--- name: "Image::PNG::Const" section: "3pm" platform: "linux" package: "libimage-png-libpng-perl" version: "0.59-1" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/Image::PNG::Const" --- # Image::PNG::Const(3pm) Constants for libpng ## NAME Image::PNG::Const - Constants for libpng ## SYNOPSIS ``` # Get just 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 is a helper for Image::PNG::Libpng. It contains no functions, only constants. ## CONSTANTS This file contains the following constants, from the header file of the PNG library, `"png.h"`: - PNG\_AFTER\_IDAT PNG\_AFTER\_IDAT has value 0x08. - PNG\_ALL\_FILTERS PNG\_ALL\_FILTERS has value ((0x08 \| 0x10 \| 0x20) \| 0x40 \| 0x80). - PNG\_ALL\_MNG\_FEATURES PNG\_ALL\_MNG\_FEATURES has value 0x05. - PNG\_ALPHA\_ASSOCIATED PNG\_ALPHA\_ASSOCIATED has value 1. - PNG\_ALPHA\_BROKEN PNG\_ALPHA\_BROKEN has value 3. - PNG\_ALPHA\_OPTIMIZED PNG\_ALPHA\_OPTIMIZED has value 2. - PNG\_ALPHA\_PNG PNG\_ALPHA\_PNG has value 0. - PNG\_ALPHA\_PREMULTIPLIED PNG\_ALPHA\_PREMULTIPLIED has value 1. - PNG\_ALPHA\_STANDARD PNG\_ALPHA\_STANDARD has value 1. - PNG\_ARM\_NEON PNG\_ARM\_NEON has value 0. - PNG\_BACKGROUND\_GAMMA\_FILE PNG\_BACKGROUND\_GAMMA\_FILE has value 2. - PNG\_BACKGROUND\_GAMMA\_SCREEN PNG\_BACKGROUND\_GAMMA\_SCREEN has value 1. - PNG\_BACKGROUND\_GAMMA\_UNIQUE PNG\_BACKGROUND\_GAMMA\_UNIQUE has value 3. - PNG\_BACKGROUND\_GAMMA\_UNKNOWN PNG\_BACKGROUND\_GAMMA\_UNKNOWN has value 0. - PNG\_BLEND\_OP\_OVER PNG\_BLEND\_OP\_OVER has value 0x01. - PNG\_BLEND\_OP\_SOURCE PNG\_BLEND\_OP\_SOURCE has value 0x00. - PNG\_COLOR\_MASK\_ALPHA PNG\_COLOR\_MASK\_ALPHA has value 4. - PNG\_COLOR\_MASK\_COLOR PNG\_COLOR\_MASK\_COLOR has value 2. - PNG\_COLOR\_MASK\_PALETTE PNG\_COLOR\_MASK\_PALETTE has value 1. - PNG\_COLOR\_TYPE\_GA PNG\_COLOR\_TYPE\_GA has value (4). - PNG\_COLOR\_TYPE\_GRAY PNG\_COLOR\_TYPE\_GRAY has value 0. - PNG\_COLOR\_TYPE\_GRAY\_ALPHA PNG\_COLOR\_TYPE\_GRAY\_ALPHA has value (4). - PNG\_COLOR\_TYPE\_PALETTE PNG\_COLOR\_TYPE\_PALETTE has value (2 \| 1). - PNG\_COLOR\_TYPE\_RGB PNG\_COLOR\_TYPE\_RGB has value (2). - PNG\_COLOR\_TYPE\_RGBA PNG\_COLOR\_TYPE\_RGBA has value (2 \| 4). - PNG\_COLOR\_TYPE\_RGB\_ALPHA PNG\_COLOR\_TYPE\_RGB\_ALPHA has value (2 \| 4). - PNG\_COMPRESSION\_TYPE\_BASE PNG\_COMPRESSION\_TYPE\_BASE has value 0. - PNG\_COMPRESSION\_TYPE\_DEFAULT PNG\_COMPRESSION\_TYPE\_DEFAULT has value 0. - PNG\_CRC\_DEFAULT PNG\_CRC\_DEFAULT has value 0. - PNG\_CRC\_ERROR\_QUIT PNG\_CRC\_ERROR\_QUIT has value 1. - PNG\_CRC\_NO\_CHANGE PNG\_CRC\_NO\_CHANGE has value 5. - PNG\_CRC\_QUIET\_USE PNG\_CRC\_QUIET\_USE has value 4. - PNG\_CRC\_WARN\_DISCARD PNG\_CRC\_WARN\_DISCARD has value 2. - PNG\_CRC\_WARN\_USE PNG\_CRC\_WARN\_USE has value 3. - PNG\_DEFAULT\_sRGB PNG\_DEFAULT\_sRGB has value -1. - PNG\_DISPOSE\_OP\_BACKGROUND PNG\_DISPOSE\_OP\_BACKGROUND has value 0x01. - PNG\_DISPOSE\_OP\_NONE PNG\_DISPOSE\_OP\_NONE has value 0x00. - PNG\_DISPOSE\_OP\_PREVIOUS PNG\_DISPOSE\_OP\_PREVIOUS has value 0x02. - PNG\_EQUATION\_ARBITRARY PNG\_EQUATION\_ARBITRARY has value 2. - PNG\_EQUATION\_BASE\_E PNG\_EQUATION\_BASE\_E has value 1. - PNG\_EQUATION\_HYPERBOLIC PNG\_EQUATION\_HYPERBOLIC has value 3. - PNG\_EQUATION\_LINEAR PNG\_EQUATION\_LINEAR has value 0. - PNG\_ERROR\_ACTION\_ERROR PNG\_ERROR\_ACTION\_ERROR has value 3. - PNG\_ERROR\_ACTION\_NONE PNG\_ERROR\_ACTION\_NONE has value 1. - PNG\_ERROR\_ACTION\_WARN PNG\_ERROR\_ACTION\_WARN has value 2. - PNG\_FAST\_FILTERS PNG\_FAST\_FILTERS has value (0x08 \| 0x10 \| 0x20). - PNG\_FILLER\_AFTER PNG\_FILLER\_AFTER has value 1. - PNG\_FILLER\_BEFORE PNG\_FILLER\_BEFORE has value 0. - PNG\_FILTER\_AVG PNG\_FILTER\_AVG has value 0x40. - PNG\_FILTER\_HEURISTIC\_DEFAULT PNG\_FILTER\_HEURISTIC\_DEFAULT has value 0. - PNG\_FILTER\_HEURISTIC\_UNWEIGHTED PNG\_FILTER\_HEURISTIC\_UNWEIGHTED has value 1. - PNG\_FILTER\_HEURISTIC\_WEIGHTED PNG\_FILTER\_HEURISTIC\_WEIGHTED has value 2. - PNG\_FILTER\_NONE PNG\_FILTER\_NONE has value 0x08. - PNG\_FILTER\_PAETH PNG\_FILTER\_PAETH has value 0x80. - PNG\_FILTER\_SUB PNG\_FILTER\_SUB has value 0x10. - PNG\_FILTER\_TYPE\_BASE PNG\_FILTER\_TYPE\_BASE has value 0. - PNG\_FILTER\_TYPE\_DEFAULT PNG\_FILTER\_TYPE\_DEFAULT has value 0. - PNG\_FILTER\_UP PNG\_FILTER\_UP has value 0x20. - PNG\_FILTER\_VALUE\_AVG PNG\_FILTER\_VALUE\_AVG has value 3. - PNG\_FILTER\_VALUE\_NONE PNG\_FILTER\_VALUE\_NONE has value 0. - PNG\_FILTER\_VALUE\_PAETH PNG\_FILTER\_VALUE\_PAETH has value 4. - PNG\_FILTER\_VALUE\_SUB PNG\_FILTER\_VALUE\_SUB has value 1. - PNG\_FILTER\_VALUE\_UP PNG\_FILTER\_VALUE\_UP has value 2. - PNG\_FLAG\_MNG\_EMPTY\_PLTE PNG\_FLAG\_MNG\_EMPTY\_PLTE has value 0x01. - PNG\_FLAG\_MNG\_FILTER\_64 PNG\_FLAG\_MNG\_FILTER\_64 has value 0x04. - PNG\_FORMAT\_ABGR PNG\_FORMAT\_ABGR has value (((0x02\|0x10)\|0x01)\|0x20). - PNG\_FORMAT\_ABGR\_COLORMAP PNG\_FORMAT\_ABGR\_COLORMAP has value ((((0x02\|0x10)\|0x01)\|0x20)\|0x08). - PNG\_FORMAT\_AG PNG\_FORMAT\_AG has value (0x01\|0x20). - PNG\_FORMAT\_ARGB PNG\_FORMAT\_ARGB has value ((0x02\|0x01)\|0x20). - PNG\_FORMAT\_ARGB\_COLORMAP PNG\_FORMAT\_ARGB\_COLORMAP has value (((0x02\|0x01)\|0x20)\|0x08). - PNG\_FORMAT\_BGR PNG\_FORMAT\_BGR has value (0x02\|0x10). - PNG\_FORMAT\_BGRA PNG\_FORMAT\_BGRA has value ((0x02\|0x10)\|0x01). - PNG\_FORMAT\_BGRA\_COLORMAP PNG\_FORMAT\_BGRA\_COLORMAP has value (((0x02\|0x10)\|0x01)\|0x08). - PNG\_FORMAT\_BGR\_COLORMAP PNG\_FORMAT\_BGR\_COLORMAP has value ((0x02\|0x10)\|0x08). - PNG\_FORMAT\_FLAG\_AFIRST PNG\_FORMAT\_FLAG\_AFIRST has value 0x20. - PNG\_FORMAT\_FLAG\_ALPHA PNG\_FORMAT\_FLAG\_ALPHA has value 0x01. - PNG\_FORMAT\_FLAG\_ASSOCIATED\_ALPHA PNG\_FORMAT\_FLAG\_ASSOCIATED\_ALPHA has value 0x40. - PNG\_FORMAT\_FLAG\_BGR PNG\_FORMAT\_FLAG\_BGR has value 0x10. - PNG\_FORMAT\_FLAG\_COLOR PNG\_FORMAT\_FLAG\_COLOR has value 0x02. - PNG\_FORMAT\_FLAG\_COLORMAP PNG\_FORMAT\_FLAG\_COLORMAP has value 0x08. - PNG\_FORMAT\_FLAG\_LINEAR PNG\_FORMAT\_FLAG\_LINEAR has value 0x04. - PNG\_FORMAT\_GA PNG\_FORMAT\_GA has value 0x01. - PNG\_FORMAT\_GRAY PNG\_FORMAT\_GRAY has value 0. - PNG\_FORMAT\_LINEAR\_RGB PNG\_FORMAT\_LINEAR\_RGB has value (0x04\|0x02). - PNG\_FORMAT\_LINEAR\_Y PNG\_FORMAT\_LINEAR\_Y has value 0x04. - PNG\_FORMAT\_LINEAR\_Y\_ALPHA PNG\_FORMAT\_LINEAR\_Y\_ALPHA has value (0x04\|0x01). - PNG\_FORMAT\_RGB PNG\_FORMAT\_RGB has value 0x02. - PNG\_FORMAT\_RGBA PNG\_FORMAT\_RGBA has value (0x02\|0x01). - PNG\_FORMAT\_RGBA\_COLORMAP PNG\_FORMAT\_RGBA\_COLORMAP has value ((0x02\|0x01)\|0x08). - PNG\_FORMAT\_RGB\_COLORMAP PNG\_FORMAT\_RGB\_COLORMAP has value (0x02\|0x08). - PNG\_FP\_1 PNG\_FP\_1 has value 100000. - PNG\_FP\_HALF PNG\_FP\_HALF has value 50000. - PNG\_FP\_MIN PNG\_FP\_MIN has value (-PNG\_FP\_MAX). - PNG\_FREE\_ALL PNG\_FREE\_ALL has value 0xffff. - PNG\_FREE\_EXIF PNG\_FREE\_EXIF has value 0x8000. - PNG\_FREE\_HIST PNG\_FREE\_HIST has value 0x0008. - PNG\_FREE\_ICCP PNG\_FREE\_ICCP has value 0x0010. - PNG\_FREE\_MUL PNG\_FREE\_MUL has value 0x4220. - PNG\_FREE\_PCAL PNG\_FREE\_PCAL has value 0x0080. - PNG\_FREE\_PLTE PNG\_FREE\_PLTE has value 0x1000. - PNG\_FREE\_ROWS PNG\_FREE\_ROWS has value 0x0040. - PNG\_FREE\_SCAL PNG\_FREE\_SCAL has value 0x0100. - PNG\_FREE\_SPLT PNG\_FREE\_SPLT has value 0x0020. - PNG\_FREE\_TEXT PNG\_FREE\_TEXT has value 0x4000. - PNG\_FREE\_TRNS PNG\_FREE\_TRNS has value 0x2000. - PNG\_FREE\_UNKN PNG\_FREE\_UNKN has value 0x0200. - PNG\_GAMMA\_LINEAR PNG\_GAMMA\_LINEAR has value 100000. - PNG\_GAMMA\_MAC\_18 PNG\_GAMMA\_MAC\_18 has value -2. - PNG\_GAMMA\_THRESHOLD PNG\_GAMMA\_THRESHOLD has value (PNG\_GAMMA\_THRESHOLD\_FIXED\*.00001). - PNG\_GAMMA\_sRGB PNG\_GAMMA\_sRGB has value 220000. - PNG\_HANDLE\_CHUNK\_ALWAYS PNG\_HANDLE\_CHUNK\_ALWAYS has value 3. - PNG\_HANDLE\_CHUNK\_AS\_DEFAULT PNG\_HANDLE\_CHUNK\_AS\_DEFAULT has value 0. - PNG\_HANDLE\_CHUNK\_IF\_SAFE PNG\_HANDLE\_CHUNK\_IF\_SAFE has value 2. - PNG\_HANDLE\_CHUNK\_NEVER PNG\_HANDLE\_CHUNK\_NEVER has value 1. - PNG\_HAVE\_IHDR PNG\_HAVE\_IHDR has value 0x01. - PNG\_HAVE\_PLTE PNG\_HAVE\_PLTE has value 0x02. - PNG\_IGNORE\_ADLER32 PNG\_IGNORE\_ADLER32 has value 8. - PNG\_IMAGE\_ERROR PNG\_IMAGE\_ERROR has value 2. - PNG\_IMAGE\_FLAG\_16BIT\_sRGB PNG\_IMAGE\_FLAG\_16BIT\_sRGB has value 0x04. - PNG\_IMAGE\_FLAG\_COLORSPACE\_NOT\_sRGB PNG\_IMAGE\_FLAG\_COLORSPACE\_NOT\_sRGB has value 0x01. - PNG\_IMAGE\_FLAG\_FAST PNG\_IMAGE\_FLAG\_FAST has value 0x02. - PNG\_IMAGE\_VERSION PNG\_IMAGE\_VERSION has value 1. - PNG\_IMAGE\_WARNING PNG\_IMAGE\_WARNING has value 1. - PNG\_INFO\_IDAT PNG\_INFO\_IDAT has value 0x8000. - PNG\_INFO\_PLTE PNG\_INFO\_PLTE has value 0x0008. - PNG\_INFO\_acTL PNG\_INFO\_acTL has value 0x40000. - PNG\_INFO\_bKGD PNG\_INFO\_bKGD has value 0x0020. - PNG\_INFO\_cHRM PNG\_INFO\_cHRM has value 0x0004. - PNG\_INFO\_cICP PNG\_INFO\_cICP has value 0x20000. - PNG\_INFO\_eXIf PNG\_INFO\_eXIf has value 0x10000. - PNG\_INFO\_fcTL PNG\_INFO\_fcTL has value 0x80000. - PNG\_INFO\_gAMA PNG\_INFO\_gAMA has value 0x0001. - PNG\_INFO\_hIST PNG\_INFO\_hIST has value 0x0040. - PNG\_INFO\_iCCP PNG\_INFO\_iCCP has value 0x1000. - PNG\_INFO\_oFFs PNG\_INFO\_oFFs has value 0x0100. - PNG\_INFO\_pCAL PNG\_INFO\_pCAL has value 0x0400. - PNG\_INFO\_pHYs PNG\_INFO\_pHYs has value 0x0080. - PNG\_INFO\_sBIT PNG\_INFO\_sBIT has value 0x0002. - PNG\_INFO\_sCAL PNG\_INFO\_sCAL has value 0x4000. - PNG\_INFO\_sPLT PNG\_INFO\_sPLT has value 0x2000. - PNG\_INFO\_sRGB PNG\_INFO\_sRGB has value 0x0800. - PNG\_INFO\_tIME PNG\_INFO\_tIME has value 0x0200. - PNG\_INFO\_tRNS PNG\_INFO\_tRNS has value 0x0010. - PNG\_INTERLACE\_ADAM7 PNG\_INTERLACE\_ADAM7 has value 1. - PNG\_INTERLACE\_ADAM7\_PASSES PNG\_INTERLACE\_ADAM7\_PASSES has value 7. - PNG\_INTERLACE\_NONE PNG\_INTERLACE\_NONE has value 0. - PNG\_INTRAPIXEL\_DIFFERENCING PNG\_INTRAPIXEL\_DIFFERENCING has value 64. - PNG\_IO\_CHUNK\_CRC PNG\_IO\_CHUNK\_CRC has value 0x0080. - PNG\_IO\_CHUNK\_DATA PNG\_IO\_CHUNK\_DATA has value 0x0040. - PNG\_IO\_CHUNK\_HDR PNG\_IO\_CHUNK\_HDR has value 0x0020. - PNG\_IO\_MASK\_LOC PNG\_IO\_MASK\_LOC has value 0x00f0. - PNG\_IO\_MASK\_OP PNG\_IO\_MASK\_OP has value 0x000f. - PNG\_IO\_NONE PNG\_IO\_NONE has value 0x0000. - PNG\_IO\_READING PNG\_IO\_READING has value 0x0001. - PNG\_IO\_SIGNATURE PNG\_IO\_SIGNATURE has value 0x0010. - PNG\_IO\_WRITING PNG\_IO\_WRITING has value 0x0002. - PNG\_ITXT\_COMPRESSION\_NONE PNG\_ITXT\_COMPRESSION\_NONE has value 1. - PNG\_ITXT\_COMPRESSION\_zTXt PNG\_ITXT\_COMPRESSION\_zTXt has value 2. - PNG\_KEYWORD\_MAX\_LENGTH PNG\_KEYWORD\_MAX\_LENGTH has value 79. - PNG\_MAXIMUM\_INFLATE\_WINDOW PNG\_MAXIMUM\_INFLATE\_WINDOW has value 2. - PNG\_MAX\_PALETTE\_LENGTH PNG\_MAX\_PALETTE\_LENGTH has value 256. - PNG\_MIPS\_MMI PNG\_MIPS\_MMI has value 12. - PNG\_MIPS\_MSA PNG\_MIPS\_MSA has value 6. - PNG\_NO\_FILTERS PNG\_NO\_FILTERS has value 0x00. - PNG\_OFFSET\_MICROMETER PNG\_OFFSET\_MICROMETER has value 1. - PNG\_OFFSET\_PIXEL PNG\_OFFSET\_PIXEL has value 0. - PNG\_OPTION\_INVALID PNG\_OPTION\_INVALID has value 1. - PNG\_OPTION\_NEXT PNG\_OPTION\_NEXT has value 14. - PNG\_OPTION\_OFF PNG\_OPTION\_OFF has value 2. - PNG\_OPTION\_ON PNG\_OPTION\_ON has value 3. - PNG\_OPTION\_UNSET PNG\_OPTION\_UNSET has value 0. - PNG\_POWERPC\_VSX PNG\_POWERPC\_VSX has value 10. - PNG\_RESOLUTION\_METER PNG\_RESOLUTION\_METER has value 1. - PNG\_RESOLUTION\_UNKNOWN PNG\_RESOLUTION\_UNKNOWN has value 0. - PNG\_RGB\_TO\_GRAY\_DEFAULT PNG\_RGB\_TO\_GRAY\_DEFAULT has value (-1). - PNG\_SCALE\_METER PNG\_SCALE\_METER has value 1. - PNG\_SCALE\_RADIAN PNG\_SCALE\_RADIAN has value 2. - PNG\_SCALE\_UNKNOWN PNG\_SCALE\_UNKNOWN has value 0. - PNG\_SKIP\_sRGB\_CHECK\_PROFILE PNG\_SKIP\_sRGB\_CHECK\_PROFILE has value 4. - PNG\_TEXT\_COMPRESSION\_NONE PNG\_TEXT\_COMPRESSION\_NONE has value -1. - PNG\_TEXT\_COMPRESSION\_NONE\_WR PNG\_TEXT\_COMPRESSION\_NONE\_WR has value -3. - PNG\_TEXT\_COMPRESSION\_zTXt PNG\_TEXT\_COMPRESSION\_zTXt has value 0. - PNG\_TEXT\_COMPRESSION\_zTXt\_WR PNG\_TEXT\_COMPRESSION\_zTXt\_WR has value -2. - PNG\_TRANSFORM\_BGR PNG\_TRANSFORM\_BGR has value 0x0080. - PNG\_TRANSFORM\_EXPAND PNG\_TRANSFORM\_EXPAND has value 0x0010. - PNG\_TRANSFORM\_EXPAND\_16 PNG\_TRANSFORM\_EXPAND\_16 has value 0x4000. - PNG\_TRANSFORM\_GRAY\_TO\_RGB PNG\_TRANSFORM\_GRAY\_TO\_RGB has value 0x2000. - PNG\_TRANSFORM\_IDENTITY PNG\_TRANSFORM\_IDENTITY has value 0x0000. - PNG\_TRANSFORM\_INVERT\_ALPHA PNG\_TRANSFORM\_INVERT\_ALPHA has value 0x0400. - PNG\_TRANSFORM\_INVERT\_MONO PNG\_TRANSFORM\_INVERT\_MONO has value 0x0020. - PNG\_TRANSFORM\_PACKING PNG\_TRANSFORM\_PACKING has value 0x0004. - PNG\_TRANSFORM\_PACKSWAP PNG\_TRANSFORM\_PACKSWAP has value 0x0008. - PNG\_TRANSFORM\_SCALE\_16 PNG\_TRANSFORM\_SCALE\_16 has value 0x8000. - PNG\_TRANSFORM\_SHIFT PNG\_TRANSFORM\_SHIFT has value 0x0040. - PNG\_TRANSFORM\_STRIP\_16 PNG\_TRANSFORM\_STRIP\_16 has value 0x0001. - PNG\_TRANSFORM\_STRIP\_ALPHA PNG\_TRANSFORM\_STRIP\_ALPHA has value 0x0002. - PNG\_TRANSFORM\_STRIP\_FILLER PNG\_TRANSFORM\_STRIP\_FILLER has value 0x0800. - PNG\_TRANSFORM\_STRIP\_FILLER\_AFTER PNG\_TRANSFORM\_STRIP\_FILLER\_AFTER has value 0x1000. - PNG\_TRANSFORM\_STRIP\_FILLER\_BEFORE PNG\_TRANSFORM\_STRIP\_FILLER\_BEFORE has value 0x0800. - PNG\_TRANSFORM\_SWAP\_ALPHA PNG\_TRANSFORM\_SWAP\_ALPHA has value 0x0100. - PNG\_TRANSFORM\_SWAP\_ENDIAN PNG\_TRANSFORM\_SWAP\_ENDIAN has value 0x0200. - PNG\_sRGB\_INTENT\_ABSOLUTE PNG\_sRGB\_INTENT\_ABSOLUTE has value 3. - PNG\_sRGB\_INTENT\_PERCEPTUAL PNG\_sRGB\_INTENT\_PERCEPTUAL has value 0. - PNG\_sRGB\_INTENT\_RELATIVE PNG\_sRGB\_INTENT\_RELATIVE has value 1. - PNG\_sRGB\_INTENT\_SATURATION PNG\_sRGB\_INTENT\_SATURATION has value 2. ## 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 generated from the file *png.h* supplied with version 1.6.45 of libpng. ## AUTHOR Ben Bullock, \ ## COPYRIGHT & LICENCE This package and associated files are copyright (C) 2011-2025 Ben Bullock. You can use, copy, modify and redistribute this package and associated files under the Perl Artistic Licence or the GNU General Public Licence.