com
version
com
-com Copyright (c) 1998-2012 Glenn Randers-Pehrson
+com Copyright (c) 1998-2014 Glenn Randers-Pehrson
com
com This code is released under the libpng license.
com For conditions of distribution and use, see the disclaimer
logunsupported = 1
+# The following allows the output from configure to modify the contents of
+# pnglibconf.h
+
+@#ifdef HAVE_CONFIG_H
+@# include "config.h"
+@#endif
+
# PNG_USER_CONFIG has to be defined on the compiler command line
# to cause pngusr.h to be read while constructing pnglibconf.h
#
setting PREFIX
-# Default to using the read macros
-
-setting DEFAULT_READ_MACROS default 1
-
# Implementation specific control of the optimizations, enabled by those
# hardware or software options that need it (typically when run-time choices
# must be made by the user)
# ARM_NEON_API: (PNG_ARM_NEON == 1) allow the optimization to be switched on
# with png_set_option
# ARM_NEON_CHECK: (PNG_ARM_NEON == 1) compile a run-time check to see if Neon
-# extensions are supported, this is poorly supported and
-# deprectated - use the png_set_option API.
+# extensions are supported. This is poorly supported and
+# deprecated - use the png_set_option API.
setting ARM_NEON_OPT
option ARM_NEON_API disabled requires ALIGNED_MEMORY enables SET_OPTION,
sets ARM_NEON_OPT 1
sets ARM_NEON_OPT 1
# These settings configure the default compression level (0-9) and 'strategy';
-# strategy is as defined by the implementors of zlib, it describes the input
+# strategy is as defined by the implementors of zlib. It describes the input
# data and modifies the zlib parameters in an attempt to optimize the balance
# between search and huffman encoding in the zlib algorithms. The defaults are
# the zlib.h defaults - the apparently recursive definition does not arise
# because the name of the setting is prefixed by PNG_
#
# The TEXT values are the defaults when writing compressed text (all forms)
-#
-# Include the zlib header too, so that the defaults below are known
+
+# Include the zlib header so that the defaults below are known
@# include <zlib.h>
# The '@' here means to substitute the value when pnglibconf.h is built
setting Z_DEFAULT_COMPRESSION default @Z_DEFAULT_COMPRESSION
+# TODO: why aren't these Z_RLE; zlib.h says that Z_RLE, specifically, is
+# appropriate for PNG images, maybe it doesn't exist in all versions?
setting Z_DEFAULT_STRATEGY default @Z_FILTERED
setting Z_DEFAULT_NOFILTER_STRATEGY default @Z_DEFAULT_STRATEGY
setting ZLIB_VERNUM default @ZLIB_VERNUM
+# Linkage of:
+#
+# API: libpng API functions
+# CALLBACK: internal non-file-local callbacks
+# FUNCTION: internal non-file-local functions
+# DATA: internal non-file-local (const) data
+setting LINKAGE_API default extern
+setting LINKAGE_CALLBACK default extern
+setting LINKAGE_FUNCTION default extern
+setting LINKAGE_DATA default extern
+
setting TEXT_Z_DEFAULT_COMPRESSION default @Z_DEFAULT_COMPRESSION
setting TEXT_Z_DEFAULT_STRATEGY default @Z_DEFAULT_STRATEGY
+# Default to using the read macros
+
+setting DEFAULT_READ_MACROS default 1
+
# The alternative is to call functions to read PNG values, if
# the functions are turned *off* the read macros must always
# be enabled, so turning this off will actually force the
option MNG_FEATURES
# Arithmetic options, the first is the big switch that chooses between internal
-# floating and fixed point arithmetic implementations - it does not affect an
+# floating and fixed point arithmetic implementations - it does not affect any
# APIs. The second two (the _POINT settings) switch off individual APIs.
#
# Prior to libpng 1.6.8 one of the API (_POINT) variants had to be selected. At
option IO_STATE
-# This is only for PowerPC big-endian and 680x0 systems
-# some testing, not enabled by default.
-# NO LONGER USED
-
-#option READ_BIG_ENDIAN disabled
+# Libpng limits: limit the size of images and data on read.
+#
+# If this option is disabled all the limit checking code will be disabled:
-# Allow users to control limits on what the READ code will
-# read:
+option USER_LIMITS requires READ
-# Added at libpng-1.2.43; adds limit fields to png_struct,
-# allows some usages of these fields
+# The default settings given below for the limits mean that libpng will
+# limit the size of images or the size of data in ancilliary chunks to less
+# than the specification or implementation limits. Settings have the
+# following interpretations:
+#
+# USER_WIDTH_MAX: maximum width of an image that will be read
+# USER_HEIGHT_MAX: maximum height
+# USER_CHUNK_MALLOC_MAX: maximum in-memory (decompressed) size of a single chunk
+# USER_CHUNK_CACHE_MAX: maximum number of chunks to be cached
+#
+# Only chunks that are variable in number are counted towards the
-option USER_LIMITS
+# Use 0x7fffffff for unlimited
+setting USER_WIDTH_MAX default 1000000
+setting USER_HEIGHT_MAX default 1000000
-# Added at libpng-1.2.6; adds setting APIs, allows additional
-# usage of this field (UTSL)
+# Use 0 for unlimited
+setting USER_CHUNK_CACHE_MAX default 1000
+setting USER_CHUNK_MALLOC_MAX default 8000000
+# If this option is enabled APIs to set the above limits at run time are added;
+# without this the hardwired (compile time) limits will be used.
option SET_USER_LIMITS requires USER_LIMITS
-# Feature added at libpng-1.4.0, this flag added at 1.4.1
-option SET_USER_LIMITS enables SET_CHUNK_CACHE_LIMIT
-# Feature added at libpng-1.4.1, this flag added at 1.4.1
-
-option SET_USER_LIMITS enables SET_CHUNK_MALLOC_LIMIT
-
-# Libpng limits.
-#
-# If these settings are *not* set libpng will not limit the size of
-# images or the size of data in ancilliary chunks. This does lead to
-# security issues if PNG files come from untrusted sources.
-setting USER_WIDTH_MAX
-setting USER_HEIGHT_MAX
-setting USER_CHUNK_CACHE_MAX
-setting USER_CHUNK_MALLOC_MAX
-
-# To default all these settings to values that are large but probably
-# safe turn the SAFE_LIMITS option on; this will cause the value in
-# pngpriv.h to be used. Individual values can also be set, simply set
-# them in pngusr.dfa with '@#define PNG_setting value' lines.
-option SAFE_LIMITS enables USER_LIMITS disabled
-= SAFE_LIMITS SAFE_LIMITS
-
# All of the following options relate to code capabilities for
# processing image data before creating a PNG or after reading one.
# You can remove these capabilities safely and still be PNG
option WRITE_INTERLACING requires WRITE
-# The following depends, internally, on WEIGHT_SHIFT and COST_SHIFT
-# where are set below.
-
+# Deprecated, will be removed.
option WRITE_WEIGHTED_FILTER requires WRITE
option WRITE_FLUSH requires WRITE
# non-IDAT chunks (zTXt, iTXt, iCCP, and unknown chunks). This feature
# was added at libpng-1.5.3.
option WRITE_CUSTOMIZE_ZTXT_COMPRESSION requires WRITE
+option WRITE_CUSTOMIZE_COMPRESSION requires WRITE
# Any chunks you are not interested in, you can undef here. The
# ones that allocate memory may be expecially important (hIST,
# are only interested in 8 bits anyway. Increasing this value
# results in more memory being used, and more pow() functions
# being called to fill in the gamma tables. Don't set this value
-# less then 8, and even that may not work (I haven't tested it).
+# less than 8, and even that may not work (I haven't tested it).
setting MAX_GAMMA_8 default 11
setting GAMMA_THRESHOLD_FIXED default 5000
-# Scaling factor for filter heuristic weighting calculations
-
-setting WEIGHT_SHIFT default 8
-setting COST_SHIFT default 3
-
# Precision to use when converting a floating point value to a PNG
# extension format string in an sCAL chunk (only relevant if the
# floating point API is enabled)
chunk gAMA enables GAMMA
chunk hIST
chunk iCCP enables COLORSPACE, GAMMA
-chunk iTXt
+chunk iTXt enables TEXT
chunk oFFs
chunk pCAL
chunk pHYs
chunk sBIT
chunk sCAL
chunk sPLT
-chunk sRGB enables COLORSPACE, GAMMA
+chunk sRGB enables COLORSPACE, GAMMA, SET_OPTION
chunk tEXt requires TEXT
chunk tIME
chunk tRNS
-chunk zTXt
+chunk zTXt enables TEXT
# This only affects support of the optional PLTE chunk in RGB and RGBA
# images. Notice that READ_ANCILLARY_CHUNKS therefore disables part
option WRITE_OPTIMIZE_CMF requires WRITE
option READ_COMPRESSED_TEXT disabled
+option READ_iCCP enables READ_COMPRESSED_TEXT
option READ_iTXt enables READ_COMPRESSED_TEXT
option READ_zTXt enables READ_COMPRESSED_TEXT
-option READ_COMPRESSED_TEXT enables READ_TEXT
option WRITE_oFFs enables SAVE_INT_32
option WRITE_pCAL enables SAVE_INT_32
option WRITE_iCCP enables WRITE_COMPRESSED_TEXT
option WRITE_iTXt enables WRITE_COMPRESSED_TEXT
option WRITE_zTXt enables WRITE_COMPRESSED_TEXT
-option WRITE_COMPRESSED_TEXT enables WRITE_TEXT
# Turn this off to disable png_read_png() and png_write_png() and
# leave the row_pointers member out of the info structure.
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