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103 lines
2.2 KiB
103 lines
2.2 KiB
4 years ago
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#!/bin/sh
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#
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# Copyright (c) 2013 John Cunningham Bowler
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#
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# Last changed in libpng 1.6.0 [February 14, 2013]
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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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