| /* $Id: tif_jpeg.c,v 1.50.2.4 2009-08-30 16:21:46 bfriesen 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 "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 */ |
| 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; |
| |
| /* 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; |
| |
| #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; |
| nrows -= sp->v_sampling; |
| } 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 (!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 = 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 { |
| 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) |
| 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 += sp->bytesperline; |
| 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? |
| */ |
| tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1; |
| } |
| |
| 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 ); |
| #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 |
| 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: */ |
| |