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# Autoconf macros for dvipng.
# Copyright (C) 2002-2010 Jan-Åke Larsson <jan-ake.larsson@liu.se>
# Copyright (C) 2010-2013 Peter Breitenlohner <tex-live@tug.org>
#
# This file is free software; the copyright holders
# give unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
#
# Extracted from dvipng-1.12/aclocal.m4 and adapted for use in TeX Live.

# GS_CHECK_DEVICES
# ----------------
# Check GS (ghostscript) devices.
AC_DEFUN([GS_CHECK_DEVICES], [dnl
GS_WARN=
_GS_HAS_DEVICE([pngalpha],
               [GS_WARN="Your EPS inclusions will be cropped to the
        boundingbox, and rendered on an opaque background.
        Upgrade GhostScript to avoid this."
        _GS_HAS_DEVICE([png16m],
                       [GS_WARN="Your EPS inclusions may not work.
        Upgrade/install GhostScript to avoid this."])])
if test -n "$GS_WARN"; then
  AC_MSG_WARN([$GS_WARN])
fi
]) # GS_CHECK_DEVICES

# _GS_HAS_DEVICE(DEVICE, ACTION-IF-FAILED)
# ----------------------------------------
# Internal subroutine.  Check if GS has the device DEVICE and
# execute the shell code ACTION-IF-FAILED if not.
m4_define([_GS_HAS_DEVICE], [dnl
AC_MSG_CHECKING([whether $GS has the $1 device])
if $GS -h | grep $1 >/dev/null; then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
  $2
fi
])# _GS_HAS_DEVICE