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cb129a6234
generator. The generator generates images that test the full range of sample values, allow the error numbers in pngstest to be tuned and checked. makepng also allows generation of images with extra chunks, although this is still work-in-progress.
103 lines
2.2 KiB
Bash
103 lines
2.2 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 2012 John Cunningham Bowler
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#
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# Last changed in libpng 1.6.0 [(PENDING RELEASE)]
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#
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# This code is released under the libpng license.
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# For conditions of distribution and use, see the disclaimer
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# and license in png.h
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#
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# Generate a set of PNG test images. The images are generated in a
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# sub-directory called 'tests' by default, however a command line argument will
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# change that name. The generation requires a built version of makepng in the
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# current directory.
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#
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usage(){
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exec >&2
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echo "$0 [<directory>]"
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echo ' Generate a set of PNG test files in "directory" ("tests" by default)'
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exit 1
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}
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mp="$PWD/makepng"
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test -x "$mp" || {
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exec >&2
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echo "$0: the 'makepng' program must exist"
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echo " in the directory within which this program:"
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echo " $mp"
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echo " is executed"
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usage
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}
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# Just one argument: the directory
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testdir="tests"
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test $# -gt 1 && {
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testdir="$1"
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shift
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}
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test $# -eq 0 || usage
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# Take care not to clobber something
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if test -e "$testdir"
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then
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test -d "$testdir" || usage
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else
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# mkdir -p isn't portable, so do the following
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mkdir "$testdir" 2>/dev/null || mkdir -p "$testdir" || usage
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fi
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# This fails in a very satisfactory way if it's not accessible
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cd "$testdir"
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:>"test$$.png" || {
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exec >&2
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echo "$testdir: directory not writable"
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usage
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}
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rm "test$$.png" || {
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exec >&2
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echo "$testdir: you have create but not write privileges here."
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echo " This is unexpected. You have a spurion; "'"'"test$$.png"'"'"."
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echo " You need to remove this yourself. Try a different directory."
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exit 1
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}
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# Now call makepng ($mp) to create every file we can think of with a
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# reasonable name
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doit(){
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for gamma in "" --sRGB --linear --1.8
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do
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case "$gamma" in
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"")
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gname=;;
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--sRGB)
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gname="-srgb";;
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--linear)
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gname="-lin";;
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--1.8)
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gname="-18";;
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*)
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gname="-$gamma";;
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esac
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"$mp" $gamma "$1" "$2" "test-$1-$2$gname.png"
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done
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}
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#
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for ct in gray palette
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do
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for bd in 1 2 4 8
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do
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doit "$ct" "$bd"
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done
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done
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#
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doit "gray" "16"
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#
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for ct in gray-alpha rgb rgb-alpha
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do
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for bd in 8 16
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do
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doit "$ct" "$bd"
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done
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done
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