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Upgraded JPEGDecodeRaw() to support JPEG_LIB_MK1.

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This commit is contained in:
Frank Warmerdam 2005-05-06 14:18:15 +00:00
parent 3b8d6df405
commit 9808f201f2
1 changed files with 106 additions and 63 deletions
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169
libtiff/tif_jpeg.c
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@ -1,4 +1,4 @@
/* $Id: tif_jpeg.c,v 1.31 2005-03-22 18:55:55 fwarmerdam Exp $ */
/* $Id: tif_jpeg.c,v 1.32 2005-05-06 14:18:15 fwarmerdam Exp $ */
/*
* Copyright (c) 1994-1997 Sam Leffler
@ -869,8 +869,6 @@ JPEGDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
** pack down to 12bit or 8bit. In 6B case we only read into 16
** bit buffer for 12bit data, which we need to repack.
*/
JSAMPROW bufptr = line_work_buf;
if (TIFFjpeg_read_scanlines(sp, &line_work_buf, 1) != 1)
return (0);
@ -938,73 +936,118 @@ JPEGDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
/*ARGSUSED*/ static int
JPEGDecodeRaw(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
{
JPEGState *sp = JState(tif);
tsize_t nrows;
JPEGState *sp = JState(tif);
tsize_t nrows;
/* data is expected to be read in multiples of a scanline */
if ( (nrows = sp->cinfo.d.image_height) ) {
/* Cb,Cr both have sampling factors 1, so this is correct */
JDIMENSION clumps_per_line = sp->cinfo.d.comp_info[1].downsampled_width;
int samples_per_clump = sp->samplesperclump;
/* data is expected to be read in multiples of a scanline */
if ( (nrows = sp->cinfo.d.image_height) ) {
/* Cb,Cr both have sampling factors 1, so this is correct */
JDIMENSION clumps_per_line = sp->cinfo.d.comp_info[1].downsampled_width;
int samples_per_clump = sp->samplesperclump;
do {
jpeg_component_info *compptr;
int ci, clumpoffset;
#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;
/* Reload downsampled-data buffer if needed */
if (sp->scancount >= DCTSIZE) {
int n = sp->cinfo.d.max_v_samp_factor * DCTSIZE;
if (TIFFjpeg_read_raw_data(sp, sp->ds_buffer, n)
!= n)
return (0);
sp->scancount = 0;
}
/*
* Fastest way to unseparate data is to make one pass
* over the scanline for each row of each component.
*/
clumpoffset = 0; /* first sample in clump */
for (ci = 0, compptr = sp->cinfo.d.comp_info;
ci < sp->cinfo.d.num_components;
ci++, compptr++) {
int hsamp = compptr->h_samp_factor;
int vsamp = compptr->v_samp_factor;
int ypos;
for (ypos = 0; ypos < vsamp; ypos++) {
JSAMPLE *inptr = sp->ds_buffer[ci][sp->scancount*vsamp + ypos];
JSAMPLE *outptr = (JSAMPLE*)buf + clumpoffset;
JDIMENSION nclump;
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;
if (hsamp == 1) {
/* fast path for at least Cb and Cr */
for (nclump = clumps_per_line; nclump-- > 0; ) {
outptr[0] = *inptr++;
outptr += samples_per_clump;
}
} else {
int xpos;
/* general case */
for (nclump = clumps_per_line; nclump-- > 0; ) {
for (xpos = 0; xpos < hsamp; xpos++)
outptr[xpos] = *inptr++;
outptr += samples_per_clump;
}
}
clumpoffset += hsamp;
}
}
++sp->scancount;
++tif->tif_row;
buf += sp->bytesperline;
cc -= sp->bytesperline;
} while (--nrows > 0);
}
/* general case */
for (nclump = clumps_per_line; nclump-- > 0; ) {
for (xpos = 0; xpos < hsamp; xpos++)
outptr[xpos] = *inptr++;
outptr += samples_per_clump;
}
}
clumpoffset += hsamp;
}
}
/* Close down the decompressor if done. */
return sp->cinfo.d.output_scanline < sp->cinfo.d.output_height
|| TIFFjpeg_finish_decompress(sp);
#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;
buf += sp->bytesperline;
cc -= sp->bytesperline;
} while (--nrows > 0);
#ifdef JPEG_LIB_MK1
_TIFFfree(tmpbuf);
#endif
}
/* Close down the decompressor if done. */
return sp->cinfo.d.output_scanline < sp->cinfo.d.output_height
|| TIFFjpeg_finish_decompress(sp);
}