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update libpng to from 1.6.17 to 1.6.21

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This commit is contained in:
Julien Malik 2016-04-21 18:49:15 +02:00
parent e1a93d9e59
commit 889bf16791
22 changed files with 1287 additions and 1993 deletions
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55
thirdparty/libpng/LICENSE vendored
View File

@ -10,21 +10,18 @@ this sentence.
This code is released under the libpng license.
libpng versions 1.2.6, August 15, 2004, through 1.6.17, March 26, 2015, are
Copyright (c) 2004, 2006-2015 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
Cosmin Truta
libpng versions 1.0.7, July 1, 2000, through 1.2.5 - October 3, 2002, are
Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.0.6
with the following individuals added to the list of Contributing Authors
libpng versions 1.0.7, July 1, 2000, through 1.6.21, January 15, 2016, are
Copyright (c) 2000-2002, 2004, 2006-2016 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
added to the list of Contributing Authors:
Simon-Pierre Cadieux
Eric S. Raymond
Mans Rullgard
Cosmin Truta
Gilles Vollant
James Yu
and with the following additions to the disclaimer:
@ -36,18 +33,20 @@ and with the following additions to the disclaimer:
the user.
libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-0.96,
with the following individuals added to the list of Contributing Authors:
Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
libpng-0.96, and are distributed according to the same disclaimer and
license as libpng-0.96, with the following individuals added to the list
of Contributing Authors:
Tom Lane
Glenn Randers-Pehrson
Willem van Schaik
libpng versions 0.89, June 1996, through 0.96, May 1997, are
Copyright (c) 1996, 1997 Andreas Dilger
Distributed according to the same disclaimer and license as libpng-0.88,
with the following individuals added to the list of Contributing Authors:
Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
and are distributed according to the same disclaimer and license as
libpng-0.88, with the following individuals added to the list of
Contributing Authors:
John Bowler
Kevin Bracey
@ -57,7 +56,7 @@ with the following individuals added to the list of Contributing Authors:
Tom Tanner
libpng versions 0.5, May 1995, through 0.88, January 1996, are
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
@ -80,13 +79,13 @@ Permission is hereby granted to use, copy, modify, and distribute this
source code, or portions hereof, for any purpose, without fee, subject
to the following restrictions:
1. The origin of this source code must not be misrepresented.
1. The origin of this source code must not be misrepresented.
2. Altered versions must be plainly marked as such and must not
be misrepresented as being the original source.
2. Altered versions must be plainly marked as such and must not
be misrepresented as being the original source.
3. This Copyright notice may not be removed or altered from any
source or altered source distribution.
3. This Copyright notice may not be removed or altered from any
source or altered source distribution.
The Contributing Authors and Group 42, Inc. specifically permit, without
fee, and encourage the use of this source code as a component to
@ -94,18 +93,20 @@ supporting the PNG file format in commercial products. If you use this
source code in a product, acknowledgment is not required but would be
appreciated.
END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
A "png_get_copyright" function is available, for convenient use in "about"
boxes and the like:
printf("%s",png_get_copyright(NULL));
printf("%s", png_get_copyright(NULL));
Also, the PNG logo (in PNG format, of course) is supplied in the
files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
Libpng is OSI Certified Open Source Software. OSI Certified Open Source is a
certification mark of the Open Source Initiative.
Libpng is OSI Certified Open Source Software. OSI Certified Open Source is
a certification mark of the Open Source Initiative. OSI has not addressed
the additional disclaimers inserted at version 1.0.7.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
March 26, 2015
January 15, 2016

171
thirdparty/libpng/png.c vendored
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@ -1,8 +1,8 @@
/* png.c - location for general purpose libpng functions
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.19 [November 12, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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_17 Your_png_h_is_not_version_1_6_17;
typedef png_libpng_version_1_6_21 Your_png_h_is_not_version_1_6_21;
/* 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
@ -26,15 +26,20 @@ typedef png_libpng_version_1_6_17 Your_png_h_is_not_version_1_6_17;
void PNGAPI
png_set_sig_bytes(png_structrp png_ptr, int num_bytes)
{
unsigned int nb = (unsigned int)num_bytes;
png_debug(1, "in png_set_sig_bytes");
if (png_ptr == NULL)
return;
if (num_bytes > 8)
if (num_bytes < 0)
nb = 0;
if (nb > 8)
png_error(png_ptr, "Too many bytes for PNG signature");
png_ptr->sig_bytes = (png_byte)((num_bytes < 0 ? 0 : num_bytes) & 0xff);
png_ptr->sig_bytes = (png_byte)nb;
}
/* Checks whether the supplied bytes match the PNG signature. We allow
@ -101,7 +106,7 @@ png_zfree(voidpf png_ptr, voidpf ptr)
void /* PRIVATE */
png_reset_crc(png_structrp png_ptr)
{
/* The cast is safe because the crc is a 32 bit value. */
/* The cast is safe because the crc is a 32-bit value. */
png_ptr->crc = (png_uint_32)crc32(0, Z_NULL, 0);
}
@ -129,7 +134,7 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
}
/* 'uLong' is defined in zlib.h as unsigned long; this means that on some
* systems it is a 64 bit value. crc32, however, returns 32 bits so the
* systems it is a 64-bit value. crc32, however, returns 32 bits so the
* following cast is safe. 'uInt' may be no more than 16 bits, so it is
* necessary to perform a loop here.
*/
@ -243,15 +248,15 @@ png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
create_struct.user_height_max = PNG_USER_HEIGHT_MAX;
# ifdef PNG_USER_CHUNK_CACHE_MAX
/* Added at libpng-1.2.43 and 1.4.0 */
create_struct.user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;
/* Added at libpng-1.2.43 and 1.4.0 */
create_struct.user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;
# endif
# ifdef PNG_USER_CHUNK_MALLOC_MAX
/* Added at libpng-1.2.43 and 1.4.1, required only for read but exists
* in png_struct regardless.
*/
create_struct.user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;
/* Added at libpng-1.2.43 and 1.4.1, required only for read but exists
* in png_struct regardless.
*/
create_struct.user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;
# endif
# endif
@ -275,7 +280,9 @@ png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
# ifdef PNG_SETJMP_SUPPORTED
if (!setjmp(create_jmp_buf))
# endif
{
# ifdef PNG_SETJMP_SUPPORTED
/* Temporarily fake out the longjmp information until we have
* successfully completed this function. This only works if we have
* setjmp() support compiled in, but it is safe - this stuff should
@ -284,8 +291,6 @@ png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
create_struct.jmp_buf_ptr = &create_jmp_buf;
create_struct.jmp_buf_size = 0; /*stack allocation*/
create_struct.longjmp_fn = longjmp;
# else
{
# endif
/* Call the general version checker (shared with read and write code):
*/
@ -304,10 +309,10 @@ png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
create_struct.zstream.opaque = png_ptr;
# ifdef PNG_SETJMP_SUPPORTED
/* Eliminate the local error handling: */
create_struct.jmp_buf_ptr = NULL;
create_struct.jmp_buf_size = 0;
create_struct.longjmp_fn = 0;
/* Eliminate the local error handling: */
create_struct.jmp_buf_ptr = NULL;
create_struct.jmp_buf_size = 0;
create_struct.longjmp_fn = 0;
# endif
*png_ptr = create_struct;
@ -413,6 +418,8 @@ png_info_init_3,(png_infopp ptr_ptr, png_size_t png_info_struct_size),
free(info_ptr);
info_ptr = png_voidcast(png_inforp, png_malloc_base(NULL,
(sizeof *info_ptr)));
if (info_ptr == NULL)
return;
*ptr_ptr = info_ptr;
}
@ -664,19 +671,20 @@ png_init_io(png_structrp png_ptr, png_FILE_p fp)
# endif
# ifdef PNG_SAVE_INT_32_SUPPORTED
/* The png_save_int_32 function assumes integers are stored in two's
* complement format. If this isn't the case, then this routine needs to
* be modified to write data in two's complement format. Note that,
* the following works correctly even if png_int_32 has more than 32 bits
* (compare the more complex code required on read for sign extension.)
/* PNG signed integers are saved in 32-bit 2's complement format. ANSI C-90
* defines a cast of a signed integer to an unsigned integer either to preserve
* the value, if it is positive, or to calculate:
*
* (UNSIGNED_MAX+1) + integer
*
* Where UNSIGNED_MAX is the appropriate maximum unsigned value, so when the
* negative integral value is added the result will be an unsigned value
* correspnding to the 2's complement representation.
*/
void PNGAPI
png_save_int_32(png_bytep buf, png_int_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
buf[1] = (png_byte)((i >> 16) & 0xff);
buf[2] = (png_byte)((i >> 8) & 0xff);
buf[3] = (png_byte)(i & 0xff);
png_save_uint_32(buf, i);
}
# endif
@ -722,6 +730,7 @@ png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime)
APPEND(':');
APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second);
APPEND_STRING(" +0000"); /* This reliably terminates the buffer */
PNG_UNUSED (pos)
# undef APPEND
# undef APPEND_NUMBER
@ -766,14 +775,15 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.6.17 - March 26, 2015" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2015 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;
"libpng version 1.6.21 - January 15, 2016" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2002,2004,2006-2016 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 1.6.17 - March 26, 2015\
Copyright (c) 1998-2015 Glenn Randers-Pehrson\
return "libpng version 1.6.21 - January 15, 2016\
Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
# endif
@ -811,9 +821,9 @@ png_get_header_version(png_const_structrp png_ptr)
#ifdef __STDC__
return PNG_HEADER_VERSION_STRING
# ifndef PNG_READ_SUPPORTED
" (NO READ SUPPORT)"
" (NO READ SUPPORT)"
# endif
PNG_STRING_NEWLINE;
PNG_STRING_NEWLINE;
#else
return PNG_HEADER_VERSION_STRING;
#endif
@ -1086,10 +1096,10 @@ png_colorspace_set_gamma(png_const_structrp png_ptr,
errmsg = "gamma value out of range";
# ifdef PNG_READ_gAMA_SUPPORTED
/* Allow the application to set the gamma value more than once */
else if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
(colorspace->flags & PNG_COLORSPACE_FROM_gAMA) != 0)
errmsg = "duplicate";
/* Allow the application to set the gamma value more than once */
else if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
(colorspace->flags & PNG_COLORSPACE_FROM_gAMA) != 0)
errmsg = "duplicate";
# endif
/* Do nothing if the colorspace is already invalid */
@ -1130,31 +1140,31 @@ png_colorspace_sync_info(png_const_structrp png_ptr, png_inforp info_ptr)
PNG_INFO_iCCP);
# ifdef PNG_COLORSPACE_SUPPORTED
/* Clean up the iCCP profile now if it won't be used. */
png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, -1/*not used*/);
/* Clean up the iCCP profile now if it won't be used. */
png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, -1/*not used*/);
# else
PNG_UNUSED(png_ptr)
PNG_UNUSED(png_ptr)
# endif
}
else
{
# ifdef PNG_COLORSPACE_SUPPORTED
/* Leave the INFO_iCCP flag set if the pngset.c code has already set
* it; this allows a PNG to contain a profile which matches sRGB and
* yet still have that profile retrievable by the application.
*/
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_MATCHES_sRGB) != 0)
info_ptr->valid |= PNG_INFO_sRGB;
/* Leave the INFO_iCCP flag set if the pngset.c code has already set
* it; this allows a PNG to contain a profile which matches sRGB and
* yet still have that profile retrievable by the application.
*/
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_MATCHES_sRGB) != 0)
info_ptr->valid |= PNG_INFO_sRGB;
else
info_ptr->valid &= ~PNG_INFO_sRGB;
else
info_ptr->valid &= ~PNG_INFO_sRGB;
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
info_ptr->valid |= PNG_INFO_cHRM;
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
info_ptr->valid |= PNG_INFO_cHRM;
else
info_ptr->valid &= ~PNG_INFO_cHRM;
else
info_ptr->valid &= ~PNG_INFO_cHRM;
# endif
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0)
@ -1235,16 +1245,17 @@ png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy)
/* Check xy and, implicitly, z. Note that wide gamut color spaces typically
* have end points with 0 tristimulus values (these are impossible end
* points, but they are used to cover the possible colors.)
* points, but they are used to cover the possible colors). We check
* xy->whitey against 5, not 0, to avoid a possible integer overflow.
*/
if (xy->redx < 0 || xy->redx > PNG_FP_1) return 1;
if (xy->redy < 0 || xy->redy > PNG_FP_1-xy->redx) return 1;
if (xy->redx < 0 || xy->redx > PNG_FP_1) return 1;
if (xy->redy < 0 || xy->redy > PNG_FP_1-xy->redx) return 1;
if (xy->greenx < 0 || xy->greenx > PNG_FP_1) return 1;
if (xy->greeny < 0 || xy->greeny > PNG_FP_1-xy->greenx) return 1;
if (xy->bluex < 0 || xy->bluex > PNG_FP_1) return 1;
if (xy->bluey < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1;
if (xy->bluex < 0 || xy->bluex > PNG_FP_1) return 1;
if (xy->bluey < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1;
if (xy->whitex < 0 || xy->whitex > PNG_FP_1) return 1;
if (xy->whitey < 0 || xy->whitey > PNG_FP_1-xy->whitex) return 1;
if (xy->whitey < 5 || xy->whitey > PNG_FP_1-xy->whitex) return 1;
/* The reverse calculation is more difficult because the original tristimulus
* value had 9 independent values (red,green,blue)x(X,Y,Z) however only 8
@ -1702,7 +1713,6 @@ png_colorspace_set_chromaticities(png_const_structrp png_ptr,
*/
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_error(png_ptr, "internal error checking chromaticities");
break;
}
return 0; /* failed */
@ -1730,7 +1740,6 @@ png_colorspace_set_endpoints(png_const_structrp png_ptr,
default:
colorspace->flags |= PNG_COLORSPACE_INVALID;
png_error(png_ptr, "internal error checking chromaticities");
break;
}
return 0; /* failed */
@ -2056,8 +2065,8 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
temp = png_get_uint_32(profile+12); /* profile/device class */
switch (temp)
{
case 0x73636E72: /* 'scnr' */
case 0x6D6E7472: /* 'mntr' */
case 0x73636e72: /* 'scnr' */
case 0x6d6e7472: /* 'mntr' */
case 0x70727472: /* 'prtr' */
case 0x73706163: /* 'spac' */
/* All supported */
@ -2068,7 +2077,7 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"invalid embedded Abstract ICC profile");
case 0x6C696E6B: /* 'link' */
case 0x6c696e6b: /* 'link' */
/* DeviceLink profiles cannot be interpreted in a non-device specific
* fashion, if an app uses the AToB0Tag in the profile the results are
* undefined unless the result is sent to the intended device,
@ -2078,7 +2087,7 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
return png_icc_profile_error(png_ptr, colorspace, name, temp,
"unexpected DeviceLink ICC profile class");
case 0x6E6D636C: /* 'nmcl' */
case 0x6e6d636c: /* 'nmcl' */
/* A NamedColor profile is also device specific, however it doesn't
* contain an AToB0 tag that is open to misinterpretation. Almost
* certainly it will fail the tests below.
@ -2104,8 +2113,8 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
temp = png_get_uint_32(profile+20);
switch (temp)
{
case 0x58595A20: /* 'XYZ ' */
case 0x4C616220: /* 'Lab ' */
case 0x58595a20: /* 'XYZ ' */
case 0x4c616220: /* 'Lab ' */
break;
default:
@ -2275,8 +2284,8 @@ png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
}
/* Length *and* intent must match */
if (length == png_sRGB_checks[i].length &&
intent == png_sRGB_checks[i].intent)
if (length == (png_uint_32) png_sRGB_checks[i].length &&
intent == (png_uint_32) png_sRGB_checks[i].intent)
{
/* Now calculate the adler32 if not done already. */
if (adler == 0)
@ -2335,7 +2344,7 @@ png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
* Fall through to "no match".
*/
png_chunk_report(png_ptr,
"Not recognizing known sRGB profile that has been edited",
"Not recognizing known sRGB profile that has been edited",
PNG_CHUNK_WARNING);
break;
# endif
@ -2843,7 +2852,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
if (fp >= DBL_MIN && fp <= DBL_MAX)
{
int exp_b10; /* A base 10 exponent */
int exp_b10; /* A base 10 exponent */
double base; /* 10^exp_b10 */
/* First extract a base 10 exponent of the number,
@ -2891,7 +2900,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
*/
{
int czero, clead, cdigits;
unsigned int czero, clead, cdigits;
char exponent[10];
/* Allow up to two leading zeros - this will not lengthen
@ -2921,7 +2930,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
* of the loop don't break the number into parts so
* that the final digit is rounded.
*/
if (cdigits+czero-clead+1 < (int)precision)
if (cdigits+czero+1 < precision+clead)
fp = modf(fp, &d);
else
@ -3027,7 +3036,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
*ascii++ = (char)(48 + (int)d), ++cdigits;
}
}
while (cdigits+czero-clead < (int)precision && fp > DBL_MIN);
while (cdigits+czero < precision+clead && fp > DBL_MIN);
/* The total output count (max) is now 4+precision */
@ -3095,7 +3104,7 @@ png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
/* Need another size check here for the exponent digits, so
* this need not be considered above.
*/
if ((int)size > cdigits)
if (size > cdigits)
{
while (cdigits > 0) *ascii++ = exponent[--cdigits];
@ -3143,7 +3152,7 @@ png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii,
/* Avoid overflow here on the minimum integer. */
if (fp < 0)
*ascii++ = 45, --size, num = -fp;
*ascii++ = 45, num = -fp;
else
num = fp;
@ -3674,7 +3683,7 @@ png_exp(png_fixed_point x)
if (x > 0 && x <= 0xfffff) /* Else overflow or zero (underflow) */
{
/* Obtain a 4-bit approximation */
png_uint_32 e = png_32bit_exp[(x >> 12) & 0xf];
png_uint_32 e = png_32bit_exp[(x >> 12) & 0x0f];
/* Incorporate the low 12 bits - these decrease the returned value by
* multiplying by a number less than 1 if the bit is set. The multiplier
@ -4236,7 +4245,7 @@ png_set_option(png_structrp png_ptr, int option, int onoff)
* contrib/tools/makesRGB.c. The actual sRGB transfer curve defined in the
* specification (see the article at http://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 sRGB to linear table is exact (to the nearest 16-bit linear fraction).
* The inverse (linear to sRGB) table has accuracies as follows:
*
* For all possible (255*65535+1) input values:

574
thirdparty/libpng/png.h vendored
View File

@ -1,9 +1,9 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.6.17, March 26, 2015
* libpng version 1.6.21, January 15, 2016
*
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2016 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.)
*
@ -11,17 +11,137 @@
*
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.6.17, March 26, 2015: Glenn
* libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.6.21, January 15, 2016:
* Glenn Randers-Pehrson.
* See also "Contributing Authors", below.
*/
/*
* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
*
* Note about libpng version numbers:
* If you modify libpng you may insert additional notices immediately following
* this sentence.
*
* Due to various miscommunications, unforeseen code incompatibilities
* and occasional factors outside the authors' control, version numbering
* on the library has not always been consistent and straightforward.
* The following table summarizes matters since version 0.89c, which was
* the first widely used release:
* This code is released under the libpng license.
*
* libpng versions 1.0.7, July 1, 2000, through 1.6.21, January 15, 2016, are
* Copyright (c) 2000-2002, 2004, 2006-2016 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
* added to the list of Contributing Authors:
*
* Simon-Pierre Cadieux
* Eric S. Raymond
* Mans Rullgard
* Cosmin Truta
* Gilles Vollant
* James Yu
*
* and with the following additions to the disclaimer:
*
* There is no warranty against interference with your enjoyment of the
* library or against infringement. There is no warranty that our
* efforts or the library will fulfill any of your particular purposes
* or needs. This library is provided with all faults, and the entire
* risk of satisfactory quality, performance, accuracy, and effort is with
* the user.
*
* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
* Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
* libpng-0.96, and are distributed according to the same disclaimer and
* license as libpng-0.96, with the following individuals added to the list
* of Contributing Authors:
*
* Tom Lane
* Glenn Randers-Pehrson
* Willem van Schaik
*
* libpng versions 0.89, June 1996, through 0.96, May 1997, are
* Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
* and are distributed according to the same disclaimer and license as
* libpng-0.88, with the following individuals added to the list of
* Contributing Authors:
*
* John Bowler
* Kevin Bracey
* Sam Bushell
* Magnus Holmgren
* Greg Roelofs
* Tom Tanner
*
* libpng versions 0.5, May 1995, through 0.88, January 1996, are
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* For the purposes of this copyright and license, "Contributing Authors"
* is defined as the following set of individuals:
*
* Andreas Dilger
* Dave Martindale
* Guy Eric Schalnat
* Paul Schmidt
* Tim Wegner
*
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
* and Group 42, Inc. disclaim all warranties, expressed or implied,
* including, without limitation, the warranties of merchantability and of
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
* assume no liability for direct, indirect, incidental, special, exemplary,
* or consequential damages, which may result from the use of the PNG
* Reference Library, even if advised of the possibility of such damage.
*
* Permission is hereby granted to use, copy, modify, and distribute this
* source code, or portions hereof, for any purpose, without fee, subject
* to the following restrictions:
*
* 1. The origin of this source code must not be misrepresented.
*
* 2. Altered versions must be plainly marked as such and must not
* be misrepresented as being the original source.
*
* 3. This Copyright notice may not be removed or altered from any
* source or altered source distribution.
*
* The Contributing Authors and Group 42, Inc. specifically permit, without
* fee, and encourage the use of this source code as a component to
* supporting the PNG file format in commercial products. If you use this
* source code in a product, acknowledgment is not required but would be
* appreciated.
*
* END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
*/
/*
* A "png_get_copyright" function is available, for convenient use in "about"
* boxes and the like:
*
* printf("%s", png_get_copyright(NULL));
*
* Also, the PNG logo (in PNG format, of course) is supplied in the
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
*/
/*
* Libpng is OSI Certified Open Source Software. OSI Certified Open Source is
* a certification mark of the Open Source Initiative. OSI has not addressed
* the additional disclaimers inserted at version 1.0.7.
*/
/*
* The contributing authors would like to thank all those who helped
* with testing, bug fixes, and patience. This wouldn't have been
* possible without all of you.
*
* Thanks to Frank J. T. Wojcik for helping with the documentation.
*/
/* Note about libpng version numbers:
*
* Due to various miscommunications, unforeseen code incompatibilities
* and occasional factors outside the authors' control, version numbering
* on the library has not always been consistent and straightforward.
* The following table summarizes matters since version 0.89c, which was
* the first widely used release:
*
* source png.h png.h shared-lib
* version string int version
@ -59,313 +179,48 @@
* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
* 1.0.7 1 10007 (still compatible)
* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
* 1.0.8rc1 1 10008 2.1.0.8rc1
* 1.0.8 1 10008 2.1.0.8
* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
* 1.0.9rc1 1 10009 2.1.0.9rc1
* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
* 1.0.9rc2 1 10009 2.1.0.9rc2
* 1.0.9 1 10009 2.1.0.9
* 1.0.10beta1 1 10010 2.1.0.10beta1
* 1.0.10rc1 1 10010 2.1.0.10rc1
* 1.0.10 1 10010 2.1.0.10
* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
* 1.0.11rc1 1 10011 2.1.0.11rc1
* 1.0.11 1 10011 2.1.0.11
* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
* 1.0.12rc1 2 10012 2.1.0.12rc1
* 1.0.12 2 10012 2.1.0.12
* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
* 1.2.0rc1 3 10200 3.1.2.0rc1
* 1.2.0 3 10200 3.1.2.0
* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
* 1.2.1 3 10201 3.1.2.1
* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
* 1.0.13 10 10013 10.so.0.1.0.13
* 1.2.2 12 10202 12.so.0.1.2.2
* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
* 1.2.3 12 10203 12.so.0.1.2.3
* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
* 1.0.14 10 10014 10.so.0.1.0.14
* 1.2.4 13 10204 12.so.0.1.2.4
* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
* 1.0.15 10 10015 10.so.0.1.0.15
* 1.2.5 13 10205 12.so.0.1.2.5
* 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
* 1.0.16 10 10016 10.so.0.1.0.16
* 1.2.6 13 10206 12.so.0.1.2.6
* 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
* 1.0.17rc1 10 10017 12.so.0.1.0.17rc1
* 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
* 1.0.17 10 10017 12.so.0.1.0.17
* 1.2.7 13 10207 12.so.0.1.2.7
* 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
* 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5
* 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
* 1.0.18 10 10018 12.so.0.1.0.18
* 1.2.8 13 10208 12.so.0.1.2.8
* 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
* 1.2.9beta4-11 13 10209 12.so.0.9[.0]
* 1.2.9rc1 13 10209 12.so.0.9[.0]
* 1.2.9 13 10209 12.so.0.9[.0]
* 1.2.10beta1-7 13 10210 12.so.0.10[.0]
* 1.2.10rc1-2 13 10210 12.so.0.10[.0]
* 1.2.10 13 10210 12.so.0.10[.0]
* 1.4.0beta1-5 14 10400 14.so.0.0[.0]
* 1.2.11beta1-4 13 10211 12.so.0.11[.0]
* 1.4.0beta7-8 14 10400 14.so.0.0[.0]
* 1.2.11 13 10211 12.so.0.11[.0]
* 1.2.12 13 10212 12.so.0.12[.0]
* 1.4.0beta9-14 14 10400 14.so.0.0[.0]
* 1.2.13 13 10213 12.so.0.13[.0]
* 1.4.0beta15-36 14 10400 14.so.0.0[.0]
* 1.4.0beta37-87 14 10400 14.so.14.0[.0]
* 1.4.0rc01 14 10400 14.so.14.0[.0]
* 1.4.0beta88-109 14 10400 14.so.14.0[.0]
* 1.4.0rc02-08 14 10400 14.so.14.0[.0]
* 1.4.0 14 10400 14.so.14.0[.0]
* 1.4.1beta01-03 14 10401 14.so.14.1[.0]
* 1.4.1rc01 14 10401 14.so.14.1[.0]
* 1.4.1beta04-12 14 10401 14.so.14.1[.0]
* 1.4.1 14 10401 14.so.14.1[.0]
* 1.4.2 14 10402 14.so.14.2[.0]
* 1.4.3 14 10403 14.so.14.3[.0]
* 1.4.4 14 10404 14.so.14.4[.0]
* 1.5.0beta01-58 15 10500 15.so.15.0[.0]
* 1.5.0rc01-07 15 10500 15.so.15.0[.0]
* 1.5.0 15 10500 15.so.15.0[.0]
* 1.5.1beta01-11 15 10501 15.so.15.1[.0]
* 1.5.1rc01-02 15 10501 15.so.15.1[.0]
* 1.5.1 15 10501 15.so.15.1[.0]
* 1.5.2beta01-03 15 10502 15.so.15.2[.0]
* 1.5.2rc01-03 15 10502 15.so.15.2[.0]
* 1.5.2 15 10502 15.so.15.2[.0]
* 1.5.3beta01-10 15 10503 15.so.15.3[.0]
* 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]
* 1.5.4beta01-08 15 10504 15.so.15.4[.0]
* 1.5.4rc01 15 10504 15.so.15.4[.0]
* 1.5.4 15 10504 15.so.15.4[.0]
* 1.5.5beta01-08 15 10505 15.so.15.5[.0]
* 1.5.5rc01 15 10505 15.so.15.5[.0]
* 1.5.5 15 10505 15.so.15.5[.0]
* 1.5.6beta01-07 15 10506 15.so.15.6[.0]
* 1.5.6rc01-03 15 10506 15.so.15.6[.0]
* 1.5.6 15 10506 15.so.15.6[.0]
* 1.5.7beta01-05 15 10507 15.so.15.7[.0]
* 1.5.7rc01-03 15 10507 15.so.15.7[.0]
* 1.5.7 15 10507 15.so.15.7[.0]
* 1.6.0beta01-40 16 10600 16.so.16.0[.0]
* 1.6.0rc01-08 16 10600 16.so.16.0[.0]
* 1.6.0 16 10600 16.so.16.0[.0]
* 1.6.1beta01-09 16 10601 16.so.16.1[.0]
* 1.6.1rc01 16 10601 16.so.16.1[.0]
* 1.6.1 16 10601 16.so.16.1[.0]
* 1.6.2beta01 16 10602 16.so.16.2[.0]
* 1.6.2rc01-06 16 10602 16.so.16.2[.0]
* 1.6.2 16 10602 16.so.16.2[.0]
* 1.6.3beta01-11 16 10603 16.so.16.3[.0]
* 1.6.3rc01 16 10603 16.so.16.3[.0]
* 1.6.3 16 10603 16.so.16.3[.0]
* 1.6.4beta01-02 16 10604 16.so.16.4[.0]
* 1.6.4rc01 16 10604 16.so.16.4[.0]
* 1.6.4 16 10604 16.so.16.4[.0]
* 1.6.5 16 10605 16.so.16.5[.0]
* 1.6.6 16 10606 16.so.16.6[.0]
* 1.6.7beta01-04 16 10607 16.so.16.7[.0]
* 1.6.7rc01-03 16 10607 16.so.16.7[.0]
* 1.6.7 16 10607 16.so.16.7[.0]
* 1.6.8beta01-02 16 10608 16.so.16.8[.0]
* 1.6.8rc01-02 16 10608 16.so.16.8[.0]
* 1.6.8 16 10608 16.so.16.8[.0]
* 1.6.9beta01-04 16 10609 16.so.16.9[.0]
* 1.6.9rc01-02 16 10609 16.so.16.9[.0]
* 1.6.9 16 10609 16.so.16.9[.0]
* 1.6.10beta01-03 16 10610 16.so.16.10[.0]
* 1.6.10rc01-03 16 10610 16.so.16.10[.0]
* 1.6.10 16 10610 16.so.16.10[.0]
* 1.6.11beta01-06 16 10611 16.so.16.11[.0]
* 1.6.11rc01-02 16 10611 16.so.16.11[.0]
* 1.6.11 16 10611 16.so.16.11[.0]
* 1.6.12rc01-03 16 10612 16.so.16.12[.0]
* 1.6.12 16 10612 16.so.16.12[.0]
* 1.6.13beta01-04 16 10613 16.so.16.13[.0]
* 1.6.13rc01-02 16 10613 16.so.16.13[.0]
* 1.6.13 16 10613 16.so.16.13[.0]
* 1.6.14beta01-07 16 10614 16.so.16.14[.0]
* 1.6.14rc01-02 16 10614 16.so.16.14[.0]
* 1.6.14 16 10614 16.so.16.14[.0]
* 1.6.15beta01-08 16 10615 16.so.16.15[.0]
* 1.6.15rc01-03 16 10615 16.so.16.15[.0]
* 1.6.15 16 10615 16.so.16.15[.0]
* 1.6.16beta01-03 16 10616 16.so.16.16[.0]
* 1.6.16rc01-02 16 10616 16.so.16.16[.0]
* 1.6.16 16 10616 16.so.16.16[.0]
* 1.6.17beta01-06 16 10617 16.so.16.17[.0]
* 1.6.17rc01-06 16 10617 16.so.16.17[.0]
* 1.6.17 16 10617 16.so.16.17[.0]
* ...
* 1.0.19 10 10019 10.so.0.19[.0]
* ...
* 1.2.53 13 10253 12.so.0.53[.0]
* ...
* 1.5.23 15 10523 15.so.15.23[.0]
* ...
* 1.6.21 16 10621 16.so.16.21[.0]
*
* Henceforth the source version will match the shared-library major
* and minor numbers; the shared-library major version number will be
* used for changes in backward compatibility, as it is intended. The
* PNG_LIBPNG_VER macro, which is not used within libpng but is available
* for applications, is an unsigned integer of the form xyyzz corresponding
* to the source version x.y.z (leading zeros in y and z). Beta versions
* were given the previous public release number plus a letter, until
* version 1.0.6j; from then on they were given the upcoming public
* release number plus "betaNN" or "rcNN".
* Henceforth the source version will match the shared-library major
* and minor numbers; the shared-library major version number will be
* used for changes in backward compatibility, as it is intended. The
* PNG_LIBPNG_VER macro, which is not used within libpng but is available
* for applications, is an unsigned integer of the form xyyzz corresponding
* to the source version x.y.z (leading zeros in y and z). Beta versions
* were given the previous public release number plus a letter, until
* version 1.0.6j; from then on they were given the upcoming public
* release number plus "betaNN" or "rcNN".
*
* Binary incompatibility exists only when applications make direct access
* to the info_ptr or png_ptr members through png.h, and the compiled
* application is loaded with a different version of the library.
* Binary incompatibility exists only when applications make direct access
* to the info_ptr or png_ptr members through png.h, and the compiled
* application is loaded with a different version of the library.
*
* DLLNUM will change each time there are forward or backward changes
* in binary compatibility (e.g., when a new feature is added).
* DLLNUM will change each time there are forward or backward changes
* in binary compatibility (e.g., when a new feature is added).
*
* See libpng-manual.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/
*/
/*
* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
*
* If you modify libpng you may insert additional notices immediately following
* this sentence.
*
* This code is released under the libpng license.
*
* libpng versions 1.2.6, August 15, 2004, through 1.6.17, March 26, 2015, are
* Copyright (c) 2004, 2006-2015 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:
*
* Cosmin Truta
*
* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
* distributed according to the same disclaimer and license as libpng-1.0.6
* with the following individuals added to the list of Contributing Authors:
*
* Simon-Pierre Cadieux
* Eric S. Raymond
* Gilles Vollant
*
* and with the following additions to the disclaimer:
*
* There is no warranty against interference with your enjoyment of the
* library or against infringement. There is no warranty that our
* efforts or the library will fulfill any of your particular purposes
* or needs. This library is provided with all faults, and the entire
* risk of satisfactory quality, performance, accuracy, and effort is with
* the user.
*
* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
* distributed according to the same disclaimer and license as libpng-0.96,
* with the following individuals added to the list of Contributing Authors:
*
* Tom Lane
* Glenn Randers-Pehrson
* Willem van Schaik
*
* libpng versions 0.89, June 1996, through 0.96, May 1997, are
* Copyright (c) 1996, 1997 Andreas Dilger
* Distributed according to the same disclaimer and license as libpng-0.88,
* with the following individuals added to the list of Contributing Authors:
*
* John Bowler
* Kevin Bracey
* Sam Bushell
* Magnus Holmgren
* Greg Roelofs
* Tom Tanner
*
* libpng versions 0.5, May 1995, through 0.88, January 1996, are
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
*
* For the purposes of this copyright and license, "Contributing Authors"
* is defined as the following set of individuals:
*
* Andreas Dilger
* Dave Martindale
* Guy Eric Schalnat
* Paul Schmidt
* Tim Wegner
*
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
* and Group 42, Inc. disclaim all warranties, expressed or implied,
* including, without limitation, the warranties of merchantability and of
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
* assume no liability for direct, indirect, incidental, special, exemplary,
* or consequential damages, which may result from the use of the PNG
* Reference Library, even if advised of the possibility of such damage.
*
* Permission is hereby granted to use, copy, modify, and distribute this
* source code, or portions hereof, for any purpose, without fee, subject
* to the following restrictions:
*
* 1. The origin of this source code must not be misrepresented.
*
* 2. Altered versions must be plainly marked as such and must not
* be misrepresented as being the original source.
*
* 3. This Copyright notice may not be removed or altered from
* any source or altered source distribution.
*
* The Contributing Authors and Group 42, Inc. specifically permit, without
* fee, and encourage the use of this source code as a component to
* supporting the PNG file format in commercial products. If you use this
* source code in a product, acknowledgment is not required but would be
* appreciated.
*/
/*
* A "png_get_copyright" function is available, for convenient use in "about"
* boxes and the like:
*
* printf("%s", png_get_copyright(NULL));
*
* Also, the PNG logo (in PNG format, of course) is supplied in the
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
*/
/*
* Libpng is OSI Certified Open Source Software. OSI Certified is a
* certification mark of the Open Source Initiative.
*/
/*
* The contributing authors would like to thank all those who helped
* with testing, bug fixes, and patience. This wouldn't have been
* possible without all of you.
*
* Thanks to Frank J. T. Wojcik for helping with the documentation.
* 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/
*/
/*
* Y2K compliance in libpng:
* =========================
*
* March 26, 2015
* January 15, 2016
*
* 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 1.6.17 are Y2K compliant. It is my belief that
* upward through 1.6.21 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
@ -427,9 +282,9 @@
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.6.17"
#define PNG_LIBPNG_VER_STRING "1.6.21"
#define PNG_HEADER_VERSION_STRING \
" libpng version 1.6.17 - March 26, 2015\n"
" libpng version 1.6.21 - January 15, 2016\n"
#define PNG_LIBPNG_VER_SONUM 16
#define PNG_LIBPNG_VER_DLLNUM 16
@ -437,7 +292,7 @@
/* 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 17
#define PNG_LIBPNG_VER_RELEASE 21
/* This should match the numeric part of the final component of
* PNG_LIBPNG_VER_STRING, omitting any leading zero:
@ -468,7 +323,7 @@
* 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 10617 /* 1.6.17 */
#define PNG_LIBPNG_VER 10621 /* 1.6.21 */
/* Library configuration: these options cannot be changed after
* the library has been built.
@ -525,17 +380,22 @@ extern "C" {
/* This file is arranged in several sections:
*
* 1. Any configuration options that can be specified by for the application
* 1. [omitted]
* 2. Any configuration options that can be specified by for the application
* code when it is built. (Build time configuration is in pnglibconf.h)
* 2. Type definitions (base types are defined in pngconf.h), structure
* 3. Type definitions (base types are defined in pngconf.h), structure
* definitions.
* 3. Exported library functions.
* 4. Simplified API.
* 4. Exported library functions.
* 5. Simplified API.
* 6. Implementation options.
*
* The library source code has additional files (principally pngpriv.h) that
* allow configuration of the library.
*/
/* Section 1: run time configuration
/* Section 1: [omitted] */
/* Section 2: run time configuration
* See pnglibconf.h for build time configuration
*
* Run time configuration allows the application to choose between
@ -565,7 +425,7 @@ extern "C" {
* Otherwise the calls are mapped to png_error.
*/
/* Section 2: type definitions, including structures and compile time
/* Section 3: type definitions, including structures and compile time
* constants.
* See pngconf.h for base types that vary by machine/system
*/
@ -573,7 +433,7 @@ 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_17;
typedef char* png_libpng_version_1_6_21;
/* Basic control structions. Read libpng-manual.txt or libpng.3 for more info.
*
@ -889,7 +749,9 @@ typedef png_unknown_chunk * * png_unknown_chunkpp;
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
#if INT_MAX >= 0x8000 /* else this might break */
#define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */
#endif
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
@ -993,7 +855,9 @@ PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
/* Added to libpng-1.5.4 */
#define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */
#if INT_MAX >= 0x8000 /* else this might break */
#define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */
#endif
/* Flags for MNG supported features */
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
@ -1010,7 +874,7 @@ typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
png_alloc_size_t));
typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
/* Section 3: exported functions
/* Section 4: exported functions
* Here are the function definitions most commonly used. This is not
* the place to find out how to use libpng. See libpng-manual.txt for the
* full explanation, see example.c for the summary. This just provides
@ -1383,13 +1247,13 @@ PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr));
#endif
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
/* Add a filler byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */
PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler,
int flags));
/* The values of the PNG_FILLER_ defines should NOT be changed */
# define PNG_FILLER_BEFORE 0
# define PNG_FILLER_AFTER 1
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
/* Add an alpha byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */
PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr,
png_uint_32 filler, int flags));
#endif /* READ_FILLER || WRITE_FILLER */
@ -1623,35 +1487,7 @@ PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method,
#define PNG_FILTER_VALUE_LAST 5
#ifdef PNG_WRITE_SUPPORTED
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
* defines, either the default (minimum-sum-of-absolute-differences), or
* the experimental method (weighted-minimum-sum-of-absolute-differences).
*
* Weights are factors >= 1.0, indicating how important it is to keep the
* filter type consistent between rows. Larger numbers mean the current
* filter is that many times as likely to be the same as the "num_weights"
* previous filters. This is cumulative for each previous row with a weight.
* There needs to be "num_weights" values in "filter_weights", or it can be
* NULL if the weights aren't being specified. Weights have no influence on
* the selection of the first row filter. Well chosen weights can (in theory)
* improve the compression for a given image.
*
* Costs are factors >= 1.0 indicating the relative decoding costs of a
* filter type. Higher costs indicate more decoding expense, and are
* therefore less likely to be selected over a filter with lower computational
* costs. There needs to be a value in "filter_costs" for each valid filter
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
* setting the costs. Costs try to improve the speed of decompression without
* unduly increasing the compressed image size.
*
* A negative weight or cost indicates the default value is to be used, and
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
* The default values for both weights and costs are currently 1.0, but may
* change if good general weighting/cost heuristics can be found. If both
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
* to the UNWEIGHTED method, but with added encoding time/computation.
*/
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */
PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr,
int heuristic_method, int num_weights, png_const_doublep filter_weights,
png_const_doublep filter_costs))
@ -1661,9 +1497,7 @@ PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,
png_const_fixed_point_p filter_costs))
#endif /* WRITE_WEIGHTED_FILTER */
/* Heuristic used for row filter selection. These defines should NOT be
* changed.
*/
/* The following are no longer used and will be removed from libpng-1.7: */
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
@ -2744,7 +2578,7 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
# define PNG_get_int_32(buf) \
((png_int_32)((*(buf) & 0x80) \
? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
? -((png_int_32)(((png_get_uint_32(buf)^0xffffffffU)+1U)&0x7fffffffU)) \
: (png_int_32)png_get_uint_32(buf)))
/* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h,
@ -2764,10 +2598,17 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
# endif
#endif
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) || \
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
PNG_EXPORT(242, void, png_set_check_for_invalid_index,
(png_structrp png_ptr, int allowed));
# ifdef PNG_GET_PALETTE_MAX_SUPPORTED
PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr,
png_const_infop info_ptr));
# endif
#endif /* CHECK_FOR_INVALID_INDEX */
/*******************************************************************************
* SIMPLIFIED API
* Section 5: SIMPLIFIED API
*******************************************************************************
*
* Please read the documentation in libpng-manual.txt (TODO: write said
@ -2783,8 +2624,9 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
*
* To read a PNG file using the simplified API:
*
* 1) Declare a 'png_image' structure (see below) on the stack and set the
* version field to PNG_IMAGE_VERSION.
* 1) Declare a 'png_image' structure (see below) on the stack, set the
* version field to PNG_IMAGE_VERSION and the 'opaque' pointer to NULL
* (this is REQUIRED, your program may crash if you don't do it.)
* 2) Call the appropriate png_image_begin_read... function.
* 3) Set the png_image 'format' member to the required sample format.
* 4) Allocate a buffer for the image and, if required, the color-map.
@ -2811,6 +2653,9 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
* when it is being read or defines the in-memory format of an image that you
* need to write:
*/
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) || \
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
#define PNG_IMAGE_VERSION 1
typedef struct png_control *png_controlp;
@ -2910,7 +2755,7 @@ typedef struct
* called to read or write the color-map and set the format correctly for the
* image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly!
*
* NOTE: libpng can be built with particular features disabled, if you see
* NOTE: libpng can be built with particular features disabled. If you see
* compiler errors because the definition of one of the following flags has been
* compiled out it is because libpng does not have the required support. It is
* possible, however, for the libpng configuration to enable the format on just
@ -2922,7 +2767,7 @@ typedef struct
*/
#define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */
#define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */
#define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */
#define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2-byte channels else 1-byte */
#define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */
#ifdef PNG_FORMAT_BGR_SUPPORTED
@ -3209,9 +3054,11 @@ PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file,
*
* With all APIs row_stride is handled as in the read APIs - it is the spacing
* from one row to the next in component sized units (1 or 2 bytes) and if
* negative indicates a bottom-up row layout in the buffer.
* negative indicates a bottom-up row layout in the buffer. If row_stride is zero,
* libpng will calculate it for you from the image width and number of channels.
*
* Note that the write API does not support interlacing or sub-8-bit pixels.
* Note that the write API does not support interlacing, sub-8-bit pixels, indexed
* PNG (color_type 3) or most ancillary chunks.
*/
#endif /* STDIO */
#endif /* SIMPLIFIED_WRITE */
@ -3220,17 +3067,8 @@ PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file,
******************************************************************************/
#endif /* SIMPLIFIED_{READ|WRITE} */
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
PNG_EXPORT(242, void, png_set_check_for_invalid_index,
(png_structrp png_ptr, int allowed));
# ifdef PNG_GET_PALETTE_MAX_SUPPORTED
PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr,
png_const_infop info_ptr));
# endif
#endif /* CHECK_FOR_INVALID_INDEX */
/*******************************************************************************
* IMPLEMENTATION OPTIONS
* Section 6: IMPLEMENTATION OPTIONS
*******************************************************************************
*
* Support for arbitrary implementation-specific optimizations. The API allows

26
thirdparty/libpng/pngconf.h vendored
View File

@ -1,9 +1,9 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng version 1.6.17, March 26, 2015
* libpng version 1.6.21, January 15, 2016
*
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -63,7 +63,7 @@
*/
#define PNG_CONST const /* backward compatibility only */
/* This controls optimization of the reading of 16 and 32 bit values
/* This controls optimization of the reading of 16-bit and 32-bit values
* from PNG files. It can be set on a per-app-file basis - it
* just changes whether a macro is used when the function is called.
* The library builder sets the default; if read functions are not
@ -295,11 +295,11 @@
* table entries, so we discard it here. See the .dfn files in the
* scripts directory.
*/
#ifndef PNG_EXPORTA
# define PNG_EXPORTA(ordinal, type, name, args, attributes)\
PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
extern attributes)
#ifndef PNG_EXPORTA
# define PNG_EXPORTA(ordinal, type, name, args, attributes) \
PNG_FUNCTION(PNG_EXPORT_TYPE(type), (PNGAPI name), PNGARG(args), \
PNG_LINKAGE_API attributes)
#endif
/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
@ -307,7 +307,7 @@
*/
#define PNG_EMPTY /*empty list*/
#define PNG_EXPORT(ordinal, type, name, args)\
#define PNG_EXPORT(ordinal, type, name, args) \
PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
/* Use PNG_REMOVED to comment out a removed interface. */
@ -480,7 +480,7 @@
#if CHAR_BIT == 8 && UCHAR_MAX == 255
typedef unsigned char png_byte;
#else
# error "libpng requires 8 bit bytes"
# error "libpng requires 8-bit bytes"
#endif
#if INT_MIN == -32768 && INT_MAX == 32767
@ -488,7 +488,7 @@
#elif SHRT_MIN == -32768 && SHRT_MAX == 32767
typedef short png_int_16;
#else
# error "libpng requires a signed 16 bit type"
# error "libpng requires a signed 16-bit type"
#endif
#if UINT_MAX == 65535
@ -496,7 +496,7 @@
#elif USHRT_MAX == 65535
typedef unsigned short png_uint_16;
#else
# error "libpng requires an unsigned 16 bit type"
# error "libpng requires an unsigned 16-bit type"
#endif
#if INT_MIN < -2147483646 && INT_MAX > 2147483646
@ -504,7 +504,7 @@
#elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
typedef long int png_int_32;
#else
# error "libpng requires a signed 32 bit (or more) type"
# error "libpng requires a signed 32-bit (or more) type"
#endif
#if UINT_MAX > 4294967294
@ -512,7 +512,7 @@
#elif ULONG_MAX > 4294967294
typedef unsigned long int png_uint_32;
#else
# error "libpng requires an unsigned 32 bit (or more) type"
# error "libpng requires an unsigned 32-bit (or more) type"
#endif
/* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,

2
thirdparty/libpng/pngdebug.h vendored
View File

@ -2,7 +2,7 @@
/* pngdebug.h - Debugging macros for libpng, also used in pngtest.c
*
* Last changed in libpng 1.6.8 [December 19, 2013]
* Copyright (c) 1998-2013 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2013 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.)
*

4
thirdparty/libpng/pngerror.c vendored
View File

@ -2,7 +2,7 @@
/* pngerror.c - stub functions for i/o and memory allocation
*
* Last changed in libpng 1.6.15 [November 20, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2014 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.)
*
@ -768,7 +768,7 @@ png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN)
/* If control reaches this point, png_longjmp() must not return. The only
* choice is to terminate the whole process (or maybe the thread); to do
* this the ANSI-C abort() function is used unless a different method is
* this the ANSI-C abort() function is used unless a different method is
* implemented by overriding the default configuration setting for
* PNG_ABORT().
*/

2
thirdparty/libpng/pngget.c vendored
View File

@ -2,7 +2,7 @@
/* pngget.c - retrieval of values from info struct
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*

4
thirdparty/libpng/pnginfo.h vendored
View File

@ -2,7 +2,7 @@
/* pnginfo.h - header file for PNG reference library
*
* Last changed in libpng 1.6.1 [March 28, 2013]
* Copyright (c) 1998-2013 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2013 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.)
*
@ -223,7 +223,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
/* Storage for unknown chunks that the library doesn't recognize. */
png_unknown_chunkp unknown_chunks;
/* The type of this field is limited by the type of
/* The type of this field is limited by the type of
* png_struct::user_chunk_cache_max, else overflow can occur.
*/
int unknown_chunks_num;

5
thirdparty/libpng/pngmem.c vendored
View File

@ -2,7 +2,7 @@
/* pngmem.c - stub functions for memory allocation
*
* Last changed in libpng 1.6.15 [November 20, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2014 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.)
*
@ -77,6 +77,9 @@ png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size),
PNG_UNUSED(png_ptr)
#endif
/* Some compilers complain that this is always true. However, it
* can be false when integer overflow happens.
*/
if (size > 0 && size <= PNG_SIZE_MAX
# ifdef PNG_MAX_MALLOC_64K
&& size <= 65536U

119
thirdparty/libpng/pngpread.c vendored
View File

@ -1,8 +1,8 @@
/* pngpread.c - read a png file in push mode
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.18 [July 23, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -19,7 +19,6 @@
#define PNG_READ_SIG_MODE 0
#define PNG_READ_CHUNK_MODE 1
#define PNG_READ_IDAT_MODE 2
#define PNG_SKIP_MODE 3
#define PNG_READ_tEXt_MODE 4
#define PNG_READ_zTXt_MODE 5
#define PNG_READ_DONE_MODE 6
@ -78,32 +77,14 @@ png_process_data_pause(png_structrp png_ptr, int save)
png_uint_32 PNGAPI
png_process_data_skip(png_structrp png_ptr)
{
png_uint_32 remaining = 0;
if (png_ptr != NULL && png_ptr->process_mode == PNG_SKIP_MODE &&
png_ptr->skip_length > 0)
{
/* At the end of png_process_data the buffer size must be 0 (see the loop
* above) so we can detect a broken call here:
*/
if (png_ptr->buffer_size != 0)
png_error(png_ptr,
"png_process_data_skip called inside png_process_data");
/* If is impossible for there to be a saved buffer at this point -
* otherwise we could not be in SKIP mode. This will also happen if
* png_process_skip is called inside png_process_data (but only very
* rarely.)
*/
if (png_ptr->save_buffer_size != 0)
png_error(png_ptr, "png_process_data_skip called with saved data");
remaining = png_ptr->skip_length;
png_ptr->skip_length = 0;
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
}
return remaining;
/* TODO: Deprecate and remove this API.
* Somewhere the implementation of this seems to have been lost,
* or abandoned. It was only to support some internal back-door access
* to png_struct) in libpng-1.4.x.
*/
png_app_warning(png_ptr,
"png_process_data_skip is not implemented in any current version of libpng");
return 0;
}
/* What we do with the incoming data depends on what we were previously
@ -135,12 +116,6 @@ png_process_some_data(png_structrp png_ptr, png_inforp info_ptr)
break;
}
case PNG_SKIP_MODE:
{
png_push_crc_finish(png_ptr);
break;
}
default:
{
png_ptr->buffer_size = 0;
@ -158,8 +133,8 @@ png_process_some_data(png_structrp png_ptr, png_inforp info_ptr)
void /* PRIVATE */
png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr)
{
png_size_t num_checked = png_ptr->sig_bytes, /* SAFE, does not exceed 8 */
num_to_check = 8 - num_checked;
png_size_t num_checked = png_ptr->sig_bytes, /* SAFE, does not exceed 8 */
num_to_check = 8 - num_checked;
if (png_ptr->buffer_size < num_to_check)
{
@ -439,69 +414,6 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
void /* PRIVATE */
png_push_crc_skip(png_structrp png_ptr, png_uint_32 skip)
{
png_ptr->process_mode = PNG_SKIP_MODE;
png_ptr->skip_length = skip;
}
void /* PRIVATE */
png_push_crc_finish(png_structrp png_ptr)
{
if (png_ptr->skip_length != 0 && png_ptr->save_buffer_size != 0)
{
png_size_t save_size = png_ptr->save_buffer_size;
png_uint_32 skip_length = png_ptr->skip_length;
/* We want the smaller of 'skip_length' and 'save_buffer_size', but
* they are of different types and we don't know which variable has the
* fewest bits. Carefully select the smaller and cast it to the type of
* the larger - this cannot overflow. Do not cast in the following test
* - it will break on either 16 or 64 bit platforms.
*/
if (skip_length < save_size)
save_size = (png_size_t)skip_length;
else
skip_length = (png_uint_32)save_size;
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
png_ptr->skip_length -= skip_length;
png_ptr->buffer_size -= save_size;
png_ptr->save_buffer_size -= save_size;
png_ptr->save_buffer_ptr += save_size;
}
if (png_ptr->skip_length != 0 && png_ptr->current_buffer_size != 0)
{
png_size_t save_size = png_ptr->current_buffer_size;
png_uint_32 skip_length = png_ptr->skip_length;
/* We want the smaller of 'skip_length' and 'current_buffer_size', here,
* the same problem exists as above and the same solution.
*/
if (skip_length < save_size)
save_size = (png_size_t)skip_length;
else
skip_length = (png_uint_32)save_size;
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
png_ptr->skip_length -= skip_length;
png_ptr->buffer_size -= save_size;
png_ptr->current_buffer_size -= save_size;
png_ptr->current_buffer_ptr += save_size;
}
if (png_ptr->skip_length == 0)
{
PNG_PUSH_SAVE_BUFFER_IF_LT(4)
png_crc_finish(png_ptr, 0);
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
}
}
void PNGCBAPI
png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
{
@ -584,13 +496,11 @@ png_push_save_buffer(png_structrp png_ptr)
if (png_ptr->save_buffer == NULL)
{
png_free(png_ptr, old_buffer);
old_buffer = NULL;
png_error(png_ptr, "Insufficient memory for save_buffer");
}
memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
png_free(png_ptr, old_buffer);
old_buffer = NULL;
png_ptr->save_buffer_max = new_max;
}
if (png_ptr->current_buffer_size)
@ -653,7 +563,7 @@ png_push_read_IDAT(png_structrp png_ptr)
* are of different types and we don't know which variable has the fewest
* bits. Carefully select the smaller and cast it to the type of the
* larger - this cannot overflow. Do not cast in the following test - it
* will break on either 16 or 64 bit platforms.
* will break on either 16-bit or 64-bit platforms.
*/
if (idat_size < save_size)
save_size = (png_size_t)idat_size;
@ -696,6 +606,7 @@ png_push_read_IDAT(png_structrp png_ptr)
png_ptr->current_buffer_size -= save_size;
png_ptr->current_buffer_ptr += save_size;
}
if (png_ptr->idat_size == 0)
{
PNG_PUSH_SAVE_BUFFER_IF_LT(4)
@ -751,7 +662,7 @@ png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer,
* change the current behavior (see comments in inflate.c
* for why this doesn't happen at present with zlib 1.2.5).
*/
ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH);
ret = PNG_INFLATE(png_ptr, Z_SYNC_FLUSH);
/* Check for any failure before proceeding. */
if (ret != Z_OK && ret != Z_STREAM_END)

58
thirdparty/libpng/pngpriv.h vendored
View File

@ -1,8 +1,8 @@
/* pngpriv.h - private declarations for use inside libpng
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.21 [January 15, 2016]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -118,8 +118,12 @@
* to compile with an appropriate #error if ALIGNED_MEMORY has been turned
* off.
*
* Note that gcc-4.9 defines __ARM_NEON instead of __ARM_NEON__, so we
* check both variants.
* Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
* __ARM_NEON__, so we check both variants.
*
* To disable ARM_NEON optimizations entirely, and skip compiling the
* associated assembler code, pass --enable-arm-neon=no to configure
* or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
*/
# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
defined(PNG_ALIGNED_MEMORY_SUPPORTED)
@ -248,17 +252,18 @@
* always be used to declare an extern data or function object in this file.
*/
#ifndef PNG_INTERNAL_DATA
# define PNG_INTERNAL_DATA(type, name, array) extern type name array
# define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
#endif
#ifndef PNG_INTERNAL_FUNCTION
# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
#endif
#ifndef PNG_INTERNAL_CALLBACK
# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes)
PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
PNG_EMPTY attributes)
#endif
/* If floating or fixed point APIs are disabled they may still be compiled
@ -296,6 +301,22 @@
# define PNG_DLL_EXPORT
#endif
/* This is a global switch to set the compilation for an installed system
* (a release build). It can be set for testing debug builds to ensure that
* they will compile when the build type is switched to RC or STABLE, the
* default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
* with either:
*
* -DPNG_RELEASE_BUILD Turns on the release compile path
* -DPNG_RELEASE_BUILD=0 Turns it off
* or in your pngusr.h with
* #define PNG_RELEASE_BUILD=1 Turns on the release compile path
* #define PNG_RELEASE_BUILD=0 Turns it off
*/
#ifndef PNG_RELEASE_BUILD
# define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
#endif
/* SECURITY and SAFETY:
*
* libpng is built with support for internal limits on image dimensions and
@ -554,10 +575,6 @@
#define PNG_STRUCT_PNG 0x0001
#define PNG_STRUCT_INFO 0x0002
/* Scaling factor for filter heuristic weighting calculations */
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
/* Flags for the png_ptr->flags rather than declaring a byte for each one */
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
@ -648,7 +665,7 @@
/* The fixed point conversion performs range checking and evaluates
* its argument multiple times, so must be used with care. The
* range checking uses the PNG specification values for a signed
* 32 bit fixed point value except that the values are deliberately
* 32-bit fixed point value except that the values are deliberately
* rounded-to-zero to an integral value - 21474 (21474.83 is roughly
* (2^31-1) * 100000). 's' is a string that describes the value being
* converted.
@ -795,7 +812,7 @@
*/
#endif
/* This is used for 16 bit gamma tables -- only the top level pointers are
/* This is used for 16-bit gamma tables -- only the top level pointers are
* const; this could be changed:
*/
typedef const png_uint_16p * png_const_uint_16pp;
@ -1198,6 +1215,14 @@ PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
/* Initialize the row buffers, etc. */
PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
#if PNG_ZLIB_VERNUM >= 0x1240
PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
PNG_EMPTY);
# define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
#else /* Zlib < 1.2.4 */
# define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
#endif /* Zlib < 1.2.4 */
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
/* Optional call to update the users info structure */
PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
@ -1372,10 +1397,6 @@ PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
png_inforp info_ptr),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
png_uint_32 length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),
PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
@ -1896,6 +1917,9 @@ PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
(png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
#endif
PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
png_const_charp key, png_bytep new_key), PNG_EMPTY);
/* Maintainer: Put new private prototypes here ^ */
#include "pngdebug.h"

34
thirdparty/libpng/pngread.c vendored
View File

@ -2,7 +2,7 @@
/* pngread.c - read a PNG file
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -63,7 +63,7 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
/* In stable builds only warn if an application error can be completely
* handled.
*/
# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC
# if PNG_RELEASE_BUILD
png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
# endif
# endif
@ -1043,9 +1043,9 @@ png_read_png(png_structrp png_ptr, png_inforp info_ptr,
/* Tell libpng to strip 16-bit/color files down to 8 bits per color.
*/
if ((transforms & PNG_TRANSFORM_SCALE_16) != 0)
/* Added at libpng-1.5.4. "strip_16" produces the same result that it
* did in earlier versions, while "scale_16" is now more accurate.
*/
/* Added at libpng-1.5.4. "strip_16" produces the same result that it
* did in earlier versions, while "scale_16" is now more accurate.
*/
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
png_set_scale_16(png_ptr);
#else
@ -1209,7 +1209,7 @@ png_read_png(png_structrp png_ptr, png_inforp info_ptr,
for (iptr = 0; iptr < info_ptr->height; iptr++)
info_ptr->row_pointers[iptr] = png_voidcast(png_bytep,
png_malloc(png_ptr, info_ptr->rowbytes));
png_malloc(png_ptr, info_ptr->rowbytes));
}
png_read_image(png_ptr, info_ptr->row_pointers);
@ -1683,10 +1683,11 @@ decode_gamma(png_image_read_control *display, png_uint_32 value, int encoding)
value *= 257;
break;
#ifdef __GNUC__
default:
png_error(display->image->opaque->png_ptr,
"unexpected encoding (internal error)");
break;
#endif
}
return value;
@ -2837,7 +2838,6 @@ png_image_read_colormap(png_voidp argument)
default:
png_error(png_ptr, "invalid PNG color type");
/*NOT REACHED*/
break;
}
/* Now deal with the output processing */
@ -2847,10 +2847,6 @@ png_image_read_colormap(png_voidp argument)
switch (data_encoding)
{
default:
png_error(png_ptr, "bad data option (internal error)");
break;
case P_sRGB:
/* Change to 8-bit sRGB */
png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, PNG_GAMMA_sRGB);
@ -2860,6 +2856,11 @@ png_image_read_colormap(png_voidp argument)
if (png_ptr->bit_depth > 8)
png_set_scale_16(png_ptr);
break;
#ifdef __GNUC__
default:
png_error(png_ptr, "bad data option (internal error)");
#endif
}
if (cmap_entries > 256 || cmap_entries > image->colormap_entries)
@ -3410,10 +3411,6 @@ png_image_read_background(png_voidp argument)
*/
switch (info_ptr->bit_depth)
{
default:
png_error(png_ptr, "unexpected bit depth");
break;
case 8:
/* 8-bit sRGB gray values with an alpha channel; the alpha channel is
* to be removed by composing on a background: either the row if
@ -3631,6 +3628,11 @@ png_image_read_background(png_voidp argument)
}
}
break;
#ifdef __GNUC__
default:
png_error(png_ptr, "unexpected bit depth");
#endif
}
return 1;

4
thirdparty/libpng/pngrio.c vendored
View File

@ -2,7 +2,7 @@
/* pngrio.c - functions for data input
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -26,7 +26,7 @@
* reads from a file pointer. Note that this routine sometimes gets called
* with very small lengths, so you should implement some kind of simple
* buffering if you are using unbuffered reads. This should never be asked
* to read more than 64K on a 16 bit machine.
* to read more than 64K on a 16-bit machine.
*/
void /* PRIVATE */
png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length)

32
thirdparty/libpng/pngrtran.c vendored
View File

@ -1,8 +1,8 @@
/* pngrtran.c - transforms the data in a row for PNG readers
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.19 [November 12, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -976,7 +976,6 @@ png_set_rgb_to_gray_fixed(png_structrp png_ptr, int error_action,
default:
png_error(png_ptr, "invalid error action to rgb_to_gray");
break;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
@ -1997,7 +1996,7 @@ png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr)
# endif
# else
/* No 16 bit support: force chopping 16-bit input down to 8, in this case
/* No 16-bit support: force chopping 16-bit input down to 8, in this case
* the app program can chose if both APIs are available by setting the
* correct scaling to use.
*/
@ -2098,10 +2097,10 @@ png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr)
defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
{
if (info_ptr->bit_depth < png_ptr->user_transform_depth)
if (png_ptr->user_transform_depth != 0)
info_ptr->bit_depth = png_ptr->user_transform_depth;
if (info_ptr->channels < png_ptr->user_transform_channels)
if (png_ptr->user_transform_channels != 0)
info_ptr->channels = png_ptr->user_transform_channels;
}
#endif
@ -2382,8 +2381,8 @@ png_do_scale_16_to_8(png_row_infop row_info, png_bytep row)
while (sp < ep)
{
/* The input is an array of 16 bit components, these must be scaled to
* 8 bits each. For a 16 bit value V the required value (from the PNG
/* The input is an array of 16-bit components, these must be scaled to
* 8 bits each. For a 16-bit value V the required value (from the PNG
* specification) is:
*
* (V * 255) / 65535
@ -2404,7 +2403,7 @@ png_do_scale_16_to_8(png_row_infop row_info, png_bytep row)
*
* The approximate differs from the exact answer only when (vlo-vhi) is
* 128; it then gives a correction of +1 when the exact correction is
* 0. This gives 128 errors. The exact answer (correct for all 16 bit
* 0. This gives 128 errors. The exact answer (correct for all 16-bit
* input values) is:
*
* error = (vlo-vhi+128)*65535 >> 24;
@ -3148,9 +3147,9 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
if (red != green || red != blue)
rgb_error |= 1;
/* From 1.5.5 in the 16 bit case do the accurate conversion even
/* From 1.5.5 in the 16-bit case do the accurate conversion even
* in the 'fast' case - this is because this is where the code
* ends up when handling linear 16 bit data.
* ends up when handling linear 16-bit data.
*/
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue + 16384) >>
15);
@ -3315,7 +3314,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
if ((png_uint_16)((*sp >> shift) & 0x0f)
== png_ptr->trans_color.gray)
{
unsigned int tmp = *sp & (0xf0f >> (4 - shift));
unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
tmp |= png_ptr->background.gray << shift;
*sp = (png_byte)(tmp & 0xff);
}
@ -3325,7 +3324,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
unsigned int p = (*sp >> shift) & 0x0f;
unsigned int g = (gamma_table[p | (p << 4)] >> 4) &
0x0f;
unsigned int tmp = *sp & (0xf0f >> (4 - shift));
unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
tmp |= g << shift;
*sp = (png_byte)(tmp & 0xff);
}
@ -3351,7 +3350,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
if ((png_uint_16)((*sp >> shift) & 0x0f)
== png_ptr->trans_color.gray)
{
unsigned int tmp = *sp & (0xf0f >> (4 - shift));
unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
tmp |= png_ptr->background.gray << shift;
*sp = (png_byte)(tmp & 0xff);
}
@ -4460,7 +4459,7 @@ png_do_expand(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++)
{
if (*sp == gray)
if ((*sp & 0xffU) == gray)
*dp-- = 0;
else
@ -4478,7 +4477,8 @@ png_do_expand(png_row_infop row_info, png_bytep row,
dp = row + (row_info->rowbytes << 1) - 1;
for (i = 0; i < row_width; i++)
{
if (*(sp - 1) == gray_high && *(sp) == gray_low)
if ((*(sp - 1) & 0xffU) == gray_high &&
(*(sp) & 0xffU) == gray_low)
{
*dp-- = 0;
*dp-- = 0;

427
thirdparty/libpng/pngrutil.c vendored
View File

@ -1,8 +1,8 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.20 [December 3, 2014]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -89,7 +89,13 @@ png_get_int_32)(png_const_bytep buf)
return uval;
uval = (uval ^ 0xffffffff) + 1; /* 2's complement: -x = ~x+1 */
return -(png_int_32)uval;
if ((uval & 0x80000000) == 0) /* no overflow */
return -(png_int_32)uval;
/* The following has to be safe; this function only gets called on PNG data
* and if we get here that data is invalid. 0 is the most safe value and
* if not then an attacker would surely just generate a PNG with 0 instead.
*/
return 0;
}
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
@ -98,7 +104,7 @@ png_get_uint_16)(png_const_bytep buf)
{
/* ANSI-C requires an int value to accomodate at least 16 bits so this
* works and allows the compiler not to worry about possible narrowing
* on 32 bit systems. (Pre-ANSI systems did not make integers smaller
* on 32-bit systems. (Pre-ANSI systems did not make integers smaller
* than 16 bits either.)
*/
unsigned int val =
@ -341,7 +347,7 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
* are minimal.
*/
(void)png_safecat(msg, (sizeof msg), 4, " using zstream");
#if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC
#if PNG_RELEASE_BUILD
png_chunk_warning(png_ptr, msg);
png_ptr->zowner = 0;
#else
@ -371,10 +377,16 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) ==
PNG_OPTION_ON)
{
window_bits = 15;
png_ptr->zstream_start = 0; /* fixed window size */
}
else
{
window_bits = 0;
png_ptr->zstream_start = 1;
}
# else
# define window_bits 0
# endif
@ -423,6 +435,31 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
#endif
}
#if PNG_ZLIB_VERNUM >= 0x1240
/* Handle the start of the inflate stream if we called inflateInit2(strm,0);
* in this case some zlib versions skip validation of the CINFO field and, in
* certain circumstances, libpng may end up displaying an invalid image, in
* contrast to implementations that call zlib in the normal way (e.g. libpng
* 1.5).
*/
int /* PRIVATE */
png_zlib_inflate(png_structrp png_ptr, int flush)
{
if (png_ptr->zstream_start && png_ptr->zstream.avail_in > 0)
{
if ((*png_ptr->zstream.next_in >> 4) > 7)
{
png_ptr->zstream.msg = "invalid window size (libpng)";
return Z_DATA_ERROR;
}
png_ptr->zstream_start = 0;
}
return inflate(&png_ptr->zstream, flush);
}
#endif /* Zlib >= 1.2.4 */
#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED
/* png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to
* allow the caller to do multiple calls if required. If the 'finish' flag is
@ -516,7 +553,7 @@ png_inflate(png_structrp png_ptr, png_uint_32 owner, int finish,
* the previous chunk of input data. Tell zlib if we have reached the
* end of the output buffer.
*/
ret = inflate(&png_ptr->zstream, avail_out > 0 ? Z_NO_FLUSH :
ret = PNG_INFLATE(png_ptr, avail_out > 0 ? Z_NO_FLUSH :
(finish ? Z_FINISH : Z_SYNC_FLUSH));
} while (ret == Z_OK);
@ -575,7 +612,7 @@ png_decompress_chunk(png_structrp png_ptr,
*/
png_alloc_size_t limit = PNG_SIZE_MAX;
# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
# ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_malloc_max > 0 &&
png_ptr->user_chunk_malloc_max < limit)
limit = png_ptr->user_chunk_malloc_max;
@ -670,7 +707,6 @@ png_decompress_chunk(png_structrp png_ptr,
* success)
*/
png_free(png_ptr, text);
text = NULL;
/* This really is very benign, but it's still an error because
* the extra space may otherwise be used as a Trojan Horse.
@ -766,7 +802,7 @@ png_inflate_read(png_structrp png_ptr, png_bytep read_buffer, uInt read_size,
* the available output is produced; this allows reading of truncated
* streams.
*/
ret = inflate(&png_ptr->zstream,
ret = PNG_INFLATE(png_ptr,
*chunk_bytes > 0 ? Z_NO_FLUSH : (finish ? Z_FINISH : Z_SYNC_FLUSH));
}
while (ret == Z_OK && (*out_size > 0 || png_ptr->zstream.avail_out > 0));
@ -867,7 +903,7 @@ void /* PRIVATE */
png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_color palette[PNG_MAX_PALETTE_LENGTH];
int num, i;
int max_palette_length, num, i;
#ifdef PNG_POINTER_INDEXING_SUPPORTED
png_colorp pal_ptr;
#endif
@ -928,6 +964,19 @@ png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
/* The cast is safe because 'length' is less than 3*PNG_MAX_PALETTE_LENGTH */
num = (int)length / 3;
/* If the palette has 256 or fewer entries but is too large for the bit
* depth, we don't issue an error, to preserve the behavior of previous
* libpng versions. We silently truncate the unused extra palette entries
* here.
*/
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
max_palette_length = (1 << png_ptr->bit_depth);
else
max_palette_length = PNG_MAX_PALETTE_LENGTH;
if (num > max_palette_length)
num = max_palette_length;
#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
{
@ -960,7 +1009,7 @@ png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#endif
{
png_crc_finish(png_ptr, 0);
png_crc_finish(png_ptr, (int) length - num * 3);
}
#ifndef PNG_READ_OPT_PLTE_SUPPORTED
@ -1147,11 +1196,13 @@ png_handle_sBIT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
return;
for (i=0; i<truelen; ++i)
{
if (buf[i] == 0 || buf[i] > sample_depth)
{
png_chunk_benign_error(png_ptr, "invalid");
return;
}
}
if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
@ -1462,10 +1513,10 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
finished = 1;
# ifdef PNG_sRGB_SUPPORTED
/* Check for a match against sRGB */
png_icc_set_sRGB(png_ptr,
&png_ptr->colorspace, profile,
png_ptr->zstream.adler);
/* Check for a match against sRGB */
png_icc_set_sRGB(png_ptr,
&png_ptr->colorspace, profile,
png_ptr->zstream.adler);
# endif
/* Steal the profile for info_ptr. */
@ -1650,7 +1701,7 @@ png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
++entry_start;
/* A sample depth should follow the separator, and we should be on it */
if (entry_start > buffer + length - 2)
if (length < 2U || entry_start > buffer + (length - 2U))
{
png_warning(png_ptr, "malformed sPLT chunk");
return;
@ -1675,8 +1726,8 @@ png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
if (dl > max_dl)
{
png_warning(png_ptr, "sPLT chunk too long");
return;
png_warning(png_ptr, "sPLT chunk too long");
return;
}
new_palette.nentries = (png_int_32)(data_length / entry_size);
@ -1686,8 +1737,8 @@ png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
if (new_palette.entries == NULL)
{
png_warning(png_ptr, "sPLT chunk requires too much memory");
return;
png_warning(png_ptr, "sPLT chunk requires too much memory");
return;
}
#ifdef PNG_POINTER_INDEXING_SUPPORTED
@ -1817,7 +1868,8 @@ png_handle_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
return;
}
if (length > png_ptr->num_palette || length > PNG_MAX_PALETTE_LENGTH ||
if (length > (unsigned int) png_ptr->num_palette ||
length > (unsigned int) PNG_MAX_PALETTE_LENGTH ||
length == 0)
{
png_crc_finish(png_ptr, length);
@ -1980,7 +2032,8 @@ png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
num = length / 2 ;
if (num != png_ptr->num_palette || num > PNG_MAX_PALETTE_LENGTH)
if (num != (unsigned int) png_ptr->num_palette ||
num > (unsigned int) PNG_MAX_PALETTE_LENGTH)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "invalid");
@ -2152,7 +2205,7 @@ png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
/* We need to have at least 12 bytes after the purpose string
* in order to get the parameter information.
*/
if (endptr <= buf + 12)
if (endptr - buf <= 12)
{
png_chunk_benign_error(png_ptr, "invalid");
return;
@ -2715,14 +2768,14 @@ png_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length)
png_ptr->unknown_chunk.data = NULL;
}
# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
if (png_ptr->user_chunk_malloc_max > 0 &&
png_ptr->user_chunk_malloc_max < limit)
limit = png_ptr->user_chunk_malloc_max;
# ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (png_ptr->user_chunk_malloc_max > 0 &&
png_ptr->user_chunk_malloc_max < limit)
limit = png_ptr->user_chunk_malloc_max;
# elif PNG_USER_CHUNK_MALLOC_MAX > 0
if (PNG_USER_CHUNK_MALLOC_MAX < limit)
limit = PNG_USER_CHUNK_MALLOC_MAX;
if (PNG_USER_CHUNK_MALLOC_MAX < limit)
limit = PNG_USER_CHUNK_MALLOC_MAX;
# endif
if (length <= limit)
@ -2785,7 +2838,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
*/
# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name);
keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name);
# endif
# endif
@ -2794,153 +2847,153 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
*/
# ifdef PNG_READ_USER_CHUNKS_SUPPORTED
/* The user callback takes precedence over the chunk keep value, but the
* keep value is still required to validate a save of a critical chunk.
*/
if (png_ptr->read_user_chunk_fn != NULL)
/* The user callback takes precedence over the chunk keep value, but the
* keep value is still required to validate a save of a critical chunk.
*/
if (png_ptr->read_user_chunk_fn != NULL)
{
if (png_cache_unknown_chunk(png_ptr, length) != 0)
{
if (png_cache_unknown_chunk(png_ptr, length) != 0)
/* Callback to user unknown chunk handler */
int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr,
&png_ptr->unknown_chunk);
/* ret is:
* negative: An error occurred; png_chunk_error will be called.
* zero: The chunk was not handled, the chunk will be discarded
* unless png_set_keep_unknown_chunks has been used to set
* a 'keep' behavior for this particular chunk, in which
* case that will be used. A critical chunk will cause an
* error at this point unless it is to be saved.
* positive: The chunk was handled, libpng will ignore/discard it.
*/
if (ret < 0)
png_chunk_error(png_ptr, "error in user chunk");
else if (ret == 0)
{
/* Callback to user unknown chunk handler */
int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr,
&png_ptr->unknown_chunk);
/* ret is:
* negative: An error occurred; png_chunk_error will be called.
* zero: The chunk was not handled, the chunk will be discarded
* unless png_set_keep_unknown_chunks has been used to set
* a 'keep' behavior for this particular chunk, in which
* case that will be used. A critical chunk will cause an
* error at this point unless it is to be saved.
* positive: The chunk was handled, libpng will ignore/discard it.
/* If the keep value is 'default' or 'never' override it, but
* still error out on critical chunks unless the keep value is
* 'always' While this is weird it is the behavior in 1.4.12.
* A possible improvement would be to obey the value set for the
* chunk, but this would be an API change that would probably
* damage some applications.
*
* The png_app_warning below catches the case that matters, where
* the application has not set specific save or ignore for this
* chunk or global save or ignore.
*/
if (ret < 0)
png_chunk_error(png_ptr, "error in user chunk");
else if (ret == 0)
if (keep < PNG_HANDLE_CHUNK_IF_SAFE)
{
/* If the keep value is 'default' or 'never' override it, but
* still error out on critical chunks unless the keep value is
* 'always' While this is weird it is the behavior in 1.4.12.
* A possible improvement would be to obey the value set for the
* chunk, but this would be an API change that would probably
* damage some applications.
*
* The png_app_warning below catches the case that matters, where
* the application has not set specific save or ignore for this
* chunk or global save or ignore.
*/
if (keep < PNG_HANDLE_CHUNK_IF_SAFE)
# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE)
{
# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE)
{
png_chunk_warning(png_ptr, "Saving unknown chunk:");
png_app_warning(png_ptr,
"forcing save of an unhandled chunk;"
" please call png_set_keep_unknown_chunks");
/* with keep = PNG_HANDLE_CHUNK_IF_SAFE */
}
# endif
keep = PNG_HANDLE_CHUNK_IF_SAFE;
png_chunk_warning(png_ptr, "Saving unknown chunk:");
png_app_warning(png_ptr,
"forcing save of an unhandled chunk;"
" please call png_set_keep_unknown_chunks");
/* with keep = PNG_HANDLE_CHUNK_IF_SAFE */
}
}
else /* chunk was handled */
{
handled = 1;
/* Critical chunks can be safely discarded at this point. */
keep = PNG_HANDLE_CHUNK_NEVER;
# endif
keep = PNG_HANDLE_CHUNK_IF_SAFE;
}
}
else
keep = PNG_HANDLE_CHUNK_NEVER; /* insufficient memory */
else /* chunk was handled */
{
handled = 1;
/* Critical chunks can be safely discarded at this point. */
keep = PNG_HANDLE_CHUNK_NEVER;
}
}
else
/* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */
keep = PNG_HANDLE_CHUNK_NEVER; /* insufficient memory */
}
else
/* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */
# endif /* READ_USER_CHUNKS */
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
{
/* keep is currently just the per-chunk setting, if there was no
* setting change it to the global default now (not that this may
* still be AS_DEFAULT) then obtain the cache of the chunk if required,
* if not simply skip the chunk.
*/
if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
keep = png_ptr->unknown_default;
if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
(keep == PNG_HANDLE_CHUNK_IF_SAFE &&
PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
{
/* keep is currently just the per-chunk setting, if there was no
* setting change it to the global default now (not that this may
* still be AS_DEFAULT) then obtain the cache of the chunk if required,
* if not simply skip the chunk.
*/
if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
keep = png_ptr->unknown_default;
if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
(keep == PNG_HANDLE_CHUNK_IF_SAFE &&
PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
{
if (png_cache_unknown_chunk(png_ptr, length) == 0)
keep = PNG_HANDLE_CHUNK_NEVER;
}
else
png_crc_finish(png_ptr, length);
if (png_cache_unknown_chunk(png_ptr, length) == 0)
keep = PNG_HANDLE_CHUNK_NEVER;
}
else
png_crc_finish(png_ptr, length);
}
# else
# ifndef PNG_READ_USER_CHUNKS_SUPPORTED
# error no method to support READ_UNKNOWN_CHUNKS
# endif
{
/* If here there is no read callback pointer set and no support is
* compiled in to just save the unknown chunks, so simply skip this
* chunk. If 'keep' is something other than AS_DEFAULT or NEVER then
* the app has erroneously asked for unknown chunk saving when there
* is no support.
*/
if (keep > PNG_HANDLE_CHUNK_NEVER)
png_app_error(png_ptr, "no unknown chunk support available");
{
/* If here there is no read callback pointer set and no support is
* compiled in to just save the unknown chunks, so simply skip this
* chunk. If 'keep' is something other than AS_DEFAULT or NEVER then
* the app has erroneously asked for unknown chunk saving when there
* is no support.
*/
if (keep > PNG_HANDLE_CHUNK_NEVER)
png_app_error(png_ptr, "no unknown chunk support available");
png_crc_finish(png_ptr, length);
}
png_crc_finish(png_ptr, length);
}
# endif
# ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
/* Now store the chunk in the chunk list if appropriate, and if the limits
* permit it.
*/
if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
(keep == PNG_HANDLE_CHUNK_IF_SAFE &&
PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
/* Now store the chunk in the chunk list if appropriate, and if the limits
* permit it.
*/
if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
(keep == PNG_HANDLE_CHUNK_IF_SAFE &&
PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
{
# ifdef PNG_USER_LIMITS_SUPPORTED
switch (png_ptr->user_chunk_cache_max)
{
# ifdef PNG_USER_LIMITS_SUPPORTED
switch (png_ptr->user_chunk_cache_max)
{
case 2:
png_ptr->user_chunk_cache_max = 1;
png_chunk_benign_error(png_ptr, "no space in chunk cache");
/* FALL THROUGH */
case 1:
/* NOTE: prior to 1.6.0 this case resulted in an unknown critical
* chunk being skipped, now there will be a hard error below.
*/
break;
case 2:
png_ptr->user_chunk_cache_max = 1;
png_chunk_benign_error(png_ptr, "no space in chunk cache");
/* FALL THROUGH */
case 1:
/* NOTE: prior to 1.6.0 this case resulted in an unknown critical
* chunk being skipped, now there will be a hard error below.
*/
break;
default: /* not at limit */
--(png_ptr->user_chunk_cache_max);
/* FALL THROUGH */
case 0: /* no limit */
# endif /* USER_LIMITS */
/* Here when the limit isn't reached or when limits are compiled
* out; store the chunk.
*/
png_set_unknown_chunks(png_ptr, info_ptr,
&png_ptr->unknown_chunk, 1);
handled = 1;
# ifdef PNG_USER_LIMITS_SUPPORTED
break;
}
# endif
default: /* not at limit */
--(png_ptr->user_chunk_cache_max);
/* FALL THROUGH */
case 0: /* no limit */
# endif /* USER_LIMITS */
/* Here when the limit isn't reached or when limits are compiled
* out; store the chunk.
*/
png_set_unknown_chunks(png_ptr, info_ptr,
&png_ptr->unknown_chunk, 1);
handled = 1;
# ifdef PNG_USER_LIMITS_SUPPORTED
break;
}
# endif
}
# else /* no store support: the chunk must be handled by the user callback */
PNG_UNUSED(info_ptr)
PNG_UNUSED(info_ptr)
# endif
/* Regardless of the error handling below the cached data (if any) can be
@ -3042,13 +3095,13 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
end_ptr = dp + PNG_ROWBYTES(pixel_depth, row_width) - 1;
end_byte = *end_ptr;
# ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
/* little-endian byte */
end_mask = 0xff << end_mask;
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
/* little-endian byte */
end_mask = 0xff << end_mask;
else /* big-endian byte */
else /* big-endian byte */
# endif
end_mask = 0xff >> end_mask;
end_mask = 0xff >> end_mask;
/* end_mask is now the bits to *keep* from the destination row */
}
@ -3206,12 +3259,12 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
png_uint_32 mask;
# ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
mask = MASK(pass, pixel_depth, display, 0);
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
mask = MASK(pass, pixel_depth, display, 0);
else
else
# endif
mask = MASK(pass, pixel_depth, display, 1);
mask = MASK(pass, pixel_depth, display, 1);
for (;;)
{
@ -3812,15 +3865,15 @@ png_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row,
p = b - c;
pc = a - c;
# ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
# else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
# endif
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
/* Find the best predictor, the least of pa, pb, pc favoring the earlier
* ones in the case of a tie.
@ -3867,15 +3920,15 @@ png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
p = b - c;
pc = a - c;
# ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
# else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
# endif
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
if (pb < pa) pa = pb, a = b;
if (pc < pa) a = c;
@ -4017,7 +4070,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
*
* TODO: deal more elegantly with truncated IDAT lists.
*/
ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
ret = PNG_INFLATE(png_ptr, Z_NO_FLUSH);
/* Take the unconsumed output back. */
if (output != NULL)
@ -4280,18 +4333,18 @@ png_read_start_row(png_structrp png_ptr)
#ifdef PNG_READ_EXPAND_16_SUPPORTED
if ((png_ptr->transformations & PNG_EXPAND_16) != 0)
{
# ifdef PNG_READ_EXPAND_SUPPORTED
/* In fact it is an error if it isn't supported, but checking is
* the safe way.
*/
if ((png_ptr->transformations & PNG_EXPAND) != 0)
{
if (png_ptr->bit_depth < 16)
max_pixel_depth *= 2;
}
else
# endif
png_ptr->transformations &= ~PNG_EXPAND_16;
# ifdef PNG_READ_EXPAND_SUPPORTED
/* In fact it is an error if it isn't supported, but checking is
* the safe way.
*/
if ((png_ptr->transformations & PNG_EXPAND) != 0)
{
if (png_ptr->bit_depth < 16)
max_pixel_depth *= 2;
}
else
# endif
png_ptr->transformations &= ~PNG_EXPAND_16;
}
#endif

117
thirdparty/libpng/pngset.c vendored
View File

@ -1,7 +1,7 @@
/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Last changed in libpng 1.6.21 [January 15, 2016]
* Copyright (c) 1998-2015 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.)
@ -123,12 +123,12 @@ png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
png_fixed(png_ptr, red_X, "cHRM Red X"),
png_fixed(png_ptr, red_Y, "cHRM Red Y"),
png_fixed(png_ptr, red_Z, "cHRM Red Z"),
png_fixed(png_ptr, green_X, "cHRM Red X"),
png_fixed(png_ptr, green_Y, "cHRM Red Y"),
png_fixed(png_ptr, green_Z, "cHRM Red Z"),
png_fixed(png_ptr, blue_X, "cHRM Red X"),
png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
png_fixed(png_ptr, green_X, "cHRM Green X"),
png_fixed(png_ptr, green_Y, "cHRM Green Y"),
png_fixed(png_ptr, green_Z, "cHRM Green Z"),
png_fixed(png_ptr, blue_X, "cHRM Blue X"),
png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
}
# endif /* FLOATING_POINT */
@ -513,12 +513,17 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
png_const_colorp palette, int num_palette)
{
png_uint_32 max_palette_length;
png_debug1(1, "in %s storage function", "PLTE");
if (png_ptr == NULL || info_ptr == NULL)
return;
if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
(1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
if (num_palette < 0 || num_palette > (int) max_palette_length)
{
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
png_error(png_ptr, "Invalid palette length");
@ -551,8 +556,8 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
/* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
* of num_palette entries, in case of an invalid PNG file that has
* too-large sample values.
* of num_palette entries, in case of an invalid PNG file or incorrect
* call to png_set_PLTE() with too-large sample values.
*/
png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
@ -673,7 +678,6 @@ png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
if (new_iccp_profile == NULL)
{
png_free(png_ptr, new_iccp_name);
new_iccp_name = NULL;
png_benign_error(png_ptr,
"Insufficient memory to process iCCP profile");
@ -710,7 +714,7 @@ png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
{
int i;
png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :
png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
(unsigned long)png_ptr->chunk_name);
if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
@ -1522,6 +1526,9 @@ png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
}
#ifndef __COVERITY__
/* Some compilers complain that this is always false. However, it
* can be true when integer overflow happens.
*/
if (size > ZLIB_IO_MAX)
{
png_warning(png_ptr,
@ -1566,7 +1573,7 @@ png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
{
/* Images with dimensions larger than these limits will be
* rejected by png_set_IHDR(). To accept any PNG datastream
* regardless of dimensions, set both limits to 0x7ffffffL.
* regardless of dimensions, set both limits to 0x7fffffff.
*/
if (png_ptr == NULL)
return;
@ -1637,4 +1644,88 @@ png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
png_ptr->num_palette_max = -1;
}
#endif
#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
* and if invalid, correct the keyword rather than discarding the entire
* chunk. The PNG 1.0 specification requires keywords 1-79 characters in
* length, forbids leading or trailing whitespace, multiple internal spaces,
* and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
*
* The 'new_key' buffer must be 80 characters in size (for the keyword plus a
* trailing '\0'). If this routine returns 0 then there was no keyword, or a
* valid one could not be generated, and the caller must png_error.
*/
png_uint_32 /* PRIVATE */
png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
{
png_const_charp orig_key = key;
png_uint_32 key_len = 0;
int bad_character = 0;
int space = 1;
png_debug(1, "in png_check_keyword");
if (key == NULL)
{
*new_key = 0;
return 0;
}
while (*key && key_len < 79)
{
png_byte ch = (png_byte)*key++;
if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
*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;
/* If the character was not a space then it is invalid. */
if (ch != 32)
bad_character = ch;
}
else if (bad_character == 0)
bad_character = ch; /* just skip it, record the first error */
}
if (key_len > 0 && space != 0) /* trailing space */
{
--key_len, --new_key;
if (bad_character == 0)
bad_character = 32;
}
/* Terminate the keyword */
*new_key = 0;
if (key_len == 0)
return 0;
#ifdef PNG_WARNINGS_SUPPORTED
/* Try to only output one warning per keyword: */
if (*key != 0) /* keyword too long */
png_warning(png_ptr, "keyword truncated");
else if (bad_character != 0)
{
PNG_WARNING_PARAMETERS(p)
png_warning_parameter(p, 1, orig_key);
png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
}
#endif /* WARNINGS */
return key_len;
}
#endif /* TEXT || pCAL || iCCP || sPLT */
#endif /* READ || WRITE */

35
thirdparty/libpng/pngstruct.h vendored
View File

@ -1,8 +1,8 @@
/* pngstruct.h - header file for PNG reference library
*
* Last changed in libpng 1.6.1 [March 28, 2013]
* Copyright (c) 1998-2013 Glenn Randers-Pehrson
* Last changed in libpng 1.6.18 [July 23, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -219,16 +219,18 @@ struct png_struct_def
png_uint_32 row_number; /* current row in interlace pass */
png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
png_bytep prev_row; /* buffer to save previous (unfiltered) row.
* This is a pointer into big_prev_row
* While reading this is a pointer into
* big_prev_row; while writing it is separately
* allocated if needed.
*/
png_bytep row_buf; /* buffer to save current (unfiltered) row.
* This is a pointer into big_row_buf
* While reading, this is a pointer into
* big_row_buf; while writing it is separately
* allocated.
*/
#ifdef PNG_WRITE_SUPPORTED
png_bytep sub_row; /* buffer to save "sub" row when filtering */
png_bytep up_row; /* buffer to save "up" row when filtering */
png_bytep avg_row; /* buffer to save "avg" row when filtering */
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
#ifdef PNG_WRITE_FILTER_SUPPORTED
png_bytep try_row; /* buffer to save trial row when filtering */
png_bytep tst_row; /* buffer to save best trial row when filtering */
#endif
png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
@ -261,6 +263,9 @@ struct png_struct_def
/* pixel depth used for the row buffers */
png_byte transformed_pixel_depth;
/* pixel depth after read/write transforms */
#if PNG_ZLIB_VERNUM >= 0x1240
png_byte zstream_start; /* at start of an input zlib stream */
#endif /* Zlib >= 1.2.4 */
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
png_uint_16 filler; /* filler bytes for pixel expansion */
#endif
@ -346,17 +351,7 @@ struct png_struct_def
png_bytep quantize_index; /* index translation for palette files */
#endif
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
png_byte heuristic_method; /* heuristic for row filter selection */
png_byte num_prev_filters; /* number of weights for previous rows */
png_bytep prev_filters; /* filter type(s) of previous row(s) */
png_uint_16p filter_weights; /* weight(s) for previous line(s) */
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
png_uint_16p filter_costs; /* relative filter calculation cost */
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
#endif
/* Options */
/* Options */
#ifdef PNG_SET_OPTION_SUPPORTED
png_byte options; /* On/off state (up to 4 options) */
#endif

10
thirdparty/libpng/pngtrans.c vendored
View File

@ -1,8 +1,8 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.18 [July 23, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -30,7 +30,7 @@ png_set_bgr(png_structrp png_ptr)
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* Turn on 16 bit byte swapping */
/* Turn on 16-bit byte swapping */
void PNGAPI
png_set_swap(png_structrp png_ptr)
{
@ -313,7 +313,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
#ifdef PNG_16BIT_SUPPORTED
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* Swaps byte order on 16 bit depth images */
/* Swaps byte order on 16-bit depth images */
void /* PRIVATE */
png_do_swap(png_row_infop row_info, png_bytep row)
{
@ -704,7 +704,7 @@ png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
*/
for (; rp > png_ptr->row_buf; rp--)
{
if (*rp >> padding != 0)
if ((*rp >> padding) != 0)
png_ptr->num_palette_max = 1;
padding = 0;
}

4
thirdparty/libpng/pngwio.c vendored
View File

@ -2,7 +2,7 @@
/* pngwio.c - functions for data output
*
* Last changed in libpng 1.6.15 [November 20, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* Copyright (c) 1998-2002,2004,2006-2014 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.)
*
@ -26,7 +26,7 @@
* writes to a file pointer. Note that this routine sometimes gets called
* with very small lengths, so you should implement some kind of simple
* buffering if you are using unbuffered writes. This should never be asked
* to write more than 64K on a 16 bit machine.
* to write more than 64K on a 16-bit machine.
*/
void /* PRIVATE */

617
thirdparty/libpng/pngwrite.c vendored
View File

@ -1,8 +1,8 @@
/* pngwrite.c - general routines to write a PNG file
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.19 [November 12, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -90,43 +90,44 @@ png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr)
if ((png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE) == 0)
{
/* Write PNG signature */
png_write_sig(png_ptr);
/* Write PNG signature */
png_write_sig(png_ptr);
#ifdef PNG_MNG_FEATURES_SUPPORTED
if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 && \
png_ptr->mng_features_permitted != 0)
{
png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
png_ptr->mng_features_permitted = 0;
}
if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 && \
png_ptr->mng_features_permitted != 0)
{
png_warning(png_ptr,
"MNG features are not allowed in a PNG datastream");
png_ptr->mng_features_permitted = 0;
}
#endif
/* Write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
info_ptr->filter_type,
/* Write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
info_ptr->filter_type,
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
info_ptr->interlace_type
info_ptr->interlace_type
#else
0
0
#endif
);
);
/* The rest of these check to see if the valid field has the appropriate
* flag set, and if it does, writes the chunk.
*
* 1.6.0: COLORSPACE support controls the writing of these chunks too, and
* the chunks will be written if the WRITE routine is there and information
* is available in the COLORSPACE. (See png_colorspace_sync_info in png.c
* for where the valid flags get set.)
*
* Under certain circumstances the colorspace can be invalidated without
* syncing the info_struct 'valid' flags; this happens if libpng detects and
* error and calls png_error while the color space is being set, yet the
* application continues writing the PNG. So check the 'invalid' flag here
* too.
*/
/* The rest of these check to see if the valid field has the appropriate
* flag set, and if it does, writes the chunk.
*
* 1.6.0: COLORSPACE support controls the writing of these chunks too, and
* the chunks will be written if the WRITE routine is there and
* information * is available in the COLORSPACE. (See
* png_colorspace_sync_info in png.c for where the valid flags get set.)
*
* Under certain circumstances the colorspace can be invalidated without
* syncing the info_struct 'valid' flags; this happens if libpng detects
* an error and calls png_error while the color space is being set, yet
* the application continues writing the PNG. So check the 'invalid'
* flag here too.
*/
#ifdef PNG_GAMMA_SUPPORTED
# ifdef PNG_WRITE_gAMA_SUPPORTED
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
@ -137,50 +138,50 @@ png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr)
#endif
#ifdef PNG_COLORSPACE_SUPPORTED
/* Write only one of sRGB or an ICC profile. If a profile was supplied
* and it matches one of the known sRGB ones issue a warning.
*/
/* Write only one of sRGB or an ICC profile. If a profile was supplied
* and it matches one of the known sRGB ones issue a warning.
*/
# ifdef PNG_WRITE_iCCP_SUPPORTED
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
(info_ptr->valid & PNG_INFO_iCCP) != 0)
{
# ifdef PNG_WRITE_sRGB_SUPPORTED
if ((info_ptr->valid & PNG_INFO_sRGB) != 0)
png_app_warning(png_ptr,
"profile matches sRGB but writing iCCP instead");
# endif
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
(info_ptr->valid & PNG_INFO_iCCP) != 0)
{
# ifdef PNG_WRITE_sRGB_SUPPORTED
if ((info_ptr->valid & PNG_INFO_sRGB) != 0)
png_app_warning(png_ptr,
"profile matches sRGB but writing iCCP instead");
# endif
png_write_iCCP(png_ptr, info_ptr->iccp_name,
info_ptr->iccp_profile);
}
png_write_iCCP(png_ptr, info_ptr->iccp_name,
info_ptr->iccp_profile);
}
# ifdef PNG_WRITE_sRGB_SUPPORTED
else
# endif
# endif
# ifdef PNG_WRITE_sRGB_SUPPORTED
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
(info_ptr->valid & PNG_INFO_sRGB) != 0)
png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent);
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
(info_ptr->valid & PNG_INFO_sRGB) != 0)
png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent);
# endif /* WRITE_sRGB */
#endif /* COLORSPACE */
#ifdef PNG_WRITE_sBIT_SUPPORTED
if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
#endif
#ifdef PNG_COLORSPACE_SUPPORTED
# ifdef PNG_WRITE_cHRM_SUPPORTED
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0 &&
(info_ptr->valid & PNG_INFO_cHRM) != 0)
png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy);
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0 &&
(info_ptr->valid & PNG_INFO_cHRM) != 0)
png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy);
# endif
#endif
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR);
write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR);
#endif
png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
@ -205,7 +206,7 @@ png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
png_write_PLTE(png_ptr, info_ptr->palette,
(png_uint_32)info_ptr->num_palette);
else if ((info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) !=0)
else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
png_error(png_ptr, "Valid palette required for paletted images");
#ifdef PNG_WRITE_tRNS_SUPPORTED
@ -216,8 +217,13 @@ png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0 &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
int j;
for (j = 0; j<(int)info_ptr->num_trans; j++)
int j, jend;
jend = info_ptr->num_trans;
if (jend > PNG_MAX_PALETTE_LENGTH)
jend = PNG_MAX_PALETTE_LENGTH;
for (j = 0; j<jend; ++j)
info_ptr->trans_alpha[j] =
(png_byte)(255 - info_ptr->trans_alpha[j]);
}
@ -538,7 +544,7 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
/* App warnings are warnings in release (or release candidate) builds but
* are errors during development.
*/
#if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC
#if PNG_RELEASE_BUILD
png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
#endif
@ -849,7 +855,7 @@ png_write_row(png_structrp png_ptr, png_const_bytep row)
* which is also the output depth.
*/
if (row_info.pixel_depth != png_ptr->pixel_depth ||
row_info.pixel_depth != png_ptr->transformed_pixel_depth)
row_info.pixel_depth != png_ptr->transformed_pixel_depth)
png_error(png_ptr, "internal write transform logic error");
#ifdef PNG_MNG_FEATURES_SUPPORTED
@ -917,10 +923,6 @@ png_write_flush(png_structrp png_ptr)
}
#endif /* WRITE_FLUSH */
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
static void png_reset_filter_heuristics(png_structrp png_ptr);/* forward decl */
#endif
/* Free any memory used in png_ptr struct without freeing the struct itself. */
static void
png_write_destroy(png_structrp png_ptr)
@ -937,24 +939,11 @@ png_write_destroy(png_structrp png_ptr)
png_ptr->row_buf = NULL;
#ifdef PNG_WRITE_FILTER_SUPPORTED
png_free(png_ptr, png_ptr->prev_row);
png_free(png_ptr, png_ptr->sub_row);
png_free(png_ptr, png_ptr->up_row);
png_free(png_ptr, png_ptr->avg_row);
png_free(png_ptr, png_ptr->paeth_row);
png_free(png_ptr, png_ptr->try_row);
png_free(png_ptr, png_ptr->tst_row);
png_ptr->prev_row = NULL;
png_ptr->sub_row = NULL;
png_ptr->up_row = NULL;
png_ptr->avg_row = NULL;
png_ptr->paeth_row = NULL;
#endif
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
/* Use this to save a little code space, it doesn't free the filter_costs */
png_reset_filter_heuristics(png_ptr);
png_free(png_ptr, png_ptr->filter_costs);
png_free(png_ptr, png_ptr->inv_filter_costs);
png_ptr->filter_costs = NULL;
png_ptr->inv_filter_costs = NULL;
png_ptr->try_row = NULL;
png_ptr->tst_row = NULL;
#endif
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
@ -1044,6 +1033,7 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
#endif /* WRITE_FILTER */
}
#ifdef PNG_WRITE_FILTER_SUPPORTED
/* If we have allocated the row_buf, this means we have already started
* with the image and we should have allocated all of the filter buffers
* that have been selected. If prev_row isn't already allocated, then
@ -1052,203 +1042,76 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
* wants to start and stop using particular filters during compression,
* it should start out with all of the filters, and then remove them
* or add them back after the start of compression.
*
* NOTE: this is a nasty constraint on the code, because it means that the
* prev_row buffer must be maintained even if there are currently no
* 'prev_row' requiring filters active.
*/
if (png_ptr->row_buf != NULL)
{
#ifdef PNG_WRITE_FILTER_SUPPORTED
if ((png_ptr->do_filter & PNG_FILTER_SUB) != 0 &&
png_ptr->sub_row == NULL)
int num_filters;
png_alloc_size_t buf_size;
/* Repeat the checks in png_write_start_row; 1 pixel high or wide
* images cannot benefit from certain filters. If this isn't done here
* the check below will fire on 1 pixel high images.
*/
if (png_ptr->height == 1)
filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
if (png_ptr->width == 1)
filters &= ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH);
if ((filters & (PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH)) != 0
&& png_ptr->prev_row == NULL)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
/* This is the error case, however it is benign - the previous row
* is not available so the filter can't be used. Just warn here.
*/
png_app_warning(png_ptr,
"png_set_filter: UP/AVG/PAETH cannot be added after start");
filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
}
if ((png_ptr->do_filter & PNG_FILTER_UP) != 0 &&
png_ptr->up_row == NULL)
num_filters = 0;
if (filters & PNG_FILTER_SUB)
num_filters++;
if (filters & PNG_FILTER_UP)
num_filters++;
if (filters & PNG_FILTER_AVG)
num_filters++;
if (filters & PNG_FILTER_PAETH)
num_filters++;
/* Allocate needed row buffers if they have not already been
* allocated.
*/
buf_size = PNG_ROWBYTES(png_ptr->usr_channels * png_ptr->usr_bit_depth,
png_ptr->width) + 1;
if (png_ptr->try_row == NULL)
png_ptr->try_row = png_voidcast(png_bytep,
png_malloc(png_ptr, buf_size));
if (num_filters > 1)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Up filter after starting");
png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
~PNG_FILTER_UP);
}
else
{
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
}
if (png_ptr->tst_row == NULL)
png_ptr->tst_row = png_voidcast(png_bytep,
png_malloc(png_ptr, buf_size));
}
if ((png_ptr->do_filter & PNG_FILTER_AVG) != 0 &&
png_ptr->avg_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Average filter after starting");
png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
~PNG_FILTER_AVG);
}
else
{
png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
}
}
if ((png_ptr->do_filter & PNG_FILTER_PAETH) != 0 &&
png_ptr->paeth_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Paeth filter after starting");
png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
}
else
{
png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
}
if (png_ptr->do_filter == PNG_NO_FILTERS)
#endif /* WRITE_FILTER */
png_ptr->do_filter = PNG_FILTER_NONE;
}
png_ptr->do_filter = (png_byte)filters;
#endif
}
else
png_error(png_ptr, "Unknown custom filter method");
}
/* This allows us to influence the way in which libpng chooses the "best"
* filter for the current scanline. While the "minimum-sum-of-absolute-
* differences metric is relatively fast and effective, there is some
* question as to whether it can be improved upon by trying to keep the
* filtered data going to zlib more consistent, hopefully resulting in
* better compression.
*/
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
/* Convenience reset API. */
static void
png_reset_filter_heuristics(png_structrp png_ptr)
{
/* Clear out any old values in the 'weights' - this must be done because if
* the app calls set_filter_heuristics multiple times with different
* 'num_weights' values we would otherwise potentially have wrong sized
* arrays.
*/
png_ptr->num_prev_filters = 0;
png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
if (png_ptr->prev_filters != NULL)
{
png_bytep old = png_ptr->prev_filters;
png_ptr->prev_filters = NULL;
png_free(png_ptr, old);
}
if (png_ptr->filter_weights != NULL)
{
png_uint_16p old = png_ptr->filter_weights;
png_ptr->filter_weights = NULL;
png_free(png_ptr, old);
}
if (png_ptr->inv_filter_weights != NULL)
{
png_uint_16p old = png_ptr->inv_filter_weights;
png_ptr->inv_filter_weights = NULL;
png_free(png_ptr, old);
}
/* Leave the filter_costs - this array is fixed size. */
}
static int
png_init_filter_heuristics(png_structrp png_ptr, int heuristic_method,
int num_weights)
{
if (png_ptr == NULL)
return 0;
/* Clear out the arrays */
png_reset_filter_heuristics(png_ptr);
/* Check arguments; the 'reset' function makes the correct settings for the
* unweighted case, but we must handle the weight case by initializing the
* arrays for the caller.
*/
if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int i;
if (num_weights > 0)
{
png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
(png_uint_32)((sizeof (png_byte)) * num_weights));
/* To make sure that the weighting starts out fairly */
for (i = 0; i < num_weights; i++)
{
png_ptr->prev_filters[i] = 255;
}
png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)((sizeof (png_uint_16)) * num_weights));
png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)((sizeof (png_uint_16)) * num_weights));
for (i = 0; i < num_weights; i++)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
/* Safe to set this now */
png_ptr->num_prev_filters = (png_byte)num_weights;
}
/* If, in the future, there are other filter methods, this would
* need to be based on png_ptr->filter.
*/
if (png_ptr->filter_costs == NULL)
{
png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST));
png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST));
}
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
{
png_ptr->inv_filter_costs[i] =
png_ptr->filter_costs[i] = PNG_COST_FACTOR;
}
/* All the arrays are inited, safe to set this: */
png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED;
/* Return the 'ok' code. */
return 1;
}
else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT ||
heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
{
return 1;
}
else
{
png_warning(png_ptr, "Unknown filter heuristic method");
return 0;
}
}
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */
/* Provide floating and fixed point APIs */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
@ -1256,52 +1119,11 @@ png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method,
int num_weights, png_const_doublep filter_weights,
png_const_doublep filter_costs)
{
png_debug(1, "in png_set_filter_heuristics");
/* The internal API allocates all the arrays and ensures that the elements of
* those arrays are set to the default value.
*/
if (png_init_filter_heuristics(png_ptr, heuristic_method, num_weights) == 0)
return;
/* If using the weighted method copy in the weights. */
if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int i;
for (i = 0; i < num_weights; i++)
{
if (filter_weights[i] <= 0.0)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
else
{
png_ptr->inv_filter_weights[i] =
(png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5);
png_ptr->filter_weights[i] =
(png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5);
}
}
/* Here is where we set the relative costs of the different filters. We
* should take the desired compression level into account when setting
* the costs, so that Paeth, for instance, has a high relative cost at low
* compression levels, while it has a lower relative cost at higher
* compression settings. The filter types are in order of increasing
* relative cost, so it would be possible to do this with an algorithm.
*/
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0)
{
png_ptr->inv_filter_costs[i] =
(png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5);
png_ptr->filter_costs[i] =
(png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5);
}
}
PNG_UNUSED(png_ptr)
PNG_UNUSED(heuristic_method)
PNG_UNUSED(num_weights)
PNG_UNUSED(filter_weights)
PNG_UNUSED(filter_costs)
}
#endif /* FLOATING_POINT */
@ -1311,63 +1133,11 @@ png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method,
int num_weights, png_const_fixed_point_p filter_weights,
png_const_fixed_point_p filter_costs)
{
png_debug(1, "in png_set_filter_heuristics_fixed");
/* The internal API allocates all the arrays and ensures that the elements of
* those arrays are set to the default value.
*/
if (png_init_filter_heuristics(png_ptr, heuristic_method, num_weights) == 0)
return;
/* If using the weighted method copy in the weights. */
if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int i;
for (i = 0; i < num_weights; i++)
{
if (filter_weights[i] <= 0)
{
png_ptr->inv_filter_weights[i] =
png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
}
else
{
png_ptr->inv_filter_weights[i] = (png_uint_16)
((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);
png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR*
PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]);
}
}
/* Here is where we set the relative costs of the different filters. We
* should take the desired compression level into account when setting
* the costs, so that Paeth, for instance, has a high relative cost at low
* compression levels, while it has a lower relative cost at higher
* compression settings. The filter types are in order of increasing
* relative cost, so it would be possible to do this with an algorithm.
*/
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
if (filter_costs[i] >= PNG_FP_1)
{
png_uint_32 tmp;
/* Use a 32 bit unsigned temporary here because otherwise the
* intermediate value will be a 32 bit *signed* integer (ANSI rules)
* and this will get the wrong answer on division.
*/
tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2);
tmp /= filter_costs[i];
png_ptr->inv_filter_costs[i] = (png_uint_16)tmp;
tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;
tmp /= PNG_FP_1;
png_ptr->filter_costs[i] = (png_uint_16)tmp;
}
}
PNG_UNUSED(png_ptr)
PNG_UNUSED(heuristic_method)
PNG_UNUSED(num_weights)
PNG_UNUSED(filter_weights)
PNG_UNUSED(filter_costs)
}
#endif /* FIXED_POINT */
#endif /* WRITE_WEIGHTED_FILTER */
@ -1616,14 +1386,14 @@ png_write_png(png_structrp png_ptr, png_inforp info_ptr,
* alpha channel.
*/
if ((transforms & (PNG_TRANSFORM_STRIP_FILLER_AFTER|
PNG_TRANSFORM_STRIP_FILLER_BEFORE)) != 0)
PNG_TRANSFORM_STRIP_FILLER_BEFORE)) != 0)
{
#ifdef PNG_WRITE_FILLER_SUPPORTED
if ((transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) != 0)
{
if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
png_app_error(png_ptr,
"PNG_TRANSFORM_STRIP_FILLER: BEFORE+AFTER not supported");
"PNG_TRANSFORM_STRIP_FILLER: BEFORE+AFTER not supported");
/* Continue if ignored - this is the pre-1.6.10 behavior */
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
@ -1652,7 +1422,7 @@ png_write_png(png_structrp png_ptr, png_inforp info_ptr,
png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported");
#endif
/* Swap bits of 1, 2, 4 bit packed pixel formats */
/* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats */
if ((transforms & PNG_TRANSFORM_PACKSWAP) != 0)
#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
png_set_packswap(png_ptr);
@ -1682,13 +1452,13 @@ png_write_png(png_structrp png_ptr, png_inforp info_ptr,
#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
#ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */
# ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */
/* Initialize the write structure - general purpose utility. */
static int
png_image_write_init(png_imagep image)
{
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image,
png_safe_error, png_safe_warning);
png_safe_error, png_safe_warning);
if (png_ptr != NULL)
{
@ -1697,7 +1467,7 @@ png_image_write_init(png_imagep image)
if (info_ptr != NULL)
{
png_controlp control = png_voidcast(png_controlp,
png_malloc_warn(png_ptr, (sizeof *control)));
png_malloc_warn(png_ptr, (sizeof *control)));
if (control != NULL)
{
@ -1744,12 +1514,12 @@ static int
png_write_image_16bit(png_voidp argument)
{
png_image_write_control *display = png_voidcast(png_image_write_control*,
argument);
argument);
png_imagep image = display->image;
png_structrp png_ptr = image->opaque->png_ptr;
png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
display->first_row);
display->first_row);
png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row);
png_uint_16p row_end;
const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
@ -1758,17 +1528,18 @@ png_write_image_16bit(png_voidp argument)
if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
{
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
{
aindex = -1;
++input_row; /* To point to the first component */
++output_row;
}
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
{
aindex = -1;
++input_row; /* To point to the first component */
++output_row;
}
else
# endif
aindex = channels;
# else
aindex = channels;
# endif
}
else
@ -1850,7 +1621,7 @@ png_write_image_16bit(png_voidp argument)
* calculation can be done to 15 bits of accuracy; however, the output needs to
* be scaled in the range 0..255*65535, so include that scaling here.
*/
#define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha)
# define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha)
static png_byte
png_unpremultiply(png_uint_32 component, png_uint_32 alpha,
@ -1901,12 +1672,12 @@ static int
png_write_image_8bit(png_voidp argument)
{
png_image_write_control *display = png_voidcast(png_image_write_control*,
argument);
argument);
png_imagep image = display->image;
png_structrp png_ptr = image->opaque->png_ptr;
png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
display->first_row);
display->first_row);
png_bytep output_row = png_voidcast(png_bytep, display->local_row);
png_uint_32 y = image->height;
const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
@ -1916,17 +1687,17 @@ png_write_image_8bit(png_voidp argument)
png_bytep row_end;
int aindex;
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
{
aindex = -1;
++input_row; /* To point to the first component */
++output_row;
}
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
{
aindex = -1;
++input_row; /* To point to the first component */
++output_row;
}
else
# endif
aindex = channels;
else
# endif
aindex = channels;
/* Use row_end in place of a loop counter: */
row_end = output_row + image->width * (channels+1);
@ -1960,7 +1731,7 @@ png_write_image_8bit(png_voidp argument)
} /* while out_ptr < row_end */
png_write_row(png_ptr, png_voidcast(png_const_bytep,
display->local_row));
display->local_row));
input_row += display->row_bytes/(sizeof (png_uint_16));
} /* while y */
}
@ -1999,25 +1770,25 @@ png_image_set_PLTE(png_image_write_control *display)
const png_imagep image = display->image;
const void *cmap = display->colormap;
const int entries = image->colormap_entries > 256 ? 256 :
(int)image->colormap_entries;
(int)image->colormap_entries;
/* NOTE: the caller must check for cmap != NULL and entries != 0 */
const png_uint_32 format = image->format;
const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format);
# if defined(PNG_FORMAT_BGR_SUPPORTED) &&\
# if defined(PNG_FORMAT_BGR_SUPPORTED) &&\
defined(PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED)
const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
(format & PNG_FORMAT_FLAG_ALPHA) != 0;
# else
(format & PNG_FORMAT_FLAG_ALPHA) != 0;
# else
# define afirst 0
# endif
# endif
# ifdef PNG_FORMAT_BGR_SUPPORTED
# ifdef PNG_FORMAT_BGR_SUPPORTED
const int bgr = (format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
# else
# else
# define bgr 0
# endif
# endif
int i, num_trans;
png_color palette[256];
@ -2042,11 +1813,11 @@ png_image_set_PLTE(png_image_write_control *display)
if (channels >= 3) /* RGB */
{
palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
entry[(2 ^ bgr)]);
entry[(2 ^ bgr)]);
palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
entry[1]);
entry[1]);
palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
entry[bgr]);
entry[bgr]);
}
else /* Gray */
@ -2122,12 +1893,12 @@ png_image_set_PLTE(png_image_write_control *display)
}
}
# ifdef afirst
# ifdef afirst
# undef afirst
# endif
# ifdef bgr
# endif
# ifdef bgr
# undef bgr
# endif
# endif
png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette,
entries);
@ -2155,10 +1926,10 @@ png_image_write_main(png_voidp argument)
int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA);
int write_16bit = linear && !colormap && (display->convert_to_8bit == 0);
# ifdef PNG_BENIGN_ERRORS_SUPPORTED
# ifdef PNG_BENIGN_ERRORS_SUPPORTED
/* Make sure we error out on any bad situation */
png_set_benign_errors(png_ptr, 0/*error*/);
# endif
# endif
/* Default the 'row_stride' parameter if required. */
if (display->row_stride == 0)
@ -2227,7 +1998,7 @@ png_image_write_main(png_voidp argument)
/* Now set up the data transformations (*after* the header is written),
* remove the handled transformations from the 'format' flags for checking.
*
* First check for a little endian system if writing 16 bit files.
* First check for a little endian system if writing 16-bit files.
*/
if (write_16bit != 0)
{
@ -2237,23 +2008,23 @@ png_image_write_main(png_voidp argument)
png_set_swap(png_ptr);
}
# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
if ((format & PNG_FORMAT_FLAG_BGR) != 0)
{
if (colormap == 0 && (format & PNG_FORMAT_FLAG_COLOR) != 0)
png_set_bgr(png_ptr);
format &= ~PNG_FORMAT_FLAG_BGR;
}
# endif
# endif
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
{
if (colormap == 0 && (format & PNG_FORMAT_FLAG_ALPHA) != 0)
png_set_swap_alpha(png_ptr);
format &= ~PNG_FORMAT_FLAG_AFIRST;
}
# endif
# endif
/* If there are 16 or fewer color-map entries we wrote a lower bit depth
* above, but the application data is still byte packed.
@ -2289,9 +2060,9 @@ png_image_write_main(png_voidp argument)
* it about 50 times. The speed-up in pngstest was about 10-20% of the
* total (user) time on a heavily loaded system.
*/
#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
# ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
png_set_compression_level(png_ptr, 3);
#endif
# endif
}
/* Check for the cases that currently require a pre-transform on the row
@ -2454,6 +2225,6 @@ png_image_write_to_file(png_imagep image, const char *file_name,
else
return 0;
}
#endif /* STDIO */
# endif /* STDIO */
#endif /* SIMPLIFIED_WRITE */
#endif /* WRITE */

16
thirdparty/libpng/pngwtran.c vendored
View File

@ -1,8 +1,8 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.18 [July 23, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 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.)
*
@ -71,7 +71,8 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
case 2:
{
png_bytep sp, dp;
int shift, v;
unsigned int shift;
int v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@ -110,7 +111,8 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
case 4:
{
png_bytep sp, dp;
int shift, v;
unsigned int shift;
int v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
@ -422,7 +424,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*(dp++) = *(sp++);
*/
sp+=3; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
*dp = (png_byte)(255 - *(sp++));
}
}
@ -446,7 +448,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*/
sp+=6; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
*(dp++) = (png_byte)(255 - *(sp++));
*dp = (png_byte)(255 - *(sp++));
}
}
#endif /* WRITE_16BIT */
@ -484,7 +486,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
*/
sp+=2; dp = sp;
*(dp++) = (png_byte)(255 - *(sp++));
*(dp++) = (png_byte)(255 - *(sp++));
*dp = (png_byte)(255 - *(sp++));
}
}
#endif /* WRITE_16BIT */

964
thirdparty/libpng/pngwutil.c vendored
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