#!/bin/sh # # Copyright (c) 2013 John Cunningham Bowler # # Last changed in libpng 1.6.0 [February 14, 2013] # # This code is released under the libpng license. # For conditions of distribution and use, see the disclaimer # and license in png.h # # Generate a set of PNG test images. The images are generated in a # sub-directory called 'tests' by default, however a command line argument will # change that name. The generation requires a built version of makepng in the # current directory. # usage(){ exec >&2 echo "$0 []" echo ' Generate a set of PNG test files in "directory" ("tests" by default)' exit 1 } mp="$PWD/makepng" test -x "$mp" || { exec >&2 echo "$0: the 'makepng' program must exist" echo " in the directory within which this program:" echo " $mp" echo " is executed" usage } # Just one argument: the directory testdir="tests" test $# -gt 1 && { testdir="$1" shift } test $# -eq 0 || usage # Take care not to clobber something if test -e "$testdir" then test -d "$testdir" || usage else # mkdir -p isn't portable, so do the following mkdir "$testdir" 2>/dev/null || mkdir -p "$testdir" || usage fi # This fails in a very satisfactory way if it's not accessible cd "$testdir" :>"test$$.png" || { exec >&2 echo "$testdir: directory not writable" usage } rm "test$$.png" || { exec >&2 echo "$testdir: you have create but not write privileges here." echo " This is unexpected. You have a spurion; "'"'"test$$.png"'"'"." echo " You need to remove this yourself. Try a different directory." exit 1 } # Now call makepng ($mp) to create every file we can think of with a # reasonable name doit(){ for gamma in "" --sRGB --linear --1.8 do case "$gamma" in "") gname=;; --sRGB) gname="-srgb";; --linear) gname="-lin";; --1.8) gname="-18";; *) gname="-$gamma";; esac "$mp" $gamma "$1" "$2" "test-$1-$2$gname.png" done } # for ct in gray palette do for bd in 1 2 4 8 do doit "$ct" "$bd" done done # doit "gray" "16" # for ct in gray-alpha rgb rgb-alpha do for bd in 8 16 do doit "$ct" "$bd" done done