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libpng: Update to upstream version 1.6.30

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This commit is contained in:
Rémi Verschelde 2017-07-14 22:36:01 +02:00
parent e70d36071e
commit b1ca62af52
11 changed files with 123 additions and 67 deletions
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2
thirdparty/README.md vendored
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@ -107,7 +107,7 @@ Files extracted from upstream source:
## libpng
- Upstream: http://libpng.org/pub/png/libpng.html
- Version: 1.6.28
- Version: 1.6.30
- License: libpng/zlib
Files extracted from upstream source:

55
thirdparty/libpng/png.c vendored
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@ -1,7 +1,7 @@
/* png.c - location for general purpose libpng functions
*
* Last changed in libpng 1.6.29 [March 16, 2017]
* Last changed in libpng 1.6.30 [(PENDING RELEASE)]
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -14,7 +14,7 @@
#include "pngpriv.h"
/* Generate a compiler error if there is an old png.h in the search path. */
typedef png_libpng_version_1_6_29 Your_png_h_is_not_version_1_6_29;
typedef png_libpng_version_1_6_30 Your_png_h_is_not_version_1_6_30;
/* Tells libpng that we have already handled the first "num_bytes" bytes
* of the PNG file signature. If the PNG data is embedded into another
@ -776,14 +776,14 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.6.29 - March 16, 2017" PNG_STRING_NEWLINE \
"libpng version 1.6.30 - June 28, 2017" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson" \
PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
# else
return "libpng version 1.6.29 - March 16, 2017\
return "libpng version 1.6.30 - June 28, 2017\
Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@ -2832,7 +2832,7 @@ png_pow10(int power)
if (power < 0)
{
if (power < DBL_MIN_10_EXP) return 0;
recip = 1, power = -power;
recip = 1; power = -power;
}
if (power > 0)
@ -2910,7 +2910,9 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
double test = png_pow10(exp_b10+1);
if (test <= DBL_MAX)
++exp_b10, base = test;
{
++exp_b10; base = test;
}
else
break;
@ -2924,7 +2926,10 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
* test on DBL_MAX above.
*/
fp /= base;
while (fp >= 1) fp /= 10, ++exp_b10;
while (fp >= 1)
{
fp /= 10; ++exp_b10;
}
/* Because of the code above fp may, at this point, be
* less than .1, this is ok because the code below can
@ -2975,7 +2980,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
/* Rounding up to 10, handle that here. */
if (czero > 0)
{
--czero, d = 1;
--czero; d = 1;
if (cdigits == 0) --clead;
}
else
@ -2989,7 +2994,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
else if (ch == 46)
{
ch = *--ascii, ++size;
ch = *--ascii; ++size;
/* Advance exp_b10 to '1', so that the
* decimal point happens after the
* previous digit.
@ -3016,7 +3021,9 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
int ch = *--ascii;
if (ch == 46)
++size, exp_b10 = 1;
{
++size; exp_b10 = 1;
}
/* Else lost a leading zero, so 'exp_b10' is
* still ok at (-1)
@ -3052,21 +3059,26 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
*/
if (exp_b10 != (-1))
{
if (exp_b10 == 0) *ascii++ = 46, --size;
if (exp_b10 == 0)
{
*ascii++ = 46; --size;
}
/* PLUS 1: TOTAL 4 */
--exp_b10;
}
*ascii++ = 48, --czero;
*ascii++ = 48; --czero;
}
if (exp_b10 != (-1))
{
if (exp_b10 == 0)
*ascii++ = 46, --size; /* counted above */
{
*ascii++ = 46; --size; /* counted above */
}
--exp_b10;
}
*ascii++ = (char)(48 + (int)d), ++cdigits;
*ascii++ = (char)(48 + (int)d); ++cdigits;
}
}
while (cdigits+czero < precision+clead && fp > DBL_MIN);
@ -3107,7 +3119,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
*/
size -= cdigits;
*ascii++ = 69, --size; /* 'E': PLUS 1 TOTAL 2+precision */
*ascii++ = 69; --size; /* 'E': PLUS 1 TOTAL 2+precision */
/* The following use of an unsigned temporary avoids ambiguities in
* the signed arithmetic on exp_b10 and permits GCC at least to do
@ -3118,7 +3130,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
if (exp_b10 < 0)
{
*ascii++ = 45, --size; /* '-': PLUS 1 TOTAL 3+precision */
*ascii++ = 45; --size; /* '-': PLUS 1 TOTAL 3+precision */
uexp_b10 = (unsigned int)(-exp_b10);
}
@ -3185,7 +3197,9 @@ png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii,
/* Avoid overflow here on the minimum integer. */
if (fp < 0)
*ascii++ = 45, num = (png_uint_32)(-fp);
{
*ascii++ = 45; num = (png_uint_32)(-fp);
}
else
num = (png_uint_32)fp;
@ -3223,7 +3237,10 @@ png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii,
* then ndigits digits to first:
*/
i = 5;
while (ndigits < i) *ascii++ = 48, --i;
while (ndigits < i)
{
*ascii++ = 48; --i;
}
while (ndigits >= first) *ascii++ = digits[--ndigits];
/* Don't output the trailing zeros! */
}
@ -4278,7 +4295,7 @@ png_set_option(png_structrp png_ptr, int option, int onoff)
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
/* sRGB conversion tables; these are machine generated with the code in
* contrib/tools/makesRGB.c. The actual sRGB transfer curve defined in the
* specification (see the article at http://en.wikipedia.org/wiki/SRGB)
* specification (see the article at https://en.wikipedia.org/wiki/SRGB)
* is used, not the gamma=1/2.2 approximation use elsewhere in libpng.
* The sRGB to linear table is exact (to the nearest 16-bit linear fraction).
* The inverse (linear to sRGB) table has accuracies as follows:

26
thirdparty/libpng/png.h vendored
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@ -1,7 +1,7 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.6.29, March 16, 2017
* libpng version 1.6.30, June 28, 2017
*
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@ -12,7 +12,7 @@
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
* libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.6.29, March 16, 2017:
* libpng versions 0.97, January 1998, through 1.6.30, June 28, 2017:
* Glenn Randers-Pehrson.
* See also "Contributing Authors", below.
*/
@ -25,7 +25,7 @@
*
* This code is released under the libpng license.
*
* libpng versions 1.0.7, July 1, 2000 through 1.6.29, March 16, 2017 are
* libpng versions 1.0.7, July 1, 2000 through 1.6.30, June 28, 2017 are
* Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
* derived from libpng-1.0.6, and are distributed according to the same
* disclaimer and license as libpng-1.0.6 with the following individuals
@ -213,7 +213,7 @@
* ...
* 1.5.28 15 10527 15.so.15.28[.0]
* ...
* 1.6.29 16 10629 16.so.16.29[.0]
* 1.6.30 16 10630 16.so.16.30[.0]
*
* Henceforth the source version will match the shared-library major
* and minor numbers; the shared-library major version number will be
@ -234,20 +234,20 @@
*
* See libpng.txt or libpng.3 for more information. The PNG specification
* is available as a W3C Recommendation and as an ISO Specification,
* <http://www.w3.org/TR/2003/REC-PNG-20031110/
* <https://www.w3.org/TR/2003/REC-PNG-20031110/
*/
/*
* Y2K compliance in libpng:
* =========================
*
* March 16, 2017
* June 28, 2017
*
* 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 1.6.29 are Y2K compliant. It is my belief that
* upward through 1.6.30 are Y2K compliant. It is my belief that
* earlier versions were also Y2K compliant.
*
* Libpng only has two year fields. One is a 2-byte unsigned integer
@ -309,8 +309,8 @@
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.6.29"
#define PNG_HEADER_VERSION_STRING " libpng version 1.6.29 - March 16, 2017\n"
#define PNG_LIBPNG_VER_STRING "1.6.30"
#define PNG_HEADER_VERSION_STRING " libpng version 1.6.30 - June 28, 2017\n"
#define PNG_LIBPNG_VER_SONUM 16
#define PNG_LIBPNG_VER_DLLNUM 16
@ -318,7 +318,7 @@
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
#define PNG_LIBPNG_VER_MAJOR 1
#define PNG_LIBPNG_VER_MINOR 6
#define PNG_LIBPNG_VER_RELEASE 29
#define PNG_LIBPNG_VER_RELEASE 30
/* This should match the numeric part of the final component of
* PNG_LIBPNG_VER_STRING, omitting any leading zero:
@ -349,7 +349,7 @@
* version 1.0.0 was mis-numbered 100 instead of 10000). From
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
*/
#define PNG_LIBPNG_VER 10629 /* 1.6.29 */
#define PNG_LIBPNG_VER 10630 /* 1.6.30 */
/* Library configuration: these options cannot be changed after
* the library has been built.
@ -459,7 +459,7 @@ extern "C" {
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
typedef char* png_libpng_version_1_6_29;
typedef char* png_libpng_version_1_6_30;
/* Basic control structions. Read libpng-manual.txt or libpng.3 for more info.
*
@ -2753,7 +2753,7 @@ typedef struct
*
* When the simplified API needs to convert between sRGB and linear colorspaces,
* the actual sRGB transfer curve defined in the sRGB specification (see the
* article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
* article at https://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
* approximation used elsewhere in libpng.
*
* When an alpha channel is present it is expected to denote pixel coverage

2
thirdparty/libpng/pngconf.h vendored
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@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng version 1.6.29, March 16, 2017
* libpng version 1.6.30, June 28, 2017
*
* Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

6
thirdparty/libpng/pnglibconf.h vendored
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@ -1,10 +1,10 @@
/* libpng 1.6.29 STANDARD API DEFINITION */
/* libpng 1.6.30 STANDARD API DEFINITION */
/* pnglibconf.h - library build configuration */
/* Libpng version 1.6.29 - March 16, 2017 */
/* Libpng version 1.6.30 - June 28, 2017 */
/* Copyright (c) 1998-2015 Glenn Randers-Pehrson */
/* Copyright (c) 1998-2017 Glenn Randers-Pehrson */
/* This code is released under the libpng license. */
/* For conditions of distribution and use, see the disclaimer */

13
thirdparty/libpng/pngpriv.h vendored
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@ -1,7 +1,7 @@
/* pngpriv.h - private declarations for use inside libpng
*
* Last changed in libpng 1.6.29 [March 16, 2017]
* Last changed in libpng 1.6.30 [(PENDING RELEASE)]
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -466,7 +466,16 @@
static_cast<type>(static_cast<const void*>(value))
#else
# define png_voidcast(type, value) (value)
# define png_constcast(type, value) ((type)(value))
# ifdef _WIN64
# ifdef __GNUC__
typedef unsigned long long png_ptruint;
# else
typedef unsigned __int64 png_ptruint;
# endif
# else
typedef unsigned long png_ptruint;
# endif
# define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
# define png_aligncast(type, value) ((void*)(value))
# define png_aligncastconst(type, value) ((const void*)(value))
#endif /* __cplusplus */

8
thirdparty/libpng/pngrtran.c vendored
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@ -1,7 +1,7 @@
/* pngrtran.c - transforms the data in a row for PNG readers
*
* Last changed in libpng 1.6.29 [March 16, 2017]
* Last changed in libpng 1.6.30 [(PENDING RELEASE)]
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -2934,7 +2934,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
* using the equation given in Poynton's ColorFAQ of 1998-01-04 at
* <http://www.inforamp.net/~poynton/> (THIS LINK IS DEAD June 2008 but
* versions dated 1998 through November 2002 have been archived at
* http://web.archive.org/web/20000816232553/http://www.inforamp.net/
* https://web.archive.org/web/20000816232553/www.inforamp.net/
* ~poynton/notes/colour_and_gamma/ColorFAQ.txt )
* Charles Poynton poynton at poynton.com
*
@ -4601,7 +4601,9 @@ png_do_expand_16(png_row_infop row_info, png_bytep row)
png_byte *sp = row + row_info->rowbytes; /* source, last byte + 1 */
png_byte *dp = sp + row_info->rowbytes; /* destination, end + 1 */
while (dp > sp)
dp[-2] = dp[-1] = *--sp, dp -= 2;
{
dp[-2] = dp[-1] = *--sp; dp -= 2;
}
row_info->rowbytes *= 2;
row_info->bit_depth = 16;

19
thirdparty/libpng/pngrutil.c vendored
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@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.6.29 [March 16, 2017]
* Last changed in libpng 1.6.30 [(PENDING RELEASE)]
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -2537,6 +2537,9 @@ png_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
png_ptr->mode |= PNG_AFTER_IDAT;
/* Note, "length" is sufficient here; we won't be adding
* a null terminator later.
*/
buffer = png_read_buffer(png_ptr, length, 2/*silent*/);
if (buffer == NULL)
@ -3377,7 +3380,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
*/
do
{
dp[0] = sp[0], dp[1] = sp[1];
dp[0] = sp[0]; dp[1] = sp[1];
if (row_width <= bytes_to_jump)
return;
@ -3398,7 +3401,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
*/
for (;;)
{
dp[0] = sp[0], dp[1] = sp[1], dp[2] = sp[2];
dp[0] = sp[0]; dp[1] = sp[1]; dp[2] = sp[2];
if (row_width <= bytes_to_jump)
return;
@ -3887,7 +3890,10 @@ png_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row,
/* Find the best predictor, the least of pa, pb, pc favoring the earlier
* ones in the case of a tie.
*/
if (pb < pa) pa = pb, a = b;
if (pb < pa)
{
pa = pb; a = b;
}
if (pc < pa) a = c;
/* Calculate the current pixel in a, and move the previous row pixel to c
@ -3939,7 +3945,10 @@ png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
if (pb < pa) pa = pb, a = b;
if (pb < pa)
{
pa = pb; a = b;
}
if (pc < pa) a = c;
a += *row;

15
thirdparty/libpng/pngset.c vendored
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@ -1,8 +1,8 @@
/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.6.26 [October 20, 2016]
* Copyright (c) 1998-2016 Glenn Randers-Pehrson
* Last changed in libpng 1.6.30 [(PENDING RELEASE)]
* Copyright (c) 1998-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
@ -1102,8 +1102,9 @@ png_set_sPLT(png_const_structrp png_ptr,
info_ptr->valid |= PNG_INFO_sPLT;
++(info_ptr->splt_palettes_num);
++np;
++entries;
}
while (++entries, --nentries);
while (--nentries);
if (nentries > 0)
png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
@ -1696,14 +1697,16 @@ png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
png_byte ch = (png_byte)*key++;
if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
*new_key++ = ch, ++key_len, space = 0;
{
*new_key++ = ch; ++key_len; space = 0;
}
else if (space == 0)
{
/* A space or an invalid character when one wasn't seen immediately
* before; output just a space.
*/
*new_key++ = 32, ++key_len, space = 1;
*new_key++ = 32; ++key_len; space = 1;
/* If the character was not a space then it is invalid. */
if (ch != 32)
@ -1716,7 +1719,7 @@ png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
if (key_len > 0 && space != 0) /* trailing space */
{
--key_len, --new_key;
--key_len; --new_key;
if (bad_character == 0)
bad_character = 32;
}

38
thirdparty/libpng/pngtrans.c vendored
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@ -1,8 +1,8 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Last changed in libpng 1.6.26 [October 20, 2016]
* Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
* Last changed in libpng 1.6.30 [(PENDING RELEASE)]
* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
@ -514,11 +514,15 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channel and, for sp, the filler */
sp += 2, ++dp;
{
sp += 2; ++dp;
}
/* For a 1 pixel wide image there is nothing to do */
while (sp < ep)
*dp++ = *sp, sp += 2;
{
*dp++ = *sp; sp += 2;
}
row_info->pixel_depth = 8;
}
@ -528,10 +532,14 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channel and, for sp, the filler */
sp += 4, dp += 2;
{
sp += 4; dp += 2;
}
while (sp < ep)
*dp++ = *sp++, *dp++ = *sp, sp += 3;
{
*dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 16;
}
@ -554,11 +562,15 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channels and, for sp, the filler */
sp += 4, dp += 3;
{
sp += 4; dp += 3;
}
/* Note that the loop adds 3 to dp and 4 to sp each time. */
while (sp < ep)
*dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;
{
*dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp; sp += 2;
}
row_info->pixel_depth = 24;
}
@ -568,14 +580,16 @@ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channels and, for sp, the filler */
sp += 8, dp += 6;
{
sp += 8; dp += 6;
}
while (sp < ep)
{
/* Copy 6 bytes, skip 2 */
*dp++ = *sp++, *dp++ = *sp++;
*dp++ = *sp++, *dp++ = *sp++;
*dp++ = *sp++, *dp++ = *sp, sp += 3;
*dp++ = *sp++; *dp++ = *sp++;
*dp++ = *sp++; *dp++ = *sp++;
*dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 48;

6
thirdparty/libpng/pngwutil.c vendored
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@ -1003,7 +1003,8 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
optimize_cmf(data, png_image_size(png_ptr));
#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
if (size > 0)
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->zstream.next_out = data;
@ -1049,7 +1050,8 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
optimize_cmf(data, png_image_size(png_ptr));
#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
if (size > 0)
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
png_ptr->zstream.avail_out = 0;
png_ptr->zstream.next_out = NULL;
png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;