--- /dev/null
+/* $Id: tif_jpeg.c,v 1.1 2005-06-17 13:54:52 vp153 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.
+ */
+
+#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
+
+
+/*
+ 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)
+# 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 "jpeglib.h"
+#include "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 */
+ 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 );
+
+#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);
+ TIFFError("JPEGLib", 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);
+ TIFFWarning("JPEGLib", 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;
+ TIFFError("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 );
+
+ 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) {
+ TIFFError("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 = TIFFScanlineSize(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) {
+ TIFFWarning(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.num_components !=
+ (td->td_planarconfig == PLANARCONFIG_CONTIG ?
+ td->td_samplesperpixel : 1)) {
+ 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);
+ }
+ 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) {
+ TIFFWarning(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);
+
+ /*
+ * 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)) {
+ TIFFWarning(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) {
+ TIFFError(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) {
+ TIFFError(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;
+
+ nrows = cc / sp->bytesperline;
+ if (cc % sp->bytesperline)
+ TIFFWarning(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)
+ {
+ do {
+ 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);
+ }
+ /* 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;
+
+ /* data is expected to be read in multiples of a scanline */
+ if ( (nrows = sp->cinfo.d.image_height) ) {
+ /* 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;
+
+ 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];
+ JSAMPLE *outptr = (JSAMPLE*)buf + clumpoffset;
+ 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;
+ }
+ }
+ ++sp->scancount;
+ ++tif->tif_row;
+ buf += sp->bytesperline;
+ cc -= sp->bytesperline;
+ } while (--nrows > 0);
+ }
+
+ /* 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 );
+
+ /* 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 );
+
+ 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.
+ */
+ 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);
+ }
+ break;
+ case PHOTOMETRIC_PALETTE: /* disallowed by Tech Note */
+ case PHOTOMETRIC_MASK:
+ TIFFError(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.
+ */
+ if (td->td_bitspersample != BITS_IN_JSAMPLE) {
+ TIFFError(module, "BitsPerSample %d not allowed for JPEG",
+ (int) td->td_bitspersample);
+ return (0);
+ }
+ sp->cinfo.c.data_precision = td->td_bitspersample;
+ if (isTiled(tif)) {
+ if ((td->td_tilelength % (sp->v_sampling * DCTSIZE)) != 0) {
+ TIFFError(module,
+ "JPEG tile height must be multiple of %d",
+ sp->v_sampling * DCTSIZE);
+ return (0);
+ }
+ if ((td->td_tilewidth % (sp->h_sampling * DCTSIZE)) != 0) {
+ TIFFError(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) {
+ TIFFError(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 (!prepare_JPEGTables(tif))
+ return (0);
+ /* Mark the field present */
+ /* Can't use TIFFSetField since BEENWRITING is already set! */
+ TIFFSetFieldBit(tif, FIELD_JPEGTABLES);
+ tif->tif_flags |= TIFF_DIRTYDIRECT;
+ } 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 = TIFFScanlineSize(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) {
+ TIFFError(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 {
+ sp->cinfo.c.in_color_space = JCS_UNKNOWN;
+ if (!TIFFjpeg_set_colorspace(sp, JCS_UNKNOWN))
+ 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 (! (sp->jpegtablesmode & JPEGTABLESMODE_QUANT)) {
+ if (!TIFFjpeg_set_quality(sp, sp->jpegquality, FALSE))
+ return (0);
+ 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)
+ TIFFWarning(tif->tif_name, "fractional scanline discarded");
+
+ 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;
+
+ (void) s;
+ assert(sp != NULL);
+ /* data is expected to be supplied in multiples of a scanline */
+ nrows = cc / sp->bytesperline;
+ if (cc % sp->bytesperline)
+ TIFFWarning(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;
+ }
+ if (nrows > 0)
+ tif->tif_row++;
+ buf += sp->bytesperline;
+ }
+ 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)
+{
+ if (tif->tif_data) {
+ JPEGState *sp = JState(tif);
+ 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;
+ }
+}
+
+static int
+JPEGVSetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+ JPEGState* sp = JState(tif);
+ TIFFDirectory* td = &tif->tif_dir;
+ uint32 v32;
+
+ 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);
+ /*
+ * 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 {
+ if (td->td_ycbcrsubsampling[0] != 1 ||
+ td->td_ycbcrsubsampling[1] != 1)
+ ; /* XXX what about up-sampling? */
+ }
+ }
+ /*
+ * Must recalculate cached tile size
+ * in case sampling state changed.
+ */
+ tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
+ return (1); /* pseudo tag */
+ 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;
+ 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);
+ }
+ TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
+ 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 );
+
+ /*
+ * 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 );
+#endif /* CHECK_JPEG_YCBCR_SUBSAMPLING */
+}
+
+static int
+JPEGVGetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+ JPEGState* sp = JState(tif);
+
+ 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);
+ break;
+ 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);
+
+ (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 )
+{
+ JPEGState* sp = JState(tif);
+ uint32 *byte_counts = NULL;
+ int data_is_empty = TRUE;
+
+ if( sp->cinfo_initialized )
+ return 1;
+
+ /*
+ * 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;
+ }
+
+ /*
+ * Initialize libjpeg.
+ */
+ if (tif->tif_mode == O_RDONLY || !data_is_empty ) {
+ 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);
+
+ /*
+ * Allocate state block so tag methods have storage to record values.
+ */
+ tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (JPEGState));
+
+ if (tif->tif_data == NULL) {
+ TIFFError("TIFFInitJPEG", "No space for JPEG state block");
+ return (0);
+ }
+ _TIFFmemset( tif->tif_data, 0, sizeof(JPEGState));
+
+ sp = JState(tif);
+ sp->tif = tif; /* back link */
+
+ /*
+ * Merge codec-specific tag information and
+ * override parent get/set field methods.
+ */
+ _TIFFMergeFieldInfo(tif, jpegFieldInfo, N(jpegFieldInfo));
+ 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 */
+ 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;
+
+ /*
+ * 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: */
projects / opencv / blobdiff