#!/bin/sh

#

# Make a set of test PNG files, MAKEPNG is the name of the makepng executable

# built from contrib/libtests/makepng.c

# Copyright (c) 2015 John Cunningham Bowler

# Last changed in libpng 1.7.0 [(PENDING RELEASE)]

# This code is released under the libpng license.

# For conditions of distribution and use, see the disclaimer

# and license in png.h

# The arguments say whether to build all the files or whether just to build the

# ones that extend the code-coverage of libpng from the existing test files in

# contrib/pngsuite.

test -n "$MAKEPNG" || MAKEPNG=./makepng

opts=

mp(){

   ${MAKEPNG} $opts $1 "$3" "$4" "$3-$4$2.png"

}

mpg(){

   if test "$1" = "none"

   then

      mp "" "" "$2" "$3"

   else

      mp "--$1" "-$1" "$2" "$3"

   fi

}

mptrans(){

   if test "$1" = "none"

   then

      mp "--tRNS" "-tRNS" "$2" "$3"

   else

      mp "--tRNS --$1" "-$1-tRNS" "$2" "$3"

   fi

}

case "$1" in

   --small)

      opts="--small";;&

   --all|--small)

      for g in none sRGB linear 1.8

      do

         for c in gray palette

         do

            for b in 1 2 4

            do

               mpg "$g" "$c" "$b"

               mptrans "$g" "$c" "$b"

            done

         done

         mpg "$g" palette 8

         mptrans "$g" palette 8

         for b in 8 16

         do

            for c in gray gray-alpha rgb rgb-alpha

            do

               mpg "$g" "$c" "$b"

            done

            for c in gray rgb

            do

               mptrans "$g" "$c" "$b"

            done

         done

      done;;

   --coverage)

      # Comments below indicate cases known to be required and not duplicated

      # in other (required) cases; the aim is to get a minimal set that gives

      # the maxium code coverage.

      mpg none gray-alpha 8 # required: code coverage, sRGB opaque component

      mpg none palette 8 # required: basic palette read

      mpg 1.8 gray 2 # required: tests gamma threshold code

      mpg 1.8 palette 2 # required: code coverage

      mpg 1.8 palette 4 # required: code coverage

      mpg 1.8 palette 8 # error limits only

      mpg linear palette 8 # error limits only

      mpg linear rgb-alpha 16 # error limits only

      mpg sRGB palette 1 # required: code coverage

      mpg sRGB rgb-alpha 16 # required: code coverage: pngread.c:2422 untested

      :;;

   *)

      echo "$0 $1: unknown argument, usage:" >&2

      echo "  $0 [--all|--coverage|--small]" >&2

      exit 1

esac