diff options
Diffstat (limited to 'src/3rdparty/libtiff/libtiff/tif_ojpeg.c')
| -rw-r--r-- | src/3rdparty/libtiff/libtiff/tif_ojpeg.c | 2629 |
1 files changed, 0 insertions, 2629 deletions
diff --git a/src/3rdparty/libtiff/libtiff/tif_ojpeg.c b/src/3rdparty/libtiff/libtiff/tif_ojpeg.c deleted file mode 100644 index 40bc573..0000000 --- a/src/3rdparty/libtiff/libtiff/tif_ojpeg.c +++ /dev/null @@ -1,2629 +0,0 @@ -/* $Id: tif_ojpeg.c,v 1.16 2006/03/01 11:09:13 dron 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) - { - 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 - ) - { - float *ref; - if (!TIFFGetField(tif, TIFFTAG_REFERENCEBLACKWHITE, &ref)) { - 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); - } - } - 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: */ |