diff options
Diffstat (limited to 'plugins/FreeImage/src/LibTIFF/tif_jpeg.c')
| -rw-r--r-- | plugins/FreeImage/src/LibTIFF/tif_jpeg.c | 2078 |
1 files changed, 0 insertions, 2078 deletions
diff --git a/plugins/FreeImage/src/LibTIFF/tif_jpeg.c b/plugins/FreeImage/src/LibTIFF/tif_jpeg.c deleted file mode 100644 index ee7d886fa8..0000000000 --- a/plugins/FreeImage/src/LibTIFF/tif_jpeg.c +++ /dev/null @@ -1,2078 +0,0 @@ -/* $Id: tif_jpeg.c,v 1.37 2011/04/10 17:14:09 drolon Exp $ */
-
-/*
- * Copyright (c) 1994-1997 Sam Leffler
- * Copyright (c) 1994-1997 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
-#define WIN32_LEAN_AND_MEAN
-#define VC_EXTRALEAN
-
-#include "tiffiop.h"
-#ifdef JPEG_SUPPORT
-
-/*
- * TIFF Library
- *
- * JPEG Compression support per TIFF Technical Note #2
- * (*not* per the original TIFF 6.0 spec).
- *
- * This file is simply an interface to the libjpeg library written by
- * the Independent JPEG Group. You need release 5 or later of the IJG
- * code, which you can find on the Internet at ftp.uu.net:/graphics/jpeg/.
- *
- * Contributed by Tom Lane <tgl@sss.pgh.pa.us>.
- */
-#include <setjmp.h>
-
-int TIFFFillStrip(TIFF*, tstrip_t);
-int TIFFFillTile(TIFF*, ttile_t);
-
-/* We undefine FAR to avoid conflict with JPEG definition */
-
-#ifdef FAR
-#undef FAR
-#endif
-
-/*
- Libjpeg's jmorecfg.h defines INT16 and INT32, but only if XMD_H is
- not defined. Unfortunately, the MinGW and Borland compilers include
- a typedef for INT32, which causes a conflict. MSVC does not include
- a conficting typedef given the headers which are included.
-*/
-#if defined(__BORLANDC__) || defined(__MINGW32__)
-# define XMD_H 1
-#endif
-
-/*
- The windows RPCNDR.H file defines boolean, but defines it with the
- unsigned char size. You should compile JPEG library using appropriate
- definitions in jconfig.h header, but many users compile library in wrong
- way. That causes errors of the following type:
-
- "JPEGLib: JPEG parameter struct mismatch: library thinks size is 432,
- caller expects 464"
-
- For such users we wil fix the problem here. See install.doc file from
- the JPEG library distribution for details.
-*/
-
-/* Define "boolean" as unsigned char, not int, per Windows custom. */
-#if defined(WIN32) && !defined(__MINGW32__)
-# ifndef __RPCNDR_H__ /* don't conflict if rpcndr.h already read */
- typedef unsigned char boolean;
-# endif
-# define HAVE_BOOLEAN /* prevent jmorecfg.h from redefining it */
-#endif
-
-#include "../LibJPEG/jpeglib.h"
-#include "../LibJPEG/jerror.h"
-
-/*
- * We are using width_in_blocks which is supposed to be private to
- * libjpeg. Unfortunately, the libjpeg delivered with Cygwin has
- * renamed this member to width_in_data_units. Since the header has
- * also renamed a define, use that unique define name in order to
- * detect the problem header and adjust to suit.
- */
-#if defined(D_MAX_DATA_UNITS_IN_MCU)
-#define width_in_blocks width_in_data_units
-#endif
-
-/*
- * On some machines it may be worthwhile to use _setjmp or sigsetjmp
- * in place of plain setjmp. These macros will make it easier.
- */
-#define SETJMP(jbuf) setjmp(jbuf)
-#define LONGJMP(jbuf,code) longjmp(jbuf,code)
-#define JMP_BUF jmp_buf
-
-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 block for each open TIFF file using
- * libjpeg to do JPEG compression/decompression.
- *
- * libjpeg's visible state is either a jpeg_compress_struct
- * or jpeg_decompress_struct depending on which way we
- * are going. comm can be used to refer to the fields
- * which are common to both.
- *
- * NB: cinfo is required to be the first member of JPEGState,
- * so we can safely cast JPEGState* -> jpeg_xxx_struct*
- * and vice versa!
- */
-typedef struct {
- union {
- struct jpeg_compress_struct c;
- struct jpeg_decompress_struct d;
- struct jpeg_common_struct comm;
- } cinfo; /* NB: must be first */
- int cinfo_initialized;
-
- jpeg_error_mgr err; /* libjpeg error manager */
- JMP_BUF exit_jmpbuf; /* for catching libjpeg failures */
- /*
- * The following two members could be a union, but
- * they're small enough that it's not worth the effort.
- */
- jpeg_destination_mgr dest; /* data dest for compression */
- jpeg_source_mgr src; /* data source for decompression */
- /* private state */
- TIFF* tif; /* back link needed by some code */
- uint16 photometric; /* copy of PhotometricInterpretation */
- uint16 h_sampling; /* luminance sampling factors */
- uint16 v_sampling;
- tsize_t bytesperline; /* decompressed bytes per scanline */
- /* pointers to intermediate buffers when processing downsampled data */
- JSAMPARRAY ds_buffer[MAX_COMPONENTS];
- int scancount; /* number of "scanlines" accumulated */
- int samplesperclump;
-
- TIFFVGetMethod vgetparent; /* super-class method */
- TIFFVSetMethod vsetparent; /* super-class method */
- TIFFPrintMethod printdir; /* super-class method */
- TIFFStripMethod defsparent; /* super-class method */
- TIFFTileMethod deftparent; /* super-class method */
- /* pseudo-tag fields */
- void* jpegtables; /* JPEGTables tag value, or NULL */
- uint32 jpegtables_length; /* number of bytes in same */
- int jpegquality; /* Compression quality level */
- int jpegcolormode; /* Auto RGB<=>YCbCr convert? */
- int jpegtablesmode; /* What to put in JPEGTables */
-
- int ycbcrsampling_fetched;
- uint32 recvparams; /* encoded Class 2 session params */
- char* subaddress; /* subaddress string */
- uint32 recvtime; /* time spent receiving (secs) */
- char* faxdcs; /* encoded fax parameters (DCS, Table 2/T.30) */
-} JPEGState;
-
-#define JState(tif) ((JPEGState*)(tif)->tif_data)
-
-static int JPEGDecode(TIFF*, tidata_t, tsize_t, tsample_t);
-static int JPEGDecodeRaw(TIFF*, tidata_t, tsize_t, tsample_t);
-static int JPEGEncode(TIFF*, tidata_t, tsize_t, tsample_t);
-static int JPEGEncodeRaw(TIFF*, tidata_t, tsize_t, tsample_t);
-static int JPEGInitializeLibJPEG( TIFF * tif,
- int force_encode, int force_decode );
-
-#define FIELD_JPEGTABLES (FIELD_CODEC+0)
-#define FIELD_RECVPARAMS (FIELD_CODEC+1)
-#define FIELD_SUBADDRESS (FIELD_CODEC+2)
-#define FIELD_RECVTIME (FIELD_CODEC+3)
-#define FIELD_FAXDCS (FIELD_CODEC+4)
-
-static const TIFFFieldInfo jpegFieldInfo[] = {
- { TIFFTAG_JPEGTABLES, -3,-3, TIFF_UNDEFINED, FIELD_JPEGTABLES,
- FALSE, TRUE, "JPEGTables" },
- { TIFFTAG_JPEGQUALITY, 0, 0, TIFF_ANY, FIELD_PSEUDO,
- TRUE, FALSE, "" },
- { TIFFTAG_JPEGCOLORMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
- FALSE, FALSE, "" },
- { TIFFTAG_JPEGTABLESMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
- FALSE, FALSE, "" },
- /* Specific for JPEG in faxes */
- { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS,
- TRUE, FALSE, "FaxRecvParams" },
- { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS,
- TRUE, FALSE, "FaxSubAddress" },
- { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME,
- TRUE, FALSE, "FaxRecvTime" },
- { TIFFTAG_FAXDCS, -1, -1, TIFF_ASCII, FIELD_FAXDCS,
- TRUE, FALSE, "FaxDcs" },
-};
-#define N(a) (sizeof (a) / sizeof (a[0]))
-
-/*
- * libjpeg interface layer.
- *
- * We use setjmp/longjmp to return control to libtiff
- * when a fatal error is encountered within the JPEG
- * library. We also direct libjpeg error and warning
- * messages through the appropriate libtiff handlers.
- */
-
-/*
- * Error handling routines (these replace corresponding
- * IJG routines from jerror.c). These are used for both
- * compression and decompression.
- */
-static void
-TIFFjpeg_error_exit(j_common_ptr cinfo)
-{
- JPEGState *sp = (JPEGState *) cinfo; /* NB: cinfo assumed first */
- char buffer[JMSG_LENGTH_MAX];
-
- (*cinfo->err->format_message) (cinfo, buffer);
- TIFFErrorExt(sp->tif->tif_clientdata, "JPEGLib", "%s", buffer); /* display the error message */
- jpeg_abort(cinfo); /* clean up libjpeg state */
- LONGJMP(sp->exit_jmpbuf, 1); /* return to libtiff caller */
-}
-
-/*
- * This routine is invoked only for warning messages,
- * since error_exit does its own thing and trace_level
- * is never set > 0.
- */
-static void
-TIFFjpeg_output_message(j_common_ptr cinfo)
-{
- char buffer[JMSG_LENGTH_MAX];
-
- (*cinfo->err->format_message) (cinfo, buffer);
- TIFFWarningExt(((JPEGState *) cinfo)->tif->tif_clientdata, "JPEGLib", "%s", buffer);
-}
-
-/*
- * Interface routines. This layer of routines exists
- * primarily to limit side-effects from using setjmp.
- * Also, normal/error returns are converted into return
- * values per libtiff practice.
- */
-#define CALLJPEG(sp, fail, op) (SETJMP((sp)->exit_jmpbuf) ? (fail) : (op))
-#define CALLVJPEG(sp, op) CALLJPEG(sp, 0, ((op),1))
-
-static int
-TIFFjpeg_create_compress(JPEGState* sp)
-{
- /* initialize JPEG error handling */
- sp->cinfo.c.err = jpeg_std_error(&sp->err);
- sp->err.error_exit = TIFFjpeg_error_exit;
- sp->err.output_message = TIFFjpeg_output_message;
-
- return CALLVJPEG(sp, jpeg_create_compress(&sp->cinfo.c));
-}
-
-static int
-TIFFjpeg_create_decompress(JPEGState* sp)
-{
- /* initialize JPEG error handling */
- sp->cinfo.d.err = jpeg_std_error(&sp->err);
- sp->err.error_exit = TIFFjpeg_error_exit;
- sp->err.output_message = TIFFjpeg_output_message;
-
- return CALLVJPEG(sp, jpeg_create_decompress(&sp->cinfo.d));
-}
-
-static int
-TIFFjpeg_set_defaults(JPEGState* sp)
-{
- return CALLVJPEG(sp, jpeg_set_defaults(&sp->cinfo.c));
-}
-
-static int
-TIFFjpeg_set_colorspace(JPEGState* sp, J_COLOR_SPACE colorspace)
-{
- return CALLVJPEG(sp, jpeg_set_colorspace(&sp->cinfo.c, colorspace));
-}
-
-static int
-TIFFjpeg_set_quality(JPEGState* sp, int quality, boolean force_baseline)
-{
- return CALLVJPEG(sp,
- jpeg_set_quality(&sp->cinfo.c, quality, force_baseline));
-}
-
-static int
-TIFFjpeg_suppress_tables(JPEGState* sp, boolean suppress)
-{
- return CALLVJPEG(sp, jpeg_suppress_tables(&sp->cinfo.c, suppress));
-}
-
-static int
-TIFFjpeg_start_compress(JPEGState* sp, boolean write_all_tables)
-{
- return CALLVJPEG(sp,
- jpeg_start_compress(&sp->cinfo.c, write_all_tables));
-}
-
-static int
-TIFFjpeg_write_scanlines(JPEGState* sp, JSAMPARRAY scanlines, int num_lines)
-{
- return CALLJPEG(sp, -1, (int) jpeg_write_scanlines(&sp->cinfo.c,
- scanlines, (JDIMENSION) num_lines));
-}
-
-static int
-TIFFjpeg_write_raw_data(JPEGState* sp, JSAMPIMAGE data, int num_lines)
-{
- return CALLJPEG(sp, -1, (int) jpeg_write_raw_data(&sp->cinfo.c,
- data, (JDIMENSION) num_lines));
-}
-
-static int
-TIFFjpeg_finish_compress(JPEGState* sp)
-{
- return CALLVJPEG(sp, jpeg_finish_compress(&sp->cinfo.c));
-}
-
-static int
-TIFFjpeg_write_tables(JPEGState* sp)
-{
- return CALLVJPEG(sp, jpeg_write_tables(&sp->cinfo.c));
-}
-
-static int
-TIFFjpeg_read_header(JPEGState* sp, boolean require_image)
-{
- return CALLJPEG(sp, -1, jpeg_read_header(&sp->cinfo.d, require_image));
-}
-
-static int
-TIFFjpeg_start_decompress(JPEGState* sp)
-{
- return CALLVJPEG(sp, jpeg_start_decompress(&sp->cinfo.d));
-}
-
-static int
-TIFFjpeg_read_scanlines(JPEGState* sp, JSAMPARRAY scanlines, int max_lines)
-{
- return CALLJPEG(sp, -1, (int) jpeg_read_scanlines(&sp->cinfo.d,
- scanlines, (JDIMENSION) max_lines));
-}
-
-static int
-TIFFjpeg_read_raw_data(JPEGState* sp, JSAMPIMAGE data, int max_lines)
-{
- return CALLJPEG(sp, -1, (int) jpeg_read_raw_data(&sp->cinfo.d,
- data, (JDIMENSION) max_lines));
-}
-
-static int
-TIFFjpeg_finish_decompress(JPEGState* sp)
-{
- return CALLJPEG(sp, -1, (int) jpeg_finish_decompress(&sp->cinfo.d));
-}
-
-static int
-TIFFjpeg_abort(JPEGState* sp)
-{
- return CALLVJPEG(sp, jpeg_abort(&sp->cinfo.comm));
-}
-
-static int
-TIFFjpeg_destroy(JPEGState* sp)
-{
- return CALLVJPEG(sp, jpeg_destroy(&sp->cinfo.comm));
-}
-
-static JSAMPARRAY
-TIFFjpeg_alloc_sarray(JPEGState* sp, int pool_id,
- JDIMENSION samplesperrow, JDIMENSION numrows)
-{
- return CALLJPEG(sp, (JSAMPARRAY) NULL,
- (*sp->cinfo.comm.mem->alloc_sarray)
- (&sp->cinfo.comm, pool_id, samplesperrow, numrows));
-}
-
-/*
- * JPEG library destination data manager.
- * These routines direct compressed data from libjpeg into the
- * libtiff output buffer.
- */
-
-static void
-std_init_destination(j_compress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
- TIFF* tif = sp->tif;
-
- sp->dest.next_output_byte = (JOCTET*) tif->tif_rawdata;
- sp->dest.free_in_buffer = (size_t) tif->tif_rawdatasize;
-}
-
-static boolean
-std_empty_output_buffer(j_compress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
- TIFF* tif = sp->tif;
-
- /* the entire buffer has been filled */
- tif->tif_rawcc = tif->tif_rawdatasize;
- TIFFFlushData1(tif);
- sp->dest.next_output_byte = (JOCTET*) tif->tif_rawdata;
- sp->dest.free_in_buffer = (size_t) tif->tif_rawdatasize;
-
- return (TRUE);
-}
-
-static void
-std_term_destination(j_compress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
- TIFF* tif = sp->tif;
-
- tif->tif_rawcp = (tidata_t) sp->dest.next_output_byte;
- tif->tif_rawcc =
- tif->tif_rawdatasize - (tsize_t) sp->dest.free_in_buffer;
- /* NB: libtiff does the final buffer flush */
-}
-
-static void
-TIFFjpeg_data_dest(JPEGState* sp, TIFF* tif)
-{
- (void) tif;
- sp->cinfo.c.dest = &sp->dest;
- sp->dest.init_destination = std_init_destination;
- sp->dest.empty_output_buffer = std_empty_output_buffer;
- sp->dest.term_destination = std_term_destination;
-}
-
-/*
- * Alternate destination manager for outputting to JPEGTables field.
- */
-
-static void
-tables_init_destination(j_compress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
-
- /* while building, jpegtables_length is allocated buffer size */
- sp->dest.next_output_byte = (JOCTET*) sp->jpegtables;
- sp->dest.free_in_buffer = (size_t) sp->jpegtables_length;
-}
-
-static boolean
-tables_empty_output_buffer(j_compress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
- void* newbuf;
-
- /* the entire buffer has been filled; enlarge it by 1000 bytes */
- newbuf = _TIFFrealloc((tdata_t) sp->jpegtables,
- (tsize_t) (sp->jpegtables_length + 1000));
- if (newbuf == NULL)
- 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);
-}
-
-static void
-tables_term_destination(j_compress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
-
- /* set tables length to number of bytes actually emitted */
- sp->jpegtables_length -= sp->dest.free_in_buffer;
-}
-
-static int
-TIFFjpeg_tables_dest(JPEGState* sp, TIFF* tif)
-{
- (void) tif;
- /*
- * Allocate a working buffer for building tables.
- * Initial size is 1000 bytes, which is usually adequate.
- */
- if (sp->jpegtables)
- _TIFFfree(sp->jpegtables);
- sp->jpegtables_length = 1000;
- sp->jpegtables = (void*) _TIFFmalloc((tsize_t) sp->jpegtables_length);
- if (sp->jpegtables == NULL) {
- sp->jpegtables_length = 0;
- TIFFErrorExt(sp->tif->tif_clientdata, "TIFFjpeg_tables_dest", "No space for JPEGTables");
- 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);
-}
-
-/*
- * JPEG library source data manager.
- * These routines supply compressed data to libjpeg.
- */
-
-static void
-std_init_source(j_decompress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
- TIFF* tif = sp->tif;
-
- sp->src.next_input_byte = (const JOCTET*) tif->tif_rawdata;
- sp->src.bytes_in_buffer = (size_t) tif->tif_rawcc;
-}
-
-static boolean
-std_fill_input_buffer(j_decompress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState* ) cinfo;
- static const JOCTET dummy_EOI[2] = { 0xFF, JPEG_EOI };
-
- /*
- * Should never get here since entire strip/tile is
- * read into memory before the decompressor is called,
- * and thus was supplied by init_source.
- */
- WARNMS(cinfo, JWRN_JPEG_EOF);
- /* insert a fake EOI marker */
- sp->src.next_input_byte = dummy_EOI;
- sp->src.bytes_in_buffer = 2;
- return (TRUE);
-}
-
-static void
-std_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
-{
- JPEGState* sp = (JPEGState*) 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;
- }
- }
-}
-
-static void
-std_term_source(j_decompress_ptr cinfo)
-{
- /* No work necessary here */
- /* Or must we update tif->tif_rawcp, tif->tif_rawcc ??? */
- /* (if so, need empty tables_term_source!) */
- (void) cinfo;
-}
-
-static void
-TIFFjpeg_data_src(JPEGState* sp, TIFF* tif)
-{
- (void) tif;
- 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;
- sp->src.bytes_in_buffer = 0; /* for safety */
- sp->src.next_input_byte = NULL;
-}
-
-/*
- * Alternate source manager for reading from JPEGTables.
- * We can share all the code except for the init routine.
- */
-
-static void
-tables_init_source(j_decompress_ptr cinfo)
-{
- JPEGState* sp = (JPEGState*) cinfo;
-
- sp->src.next_input_byte = (const JOCTET*) sp->jpegtables;
- sp->src.bytes_in_buffer = (size_t) sp->jpegtables_length;
-}
-
-static void
-TIFFjpeg_tables_src(JPEGState* sp, TIFF* tif)
-{
- TIFFjpeg_data_src(sp, tif);
- sp->src.init_source = tables_init_source;
-}
-
-/*
- * Allocate downsampled-data buffers needed for downsampled I/O.
- * We use values computed in jpeg_start_compress or jpeg_start_decompress.
- * We use libjpeg's allocator so that buffers will be released automatically
- * when done with strip/tile.
- * This is also a handy place to compute samplesperclump, bytesperline.
- */
-static int
-alloc_downsampled_buffers(TIFF* tif, jpeg_component_info* comp_info,
- int num_components)
-{
- JPEGState* sp = JState(tif);
- int ci;
- jpeg_component_info* compptr;
- JSAMPARRAY buf;
- int samples_per_clump = 0;
-
- for (ci = 0, compptr = comp_info; ci < num_components;
- ci++, compptr++) {
- samples_per_clump += compptr->h_samp_factor *
- compptr->v_samp_factor;
- buf = TIFFjpeg_alloc_sarray(sp, JPOOL_IMAGE,
- compptr->width_in_blocks * DCTSIZE,
- (JDIMENSION) (compptr->v_samp_factor*DCTSIZE));
- if (buf == NULL)
- return (0);
- sp->ds_buffer[ci] = buf;
- }
- sp->samplesperclump = samples_per_clump;
- return (1);
-}
-
-
-/*
- * JPEG Decoding.
- */
-
-static int
-JPEGSetupDecode(TIFF* tif)
-{
- JPEGState* sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
-
- JPEGInitializeLibJPEG( tif, 0, 1 );
-
- assert(sp != NULL);
- assert(sp->cinfo.comm.is_decompressor);
-
- /* Read JPEGTables if it is present */
- if (TIFFFieldSet(tif,FIELD_JPEGTABLES)) {
- TIFFjpeg_tables_src(sp, tif);
- if(TIFFjpeg_read_header(sp,FALSE) != JPEG_HEADER_TABLES_ONLY) {
- TIFFErrorExt(tif->tif_clientdata, "JPEGSetupDecode", "Bogus JPEGTables field");
- return (0);
- }
- }
-
- /* Grab parameters that are same for all strips/tiles */
- sp->photometric = td->td_photometric;
- switch (sp->photometric) {
- case PHOTOMETRIC_YCBCR:
- sp->h_sampling = td->td_ycbcrsubsampling[0];
- sp->v_sampling = td->td_ycbcrsubsampling[1];
- break;
- default:
- /* TIFF 6.0 forbids subsampling of all other color spaces */
- sp->h_sampling = 1;
- sp->v_sampling = 1;
- break;
- }
-
- /* Set up for reading normal data */
- TIFFjpeg_data_src(sp, tif);
- tif->tif_postdecode = _TIFFNoPostDecode; /* override byte swapping */
- return (1);
-}
-
-/*
- * Set up for decoding a strip or tile.
- */
-static int
-JPEGPreDecode(TIFF* tif, tsample_t s)
-{
- JPEGState *sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
- static const char module[] = "JPEGPreDecode";
- uint32 segment_width, segment_height;
- int downsampled_output;
- int ci;
-
- assert(sp != NULL);
- assert(sp->cinfo.comm.is_decompressor);
- /*
- * Reset decoder state from any previous strip/tile,
- * in case application didn't read the whole strip.
- */
- if (!TIFFjpeg_abort(sp))
- return (0);
- /*
- * Read the header for this strip/tile.
- */
- if (TIFFjpeg_read_header(sp, TRUE) != JPEG_HEADER_OK)
- return (0);
- /*
- * Check image parameters and set decompression parameters.
- */
- segment_width = td->td_imagewidth;
- segment_height = td->td_imagelength - tif->tif_row;
- if (isTiled(tif)) {
- segment_width = td->td_tilewidth;
- segment_height = td->td_tilelength;
- sp->bytesperline = TIFFTileRowSize(tif);
- } else {
- if (segment_height > td->td_rowsperstrip)
- segment_height = td->td_rowsperstrip;
- sp->bytesperline = TIFFOldScanlineSize(tif);
- }
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE && s > 0) {
- /*
- * For PC 2, scale down the expected strip/tile size
- * to match a downsampled component
- */
- segment_width = TIFFhowmany(segment_width, sp->h_sampling);
- segment_height = TIFFhowmany(segment_height, sp->v_sampling);
- }
- if (sp->cinfo.d.image_width < segment_width ||
- sp->cinfo.d.image_height < segment_height) {
- TIFFWarningExt(tif->tif_clientdata, module,
- "Improper JPEG strip/tile size, "
- "expected %dx%d, got %dx%d",
- segment_width, segment_height,
- sp->cinfo.d.image_width,
- sp->cinfo.d.image_height);
- }
- if (sp->cinfo.d.image_width > segment_width ||
- sp->cinfo.d.image_height > segment_height) {
- /*
- * This case could be dangerous, if the strip or tile size has
- * been reported as less than the amount of data jpeg will
- * return, some potential security issues arise. Catch this
- * case and error out.
- */
- TIFFErrorExt(tif->tif_clientdata, module,
- "JPEG strip/tile size exceeds expected dimensions,"
- " expected %dx%d, got %dx%d",
- segment_width, segment_height,
- sp->cinfo.d.image_width, sp->cinfo.d.image_height);
- return (0);
- }
- if (sp->cinfo.d.num_components !=
- (td->td_planarconfig == PLANARCONFIG_CONTIG ?
- td->td_samplesperpixel : 1)) {
- TIFFErrorExt(tif->tif_clientdata, module, "Improper JPEG component count");
- return (0);
- }
-#ifdef JPEG_LIB_MK1
- if (12 != td->td_bitspersample && 8 != td->td_bitspersample) {
- TIFFErrorExt(tif->tif_clientdata, module, "Improper JPEG data precision");
- return (0);
- }
- sp->cinfo.d.data_precision = td->td_bitspersample;
- sp->cinfo.d.bits_in_jsample = td->td_bitspersample;
-#else
- if (sp->cinfo.d.data_precision != td->td_bitspersample) {
- TIFFErrorExt(tif->tif_clientdata, module, "Improper JPEG data precision");
- return (0);
- }
-#endif
- if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
- /* Component 0 should have expected sampling factors */
- if (sp->cinfo.d.comp_info[0].h_samp_factor != sp->h_sampling ||
- sp->cinfo.d.comp_info[0].v_samp_factor != sp->v_sampling) {
- TIFFWarningExt(tif->tif_clientdata, module,
- "Improper JPEG sampling factors %d,%d\n"
- "Apparently should be %d,%d.",
- sp->cinfo.d.comp_info[0].h_samp_factor,
- sp->cinfo.d.comp_info[0].v_samp_factor,
- sp->h_sampling, sp->v_sampling);
-
- /*
- * There are potential security issues here
- * for decoders that have already allocated
- * buffers based on the expected sampling
- * factors. Lets check the sampling factors
- * dont exceed what we were expecting.
- */
- if (sp->cinfo.d.comp_info[0].h_samp_factor
- > sp->h_sampling
- || sp->cinfo.d.comp_info[0].v_samp_factor
- > sp->v_sampling) {
- TIFFErrorExt(tif->tif_clientdata,
- module,
- "Cannot honour JPEG sampling factors"
- " that exceed those specified.");
- return (0);
- }
-
- /*
- * XXX: Files written by the Intergraph software
- * has different sampling factors stored in the
- * TIFF tags and in the JPEG structures. We will
- * try to deduce Intergraph files by the presense
- * of the tag 33918.
- */
- if (!_TIFFFindFieldInfo(tif, 33918, TIFF_ANY)) {
- TIFFWarningExt(tif->tif_clientdata, module,
- "Decompressor will try reading with "
- "sampling %d,%d.",
- sp->cinfo.d.comp_info[0].h_samp_factor,
- sp->cinfo.d.comp_info[0].v_samp_factor);
-
- sp->h_sampling = (uint16)
- sp->cinfo.d.comp_info[0].h_samp_factor;
- sp->v_sampling = (uint16)
- sp->cinfo.d.comp_info[0].v_samp_factor;
- }
- }
- /* Rest should have sampling factors 1,1 */
- for (ci = 1; ci < sp->cinfo.d.num_components; ci++) {
- if (sp->cinfo.d.comp_info[ci].h_samp_factor != 1 ||
- sp->cinfo.d.comp_info[ci].v_samp_factor != 1) {
- TIFFErrorExt(tif->tif_clientdata, module, "Improper JPEG sampling factors");
- return (0);
- }
- }
- } else {
- /* PC 2's single component should have sampling factors 1,1 */
- if (sp->cinfo.d.comp_info[0].h_samp_factor != 1 ||
- sp->cinfo.d.comp_info[0].v_samp_factor != 1) {
- TIFFErrorExt(tif->tif_clientdata, module, "Improper JPEG sampling factors");
- return (0);
- }
- }
- downsampled_output = FALSE;
- if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
- sp->photometric == PHOTOMETRIC_YCBCR &&
- sp->jpegcolormode == JPEGCOLORMODE_RGB) {
- /* Convert YCbCr to RGB */
- sp->cinfo.d.jpeg_color_space = JCS_YCbCr;
- sp->cinfo.d.out_color_space = JCS_RGB;
- } else {
- /* Suppress colorspace handling */
- sp->cinfo.d.jpeg_color_space = JCS_UNKNOWN;
- sp->cinfo.d.out_color_space = JCS_UNKNOWN;
- if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
- (sp->h_sampling != 1 || sp->v_sampling != 1))
- downsampled_output = TRUE;
- /* XXX what about up-sampling? */
- }
- if (downsampled_output) {
- /* Need to use raw-data interface to libjpeg */
- sp->cinfo.d.raw_data_out = TRUE;
- tif->tif_decoderow = JPEGDecodeRaw;
- tif->tif_decodestrip = JPEGDecodeRaw;
- tif->tif_decodetile = JPEGDecodeRaw;
- } else {
- /* Use normal interface to libjpeg */
- sp->cinfo.d.raw_data_out = FALSE;
- tif->tif_decoderow = JPEGDecode;
- tif->tif_decodestrip = JPEGDecode;
- tif->tif_decodetile = JPEGDecode;
- }
- /* Start JPEG decompressor */
- if (!TIFFjpeg_start_decompress(sp))
- return (0);
- /* Allocate downsampled-data buffers if needed */
- if (downsampled_output) {
- if (!alloc_downsampled_buffers(tif, sp->cinfo.d.comp_info,
- sp->cinfo.d.num_components))
- return (0);
- sp->scancount = DCTSIZE; /* mark buffer empty */
- }
- return (1);
-}
-
-/*
- * Decode a chunk of pixels.
- * "Standard" case: returned data is not downsampled.
- */
-/*ARGSUSED*/ static int
-JPEGDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
-{
- JPEGState *sp = JState(tif);
- tsize_t nrows;
- (void) s;
-
- nrows = cc / sp->bytesperline;
- if (cc % sp->bytesperline)
- TIFFWarningExt(tif->tif_clientdata, tif->tif_name, "fractional scanline not read");
-
- if ( nrows > (int) sp->cinfo.d.image_height )
- nrows = sp->cinfo.d.image_height;
-
- /* data is expected to be read in multiples of a scanline */
- if (nrows)
- {
- JSAMPROW line_work_buf = NULL;
-
- /*
- ** For 6B, only use temporary buffer for 12 bit imagery.
- ** For Mk1 always use it.
- */
-#if !defined(JPEG_LIB_MK1)
- if ( sp->cinfo.d.data_precision == 12 )
-#endif
- {
- line_work_buf = (JSAMPROW)
- _TIFFmalloc(sizeof(short) * sp->cinfo.d.output_width
- * sp->cinfo.d.num_components );
- }
-
- do {
- if ( line_work_buf != NULL )
- {
- /*
- ** In the MK1 case, we aways read into a 16bit buffer, and then
- ** pack down to 12bit or 8bit. In 6B case we only read into 16
- ** bit buffer for 12bit data, which we need to repack.
- */
- if (TIFFjpeg_read_scanlines(sp, &line_work_buf, 1) != 1)
- return (0);
-
- if ( sp->cinfo.d.data_precision == 12 )
- {
- int value_pairs = (sp->cinfo.d.output_width
- * sp->cinfo.d.num_components) / 2;
- int iPair;
-
- for ( iPair = 0; iPair < value_pairs; iPair++ )
- {
- unsigned char *out_ptr =
- ((unsigned char *) buf) + iPair * 3;
- JSAMPLE *in_ptr = line_work_buf + iPair * 2;
-
- out_ptr[0] = (in_ptr[0] & 0xff0) >> 4;
- out_ptr[1] = ((in_ptr[0] & 0xf) << 4)
- | ((in_ptr[1] & 0xf00) >> 8);
- out_ptr[2] = ((in_ptr[1] & 0xff) >> 0);
- }
- }
- else if ( sp->cinfo.d.data_precision == 8 )
- {
- int value_count = (sp->cinfo.d.output_width
- * sp->cinfo.d.num_components);
- int iValue;
-
- for ( iValue = 0; iValue < value_count; iValue++ )
- {
- ((unsigned char *) buf)[iValue] =
- line_work_buf[iValue] & 0xff;
- }
- }
- }
- else
- {
- /*
- ** In the libjpeg6b 8bit case. We read directly into the
- ** TIFF buffer.
- */
- JSAMPROW bufptr = (JSAMPROW)buf;
-
- if (TIFFjpeg_read_scanlines(sp, &bufptr, 1) != 1)
- return (0);
- }
-
- ++tif->tif_row;
- buf += sp->bytesperline;
- cc -= sp->bytesperline;
- } while (--nrows > 0);
-
- if ( line_work_buf != NULL )
- _TIFFfree( line_work_buf );
- }
-
- /* Close down the decompressor if we've finished the strip or tile. */
- return sp->cinfo.d.output_scanline < sp->cinfo.d.output_height
- || TIFFjpeg_finish_decompress(sp);
-}
-
-/*
- * Decode a chunk of pixels.
- * Returned data is downsampled per sampling factors.
- */
-/*ARGSUSED*/ static int
-JPEGDecodeRaw(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
-{
- JPEGState *sp = JState(tif);
- tsize_t nrows;
- (void) s;
-
- nrows = cc / sp->bytesperline;
- if (cc % sp->bytesperline)
- TIFFWarningExt(tif->tif_clientdata, tif->tif_name, "fractional scanline not read");
-
- if ( nrows > (int) sp->cinfo.d.image_height )
- nrows = sp->cinfo.d.image_height;
-
- /* data is expected to be read in multiples of a scanline */
- if (nrows) {
- /* Cb,Cr both have sampling factors 1, so this is correct */
- JDIMENSION clumps_per_line = sp->cinfo.d.comp_info[1].downsampled_width;
- int samples_per_clump = sp->samplesperclump;
-
-#ifdef JPEG_LIB_MK1
- unsigned short* tmpbuf = _TIFFmalloc(sizeof(unsigned short) *
- sp->cinfo.d.output_width *
- sp->cinfo.d.num_components);
-#endif
-
- do {
- jpeg_component_info *compptr;
- int ci, clumpoffset;
-
- /* Reload downsampled-data buffer if needed */
- if (sp->scancount >= DCTSIZE) {
- int n = sp->cinfo.d.max_v_samp_factor * DCTSIZE;
- if (TIFFjpeg_read_raw_data(sp, sp->ds_buffer, n) != n)
- return (0);
- sp->scancount = 0;
- }
- /*
- * Fastest way to unseparate data is to make one pass
- * over the scanline for each row of each component.
- */
- clumpoffset = 0; /* first sample in clump */
- for (ci = 0, compptr = sp->cinfo.d.comp_info;
- ci < sp->cinfo.d.num_components;
- ci++, compptr++) {
- int hsamp = compptr->h_samp_factor;
- int vsamp = compptr->v_samp_factor;
- int ypos;
-
- for (ypos = 0; ypos < vsamp; ypos++) {
- JSAMPLE *inptr = sp->ds_buffer[ci][sp->scancount*vsamp + ypos];
-#ifdef JPEG_LIB_MK1
- JSAMPLE *outptr = (JSAMPLE*)tmpbuf + clumpoffset;
-#else
- JSAMPLE *outptr = (JSAMPLE*)buf + clumpoffset;
-#endif
- JDIMENSION nclump;
-
- if (hsamp == 1) {
- /* fast path for at least Cb and Cr */
- for (nclump = clumps_per_line; nclump-- > 0; ) {
- outptr[0] = *inptr++;
- outptr += samples_per_clump;
- }
- } else {
- int xpos;
-
- /* general case */
- for (nclump = clumps_per_line; nclump-- > 0; ) {
- for (xpos = 0; xpos < hsamp; xpos++)
- outptr[xpos] = *inptr++;
- outptr += samples_per_clump;
- }
- }
- clumpoffset += hsamp;
- }
- }
-
-#ifdef JPEG_LIB_MK1
- {
- if (sp->cinfo.d.data_precision == 8)
- {
- int i=0;
- int len = sp->cinfo.d.output_width * sp->cinfo.d.num_components;
- for (i=0; i<len; i++)
- {
- ((unsigned char*)buf)[i] = tmpbuf[i] & 0xff;
- }
- }
- else
- { /* 12-bit */
- int value_pairs = (sp->cinfo.d.output_width
- * sp->cinfo.d.num_components) / 2;
- int iPair;
- for ( iPair = 0; iPair < value_pairs; iPair++ )
- {
- unsigned char *out_ptr = ((unsigned char *) buf) + iPair * 3;
- JSAMPLE *in_ptr = tmpbuf + iPair * 2;
- out_ptr[0] = (in_ptr[0] & 0xff0) >> 4;
- out_ptr[1] = ((in_ptr[0] & 0xf) << 4)
- | ((in_ptr[1] & 0xf00) >> 8);
- out_ptr[2] = ((in_ptr[1] & 0xff) >> 0);
- }
- }
- }
-#endif
-
- sp->scancount ++;
- tif->tif_row += sp->v_sampling;
- /* increment/decrement of buf and cc is still incorrect, but should not matter
- * TODO: resolve this */
- buf += sp->bytesperline;
- cc -= sp->bytesperline;
- } while (--nrows > 0);
-
-#ifdef JPEG_LIB_MK1
- _TIFFfree(tmpbuf);
-#endif
-
- }
-
- /* Close down the decompressor if done. */
- return sp->cinfo.d.output_scanline < sp->cinfo.d.output_height
- || TIFFjpeg_finish_decompress(sp);
-}
-
-
-/*
- * JPEG Encoding.
- */
-
-static void
-unsuppress_quant_table (JPEGState* sp, int tblno)
-{
- JQUANT_TBL* qtbl;
-
- if ((qtbl = sp->cinfo.c.quant_tbl_ptrs[tblno]) != NULL)
- qtbl->sent_table = FALSE;
-}
-
-static void
-unsuppress_huff_table (JPEGState* sp, int tblno)
-{
- JHUFF_TBL* htbl;
-
- if ((htbl = sp->cinfo.c.dc_huff_tbl_ptrs[tblno]) != NULL)
- htbl->sent_table = FALSE;
- if ((htbl = sp->cinfo.c.ac_huff_tbl_ptrs[tblno]) != NULL)
- htbl->sent_table = FALSE;
-}
-
-static int
-prepare_JPEGTables(TIFF* tif)
-{
- JPEGState* sp = JState(tif);
-
- JPEGInitializeLibJPEG( tif, 0, 0 );
-
- /* Initialize quant tables for current quality setting */
- if (!TIFFjpeg_set_quality(sp, sp->jpegquality, FALSE))
- return (0);
- /* Mark only the tables we want for output */
- /* NB: chrominance tables are currently used only with YCbCr */
- if (!TIFFjpeg_suppress_tables(sp, TRUE))
- return (0);
- if (sp->jpegtablesmode & JPEGTABLESMODE_QUANT) {
- unsuppress_quant_table(sp, 0);
- if (sp->photometric == PHOTOMETRIC_YCBCR)
- unsuppress_quant_table(sp, 1);
- }
- if (sp->jpegtablesmode & JPEGTABLESMODE_HUFF) {
- unsuppress_huff_table(sp, 0);
- if (sp->photometric == PHOTOMETRIC_YCBCR)
- unsuppress_huff_table(sp, 1);
- }
- /* Direct libjpeg output into jpegtables */
- if (!TIFFjpeg_tables_dest(sp, tif))
- return (0);
- /* Emit tables-only datastream */
- if (!TIFFjpeg_write_tables(sp))
- return (0);
-
- return (1);
-}
-
-static int
-JPEGSetupEncode(TIFF* tif)
-{
- JPEGState* sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
- static const char module[] = "JPEGSetupEncode";
-
- JPEGInitializeLibJPEG( tif, 1, 0 );
-
- assert(sp != NULL);
- assert(!sp->cinfo.comm.is_decompressor);
-
- /*
- * Initialize all JPEG parameters to default values.
- * Note that jpeg_set_defaults needs legal values for
- * in_color_space and input_components.
- */
- sp->cinfo.c.in_color_space = JCS_UNKNOWN;
- sp->cinfo.c.input_components = 1;
- if (!TIFFjpeg_set_defaults(sp))
- return (0);
- /* Set per-file parameters */
- sp->photometric = td->td_photometric;
- switch (sp->photometric) {
- case PHOTOMETRIC_YCBCR:
- sp->h_sampling = td->td_ycbcrsubsampling[0];
- sp->v_sampling = td->td_ycbcrsubsampling[1];
- /*
- * A ReferenceBlackWhite field *must* be present since the
- * default value is inappropriate for YCbCr. Fill in the
- * proper value if application didn't set it.
- */
- {
- 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);
- }
- }
- break;
- case PHOTOMETRIC_PALETTE: /* disallowed by Tech Note */
- case PHOTOMETRIC_MASK:
- TIFFErrorExt(tif->tif_clientdata, module,
- "PhotometricInterpretation %d not allowed for JPEG",
- (int) sp->photometric);
- return (0);
- default:
- /* TIFF 6.0 forbids subsampling of all other color spaces */
- sp->h_sampling = 1;
- sp->v_sampling = 1;
- break;
- }
-
- /* Verify miscellaneous parameters */
-
- /*
- * This would need work if libtiff ever supports different
- * depths for different components, or if libjpeg ever supports
- * run-time selection of depth. Neither is imminent.
- */
-#ifdef JPEG_LIB_MK1
- /* BITS_IN_JSAMPLE now permits 8 and 12 --- dgilbert */
- if (td->td_bitspersample != 8 && td->td_bitspersample != 12)
-#else
- if (td->td_bitspersample != BITS_IN_JSAMPLE )
-#endif
- {
- TIFFErrorExt(tif->tif_clientdata, module, "BitsPerSample %d not allowed for JPEG",
- (int) td->td_bitspersample);
- return (0);
- }
- sp->cinfo.c.data_precision = td->td_bitspersample;
-#ifdef JPEG_LIB_MK1
- sp->cinfo.c.bits_in_jsample = td->td_bitspersample;
-#endif
- if (isTiled(tif)) {
- if ((td->td_tilelength % (sp->v_sampling * DCTSIZE)) != 0) {
- TIFFErrorExt(tif->tif_clientdata, module,
- "JPEG tile height must be multiple of %d",
- sp->v_sampling * DCTSIZE);
- return (0);
- }
- if ((td->td_tilewidth % (sp->h_sampling * DCTSIZE)) != 0) {
- TIFFErrorExt(tif->tif_clientdata, module,
- "JPEG tile width must be multiple of %d",
- sp->h_sampling * DCTSIZE);
- return (0);
- }
- } else {
- if (td->td_rowsperstrip < td->td_imagelength &&
- (td->td_rowsperstrip % (sp->v_sampling * DCTSIZE)) != 0) {
- TIFFErrorExt(tif->tif_clientdata, module,
- "RowsPerStrip must be multiple of %d for JPEG",
- sp->v_sampling * DCTSIZE);
- return (0);
- }
- }
-
- /* Create a JPEGTables field if appropriate */
- if (sp->jpegtablesmode & (JPEGTABLESMODE_QUANT|JPEGTABLESMODE_HUFF)) {
- if ( sp->jpegtables == NULL
- || memcmp(sp->jpegtables,"\0\0\0\0\0\0\0\0\0",8) == 0 )
- {
- if (!prepare_JPEGTables(tif))
- return (0);
- /* Mark the field present */
- /* Can't use TIFFSetField since BEENWRITING is already set! */
- tif->tif_flags |= TIFF_DIRTYDIRECT;
- TIFFSetFieldBit(tif, FIELD_JPEGTABLES);
- }
- } else {
- /* We do not support application-supplied JPEGTables, */
- /* so mark the field not present */
- TIFFClrFieldBit(tif, FIELD_JPEGTABLES);
- }
-
- /* Direct libjpeg output to libtiff's output buffer */
- TIFFjpeg_data_dest(sp, tif);
-
- return (1);
-}
-
-/*
- * Set encoding state at the start of a strip or tile.
- */
-static int
-JPEGPreEncode(TIFF* tif, tsample_t s)
-{
- JPEGState *sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
- static const char module[] = "JPEGPreEncode";
- uint32 segment_width, segment_height;
- int downsampled_input;
-
- assert(sp != NULL);
- assert(!sp->cinfo.comm.is_decompressor);
- /*
- * Set encoding parameters for this strip/tile.
- */
- if (isTiled(tif)) {
- segment_width = td->td_tilewidth;
- segment_height = td->td_tilelength;
- sp->bytesperline = TIFFTileRowSize(tif);
- } else {
- segment_width = td->td_imagewidth;
- segment_height = td->td_imagelength - tif->tif_row;
- if (segment_height > td->td_rowsperstrip)
- segment_height = td->td_rowsperstrip;
- sp->bytesperline = TIFFOldScanlineSize(tif);
- }
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE && s > 0) {
- /* for PC 2, scale down the strip/tile size
- * to match a downsampled component
- */
- segment_width = TIFFhowmany(segment_width, sp->h_sampling);
- segment_height = TIFFhowmany(segment_height, sp->v_sampling);
- }
- if (segment_width > 65535 || segment_height > 65535) {
- TIFFErrorExt(tif->tif_clientdata, module, "Strip/tile too large for JPEG");
- return (0);
- }
- sp->cinfo.c.image_width = segment_width;
- sp->cinfo.c.image_height = segment_height;
- downsampled_input = FALSE;
- if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
- sp->cinfo.c.input_components = td->td_samplesperpixel;
- if (sp->photometric == PHOTOMETRIC_YCBCR) {
- if (sp->jpegcolormode == JPEGCOLORMODE_RGB) {
- sp->cinfo.c.in_color_space = JCS_RGB;
- } else {
- sp->cinfo.c.in_color_space = JCS_YCbCr;
- if (sp->h_sampling != 1 || sp->v_sampling != 1)
- downsampled_input = TRUE;
- }
- if (!TIFFjpeg_set_colorspace(sp, JCS_YCbCr))
- return (0);
- /*
- * Set Y sampling factors;
- * we assume jpeg_set_colorspace() set the rest to 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;
- } else {
- if ((td->td_photometric == PHOTOMETRIC_MINISWHITE || td->td_photometric == PHOTOMETRIC_MINISBLACK) && td->td_samplesperpixel == 1)
- sp->cinfo.c.in_color_space = JCS_GRAYSCALE;
- else if (td->td_photometric == PHOTOMETRIC_RGB)
- sp->cinfo.c.in_color_space = JCS_RGB;
- else if (td->td_photometric == PHOTOMETRIC_SEPARATED && td->td_samplesperpixel == 4)
- sp->cinfo.c.in_color_space = JCS_CMYK;
- else
- sp->cinfo.c.in_color_space = JCS_UNKNOWN;
- if (!TIFFjpeg_set_colorspace(sp, sp->cinfo.c.in_color_space))
- return (0);
- /* jpeg_set_colorspace set all sampling factors to 1 */
- }
- } else {
- sp->cinfo.c.input_components = 1;
- sp->cinfo.c.in_color_space = JCS_UNKNOWN;
- if (!TIFFjpeg_set_colorspace(sp, JCS_UNKNOWN))
- return (0);
- sp->cinfo.c.comp_info[0].component_id = s;
- /* jpeg_set_colorspace() set sampling factors to 1 */
- if (sp->photometric == PHOTOMETRIC_YCBCR && s > 0) {
- sp->cinfo.c.comp_info[0].quant_tbl_no = 1;
- sp->cinfo.c.comp_info[0].dc_tbl_no = 1;
- sp->cinfo.c.comp_info[0].ac_tbl_no = 1;
- }
- }
- /* ensure libjpeg won't write any extraneous markers */
- sp->cinfo.c.write_JFIF_header = FALSE;
- sp->cinfo.c.write_Adobe_marker = FALSE;
- /* set up table handling correctly */
- if (!TIFFjpeg_set_quality(sp, sp->jpegquality, FALSE))
- return (0);
- if (! (sp->jpegtablesmode & JPEGTABLESMODE_QUANT)) {
- unsuppress_quant_table(sp, 0);
- unsuppress_quant_table(sp, 1);
- }
- if (sp->jpegtablesmode & JPEGTABLESMODE_HUFF)
- sp->cinfo.c.optimize_coding = FALSE;
- else
- sp->cinfo.c.optimize_coding = TRUE;
- if (downsampled_input) {
- /* Need to use raw-data interface to libjpeg */
- sp->cinfo.c.raw_data_in = TRUE;
- tif->tif_encoderow = JPEGEncodeRaw;
- tif->tif_encodestrip = JPEGEncodeRaw;
- tif->tif_encodetile = JPEGEncodeRaw;
- } else {
- /* Use normal interface to libjpeg */
- sp->cinfo.c.raw_data_in = FALSE;
- tif->tif_encoderow = JPEGEncode;
- tif->tif_encodestrip = JPEGEncode;
- tif->tif_encodetile = JPEGEncode;
- }
- /* Start JPEG compressor */
- if (!TIFFjpeg_start_compress(sp, FALSE))
- return (0);
- /* Allocate downsampled-data buffers if needed */
- if (downsampled_input) {
- if (!alloc_downsampled_buffers(tif, sp->cinfo.c.comp_info,
- sp->cinfo.c.num_components))
- return (0);
- }
- sp->scancount = 0;
-
- return (1);
-}
-
-/*
- * Encode a chunk of pixels.
- * "Standard" case: incoming data is not downsampled.
- */
-static int
-JPEGEncode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
-{
- JPEGState *sp = JState(tif);
- tsize_t nrows;
- JSAMPROW bufptr[1];
-
- (void) s;
- assert(sp != NULL);
- /* data is expected to be supplied in multiples of a scanline */
- nrows = cc / sp->bytesperline;
- if (cc % sp->bytesperline)
- TIFFWarningExt(tif->tif_clientdata, tif->tif_name, "fractional scanline discarded");
-
- /* The last strip will be limited to image size */
- if ( !isTiled(tif) && tif->tif_row+nrows > tif->tif_dir.td_imagelength )
- nrows = tif->tif_dir.td_imagelength - tif->tif_row;
-
- while (nrows-- > 0) {
- bufptr[0] = (JSAMPROW) buf;
- if (TIFFjpeg_write_scanlines(sp, bufptr, 1) != 1)
- return (0);
- if (nrows > 0)
- tif->tif_row++;
- buf += sp->bytesperline;
- }
- return (1);
-}
-
-/*
- * Encode a chunk of pixels.
- * Incoming data is expected to be downsampled per sampling factors.
- */
-static int
-JPEGEncodeRaw(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
-{
- JPEGState *sp = JState(tif);
- JSAMPLE* inptr;
- JSAMPLE* outptr;
- tsize_t nrows;
- JDIMENSION clumps_per_line, nclump;
- int clumpoffset, ci, xpos, ypos;
- jpeg_component_info* compptr;
- int samples_per_clump = sp->samplesperclump;
- tsize_t bytesperclumpline;
-
- (void) s;
- assert(sp != NULL);
- /* data is expected to be supplied in multiples of a clumpline */
- /* a clumpline is equivalent to v_sampling desubsampled scanlines */
- /* TODO: the following calculation of bytesperclumpline, should substitute calculation of sp->bytesperline, except that it is per v_sampling lines */
- bytesperclumpline = (((sp->cinfo.c.image_width+sp->h_sampling-1)/sp->h_sampling)
- *(sp->h_sampling*sp->v_sampling+2)*sp->cinfo.c.data_precision+7)
- /8;
-
- nrows = ( cc / bytesperclumpline ) * sp->v_sampling;
- if (cc % bytesperclumpline)
- TIFFWarningExt(tif->tif_clientdata, tif->tif_name, "fractional scanline discarded");
-
- /* Cb,Cr both have sampling factors 1, so this is correct */
- clumps_per_line = sp->cinfo.c.comp_info[1].downsampled_width;
-
- while (nrows > 0) {
- /*
- * Fastest way to separate the data is to make one pass
- * over the scanline for each row of each component.
- */
- clumpoffset = 0; /* first sample in clump */
- for (ci = 0, compptr = sp->cinfo.c.comp_info;
- ci < sp->cinfo.c.num_components;
- ci++, compptr++) {
- int hsamp = compptr->h_samp_factor;
- int vsamp = compptr->v_samp_factor;
- int padding = (int) (compptr->width_in_blocks * DCTSIZE -
- clumps_per_line * hsamp);
- for (ypos = 0; ypos < vsamp; ypos++) {
- inptr = ((JSAMPLE*) buf) + clumpoffset;
- outptr = sp->ds_buffer[ci][sp->scancount*vsamp + ypos];
- if (hsamp == 1) {
- /* fast path for at least Cb and Cr */
- for (nclump = clumps_per_line; nclump-- > 0; ) {
- *outptr++ = inptr[0];
- inptr += samples_per_clump;
- }
- } else {
- /* general case */
- for (nclump = clumps_per_line; nclump-- > 0; ) {
- for (xpos = 0; xpos < hsamp; xpos++)
- *outptr++ = inptr[xpos];
- inptr += samples_per_clump;
- }
- }
- /* pad each scanline as needed */
- for (xpos = 0; xpos < padding; xpos++) {
- *outptr = outptr[-1];
- outptr++;
- }
- clumpoffset += hsamp;
- }
- }
- sp->scancount++;
- if (sp->scancount >= DCTSIZE) {
- int n = sp->cinfo.c.max_v_samp_factor * DCTSIZE;
- if (TIFFjpeg_write_raw_data(sp, sp->ds_buffer, n) != n)
- return (0);
- sp->scancount = 0;
- }
- tif->tif_row += sp->v_sampling;
- buf += bytesperclumpline;
- nrows -= sp->v_sampling;
- }
- return (1);
-}
-
-/*
- * Finish up at the end of a strip or tile.
- */
-static int
-JPEGPostEncode(TIFF* tif)
-{
- JPEGState *sp = JState(tif);
-
- if (sp->scancount > 0) {
- /*
- * Need to emit a partial bufferload of downsampled data.
- * Pad the data vertically.
- */
- int ci, ypos, n;
- jpeg_component_info* compptr;
-
- for (ci = 0, compptr = sp->cinfo.c.comp_info;
- ci < sp->cinfo.c.num_components;
- ci++, compptr++) {
- int vsamp = compptr->v_samp_factor;
- tsize_t row_width = compptr->width_in_blocks * DCTSIZE
- * sizeof(JSAMPLE);
- for (ypos = sp->scancount * vsamp;
- ypos < DCTSIZE * vsamp; ypos++) {
- _TIFFmemcpy((tdata_t)sp->ds_buffer[ci][ypos],
- (tdata_t)sp->ds_buffer[ci][ypos-1],
- row_width);
-
- }
- }
- n = sp->cinfo.c.max_v_samp_factor * DCTSIZE;
- if (TIFFjpeg_write_raw_data(sp, sp->ds_buffer, n) != n)
- return (0);
- }
-
- return (TIFFjpeg_finish_compress(JState(tif)));
-}
-
-static void
-JPEGCleanup(TIFF* tif)
-{
- JPEGState *sp = JState(tif);
-
- assert(sp != 0);
-
- tif->tif_tagmethods.vgetfield = sp->vgetparent;
- tif->tif_tagmethods.vsetfield = sp->vsetparent;
- tif->tif_tagmethods.printdir = sp->printdir;
-
- if ( sp->cinfo_initialized )
- TIFFjpeg_destroy(sp); /* release libjpeg resources */
- if (sp->jpegtables) /* tag value */
- _TIFFfree(sp->jpegtables);
- _TIFFfree(tif->tif_data); /* release local state */
- tif->tif_data = NULL;
-
- _TIFFSetDefaultCompressionState(tif);
-}
-
-static void
-JPEGResetUpsampled( TIFF* tif )
-{
- JPEGState* sp = JState(tif);
- TIFFDirectory* td = &tif->tif_dir;
-
- /*
- * Mark whether returned data is up-sampled or not so TIFFStripSize
- * and TIFFTileSize return values that reflect the true amount of
- * data.
- */
- tif->tif_flags &= ~TIFF_UPSAMPLED;
- if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
- if (td->td_photometric == PHOTOMETRIC_YCBCR &&
- sp->jpegcolormode == JPEGCOLORMODE_RGB) {
- tif->tif_flags |= TIFF_UPSAMPLED;
- } else {
-#ifdef notdef
- if (td->td_ycbcrsubsampling[0] != 1 ||
- td->td_ycbcrsubsampling[1] != 1)
- ; /* XXX what about up-sampling? */
-#endif
- }
- }
-
- /*
- * Must recalculate cached tile size in case sampling state changed.
- * Should we really be doing this now if image size isn't set?
- */
- if ( tif->tif_tilesize > 0 )
- tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
-
- if(tif->tif_scanlinesize > 0 )
- tif->tif_scanlinesize = TIFFScanlineSize(tif);
-}
-
-static int
-JPEGVSetField(TIFF* tif, ttag_t tag, va_list ap)
-{
- JPEGState* sp = JState(tif);
- const TIFFFieldInfo* fip;
- uint32 v32;
-
- assert(sp != NULL);
-
- switch (tag) {
- case TIFFTAG_JPEGTABLES:
- v32 = va_arg(ap, uint32);
- if (v32 == 0) {
- /* XXX */
- return (0);
- }
- _TIFFsetByteArray(&sp->jpegtables, va_arg(ap, void*),
- (long) v32);
- sp->jpegtables_length = v32;
- TIFFSetFieldBit(tif, FIELD_JPEGTABLES);
- break;
- case TIFFTAG_JPEGQUALITY:
- sp->jpegquality = va_arg(ap, int);
- return (1); /* pseudo tag */
- case TIFFTAG_JPEGCOLORMODE:
- sp->jpegcolormode = va_arg(ap, int);
- JPEGResetUpsampled( tif );
- return (1); /* pseudo tag */
- case TIFFTAG_PHOTOMETRIC:
- {
- int ret_value = (*sp->vsetparent)(tif, tag, ap);
- JPEGResetUpsampled( tif );
- return ret_value;
- }
- case TIFFTAG_JPEGTABLESMODE:
- sp->jpegtablesmode = va_arg(ap, int);
- return (1); /* pseudo tag */
- case TIFFTAG_YCBCRSUBSAMPLING:
- /* mark the fact that we have a real ycbcrsubsampling! */
- sp->ycbcrsampling_fetched = 1;
- /* should we be recomputing upsampling info here? */
- return (*sp->vsetparent)(tif, tag, ap);
- case TIFFTAG_FAXRECVPARAMS:
- sp->recvparams = va_arg(ap, uint32);
- break;
- case TIFFTAG_FAXSUBADDRESS:
- _TIFFsetString(&sp->subaddress, va_arg(ap, char*));
- break;
- case TIFFTAG_FAXRECVTIME:
- sp->recvtime = va_arg(ap, uint32);
- break;
- case TIFFTAG_FAXDCS:
- _TIFFsetString(&sp->faxdcs, va_arg(ap, char*));
- break;
- default:
- return (*sp->vsetparent)(tif, tag, ap);
- }
-
- if ((fip = _TIFFFieldWithTag(tif, tag))) {
- TIFFSetFieldBit(tif, fip->field_bit);
- } else {
- return (0);
- }
-
- tif->tif_flags |= TIFF_DIRTYDIRECT;
- return (1);
-}
-
-/*
- * Some JPEG-in-TIFF produces do not emit the YCBCRSUBSAMPLING values in
- * the TIFF tags, but still use non-default (2,2) values within the jpeg
- * data stream itself. In order for TIFF applications to work properly
- * - for instance to get the strip buffer size right - it is imperative
- * that the subsampling be available before we start reading the image
- * data normally. This function will attempt to load the first strip in
- * order to get the sampling values from the jpeg data stream. Various
- * hacks are various places are done to ensure this function gets called
- * before the td_ycbcrsubsampling values are used from the directory structure,
- * including calling TIFFGetField() for the YCBCRSUBSAMPLING field from
- * TIFFStripSize(), and the printing code in tif_print.c.
- *
- * Note that JPEGPreDeocode() will produce a fairly loud warning when the
- * discovered sampling does not match the default sampling (2,2) or whatever
- * was actually in the tiff tags.
- *
- * Problems:
- * o This code will cause one whole strip/tile of compressed data to be
- * loaded just to get the tags right, even if the imagery is never read.
- * It would be more efficient to just load a bit of the header, and
- * initialize things from that.
- *
- * See the bug in bugzilla for details:
- *
- * http://bugzilla.remotesensing.org/show_bug.cgi?id=168
- *
- * Frank Warmerdam, July 2002
- */
-
-static void
-JPEGFixupTestSubsampling( TIFF * tif )
-{
-#ifdef CHECK_JPEG_YCBCR_SUBSAMPLING
- JPEGState *sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
-
- JPEGInitializeLibJPEG( tif, 0, 0 );
-
- /*
- * Some JPEG-in-TIFF files don't provide the ycbcrsampling tags,
- * and use a sampling schema other than the default 2,2. To handle
- * this we actually have to scan the header of a strip or tile of
- * jpeg data to get the sampling.
- */
- if ( !sp->cinfo.comm.is_decompressor
- || sp->ycbcrsampling_fetched
- || td->td_photometric != PHOTOMETRIC_YCBCR )
- return;
-
- sp->ycbcrsampling_fetched = 1;
- if ( TIFFIsTiled( tif ) )
- {
- if ( !TIFFFillTile( tif, 0 ) )
- return;
- }
- else
- {
- if ( !TIFFFillStrip( tif, 0 ) )
- return;
- }
-
- TIFFSetField( tif, TIFFTAG_YCBCRSUBSAMPLING,
- (uint16) sp->h_sampling, (uint16) sp->v_sampling );
-
- /*
- ** We want to clear the loaded strip so the application has time
- ** to set JPEGCOLORMODE or other behavior modifiers. This essentially
- ** undoes the JPEGPreDecode triggers by TIFFFileStrip(). (#1936)
- */
- tif->tif_curstrip = -1;
-
-#endif /* CHECK_JPEG_YCBCR_SUBSAMPLING */
-}
-
-static int
-JPEGVGetField(TIFF* tif, ttag_t tag, va_list ap)
-{
- JPEGState* sp = JState(tif);
-
- assert(sp != NULL);
-
- switch (tag) {
- case TIFFTAG_JPEGTABLES:
- *va_arg(ap, uint32*) = sp->jpegtables_length;
- *va_arg(ap, void**) = sp->jpegtables;
- break;
- case TIFFTAG_JPEGQUALITY:
- *va_arg(ap, int*) = sp->jpegquality;
- break;
- case TIFFTAG_JPEGCOLORMODE:
- *va_arg(ap, int*) = sp->jpegcolormode;
- break;
- case TIFFTAG_JPEGTABLESMODE:
- *va_arg(ap, int*) = sp->jpegtablesmode;
- break;
- case TIFFTAG_YCBCRSUBSAMPLING:
- JPEGFixupTestSubsampling( tif );
- return (*sp->vgetparent)(tif, tag, ap);
- case TIFFTAG_FAXRECVPARAMS:
- *va_arg(ap, uint32*) = sp->recvparams;
- break;
- case TIFFTAG_FAXSUBADDRESS:
- *va_arg(ap, char**) = sp->subaddress;
- break;
- case TIFFTAG_FAXRECVTIME:
- *va_arg(ap, uint32*) = sp->recvtime;
- break;
- case TIFFTAG_FAXDCS:
- *va_arg(ap, char**) = sp->faxdcs;
- break;
- default:
- return (*sp->vgetparent)(tif, tag, ap);
- }
- return (1);
-}
-
-static void
-JPEGPrintDir(TIFF* tif, FILE* fd, long flags)
-{
- JPEGState* sp = JState(tif);
-
- assert(sp != NULL);
-
- (void) flags;
- if (TIFFFieldSet(tif,FIELD_JPEGTABLES))
- fprintf(fd, " JPEG Tables: (%lu bytes)\n",
- (unsigned long) sp->jpegtables_length);
- if (TIFFFieldSet(tif,FIELD_RECVPARAMS))
- fprintf(fd, " Fax Receive Parameters: %08lx\n",
- (unsigned long) sp->recvparams);
- if (TIFFFieldSet(tif,FIELD_SUBADDRESS))
- fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress);
- if (TIFFFieldSet(tif,FIELD_RECVTIME))
- fprintf(fd, " Fax Receive Time: %lu secs\n",
- (unsigned long) sp->recvtime);
- if (TIFFFieldSet(tif,FIELD_FAXDCS))
- fprintf(fd, " Fax DCS: %s\n", sp->faxdcs);
-}
-
-static uint32
-JPEGDefaultStripSize(TIFF* tif, uint32 s)
-{
- JPEGState* sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
-
- s = (*sp->defsparent)(tif, s);
- if (s < td->td_imagelength)
- s = TIFFroundup(s, td->td_ycbcrsubsampling[1] * DCTSIZE);
- return (s);
-}
-
-static void
-JPEGDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
-{
- JPEGState* sp = JState(tif);
- TIFFDirectory *td = &tif->tif_dir;
-
- (*sp->deftparent)(tif, tw, th);
- *tw = TIFFroundup(*tw, td->td_ycbcrsubsampling[0] * DCTSIZE);
- *th = TIFFroundup(*th, td->td_ycbcrsubsampling[1] * DCTSIZE);
-}
-
-/*
- * The JPEG library initialized used to be done in TIFFInitJPEG(), but
- * now that we allow a TIFF file to be opened in update mode it is necessary
- * to have some way of deciding whether compression or decompression is
- * desired other than looking at tif->tif_mode. We accomplish this by
- * examining {TILE/STRIP}BYTECOUNTS to see if there is a non-zero entry.
- * If so, we assume decompression is desired.
- *
- * This is tricky, because TIFFInitJPEG() is called while the directory is
- * being read, and generally speaking the BYTECOUNTS tag won't have been read
- * at that point. So we try to defer jpeg library initialization till we
- * do have that tag ... basically any access that might require the compressor
- * or decompressor that occurs after the reading of the directory.
- *
- * In an ideal world compressors or decompressors would be setup
- * at the point where a single tile or strip was accessed (for read or write)
- * so that stuff like update of missing tiles, or replacement of tiles could
- * be done. However, we aren't trying to crack that nut just yet ...
- *
- * NFW, Feb 3rd, 2003.
- */
-
-static int JPEGInitializeLibJPEG( TIFF * tif, int force_encode, int force_decode )
-{
- JPEGState* sp = JState(tif);
- uint32 *byte_counts = NULL;
- int data_is_empty = TRUE;
- int decompress;
-
-
- if(sp->cinfo_initialized)
- {
- if ( force_encode && sp->cinfo.comm.is_decompressor )
- TIFFjpeg_destroy( sp );
- else if ( force_decode && !sp->cinfo.comm.is_decompressor )
- TIFFjpeg_destroy( sp );
- else
- return 1;
-
- sp->cinfo_initialized = 0;
- }
-
- /*
- * Do we have tile data already? Make sure we initialize the
- * the state in decompressor mode if we have tile data, even if we
- * are not in read-only file access mode.
- */
- if ( TIFFIsTiled( tif )
- && TIFFGetField( tif, TIFFTAG_TILEBYTECOUNTS, &byte_counts )
- && byte_counts != NULL )
- {
- data_is_empty = byte_counts[0] == 0;
- }
- if ( !TIFFIsTiled( tif )
- && TIFFGetField( tif, TIFFTAG_STRIPBYTECOUNTS, &byte_counts)
- && byte_counts != NULL )
- {
- data_is_empty = byte_counts[0] == 0;
- }
-
- if ( force_decode )
- decompress = 1;
- else if ( force_encode )
- decompress = 0;
- else if ( tif->tif_mode == O_RDONLY )
- decompress = 1;
- else if ( data_is_empty )
- decompress = 0;
- else
- decompress = 1;
-
- /*
- * Initialize libjpeg.
- */
- if ( decompress ) {
- if (!TIFFjpeg_create_decompress(sp))
- return (0);
-
- } else {
- if (!TIFFjpeg_create_compress(sp))
- return (0);
- }
-
- sp->cinfo_initialized = TRUE;
-
- return 1;
-}
-
-int
-TIFFInitJPEG(TIFF* tif, int scheme)
-{
- JPEGState* sp;
-
- assert(scheme == COMPRESSION_JPEG);
-
- /*
- * Merge codec-specific tag information.
- */
- if (!_TIFFMergeFieldInfo(tif, jpegFieldInfo, N(jpegFieldInfo))) {
- TIFFErrorExt(tif->tif_clientdata,
- "TIFFInitJPEG",
- "Merging JPEG codec-specific tags failed");
- return 0;
- }
-
- /*
- * Allocate state block so tag methods have storage to record values.
- */
- tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (JPEGState));
-
- if (tif->tif_data == NULL) {
- TIFFErrorExt(tif->tif_clientdata,
- "TIFFInitJPEG", "No space for JPEG state block");
- return 0;
- }
- _TIFFmemset(tif->tif_data, 0, sizeof(JPEGState));
-
- sp = JState(tif);
- sp->tif = tif; /* back link */
-
- /*
- * Override parent get/set field methods.
- */
- sp->vgetparent = tif->tif_tagmethods.vgetfield;
- tif->tif_tagmethods.vgetfield = JPEGVGetField; /* hook for codec tags */
- sp->vsetparent = tif->tif_tagmethods.vsetfield;
- tif->tif_tagmethods.vsetfield = JPEGVSetField; /* hook for codec tags */
- sp->printdir = tif->tif_tagmethods.printdir;
- tif->tif_tagmethods.printdir = JPEGPrintDir; /* hook for codec tags */
-
- /* Default values for codec-specific fields */
- sp->jpegtables = NULL;
- sp->jpegtables_length = 0;
- sp->jpegquality = 75; /* Default IJG quality */
- sp->jpegcolormode = JPEGCOLORMODE_RAW;
- sp->jpegtablesmode = JPEGTABLESMODE_QUANT | JPEGTABLESMODE_HUFF;
-
- sp->recvparams = 0;
- sp->subaddress = NULL;
- sp->faxdcs = NULL;
-
- sp->ycbcrsampling_fetched = 0;
-
- /*
- * Install codec methods.
- */
- tif->tif_setupdecode = JPEGSetupDecode;
- tif->tif_predecode = JPEGPreDecode;
- tif->tif_decoderow = JPEGDecode;
- tif->tif_decodestrip = JPEGDecode;
- tif->tif_decodetile = JPEGDecode;
- tif->tif_setupencode = JPEGSetupEncode;
- tif->tif_preencode = JPEGPreEncode;
- tif->tif_postencode = JPEGPostEncode;
- tif->tif_encoderow = JPEGEncode;
- tif->tif_encodestrip = JPEGEncode;
- tif->tif_encodetile = JPEGEncode;
- tif->tif_cleanup = JPEGCleanup;
- sp->defsparent = tif->tif_defstripsize;
- tif->tif_defstripsize = JPEGDefaultStripSize;
- sp->deftparent = tif->tif_deftilesize;
- tif->tif_deftilesize = JPEGDefaultTileSize;
- tif->tif_flags |= TIFF_NOBITREV; /* no bit reversal, please */
-
- sp->cinfo_initialized = FALSE;
-
- /*
- ** Create a JPEGTables field if no directory has yet been created.
- ** We do this just to ensure that sufficient space is reserved for
- ** the JPEGTables field. It will be properly created the right
- ** size later.
- */
- if ( tif->tif_diroff == 0 )
- {
-#define SIZE_OF_JPEGTABLES 2000
-/*
-The following line assumes incorrectly that all JPEG-in-TIFF files will have
-a JPEGTABLES tag generated and causes null-filled JPEGTABLES tags to be written
-when the JPEG data is placed with TIFFWriteRawStrip. The field bit should be
-set, anyway, later when actual JPEGTABLES header is generated, so removing it
-here hopefully is harmless.
- TIFFSetFieldBit(tif, FIELD_JPEGTABLES);
-*/
- sp->jpegtables_length = SIZE_OF_JPEGTABLES;
- sp->jpegtables = (void *) _TIFFmalloc(sp->jpegtables_length);
- _TIFFmemset(sp->jpegtables, 0, SIZE_OF_JPEGTABLES);
-#undef SIZE_OF_JPEGTABLES
- }
-
- /*
- * Mark the TIFFTAG_YCBCRSAMPLES as present even if it is not
- * see: JPEGFixupTestSubsampling().
- */
- TIFFSetFieldBit( tif, FIELD_YCBCRSUBSAMPLING );
-
- return 1;
-}
-#endif /* JPEG_SUPPORT */
-
-/* vim: set ts=8 sts=8 sw=8 noet: */
-
-/*
- * Local Variables:
- * mode: c
- * c-basic-offset: 8
- * fill-column: 78
- * End:
- */
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