source/libs/libpng/libpng-src/contrib/libtests/gentests.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2013 John Cunningham Bowler
   4 #
   5 # Last changed in libpng 1.6.0 [February 14, 2013]
   6 #
   7 # This code is released under the libpng license.
   8 # For conditions of distribution and use, see the disclaimer
   9 # and license in png.h
  10 #
  11 # Generate a set of PNG test images.  The images are generated in a
  12 # sub-directory called 'tests' by default, however a command line argument will
  13 # change that name.  The generation requires a built version of makepng in the
  14 # current directory.
  15 #
  16 usage(){
  17    exec >&2
  18    echo "$0 [<directory>]"
  19    echo '  Generate a set of PNG test files in "directory" ("tests" by default)'
  20    exit 1
  21 }
  22
  23 mp="$PWD/makepng"
  24 test -x "$mp" || {
  25    exec >&2
  26    echo "$0: the 'makepng' program must exist"
  27    echo "  in the directory within which this program:"
  28    echo "    $mp"
  29    echo "  is executed"
  30    usage
  31 }
  32
  33 # Just one argument: the directory
  34 testdir="tests"
  35 test $# -gt 1 && {
  36    testdir="$1"
  37    shift
  38 }
  39 test $# -eq 0 || usage
  40
  41 # Take care not to clobber something
  42 if test -e "$testdir"
  43 then
  44    test -d "$testdir" || usage
  45 else
  46    # mkdir -p isn't portable, so do the following
  47    mkdir "$testdir" 2>/dev/null || mkdir -p "$testdir" || usage
  48 fi
  49
  50 # This fails in a very satisfactory way if it's not accessible
  51 cd "$testdir"
  52 :>"test$$.png" || {
  53    exec >&2
  54    echo "$testdir: directory not writable"
  55    usage
  56 }
  57 rm "test$$.png" || {
  58    exec >&2
  59    echo "$testdir: you have create but not write privileges here."
  60    echo "  This is unexpected.  You have a spurion; "'"'"test$$.png"'"'"."
  61    echo "  You need to remove this yourself.  Try a different directory."
  62    exit 1
  63 }
  64
  65 # Now call makepng ($mp) to create every file we can think of with a
  66 # reasonable name
  67 doit(){
  68    for gamma in "" --sRGB --linear --1.8
  69    do
  70       case "$gamma" in
  71          "")
  72             gname=;;
  73          --sRGB)
  74             gname="-srgb";;
  75          --linear)
  76             gname="-lin";;
  77          --1.8)
  78             gname="-18";;
  79          *)
  80             gname="-$gamma";;
  81       esac
  82       "$mp" $gamma "$1" "$2" "test-$1-$2$gname.png"
  83    done
  84 }
  85 #
  86 for ct in gray palette
  87 do
  88    for bd in 1 2 4 8
  89    do
  90       doit "$ct" "$bd"
  91    done
  92 done
  93 #
  94 doit "gray" "16"
  95 #
  96 for ct in gray-alpha rgb rgb-alpha
  97 do
  98    for bd in 8 16
  99    do
 100       doit "$ct" "$bd"
 101    done
 102 done