+# converts an image $2 (format $1) to $4 (format $3)
+from __future__ import print_function
+import os, re, sys
+
+# We may need some extra options only supported by recent convert versions
+re_version = re.compile(r'^Version:.*ImageMagick\s*(\d*)\.(\d*)\.(\d*).*$')
+# imagemagick 7
+command = 'magick'
+fout = os.popen('magick -version 2>&1')
+output = fout.readline()
+if fout.close() is not None:
+ # older versions
+ # caution: windows has a convert.exe for converting file systems
+ command = 'convert'
+ fout = os.popen('convert -version 2>&1')
+ output = fout.readline()
+ fout.close()
+
+version = re_version.match(output)
+
+# Imagemagick by default
+im = False
+gm = False
+
+if version is not None:
+ major = int(version.group(1))
+ minor = int(version.group(2))
+ patch = int(version.group(3))
+ version = (major, minor, patch)
+ im = True
+else:
+ # Try GraphicsMagick
+ re_version = re.compile(r'^GraphicsMagick.*http:..www.GraphicsMagick.org.*$')
+ version = re_version.match(output)
+ if version is not None:
+ gm = True
+ # we need version to be a valid integer 3-tuple
+ version = (1,0,0)
+ else:
+ version = (0,0,0)
+
+# IM >= 5.5.8 separates options for source and target files
+# See http://www.imagemagick.org/Usage/basics/#why
+if im or gm:
+ sopts = ""
+ topts = ""
+elif sys.platform == 'darwin':
+ command = 'lyxconvert'
+
+# If supported, add the -define option for pdf source formats
+if sys.argv[1] == 'pdf' and (version >= (6,2,6) or gm):
+ sopts = '-define pdf:use-cropbox=true ' + sopts
+
+# If supported, add the -flatten option for ppm target formats (see bug 4749)
+if sys.argv[3] == 'ppm' and (im and version >= (6,3,5) or gm):
+ topts = '-flatten'
+
+# print (command, sys.argv[2], sys.argv[4], file= sys.stdout)
+if (im or gm) and os.system(r'%s %s "%s" %s "%s"' % (command, sopts, sys.argv[2], topts, sys.argv[3] + ':' + sys.argv[4])) != 0:
+ print(sys.argv[0], 'ERROR', file= sys.stderr)
+ print('Execution of "%s" failed.' % command, file= sys.stderr)
+ sys.exit(1)
+elif not im and not gm and sys.platform == 'darwin' and os.system(r'%s "%s" "%s"' % (command, sys.argv[2], sys.argv[4])) != 0:
+ print(sys.argv[0], 'ERROR', file= sys.stderr)
+ print('Execution of "%s" failed.' % command, file=sys.stderr)