-
- /* Control should never get here, since an entire strip/tile is read into
- memory before the decompressor is called; thus, data should have been
- supplied by the "init_source" method. ...But, sometimes things fail.
- */
- WARNMS(cinfo,JWRN_JPEG_EOF);
- sp->src.next_input_byte = dummy_EOI; /* Insert a fake EOI marker */
- sp->src.bytes_in_buffer = sizeof dummy_EOI;
- return TRUE;
-# undef sp
- }
-
-static void
-std_skip_input_data(register j_decompress_ptr cinfo, long num_bytes)
- {
-# define sp ((OJPEGState *)cinfo)
-
- if (num_bytes > 0)
- {
- if (num_bytes > (long)sp->src.bytes_in_buffer) /* oops: buffer overrun */
- (void)std_fill_input_buffer(cinfo);
- else
- {
- sp->src.next_input_byte += (size_t)num_bytes;
- sp->src.bytes_in_buffer -= (size_t)num_bytes;
- }
- }
-# undef sp
- }
-
-/*ARGSUSED*/ static void
-std_term_source(register j_decompress_ptr cinfo){} /* "Dummy" stub */
-
-/* Allocate temporary I/O buffers for downsampled data, using values computed in
- "jpeg_start_{de}compress()". We use the JPEG Library's allocator so that
- buffers will be released automatically when done with a strip/tile. This is
- also a handy place to compute samplesperclump, bytesperline, etc.
-*/
-static int
-alloc_downsampled_buffers(TIFF *tif,jpeg_component_info *comp_info,
- int num_components)
- { register OJPEGState *sp = OJState(tif);
-
- sp->samplesperclump = 0;
- if (num_components > 0)
- { tsize_t size = sp->cinfo.comm.is_decompressor
-# ifdef D_LOSSLESS_SUPPORTED
- ? sp->cinfo.d.min_codec_data_unit
-# else
- ? DCTSIZE
-# endif
-# ifdef C_LOSSLESS_SUPPORTED
- : sp->cinfo.c.data_unit;
-# else
- : DCTSIZE;
-# endif
- int ci = 0;
- register jpeg_component_info *compptr = comp_info;
-
- do
- { JSAMPARRAY buf;
-
- sp->samplesperclump +=
- compptr->h_samp_factor * compptr->v_samp_factor;
-# if defined(C_LOSSLESS_SUPPORTED) || defined(D_LOSSLESS_SUPPORTED)
- if (!(buf = CALLJPEG(sp,0,(*sp->cinfo.comm.mem->alloc_sarray)(&sp->cinfo.comm,JPOOL_IMAGE,compptr->width_in_data_units*size,compptr->v_samp_factor*size))))
-# else
- if (!(buf = CALLJPEG(sp,0,(*sp->cinfo.comm.mem->alloc_sarray)(&sp->cinfo.comm,JPOOL_IMAGE,compptr->width_in_blocks*size,compptr->v_samp_factor*size))))
-# endif
- return 0;
- sp->ds_buffer[ci] = buf;
- }
- while (++compptr,++ci < num_components);
- };
- return 1;
- }
-#ifdef never
-
-/* JPEG Encoding begins here. */
-
-/*ARGSUSED*/ static int
-OJPEGEncode(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
- { tsize_t rows; /* No. of unprocessed rows in file */
- register OJPEGState *sp = OJState(tif);
-
- /* Encode a chunk of pixels, where returned data is NOT down-sampled (the
- standard case). The data is expected to be written in scan-line multiples.
- */
- if (cc % sp->bytesperline) TIFFWarning(tif->tif_name,no_write_frac);
- if ( (cc /= bytesperline) /* No. of complete rows in caller's buffer */
- > (rows = sp->cinfo.c.image_height - sp->cinfo.c.next_scanline)
- ) cc = rows;
- while (--cc >= 0)
- {
- if ( CALLJPEG(sp,-1,jpeg_write_scanlines(&sp->cinfo.c,(JSAMPARRAY)&buf,1))
- != 1
- ) return 0;
- ++tif->tif_row;
- buf += sp->bytesperline;
- };
- return 1;
- }
-
-/*ARGSUSED*/ static int
-OJPEGEncodeRaw(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
- { tsize_t rows; /* No. of unprocessed rows in file */
- JDIMENSION lines_per_MCU, size;
- register OJPEGState *sp = OJState(tif);
-
- /* Encode a chunk of pixels, where returned data is down-sampled as per the
- sampling factors. The data is expected to be written in scan-line
- multiples.
- */
- cc /= sp->bytesperline;
- if (cc % sp->bytesperline) TIFFWarning(tif->tif_name,no_write_frac);
- if ( (cc /= bytesperline) /* No. of complete rows in caller's buffer */
- > (rows = sp->cinfo.c.image_height - sp->cinfo.c.next_scanline)
- ) cc = rows;
-# ifdef C_LOSSLESS_SUPPORTED
- lines_per_MCU = sp->cinfo.c.max_samp_factor*(size = sp->cinfo.d.data_unit);
-# else
- lines_per_MCU = sp->cinfo.c.max_samp_factor*(size = DCTSIZE);
-# endif
- while (--cc >= 0)
- { int ci = 0, clumpoffset = 0;
- register jpeg_component_info *compptr = sp->cinfo.c.comp_info;
-
- /* The fastest way to separate the data is to make 1 pass over the scan
- line for each row of each component.
- */
- do
- { int ypos = 0;
-
- do
- { int padding;
- register JSAMPLE *inptr = (JSAMPLE*)buf + clumpoffset,
- *outptr =
- sp->ds_buffer[ci][sp->scancount*compptr->v_samp_factor+ypos];
- /* Cb,Cr both have sampling factors 1, so this is correct */
- register int clumps_per_line =
- sp->cinfo.c.comp_info[1].downsampled_width,
- xpos;
-
- padding = (int)
-# ifdef C_LOSSLESS_SUPPORTED
- ( compptr->width_in_data_units * size
-# else
- ( compptr->width_in_blocks * size
-# endif
- - clumps_per_line * compptr->h_samp_factor
- );
- if (compptr->h_samp_factor == 1) /* Cb & Cr fast path */
- do *outptr++ = *inptr;
- while ((inptr += sp->samplesperclump),--clumps_per_line > 0);
- else /* general case */
- do
- {
- xpos = 0;
- do *outptr++ = inptr[xpos];
- while (++xpos < compptr->h_samp_factor);
- }
- while ((inptr += sp->samplesperclump),--clumps_per_line > 0);
- xpos = 0; /* Pad each scan line as needed */
- do outptr[0] = outptr[-1]; while (++outptr,++xpos < padding);
- clumpoffset += compptr->h_samp_factor;
- }
- while (++ypos < compptr->v_samp_factor);
- }
- while (++compptr,++ci < sp->cinfo.c.num_components);
- if (++sp->scancount >= size)
- {
- if ( CALLJPEG(sp,-1,jpeg_write_raw_data(&sp->cinfo.c,sp->ds_buffer,lines_per_MCU))
- != lines_per_MCU
- ) return 0;
- sp->scancount = 0;
- };
- ++tif->tif_row++
- buf += sp->bytesperline;
- };
- return 1;
- }
-
-static int
-OJPEGSetupEncode(register TIFF *tif)
- { static const char module[]={"OJPEGSetupEncode"};
- uint32 segment_height, segment_width;
- int status = 1; /* Assume success by default */
- register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
-
- /* Verify miscellaneous parameters. This will need work if the TIFF Library
- ever supports different depths for different components, or if the JPEG
- Library ever supports run-time depth selection. Neither seems imminent.
- */
- if (td->td_bitspersample != 8)
- {
- TIFFError(module,bad_bps,td->td_bitspersample);
- status = 0;
- };
-
- /* The TIFF Version 6.0 specification and IJG JPEG Library accept different
- sets of color spaces, so verify that our image belongs to the common subset
- and map its photometry code, then initialize to handle subsampling and
- optional JPEG Library YCbCr <-> RGB color-space conversion.
- */
- switch (td->td_photometric)
- {
- case PHOTOMETRIC_YCBCR :
-
- /* ISO IS 10918-1 requires that JPEG subsampling factors be 1-4, but
- TIFF Version 6.0 is more restrictive: only 1, 2, and 4 are allowed.
- */
- if ( ( td->td_ycbcrsubsampling[0] == 1
- || td->td_ycbcrsubsampling[0] == 2
- || td->td_ycbcrsubsampling[0] == 4
- )
- && ( td->td_ycbcrsubsampling[1] == 1
- || td->td_ycbcrsubsampling[1] == 2
- || td->td_ycbcrsubsampling[1] == 4
- )
- )
- sp->cinfo.c.raw_data_in =
- ( (sp->h_sampling = td->td_ycbcrsubsampling[0]) << 3
- | (sp->v_sampling = td->td_ycbcrsubsampling[1])
- ) != 011;
- else
- {
- TIFFError(module,bad_subsampling);
- status = 0;
- };
-
- /* A ReferenceBlackWhite field MUST be present, since the default value
- is inapproriate for YCbCr. Fill in the proper value if the
- application didn't set it.
- */
- if (!TIFFFieldSet(tif,FIELD_REFBLACKWHITE))
- { float refbw[6];
- long top = 1L << td->td_bitspersample;
-
- refbw[0] = 0;
- refbw[1] = (float)(top-1L);
- refbw[2] = (float)(top>>1);
- refbw[3] = refbw[1];
- refbw[4] = refbw[2];
- refbw[5] = refbw[1];
- TIFFSetField(tif,TIFFTAG_REFERENCEBLACKWHITE,refbw);
- };
- sp->cinfo.c.jpeg_color_space = JCS_YCbCr;
- if (sp->jpegcolormode == JPEGCOLORMODE_RGB)
- {
- sp->cinfo.c.raw_data_in = FALSE;
- sp->in_color_space = JCS_RGB;
- break;
- };
- goto L2;
- case PHOTOMETRIC_MINISBLACK:
- sp->cinfo.c.jpeg_color_space = JCS_GRAYSCALE;
- goto L1;
- case PHOTOMETRIC_RGB :
- sp->cinfo.c.jpeg_color_space = JCS_RGB;
- goto L1;
- case PHOTOMETRIC_SEPARATED :
- sp->cinfo.c.jpeg_color_space = JCS_CMYK;
- L1: sp->jpegcolormode = JPEGCOLORMODE_RAW; /* No JPEG Lib. conversion */
- L2: sp->cinfo.d.in_color_space = sp->cinfo.d.jpeg_color-space;
- break;
- default :
- TIFFError(module,bad_photometry,td->td_photometric);
- status = 0;
- };
- tif->tif_encoderow = tif->tif_encodestrip = tif->tif_encodetile =
- sp->cinfo.c.raw_data_in ? OJPEGEncodeRaw : OJPEGEncode;
- if (isTiled(tif))
- { tsize_t size;
-
-# ifdef C_LOSSLESS_SUPPORTED
- if ((size = sp->v_sampling*sp->cinfo.c.data_unit) < 16) size = 16;
-# else
- if ((size = sp->v_sampling*DCTSIZE) < 16) size = 16;
-# endif
- if ((segment_height = td->td_tilelength) % size)
- {
- TIFFError(module,"JPEG tile height must be multiple of %d",size);
- status = 0;
- };
-# ifdef C_LOSSLESS_SUPPORTED
- if ((size = sp->h_sampling*sp->cinfo.c.data_unit) < 16) size = 16;
-# else
- if ((size = sp->h_sampling*DCTSIZE) < 16) size = 16;
-# endif
- if ((segment_width = td->td_tilewidth) % size)
- {
- TIFFError(module,"JPEG tile width must be multiple of %d",size);
- status = 0;
- };
- sp->bytesperline = TIFFTileRowSize(tif);
- }
- else
- { tsize_t size;
-
-# ifdef C_LOSSLESS_SUPPORTED
- if ((size = sp->v_sampling*sp->cinfo.c.data_unit) < 16) size = 16;
-# else
- if ((size = sp->v_sampling*DCTSIZE) < 16) size = 16;
-# endif
- if (td->td_rowsperstrip < (segment_height = td->td_imagelength))
- {
- if (td->td_rowsperstrip % size)
- {
- TIFFError(module,"JPEG RowsPerStrip must be multiple of %d",size);
- status = 0;
- };
- segment_height = td->td_rowsperstrip;
- };
- segment_width = td->td_imagewidth;
- sp->bytesperline = tif->tif_scanlinesize;
- };
- if (segment_width > 65535 || segment_height > 65535)
- {
- TIFFError(module,"Strip/tile too large for JPEG");
- status = 0;
- };
-
- /* Initialize all JPEG parameters to default values. Note that the JPEG
- Library's "jpeg_set_defaults()" method needs legal values for the
- "in_color_space" and "input_components" fields.
- */
- sp->cinfo.c.input_components = 1; /* Default for JCS_UNKNOWN */
- if (!CALLVJPEG(sp,jpeg_set_defaults(&sp->cinfo.c))) status = 0;
- switch (sp->jpegtablesmode & (JPEGTABLESMODE_HUFF|JPEGTABLESMODE_QUANT))
- { register JHUFF_TBL *htbl;
- register JQUANT_TBL *qtbl;
-
- case 0 :
- sp->cinfo.c.optimize_coding = TRUE;
- case JPEGTABLESMODE_HUFF :
- if (!CALLVJPEG(sp,jpeg_set_quality(&sp->cinfo.c,sp->jpegquality,FALSE)))
- return 0;
- if (qtbl = sp->cinfo.c.quant_tbl_ptrs[0]) qtbl->sent_table = FALSE;
- if (qtbl = sp->cinfo.c.quant_tbl_ptrs[1]) qtbl->sent_table = FALSE;
- goto L3;
- case JPEGTABLESMODE_QUANT :
- sp->cinfo.c.optimize_coding = TRUE;
-
- /* We do not support application-supplied JPEG tables, so mark the field
- "not present".
- */
- L3: TIFFClrFieldBit(tif,FIELD_JPEGTABLES);
- break;
- case JPEGTABLESMODE_HUFF|JPEGTABLESMODE_QUANT:
- if ( !CALLVJPEG(sp,jpeg_set_quality(&sp->cinfo.c,sp->jpegquality,FALSE))
- || !CALLVJPEG(sp,jpeg_suppress_tables(&sp->cinfo.c,TRUE))
- )
- {
- status = 0;
- break;
- };
- if (qtbl = sp->cinfo.c.quant_tbl_ptrs[0]) qtbl->sent_table = FALSE;
- if (htbl = sp->cinfo.c.dc_huff_tbl_ptrs[0]) htbl->sent_table = FALSE;
- if (htbl = sp->cinfo.c.ac_huff_tbl_ptrs[0]) htbl->sent_table = FALSE;
- if (sp->cinfo.c.jpeg_color_space == JCS_YCbCr)
- {
- if (qtbl = sp->cinfo.c.quant_tbl_ptrs[1])
- qtbl->sent_table = FALSE;
- if (htbl = sp->cinfo.c.dc_huff_tbl_ptrs[1])
- htbl->sent_table = FALSE;
- if (htbl = sp->cinfo.c.ac_huff_tbl_ptrs[1])
- htbl->sent_table = FALSE;
- };
- if ( TIFFojpeg_tables_dest(sp,tif)
- && CALLVJPEG(sp,jpeg_write_tables(&sp->cinfo.c))
- )
- {
-
- /* Mark the field "present". We can't use "TIFFSetField()" because
- "BEENWRITING" is already set!
- */
- TIFFSetFieldBit(tif,FIELD_JPEGTABLES);
- tif->tif_flags |= TIFF_DIRTYDIRECT;
- }
- else status = 0;
- };
- if ( sp->cinfo.c.raw_data_in
- && !alloc_downsampled_buffers(tif,sp->cinfo.c.comp_info,
- sp->cinfo.c.num_components)
- ) status = 0;
- if (status == 0) return 0; /* If TIFF errors, don't bother to continue */
- /* Grab parameters that are same for all strips/tiles. */
-
- sp->dest.init_destination = std_init_destination;
- sp->dest.empty_output_buffer = std_empty_output_buffer;
- sp->dest.term_destination = std_term_destination;
- sp->cinfo.c.dest = &sp->dest;
- sp->cinfo.c.data_precision = td->td_bitspersample;
- sp->cinfo.c.write_JFIF_header = /* Don't write extraneous markers */
- sp->cinfo.c.write_Adobe_marker = FALSE;
- sp->cinfo.c.image_width = segment_width;
- sp->cinfo.c.image_height = segment_height;
- sp->cinfo.c.comp_info[0].h_samp_factor =
- sp->cinfo.c.comp_info[0].v_samp_factor = 1;
- return CALLVJPEG(sp,jpeg_start_compress(&sp->cinfo.c,FALSE));
-# undef td
- }
-
-static int
-OJPEGPreEncode(register TIFF *tif,tsample_t s)
- { register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
-
- /* If we are about to write the first row of an image plane, which should
- coincide with a JPEG "scan", reset the JPEG Library's compressor. Otherwise
- let the compressor run "as is" and return a "success" status without further
- ado.
- */
- if ( (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip)
- % td->td_stripsperimage
- == 0
- )
- {
- if ( (sp->cinfo.c.comp_info[0].component_id = s) == 1)
- && sp->cinfo.c.jpeg_color_space == JCS_YCbCr
- )
- {
- sp->cinfo.c.comp_info[0].quant_tbl_no =
- sp->cinfo.c.comp_info[0].dc_tbl_no =
- sp->cinfo.c.comp_info[0].ac_tbl_no = 1;
- sp->cinfo.c.comp_info[0].h_samp_factor = sp->h_sampling;
- sp->cinfo.c.comp_info[0].v_samp_factor = sp->v_sampling;
-
- /* Scale expected strip/tile size to match a downsampled component. */
-
- sp->cinfo.c.image_width = TIFFhowmany(segment_width,sp->h_sampling);
- sp->cinfo.c.image_height=TIFFhowmany(segment_height,sp->v_sampling);
- };
- sp->scancount = 0; /* Mark subsampling buffer(s) empty */
- };
- return 1;
-# undef td
- }
-
-static int
-OJPEGPostEncode(register TIFF *tif)
- { register OJPEGState *sp = OJState(tif);
-
- /* Finish up at the end of a strip or tile. */
-
- if (sp->scancount > 0) /* emit partial buffer of down-sampled data */
- { JDIMENSION n;
-
-# ifdef C_LOSSLESS_SUPPORTED
- if ( sp->scancount < sp->cinfo.c.data_unit
- && sp->cinfo.c.num_components > 0
- )
-# else
- if (sp->scancount < DCTSIZE && sp->cinfo.c.num_components > 0)
-# endif
- { int ci = 0, /* Pad the data vertically */
-# ifdef C_LOSSLESS_SUPPORTED
- size = sp->cinfo.c.data_unit;
-# else
- size = DCTSIZE;
-# endif
- register jpeg_component_info *compptr = sp->cinfo.c.comp_info;
-
- do
-# ifdef C_LOSSLESS_SUPPORTED
- { tsize_t row_width = compptr->width_in_data_units
-# else
- tsize_t row_width = compptr->width_in_blocks
-# endif
- *size*sizeof(JSAMPLE);
- int ypos = sp->scancount*compptr->v_samp_factor;
-
- do _TIFFmemcpy( (tdata_t)sp->ds_buffer[ci][ypos]
- , (tdata_t)sp->ds_buffer[ci][ypos-1]
- , row_width
- );
- while (++ypos < compptr->v_samp_factor*size);
- }
- while (++compptr,++ci < sp->cinfo.c.num_components);
- };
- n = sp->cinfo.c.max_v_samp_factor*size;
- if (CALLJPEG(sp,-1,jpeg_write_raw_data(&sp->cinfo.c,sp->ds_buffer,n)) != n)
- return 0;
- };
- return CALLVJPEG(sp,jpeg_finish_compress(&sp->cinfo.c));
- }
-#endif /* never */
-
-/* JPEG Decoding begins here. */
-
-/*ARGSUSED*/ static int
-OJPEGDecode(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
- { tsize_t bytesperline = isTiled(tif)
- ? TIFFTileRowSize(tif)
- : tif->tif_scanlinesize,
- rows; /* No. of unprocessed rows in file */
- register OJPEGState *sp = OJState(tif);
-
- /* Decode a chunk of pixels, where the input data has not NOT been down-
- sampled, or else the TIFF Library's client has used the "JPEGColorMode" TIFF
- pseudo-tag to request that the JPEG Library do color-space conversion; this
- is the normal case. The data is expected to be read in scan-line multiples,
- and this subroutine is called for both pixel-interleaved and separate color
- planes.
-
- WARNING: Unlike "OJPEGDecodeRawContig()", below, the no. of Bytes in each
- decoded row is calculated here as "bytesperline" instead of
- using "sp->bytesperline", which might be a little smaller. This can
- occur for an old tiled image whose width isn't a multiple of 8 pixels.
- That's illegal according to the TIFF Version 6 specification, but some
- test files, like "zackthecat.tif", were built that way. In those cases,
- we want to embed the image's true width in our caller's buffer (which is
- presumably allocated according to the expected tile width) by
- effectively "padding" it with unused Bytes at the end of each row.
- */
- if ( (cc /= bytesperline) /* No. of complete rows in caller's buffer */
- > (rows = sp->cinfo.d.output_height - sp->cinfo.d.output_scanline)
- ) cc = rows;
- while (--cc >= 0)
- {
- if ( CALLJPEG(sp,-1,jpeg_read_scanlines(&sp->cinfo.d,(JSAMPARRAY)&buf,1))
- != 1
- ) return 0;
- buf += bytesperline;
- ++tif->tif_row;
- };
-
- /* BEWARE OF KLUDGE: If our input file was produced by Microsoft's Wang
- Imaging for Windows application, the DC coefficients of
- each JPEG image component (Y,Cb,Cr) must be reset at the end of each TIFF
- "strip", and any JPEG data bits remaining in the current Byte of the
- decoder's input buffer must be discarded. To do so, we create an "ad hoc"
- interface in the "jdhuff.c" module of IJG JPEG Library Version 6 (module
- "jdshuff.c", if Ken Murchison's lossless-Huffman patch is applied), and we
- invoke that interface here after decoding each "strip".
- */
- if (sp->is_WANG) jpeg_reset_huff_decode(&sp->cinfo.d);
- return 1;
- }
-
-/*ARGSUSED*/ static int
-OJPEGDecodeRawContig(register TIFF *tif,tidata_t buf,tsize_t cc,tsample_t s)
- { tsize_t rows; /* No. of unprocessed rows in file */
- JDIMENSION lines_per_MCU, size;
- register OJPEGState *sp = OJState(tif);
-
- /* Decode a chunk of pixels, where the input data has pixel-interleaved color
- planes, some of which have been down-sampled, but the TIFF Library's client
- has NOT used the "JPEGColorMode" TIFF pseudo-tag to request that the JPEG
- Library do color-space conversion. In other words, we must up-sample/
- expand/duplicate image components according to the image's sampling factors,
- without changing its color space. The data is expected to be read in scan-
- line multiples.
- */
- if ( (cc /= sp->bytesperline) /* No. of complete rows in caller's buffer */
- > (rows = sp->cinfo.d.output_height - sp->cinfo.d.output_scanline)
- ) cc = rows;
- lines_per_MCU = sp->cinfo.d.max_v_samp_factor
-# ifdef D_LOSSLESS_SUPPORTED
- * (size = sp->cinfo.d.min_codec_data_unit);
-# else
- * (size = DCTSIZE);
-# endif
- while (--cc >= 0)
- { int clumpoffset, ci;
- register jpeg_component_info *compptr;
-
- if (sp->scancount >= size) /* reload downsampled-data buffers */
- {
- if ( CALLJPEG(sp,-1,jpeg_read_raw_data(&sp->cinfo.d,sp->ds_buffer,lines_per_MCU))
- != lines_per_MCU
- ) return 0;
- sp->scancount = 0;
- };
-
- /* The fastest way to separate the data is: make 1 pass over the scan
- line for each row of each component.
- */
- clumpoffset = ci = 0;
- compptr = sp->cinfo.d.comp_info;
- do
- { int ypos = 0;
-
- if (compptr->h_samp_factor == 1) /* fast path */
- do
- { register JSAMPLE *inptr =
- sp->ds_buffer[ci][sp->scancount*compptr->v_samp_factor+ypos],
- *outptr = (JSAMPLE *)buf + clumpoffset;
- register int clumps_per_line = compptr->downsampled_width;
-
- do *outptr = *inptr++;
- while ((outptr += sp->samplesperclump),--clumps_per_line > 0);
- }
- while ( (clumpoffset += compptr->h_samp_factor)
- , ++ypos < compptr->v_samp_factor
- );
- else /* general case */
- do
- { register JSAMPLE *inptr =
- sp->ds_buffer[ci][sp->scancount*compptr->v_samp_factor+ypos],
- *outptr = (JSAMPLE *)buf + clumpoffset;
- register int clumps_per_line = compptr->downsampled_width;
-
- do
- { register int xpos = 0;
-
- do outptr[xpos] = *inptr++;
- while (++xpos < compptr->h_samp_factor);
- }
- while ((outptr += sp->samplesperclump),--clumps_per_line > 0);
- }
- while ( (clumpoffset += compptr->h_samp_factor)
- , ++ypos < compptr->v_samp_factor
- );
- }
- while (++compptr,++ci < sp->cinfo.d.num_components);
- ++sp->scancount;
- buf += sp->bytesperline;
- ++tif->tif_row;
- };
-
- /* BEWARE OF KLUDGE: If our input file was produced by Microsoft's Wang
- Imaging for Windows application, the DC coefficients of
- each JPEG image component (Y,Cb,Cr) must be reset at the end of each TIFF
- "strip", and any JPEG data bits remaining in the current Byte of the
- decoder's input buffer must be discarded. To do so, we create an "ad hoc"
- interface in the "jdhuff.c" module of IJG JPEG Library Version 6 (module
- "jdshuff.c", if Ken Murchison's lossless-Huffman patch is applied), and we
- invoke that interface here after decoding each "strip".
- */
- if (sp->is_WANG) jpeg_reset_huff_decode(&sp->cinfo.d);
- return 1;
- }
-
-/*ARGSUSED*/ static int
-OJPEGDecodeRawSeparate(TIFF *tif,register tidata_t buf,tsize_t cc,tsample_t s)
- { tsize_t rows; /* No. of unprocessed rows in file */
- JDIMENSION lines_per_MCU,
- size, /* ...of MCU */
- v; /* Component's vertical up-sampling ratio */
- register OJPEGState *sp = OJState(tif);
- register jpeg_component_info *compptr = sp->cinfo.d.comp_info + s;
-
- /* Decode a chunk of pixels, where the input data has separate color planes,
- some of which have been down-sampled, but the TIFF Library's client has NOT
- used the "JPEGColorMode" TIFF pseudo-tag to request that the JPEG Library
- do color-space conversion. The data is expected to be read in scan-line
- multiples.
- */
- v = sp->cinfo.d.max_v_samp_factor/compptr->v_samp_factor;
- if ( (cc /= compptr->downsampled_width) /* No. of rows in caller's buffer */
- > (rows = (sp->cinfo.d.output_height-sp->cinfo.d.output_scanline+v-1)/v)
- ) cc = rows; /* No. of rows of "clumps" to read */
- lines_per_MCU = sp->cinfo.d.max_v_samp_factor
-# ifdef D_LOSSLESS_SUPPORTED
- * (size = sp->cinfo.d.min_codec_data_unit);
-# else
- * (size = DCTSIZE);
-# endif
- L: if (sp->scancount >= size) /* reload downsampled-data buffers */
- {
- if ( CALLJPEG(sp,-1,jpeg_read_raw_data(&sp->cinfo.d,sp->ds_buffer,lines_per_MCU))
- != lines_per_MCU
- ) return 0;
- sp->scancount = 0;
- };
- rows = 0;
- do
- { register JSAMPLE *inptr =
- sp->ds_buffer[s][sp->scancount*compptr->v_samp_factor + rows];
- register int clumps_per_line = compptr->downsampled_width;
-
- do *buf++ = *inptr++; while (--clumps_per_line > 0); /* Copy scanline */
- tif->tif_row += v;
- if (--cc <= 0) return 1; /* End of caller's buffer? */
- }
- while (++rows < compptr->v_samp_factor);
- ++sp->scancount;
- goto L;
- }
-
-/* "OJPEGSetupDecode()" temporarily forces the JPEG Library to use the following
- subroutine as a "dummy" input reader in order to fool the library into
- thinking that it has read the image's first "Start of Scan" (SOS) marker, so
- that it initializes accordingly.
-*/
-/*ARGSUSED*/ METHODDEF(int)
-fake_SOS_marker(j_decompress_ptr cinfo){return JPEG_REACHED_SOS;}
-
-/*ARGSUSED*/ METHODDEF(int)
-suspend(j_decompress_ptr cinfo){return JPEG_SUSPENDED;}
-
-/* The JPEG Library's "null" color-space converter actually re-packs separate
- color planes (it's native image representation) into a pixel-interleaved,
- contiguous plane. But if our TIFF Library client is tryng to process a
- PLANARCONFIG_SEPARATE image, we don't want that; so here are modifications of
- code in the JPEG Library's "jdcolor.c" file, which simply copy Bytes to a
- color plane specified by the current JPEG "scan".
-*/
-METHODDEF(void)
-ycc_rgb_convert(register j_decompress_ptr cinfo,JSAMPIMAGE in,JDIMENSION row,
- register JSAMPARRAY out,register int nrows)
- { typedef struct /* "jdcolor.c" color-space conversion state */
- {
-
- /* WARNING: This declaration is ugly and dangerous! It's supposed to be
- private to the JPEG Library's "jdcolor.c" module, but we also
- need it here. Since the library's copy might change without notice, be
- sure to keep this one synchronized or the following code will break!
- */
- struct jpeg_color_deconverter pub; /* Public fields */
- /* Private state for YCC->RGB conversion */
- int *Cr_r_tab, /* ->Cr to R conversion table */
- *Cb_b_tab; /* ->Cb to B conversion table */
- INT32 *Cr_g_tab, /* ->Cr to G conversion table */
- *Cb_g_tab; /* ->Cb to G conversion table */
- } *my_cconvert_ptr;
- my_cconvert_ptr cconvert = (my_cconvert_ptr)cinfo->cconvert;
- JSAMPARRAY irow0p = in[0] + row;
- register JSAMPLE *range_limit = cinfo->sample_range_limit;
- register JSAMPROW outp, Y;
-
- switch (cinfo->output_scan_number - 1)
- { JSAMPARRAY irow1p, irow2p;
- register INT32 *table0, *table1;
- SHIFT_TEMPS
-
- case RGB_RED : irow2p = in[2] + row;
- table0 = (INT32 *)cconvert->Cr_r_tab;
- while (--nrows >= 0)
- { register JSAMPROW Cr = *irow2p++;
- register int i = cinfo->output_width;
-
- Y = *irow0p++;
- outp = *out++;
- while (--i >= 0)
- *outp++ = range_limit[*Y++ + table0[*Cr++]];
- };
- return;
- case RGB_GREEN: irow1p = in[1] + row;
- irow2p = in[2] + row;
- table0 = cconvert->Cb_g_tab;
- table1 = cconvert->Cr_g_tab;
- while (--nrows >= 0)
- { register JSAMPROW Cb = *irow1p++,
- Cr = *irow2p++;
- register int i = cinfo->output_width;
-
- Y = *irow0p++;
- outp = *out++;
- while (--i >= 0)
- *outp++ =
- range_limit[ *Y++
- + RIGHT_SHIFT(table0[*Cb++]+table1[*Cr++],16)
- ];
- };
- return;
- case RGB_BLUE : irow1p = in[1] + row;
- table0 = (INT32 *)cconvert->Cb_b_tab;
- while (--nrows >= 0)
- { register JSAMPROW Cb = *irow1p++;
- register int i = cinfo->output_width;
-
- Y = *irow0p++;
- outp = *out++;
- while (--i >= 0)
- *outp++ = range_limit[*Y++ + table0[*Cb++]];
- }
- }
- }
-
-METHODDEF(void)
-null_convert(register j_decompress_ptr cinfo,JSAMPIMAGE in,JDIMENSION row,
- register JSAMPARRAY out,register int nrows)
- { register JSAMPARRAY irowp = in[cinfo->output_scan_number - 1] + row;
-
- while (--nrows >= 0) _TIFFmemcpy(*out++,*irowp++,cinfo->output_width);
- }
-
-static int
-OJPEGSetupDecode(register TIFF *tif)
- { static char module[]={"OJPEGSetupDecode"};
- J_COLOR_SPACE jpeg_color_space, /* Color space of JPEG-compressed image */
- out_color_space; /* Color space of decompressed image */
- uint32 segment_width;
- int status = 1; /* Assume success by default */
- boolean downsampled_output=FALSE, /* <=> Want JPEG Library's "raw" image? */
- is_JFIF; /* <=> JFIF image? */
- register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
-
- /* Verify miscellaneous parameters. This will need work if the TIFF Library
- ever supports different depths for different components, or if the JPEG
- Library ever supports run-time depth selection. Neither seems imminent.
- */
- if (td->td_bitspersample != sp->cinfo.d.data_precision)
- {
- TIFFError(module,bad_bps,td->td_bitspersample);
- status = 0;
- };
-
- /* The TIFF Version 6.0 specification and IJG JPEG Library accept different
- sets of color spaces, so verify that our image belongs to the common subset
- and map its photometry code, then initialize to handle subsampling and
- optional JPEG Library YCbCr <-> RGB color-space conversion.
- */
- switch (td->td_photometric)
- {
- case PHOTOMETRIC_YCBCR :
-
- /* ISO IS 10918-1 requires that JPEG subsampling factors be 1-4, but
- TIFF Version 6.0 is more restrictive: only 1, 2, and 4 are allowed.
- */
- if ( ( td->td_ycbcrsubsampling[0] == 1
- || td->td_ycbcrsubsampling[0] == 2
- || td->td_ycbcrsubsampling[0] == 4
- )
- && ( td->td_ycbcrsubsampling[1] == 1
- || td->td_ycbcrsubsampling[1] == 2
- || td->td_ycbcrsubsampling[1] == 4
- )
- )
- downsampled_output =
- (
- (sp->h_sampling = td->td_ycbcrsubsampling[0]) << 3
- | (sp->v_sampling = td->td_ycbcrsubsampling[1])
- ) != 011;
- else
- {
- TIFFError(module,bad_subsampling);
- status = 0;
- };
- jpeg_color_space = JCS_YCbCr;
- if (sp->jpegcolormode == JPEGCOLORMODE_RGB)
- {
- downsampled_output = FALSE;
- out_color_space = JCS_RGB;
- break;
- };
- goto L2;
- case PHOTOMETRIC_MINISBLACK:
- jpeg_color_space = JCS_GRAYSCALE;
- goto L1;
- case PHOTOMETRIC_RGB :
- jpeg_color_space = JCS_RGB;
- goto L1;
- case PHOTOMETRIC_SEPARATED :
- jpeg_color_space = JCS_CMYK;
- L1: sp->jpegcolormode = JPEGCOLORMODE_RAW; /* No JPEG Lib. conversion */
- L2: out_color_space = jpeg_color_space;
- break;
- default :
- TIFFError(module,bad_photometry,td->td_photometric);
- status = 0;
- };
- if (status == 0) return 0; /* If TIFF errors, don't bother to continue */
-
- /* Set parameters that are same for all strips/tiles. */
-
- sp->cinfo.d.src = &sp->src;
- sp->src.init_source = std_init_source;
- sp->src.fill_input_buffer = std_fill_input_buffer;
- sp->src.skip_input_data = std_skip_input_data;
- sp->src.resync_to_restart = jpeg_resync_to_restart;
- sp->src.term_source = std_term_source;
-
- /* BOGOSITY ALERT! The Wang Imaging application for Microsoft Windows produces
- images containing "JPEGInterchangeFormat[Length]" TIFF
- records that resemble JFIF-in-TIFF encapsulations but, in fact, violate the
- TIFF Version 6 specification in several ways; nevertheless, we try to handle
- them gracefully because there are apparently a lot of them around. The
- purported "JFIF" data stream in one of these files vaguely resembles a JPEG
- "tables only" data stream, except that there's no trailing EOI marker. The
- rest of the JPEG data stream lies in a discontiguous file region, identified
- by the 0th Strip offset (which is *also* illegal!), where it begins with an
- SOS marker and apparently continues to the end of the file. There is no
- trailing EOI marker here, either.
- */
- is_JFIF = !sp->is_WANG && TIFFFieldSet(tif,FIELD_JPEGIFOFFSET);
-
- /* Initialize decompression parameters that won't be overridden by JPEG Library
- defaults set during the "jpeg_read_header()" call, below.
- */
- segment_width = td->td_imagewidth;
- if (isTiled(tif))
- {
- if (sp->is_WANG) /* we don't know how to handle it */
- {
- TIFFError(module,"Tiled Wang image not supported");
- return 0;
- };
-
- /* BOGOSITY ALERT! "TIFFTileRowSize()" seems to work fine for modern JPEG-
- in-TIFF encapsulations where the image width--like the
- tile width--is a multiple of 8 or 16 pixels. But image widths and
- heights are aren't restricted to 8- or 16-bit multiples, and we need
- the exact Byte count of decompressed scan lines when we call the JPEG
- Library. At least one old file ("zackthecat.tif") in the TIFF Library
- test suite has widths and heights slightly less than the tile sizes, and
- it apparently used the bogus computation below to determine the number
- of Bytes per scan line (was this due to an old, broken version of
- "TIFFhowmany()"?). Before we get here, "OJPEGSetupDecode()" verified
- that our image uses 8-bit samples, so the following check appears to
- return the correct answer in all known cases tested to date.
- */
- if (is_JFIF || (segment_width & 7) == 0)
- sp->bytesperline = TIFFTileRowSize(tif); /* Normal case */
- else
- {
- /* Was the file-encoder's segment-width calculation bogus? */
- segment_width = (segment_width/sp->h_sampling + 1) * sp->h_sampling;
- sp->bytesperline = segment_width * td->td_samplesperpixel;
- }
- }
- else sp->bytesperline = TIFFVStripSize(tif,1);
-
- /* BEWARE OF KLUDGE: If we have JPEG Interchange File Format (JFIF) image,
- then we want to read "metadata" in the bit-stream's
- header and validate it against corresponding information in TIFF records.
- But if we have a *really old* JPEG file that's not JFIF, then we simply
- assign TIFF-record values to JPEG Library variables without checking.
- */
- if (is_JFIF) /* JFIF image */
- { unsigned char *end_of_data;
- int subsampling_factors;
- register unsigned char *p;
- register int i;
-
- /* WARNING: Although the image file contains a JFIF bit stream, it might
- also contain some old TIFF records causing "OJPEGVSetField()"
- to have allocated quantization or Huffman decoding tables. But when the
- JPEG Library reads and parses the JFIF header below, it reallocate these
- tables anew without checking for "dangling" pointers, thereby causing a
- memory "leak". We have enough information to potentially deallocate the
- old tables here, but unfortunately JPEG Library Version 6B uses a "pool"
- allocator for small objects, with no deallocation procedure; instead, it
- reclaims a whole pool when an image is closed/destroyed, so well-behaved
- TIFF client applications (i.e., those which close their JPEG images as
- soon as they're no longer needed) will waste memory for a short time but
- recover it eventually. But ill-behaved TIFF clients (i.e., those which
- keep many JPEG images open gratuitously) can exhaust memory prematurely.
- If the JPEG Library ever implements a deallocation procedure, insert
- this clean-up code:
- */
-# ifdef someday
- if (sp->jpegtablesmode & JPEGTABLESMODE_QUANT) /* free quant. tables */
- { register int i = 0;
-
- do
- { register JQUANT_TBL *q;
-
- if (q = sp->cinfo.d.quant_tbl_ptrs[i])
- {
- jpeg_free_small(&sp->cinfo.comm,q,sizeof *q);
- sp->cinfo.d.quant_tbl_ptrs[i] = 0;
- }
- }
- while (++i < NUM_QUANT_TBLS);
- };
- if (sp->jpegtablesmode & JPEGTABLESMODE_HUFF) /* free Huffman tables */
- { register int i = 0;
-
- do
- { register JHUFF_TBL *h;
-
- if (h = sp->cinfo.d.dc_huff_tbl_ptrs[i])
- {
- jpeg_free_small(&sp->cinfo.comm,h,sizeof *h);
- sp->cinfo.d.dc_huff_tbl_ptrs[i] = 0;
- };
- if (h = sp->cinfo.d.ac_huff_tbl_ptrs[i])
- {
- jpeg_free_small(&sp->cinfo.comm,h,sizeof *h);
- sp->cinfo.d.ac_huff_tbl_ptrs[i] = 0;
- }
- }
- while (++i < NUM_HUFF_TBLS);
- };
-# endif /* someday */
-
- /* Since we might someday wish to try rewriting "old format" JPEG-in-TIFF
- encapsulations in "new format" files, try to synthesize the value of a
- modern "JPEGTables" TIFF record by scanning the JPEG data from just past
- the "Start of Information" (SOI) marker until something other than a
- legitimate "table" marker is found, as defined in ISO IS 10918-1
- Appending B.2.4; namely:
-
- -- Define Quantization Table (DQT)
- -- Define Huffman Table (DHT)
- -- Define Arithmetic Coding table (DAC)
- -- Define Restart Interval (DRI)
- -- Comment (COM)
- -- Application data (APPn)
-
- For convenience, we also accept "Expansion" (EXP) markers, although they
- are apparently not a part of normal "table" data.
- */
- sp->jpegtables = p = (unsigned char *)sp->src.next_input_byte;
- end_of_data = p + sp->src.bytes_in_buffer;
- p += 2;
- while (p < end_of_data && p[0] == 0xFF)
- switch (p[1])
- {
- default : goto L;
- case 0xC0: /* SOF0 */
- case 0xC1: /* SOF1 */
- case 0xC2: /* SOF2 */
- case 0xC3: /* SOF3 */
- case 0xC4: /* DHT */
- case 0xC5: /* SOF5 */
- case 0xC6: /* SOF6 */
- case 0xC7: /* SOF7 */
- case 0xC9: /* SOF9 */
- case 0xCA: /* SOF10 */
- case 0xCB: /* SOF11 */
- case 0xCC: /* DAC */
- case 0xCD: /* SOF13 */
- case 0xCE: /* SOF14 */
- case 0xCF: /* SOF15 */
- case 0xDB: /* DQT */
- case 0xDD: /* DRI */
- case 0xDF: /* EXP */
- case 0xE0: /* APP0 */
- case 0xE1: /* APP1 */
- case 0xE2: /* APP2 */
- case 0xE3: /* APP3 */
- case 0xE4: /* APP4 */
- case 0xE5: /* APP5 */
- case 0xE6: /* APP6 */
- case 0xE7: /* APP7 */
- case 0xE8: /* APP8 */
- case 0xE9: /* APP9 */
- case 0xEA: /* APP10 */
- case 0xEB: /* APP11 */
- case 0xEC: /* APP12 */
- case 0xED: /* APP13 */
- case 0xEE: /* APP14 */
- case 0xEF: /* APP15 */
- case 0xFE: /* COM */
- p += (p[2] << 8 | p[3]) + 2;
- };
- L: if (p - (unsigned char *)sp->jpegtables > 2) /* fake "JPEGTables" */
- {
-
- /* In case our client application asks, pretend that this image file
- contains a modern "JPEGTables" TIFF record by copying to a buffer
- the initial part of the JFIF bit-stream that we just scanned, from
- the SOI marker through the "metadata" tables, then append an EOI
- marker and flag the "JPEGTables" TIFF record as "present".
- */
- sp->jpegtables_length = p - (unsigned char*)sp->jpegtables + 2;
- p = sp->jpegtables;
- if (!(sp->jpegtables = _TIFFmalloc(sp->jpegtables_length)))
- {
- TIFFError(module,no_jtable_space);
- return 0;
- };
- _TIFFmemcpy(sp->jpegtables,p,sp->jpegtables_length-2);
- p = (unsigned char *)sp->jpegtables + sp->jpegtables_length;
- p[-2] = 0xFF; p[-1] = JPEG_EOI; /* Append EOI marker */
- TIFFSetFieldBit(tif,FIELD_JPEGTABLES);
- tif->tif_flags |= TIFF_DIRTYDIRECT;
- }
- else sp->jpegtables = 0; /* Don't simulate "JPEGTables" */
- if ( CALLJPEG(sp,-1,jpeg_read_header(&sp->cinfo.d,TRUE))
- != JPEG_HEADER_OK
- ) return 0;
- if ( sp->cinfo.d.image_width != segment_width
- || sp->cinfo.d.image_height != td->td_imagelength
- )
- {
- TIFFError(module,"Improper JPEG strip/tile size");
- return 0;
- };
- if (sp->cinfo.d.num_components != td->td_samplesperpixel)
- {
- TIFFError(module,"Improper JPEG component count");
- return 0;
- };
- if (sp->cinfo.d.data_precision != td->td_bitspersample)
- {
- TIFFError(module,"Improper JPEG data precision");
- return 0;
- };
-
- /* Check that JPEG image components all have the same subsampling factors
- declared (or defaulted) in the TIFF file, since TIFF Version 6.0 is more
- restrictive than JPEG: Only the 0th component may have horizontal and
- vertical subsampling factors other than <1,1>.
- */
- subsampling_factors = sp->h_sampling << 3 | sp->v_sampling;
- i = 0;
- do
- {
- if ( ( sp->cinfo.d.comp_info[i].h_samp_factor << 3
- | sp->cinfo.d.comp_info[i].v_samp_factor
- )
- != subsampling_factors
- )
- {
- TIFFError(module,"Improper JPEG subsampling factors");
- return 0;
- };
- subsampling_factors = 011; /* Required for image components > 0 */
- }
- while (++i < sp->cinfo.d.num_components);
- }
- else /* not JFIF image */
- { int (*save)(j_decompress_ptr cinfo) = sp->cinfo.d.marker->read_markers;
- register int i;
-
- /* We're not assuming that this file's JPEG bit stream has any header
- "metadata", so fool the JPEG Library into thinking that we read a
- "Start of Input" (SOI) marker and a "Start of Frame" (SOFx) marker, then
- force it to read a simulated "Start of Scan" (SOS) marker when we call
- "jpeg_read_header()" below. This should cause the JPEG Library to
- establish reasonable defaults.
- */
- sp->cinfo.d.marker->saw_SOI = /* Pretend we saw SOI marker */
- sp->cinfo.d.marker->saw_SOF = TRUE; /* Pretend we saw SOF marker */
- sp->cinfo.d.marker->read_markers =
- sp->is_WANG ? suspend : fake_SOS_marker;
- sp->cinfo.d.global_state = DSTATE_INHEADER;
- sp->cinfo.d.Se = DCTSIZE2-1; /* Suppress JPEG Library warning */
- sp->cinfo.d.image_width = segment_width;
- sp->cinfo.d.image_height = td->td_imagelength;
-
- /* The following color-space initialization, including the complicated
- "switch"-statement below, essentially duplicates the logic used by the
- JPEG Library's "jpeg_init_colorspace()" subroutine during compression.
- */
- sp->cinfo.d.num_components = td->td_samplesperpixel;
- sp->cinfo.d.comp_info = (jpeg_component_info *)
- (*sp->cinfo.d.mem->alloc_small)
- ( &sp->cinfo.comm
- , JPOOL_IMAGE
- , sp->cinfo.d.num_components * sizeof *sp->cinfo.d.comp_info
- );
- i = 0;
- do
- {
- sp->cinfo.d.comp_info[i].component_index = i;
- sp->cinfo.d.comp_info[i].component_needed = TRUE;
- sp->cinfo.d.cur_comp_info[i] = &sp->cinfo.d.comp_info[i];
- }
- while (++i < sp->cinfo.d.num_components);
- switch (jpeg_color_space)
- {
- case JCS_UNKNOWN :
- i = 0;
- do
- {
- sp->cinfo.d.comp_info[i].component_id = i;
- sp->cinfo.d.comp_info[i].h_samp_factor =
- sp->cinfo.d.comp_info[i].v_samp_factor = 1;
- }
- while (++i < sp->cinfo.d.num_components);
- break;
- case JCS_GRAYSCALE:
- sp->cinfo.d.comp_info[0].component_id =
- sp->cinfo.d.comp_info[0].h_samp_factor =
- sp->cinfo.d.comp_info[0].v_samp_factor = 1;
- break;
- case JCS_RGB :
- sp->cinfo.d.comp_info[0].component_id = 'R';
- sp->cinfo.d.comp_info[1].component_id = 'G';
- sp->cinfo.d.comp_info[2].component_id = 'B';
- i = 0;
- do sp->cinfo.d.comp_info[i].h_samp_factor =
- sp->cinfo.d.comp_info[i].v_samp_factor = 1;
- while (++i < sp->cinfo.d.num_components);
- break;
- case JCS_CMYK :
- sp->cinfo.d.comp_info[0].component_id = 'C';
- sp->cinfo.d.comp_info[1].component_id = 'M';
- sp->cinfo.d.comp_info[2].component_id = 'Y';
- sp->cinfo.d.comp_info[3].component_id = 'K';
- i = 0;
- do sp->cinfo.d.comp_info[i].h_samp_factor =
- sp->cinfo.d.comp_info[i].v_samp_factor = 1;
- while (++i < sp->cinfo.d.num_components);
- break;
- case JCS_YCbCr :
- i = 0;
- do
- {
- sp->cinfo.d.comp_info[i].component_id = i+1;
- sp->cinfo.d.comp_info[i].h_samp_factor =
- sp->cinfo.d.comp_info[i].v_samp_factor = 1;
- sp->cinfo.d.comp_info[i].quant_tbl_no =
- sp->cinfo.d.comp_info[i].dc_tbl_no =
- sp->cinfo.d.comp_info[i].ac_tbl_no = i > 0;
- }
- while (++i < sp->cinfo.d.num_components);
- sp->cinfo.d.comp_info[0].h_samp_factor = sp->h_sampling;
- sp->cinfo.d.comp_info[0].v_samp_factor = sp->v_sampling;
- };
- sp->cinfo.d.comps_in_scan = td->td_planarconfig == PLANARCONFIG_CONTIG
- ? sp->cinfo.d.num_components
- : 1;
- i = CALLJPEG(sp,-1,jpeg_read_header(&sp->cinfo.d,!sp->is_WANG));
- sp->cinfo.d.marker->read_markers = save; /* Restore input method */
- if (sp->is_WANG) /* produced by Wang Imaging on Microsoft Windows */
- {
- if (i != JPEG_SUSPENDED) return 0;
-
- /* BOGOSITY ALERT! Files prooduced by the Wang Imaging application for
- Microsoft Windows are a special--and, technically
- illegal--case. A JPEG SOS marker and rest of the data stream should
- be located at the end of the file, in a position identified by the
- 0th Strip offset.
- */
- i = td->td_nstrips - 1;
- sp->src.next_input_byte = tif->tif_base + td->td_stripoffset[0];
- sp->src.bytes_in_buffer = td->td_stripoffset[i] -
- td->td_stripoffset[0] + td->td_stripbytecount[i];
- i = CALLJPEG(sp,-1,jpeg_read_header(&sp->cinfo.d,TRUE));
- };
- if (i != JPEG_HEADER_OK) return 0;
- };
-
- /* Some of our initialization must wait until the JPEG Library is initialized
- above, in order to override its defaults.
- */
- if ( (sp->cinfo.d.raw_data_out = downsampled_output)
- && !alloc_downsampled_buffers(tif,sp->cinfo.d.comp_info,
- sp->cinfo.d.num_components)
- ) return 0;
- sp->cinfo.d.jpeg_color_space = jpeg_color_space;
- sp->cinfo.d.out_color_space = out_color_space;
- sp->cinfo.d.dither_mode = JDITHER_NONE; /* Reduce image "noise" */
- sp->cinfo.d.two_pass_quantize = FALSE;
-
- /* If the image consists of separate, discontiguous TIFF "samples" (= color
- planes, hopefully = JPEG "scans"), then we must use the JPEG Library's
- "buffered image" mode to decompress the entire image into temporary buffers,
- because the JPEG Library must parse the entire JPEG bit-stream in order to
- be satsified that it has a complete set of color components for each pixel,
- but the TIFF Library must allow our client to extract 1 component at a time.
- Initializing the JPEG Library's "buffered image" mode is tricky: First, we
- start its decompressor, then we tell the decompressor to "consume" (i.e.,
- buffer) the entire bit-stream.
-
- WARNING: Disabling "fancy" up-sampling seems to slightly reduce "noise" for
- certain old Wang Imaging files, but it absolutely *must* be
- enabled if the image has separate color planes, since in that case, the JPEG
- Library doesn't use an "sp->cinfo.d.cconvert" structure (so de-referencing
- this pointer below will cause a fatal crash) but writing our own code to up-
- sample separate color planes is too much work for right now. Maybe someday?
- */
- sp->cinfo.d.do_fancy_upsampling = /* Always let this default (to TRUE)? */
- sp->cinfo.d.buffered_image = td->td_planarconfig == PLANARCONFIG_SEPARATE;
- if (!CALLJPEG(sp,0,jpeg_start_decompress(&sp->cinfo.d))) return 0;
- if (sp->cinfo.d.buffered_image) /* separate color planes */
- {
- if (sp->cinfo.d.raw_data_out)
- tif->tif_decoderow = tif->tif_decodestrip = tif->tif_decodetile =
- OJPEGDecodeRawSeparate;
- else
- {
- tif->tif_decoderow = tif->tif_decodestrip = tif->tif_decodetile =
- OJPEGDecode;
-
- /* In JPEG Library Version 6B, color-space conversion isn't implemented
- for separate color planes, so we must do it ourself if our TIFF
- client doesn't want to:
- */
- sp->cinfo.d.cconvert->color_convert =
- sp->cinfo.d.jpeg_color_space == sp->cinfo.d.out_color_space
- ? null_convert : ycc_rgb_convert;
- };
- L3: switch (CALLJPEG(sp,0,jpeg_consume_input(&sp->cinfo.d)))
- {
- default : goto L3;
-
- /* If no JPEG "End of Information" (EOI) marker is found when bit-
- stream parsing ends, check whether we have enough data to proceed
- before reporting an error.
- */
- case JPEG_SUSPENDED : if ( sp->cinfo.d.input_scan_number
- *sp->cinfo.d.image_height
- + sp->cinfo.d.input_iMCU_row
- *sp->cinfo.d.max_v_samp_factor
-# ifdef D_LOSSLESS_SUPPORTED
- *sp->cinfo.d.data_units_in_MCU
- *sp->cinfo.d.min_codec_data_unit
-# else
- *sp->cinfo.d.blocks_in_MCU
- *DCTSIZE
-# endif
- < td->td_samplesperpixel
- *sp->cinfo.d.image_height
- )
- {
- TIFFError(tif->tif_name,
- "Premature end of JPEG bit-stream");
- return 0;
- }
- case JPEG_REACHED_EOI: ;
- }
- }
- else /* pixel-interleaved color planes */
- tif->tif_decoderow = tif->tif_decodestrip = tif->tif_decodetile =
- downsampled_output ? OJPEGDecodeRawContig : OJPEGDecode;
- return 1;
-# undef td
- }
-
-static int
-OJPEGPreDecode(register TIFF *tif,tsample_t s)
- { register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
-
- /* If we are about to read the first row of an image plane (hopefully, these
- are coincident with JPEG "scans"!), reset the JPEG Library's decompressor
- appropriately. Otherwise, let the decompressor run "as is" and return a
- "success" status without further ado.
- */
- if ( (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip)
- % td->td_stripsperimage
- == 0
- )
- {
- if ( sp->cinfo.d.buffered_image
- && !CALLJPEG(sp,0,jpeg_start_output(&sp->cinfo.d,s+1))
- ) return 0;
- sp->cinfo.d.output_scanline = 0;
-
- /* Mark subsampling buffers "empty". */
-
-# ifdef D_LOSSLESS_SUPPORTED
- sp->scancount = sp->cinfo.d.min_codec_data_unit;
-# else
- sp->scancount = DCTSIZE;
-# endif
- };
- return 1;
-# undef td
- }
-
-/*ARGSUSED*/ static void
-OJPEGPostDecode(register TIFF *tif,tidata_t buf,tsize_t cc)
- { register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
-
- /* The JPEG Library decompressor has reached the end of a strip/tile. If this
- is the end of a TIFF image "sample" (= JPEG "scan") in a file with separate
- components (color planes), then end the "scan". If it ends the image's last
- sample/scan, then also stop the JPEG Library's decompressor.
- */
- if (sp->cinfo.d.output_scanline >= sp->cinfo.d.output_height)
- {
- if (sp->cinfo.d.buffered_image)
- CALLJPEG(sp,-1,jpeg_finish_output(&sp->cinfo.d)); /* End JPEG scan */
- if ( (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip)
- >= td->td_nstrips-1
- ) CALLJPEG(sp,0,jpeg_finish_decompress(&sp->cinfo.d));
- }
-# undef td
- }
-
-static int
-OJPEGVSetField(register TIFF *tif,ttag_t tag,va_list ap)
-{
- uint32 v32;
- register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
- toff_t tiffoff=0;
- uint32 bufoff=0;
- uint32 code_count=0;
- int i2=0;
- int k2=0;
-
- switch (tag)
- {
-
- /* If a "ReferenceBlackWhite" TIFF tag appears in the file explicitly, undo
- any modified default definition that we might have installed below, then
- install the real one.
- */
- case TIFFTAG_REFERENCEBLACKWHITE : if (td->td_refblackwhite)
- {
- _TIFFfree(td->td_refblackwhite);
- td->td_refblackwhite = 0;
- };
- default : return
- (*sp->vsetparent)(tif,tag,ap);
-
- /* BEWARE OF KLUDGE: Some old-format JPEG-in-TIFF files, including those
- produced by the Wang Imaging application for Micro-
- soft Windows, illegally omit a "ReferenceBlackWhite" TIFF tag, even
- though the TIFF specification's default is intended for the RGB color
- space and is inappropriate for the YCbCr color space ordinarily used for
- JPEG images. Since many TIFF client applications request the value of
- this tag immediately after a TIFF image directory is parsed, and before
- any other code in this module receives control, we are forced to fix
- this problem very early in image-file processing. Fortunately, legal
- TIFF files are supposed to store their tags in numeric order, so a
- mandatory "PhotometricInterpretation" tag should always appear before
- an optional "ReferenceBlackWhite" tag. Hence, we slyly peek ahead when
- we discover the desired photometry, by installing modified black and
- white reference levels.
- */
- case TIFFTAG_PHOTOMETRIC :
- if ( (v32 = (*sp->vsetparent)(tif,tag,ap))
- && td->td_photometric == PHOTOMETRIC_YCBCR
- )
- {
- if ( (td->td_refblackwhite = _TIFFmalloc(6*sizeof(float))) )
- { register long top = 1 << td->td_bitspersample;
-
- td->td_refblackwhite[0] = 0;
- td->td_refblackwhite[1] = td->td_refblackwhite[3] =
- td->td_refblackwhite[5] = top - 1;
- td->td_refblackwhite[2] = td->td_refblackwhite[4] = top >> 1;
- }
- else
- {
- TIFFError(tif->tif_name,
- "Cannot set default reference black and white levels");
- v32 = 0;
- };
- }
- return v32;
-
- /* BEWARE OF KLUDGE: According to Charles Auer <Bumble731@msn.com>, if our
- input is a multi-image (multi-directory) JPEG-in-TIFF
- file is produced by the Wang Imaging application on Microsoft Windows,
- for some reason the first directory excludes the vendor-specific "WANG
- PageControl" tag (32934) that we check below, so the only other way to
- identify these directories is apparently to look for a software-
- identification tag with the substring, "Wang Labs". Single-image files
- can apparently pass both tests, which causes no harm here, but what a
- mess this is!
- */
- case TIFFTAG_SOFTWARE :
- {
- char *software;
-
- v32 = (*sp->vsetparent)(tif,tag,ap);
- if( TIFFGetField( tif, TIFFTAG_SOFTWARE, &software )
- && strstr( software, "Wang Labs" ) )
- sp->is_WANG = 1;
- return v32;
- }
-
- case TIFFTAG_JPEGPROC :
- case TIFFTAG_JPEGIFOFFSET :
- case TIFFTAG_JPEGIFBYTECOUNT :
- case TIFFTAG_JPEGRESTARTINTERVAL :
- case TIFFTAG_JPEGLOSSLESSPREDICTORS:
- case TIFFTAG_JPEGPOINTTRANSFORM :
- case TIFFTAG_JPEGQTABLES :
- case TIFFTAG_JPEGDCTABLES :
- case TIFFTAG_JPEGACTABLES :
- case TIFFTAG_WANG_PAGECONTROL :
- case TIFFTAG_JPEGCOLORMODE : ;
- };
- v32 = va_arg(ap,uint32); /* No. of values in this TIFF record */
-
- /* This switch statement is added for OJPEGVSetField */
- if(v32 !=0){
- switch(tag){
- case TIFFTAG_JPEGPROC:
- sp->jpegproc=v32;
- break;
- case TIFFTAG_JPEGIFOFFSET:
- sp->jpegifoffset=v32;
- break;
- case TIFFTAG_JPEGIFBYTECOUNT:
- sp->jpegifbytecount=v32;
- break;
- case TIFFTAG_JPEGRESTARTINTERVAL:
- sp->jpegrestartinterval=v32;
- break;
- case TIFFTAG_JPEGLOSSLESSPREDICTORS:
- sp->jpeglosslesspredictors_length=v32;
- break;
- case TIFFTAG_JPEGPOINTTRANSFORM:
- sp->jpegpointtransform_length=v32;
- break;
- case TIFFTAG_JPEGQTABLES:
- sp->jpegqtables_length=v32;
- break;
- case TIFFTAG_JPEGACTABLES:
- sp->jpegactables_length=v32;
- break;
- case TIFFTAG_JPEGDCTABLES:
- sp->jpegdctables_length=v32;
- break;
- default:
- break;
- }
- }
-
- /* BEWARE: The following actions apply only if we are reading a "source" TIFF
- image to be decompressed for a client application program. If we
- ever enhance this file's CODEC to write "destination" JPEG-in-TIFF images,
- we'll need an "if"- and another "switch"-statement below, because we'll
- probably want to store these records' values in some different places. Most
- of these need not be parsed here in order to decode JPEG bit stream, so we
- set boolean flags to note that they have been seen, but we otherwise ignore
- them.
- */
- switch (tag)
- { JHUFF_TBL **h;
-
- /* Validate the JPEG-process code. */
-
- case TIFFTAG_JPEGPROC :
- switch (v32)
- {
- default : TIFFError(tif->tif_name,
- "Unknown JPEG process");
- return 0;
-# ifdef C_LOSSLESS_SUPPORTED
-
- /* Image uses (lossy) baseline sequential coding. */
-
- case JPEGPROC_BASELINE: sp->cinfo.d.process = JPROC_SEQUENTIAL;
- sp->cinfo.d.data_unit = DCTSIZE;
- break;
-
- /* Image uses (lossless) Huffman coding. */
-
- case JPEGPROC_LOSSLESS: sp->cinfo.d.process = JPROC_LOSSLESS;
- sp->cinfo.d.data_unit = 1;
-# else /* not C_LOSSLESS_SUPPORTED */
- case JPEGPROC_LOSSLESS: TIFFError(JPEGLib_name,
- "Does not support lossless Huffman coding");
- return 0;
- case JPEGPROC_BASELINE: ;
-# endif /* C_LOSSLESS_SUPPORTED */
- };
- break;
-
- /* The TIFF Version 6.0 specification says that if the value of a TIFF
- "JPEGInterchangeFormat" record is 0, then we are to behave as if this
- record were absent; i.e., the data does *not* represent a JPEG Inter-
- change Format File (JFIF), so don't even set the boolean "I've been
- here" flag below. Otherwise, the field's value represents the file
- offset of the JPEG SOI marker.
- */
- case TIFFTAG_JPEGIFOFFSET :
- if (v32)
- {
- sp->src.next_input_byte = tif->tif_base + v32;
- break;
- };
- return 1;
- case TIFFTAG_JPEGIFBYTECOUNT :
- sp->src.bytes_in_buffer = v32;
- break;
-
- /* The TIFF Version 6.0 specification says that if the JPEG "Restart"
- marker interval is 0, then the data has no "Restart" markers; i.e., we
- must behave as if this TIFF record were absent. So, don't even set the
- boolean "I've been here" flag below.
- */
- /*
- * Instead, set the field bit so TIFFGetField can get whether or not
- * it was set.
- */
- case TIFFTAG_JPEGRESTARTINTERVAL :
- if (v32)
- sp->cinfo.d.restart_interval = v32;
- break;
- /* The TIFF Version 6.0 specification says that this tag is supposed to be
- a vector containing a value for each image component, but for lossless
- Huffman coding (the only JPEG process defined by the specification for
- which this tag should be needed), ISO IS 10918-1 uses only a single
- value, equivalent to the "Ss" field in a JPEG bit-stream's "Start of
- Scan" (SOS) marker. So, we extract the first vector element and ignore
- the rest. (I hope this is correct!)
- */
- case TIFFTAG_JPEGLOSSLESSPREDICTORS:
- if (v32)
- {
- sp->cinfo.d.Ss = *va_arg(ap,uint16 *);
- sp->jpeglosslesspredictors =
- _TIFFmalloc(sp->jpeglosslesspredictors_length
- * sizeof(uint16));
- if(sp->jpeglosslesspredictors==NULL){return(0);}
- for(i2=0;i2<sp->jpeglosslesspredictors_length;i2++){
- ((uint16*)sp->jpeglosslesspredictors)[i2] =
- ((uint16*)sp->cinfo.d.Ss)[i2];
- }
- sp->jpeglosslesspredictors_length*=sizeof(uint16);
- break;
- };
- return v32;
-
- /* The TIFF Version 6.0 specification says that this tag is supposed to be
- a vector containing a value for each image component, but for lossless
- Huffman coding (the only JPEG process defined by the specification for
- which this tag should be needed), ISO IS 10918-1 uses only a single
- value, equivalent to the "Al" field in a JPEG bit-stream's "Start of
- Scan" (SOS) marker. So, we extract the first vector element and ignore
- the rest. (I hope this is correct!)
- */
- case TIFFTAG_JPEGPOINTTRANSFORM :
- if (v32)
- {
- sp->cinfo.d.Al = *va_arg(ap,uint16 *);
- sp->jpegpointtransform =
- _TIFFmalloc(sp->jpegpointtransform_length*sizeof(uint16));
- if(sp->jpegpointtransform==NULL){return(0);}
- for(i2=0;i2<sp->jpegpointtransform_length;i2++) {
- ((uint16*)sp->jpegpointtransform)[i2] =
- ((uint16*)sp->cinfo.d.Al)[i2];
- }
- sp->jpegpointtransform_length*=sizeof(uint16);
- break;
- }
- return v32;
-
- /* We have a vector of offsets to quantization tables, so load 'em! */
-
- case TIFFTAG_JPEGQTABLES :
- if (v32)
- { uint32 *v;
- int i;
- if (v32 > NUM_QUANT_TBLS)
- {
- TIFFError(tif->tif_name,"Too many quantization tables");
- return 0;
- };
- i = 0;
- v = va_arg(ap,uint32 *);
- sp->jpegqtables=_TIFFmalloc(64*sp->jpegqtables_length);
- if(sp->jpegqtables==NULL){return(0);}
- tiffoff = TIFFSeekFile(tif, 0, SEEK_CUR);
- bufoff=0;
- for(i2=0;i2<sp->jpegqtables_length;i2++){
- TIFFSeekFile(tif, v[i2], SEEK_SET);
- TIFFReadFile(tif, &(((unsigned char*)(sp->jpegqtables))[bufoff]),
- 64);
- bufoff+=64;
- }
- sp->jpegqtables_length=bufoff;
- TIFFSeekFile(tif, tiffoff, SEEK_SET);
-
- do /* read quantization table */
- { register UINT8 *from = tif->tif_base + *v++;
- register UINT16 *to;
- register int j = DCTSIZE2;
-
- if (!( sp->cinfo.d.quant_tbl_ptrs[i]
- = CALLJPEG(sp,0,jpeg_alloc_quant_table(&sp->cinfo.comm))
- )
- )
- {
- TIFFError(JPEGLib_name,"No space for quantization table");
- return 0;
- };
- to = sp->cinfo.d.quant_tbl_ptrs[i]->quantval;
- do *to++ = *from++; while (--j > 0);
- }
- while (++i < v32);
- sp->jpegtablesmode |= JPEGTABLESMODE_QUANT;
- };
- break;
-
- /* We have a vector of offsets to DC Huffman tables, so load 'em! */
-
- case TIFFTAG_JPEGDCTABLES :
- h = sp->cinfo.d.dc_huff_tbl_ptrs;
- goto L;
-
- /* We have a vector of offsets to AC Huffman tables, so load 'em! */
-
- case TIFFTAG_JPEGACTABLES :
- h = sp->cinfo.d.ac_huff_tbl_ptrs;
- L: if (v32)
- { uint32 *v;
- int i;
- if (v32 > NUM_HUFF_TBLS)
- {
- TIFFError(tif->tif_name,"Too many Huffman tables");
- return 0;
- };
- v = va_arg(ap,uint32 *);
- if(tag == TIFFTAG_JPEGDCTABLES) {
- sp->jpegdctables=_TIFFmalloc(272*sp->jpegdctables_length);
- if(sp->jpegdctables==NULL){return(0);}
- tiffoff = TIFFSeekFile(tif, 0, SEEK_CUR);
- bufoff=0;
- code_count=0;
- for(i2=0;i2<sp->jpegdctables_length;i2++){
- TIFFSeekFile(tif, v[i2], SEEK_SET);
- TIFFReadFile(tif,
- &(((unsigned char*)(sp->jpegdctables))[bufoff]),
- 16);
- code_count=0;
- for(k2=0;k2<16;k2++){
- code_count+=((unsigned char*)(sp->jpegdctables))[k2+bufoff];
- }
- TIFFReadFile(tif,
- &(((unsigned char*)(sp->jpegdctables))[bufoff+16]),
- code_count);
- bufoff+=16;
- bufoff+=code_count;
- }
- sp->jpegdctables_length=bufoff;
- TIFFSeekFile(tif, tiffoff, SEEK_SET);
- }
- if(tag==TIFFTAG_JPEGACTABLES){
- sp->jpegactables=_TIFFmalloc(272*sp->jpegactables_length);
- if(sp->jpegactables==NULL){return(0);}
- tiffoff = TIFFSeekFile(tif, 0, SEEK_CUR);
- bufoff=0;
- code_count=0;
- for(i2=0;i2<sp->jpegactables_length;i2++){
- TIFFSeekFile(tif, v[i2], SEEK_SET);
- TIFFReadFile(tif, &(((unsigned char*)(sp->jpegactables))[bufoff]), 16);
- code_count=0;
- for(k2=0;k2<16;k2++){
- code_count+=((unsigned char*)(sp->jpegactables))[k2+bufoff];
- }
- TIFFReadFile(tif, &(((unsigned char*)(sp->jpegactables))[bufoff+16]), code_count);
- bufoff+=16;
- bufoff+=code_count;
- }
- sp->jpegactables_length=bufoff;
- TIFFSeekFile(tif, tiffoff, SEEK_SET);
- }
- i = 0;
- do /* copy each Huffman table */
- { int size = 0;
- register UINT8 *from = tif->tif_base + *v++, *to;
- register int j = sizeof (*h)->bits;
-
- /* WARNING: This code relies on the fact that an image file not
- "memory mapped" was read entirely into a single
- buffer by "TIFFInitOJPEG()", so we can do a fast memory-to-
- memory copy here. Each table consists of 16 Bytes, which are
- suffixed to a 0 Byte when copied, followed by a variable
- number of Bytes whose length is the sum of the first 16.
- */
- if (!( *h
- = CALLJPEG(sp,0,jpeg_alloc_huff_table(&sp->cinfo.comm))
- )
- )
- {
- TIFFError(JPEGLib_name,"No space for Huffman table");
- return 0;
- };
- to = (*h++)->bits;
- *to++ = 0;
- while (--j > 0) size += *to++ = *from++; /* Copy 16 Bytes */
- if (size > sizeof (*h)->huffval/sizeof *(*h)->huffval)
- {
- TIFFError(tif->tif_name,"Huffman table too big");
- return 0;
- };
- if ((j = size) > 0) do *to++ = *from++; while (--j > 0);
- while (++size <= sizeof (*h)->huffval/sizeof *(*h)->huffval)
- *to++ = 0; /* Zero the rest of the table for cleanliness */
- }
- while (++i < v32);
- sp->jpegtablesmode |= JPEGTABLESMODE_HUFF;
- };
- break;
-
- /* The following vendor-specific TIFF tag occurs in (highly illegal) files
- produced by the Wang Imaging application for Microsoft Windows. These
- can apparently have several "pages", in which case this tag specifies
- the offset of a "page control" structure, which we don't currently know
- how to handle. 0 indicates a 1-page image with no "page control", which
- we make a feeble effort to handle.
- */
- case TIFFTAG_WANG_PAGECONTROL :
- if (v32 == 0) v32 = -1;
- sp->is_WANG = v32;
- tag = TIFFTAG_JPEGPROC+FIELD_WANG_PAGECONTROL-FIELD_JPEGPROC;
- break;
-
- /* This pseudo tag indicates whether our caller is expected to do YCbCr <->
- RGB color-space conversion (JPEGCOLORMODE_RAW <=> 0) or whether we must
- ask the JPEG Library to do it (JPEGCOLORMODE_RGB <=> 1).
- */
- case TIFFTAG_JPEGCOLORMODE :
- sp->jpegcolormode = v32;
-
- /* Mark the image to indicate whether returned data is up-sampled, so
- that "TIFF{Strip,Tile}Size()" reflect the true amount of data present.
- */
- v32 = tif->tif_flags; /* Save flags temporarily */
- tif->tif_flags &= ~TIFF_UPSAMPLED;
- if ( td->td_photometric == PHOTOMETRIC_YCBCR
- && (td->td_ycbcrsubsampling[0]<<3 | td->td_ycbcrsubsampling[1])
- != 011
- && sp->jpegcolormode == JPEGCOLORMODE_RGB
- ) tif->tif_flags |= TIFF_UPSAMPLED;
-
- /* If the up-sampling state changed, re-calculate tile size. */
-
- if ((tif->tif_flags ^ v32) & TIFF_UPSAMPLED)
- {
- tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
- tif->tif_flags |= TIFF_DIRTYDIRECT;
- };
- return 1;
- };
- TIFFSetFieldBit(tif,tag-TIFFTAG_JPEGPROC+FIELD_JPEGPROC);
- return 1;
-# undef td
- }
-
-static int
-OJPEGVGetField(register TIFF *tif,ttag_t tag,va_list ap)
- { register OJPEGState *sp = OJState(tif);
-
- switch (tag)
- {
-
- /* If this file has managed to synthesize a set of consolidated "metadata"
- tables for the current (post-TIFF Version 6.0 specification) JPEG-in-
- TIFF encapsulation strategy, then tell our caller about them; otherwise,
- keep mum.
- */
- case TIFFTAG_JPEGTABLES :
- if (sp->jpegtables_length) /* we have "new"-style JPEG tables */
- {
- *va_arg(ap,uint32 *) = sp->jpegtables_length;
- *va_arg(ap,char **) = sp->jpegtables;
- return 1;
- };
-
- /* This pseudo tag indicates whether our caller is expected to do YCbCr <->
- RGB color-space conversion (JPEGCOLORMODE_RAW <=> 0) or whether we must
- ask the JPEG Library to do it (JPEGCOLORMODE_RGB <=> 1).
- */
- case TIFFTAG_JPEGCOLORMODE :
- *va_arg(ap,uint32 *) = sp->jpegcolormode;
- return 1;
-
- /* The following tags are defined by the TIFF Version 6.0 specification
- and are obsolete. If our caller asks for information about them, do not
- return anything, even if we parsed them in an old-format "source" image.
- */
- case TIFFTAG_JPEGPROC :
- *va_arg(ap, uint16*)=sp->jpegproc;
- return(1);
- break;
- case TIFFTAG_JPEGIFOFFSET :
- *va_arg(ap, uint32*)=sp->jpegifoffset;
- return(1);
- break;
- case TIFFTAG_JPEGIFBYTECOUNT :
- *va_arg(ap, uint32*)=sp->jpegifbytecount;
- return(1);
- break;
- case TIFFTAG_JPEGRESTARTINTERVAL :
- *va_arg(ap, uint32*)=sp->jpegrestartinterval;
- return(1);
- break;
- case TIFFTAG_JPEGLOSSLESSPREDICTORS:
- *va_arg(ap, uint32*)=sp->jpeglosslesspredictors_length;
- *va_arg(ap, void**)=sp->jpeglosslesspredictors;
- return(1);
- break;
- case TIFFTAG_JPEGPOINTTRANSFORM :
- *va_arg(ap, uint32*)=sp->jpegpointtransform_length;
- *va_arg(ap, void**)=sp->jpegpointtransform;
- return(1);
- break;
- case TIFFTAG_JPEGQTABLES :
- *va_arg(ap, uint32*)=sp->jpegqtables_length;
- *va_arg(ap, void**)=sp->jpegqtables;
- return(1);
- break;
- case TIFFTAG_JPEGDCTABLES :
- *va_arg(ap, uint32*)=sp->jpegdctables_length;
- *va_arg(ap, void**)=sp->jpegdctables;
- return(1);
- break;
- case TIFFTAG_JPEGACTABLES :
- *va_arg(ap, uint32*)=sp->jpegactables_length;
- *va_arg(ap, void**)=sp->jpegactables;
- return(1);
- break;
- };
- return (*sp->vgetparent)(tif,tag,ap);
- }
-
-static void
-OJPEGPrintDir(register TIFF *tif,FILE *fd,long flags)
- { register OJPEGState *sp = OJState(tif);
-
- if ( ( flags
- & (TIFFPRINT_JPEGQTABLES|TIFFPRINT_JPEGDCTABLES|TIFFPRINT_JPEGACTABLES)
- )
- && sp->jpegtables_length
- )
- fprintf(fd," JPEG Table Data: <present>, %lu bytes\n",
- sp->jpegtables_length);
- }
-
-static uint32
-OJPEGDefaultStripSize(register TIFF *tif,register uint32 s)
- { register OJPEGState *sp = OJState(tif);
-# define td (&tif->tif_dir)
-
- if ((s = (*sp->defsparent)(tif,s)) < td->td_imagelength)
- { register tsize_t size = sp->cinfo.comm.is_decompressor
-# ifdef D_LOSSLESS_SUPPORTED
- ? sp->cinfo.d.min_codec_data_unit
-# else
- ? DCTSIZE
-# endif
-# ifdef C_LOSSLESS_SUPPORTED
- : sp->cinfo.c.data_unit;
-# else
- : DCTSIZE;
-# endif
-
- size = TIFFroundup(size,16);
- s = TIFFroundup(s,td->td_ycbcrsubsampling[1]*size);
- };
- return s;
-# undef td
- }
-
-static void
-OJPEGDefaultTileSize(register TIFF *tif,register uint32 *tw,register uint32 *th)
- { register OJPEGState *sp = OJState(tif);
- register tsize_t size;
-# define td (&tif->tif_dir)
-
- size = sp->cinfo.comm.is_decompressor
-# ifdef D_LOSSLESS_SUPPORTED
- ? sp->cinfo.d.min_codec_data_unit
-# else
- ? DCTSIZE
-# endif
-# ifdef C_LOSSLESS_SUPPORTED
- : sp->cinfo.c.data_unit;
-# else
- : DCTSIZE;
-# endif
- size = TIFFroundup(size,16);
- (*sp->deftparent)(tif,tw,th);
- *tw = TIFFroundup(*tw,td->td_ycbcrsubsampling[0]*size);
- *th = TIFFroundup(*th,td->td_ycbcrsubsampling[1]*size);
-# undef td
- }
-
-static void
-OJPEGCleanUp(register TIFF *tif)
- { register OJPEGState *sp;
-
- if ( (sp = OJState(tif)) )
- {
- CALLVJPEG(sp,jpeg_destroy(&sp->cinfo.comm)); /* Free JPEG Lib. vars. */
- if (sp->jpegtables) {_TIFFfree(sp->jpegtables);sp->jpegtables=0;}
- if (sp->jpeglosslesspredictors) {
- _TIFFfree(sp->jpeglosslesspredictors);
- sp->jpeglosslesspredictors = 0;
- }
- if (sp->jpegpointtransform) {
- _TIFFfree(sp->jpegpointtransform);
- sp->jpegpointtransform=0;
- }
- if (sp->jpegqtables) {_TIFFfree(sp->jpegqtables);sp->jpegqtables=0;}
- if (sp->jpegactables) {_TIFFfree(sp->jpegactables);sp->jpegactables=0;}
- if (sp->jpegdctables) {_TIFFfree(sp->jpegdctables);sp->jpegdctables=0;}
- /* If the image file isn't "memory mapped" and we read it all into a
- single, large memory buffer, free the buffer now.
- */
- if (!isMapped(tif) && tif->tif_base) /* free whole-file buffer */
- {
- _TIFFfree(tif->tif_base);
- tif->tif_base = 0;
- tif->tif_size = 0;
- };
- _TIFFfree(sp); /* Release local variables */
- tif->tif_data = 0;
- }
- }
-
-int
-TIFFInitOJPEG(register TIFF *tif,int scheme)
- { register OJPEGState *sp;
-# define td (&tif->tif_dir)
-# ifndef never
-
- /* This module supports a decompression-only CODEC, which is intended strictly
- for viewing old image files using the obsolete JPEG-in-TIFF encapsulation
- specified by the TIFF Version 6.0 specification. It does not, and never
- should, support compression for new images. If a client application asks us
- to, refuse and complain loudly!
- */
- if (tif->tif_mode != O_RDONLY) return _notSupported(tif);
-# endif /* never */
- if (!isMapped(tif))
- {
-
- /* BEWARE OF KLUDGE: If our host operating-system doesn't let an image
- file be "memory mapped", then we want to read the
- entire file into a single (possibly large) memory buffer as if it had
- been "memory mapped". Although this is likely to waste space, because
- analysis of the file's content might cause parts of it to be read into
- smaller buffers duplicatively, it appears to be the lesser of several
- evils. Very old JPEG-in-TIFF encapsulations aren't guaranteed to be
- JFIF bit streams, or to have a TIFF "JPEGTables" record or much other
- "metadata" to help us locate the decoding tables and entropy-coded data,
- so we're likely do a lot of random-access grokking around, and we must
- ultimately tell the JPEG Library to sequentially scan much of the file
- anyway. This is all likely to be easier if we use "brute force" to
- read the entire file, once, and don't use incremental disc I/O. If our
- client application tries to process a file so big that we can't buffer
- it entirely, then tough shit: we'll give up and exit!
- */
- if (!(tif->tif_base = _TIFFmalloc(tif->tif_size=TIFFGetFileSize(tif))))
- {
- TIFFError(tif->tif_name,"Cannot allocate file buffer");
- return 0;
- };
- if (!SeekOK(tif,0) || !ReadOK(tif,tif->tif_base,tif->tif_size))
- {
- TIFFError(tif->tif_name,"Cannot read file");
- return 0;
- }
- };
-
- /* Allocate storage for this module's per-file variables. */
-
- if (!(tif->tif_data = (tidata_t)_TIFFmalloc(sizeof *sp)))
- {
- TIFFError("TIFFInitOJPEG","No space for JPEG state block");
- return 0;
- };
- (sp = OJState(tif))->tif = tif; /* Initialize reverse pointer */
- sp->cinfo.d.err = jpeg_std_error(&sp->err); /* Initialize error handling */
- sp->err.error_exit = TIFFojpeg_error_exit;
- sp->err.output_message = TIFFojpeg_output_message;
- if (!CALLVJPEG(sp,jpeg_create_decompress(&sp->cinfo.d))) return 0;
-
- /* Install CODEC-specific tag information and override default TIFF Library
- "method" subroutines with our own, CODEC-specific methods. Like all good
- members of an object-class, we save some of these subroutine pointers for
- "fall back" in case our own methods fail.
- */
- _TIFFMergeFieldInfo(tif,ojpegFieldInfo,
- sizeof ojpegFieldInfo/sizeof *ojpegFieldInfo);
- sp->defsparent = tif->tif_defstripsize;
- sp->deftparent = tif->tif_deftilesize;
- sp->vgetparent = tif->tif_tagmethods.vgetfield;
- sp->vsetparent = tif->tif_tagmethods.vsetfield;
- tif->tif_defstripsize = OJPEGDefaultStripSize;
- tif->tif_deftilesize = OJPEGDefaultTileSize;
- tif->tif_tagmethods.vgetfield = OJPEGVGetField;
- tif->tif_tagmethods.vsetfield = OJPEGVSetField;
- tif->tif_tagmethods.printdir = OJPEGPrintDir;
-# ifdef never
- tif->tif_setupencode = OJPEGSetupEncode;
- tif->tif_preencode = OJPEGPreEncode;
- tif->tif_postencode = OJPEGPostEncode;
-# else /* well, hardly ever */
- tif->tif_setupencode = tif->tif_postencode = _notSupported;
- tif->tif_preencode = (TIFFPreMethod)_notSupported;
-# endif /* never */
- tif->tif_setupdecode = OJPEGSetupDecode;
- tif->tif_predecode = OJPEGPreDecode;
- tif->tif_postdecode = OJPEGPostDecode;
- tif->tif_cleanup = OJPEGCleanUp;
-
- /* If the image file doesn't have "JPEGInterchangeFormat[Length]" TIFF records
- to guide us, we have few clues about where its encapsulated JPEG bit stream
- is located, so establish intelligent defaults: If the Image File Directory
- doesn't immediately follow the TIFF header, assume that the JPEG data lies
- in between; otherwise, assume that it follows the Image File Directory.
- */
- if (tif->tif_header.tiff_diroff > sizeof tif->tif_header)
- {
- sp->src.next_input_byte = tif->tif_base + sizeof tif->tif_header;
- sp->src.bytes_in_buffer = tif->tif_header.tiff_diroff
- - sizeof tif->tif_header;
- }
- else /* this case is ugly! */
- { uint32 maxoffset = tif->tif_size;
- uint16 dircount;
-
- /* Calculate the offset to the next Image File Directory, if there is one,
- or to the end of the file, if not. Then arrange to read the file from
- the end of the Image File Directory to that offset.
- */
- if (tif->tif_nextdiroff) maxoffset = tif->tif_nextdiroff; /* Not EOF */
- _TIFFmemcpy(&dircount,(const tdata_t)
- (sp->src.next_input_byte = tif->tif_base+tif->tif_header.tiff_diroff),
- sizeof dircount);
- if (tif->tif_flags & TIFF_SWAB) TIFFSwabShort(&dircount);
- sp->src.next_input_byte += dircount*sizeof(TIFFDirEntry)
- + sizeof maxoffset + sizeof dircount;
- sp->src.bytes_in_buffer = tif->tif_base - sp->src.next_input_byte
- + maxoffset;
- };
-
- /* IJG JPEG Library Version 6B can be configured for either 8- or 12-bit sample
- precision, but we assume that "old JPEG" TIFF clients only need 8 bits.
- */
- sp->cinfo.d.data_precision = 8;
-# ifdef C_LOSSLESS_SUPPORTED
-
- /* If the "JPEGProc" TIFF tag is missing from the Image File Dictionary, the
- JPEG Library will use its (lossy) baseline sequential process by default.
- */
- sp->cinfo.d.data_unit = DCTSIZE;
-# endif /* C_LOSSLESS_SUPPORTED */
-
- /* Initialize other CODEC-specific variables requiring default values. */
-
- tif->tif_flags |= TIFF_NOBITREV; /* No bit-reversal within data bytes */
- sp->h_sampling = sp->v_sampling = 1; /* No subsampling by default */
- sp->is_WANG = 0; /* Assume not a MS Windows Wang Imaging file by default */
- sp->jpegtables = 0; /* No "new"-style JPEG tables synthesized yet */
- sp->jpegtables_length = 0;
- sp->jpegquality = 75; /* Default IJG quality */
- sp->jpegcolormode = JPEGCOLORMODE_RAW;
- sp->jpegtablesmode = 0; /* No tables found yet */
- sp->jpeglosslesspredictors=0;
- sp->jpeglosslesspredictors_length=0;
- sp->jpegpointtransform=0;
- sp->jpegpointtransform_length=0;
- sp->jpegqtables=0;
- sp->jpegqtables_length=0;
- sp->jpegdctables=0;
- sp->jpegdctables_length=0;
- sp->jpegactables=0;
- sp->jpegactables_length=0;
- return 1;
-# undef td
- }
-#endif /* OJPEG_SUPPORT */
-
-/* vim: set ts=8 sts=8 sw=8 noet: */
projects / opencv / blobdiff