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| author | William Joye <wjoye@cfa.harvard.edu> | 2016-10-27 19:39:39 (GMT) |
|---|---|---|
| committer | William Joye <wjoye@cfa.harvard.edu> | 2016-10-27 19:39:39 (GMT) |
| commit | ea28451286d3ea4a772fa174483f9a7a66bb1ab3 (patch) | |
| tree | 6ee9d8a7848333a7ceeee3b13d492e40225f8b86 /tcllib/modules/png | |
| parent | b5ca09bae0d6a1edce939eea03594dd56383f2c8 (diff) | |
| parent | 7c621da28f07e449ad90c387344f07a453927569 (diff) | |
| download | blt-ea28451286d3ea4a772fa174483f9a7a66bb1ab3.zip blt-ea28451286d3ea4a772fa174483f9a7a66bb1ab3.tar.gz blt-ea28451286d3ea4a772fa174483f9a7a66bb1ab3.tar.bz2 | |
Merge commit '7c621da28f07e449ad90c387344f07a453927569' as 'tcllib'
Diffstat (limited to 'tcllib/modules/png')
164 files changed, 1477 insertions, 0 deletions
diff --git a/tcllib/modules/png/ChangeLog b/tcllib/modules/png/ChangeLog new file mode 100644 index 0000000..91a83c0 --- /dev/null +++ b/tcllib/modules/png/ChangeLog @@ -0,0 +1,145 @@ +2013-02-01 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.15 ======================== + * + +2012-07-09 Aaron Faupell <afaupell@users.sourceforge.net> + + * png.tcl: add capability to read and write images from color lists + * png.tcl: make crc package optional in imageInfo + +2011-12-13 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.14 ======================== + * + +2011-01-24 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.13 ======================== + * + +2009-12-07 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.12 ======================== + * + +2008-12-12 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.11.1 ======================== + * + +2008-10-16 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.11 ======================== + * + +2008-06-14 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * png.pcx: New file. Syntax definitions for the public commands of + the png package. + +2007-09-12 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.10 ======================== + * + +2007-08-20 Andreas Kupries <andreask@activestate.com> + + * png.tcl: Bumped version of package to 0.1.2. + * png.man: + * pkgIndex.tcl: + +2007-04-30 Andreas Kupries <andreask@activestate.com> + + * png.test: Added tests for removeComments, also converted to use + of 'TestFilesGlob'. + +2004-04-28 Aaron Faupell <afaupell@users.sourceforge.net> + + * png.tcl: fixed output file encoding in removeComments + +2007-03-21 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * png.man: Fixed all warnings due to use of now deprecated + commands. Added a section about how to give feedback. + +2006-10-03 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.9 ======================== + * + +2006-01-23 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * png.test: More boilerplate simplified via use of test support. + +2006-01-19 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * png.test: Hooked into the new common test support code. + +2006-01-10 Andreas Kupries <andreask@activestate.com> + + * png.test: Fixed [SF Tcllib Bug 1316055]. Uncluttering test + output. + +2005-10-06 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.8 ======================== + * + +2005-08-25 Andreas Kupries <andreask@activestate.com> + + * png.tcl (::png::validate): Added forced truncation to 32bit when + * png.tcl (::png::imageInfo): reformatting a read negative crc to + unsigned. Otherwise this is becomes a 64bit unsigned, causing + bogus crc checksum failures. This fixes [Tcllib SF Bug 1042420]. + +2004-10-05 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * + * Released and tagged Tcllib 1.7 ======================== + * + +2004-09-22 Aaron Faupell <afaupell@users.sourceforge.net> + + * png.test: updated timestamp test to use gmt + +2004-08-25 Aaron Faupell <afaupell@users.sourceforge.net> + + * png.tcl bug fix in getTimestamp, made times be interpreted as gmt. + +2004-08-09 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * png.man: Spelling police. + * png.test: + +2004-05-22 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * png.tcl: Fixed a problem with the reading of crc data from png + files. The 'binary scan' may return a negative integer, but the + check is against unsigned data. Added code to check for this and + compute the proper unsigned number for correct comparison. + + * png.test: New file. A testsuite for the module. Incomplete. + Tests the validation, signature, retrieval of image information, + and of timestamps. The image files used are from the official + PNG testsuite. + +2004-05-20 Aaron Faupell <afaupell@users.sourceforge.net> + + * png.tcl: moved file opening and signature validation to + a seperate proc. added isPNG command. + * png.man: updated to include isPNG command + +2004-05-07 Andreas Kupries <andreas_kupries@users.sourceforge.net> + + * New module for querying PNG images, and manipulating their + comments, and timestamp. diff --git a/tcllib/modules/png/pkgIndex.tcl b/tcllib/modules/png/pkgIndex.tcl new file mode 100644 index 0000000..548da9a --- /dev/null +++ b/tcllib/modules/png/pkgIndex.tcl @@ -0,0 +1,2 @@ +if {![package vsatisfies [package provide Tcl] 8.2]} {return} +package ifneeded png 0.2 [list source [file join $dir png.tcl]] diff --git a/tcllib/modules/png/png.man b/tcllib/modules/png/png.man new file mode 100644 index 0000000..e65a651 --- /dev/null +++ b/tcllib/modules/png/png.man @@ -0,0 +1,141 @@ +[manpage_begin png n 0.1.2] +[keywords comment] +[keywords image] +[keywords png] +[keywords timestamp] +[copyright {2004, Code: Aaron Faupell <afaupell@users.sourceforge.net>}] +[copyright {2004, Doc: Andreas Kupries <andreas_kupries@users.sourceforge.net>}] +[moddesc {Image manipulation}] +[titledesc {PNG querying and manipulation of meta data}] +[category {File formats}] +[require Tcl 8.2] +[require crc32] +[require png [opt 0.1.2]] +[description] +[para] + +This package provides commands to query and modify PNG images. PNG +stands for [term {Portable Network Graphics}] and is specified at +[uri http://www.libpng.org/pub/png/spec/1.2]. + +[section COMMANDS] +[list_begin definitions] +[call [cmd ::png::validate] [arg file]] + +Returns a value indicating if [arg file] is a valid PNG file. The file +is checked for PNG signature, each chunks checksum is verified, +existence of a data chunk is verified, first chunk is checked for +header, last chunk is checked for ending. Things [emph not] checked +for are: validity of values within a chunk, multiple header chunks, +noncontiguous data chunks, end chunk before actual eof. This procedure +can take lots of time. + +[para] +Possible return values: + +[list_begin definitions] +[def OK] +File is a valid PNG file. +[def SIG] +no/broken PNG signature. +[def BADLEN] +corrupt chunk length. +[def EOF] +premature end of file. +[def NOHDR] +missing header chunk. +[def CKSUM] +crc mismatch. +[def NODATA] +missing data chunk(s). +[def NOEND] +missing end marker. +[list_end] + +[call [cmd ::png::isPNG] [arg file]] + +Returns a boolean value indicating if the file [arg file] starts with +a PNG signature. This is a much faster and less intensive check than +[cmd ::png::validate] as it does not check if the PNG data is valid. + +[call [cmd ::png::imageInfo] [arg file]] + +Returns a dictionary with keys [const width], [const height], + +[const depth], [const color], [const compression], [const filter], and +[const interlace]. The values are the associated properties of the PNG +image in [arg file]. + +Throws an error if file is not a PNG image, or if the checksum of the +header is invalid. For information on interpreting the values for the +returned properties see + +[uri http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html]. + +[call [cmd ::png::getTimestamp] [arg file]] + +Returns the epoch time if a timestamp chunk is found in the PNG image +contained in the [arg file], otherwise returns the empty string. Does +not attempt to verify the checksum of the timestamp chunk. + +Throws an error if the [arg file] is not a valid PNG image. + +[call [cmd ::png::setTimestamp] [arg file] [arg time]] + +Writes a new timestamp to the [arg file], either replacing the old +timestamp, or adding one just before the data chunks if there was no +previous timestamp. [arg time] is the new time in the gmt epoch +format. + +Throws an error if [arg file] is not a valid PNG image. + +[call [cmd ::png::getComments] [arg file]] + +Currently supports only uncompressed comments. Does not attempt to +verify the checksums of the comment chunks. Returns a list where each +element is a comment. Each comment is itself a list. The list for a +plain text comment consists of 2 elements: the human readable keyword, +and the text data. A unicode (international) comment consists of 4 +elements: the human readable keyword, the language identifier, the +translated keyword, and the unicode text data. + +Throws an error if [arg file] is not a valid PNG image. + +[call [cmd ::png::removeComments] [arg file]] + +Removes all comments from the PNG image in [arg file]. Beware - This +uses memory equal to the file size minus comments, to hold the +intermediate result. + +Throws an error if [arg file] is not a valid PNG image. + +[call [cmd ::png::addComment] [arg file] [arg keyword] [arg text]] + +Adds a plain [arg text] comment to the PNG image in [arg file], just +before the first data chunk. Will throw an error if no data chunk is +found. [arg keyword] has to be less than 80 characters long to conform +to the PNG specification. + +[call [cmd ::png::addComment] [arg file] [arg keyword] [arg lang] [arg keyword2] [arg text]] + +Adds a unicode (international) comment to the PNG image in [arg file], +just before the first data chunk. Will throw an error if no data chunk +is found. [arg keyword] has to be less than 80 characters long to +conform to the PNG specification. [arg keyword2] is the translated +[arg keyword], in the language specified by the language identifier +[arg lang]. + +[call [cmd ::png::image] [arg file]] + +Given a PNG file returns the image in the list of scanlines format used by Tk_GetColor. + +[call [cmd ::png::write] [arg file] [arg data]] + +Takes a list of scanlines in the Tk_GetColor format and writes the represented image +to [arg file]. + +[list_end] + +[vset CATEGORY png] +[include ../doctools2base/include/feedback.inc] +[manpage_end] diff --git a/tcllib/modules/png/png.pcx b/tcllib/modules/png/png.pcx new file mode 100644 index 0000000..bbafe83 --- /dev/null +++ b/tcllib/modules/png/png.pcx @@ -0,0 +1,61 @@ +# -*- tcl -*- png.pcx +# Syntax of the commands provided by package png. +# +# For use by TclDevKit's static syntax checker (v4.1+). +# See http://www.activestate.com/solutions/tcl/ +# See http://aspn.activestate.com/ASPN/docs/Tcl_Dev_Kit/4.0/Checker.html#pcx_api +# for the specification of the format of the code in this file. +# + +package require pcx +pcx::register png +pcx::tcldep 0.1.2 needs tcl 8.2 + +namespace eval ::png {} + +#pcx::message FOO {... text ...} type +#pcx::scan <VERSION> <NAME> <RULE> + +pcx::check 0.1.2 std ::png::addComment \ + {checkSimpleArgs 3 5 { + checkFileName + checkWord + checkWord + {checkSimpleArgs 2 2 { + checkWord + checkWord + }} + }} +pcx::check 0.1.2 std ::png::getComments \ + {checkSimpleArgs 1 1 { + checkFileName + }} +pcx::check 0.1.2 std ::png::getTimestamp \ + {checkSimpleArgs 1 1 { + checkFileName + }} +pcx::check 0.1.2 std ::png::imageInfo \ + {checkSimpleArgs 1 1 { + checkFileName + }} +pcx::check 0.1.2 std ::png::isPNG \ + {checkSimpleArgs 1 1 { + checkFileName + }} +pcx::check 0.1.2 std ::png::removeComments \ + {checkSimpleArgs 1 1 { + checkFileName + }} +pcx::check 0.1.2 std ::png::setTimestamp \ + {checkSimpleArgs 2 2 { + checkFileName + checkWholeNum + }} +pcx::check 0.1.2 std ::png::validate \ + {checkSimpleArgs 1 1 { + checkFileName + }} + +# Initialization via pcx::init. +# Use a ::png::init procedure for non-standard initialization. +pcx::complete diff --git a/tcllib/modules/png/png.tcl b/tcllib/modules/png/png.tcl new file mode 100644 index 0000000..b3d6ac1 --- /dev/null +++ b/tcllib/modules/png/png.tcl @@ -0,0 +1,289 @@ +# png.tcl -- +# +# Querying and modifying PNG image files. +# +# Copyright (c) 2004-2012 Aaron Faupell <afaupell@users.sourceforge.net> +# +# See the file "license.terms" for information on usage and redistribution +# of this file, and for a DISCLAIMER OF ALL WARRANTIES. +# +# RCS: @(#) $Id: png.tcl,v 1.11 2012/07/09 16:35:04 afaupell Exp $ + +package provide png 0.2 + +namespace eval ::png {} + +proc ::png::_openPNG {file {mode r}} { + set fh [open $file $mode] + fconfigure $fh -encoding binary -translation binary -eofchar {} + if {[read $fh 8] != "\x89PNG\r\n\x1a\n"} { close $fh; return -code error "not a png file" } + return $fh +} + +proc ::png::_chunks {fh} { + set out [list] + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + lappend out [list $type [tell $fh] $len] + seek $fh [expr {$len + 4}] current + } + return $out +} + +proc ::png::isPNG {file} { + if {[catch {_openPNG $file} fh]} { return 0 } + close $fh + return 1 +} + +proc ::png::validate {file} { + package require crc32 + if {[catch {_openPNG $file} fh]} { return SIG } + set num 0 + set idat 0 + set last {} + + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + if {$len < 0} { close $fh; return BADLEN } + set r [read $fh $len] + binary scan [read $fh 4] I crc + if {$crc < 0} {set crc [format %u [expr {$crc & 0xffffffff}]]} + if {[eof $fh]} { close $fh; return EOF } + if {($num == 0) && ($type != "IHDR")} { close $fh; return NOHDR } + if {$type == "IDAT"} { set idat 1 } + if {[::crc::crc32 $type$r] != $crc} { close $fh; return CKSUM } + set last $type + incr num + } + close $fh + if {!$idat} { return NODATA } + if {$last != "IEND"} { return NOEND } + return OK +} + +proc ::png::imageInfo {file} { + set fh [_openPNG $file] + binary scan [read $fh 8] Ia4 len type + set r [read $fh $len] + if {![eof $fh] && $type == "IHDR"} { + binary scan $r IIccccc width height depth color compression filter interlace + binary scan [read $fh 4] I check + if {$check < 0} {set check [format %u [expr {$check & 0xffffffff}]]} + if {![catch {package present crc32}] && [::crc::crc32 IHDR$r] != $check} { + return -code error "header checksum failed" + } + close $fh + return [list width $width height $height depth $depth color $color \ + compression $compression filter $filter interlace $interlace] + } + close $fh + return +} + +proc ::png::getTimestamp {file} { + set fh [_openPNG $file] + + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + if {$type == "tIME"} { + set r [read $fh [expr {$len + 4}]] + binary scan $r Sccccc year month day hour minute second + close $fh + return [clock scan "$month/$day/$year $hour:$minute:$second" -gmt 1] + } + seek $fh [expr {$len + 4}] current + } + close $fh + return +} + +proc ::png::setTimestamp {file time} { + set fh [_openPNG $file r+] + + set time [eval binary format Sccccc [string map {" 0" " "} [clock format $time -format "%Y %m %d %H %M %S" -gmt 1]]] + if {![catch {package present crc32}]} { + append time [binary format I [::crc::crc32 tIME$time]] + } else { + append time [binary format I 0] + } + + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + if {[eof $fh]} { close $fh; return } + if {$type == "tIME"} { + seek $fh 0 current + puts -nonewline $fh $time + close $fh + return + } + if {$type == "IDAT" && ![info exists idat]} { set idat [expr {[tell $fh] - 8}] } + seek $fh [expr {$len + 4}] current + } + if {![info exists idat]} { close $fh; return -code error "no timestamp or data chunk found" } + seek $fh $idat start + set data [read $fh] + seek $fh $idat start + puts -nonewline $fh [binary format I 7]tIME$time$data + close $fh + return +} + +proc ::png::getComments {file} { + set fh [_openPNG $file] + set text {} + + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + set pos [tell $fh] + if {$type == "tEXt"} { + set r [read $fh $len] + lappend text [split $r \x00] + } elseif {$type == "iTXt"} { + set r [read $fh $len] + set keyword [lindex [split $r \x00] 0] + set r [string range $r [expr {[string length $keyword] + 1}] end] + binary scan $r cc comp method + if {$comp == 0} { + lappend text [linsert [split [string range $r 2 end] \x00] 0 $keyword] + } + } + seek $fh [expr {$pos + $len + 4}] start + } + close $fh + return $text +} + +proc ::png::removeComments {file} { + set fh [_openPNG $file r+] + set data "\x89PNG\r\n\x1a\n" + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + if {$type == "zTXt" || $type == "iTXt" || $type == "tEXt"} { + seek $fh [expr {$len + 4}] current + } else { + seek $fh -8 current + append data [read $fh [expr {$len + 12}]] + } + } + close $fh + set fh [open $file w] + fconfigure $fh -encoding binary -translation binary -eofchar {} + puts -nonewline $fh $data + close $fh +} + +proc ::png::addComment {file keyword arg1 args} { + if {[llength $args] > 0 && [llength $args] != 2} { close $fh; return -code error "wrong number of arguments" } + set fh [_openPNG $file r+] + + if {[llength $args] > 0} { + set comment "iTXt$keyword\x00\x00\x00$arg1\x00[encoding convertto utf-8 [lindex $args 0]]\x00[encoding convertto utf-8 [lindex $args 1]]" + } else { + set comment "tEXt$keyword\x00$arg1" + } + + if {![catch {package present crc32}]} { + append comment [binary format I [::crc::crc32 $comment]] + } else { + append comment [binary format I 0] + } + + while {[set r [read $fh 8]] != ""} { + binary scan $r Ia4 len type + if {$type == "IDAT"} { + seek $fh -8 current + set pos [tell $fh] + set data [read $fh] + seek $fh $pos start + set 1 [tell $fh] + puts -nonewline $fh $comment + set clen [binary format I [expr {[tell $fh] - $1 - 8}]] + seek $fh $pos start + puts -nonewline $fh $clen$comment$data + close $fh + return + } + seek $fh [expr {$len + 4}] current + } + close $fh + return -code error "no data chunk found" +} + +proc ::png::image {file} { + set fh [_openPNG $file] + set chunks [_chunks $fh] + set cdata {} + + set h [lsearch -exact -index 0 -inline $chunks IHDR] + seek $fh [lindex $h 1] start + binary scan [read $fh [lindex $h 2]] IIccccc width height depth color compression filter interlace + + if {$color != 2 || $compression != 0 || $depth != 8} { + return -code error "unsupported image format" + } + + foreach c [lsearch -exact -index 0 -all -inline $chunks IDAT] { + seek $fh [lindex $c 1] start + append cdata [read $fh [lindex $c 2]] + } + set data [zlib decompress $cdata] + + set len [string length $data] + set col 1 + set offset 1 + set row [list] + set out [list] + while {$offset < $len} { + binary scan $data @${offset}H2H2H2 r g b + lappend row "#$r$g$b" + incr offset 3 + if {$col == $width} { + set col 1 + incr offset + lappend out $row + set row [list] + continue + } + incr col + } + return $out +} + +proc ::png::write {file in} { + set blocksize 65524 + set chunks [list] + set data "" + lappend chunks [list IHDR [binary format IIccccc [llength [lindex $in 0]] [llength $in] 8 2 0 0 0]] + + foreach row $in { + append data \x00 + foreach pixel $row { + set pixel [string trimleft $pixel "#"] + append data [binary format H2H2H2 [string range $pixel 0 1] [string range $pixel 2 3] [string range $pixel 4 5]] + } + } + set cdata [zlib compress $data] + set offset 0 + while {$offset < ([string length $cdata] + $blocksize)} { + lappend chunks [list IDAT [string range $cdata $offset [expr {$offset+$blocksize-1}]]] + incr offset $blocksize + } + #lappend chunks [list tIME [eval binary format Sccccc [clock format [clock seconds] -format "%Y %m %d %H %M %S"]]] + lappend chunks [list IEND ""] + _write $file $chunks +} + +proc ::png::_write {file chunks} { + package require crc32 + set fh [open $file w+] + fconfigure $fh -encoding binary -translation binary + puts -nonewline $fh "\x89PNG\r\n\x1a\n" + foreach chunk $chunks { + puts -nonewline $fh [binary format Ia4 [string length [lindex $chunk 1]] [lindex $chunk 0]] + puts -nonewline $fh [lindex $chunk 1] + puts -nonewline $fh [binary format I [::crc::crc32 [join $chunk ""]]] + } + close $fh + return $file +} diff --git a/tcllib/modules/png/png.test b/tcllib/modules/png/png.test new file mode 100644 index 0000000..c805d4d --- /dev/null +++ b/tcllib/modules/png/png.test @@ -0,0 +1,306 @@ +# -*- tcl -*- +# png.test: tests for png decoding and manipulation. +# +# Copyright (c) 2004 by Andreas Kupries <andreas_kupries@users.sourceforge.net> +# +# RCS: @(#) $Id: png.test,v 1.10 2007/04/30 22:47:14 andreas_kupries Exp $ + +# ------------------------------------------------------------------------- + +source [file join \ + [file dirname [file dirname [file join [pwd] [info script]]]] \ + devtools testutilities.tcl] + +testsNeedTcl 8.2 +testsNeedTcltest 1.0 + +# Trf / tcllibc +support { + use crc/crc32.tcl crc32 ::crc +} +testing { + useLocal png.tcl png +} + +# ------------------------------------------------------------------------- +# Validation + +foreach f [TestFilesGlob testimages/*.png] { + set root [file rootname [file tail $f]] + + # All files have a valid signature, except for two. + + test png-ispng-$root {is png} { + ::png::isPNG $f + } [expr { + ![string equal $root xcrn0g04] && + ![string equal $root xlfn0g04] + }] ; # {} + + # All files are fully valid, except for all beginning with an 'x'. + + if {[string match x* $root]} continue + + test png-validate-$root {full validation} { + ::png::validate $f + } OK ;# {} +} + +# Validation II, the bad files ... + +foreach f [TestFilesGlob testimages/x*.png] { + set root [file rootname [file tail $f]] + + test png-validate-$root {full validation} { + ::png::validate $f + } [expr {[string match x00n0g01 $root] ? "NODATA" : "SIG"}] ;# {} +} + + +# ------------------------------------------------------------------------- +# imageInfo ... + +array set expected { + basi0g01 {color 0 compression 0 depth 1 filter 0 height 32 interlace 1 width 32} + basi0g02 {color 0 compression 0 depth 2 filter 0 height 32 interlace 1 width 32} + basi0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 1 width 32} + basi0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 1 width 32} + basi0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 1 width 32} + basi2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 1 width 32} + basi2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 1 width 32} + basi3p01 {color 3 compression 0 depth 1 filter 0 height 32 interlace 1 width 32} + basi3p02 {color 3 compression 0 depth 2 filter 0 height 32 interlace 1 width 32} + basi3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 1 width 32} + basi3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 1 width 32} + basi4a08 {color 4 compression 0 depth 8 filter 0 height 32 interlace 1 width 32} + basi4a16 {color 4 compression 0 depth 16 filter 0 height 32 interlace 1 width 32} + basi6a08 {color 6 compression 0 depth 8 filter 0 height 32 interlace 1 width 32} + basi6a16 {color 6 compression 0 depth 16 filter 0 height 32 interlace 1 width 32} + basn0g01 {color 0 compression 0 depth 1 filter 0 height 32 interlace 0 width 32} + basn0g02 {color 0 compression 0 depth 2 filter 0 height 32 interlace 0 width 32} + basn0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + basn0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + basn0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + basn2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + basn2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + basn3p01 {color 3 compression 0 depth 1 filter 0 height 32 interlace 0 width 32} + basn3p02 {color 3 compression 0 depth 2 filter 0 height 32 interlace 0 width 32} + basn3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + basn3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + basn4a08 {color 4 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + basn4a16 {color 4 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + basn6a08 {color 6 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + basn6a16 {color 6 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + bgai4a08 {color 4 compression 0 depth 8 filter 0 height 32 interlace 1 width 32} + bgai4a16 {color 4 compression 0 depth 16 filter 0 height 32 interlace 1 width 32} + bgan6a08 {color 6 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + bgan6a16 {color 6 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + bgbn4a08 {color 4 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + bggn4a16 {color 4 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + bgwn6a08 {color 6 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + bgyn6a16 {color 6 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + ccwn2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + ccwn3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + cdfn2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 8} + cdhn2c08 {color 2 compression 0 depth 8 filter 0 height 8 interlace 0 width 32} + cdsn2c08 {color 2 compression 0 depth 8 filter 0 height 8 interlace 0 width 8} + cdun2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + ch1n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + ch2n3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + cm0n0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + cm7n0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + cm9n0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + cs3n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + cs3n3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + cs5n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + cs5n3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + cs8n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + cs8n3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + ct0n0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + ct1n0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + ctzn0g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + f00n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f00n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f01n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f01n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f02n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f02n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f03n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f03n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f04n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + f04n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g03n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + g03n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g03n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + g04n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + g04n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g04n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + g05n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + g05n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g05n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + g07n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + g07n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g07n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + g10n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + g10n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g10n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + g25n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + g25n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + g25n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + oi1n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi1n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi2n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi2n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi4n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi4n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi9n0g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + oi9n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + pngsuite_logo {color 2 compression 0 depth 8 filter 0 height 256 interlace 0 width 256} + pp0n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + pp0n6a08 {color 6 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + ps1n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + ps1n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + ps2n0g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + ps2n2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + s01i3p01 {color 3 compression 0 depth 1 filter 0 height 1 interlace 1 width 1} + s01n3p01 {color 3 compression 0 depth 1 filter 0 height 1 interlace 0 width 1} + s02i3p01 {color 3 compression 0 depth 1 filter 0 height 2 interlace 1 width 2} + s02n3p01 {color 3 compression 0 depth 1 filter 0 height 2 interlace 0 width 2} + s03i3p01 {color 3 compression 0 depth 1 filter 0 height 3 interlace 1 width 3} + s03n3p01 {color 3 compression 0 depth 1 filter 0 height 3 interlace 0 width 3} + s04i3p01 {color 3 compression 0 depth 1 filter 0 height 4 interlace 1 width 4} + s04n3p01 {color 3 compression 0 depth 1 filter 0 height 4 interlace 0 width 4} + s05i3p02 {color 3 compression 0 depth 2 filter 0 height 5 interlace 1 width 5} + s05n3p02 {color 3 compression 0 depth 2 filter 0 height 5 interlace 0 width 5} + s06i3p02 {color 3 compression 0 depth 2 filter 0 height 6 interlace 1 width 6} + s06n3p02 {color 3 compression 0 depth 2 filter 0 height 6 interlace 0 width 6} + s07i3p02 {color 3 compression 0 depth 2 filter 0 height 7 interlace 1 width 7} + s07n3p02 {color 3 compression 0 depth 2 filter 0 height 7 interlace 0 width 7} + s08i3p02 {color 3 compression 0 depth 2 filter 0 height 8 interlace 1 width 8} + s08n3p02 {color 3 compression 0 depth 2 filter 0 height 8 interlace 0 width 8} + s09i3p02 {color 3 compression 0 depth 2 filter 0 height 9 interlace 1 width 9} + s09n3p02 {color 3 compression 0 depth 2 filter 0 height 9 interlace 0 width 9} + s32i3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 1 width 32} + s32n3p04 {color 3 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + s33i3p04 {color 3 compression 0 depth 4 filter 0 height 33 interlace 1 width 33} + s33n3p04 {color 3 compression 0 depth 4 filter 0 height 33 interlace 0 width 33} + s34i3p04 {color 3 compression 0 depth 4 filter 0 height 34 interlace 1 width 34} + s34n3p04 {color 3 compression 0 depth 4 filter 0 height 34 interlace 0 width 34} + s35i3p04 {color 3 compression 0 depth 4 filter 0 height 35 interlace 1 width 35} + s35n3p04 {color 3 compression 0 depth 4 filter 0 height 35 interlace 0 width 35} + s36i3p04 {color 3 compression 0 depth 4 filter 0 height 36 interlace 1 width 36} + s36n3p04 {color 3 compression 0 depth 4 filter 0 height 36 interlace 0 width 36} + s37i3p04 {color 3 compression 0 depth 4 filter 0 height 37 interlace 1 width 37} + s37n3p04 {color 3 compression 0 depth 4 filter 0 height 37 interlace 0 width 37} + s38i3p04 {color 3 compression 0 depth 4 filter 0 height 38 interlace 1 width 38} + s38n3p04 {color 3 compression 0 depth 4 filter 0 height 38 interlace 0 width 38} + s39i3p04 {color 3 compression 0 depth 4 filter 0 height 39 interlace 1 width 39} + s39n3p04 {color 3 compression 0 depth 4 filter 0 height 39 interlace 0 width 39} + s40i3p04 {color 3 compression 0 depth 4 filter 0 height 40 interlace 1 width 40} + s40n3p04 {color 3 compression 0 depth 4 filter 0 height 40 interlace 0 width 40} + tbbn1g04 {color 0 compression 0 depth 4 filter 0 height 32 interlace 0 width 32} + tbbn2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + tbbn3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tbgn2c16 {color 2 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + tbgn3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tbrn2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tbwn1g16 {color 0 compression 0 depth 16 filter 0 height 32 interlace 0 width 32} + tbwn3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tbyn3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tp0n1g08 {color 0 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tp0n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tp0n3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + tp1n3p08 {color 3 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + z00n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + z03n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + z06n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} + z09n2c08 {color 2 compression 0 depth 8 filter 0 height 32 interlace 0 width 32} +} + +foreach f [TestFilesGlob testimages/*.png] { + set root [file rootname [file tail $f]] + + # Files beginning with x are invalid, and thus not usable in these + # tests. + + if {[string match x* $root]} continue + + test png-imageinfo-$root {retrieve image information} { + dictsort [::png::imageInfo $f] + } $expected($root) ; # {} +} + +# ------------------------------------------------------------------------- +# Timestamps + +array set exptime { + cm0n0g04 946730096 + cm7n0g04 0 + cm9n0g04 946684799 +} + +foreach f [TestFilesGlob testimages/cm*.png] { + set root [file rootname [file tail $f]] + + #puts [clock format $exptime($root) -gmt 1] + + test png-gettimestamp-$root {retrieve timestamp} { + ::png::getTimestamp $f + } $exptime($root) ; # {} +} + +# ------------------------------------------------------------------------- +# Comments + +array set comex { + ct1n0g04 {{Title PngSuite} {Author {Willem A.J. van Schaik +(willem@schaik.com)}} {Copyright {Copyright Willem van Schaik, Singapore 1995-96}} {Description {A compilation of a set of images created to test the +various color-types of the PNG format. Included are +black&white, color, paletted, with alpha channel, with +transparency formats. All bit-depths allowed according +to the spec are present.}} {Software {Created on a NeXTstation color using "pnmtopng".}} {Disclaimer Freeware.}} + ctzn0g04 {{Title PngSuite} {Author {Willem A.J. van Schaik +(willem@schaik.com)}}} +} + +# - Retrieval + +foreach f [TestFilesGlob testimages/*.png] { + set root [file rootname [file tail $f]] + + # All files have a valid signature, except for two. These we ignore. + if {[string equal $root xcrn0g04]} continue + if {[string equal $root xlfn0g04]} continue + # All files are fully valid, except for all beginning with an + # 'x'. We ignore them as well. + if {[string match x* $root]} continue + + test png-getcomment-$root {get comments} { + ::png::getComments $f + } [expr { + ![info exists comex($root)] ? "" : $comex($root) + }] ; # {} +} + +# - Removal + +# Note: For a bad removeComments tests fail only on platforms where +# the system encoding is not ASCII like, or the EOL is not a plain +# LF. Windows for example, or asian systems. + +foreach root [array names comex] { + set f [localPath testimages/${root}.png] + + test png-removecomment-$root {remove comments} { + set copy [makeFile {} pngrc.$root] + file copy -force $f $copy + + ::png::removeComments $copy + set res [list [::png::validate $copy] [::png::getComments $copy]] + removeFile pngrc.$root + set res + } {OK {}} +} + +# ------------------------------------------------------------------------- +testsuiteCleanup diff --git a/tcllib/modules/png/testimages/basi0g01.png b/tcllib/modules/png/testimages/basi0g01.png Binary files differnew file mode 100644 index 0000000..556fa72 --- /dev/null +++ b/tcllib/modules/png/testimages/basi0g01.png diff --git a/tcllib/modules/png/testimages/basi0g02.png b/tcllib/modules/png/testimages/basi0g02.png Binary files differnew file mode 100644 index 0000000..ce09821 --- /dev/null +++ b/tcllib/modules/png/testimages/basi0g02.png diff --git a/tcllib/modules/png/testimages/basi0g04.png 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All (as far as that is possible) +formats supported by the PNG standard are represented. + + +1. INTRODUCTION +-------------------- + +1.1 PNG capabilities +------------------------ + +Supported color-types are: + + - grayscale + - grayscale + alpha-channel + - color palettes + - rgb + - rgb + alpha-channel + +Allowed bitdepths are depending on the color-type, but are in the range +of 1-bit (grayscale, which is b&w) upto 16-bits. + +Special features are: + + - interlacing (Adam-7) + - gamma-support + - transparency (a poor-man's alpha solution) + + +1.2 File naming +------------------- + +Where possible, the testfiles are 32x32 bits icons. This results in a still +reasonable size of the suite even with a large number of tests. The name +of each test-file reflects thetype in the following way: + + g04i2c08.png + || |||+---- bit-depth + || ||+----- color-type (descriptive) + || |+------ color-type (numerical) + || +------- interlaced or non-interlaced + |+--------- parameter of test (in this case gamma-value) + +---------- test feature (in this case gamma) + + +1.3 PNG formats +------------------- + +color-type: + 0g - grayscale + 2c - rgb color + 3p - paletted + 4a - grayscale + alpha channel + 6a - rgb color + alpha channel + +bit-depth: + 01 - with color-type 0, 3 + 02 - with color-type 0, 3 + 04 - with color-type 0, 3 + 08 - with color-type 0, 2, 3, 4, 6 + 16 - with color-type 0, 2, 4, 6 + +interlacing: + n - non-interlaced + i - interlaced + + +2. THE TESTS +----------------- + +2.1 Sizes +------------- + +These tests are there to check if your software handles pictures well, with +picture sizes that are not a multiple of 8. This is particularly important +with Adam-7 type interlacing. In the same way these tests check if pictures +size 1x1 and similar are ok. + + s01 - 1x1 pixel picture + s02 - 2x2 pixel picture + s03 - 3x3 pixel picture + s04 - 4x4 pixel picture + s05 - 5x5 pixel picture + s06 - 6x6 pixel picture + s07 - 7x7 pixel picture + s08 - 8x8 pixel picture + s09 - 9x9 pixel picture + s32 - 32x32 pixel picture + s33 - 33x33 pixel picture + s34 - 34x34 pixel picture + s35 - 35x35 pixel picture + s36 - 36x36 pixel picture + s37 - 37x37 pixel picture + s38 - 38x38 pixel picture + s39 - 39x39 pixel picture + s40 - 40x40 pixel picture + + +2.2 Background +------------------ + +When the PNG file contains a background chunck, this should be used for +pictures with alpha-channel or pictures with a transparency chunck. For +pictures without this background-chunk, but with alpha, this testset +assumes a black background. + +For the images in this test, the left-side should be 100% the background +color, where moving to the right the color should gradually become the +image pattern. + + bga - alpha + no background + bgw - alpha + white background + bgg - alpha + gray background + bgb - alpha + black background + bgy - alpha + yellow background + + +2.3 Transparency +-------------------- + +Transparency should be used together with a background chunk. To test the +combination of the two the latter 4 tests are there. How to handle pictures +with transparancy, but without a background, opinions can differ. Here we +use black, but especially in the case of paletted images, the normal color +would maybe even be better. + + tp0 - not transparent for reference + tp1 - transparent, but no background chunk + tbw - transparent + white background + tbg - transparent + gray background + tbb - transparent + black background + tby - transparent + yellow background + + +2.4 Gamma +------------- + +To test if your viewer handles gamma-correction, 6 testfiles are available. +They contain corrected color-ramps and a corresponding gamma-chunk with the +file-gamma value. These are created in such a way that when the viewer does +the gamma correction right, all 6 should be displayed identical. + +If they are different, probably the gamma correction is omitted. In that +case, have a look at the two right coloumns in the 6 pictures. The image +where those two look the same (when looked from far) reflects the gamma of +your system. However, because of the limited size of the image, you should +do more elaborate tests to determine your display gamma. + + g03 - file-gamma = 0.35, for display with gamma = 2.8 + g04 - file-gamma = 0.45, for display with gamma = 2.2 (PC) + g05 - file-gamma = 0.55, for display with gamma = 1.8 (Mac) + g07 - file-gamma = 0.70, for display with gamma = 1.4 + g10 - file-gamma = 1.00, for display with gamma = 1.0 (NeXT) + g25 - file-gamma = 2.50, for display with gamma = 0.4 + + +2.5 Filtering +----------------- + +PNG uses file-filtering, for optimal compression. Normally the type is of +filtering is adjusted to the contents of the picture, but here each file +has the same picture, with a different filtering. + + f0 - no filtering + f1 - sub filtering + f2 - up filtering + f3 - average filtering + f4 - paeth filtering + + +2.6 Additional palettes +--------------------------- + +Besides the normal use of paletted images, palette chunks can in combination +with true-color (and other) images also be used to select color lookup-tables +when the video system is of limited capabilities. The suggested palette chunk +is specially created for this purpose. + + pp - normal palette chunk + ps - suggested palette chunk + + +2.7 Ancillary chunks (under construction) +------------------------ + +To test the correct decoding of ancillary chunks, these test-files contain +one or more examples of these chunkcs. Depending on the type of chunk, a +number of typical values are selected to test. Unluckily, the testset can +not contain all combinations, because that would be an endless set. + +The significant bits are used in files with the next higher bit-depth. They +indicate howmany bits are valid. + + cs3 - 3 significant bits + cs5 - 5 significant bits + cs8 - 8 significant bits (reference) + cs3 - 13 significant bits + +For the physical pixel dimensions, the result of each decoding should be +a sqare picture. The first (cdf) image is an example of flat (horizontal) +pixels, where the pHYS chunk (x is 1 per unit, y = 4 per unit) must take +care of the correction. The second is just the other way round. The last +example uses the unit specifier, for 1000 pixels per meter. This should +result in a picture of 3.2 cm square. + + cdf - physical pixel dimensions, 8x32 flat pixels + cdh - physical pixel dimensions, 32x8 high pixels + cds - physical pixel dimensions, 8x8 square pixels + cdu - physical pixel dimensions, with unit-specifier + + ccw - primary chromaticities and white point + + ch1 - histogram 15 colors + ch2 - histogram 256 colors + + cm7 - modification time, 01-jan-1970 + cm9 - modification time, 31-dec-1999 + cm0 - modification time, 01-jan-2000 + +In the textual chunk, a number of the standard, and some non-standard +text items are included. + + ct0 - no textual data + ct1 - with textual data + ctz - with compressed textual data + + +2.8 Chunk ordering (still under construction) +---------------------- + +These testfiles will test the obligatory ordering relations between various +chunk types (not yet) as well as the number of data chunks used for the image. + + oi1 - mother image with 1 idat-chunk + oi2 - image with 2 idat-chunks + oi4 - image with 4 unequal sized idat-chunks + oi9 - all idat-chunks of length one + + +2.9 Compression level +------------------------- + +Here you will find a set of images compressed by zlib, ranging from level 0 +for no compression at maximum speed upto level 9 for maximum compression. + + z00 - zlib compression level 0 - none + z03 - zlib compression level 3 + z06 - zlib compression level 6 - default + z09 - zlib compression level 9 - maximum + + +2.10 Corrupted files (under construction) +----------------------- + +All these files are illegal. When decoding they should generate appropriate +error-messages. + + x00 - empty IDAT chunk + xcr - added cr bytes + xlf - added lf bytes + xc0 - color type 0 + xc9 - color type 9 + xd0 - bit-depth 0 + xd3 - bit-depth 3 + xd9 - bit-depth 99 + xcs - incorrect IDAT checksum + + +3. TEST FILES +------------------ + +For each of the tests listed above, one or more test-files are created. A +selection is made (for each test) for the color-type and bitdepth to be used +for the tests. Further for a number of tests, both a non-interlaced as well +as an interlaced version is available. + + +3.1 Basic format test files (non-interlaced) +------------------------------------------------ + + basn0g01 - black & white + basn0g02 - 2 bit (4 level) grayscale + basn0g04 - 4 bit (16 level) grayscale + basn0g08 - 8 bit (256 level) grayscale + basn0g16 - 16 bit (64k level) grayscale + basn2c08 - 3x8 bits rgb color + basn2c16 - 3x16 bits rgb color + basn3p01 - 1 bit (2 color) paletted + basn3p02 - 2 bit (4 color) paletted + basn3p04 - 4 bit (16 color) paletted + basn3p08 - 8 bit (256 color) paletted + basn4a08 - 8 bit grayscale + 8 bit alpha-channel + basn4a16 - 16 bit grayscale + 16 bit alpha-channel + basn6a08 - 3x8 bits rgb color + 8 bit alpha-channel + basn6a16 - 3x16 bits rgb color + 16 bit alpha-channel + + +3.2 Basic format test files (Adam-7 interlaced) +--------------------------------------------------- + + basi0g01 - black & white + basi0g02 - 2 bit (4 level) grayscale + basi0g04 - 4 bit (16 level) grayscale + basi0g08 - 8 bit (256 level) grayscale + basi0g16 - 16 bit (64k level) grayscale + basi2c08 - 3x8 bits rgb color + basi2c16 - 3x16 bits rgb color + basi3p01 - 1 bit (2 color) paletted + basi3p02 - 2 bit (4 color) paletted + basi3p04 - 4 bit (16 color) paletted + basi3p08 - 8 bit (256 color) paletted + basi4a08 - 8 bit grayscale + 8 bit alpha-channel + basi4a16 - 16 bit grayscale + 16 bit alpha-channel + basi6a08 - 3x8 bits rgb color + 8 bit alpha-channel + basi6a16 - 3x16 bits rgb color + 16 bit alpha-channel + + +3.3 Sizes test files +----------------------- + + s01n3p01 - 1x1 paletted file, no interlacing + s02n3p01 - 2x2 paletted file, no interlacing + s03n3p01 - 3x3 paletted file, no interlacing + s04n3p01 - 4x4 paletted file, no interlacing + s05n3p02 - 5x5 paletted file, no interlacing + s06n3p02 - 6x6 paletted file, no interlacing + s07n3p02 - 7x7 paletted file, no interlacing + s08n3p02 - 8x8 paletted file, no interlacing + s09n3p02 - 9x9 paletted file, no interlacing + s32n3p04 - 32x32 paletted file, no interlacing + s33n3p04 - 33x33 paletted file, no interlacing + s34n3p04 - 34x34 paletted file, no interlacing + s35n3p04 - 35x35 paletted file, no interlacing + s36n3p04 - 36x36 paletted file, no interlacing + s37n3p04 - 37x37 paletted file, no interlacing + s38n3p04 - 38x38 paletted file, no interlacing + s39n3p04 - 39x39 paletted file, no interlacing + s40n3p04 - 40x40 paletted file, no interlacing + + s01i3p01 - 1x1 paletted file, interlaced + s02i3p01 - 2x2 paletted file, interlaced + s03i3p01 - 3x3 paletted file, interlaced + s04i3p01 - 4x4 paletted file, interlaced + s05i3p02 - 5x5 paletted file, interlaced + s06i3p02 - 6x6 paletted file, interlaced + s07i3p02 - 7x7 paletted file, interlaced + s08i3p02 - 8x8 paletted file, interlaced + s09i3p02 - 9x9 paletted file, interlaced + s32i3p04 - 32x32 paletted file, interlaced + s33i3p04 - 33x33 paletted file, interlaced + s34i3p04 - 34x34 paletted file, interlaced + s35i3p04 - 35x35 paletted file, interlaced + s36i3p04 - 36x36 paletted file, interlaced + s37i3p04 - 37x37 paletted file, interlaced + s38i3p04 - 38x38 paletted file, interlaced + s39i3p04 - 39x39 paletted file, interlaced + s40i3p04 - 40x40 paletted file, interlaced + + +3.4 Background test files (with alpha) +------------------------------------------ + + bgai4a08 - 8 bit grayscale, alpha, no background chunk, interlaced + bgai4a16 - 16 bit grayscale, alpha, no background chunk, interlaced + bgan6a08 - 3x8 bits rgb color, alpha, no background chunk + bgan6a16 - 3x16 bits rgb color, alpha, no background chunk + + bgbn4a08 - 8 bit grayscale, alpha, black background chunk + bggn4a16 - 16 bit grayscale, alpha, gray background chunk + bgwn6a08 - 3x8 bits rgb color, alpha, white background chunk + bgyn6a16 - 3x16 bits rgb color, alpha, yellow background chunk + + +3.5 Transparency (and background) test files +------------------------------------------------ + + tp0n1g08 - not transparent for reference (logo on gray) + tbbn1g04 - transparent, black background chunk + tbwn1g16 - transparent, white background chunk + tp0n2c08 - not transparent for reference (logo on gray) + tbrn2c08 - transparent, red background chunk + tbgn2c16 - transparent, green background chunk + tbbn2c16 - transparent, blue background chunk + tp0n3p08 - not transparent for reference (logo on gray) + tp1n3p08 - transparent, but no background chunk + tbbn3p08 - transparent, black background chunk + tbgn3p08 - transparent, light-gray background chunk + tbwn3p08 - transparent, white background chunk + tbyn3p08 - transparent, yellow background chunk + + +3.6 Gamma test files +------------------------ + + g03n0g16 - grayscale, file-gamma = 0.35 + g04n0g16 - grayscale, file-gamma = 0.45 + g05n0g16 - grayscale, file-gamma = 0.55 + g07n0g16 - grayscale, file-gamma = 0.70 + g10n0g16 - grayscale, file-gamma = 1.00 + g25n0g16 - grayscale, file-gamma = 2.50 + g03n2c08 - color, file-gamma = 0.35 + g04n2c08 - color, file-gamma = 0.45 + g05n2c08 - color, file-gamma = 0.55 + g07n2c08 - color, file-gamma = 0.70 + g10n2c08 - color, file-gamma = 1.00 + g25n2c08 - color, file-gamma = 2.50 + g03n3p04 - paletted, file-gamma = 0.35 + g04n3p04 - paletted, file-gamma = 0.45 + g05n3p04 - paletted, file-gamma = 0.55 + g07n3p04 - paletted, file-gamma = 0.70 + g10n3p04 - paletted, file-gamma = 1.00 + g25n3p04 - paletted, file-gamma = 2.50 + + +3.7 Filtering test files +---------------------------- + + f00n0g08 - grayscale, no interlacing, filter-type 0 + f01n0g08 - grayscale, no interlacing, filter-type 1 + f02n0g08 - grayscale, no interlacing, filter-type 2 + f03n0g08 - grayscale, no interlacing, filter-type 3 + f04n0g08 - grayscale, no interlacing, filter-type 4 + f00n2c08 - color, no interlacing, filter-type 0 + f01n2c08 - color, no interlacing, filter-type 1 + f02n2c08 - color, no interlacing, filter-type 2 + f03n2c08 - color, no interlacing, filter-type 3 + f04n2c08 - color, no interlacing, filter-type 4 + + +3.8 Additional palette chunk test files +------------------------------------------- + + pp0n2c16 - six-cube palette-chunk in true-color image + pp0n6a08 - six-cube palette-chunk in true-color+alpha image + ps1n0g08 - six-cube suggested palette (1 byte) in grayscale image + ps1n2c16 - six-cube suggested palette (1 byte) in true-color image + ps2n0g08 - six-cube suggested palette (2 bytes) in grayscale image + ps2n2c16 - six-cube suggested palette (2 bytes) in true-color image + + +3.9 Ancillary chunks test files +----------------------------------- + + cs5n2c08 - color, 5 significant bits + cs8n2c08 - color, 8 significant bits (reference) + cs3n2c16 - color, 13 significant bits + cs3n3p08 - paletted, 3 significant bits + cs5n3p08 - paletted, 5 significant bits + cs8n3p08 - paletted, 8 significant bits (reference) + + cdfn2c08 - physical pixel dimensions, 8x32 flat pixels + cdhn2c08 - physical pixel dimensions, 32x8 high pixels + cdsn2c08 - physical pixel dimensions, 8x8 square pixels + cdun2c08 - physical pixel dimensions, 1000 pixels per 1 meter + + ccwn2c08 - chroma chunk w:0.3127,0.3290 r:0.64,0.33 g:0.30,0.60 b:0.15,0.06 + ccwn3p08 - chroma chunk w:0.3127,0.3290 r:0.64,0.33 g:0.30,0.60 b:0.15,0.06 + + ch1n3p04 - histogram 15 colors + ch2n3p08 - histogram 256 colors + + cm7n0g04 - modification time, 01-jan-1970 00:00:00 + cm9n0g04 - modification time, 31-dec-1999 23:59:59 + cm0n0g04 - modification time, 01-jan-2000 12:34:56 + + ct0n0g04 - no textual data + ct1n0g04 - with textual data + ctzn0g04 - with compressed textual data + + + +3.10 Chunk ordering +---------------------- + + oi1n0g16 - grayscale mother image with 1 idat-chunk + oi2n0g16 - grayscale image with 2 idat-chunks + oi4n0g16 - grayscale image with 4 unequal sized idat-chunks + oi9n0g16 - grayscale image with all idat-chunks length one + oi1n2c16 - color mother image with 1 idat-chunk + oi2n2c16 - color image with 2 idat-chunks + oi4n2c16 - color image with 4 unequal sized idat-chunks + oi9n2c16 - color image with all idat-chunks length one + + + +3.11 Compression level +------------------------- + + z00n2c08 - color, no interlacing, compression level 0 (none) + z03n2c08 - color, no interlacing, compression level 3 + z06n2c08 - color, no interlacing, compression level 6 (default) + z09n2c08 - color, no interlacing, compression level 9 (maximum) + + + +3.12 Currupted files +----------------------- + + x00n0g01 - empty 0x0 grayscale file + xcrn0g04 - added cr bytes + xlfn0g04 - added lf bytes + xc0n0c08 - color type 0 + xc9n0c08 - color type 9 + xd0n2c00 - bit-depth 0 + xd3n2c03 - bit-depth 3 + xd9n2c99 - bit-depth 99 + xcsn2c08 - incorrect IDAT checksum + + +-------- + (c) Willem van Schaik + willem@schaik.com + Singapore, October 1996 diff --git a/tcllib/modules/png/testimages/pngsuite_logo.png b/tcllib/modules/png/testimages/pngsuite_logo.png Binary files differnew file mode 100644 index 0000000..205460d --- /dev/null +++ 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