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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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DRC
2012-01-27 09:52:20 +00:00
parent 44e6c174ee
commit 311728cd98
2 changed files with 24 additions and 21 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

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