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#!/usr/bin/env python

import sys

################################################################################
# image stuff and convenience functions

import Image

def width(im):
  return im.size[0]

def height(im):
  return im.size[1]

def aspect(im):
  return 1.0*width(im)/height(im)

################################################################################

if __name__ == "__main__":

  ########################################
  # handle command line args

  if len(sys.argv) != 1+2:
    print "usage: %s background.png outfile.png" % sys.argv[0]
    exit()

  bgFilename= sys.argv[1]
  outFilename= sys.argv[2]

  ########################################
  # load image and logo

  bg = Image.open(bgFilename)
  if bg.mode != "RGBA":
    bg = bg.convert("RGBA")

  lg = Image.open("SLAC_Logo_hires.png")
  if lg.mode != "RGBA":
    lg = lg.convert("RGBA")


  ########################################
  # make frame the desired size

  scale= 1280/float(width(bg))

  bg_width  = int(scale*width(bg))
  bg_height = int(scale*height(bg))
  bg = bg.resize((bg_width, bg_height), Image.ANTIALIAS)

  ########################################
  # apply the logo

  # make logo the desired size
  logo_height = int(200*scale)

  logo_width = int(aspect(lg)*logo_height)
  logo = lg.resize((logo_width, logo_height), Image.ANTIALIAS)

  # figure out pixel offsets
  xo= width(bg)-width(logo) -10
  yo= height(bg)-height(logo) -10

  # slap it on the logo onto the background
  bg.paste(logo, (xo, yo), logo)


  # uncomment the ## don't need alpha channel any more
  #bg= bg.convert("RGB")
show() to see image directly on the screen.
  # this is useful for debugging.  Be sure it's commented out
  # again before running a batch job from the makefile, because you'll
  # be drowned in images popping up!
  #bg.show()

  bg.save(outFilename)