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Be clear that we are only emulating the libjpeg v7/v8 API/ABI, not the library itself.

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@748 632fc199-4ca6-4c93-a231-07263d6284db
This commit is contained in:
DRC
2012-01-27 09:52:20 +00:00
parent 12781cb555 30913542c0
commit ed5430ce9a
7 changed files with 44 additions and 41 deletions
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24
BUILDING.txt
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@@ -107,14 +107,14 @@ This will generate the following files under .libs/
62, 7, or 8.
libjpeg v7 or v8 Emulation
--------------------------
libjpeg v7 or v8 API/ABI Emulation
----------------------------------
Add --with-jpeg7 to the configure command line to build a version of
libjpeg-turbo that is compatible with libjpeg v7. Add --with-jpeg8 to the
configure command to build a version of libjpeg-turbo that is compatible with
libjpeg v8. See README-turbo.txt for more information on libjpeg v7 and v8
emulation.
libjpeg-turbo that is API/ABI-compatible with libjpeg v7. Add --with-jpeg8 to
the configure command to build a version of libjpeg-turbo that is
API/ABI-compatible with libjpeg v8. See README-turbo.txt for more information
on libjpeg v7 and v8 emulation.
Arithmetic Coding Support
@@ -492,14 +492,14 @@ NMake, remove "-DCMAKE_BUILD_TYPE=Release" (Debug builds are the default with
NMake.)
libjpeg v7 or v8 Emulation
--------------------------
libjpeg v7 or v8 API/ABI Emulation
-----------------------------------
Add "-DWITH_JPEG7=1" to the cmake command line to build a version of
libjpeg-turbo that is compatible with libjpeg v7. Add "-DWITH_JPEG8=1" to the
cmake command to build a version of libjpeg-turbo that is compatible with
libjpeg v8. See README-turbo.txt for more information on libjpeg v7 and v8
emulation.
libjpeg-turbo that is API/ABI-compatible with libjpeg v7. Add "-DWITH_JPEG8=1"
to the cmake command to build a version of libjpeg-turbo that is
API/ABI-compatible with libjpeg v8. See README-turbo.txt for more information
on libjpeg v7 and v8 emulation.
Arithmetic Coding Support

4
README
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@@ -1,4 +1,4 @@
libjpeg-turbo note: This file is mostly taken from the libjpeg v8b README
libjpeg-turbo note: This file is mostly taken from the libjpeg README
file, and it is included only for reference. Some parts of it may not apply to
libjpeg-turbo. Please see README-turbo.txt for information specific to the
turbo version.
@@ -286,4 +286,4 @@ image files indefinitely.)
TO DO
=====
Please send bug reports, offers of help, etc. to jpeg-info@uc.ag.
Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.

14
cjpeg.1
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@@ -1,4 +1,4 @@
.TH CJPEG 1 "11 October 2010"
.TH CJPEG 1 "27 January 2012"
.SH NAME
cjpeg \- compress an image file to a JPEG file
.SH SYNOPSIS
@@ -150,6 +150,12 @@ about the same --- often a little smaller.
.PP
Switches for advanced users:
.TP
.B \-arithmetic
Use arithmetic coding.
.B Caution:
arithmetic coded JPEG is not yet widely implemented, so many decoders will be
unable to view an arithmetic coded JPEG file at all.
.TP
.B \-dct int
Use integer DCT method (default).
.TP
@@ -214,12 +220,6 @@ visibly blur the image, however.
.PP
Switches for wizards:
.TP
.B \-arithmetic
Use arithmetic coding.
.B Caution:
arithmetic coded JPEG is not yet widely implemented, so many decoders will be
unable to view an arithmetic coded JPEG file at all.
.TP
.B \-baseline
Force baseline-compatible quantization tables to be generated. This clamps
quantization values to 8 bits even at low quality settings. (This switch is

6
cjpeg.c
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@@ -164,6 +164,9 @@ usage (void)
fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
#endif
fprintf(stderr, "Switches for advanced users:\n");
#ifdef C_ARITH_CODING_SUPPORTED
fprintf(stderr, " -arithmetic Use arithmetic coding\n");
#endif
#ifdef DCT_ISLOW_SUPPORTED
fprintf(stderr, " -dct int Use integer DCT method%s\n",
(JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
@@ -184,9 +187,6 @@ usage (void)
fprintf(stderr, " -outfile name Specify name for output file\n");
fprintf(stderr, " -verbose or -debug Emit debug output\n");
fprintf(stderr, "Switches for wizards:\n");
#ifdef C_ARITH_CODING_SUPPORTED
fprintf(stderr, " -arithmetic Use arithmetic coding\n");
#endif
fprintf(stderr, " -baseline Force baseline quantization tables\n");
fprintf(stderr, " -qtables file Use quantization tables given in file\n");
fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");

10
install.txt
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@@ -534,17 +534,17 @@ In general, it's worth trying the maximum optimization level of your compiler,
and experimenting with any optional optimizations such as loop unrolling.
(Unfortunately, far too many compilers have optimizer bugs ... be prepared to
back off if the code fails self-test.) If you do any experimentation along
these lines, please report the optimal settings to jpeg-info@uc.ag so we
can mention them in future releases. Be sure to specify your machine
and compiler version.
these lines, please report the optimal settings to jpeg-info@jpegclub.org so
we can mention them in future releases. Be sure to specify your machine and
compiler version.
HINTS FOR SPECIFIC SYSTEMS
==========================
We welcome reports on changes needed for systems not mentioned here. Submit
'em to jpeg-info@uc.ag. Also, if configure or ckconfig.c is wrong about how
to configure the JPEG software for your system, please let us know.
'em to jpeg-info@jpegclub.org. Also, if configure or ckconfig.c is wrong
about how to configure the JPEG software for your system, please let us know.
Acorn RISC OS:

6
jpegtran.c
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@@ -78,14 +78,14 @@ usage (void)
fprintf(stderr, " -trim Drop non-transformable edge blocks\n");
#endif
fprintf(stderr, "Switches for advanced users:\n");
#ifdef C_ARITH_CODING_SUPPORTED
fprintf(stderr, " -arithmetic Use arithmetic coding\n");
#endif
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");
fprintf(stderr, " -outfile name Specify name for output file\n");
fprintf(stderr, " -verbose or -debug Emit debug output\n");
fprintf(stderr, "Switches for wizards:\n");
#ifdef C_ARITH_CODING_SUPPORTED
fprintf(stderr, " -arithmetic Use arithmetic coding\n");
#endif
#ifdef C_MULTISCAN_FILES_SUPPORTED
fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
#endif

21
libjpeg.txt
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@@ -850,8 +850,9 @@ int jpeg_quality_scaling (int quality)
premise of this routine collapses. Caveat user.
jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
[libjpeg v7/v8 only] Set default quantization tables with linear
q_scale_factor[] values (see below).
[libjpeg v7+ API/ABI emulation only]
Set default quantization tables with linear q_scale_factor[] values
(see below).
jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
const unsigned int *basic_table,
@@ -976,8 +977,9 @@ JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]
slot 1 for chrominance.
int q_scale_factor[NUM_QUANT_TBLS]
[libjpeg v7+ only] Linear quantization scaling factors (0-100, default
100) for use with jpeg_default_qtables().
[libjpeg v7+ API/ABI emulation only]
Linear quantization scaling factors (0-100, default 100)
for use with jpeg_default_qtables().
See rdswitch.c and cjpeg.c for an example of usage.
Note that the q_scale_factor[] values use "linear" scales, so JPEG
quality levels chosen by the user must be converted to these scales
@@ -1012,11 +1014,12 @@ JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]
any need to mess with providing your own Huffman tables.
[libjpeg v7+ only] The actual dimensions of the JPEG image that will be written
to the file are given by the following fields. These are computed from the
input image dimensions and the compression parameters by jpeg_start_compress().
You can also call jpeg_calc_jpeg_dimensions() to obtain the values that will
result from the current parameter settings.
[libjpeg v7+ API/ABI emulation only]
The actual dimensions of the JPEG image that will be written to the file are
given by the following fields. These are computed from the input image
dimensions and the compression parameters by jpeg_start_compress(). You can
also call jpeg_calc_jpeg_dimensions() to obtain the values that will result
from the current parameter settings.
JDIMENSION jpeg_width Actual dimensions of output image.
JDIMENSION jpeg_height