more general GM setup for testing image filtering -- now with checkerboards, images, and text.

tools/image_to_byte_array.py

+'''
+convert an image to an rgba array
+
+Launch with --help to see more information.
+
+Copyright 2013 Google Inc.
+
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+'''
+
+import Image
+import optparse
+import sys
+
+def DumpImage(filename, write_path, variable_name):
+  if not write_path:
+    outfile = sys.stdout
+  else:
+    try:
+      outfile = open( write_path, 'w' )
+    except:
+      raise BaseException( "Couldn't open output path %s" % write_path )
+  
+  infile = Image.open( filename )
+  
+  image_size = infile.size
+  
+  coordinates = [(x,y) for y in range(image_size[1]) for x in range(image_size[0])]
+  
+  colors = map( lambda xy: infile.getpixel(xy) + (255,) , coordinates )
+  values = [str(value) for color in colors for value in color]
+  
+  print >> outfile, "unsigned char %s[] = {" % variable_name
+  print >> outfile, ', '.join(values)
+  print >> outfile, "};"
+  
+  if write_path:
+    outfile.close()
+
+def Main(options, args):
+  num_args = len(args)
+  if num_args != 1:
+    raise BaseException("missing image filename")
+  DumpImage(args[0], write_path=options.write_path, variable_name=options.variable_name)
+
+if __name__ == '__main__':
+    parser = optparse.OptionParser(usage=r"usage: %prog [options] imagefile")
+    parser.add_option('-w', '--write-path',
+                      action='store', type='string', default='',
+                      help='Path to write the output scanline [default stdout]')
+    parser.add_option('-v', '--variable-name',
+                      action='store', type='string', default='image_bytes',
+                      help=r'Path to write the output scanline [default %default]')
+
+    (options, args) = parser.parse_args()
+    Main(options, args)