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-rw-r--r--ANNOUNCE21
-rw-r--r--CHANGES5
-rw-r--r--LICENSE4
-rw-r--r--README2
-rw-r--r--contrib/gregbook/readpng.c4
-rw-r--r--contrib/gregbook/readpng2.c4
-rw-r--r--contrib/pngminim/decoder/pngusr.dfa2
-rw-r--r--contrib/pngminim/preader/pngusr.dfa2
-rw-r--r--contrib/visupng/PngFile.c4
-rw-r--r--libpng-manual.txt39
-rw-r--r--libpng.351
-rw-r--r--libpngpf.32
-rw-r--r--png.52
-rw-r--r--pngconf.h2
-rw-r--r--projects/vstudio/readme.txt2
-rw-r--r--projects/vstudio/zlib.props2
-rw-r--r--scripts/README.txt2
-rw-r--r--scripts/pnglibconf.dfa3
-rw-r--r--scripts/pnglibconf.h.prebuilt3
19 files changed, 83 insertions, 73 deletions
diff --git a/ANNOUNCE b/ANNOUNCE
index 3d4466501..b5ccabb76 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
-Libpng 1.5.4beta04 - June 16, 2011
+Libpng 1.5.4beta05 - June 18, 2011
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@@ -9,20 +9,20 @@ Files available for download:
Source files with LF line endings (for Unix/Linux) and with a
"configure" script
- 1.5.4beta04.tar.xz (LZMA-compressed, recommended)
- 1.5.4beta04.tar.gz
- 1.5.4beta04.tar.bz2
+ 1.5.4beta05.tar.xz (LZMA-compressed, recommended)
+ 1.5.4beta05.tar.gz
+ 1.5.4beta05.tar.bz2
Source files with CRLF line endings (for Windows), without the
"configure" script
- lp154b04.7z (LZMA-compressed, recommended)
- lp154b04.zip
+ lp154b05.7z (LZMA-compressed, recommended)
+ lp154b05.zip
Other information:
- 1.5.4beta04-README.txt
- 1.5.4beta04-LICENSE.txt
+ 1.5.4beta05-README.txt
+ 1.5.4beta05-LICENSE.txt
Changes since the last public release (1.5.2):
@@ -220,6 +220,11 @@ Version 1.5.4beta04 [June 16, 2011]
not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
+Version 1.5.4beta05 [June 18, 2011]
+ Renamed png_set_strip_16() to png_set_scale_16() and renamed
+ png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
+ behavior changes between libpng14 and libpng15.
+
Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CHANGES b/CHANGES
index 5771845be..87178a26c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3483,6 +3483,11 @@ Version 1.5.4beta04 [June 16, 2011]
not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
+Version 1.5.4beta05 [June 18, 2011]
+ Renamed png_set_strip_16() to png_set_scale_16() and renamed
+ png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
+ behavior changes between libpng14 and libpng15.
+
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/LICENSE b/LICENSE
index 193226a9d..6c8d4a95f 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@ this sentence.
This code is released under the libpng license.
-libpng versions 1.2.6, August 15, 2004, through 1.5.4beta05, June 16, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.4beta05, June 18, 2011, are
Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
-June 16, 2011
+June 18, 2011
diff --git a/README b/README
index 6a349d9e1..3e57eb213 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.5.4beta05 - June 16, 2011 (shared library 15.0)
+README for libpng version 1.5.4beta05 - June 18, 2011 (shared library 15.0)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
diff --git a/contrib/gregbook/readpng.c b/contrib/gregbook/readpng.c
index 208a883c5..df42c301b 100644
--- a/contrib/gregbook/readpng.c
+++ b/contrib/gregbook/readpng.c
@@ -231,8 +231,8 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
png_set_expand(png_ptr);
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (bit_depth == 16)
-# ifdef PNG_READ_CHOP_16_TO_8_SUPPORTED
- png_set_chop_16(png_ptr);
+# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+ png_set_scale_16(png_ptr);
# else
png_set_strip_16(png_ptr);
# endif
diff --git a/contrib/gregbook/readpng2.c b/contrib/gregbook/readpng2.c
index 785772dea..b9746b756 100644
--- a/contrib/gregbook/readpng2.c
+++ b/contrib/gregbook/readpng2.c
@@ -313,8 +313,8 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
png_set_expand(png_ptr);
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (bit_depth == 16)
-# ifdef PNG_READ_CHOP_16_TO_8_SUPPORTED
- png_set_chop_16(png_ptr);
+# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+ png_set_scale_16(png_ptr);
# else
png_set_strip_16(png_ptr);
# endif
diff --git a/contrib/pngminim/decoder/pngusr.dfa b/contrib/pngminim/decoder/pngusr.dfa
index d9a1ff2bd..31260c99f 100644
--- a/contrib/pngminim/decoder/pngusr.dfa
+++ b/contrib/pngminim/decoder/pngusr.dfa
@@ -37,4 +37,4 @@ option SETJMP on
option STDIO on
option READ_EXPAND on
option READ_16_TO_8 on
-option READ_16_TO_8_ACCURATE_SCALE on
+option READ_STRIP_16_TO_8 on
diff --git a/contrib/pngminim/preader/pngusr.dfa b/contrib/pngminim/preader/pngusr.dfa
index 155137764..e5eae520f 100644
--- a/contrib/pngminim/preader/pngusr.dfa
+++ b/contrib/pngminim/preader/pngusr.dfa
@@ -37,5 +37,5 @@ option READ_bKGD on
option READ_GAMMA on
option READ_EXPAND on
option READ_16_TO_8 on
-option READ_CHOP_16_TO_8 on
+option READ_STRIP_16_TO_8 on
option READ_GRAY_TO_RGB on
diff --git a/contrib/visupng/PngFile.c b/contrib/visupng/PngFile.c
index 5cab576e4..3998c6d20 100644
--- a/contrib/visupng/PngFile.c
+++ b/contrib/visupng/PngFile.c
@@ -177,8 +177,8 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (iBitDepth == 16)
-# ifdef PNG_READ_CHOP_16_TO_8_SUPPORTED
- png_set_chop_16(png_ptr);
+# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+ png_set_scale_16(png_ptr);
# else
png_set_strip_16(png_ptr);
# endif
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 6e131ed77..f36a615ec 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,6 +1,6 @@
libpng-manual.txt - A description on how to use and modify libpng
- libpng version 1.5.4beta04 - June 16, 2011
+ libpng version 1.5.4beta05 - June 18, 2011
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
- libpng versions 0.97, January 1998, through 1.5.4beta04 - June 16, 2011
+ libpng versions 0.97, January 1998, through 1.5.4beta05 - June 18, 2011
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -847,12 +847,12 @@ interface or libpng API calls for the low level interface. For reference the
settings and API calls required are:
8-bit values:
- PNG_TRANSFORM_STRIP_16 | PNG_EXPAND
- png_set_expand(png_ptr); png_set_strip_16(png_ptr);
+ PNG_TRANSFORM_SCALE_16 | PNG_EXPAND
+ png_set_expand(png_ptr); png_set_scale_16(png_ptr);
If you must get exactly the same inaccurate results
produced by default in versions prior to libpng-1.5.4,
- use PNG_TRANSFORM_CHOP_16 and png_set_chop_16(png_ptr)
+ use PNG_TRANSFORM_STRIP_16 and png_set_strip_16(png_ptr)
instead.
16-bit values:
@@ -878,8 +878,10 @@ the entire image into memory, and (b) the input transformations
you want to do are limited to the following set:
PNG_TRANSFORM_IDENTITY No transformation
- PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to
- 8-bit
+ PNG_TRANSFORM_SCALE_16 Strip 16-bit samples to
+ 8-bit accurately
+ PNG_TRANSFORM_STRIP_16 Chop 16-bit samples to
+ 8-bit less accurately
PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel
PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit
samples to bytes
@@ -1404,12 +1406,12 @@ byte, unless png_set_packing() is called. 8-bit RGB data will be stored
in RGB RGB RGB format unless png_set_filler() or png_set_add_alpha()
is called to insert filler bytes, either before or after each RGB triplet.
16-bit RGB data will be returned RRGGBB RRGGBB, with the most significant
-byte of the color value first, unless png_set_strip_16() is called to
+byte of the color value first, unless png_set_scale_16() is called to
transform it to regular RGB RGB triplets, or png_set_filler() or
png_set_add alpha() is called to insert filler bytes, either before or
after each RRGGBB triplet. Similarly, 8-bit or 16-bit grayscale data can
-be modified with
-png_set_filler(), png_set_add_alpha(), or png_set_strip_16().
+be modified with png_set_filler(), png_set_add_alpha(), png_set_strip_16(),
+or png_set_scale_16().
The following code transforms grayscale images of less than 8 to 8 bits,
changes paletted images to RGB, and adds a full alpha channel if there is
@@ -1446,7 +1448,7 @@ PNG can have files with 16 bits per channel. If you only can handle
8 bits per channel, this will strip the pixels down to 8-bit.
if (bit_depth == 16)
- png_set_strip_16(png_ptr);
+ png_set_scale_16(png_ptr);
If you need to process the alpha channel on the image separately from the image
data (for example if you convert it to a bitmap mask) it is possible to have
@@ -4103,13 +4105,10 @@ use with textual data.
Prior to libpng-1.5.4, the PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
option was off by default, and slightly inaccurate scaling occurred.
-This option can no longer be turned off, and 16-to-8 scaling is always
-accurate. This change will result in some different results while
-reading 16-bit images, with none of the pixels being off-by-one any
-longer (see Clause 13.12 of the PNG specification). If you must
-have exactly the same inaccurate results that libpng produced by
-default previously, then you can use the png_set_chop_16() API instead
-of png_set_strip_16().
+This option can no longer be turned off, and the choice of accurate
+or inaccurate 16-to-8 scaling is by using the new png_set_scale_16_to_8()
+API for accurate scaling or the old png_set_strip_16_to_8() API for simple
+chopping.
Prior to libpng-1.5.4, the png_set_user_limits() function could only be
used to reduce the width and height limits from the value of
@@ -4425,13 +4424,13 @@ Other rules can be inferred by inspecting the libpng source.
XIV. Y2K Compliance in libpng
-June 16, 2011
+June 18, 2011
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.5.4beta04 are Y2K compliant. It is my belief that earlier
+upward through 1.5.4beta05 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
diff --git a/libpng.3 b/libpng.3
index fcf40e06b..634f21ec0 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "June 16, 2011"
+.TH LIBPNG 3 "June 18, 2011"
.SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.4beta04
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.4beta05
.SH SYNOPSIS
\fI\fB
@@ -955,7 +955,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng-manual.txt - A description on how to use and modify libpng
- libpng version 1.5.4beta04 - June 16, 2011
+ libpng version 1.5.4beta05 - June 18, 2011
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -966,7 +966,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
- libpng versions 0.97, January 1998, through 1.5.4beta04 - June 16, 2011
+ libpng versions 0.97, January 1998, through 1.5.4beta05 - June 18, 2011
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -1802,12 +1802,12 @@ interface or libpng API calls for the low level interface. For reference the
settings and API calls required are:
8-bit values:
- PNG_TRANSFORM_STRIP_16 | PNG_EXPAND
- png_set_expand(png_ptr); png_set_strip_16(png_ptr);
+ PNG_TRANSFORM_SCALE_16 | PNG_EXPAND
+ png_set_expand(png_ptr); png_set_scale_16(png_ptr);
If you must get exactly the same inaccurate results
produced by default in versions prior to libpng-1.5.4,
- use PNG_TRANSFORM_CHOP_16 and png_set_chop_16(png_ptr)
+ use PNG_TRANSFORM_STRIP_16 and png_set_strip_16(png_ptr)
instead.
16-bit values:
@@ -1833,8 +1833,10 @@ the entire image into memory, and (b) the input transformations
you want to do are limited to the following set:
PNG_TRANSFORM_IDENTITY No transformation
- PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to
- 8-bit
+ PNG_TRANSFORM_SCALE_16 Strip 16-bit samples to
+ 8-bit accurately
+ PNG_TRANSFORM_STRIP_16 Chop 16-bit samples to
+ 8-bit less accurately
PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel
PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit
samples to bytes
@@ -2359,12 +2361,12 @@ byte, unless png_set_packing() is called. 8-bit RGB data will be stored
in RGB RGB RGB format unless png_set_filler() or png_set_add_alpha()
is called to insert filler bytes, either before or after each RGB triplet.
16-bit RGB data will be returned RRGGBB RRGGBB, with the most significant
-byte of the color value first, unless png_set_strip_16() is called to
+byte of the color value first, unless png_set_scale_16() is called to
transform it to regular RGB RGB triplets, or png_set_filler() or
png_set_add alpha() is called to insert filler bytes, either before or
after each RRGGBB triplet. Similarly, 8-bit or 16-bit grayscale data can
-be modified with
-png_set_filler(), png_set_add_alpha(), or png_set_strip_16().
+be modified with png_set_filler(), png_set_add_alpha(), png_set_strip_16(),
+or png_set_scale_16().
The following code transforms grayscale images of less than 8 to 8 bits,
changes paletted images to RGB, and adds a full alpha channel if there is
@@ -2401,7 +2403,7 @@ PNG can have files with 16 bits per channel. If you only can handle
8 bits per channel, this will strip the pixels down to 8-bit.
if (bit_depth == 16)
- png_set_strip_16(png_ptr);
+ png_set_scale_16(png_ptr);
If you need to process the alpha channel on the image separately from the image
data (for example if you convert it to a bitmap mask) it is possible to have
@@ -5058,13 +5060,10 @@ use with textual data.
Prior to libpng-1.5.4, the PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
option was off by default, and slightly inaccurate scaling occurred.
-This option can no longer be turned off, and 16-to-8 scaling is always
-accurate. This change will result in some different results while
-reading 16-bit images, with none of the pixels being off-by-one any
-longer (see Clause 13.12 of the PNG specification). If you must
-have exactly the same inaccurate results that libpng produced by
-default previously, then you can use the png_set_chop_16() API instead
-of png_set_strip_16().
+This option can no longer be turned off, and the choice of accurate
+or inaccurate 16-to-8 scaling is by using the new png_set_scale_16_to_8()
+API for accurate scaling or the old png_set_strip_16_to_8() API for simple
+chopping.
Prior to libpng-1.5.4, the png_set_user_limits() function could only be
used to reduce the width and height limits from the value of
@@ -5380,13 +5379,13 @@ Other rules can be inferred by inspecting the libpng source.
.SH XIV. Y2K Compliance in libpng
-June 16, 2011
+June 18, 2011
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.5.4beta04 are Y2K compliant. It is my belief that earlier
+upward through 1.5.4beta05 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
@@ -5579,7 +5578,7 @@ the first widely used release:
1.5.3rc01-02 15 10503 15.so.15.3[.0]
1.5.3beta11 15 10503 15.so.15.3[.0]
1.5.3 [omitted]
- 1.5.4beta01-03 15 10504 15.so.15.4[.0]
+ 1.5.4beta01-05 15 10504 15.so.15.4[.0]
Henceforth the source version will match the shared-library minor
and patch numbers; the shared-library major version number will be
@@ -5636,7 +5635,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
-Libpng version 1.5.4beta04 - June 16, 2011:
+Libpng version 1.5.4beta05 - June 18, 2011:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@@ -5659,7 +5658,7 @@ this sentence.
This code is released under the libpng license.
-libpng versions 1.2.6, August 15, 2004, through 1.5.4beta04, June 16, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.4beta05, June 18, 2011, are
Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@@ -5758,7 +5757,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
-June 16, 2011
+June 18, 2011
.\" end of man page
diff --git a/libpngpf.3 b/libpngpf.3
index e6478f1bc..a507ef245 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,4 +1,4 @@
-.TH LIBPNGPF 3 "June 16, 2011"
+.TH LIBPNGPF 3 "June 18, 2011"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.5.4beta05
(private functions)
diff --git a/png.5 b/png.5
index f1d2e83fd..881bb1827 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "June 16, 2011"
+.TH PNG 5 "June 18, 2011"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION
diff --git a/pngconf.h b/pngconf.h
index 1a8c81a32..127568daa 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng
*
- * libpng version 1.5.4beta05 - June 16, 2011
+ * libpng version 1.5.4beta05 - June 18, 2011
*
* Copyright (c) 1998-2011 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt
index 9fd8dd698..628e78e22 100644
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@
VisualStudio instructions
-libpng version 1.5.4beta05 - June 16, 2011
+libpng version 1.5.4beta05 - June 18, 2011
Copyright (c) 1998-2010 Glenn Randers-Pehrson
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index d532b17d5..011a19251 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
<!--
* zlib.props - location of zlib source
*
- * libpng version 1.5.4beta05 - June 16, 2011
+ * libpng version 1.5.4beta05 - June 18, 2011
*
* Copyright (c) 1998-2011 Glenn Randers-Pehrson
*
diff --git a/scripts/README.txt b/scripts/README.txt
index d5e2fb48b..58f487515 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,5 +1,5 @@
-Makefiles for libpng version 1.5.4beta05 - June 16, 2011
+Makefiles for libpng version 1.5.4beta05 - June 18, 2011
pnglibconf.h.prebuilt => Stores configuration settings
makefile.linux => Linux/ELF makefile
diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index fb9099097..19920ce83 100644
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -556,7 +556,8 @@ option READ_16_TO_8_ACCURATE_SCALE requires READ_16_TO_8
# added at libpng-1.5.4
-option READ_CHOP_16_TO_8 requires READ_16_TO_8
+option READ_SCALE_16_TO_8 requires READ_16_TO_8
+option READ_STRIP_16_TO_8 requires READ_16_TO_8
option WRITE_OPTIMIZE_CMF requires WRITE
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index 78df974a3..f377b0119 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -76,7 +76,8 @@
#define PNG_READ_BGR_SUPPORTED
#define PNG_READ_bKGD_SUPPORTED
#define PNG_READ_cHRM_SUPPORTED
-#define PNG_READ_CHOP_16_TO_8_SUPPORTED
+#define PNG_READ_SCALE_16_TO_8_SUPPORTED
+#define PNG_READ_STRIP_16_TO_8_SUPPORTED
#define PNG_READ_COMPOSITE_NODIV_SUPPORTED
#define PNG_READ_EXPAND_16_SUPPORTED
#define PNG_READ_EXPAND_SUPPORTED
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