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Image-PNG-0.20_02
River stage zero No dependents
++
/ Image::PNG::Const

NAME

Image::PNG::Const

SYNOPSIS

       # Get the constants you need:
       use Image::PNG::Const qw/PNG_TRANSFORM_INVERT_ALPHA
                               PNG_COLOR_MASK_ALPHA/;
       # Get everything:
       use Image::PNG::Const ':all';

This module contains no functions, only constants.

CONSTANTS

This file contains constants extracted from the header file of the PNG library, png.h. The constants in this file are

PNG_DISPOSE_OP_NONE = 0x00
PNG_DISPOSE_OP_BACKGROUND = 0x01
PNG_DISPOSE_OP_PREVIOUS = 0x02
PNG_BLEND_OP_SOURCE = 0x00
PNG_BLEND_OP_OVER = 0x01
PNG_TEXT_COMPRESSION_NONE_WR = -3
PNG_TEXT_COMPRESSION_zTXt_WR = -2
PNG_TEXT_COMPRESSION_NONE = -1
PNG_TEXT_COMPRESSION_zTXt = 0
PNG_ITXT_COMPRESSION_NONE = 1
PNG_ITXT_COMPRESSION_zTXt = 2
PNG_HAVE_IHDR = 0x01
PNG_HAVE_PLTE = 0x02
PNG_AFTER_IDAT = 0x08
PNG_FP_1 = 100000
PNG_FP_HALF = 50000
PNG_FP_MIN = (-PNG_FP_MAX)
PNG_COLOR_MASK_PALETTE = 1
PNG_COLOR_MASK_COLOR = 2
PNG_COLOR_MASK_ALPHA = 4
PNG_COLOR_TYPE_GRAY = 0
PNG_COLOR_TYPE_PALETTE = (2 | 1)
PNG_COLOR_TYPE_RGB = (2)
PNG_COLOR_TYPE_RGB_ALPHA = (2 | 4)
PNG_COLOR_TYPE_GRAY_ALPHA = (4)
PNG_COLOR_TYPE_RGBA = (2 | 4)
PNG_COLOR_TYPE_GA = (4)
PNG_COMPRESSION_TYPE_BASE = 0
PNG_COMPRESSION_TYPE_DEFAULT = 0
PNG_FILTER_TYPE_BASE = 0
PNG_INTRAPIXEL_DIFFERENCING = 64
PNG_FILTER_TYPE_DEFAULT = 0
PNG_INTERLACE_NONE = 0
PNG_INTERLACE_ADAM7 = 1
PNG_OFFSET_PIXEL = 0
PNG_OFFSET_MICROMETER = 1
PNG_EQUATION_LINEAR = 0
PNG_EQUATION_BASE_E = 1
PNG_EQUATION_ARBITRARY = 2
PNG_EQUATION_HYPERBOLIC = 3
PNG_SCALE_UNKNOWN = 0
PNG_SCALE_METER = 1
PNG_SCALE_RADIAN = 2
PNG_RESOLUTION_UNKNOWN = 0
PNG_RESOLUTION_METER = 1
PNG_sRGB_INTENT_PERCEPTUAL = 0
PNG_sRGB_INTENT_RELATIVE = 1
PNG_sRGB_INTENT_SATURATION = 2
PNG_sRGB_INTENT_ABSOLUTE = 3
PNG_KEYWORD_MAX_LENGTH = 79
PNG_MAX_PALETTE_LENGTH = 256
PNG_INFO_gAMA = 0x0001
PNG_INFO_sBIT = 0x0002
PNG_INFO_cHRM = 0x0004
PNG_INFO_PLTE = 0x0008
PNG_INFO_tRNS = 0x0010
PNG_INFO_bKGD = 0x0020
PNG_INFO_hIST = 0x0040
PNG_INFO_pHYs = 0x0080
PNG_INFO_oFFs = 0x0100
PNG_INFO_tIME = 0x0200
PNG_INFO_pCAL = 0x0400
PNG_INFO_sRGB = 0x0800
PNG_INFO_iCCP = 0x1000
PNG_INFO_sPLT = 0x2000
PNG_INFO_sCAL = 0x4000
PNG_INFO_IDAT = 0x8000
PNG_INFO_acTL = 0x10000
PNG_INFO_fcTL = 0x20000
PNG_TRANSFORM_IDENTITY = 0x0000
PNG_TRANSFORM_STRIP_16 = 0x0001
PNG_TRANSFORM_STRIP_ALPHA = 0x0002
PNG_TRANSFORM_PACKING = 0x0004
PNG_TRANSFORM_PACKSWAP = 0x0008
PNG_TRANSFORM_EXPAND = 0x0010
PNG_TRANSFORM_INVERT_MONO = 0x0020
PNG_TRANSFORM_SHIFT = 0x0040
PNG_TRANSFORM_BGR = 0x0080
PNG_TRANSFORM_SWAP_ALPHA = 0x0100
PNG_TRANSFORM_SWAP_ENDIAN = 0x0200
PNG_TRANSFORM_INVERT_ALPHA = 0x0400
PNG_TRANSFORM_STRIP_FILLER = 0x0800
PNG_TRANSFORM_STRIP_FILLER_BEFORE = 0x0800
PNG_TRANSFORM_STRIP_FILLER_AFTER = 0x1000
PNG_TRANSFORM_GRAY_TO_RGB = 0x2000
PNG_TRANSFORM_EXPAND_16 = 0x4000
PNG_TRANSFORM_SCALE_16 = 0x8000
PNG_FLAG_MNG_EMPTY_PLTE = 0x01
PNG_FLAG_MNG_FILTER_64 = 0x04
PNG_ALL_MNG_FEATURES = 0x05
PNG_ERROR_ACTION_NONE = 1
PNG_ERROR_ACTION_WARN = 2
PNG_ERROR_ACTION_ERROR = 3
PNG_RGB_TO_GRAY_DEFAULT = (-1)
PNG_ALPHA_PNG = 0
PNG_ALPHA_STANDARD = 1
PNG_ALPHA_ASSOCIATED = 1
PNG_ALPHA_PREMULTIPLIED = 1
PNG_ALPHA_OPTIMIZED = 2
PNG_ALPHA_BROKEN = 3
PNG_DEFAULT_sRGB = -1
PNG_GAMMA_MAC_18 = -2
PNG_GAMMA_sRGB = 220000
PNG_GAMMA_LINEAR = 100000
PNG_READ_16_TO_8 = SUPPORTED
PNG_GAMMA_THRESHOLD = (PNG_GAMMA_THRESHOLD_FIXED*.00001)
PNG_CRC_DEFAULT = 0
PNG_CRC_ERROR_QUIT = 1
PNG_CRC_WARN_DISCARD = 2
PNG_CRC_WARN_USE = 3
PNG_CRC_QUIET_USE = 4
PNG_CRC_NO_CHANGE = 5
PNG_NO_FILTERS = 0x00
PNG_FILTER_NONE = 0x08
PNG_FILTER_SUB = 0x10
PNG_FILTER_UP = 0x20
PNG_FILTER_AVG = 0x40
PNG_FILTER_PAETH = 0x80
PNG_ALL_FILTERS = (0x08 | 0x10 | 0x20 | 0x40 | 0x80)
PNG_FILTER_VALUE_NONE = 0
PNG_FILTER_VALUE_SUB = 1
PNG_FILTER_VALUE_UP = 2
PNG_FILTER_VALUE_AVG = 3
PNG_FILTER_VALUE_PAETH = 4
PNG_FILTER_HEURISTIC_DEFAULT = 0
PNG_FILTER_HEURISTIC_UNWEIGHTED = 1
PNG_FILTER_HEURISTIC_WEIGHTED = 2
PNG_DESTROY_WILL_FREE_DATA = 1
PNG_SET_WILL_FREE_DATA = 1
PNG_USER_WILL_FREE_DATA = 2
PNG_FREE_HIST = 0x0008
PNG_FREE_ICCP = 0x0010
PNG_FREE_SPLT = 0x0020
PNG_FREE_ROWS = 0x0040
PNG_FREE_PCAL = 0x0080
PNG_FREE_SCAL = 0x0100
PNG_FREE_UNKN = 0x0200
PNG_FREE_LIST = 0x0400
PNG_FREE_PLTE = 0x1000
PNG_FREE_TRNS = 0x2000
PNG_FREE_TEXT = 0x4000
PNG_FREE_ALL = 0x7fff
PNG_FREE_MUL = 0x4220
PNG_HANDLE_CHUNK_AS_DEFAULT = 0
PNG_HANDLE_CHUNK_NEVER = 1
PNG_HANDLE_CHUNK_IF_SAFE = 2
PNG_HANDLE_CHUNK_ALWAYS = 3
PNG_INTERLACE_ADAM7_PASSES = 7

EXPORTS

Nothing is exported by default, but all the symbols in this module can be exported on request. There is one export tag, 'all', which exports all the symbols in this module:

    use Image::PNG::Const ':all';

ABOUT THIS MODULE

This Perl module was automatically created from png.h. To rebuild it, run the script "strip-constants.pl" in the top directory of the Image::PNG distribution. You need to have the Template module installed. You may need to edit the script somewhat, depending on your environment.

The template for creating Const.pm is in directory tmpl in the Image::PNG distribution. Its name is Const.pm.tmpl.

AUTHOR

Ben Bullock, <bkb@cpan.org>

COPYRIGHT & LICENCE

The Image::PNG package and associated files are copyright (C) 2013 Ben Bullock.

You can use, copy, modify and redistribute Image::PNG and associated files under the Perl Artistic Licence or the GNU General Public Licence.

SUPPORT

Mailing list

There is a mailing list at http://groups.google.com/group/perlimagepng. It is not necessary to be a member of the list to post messages to the list or participate in discussions.

CPAN stuff

There is a bug tracker at https://github.com/benkasminbullock/Image-PNG/issues.

FOR PROGRAMMERS

The distributed files are not the source code of the module. The source code lives in the "tmpl" directory of the distribution and the distribution is created via scripts.