The Independent JPEG Group's JPEG software
==========================================
-README for release 8 of 10-Jan-2010
-===================================
+README for release 8a of 28-Feb-2010
+====================================
This distribution contains the eighth public release of the Independent JPEG
Group's free JPEG software. You are welcome to redistribute this software and
The "official" archive site for this software is www.ijg.org.
The most recent released version can always be found there in
directory "files". This particular version will be archived as
-http://www.ijg.org/files/jpegsrc.v8.tar.gz, and in Windows-compatible
-"zip" archive format as http://www.ijg.org/files/jpegsr8.zip.
+http://www.ijg.org/files/jpegsrc.v8a.tar.gz, and in Windows-compatible
+"zip" archive format as http://www.ijg.org/files/jpegsr8a.zip.
The JPEG FAQ (Frequently Asked Questions) article is a source of some
general information about JPEG.
TO DO
=====
-Version 8.0 is the first release of a new generation JPEG standard
+Version 8 is the first release of a new generation JPEG standard
to overcome the limitations of the original JPEG specification.
More features are being prepared for coming releases...
CHANGE LOG for Independent JPEG Group's JPEG software
+Version 8a 28-Feb-2010
+-----------------------
+
+Writing tables-only datastreams via jpeg_write_tables works again.
+
+Support 32-bit BMPs (RGB image with Alpha channel) for read in cjpeg.
+Thank to Brett Blackham for the suggestion.
+
+Improve accuracy in floating point IDCT calculation.
+Thank to Robert Hooke for the hint.
+
+
Version 8 10-Jan-2010
----------------------
#! /bin/sh
# Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.65 for libjpeg 8.0.
+# Generated by GNU Autoconf 2.65 for libjpeg 8.0.1.
#
#
# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
# Identity of this package.
PACKAGE_NAME='libjpeg'
PACKAGE_TARNAME='libjpeg'
-PACKAGE_VERSION='8.0'
-PACKAGE_STRING='libjpeg 8.0'
+PACKAGE_VERSION='8.0.1'
+PACKAGE_STRING='libjpeg 8.0.1'
PACKAGE_BUGREPORT=''
PACKAGE_URL=''
# Omit some internal or obsolete options to make the list less imposing.
# This message is too long to be a string in the A/UX 3.1 sh.
cat <<_ACEOF
-\`configure' configures libjpeg 8.0 to adapt to many kinds of systems.
+\`configure' configures libjpeg 8.0.1 to adapt to many kinds of systems.
Usage: $0 [OPTION]... [VAR=VALUE]...
if test -n "$ac_init_help"; then
case $ac_init_help in
- short | recursive ) echo "Configuration of libjpeg 8.0:";;
+ short | recursive ) echo "Configuration of libjpeg 8.0.1:";;
esac
cat <<\_ACEOF
test -n "$ac_init_help" && exit $ac_status
if $ac_init_version; then
cat <<\_ACEOF
-libjpeg configure 8.0
+libjpeg configure 8.0.1
generated by GNU Autoconf 2.65
Copyright (C) 2009 Free Software Foundation, Inc.
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.
-It was created by libjpeg $as_me 8.0, which was
+It was created by libjpeg $as_me 8.0.1, which was
generated by GNU Autoconf 2.65. Invocation command line was
$ $0 $@
# Define the identity of the package.
PACKAGE='libjpeg'
- VERSION='8.0'
+ VERSION='8.0.1'
cat >>confdefs.h <<_ACEOF
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking libjpeg version number" >&5
$as_echo_n "checking libjpeg version number... " >&6; }
JPEG_LIB_VERSION=`sed -e '/^#define JPEG_LIB_VERSION/!d' -e 's/^[^0-9]*\([0-9][0-9]*\).*$/\1/' $srcdir/jpeglib.h`
-JPEG_LIB_VERSION="`expr $JPEG_LIB_VERSION / 10`:`expr $JPEG_LIB_VERSION % 10`"
+JPEG_LIB_VERSION="`expr $JPEG_LIB_VERSION / 10`:1"
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $JPEG_LIB_VERSION" >&5
$as_echo "$JPEG_LIB_VERSION" >&6; }
# report actual input values of CONFIG_FILES etc. instead of their
# values after options handling.
ac_log="
-This file was extended by libjpeg $as_me 8.0, which was
+This file was extended by libjpeg $as_me 8.0.1, which was
generated by GNU Autoconf 2.65. Invocation command line was
CONFIG_FILES = $CONFIG_FILES
cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
ac_cs_version="\\
-libjpeg config.status 8.0
+libjpeg config.status 8.0.1
configured by $0, generated by GNU Autoconf 2.65,
with options \\"\$ac_cs_config\\"
# Configure script for IJG libjpeg
#
-AC_INIT([libjpeg], [8.0])
+AC_INIT([libjpeg], [8.0.1])
# Directory where autotools helper scripts lives.
AC_CONFIG_AUX_DIR([.])
# Extract the library version ID from jpeglib.h.
AC_MSG_CHECKING([libjpeg version number])
[JPEG_LIB_VERSION=`sed -e '/^#define JPEG_LIB_VERSION/!d' -e 's/^[^0-9]*\([0-9][0-9]*\).*$/\1/' $srcdir/jpeglib.h`]
-[JPEG_LIB_VERSION="`expr $JPEG_LIB_VERSION / 10`:`expr $JPEG_LIB_VERSION % 10`"]
+[JPEG_LIB_VERSION="`expr $JPEG_LIB_VERSION / 10`:1"]
AC_MSG_RESULT([$JPEG_LIB_VERSION])
AC_SUBST([JPEG_LIB_VERSION])
* jcapimin.c
*
* Copyright (C) 1994-1998, Thomas G. Lane.
+ * Modified 2003-2010 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
cinfo->ac_huff_tbl_ptrs[i] = NULL;
}
+ /* Must do it here for emit_dqt in case jpeg_write_tables is used */
+ cinfo->block_size = DCTSIZE;
+ cinfo->natural_order = jpeg_natural_order;
+ cinfo->lim_Se = DCTSIZE2-1;
+
cinfo->script_space = NULL;
cinfo->input_gamma = 1.0; /* in case application forgets */
cinfo->min_DCT_v_scaled_size = DCTSIZE;
#endif /* DCT_SCALING_SUPPORTED */
-
- cinfo->block_size = DCTSIZE;
- cinfo->natural_order = jpeg_natural_order;
- cinfo->lim_Se = DCTSIZE2-1;
}
* jddctmgr.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
+ * Modified 2002-2010 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* coefficients scaled by scalefactor[row]*scalefactor[col], where
* scalefactor[0] = 1
* scalefactor[k] = cos(k*PI/16) * sqrt(2) for k=1..7
+ * We apply a further scale factor of 1/8.
*/
FLOAT_MULT_TYPE * fmtbl = (FLOAT_MULT_TYPE *) compptr->dct_table;
int row, col;
for (col = 0; col < DCTSIZE; col++) {
fmtbl[i] = (FLOAT_MULT_TYPE)
((double) qtbl->quantval[i] *
- aanscalefactor[row] * aanscalefactor[col]);
+ aanscalefactor[row] * aanscalefactor[col] * 0.125);
i++;
}
}
* jidctflt.c
*
* Copyright (C) 1994-1998, Thomas G. Lane.
+ * Modified 2010 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
FLOAT_MULT_TYPE * quantptr;
FAST_FLOAT * wsptr;
JSAMPROW outptr;
- JSAMPLE *range_limit = IDCT_range_limit(cinfo);
+ JSAMPLE *range_limit = cinfo->sample_range_limit;
int ctr;
FAST_FLOAT workspace[DCTSIZE2]; /* buffers data between passes */
- SHIFT_TEMPS
/* Pass 1: process columns from input, store into work array. */
tmp11 = (z11 - z13) * ((FAST_FLOAT) 1.414213562); /* 2*c4 */
z5 = (z10 + z12) * ((FAST_FLOAT) 1.847759065); /* 2*c2 */
- tmp10 = ((FAST_FLOAT) 1.082392200) * z12 - z5; /* 2*(c2-c6) */
- tmp12 = ((FAST_FLOAT) -2.613125930) * z10 + z5; /* -2*(c2+c6) */
+ tmp10 = z5 - z12 * ((FAST_FLOAT) 1.082392200); /* 2*(c2-c6) */
+ tmp12 = z5 - z10 * ((FAST_FLOAT) 2.613125930); /* 2*(c2+c6) */
tmp6 = tmp12 - tmp7; /* phase 2 */
tmp5 = tmp11 - tmp6;
- tmp4 = tmp10 + tmp5;
+ tmp4 = tmp10 - tmp5;
wsptr[DCTSIZE*0] = tmp0 + tmp7;
wsptr[DCTSIZE*7] = tmp0 - tmp7;
wsptr[DCTSIZE*6] = tmp1 - tmp6;
wsptr[DCTSIZE*2] = tmp2 + tmp5;
wsptr[DCTSIZE*5] = tmp2 - tmp5;
- wsptr[DCTSIZE*4] = tmp3 + tmp4;
- wsptr[DCTSIZE*3] = tmp3 - tmp4;
+ wsptr[DCTSIZE*3] = tmp3 + tmp4;
+ wsptr[DCTSIZE*4] = tmp3 - tmp4;
inptr++; /* advance pointers to next column */
quantptr++;
}
/* Pass 2: process rows from work array, store into output array. */
- /* Note that we must descale the results by a factor of 8 == 2**3. */
wsptr = workspace;
for (ctr = 0; ctr < DCTSIZE; ctr++) {
/* Even part */
- tmp10 = wsptr[0] + wsptr[4];
- tmp11 = wsptr[0] - wsptr[4];
+ /* Apply signed->unsigned and prepare float->int conversion */
+ z5 = wsptr[0] + ((FAST_FLOAT) CENTERJSAMPLE + (FAST_FLOAT) 0.5);
+ tmp10 = z5 + wsptr[4];
+ tmp11 = z5 - wsptr[4];
tmp13 = wsptr[2] + wsptr[6];
tmp12 = (wsptr[2] - wsptr[6]) * ((FAST_FLOAT) 1.414213562) - tmp13;
tmp11 = (z11 - z13) * ((FAST_FLOAT) 1.414213562);
z5 = (z10 + z12) * ((FAST_FLOAT) 1.847759065); /* 2*c2 */
- tmp10 = ((FAST_FLOAT) 1.082392200) * z12 - z5; /* 2*(c2-c6) */
- tmp12 = ((FAST_FLOAT) -2.613125930) * z10 + z5; /* -2*(c2+c6) */
+ tmp10 = z5 - z12 * ((FAST_FLOAT) 1.082392200); /* 2*(c2-c6) */
+ tmp12 = z5 - z10 * ((FAST_FLOAT) 2.613125930); /* 2*(c2+c6) */
tmp6 = tmp12 - tmp7;
tmp5 = tmp11 - tmp6;
- tmp4 = tmp10 + tmp5;
-
- /* Final output stage: scale down by a factor of 8 and range-limit */
-
- outptr[0] = range_limit[(int) DESCALE((INT32) (tmp0 + tmp7), 3)
- & RANGE_MASK];
- outptr[7] = range_limit[(int) DESCALE((INT32) (tmp0 - tmp7), 3)
- & RANGE_MASK];
- outptr[1] = range_limit[(int) DESCALE((INT32) (tmp1 + tmp6), 3)
- & RANGE_MASK];
- outptr[6] = range_limit[(int) DESCALE((INT32) (tmp1 - tmp6), 3)
- & RANGE_MASK];
- outptr[2] = range_limit[(int) DESCALE((INT32) (tmp2 + tmp5), 3)
- & RANGE_MASK];
- outptr[5] = range_limit[(int) DESCALE((INT32) (tmp2 - tmp5), 3)
- & RANGE_MASK];
- outptr[4] = range_limit[(int) DESCALE((INT32) (tmp3 + tmp4), 3)
- & RANGE_MASK];
- outptr[3] = range_limit[(int) DESCALE((INT32) (tmp3 - tmp4), 3)
- & RANGE_MASK];
+ tmp4 = tmp10 - tmp5;
+
+ /* Final output stage: float->int conversion and range-limit */
+
+ outptr[0] = range_limit[((int) (tmp0 + tmp7)) & RANGE_MASK];
+ outptr[7] = range_limit[((int) (tmp0 - tmp7)) & RANGE_MASK];
+ outptr[1] = range_limit[((int) (tmp1 + tmp6)) & RANGE_MASK];
+ outptr[6] = range_limit[((int) (tmp1 - tmp6)) & RANGE_MASK];
+ outptr[2] = range_limit[((int) (tmp2 + tmp5)) & RANGE_MASK];
+ outptr[5] = range_limit[((int) (tmp2 - tmp5)) & RANGE_MASK];
+ outptr[3] = range_limit[((int) (tmp3 + tmp4)) & RANGE_MASK];
+ outptr[4] = range_limit[((int) (tmp3 - tmp4)) & RANGE_MASK];
wsptr += DCTSIZE; /* advance pointer to next row */
}
/*
* jpegtran.c
*
- * Copyright (C) 1995-2009, Thomas G. Lane, Guido Vollbeding.
+ * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
#ifdef C_PROGRESSIVE_SUPPORTED
fprintf(stderr, " -progressive Create progressive JPEG file\n");
#endif
-#if TRANSFORMS_SUPPORTED
fprintf(stderr, "Switches for modifying the image:\n");
+#if TRANSFORMS_SUPPORTED
fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n");
fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n");
fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n");
fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n");
fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n");
+#endif
fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
+#if TRANSFORMS_SUPPORTED
fprintf(stderr, " -transpose Transpose image\n");
fprintf(stderr, " -transverse Transverse transpose image\n");
fprintf(stderr, " -trim Drop non-transformable edge blocks\n");
-#endif /* TRANSFORMS_SUPPORTED */
+#endif
fprintf(stderr, "Switches for advanced users:\n");
fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
*/
-#define JVERSION "8 10-Jan-2010"
+#define JVERSION "8a 28-Feb-2010"
#define JCOPYRIGHT "Copyright (C) 2010, Thomas G. Lane, Guido Vollbeding"
* rdbmp.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
- * Modified 2009 by Guido Vollbeding.
+ * Modified 2009-2010 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
}
+METHODDEF(JDIMENSION)
+get_32bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+/* This version is for reading 32-bit pixels */
+{
+ bmp_source_ptr source = (bmp_source_ptr) sinfo;
+ JSAMPARRAY image_ptr;
+ register JSAMPROW inptr, outptr;
+ register JDIMENSION col;
+
+ /* Fetch next row from virtual array */
+ source->source_row--;
+ image_ptr = (*cinfo->mem->access_virt_sarray)
+ ((j_common_ptr) cinfo, source->whole_image,
+ source->source_row, (JDIMENSION) 1, FALSE);
+ /* Transfer data. Note source values are in BGR order
+ * (even though Microsoft's own documents say the opposite).
+ */
+ inptr = image_ptr[0];
+ outptr = source->pub.buffer[0];
+ for (col = cinfo->image_width; col > 0; col--) {
+ outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */
+ outptr[1] = *inptr++;
+ outptr[0] = *inptr++;
+ inptr++; /* skip the 4th byte (Alpha channel) */
+ outptr += 3;
+ }
+
+ return 1;
+}
+
+
/*
* This method loads the image into whole_image during the first call on
* get_pixel_rows. The get_pixel_rows pointer is then adjusted to call
- * get_8bit_row or get_24bit_row on subsequent calls.
+ * get_8bit_row, get_24bit_row, or get_32bit_row on subsequent calls.
*/
METHODDEF(JDIMENSION)
case 24:
source->pub.get_pixel_rows = get_24bit_row;
break;
+ case 32:
+ source->pub.get_pixel_rows = get_32bit_row;
+ break;
default:
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
}
case 24: /* RGB image */
TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight);
break;
+ case 32: /* RGB image + Alpha channel */
+ TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight);
+ break;
default:
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
break;
/* Compute row width in file, including padding to 4-byte boundary */
if (source->bits_per_pixel == 24)
row_width = (JDIMENSION) (biWidth * 3);
+ else if (source->bits_per_pixel == 32)
+ row_width = (JDIMENSION) (biWidth * 4);
else
row_width = (JDIMENSION) biWidth;
while ((row_width & 3) != 0) row_width++;
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