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|
/* ************************************************************************** */
/* * For conditions of distribution and use, * */
/* * see copyright notice in libmng.h * */
/* ************************************************************************** */
/* * * */
/* * project : libmng * */
/* * file : libmng_jpeg.c copyright (c) 2000-2004 G.Juyn * */
/* * version : 1.0.9 * */
/* * * */
/* * purpose : JPEG library interface (implementation) * */
/* * * */
/* * author : G.Juyn * */
/* * * */
/* * comment : implementation of the JPEG library interface * */
/* * * */
/* * changes : 0.5.1 - 05/08/2000 - G.Juyn * */
/* * - changed strict-ANSI stuff * */
/* * * */
/* * 0.5.2 - 05/22/2000 - G.Juyn * */
/* * - implemented all the JNG routines * */
/* * * */
/* * 0.5.3 - 06/17/2000 - G.Juyn * */
/* * - added tracing of JPEG calls * */
/* * 0.5.3 - 06/24/2000 - G.Juyn * */
/* * - fixed inclusion of IJG read/write code * */
/* * 0.5.3 - 06/29/2000 - G.Juyn * */
/* * - fixed some 64-bit warnings * */
/* * * */
/* * 0.9.2 - 08/05/2000 - G.Juyn * */
/* * - changed file-prefixes * */
/* * * */
/* * 0.9.3 - 10/16/2000 - G.Juyn * */
/* * - added support for JDAA * */
/* * * */
/* * 1.0.1 - 04/19/2001 - G.Juyn * */
/* * - added export of JPEG functions for DLL * */
/* * 1.0.1 - 04/22/2001 - G.Juyn * */
/* * - fixed memory-leaks (Thanks Gregg!) * */
/* * * */
/* * 1.0.4 - 06/22/2002 - G.Juyn * */
/* * - B526138 - returned IJGSRC6B calling convention to * */
/* * default for MSVC * */
/* * * */
/* * 1.0.5 - 24/02/2003 - G.Juyn * */
/* * - B683152 - libjpeg suspension not always honored correctly* */
/* * * */
/* * 1.0.6 - 03/04/2003 - G.Juyn * */
/* * - fixed some compiler-warnings * */
/* * * */
/* * 1.0.8 - 08/01/2004 - G.Juyn * */
/* * - added support for 3+byte pixelsize for JPEG's * */
/* * * */
/* * 1.0.9 - 12/20/2004 - G.Juyn * */
/* * - cleaned up macro-invocations (thanks to D. Airlie) * */
/* * * */
/* ************************************************************************** */
#include "libmng.h"
#include "libmng_data.h"
#include "libmng_error.h"
#include "libmng_trace.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "libmng_memory.h"
#include "libmng_pixels.h"
#include "libmng_jpeg.h"
#if defined(__BORLANDC__) && defined(MNG_STRICT_ANSI)
#pragma option -A /* force ANSI-C */
#endif
/* ************************************************************************** */
#if defined(MNG_INCLUDE_JNG) && defined(MNG_INCLUDE_DISPLAY_PROCS)
/* ************************************************************************** */
/* * * */
/* * Local IJG callback routines (source-manager, error-manager and such) * */
/* * * */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_IJG6B
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_init_source (j_decompress_ptr cinfo)
#else
void mng_init_source (j_decompress_ptr cinfo)
#endif
{
return; /* nothing needed */
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
boolean MNG_DECL mng_fill_input_buffer (j_decompress_ptr cinfo)
#else
boolean mng_fill_input_buffer (j_decompress_ptr cinfo)
#endif
{
return FALSE; /* force IJG routine to return to caller */
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
#else
void mng_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
#endif
{
if (num_bytes > 0) /* ignore fony calls */
{ /* address my generic structure */
mng_datap pData = (mng_datap)cinfo->client_data;
/* address source manager */
mngjpeg_sourcep pSrc = pData->pJPEGdinfo->src;
/* problem scenario ? */
if (pSrc->bytes_in_buffer < (size_t)num_bytes)
{ /* tell the boss we need to skip some data! */
pData->iJPEGtoskip = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer);
pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */
pSrc->next_input_byte = MNG_NULL;
}
else
{ /* simply advance in the buffer */
pSrc->bytes_in_buffer -= num_bytes;
pSrc->next_input_byte += num_bytes;
}
}
return;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes)
#else
void mng_skip_input_data2 (j_decompress_ptr cinfo, long num_bytes)
#endif
{
if (num_bytes > 0) /* ignore fony calls */
{ /* address my generic structure */
mng_datap pData = (mng_datap)cinfo->client_data;
/* address source manager */
mngjpeg_sourcep pSrc = pData->pJPEGdinfo2->src;
/* problem scenario ? */
if (pSrc->bytes_in_buffer < (size_t)num_bytes)
{ /* tell the boss we need to skip some data! */
pData->iJPEGtoskip2 = (mng_uint32)((size_t)num_bytes - pSrc->bytes_in_buffer);
pSrc->bytes_in_buffer = 0; /* let the JPEG lib suspend */
pSrc->next_input_byte = MNG_NULL;
}
else
{ /* simply advance in the buffer */
pSrc->bytes_in_buffer -= num_bytes;
pSrc->next_input_byte += num_bytes;
}
}
return;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_term_source (j_decompress_ptr cinfo)
#else
void mng_term_source (j_decompress_ptr cinfo)
#endif
{
return; /* nothing needed */
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_USE_SETJMP
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_error_exit (j_common_ptr cinfo)
#else
void mng_error_exit (j_common_ptr cinfo)
#endif
{ /* address my generic structure */
mng_datap pData = (mng_datap)cinfo->client_data;
#ifdef MNG_ERROR_TELLTALE /* fill the message text ??? */
(*cinfo->err->output_message) (cinfo);
#endif
/* return to the point of no return... */
longjmp (pData->sErrorbuf, cinfo->err->msg_code);
}
#endif /* MNG_USE_SETJMP */
/* ************************************************************************** */
#ifdef MNG_USE_SETJMP
#ifdef MNG_DEFINE_JPEG_STDCALL
void MNG_DECL mng_output_message (j_common_ptr cinfo)
#else
void mng_output_message (j_common_ptr cinfo)
#endif
{
return; /* just do nothing ! */
}
#endif /* MNG_USE_SETJMP */
/* ************************************************************************** */
#endif /* MNG_INCLUDE_IJG6B */
/* ************************************************************************** */
/* * * */
/* * Global JPEG routines * */
/* * * */
/* ************************************************************************** */
mng_retcode mngjpeg_initialize (mng_datap pData)
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_START);
#endif
/* allocate space for JPEG structures if necessary */
#ifdef MNG_INCLUDE_JNG_READ
if (pData->pJPEGderr == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGderr, sizeof (mngjpeg_error ));
if (pData->pJPEGdsrc == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source));
if (pData->pJPEGdinfo == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp));
/* enable reverse addressing */
pData->pJPEGdinfo->client_data = pData;
if (pData->pJPEGderr2 == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGderr2, sizeof (mngjpeg_error ));
if (pData->pJPEGdsrc2 == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source));
if (pData->pJPEGdinfo2 == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp));
/* enable reverse addressing */
pData->pJPEGdinfo2->client_data = pData;
#endif
#ifdef MNG_INCLUDE_JNG_WRITE
if (pData->pJPEGcerr == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGcerr, sizeof (mngjpeg_error ));
if (pData->pJPEGcinfo == MNG_NULL)
MNG_ALLOC (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp ));
/* enable reverse addressing */
pData->pJPEGcinfo->client_data = pData;
#endif
if (pData->pJPEGbuf == MNG_NULL) /* initialize temporary buffers */
{
pData->iJPEGbufmax = MNG_JPEG_MAXBUF;
MNG_ALLOC (pData, pData->pJPEGbuf, pData->iJPEGbufmax);
}
if (pData->pJPEGbuf2 == MNG_NULL)
{
pData->iJPEGbufmax2 = MNG_JPEG_MAXBUF;
MNG_ALLOC (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2);
}
pData->pJPEGcurrent = pData->pJPEGbuf;
pData->iJPEGbufremain = 0;
pData->pJPEGrow = MNG_NULL;
pData->iJPEGrowlen = 0;
pData->iJPEGtoskip = 0;
pData->pJPEGcurrent2 = pData->pJPEGbuf2;
pData->iJPEGbufremain2 = 0;
pData->pJPEGrow2 = MNG_NULL;
pData->iJPEGrowlen2 = 0;
pData->iJPEGtoskip2 = 0;
/* not doing anything yet ! */
pData->bJPEGcompress = MNG_FALSE;
pData->bJPEGdecompress = MNG_FALSE;
pData->bJPEGhasheader = MNG_FALSE;
pData->bJPEGdecostarted = MNG_FALSE;
pData->bJPEGscanstarted = MNG_FALSE;
pData->bJPEGscanending = MNG_FALSE;
pData->bJPEGdecompress2 = MNG_FALSE;
pData->bJPEGhasheader2 = MNG_FALSE;
pData->bJPEGdecostarted2 = MNG_FALSE;
pData->bJPEGscanstarted2 = MNG_FALSE;
pData->iJPEGrow = 0; /* zero input/output lines */
pData->iJPEGalpharow = 0;
pData->iJPEGrgbrow = 0;
pData->iJPEGdisprow = 0;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_INITIALIZE, MNG_LC_END);
#endif
return MNG_NOERROR;
}
/* ************************************************************************** */
mng_retcode mngjpeg_cleanup (mng_datap pData)
{
#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
mng_retcode iRetcode;
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_START);
#endif
#ifdef MNG_INCLUDE_IJG6B
#ifdef MNG_USE_SETJMP
iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif
#ifdef MNG_INCLUDE_JNG_READ /* still decompressing something ? */
if (pData->bJPEGdecompress)
jpeg_destroy_decompress (pData->pJPEGdinfo);
if (pData->bJPEGdecompress2)
jpeg_destroy_decompress (pData->pJPEGdinfo2);
#endif
#ifdef MNG_INCLUDE_JNG_WRITE
if (pData->bJPEGcompress) /* still compressing something ? */
jpeg_destroy_compress (pData->pJPEGcinfo);
#endif
#endif /* MNG_INCLUDE_IJG6B */
/* cleanup temporary buffers */
MNG_FREE (pData, pData->pJPEGbuf2, pData->iJPEGbufmax2);
MNG_FREE (pData, pData->pJPEGbuf, pData->iJPEGbufmax);
/* cleanup space for JPEG structures */
#ifdef MNG_INCLUDE_JNG_WRITE
MNG_FREE (pData, pData->pJPEGcinfo, sizeof (mngjpeg_comp ));
MNG_FREE (pData, pData->pJPEGcerr, sizeof (mngjpeg_error ));
#endif
#ifdef MNG_INCLUDE_JNG_READ
MNG_FREE (pData, pData->pJPEGdinfo, sizeof (mngjpeg_decomp));
MNG_FREE (pData, pData->pJPEGdsrc, sizeof (mngjpeg_source));
MNG_FREE (pData, pData->pJPEGderr, sizeof (mngjpeg_error ));
MNG_FREE (pData, pData->pJPEGdinfo2, sizeof (mngjpeg_decomp));
MNG_FREE (pData, pData->pJPEGdsrc2, sizeof (mngjpeg_source));
MNG_FREE (pData, pData->pJPEGderr2, sizeof (mngjpeg_error ));
#endif
MNG_FREE (pData, pData->pJPEGrow2, pData->iJPEGrowlen2);
MNG_FREE (pData, pData->pJPEGrow, pData->iJPEGrowlen);
/* whatever we were doing ... */
/* we don't anymore ... */
pData->bJPEGcompress = MNG_FALSE;
pData->bJPEGdecompress = MNG_FALSE;
pData->bJPEGhasheader = MNG_FALSE;
pData->bJPEGdecostarted = MNG_FALSE;
pData->bJPEGscanstarted = MNG_FALSE;
pData->bJPEGscanending = MNG_FALSE;
pData->bJPEGdecompress2 = MNG_FALSE;
pData->bJPEGhasheader2 = MNG_FALSE;
pData->bJPEGdecostarted2 = MNG_FALSE;
pData->bJPEGscanstarted2 = MNG_FALSE;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_CLEANUP, MNG_LC_END);
#endif
return MNG_NOERROR;
}
/* ************************************************************************** */
/* * * */
/* * JPEG decompression routines (JDAT) * */
/* * * */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
mng_retcode mngjpeg_decompressinit (mng_datap pData)
{
#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
mng_retcode iRetcode;
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_START);
#endif
#ifdef MNG_INCLUDE_IJG6B
/* allocate and initialize a JPEG decompression object */
pData->pJPEGdinfo->err = jpeg_std_error (pData->pJPEGderr);
#ifdef MNG_USE_SETJMP /* setup local JPEG error-routines */
pData->pJPEGderr->error_exit = mng_error_exit;
pData->pJPEGderr->output_message = mng_output_message;
iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif /* MNG_USE_SETJMP */
/* allocate and initialize a JPEG decompression object (continued) */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_JPEG_CREATE_DECOMPRESS)
#endif
jpeg_create_decompress (pData->pJPEGdinfo);
pData->bJPEGdecompress = MNG_TRUE; /* indicate it's initialized */
/* specify the source of the compressed data (eg, a file) */
/* no, not a file; we have buffered input */
pData->pJPEGdinfo->src = pData->pJPEGdsrc;
/* use the default handler */
pData->pJPEGdinfo->src->resync_to_restart = jpeg_resync_to_restart;
/* setup local source routine & parms */
pData->pJPEGdinfo->src->init_source = mng_init_source;
pData->pJPEGdinfo->src->fill_input_buffer = mng_fill_input_buffer;
pData->pJPEGdinfo->src->skip_input_data = mng_skip_input_data;
pData->pJPEGdinfo->src->term_source = mng_term_source;
pData->pJPEGdinfo->src->next_input_byte = pData->pJPEGcurrent;
pData->pJPEGdinfo->src->bytes_in_buffer = pData->iJPEGbufremain;
#endif /* MNG_INCLUDE_IJG6B */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_END);
#endif
return MNG_NOERROR;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
mng_retcode mngjpeg_decompressdata (mng_datap pData,
mng_uint32 iRawsize,
mng_uint8p pRawdata)
{
mng_retcode iRetcode;
mng_uint32 iRemain;
mng_uint8p pWork;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_START);
#endif
#if defined (MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
iRetcode = setjmp (pData->sErrorbuf);/* initialize local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif
pWork = pRawdata;
iRemain = iRawsize;
if (pData->iJPEGtoskip) /* JPEG-lib told us to skip some more data ? */
{
if (iRemain > pData->iJPEGtoskip) /* enough data in this buffer ? */
{
iRemain -= pData->iJPEGtoskip; /* skip enough to access the next byte */
pWork += pData->iJPEGtoskip;
pData->iJPEGtoskip = 0; /* no more to skip then */
}
else
{
pData->iJPEGtoskip -= iRemain; /* skip all data in the buffer */
iRemain = 0; /* and indicate this accordingly */
}
/* the skip set current-pointer to NULL ! */
pData->pJPEGcurrent = pData->pJPEGbuf;
}
while (iRemain) /* repeat until no more input-bytes */
{ /* need to shift anything ? */
if ((pData->pJPEGcurrent > pData->pJPEGbuf) &&
(pData->pJPEGcurrent - pData->pJPEGbuf + pData->iJPEGbufremain + iRemain > pData->iJPEGbufmax))
{
if (pData->iJPEGbufremain > 0) /* then do so */
MNG_COPY (pData->pJPEGbuf, pData->pJPEGcurrent, pData->iJPEGbufremain);
pData->pJPEGcurrent = pData->pJPEGbuf;
}
/* does the remaining input fit into the buffer ? */
if (pData->iJPEGbufremain + iRemain <= pData->iJPEGbufmax)
{ /* move the lot */
MNG_COPY ((pData->pJPEGcurrent + pData->iJPEGbufremain), pWork, iRemain);
pData->iJPEGbufremain += iRemain;/* adjust remaining_bytes counter */
iRemain = 0; /* and indicate there's no input left */
}
else
{ /* calculate what does fit */
mng_uint32 iFits = pData->iJPEGbufmax - pData->iJPEGbufremain;
if (iFits <= 0) /* no space is just bugger 'm all */
MNG_ERROR (pData, MNG_JPEGBUFTOOSMALL);
/* move that */
MNG_COPY ((pData->pJPEGcurrent + pData->iJPEGbufremain), pWork, iFits);
pData->iJPEGbufremain += iFits; /* adjust remain_bytes counter */
iRemain -= iFits; /* and the input-parms */
pWork += iFits;
}
#ifdef MNG_INCLUDE_IJG6B
pData->pJPEGdinfo->src->next_input_byte = pData->pJPEGcurrent;
pData->pJPEGdinfo->src->bytes_in_buffer = pData->iJPEGbufremain;
if (!pData->bJPEGhasheader) /* haven't got the header yet ? */
{
/* call jpeg_read_header() to obtain image info */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_HEADER)
#endif
if (jpeg_read_header (pData->pJPEGdinfo, TRUE) != JPEG_SUSPENDED)
{ /* indicate the header's oke */
pData->bJPEGhasheader = MNG_TRUE;
/* let's do some sanity checks ! */
if ((pData->pJPEGdinfo->image_width != pData->iDatawidth ) ||
(pData->pJPEGdinfo->image_height != pData->iDataheight) )
MNG_ERROR (pData, MNG_JPEGPARMSERR);
if ( ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAY ) ||
(pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA) ) &&
(pData->pJPEGdinfo->jpeg_color_space != JCS_GRAYSCALE ) )
MNG_ERROR (pData, MNG_JPEGPARMSERR);
if ( ((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLOR ) ||
(pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA) ) &&
(pData->pJPEGdinfo->jpeg_color_space != JCS_YCbCr ) )
MNG_ERROR (pData, MNG_JPEGPARMSERR);
/* indicate whether or not it's progressive */
pData->bJPEGprogressive = (mng_bool)jpeg_has_multiple_scans (pData->pJPEGdinfo);
/* progressive+alpha can't display "on-the-fly"!! */
if ((pData->bJPEGprogressive) &&
((pData->iJHDRcolortype == MNG_COLORTYPE_JPEGGRAYA ) ||
(pData->iJHDRcolortype == MNG_COLORTYPE_JPEGCOLORA) ))
pData->fDisplayrow = MNG_NULL;
/* allocate a row of JPEG-samples */
if (pData->pJPEGdinfo->jpeg_color_space == JCS_YCbCr)
pData->iJPEGrowlen = pData->pJPEGdinfo->image_width * RGB_PIXELSIZE;
else
pData->iJPEGrowlen = pData->pJPEGdinfo->image_width;
MNG_ALLOC (pData, pData->pJPEGrow, pData->iJPEGrowlen);
pData->iJPEGrgbrow = 0; /* quite empty up to now */
}
pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
}
/* decompress not started ? */
if ((pData->bJPEGhasheader) && (!pData->bJPEGdecostarted))
{
/* set parameters for decompression */
if (pData->bJPEGprogressive) /* progressive display ? */
pData->pJPEGdinfo->buffered_image = TRUE;
/* jpeg_start_decompress(...); */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_DECOMPRESS)
#endif
if (jpeg_start_decompress (pData->pJPEGdinfo) == TRUE)
/* indicate it started */
pData->bJPEGdecostarted = MNG_TRUE;
pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
}
/* process some scanlines ? */
if ((pData->bJPEGhasheader) && (pData->bJPEGdecostarted) &&
((!jpeg_input_complete (pData->pJPEGdinfo)) ||
(pData->pJPEGdinfo->output_scanline < pData->pJPEGdinfo->output_height) ||
((pData->bJPEGprogressive) && (pData->bJPEGscanending))))
{
mng_int32 iLines = 0;
/* for (each output pass) */
do
{ /* address the row output buffer */
JSAMPROW pRow = (JSAMPROW)pData->pJPEGrow;
/* init new pass ? */
if ((pData->bJPEGprogressive) && (!pData->bJPEGscanstarted))
{
pData->bJPEGscanstarted = MNG_TRUE;
/* adjust output decompression parameters if required */
/* nop */
/* start a new output pass */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_OUTPUT)
#endif
jpeg_start_output (pData->pJPEGdinfo, pData->pJPEGdinfo->input_scan_number);
pData->iJPEGrow = 0; /* start at row 0 in the image again */
}
/* while (scan lines remain to be read) */
if ((!pData->bJPEGprogressive) || (!pData->bJPEGscanending))
{
do
{
/* jpeg_read_scanlines(...); */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_SCANLINES)
#endif
iLines = jpeg_read_scanlines (pData->pJPEGdinfo, (JSAMPARRAY)&pRow, 1);
pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
if (iLines > 0) /* got something ? */
{
if (pData->fStorerow2) /* store in object ? */
{
iRetcode = ((mng_storerow)pData->fStorerow2) (pData);
if (iRetcode) /* on error bail out */
return iRetcode;
}
}
}
while ((pData->pJPEGdinfo->output_scanline < pData->pJPEGdinfo->output_height) &&
(iLines > 0)); /* until end-of-image or not enough input-data */
}
/* terminate output pass */
if ((pData->bJPEGprogressive) &&
(pData->pJPEGdinfo->output_scanline >= pData->pJPEGdinfo->output_height))
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_OUTPUT)
#endif
if (jpeg_finish_output (pData->pJPEGdinfo) != JPEG_SUSPENDED)
{ /* this scan has ended */
pData->bJPEGscanstarted = MNG_FALSE;
pData->bJPEGscanending = MNG_FALSE;
}
else
{
pData->bJPEGscanending = MNG_TRUE;
}
}
}
while ((!jpeg_input_complete (pData->pJPEGdinfo)) &&
(iLines > 0) && (!pData->bJPEGscanending));
}
/* end of image ? */
if ((pData->bJPEGhasheader) && (pData->bJPEGdecostarted) &&
(!pData->bJPEGscanending) && (jpeg_input_complete (pData->pJPEGdinfo)) &&
(pData->pJPEGdinfo->input_scan_number == pData->pJPEGdinfo->output_scan_number))
{
/* jpeg_finish_decompress(...); */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_DECOMPRESS)
#endif
if (jpeg_finish_decompress (pData->pJPEGdinfo) == TRUE)
{ /* indicate it's done */
pData->bJPEGhasheader = MNG_FALSE;
pData->bJPEGdecostarted = MNG_FALSE;
pData->pJPEGcurrent = (mng_uint8p)pData->pJPEGdinfo->src->next_input_byte;
pData->iJPEGbufremain = (mng_uint32)pData->pJPEGdinfo->src->bytes_in_buffer;
/* remaining fluff is an error ! */
if ((pData->iJPEGbufremain > 0) || (iRemain > 0))
MNG_ERROR (pData, MNG_TOOMUCHJDAT);
}
}
#endif /* MNG_INCLUDE_IJG6B */
}
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_END);
#endif
return MNG_NOERROR;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
mng_retcode mngjpeg_decompressfree (mng_datap pData)
{
#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
mng_retcode iRetcode;
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_START);
#endif
#ifdef MNG_INCLUDE_IJG6B
#ifdef MNG_USE_SETJMP
iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif
/* free the row of JPEG-samples*/
MNG_FREE (pData, pData->pJPEGrow, pData->iJPEGrowlen);
/* release the JPEG decompression object */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_JPEG_DESTROY_DECOMPRESS)
#endif
jpeg_destroy_decompress (pData->pJPEGdinfo);
pData->bJPEGdecompress = MNG_FALSE; /* indicate it's done */
#endif /* MNG_INCLUDE_IJG6B */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_END);
#endif
return MNG_NOERROR;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
/* * * */
/* * JPEG decompression routines (JDAA) * */
/* * * */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
mng_retcode mngjpeg_decompressinit2 (mng_datap pData)
{
#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
mng_retcode iRetcode;
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_START);
#endif
#ifdef MNG_INCLUDE_IJG6B
/* allocate and initialize a JPEG decompression object */
pData->pJPEGdinfo2->err = jpeg_std_error (pData->pJPEGderr2);
#ifdef MNG_USE_SETJMP /* setup local JPEG error-routines */
pData->pJPEGderr2->error_exit = mng_error_exit;
pData->pJPEGderr2->output_message = mng_output_message;
iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif /* MNG_USE_SETJMP */
/* allocate and initialize a JPEG decompression object (continued) */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_JPEG_CREATE_DECOMPRESS)
#endif
jpeg_create_decompress (pData->pJPEGdinfo2);
pData->bJPEGdecompress2 = MNG_TRUE; /* indicate it's initialized */
/* specify the source of the compressed data (eg, a file) */
/* no, not a file; we have buffered input */
pData->pJPEGdinfo2->src = pData->pJPEGdsrc2;
/* use the default handler */
pData->pJPEGdinfo2->src->resync_to_restart = jpeg_resync_to_restart;
/* setup local source routine & parms */
pData->pJPEGdinfo2->src->init_source = mng_init_source;
pData->pJPEGdinfo2->src->fill_input_buffer = mng_fill_input_buffer;
pData->pJPEGdinfo2->src->skip_input_data = mng_skip_input_data2;
pData->pJPEGdinfo2->src->term_source = mng_term_source;
pData->pJPEGdinfo2->src->next_input_byte = pData->pJPEGcurrent2;
pData->pJPEGdinfo2->src->bytes_in_buffer = pData->iJPEGbufremain2;
#endif /* MNG_INCLUDE_IJG6B */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSINIT, MNG_LC_END);
#endif
return MNG_NOERROR;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
mng_retcode mngjpeg_decompressdata2 (mng_datap pData,
mng_uint32 iRawsize,
mng_uint8p pRawdata)
{
mng_retcode iRetcode;
mng_uint32 iRemain;
mng_uint8p pWork;
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_START);
#endif
#if defined (MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
iRetcode = setjmp (pData->sErrorbuf);/* initialize local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif
pWork = pRawdata;
iRemain = iRawsize;
if (pData->iJPEGtoskip2) /* JPEG-lib told us to skip some more data ? */
{
if (iRemain > pData->iJPEGtoskip2) /* enough data in this buffer ? */
{
iRemain -= pData->iJPEGtoskip2; /* skip enough to access the next byte */
pWork += pData->iJPEGtoskip2;
pData->iJPEGtoskip2 = 0; /* no more to skip then */
}
else
{
pData->iJPEGtoskip2 -= iRemain; /* skip all data in the buffer */
iRemain = 0; /* and indicate this accordingly */
}
/* the skip set current-pointer to NULL ! */
pData->pJPEGcurrent2 = pData->pJPEGbuf2;
}
while (iRemain) /* repeat until no more input-bytes */
{ /* need to shift anything ? */
if ((pData->pJPEGcurrent2 > pData->pJPEGbuf2) &&
(pData->pJPEGcurrent2 - pData->pJPEGbuf2 + pData->iJPEGbufremain2 + iRemain > pData->iJPEGbufmax2))
{
if (pData->iJPEGbufremain2 > 0) /* then do so */
MNG_COPY (pData->pJPEGbuf2, pData->pJPEGcurrent2, pData->iJPEGbufremain2);
pData->pJPEGcurrent2 = pData->pJPEGbuf2;
}
/* does the remaining input fit into the buffer ? */
if (pData->iJPEGbufremain2 + iRemain <= pData->iJPEGbufmax2)
{ /* move the lot */
MNG_COPY ((pData->pJPEGcurrent2 + pData->iJPEGbufremain2), pWork, iRemain);
/* adjust remaining_bytes counter */
pData->iJPEGbufremain2 += iRemain;
iRemain = 0; /* and indicate there's no input left */
}
else
{ /* calculate what does fit */
mng_uint32 iFits = pData->iJPEGbufmax2 - pData->iJPEGbufremain2;
if (iFits <= 0) /* no space is just bugger 'm all */
MNG_ERROR (pData, MNG_JPEGBUFTOOSMALL);
/* move that */
MNG_COPY ((pData->pJPEGcurrent2 + pData->iJPEGbufremain2), pWork, iFits);
pData->iJPEGbufremain2 += iFits; /* adjust remain_bytes counter */
iRemain -= iFits; /* and the input-parms */
pWork += iFits;
}
#ifdef MNG_INCLUDE_IJG6B
pData->pJPEGdinfo2->src->next_input_byte = pData->pJPEGcurrent2;
pData->pJPEGdinfo2->src->bytes_in_buffer = pData->iJPEGbufremain2;
if (!pData->bJPEGhasheader2) /* haven't got the header yet ? */
{
/* call jpeg_read_header() to obtain image info */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_HEADER)
#endif
if (jpeg_read_header (pData->pJPEGdinfo2, TRUE) != JPEG_SUSPENDED)
{ /* indicate the header's oke */
pData->bJPEGhasheader2 = MNG_TRUE;
/* let's do some sanity checks ! */
if ((pData->pJPEGdinfo2->image_width != pData->iDatawidth ) ||
(pData->pJPEGdinfo2->image_height != pData->iDataheight) )
MNG_ERROR (pData, MNG_JPEGPARMSERR);
if (pData->pJPEGdinfo2->jpeg_color_space != JCS_GRAYSCALE)
MNG_ERROR (pData, MNG_JPEGPARMSERR);
/* indicate whether or not it's progressive */
pData->bJPEGprogressive2 = (mng_bool)jpeg_has_multiple_scans (pData->pJPEGdinfo2);
if (pData->bJPEGprogressive2) /* progressive alphachannel not allowed !!! */
MNG_ERROR (pData, MNG_JPEGPARMSERR);
/* allocate a row of JPEG-samples */
if (pData->pJPEGdinfo2->jpeg_color_space == JCS_YCbCr)
pData->iJPEGrowlen2 = pData->pJPEGdinfo2->image_width * RGB_PIXELSIZE;
else
pData->iJPEGrowlen2 = pData->pJPEGdinfo2->image_width;
MNG_ALLOC (pData, pData->pJPEGrow2, pData->iJPEGrowlen2);
pData->iJPEGalpharow = 0; /* quite empty up to now */
}
pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
}
/* decompress not started ? */
if ((pData->bJPEGhasheader2) && (!pData->bJPEGdecostarted2))
{
/* set parameters for decompression */
if (pData->bJPEGprogressive2) /* progressive display ? */
pData->pJPEGdinfo2->buffered_image = TRUE;
/* jpeg_start_decompress(...); */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_DECOMPRESS)
#endif
if (jpeg_start_decompress (pData->pJPEGdinfo2) == TRUE)
/* indicate it started */
pData->bJPEGdecostarted2 = MNG_TRUE;
pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
}
/* process some scanlines ? */
if ((pData->bJPEGhasheader2) && (pData->bJPEGdecostarted2) &&
((!jpeg_input_complete (pData->pJPEGdinfo2)) ||
(pData->pJPEGdinfo2->output_scanline < pData->pJPEGdinfo2->output_height)))
{
mng_int32 iLines;
/* for (each output pass) */
do
{ /* address the row output buffer */
JSAMPROW pRow = (JSAMPROW)pData->pJPEGrow2;
/* init new pass ? */
if ((pData->bJPEGprogressive2) &&
((!pData->bJPEGscanstarted2) ||
(pData->pJPEGdinfo2->output_scanline >= pData->pJPEGdinfo2->output_height)))
{
pData->bJPEGscanstarted2 = MNG_TRUE;
/* adjust output decompression parameters if required */
/* nop */
/* start a new output pass */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_START_OUTPUT)
#endif
jpeg_start_output (pData->pJPEGdinfo2, pData->pJPEGdinfo2->input_scan_number);
pData->iJPEGrow = 0; /* start at row 0 in the image again */
}
/* while (scan lines remain to be read) */
do
{
/* jpeg_read_scanlines(...); */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_READ_SCANLINES)
#endif
iLines = jpeg_read_scanlines (pData->pJPEGdinfo2, (JSAMPARRAY)&pRow, 1);
pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
if (iLines > 0) /* got something ? */
{
if (pData->fStorerow3) /* store in object ? */
{
iRetcode = ((mng_storerow)pData->fStorerow3) (pData);
if (iRetcode) /* on error bail out */
return iRetcode;
}
}
}
while ((pData->pJPEGdinfo2->output_scanline < pData->pJPEGdinfo2->output_height) &&
(iLines > 0)); /* until end-of-image or not enough input-data */
/* terminate output pass */
if ((pData->bJPEGprogressive2) &&
(pData->pJPEGdinfo2->output_scanline >= pData->pJPEGdinfo2->output_height))
{
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_OUTPUT)
#endif
if (jpeg_finish_output (pData->pJPEGdinfo2) == JPEG_SUSPENDED)
jpeg_finish_output (pData->pJPEGdinfo2);
/* this scan has ended */
pData->bJPEGscanstarted2 = MNG_FALSE;
}
}
while ((!jpeg_input_complete (pData->pJPEGdinfo2)) && (iLines > 0));
}
/* end of image ? */
if ((pData->bJPEGhasheader2) && (pData->bJPEGdecostarted2) &&
(jpeg_input_complete (pData->pJPEGdinfo2)) &&
(pData->pJPEGdinfo2->input_scan_number == pData->pJPEGdinfo2->output_scan_number))
{
/* jpeg_finish_decompress(...); */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_JPEG_FINISH_DECOMPRESS)
#endif
if (jpeg_finish_decompress (pData->pJPEGdinfo2) == TRUE)
{ /* indicate it's done */
pData->bJPEGhasheader2 = MNG_FALSE;
pData->bJPEGdecostarted2 = MNG_FALSE;
pData->pJPEGcurrent2 = (mng_uint8p)pData->pJPEGdinfo2->src->next_input_byte;
pData->iJPEGbufremain2 = (mng_uint32)pData->pJPEGdinfo2->src->bytes_in_buffer;
/* remaining fluff is an error ! */
if ((pData->iJPEGbufremain2 > 0) || (iRemain > 0))
MNG_ERROR (pData, MNG_TOOMUCHJDAT);
}
}
#endif /* MNG_INCLUDE_IJG6B */
}
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSDATA, MNG_LC_END);
#endif
return MNG_NOERROR;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#ifdef MNG_INCLUDE_JNG_READ
mng_retcode mngjpeg_decompressfree2 (mng_datap pData)
{
#if defined(MNG_INCLUDE_IJG6B) && defined(MNG_USE_SETJMP)
mng_retcode iRetcode;
#endif
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_START);
#endif
#ifdef MNG_INCLUDE_IJG6B
#ifdef MNG_USE_SETJMP
iRetcode = setjmp (pData->sErrorbuf);/* setup local JPEG error-recovery */
if (iRetcode != 0) /* got here from longjmp ? */
MNG_ERRORJ (pData, iRetcode); /* then IJG-lib issued an error */
#endif
/* free the row of JPEG-samples*/
MNG_FREE (pData, pData->pJPEGrow2, pData->iJPEGrowlen2);
/* release the JPEG decompression object */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_JPEG_DESTROY_DECOMPRESS)
#endif
jpeg_destroy_decompress (pData->pJPEGdinfo2);
pData->bJPEGdecompress2 = MNG_FALSE; /* indicate it's done */
#endif /* MNG_INCLUDE_IJG6B */
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_JPEG_DECOMPRESSFREE, MNG_LC_END);
#endif
return MNG_NOERROR;
}
#endif /* MNG_INCLUDE_JNG_READ */
/* ************************************************************************** */
#endif /* MNG_INCLUDE_JNG && MNG_INCLUDE_DISPLAY_PROCS */
/* ************************************************************************** */
/* * end of file * */
/* ************************************************************************** */
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