#!/usr/bin/env python

# Install it in your ~/.gimp/plug-ins/ directory (Could be something like ~/.gimp-2.6/plug-ins).

from gimpfu import *

def composite(image, tdrawable, background, scale, normalize):

		pdb.gimp_image_undo_group_start(image)

		# Will make all layers transparent. So the totall is 100%
		for i in image.layers:
			x = 100.0 / len(image.layers)
			if scale is True:
				pdb.gimp_layer_scale(i,image.width,image.height,TRUE)
				pdb.gimp_layer_set_opacity(i,x)


		if normalize is True:
			# Add a new layer
			newlayer = pdb.gimp_layer_new(image, image.width, image.height, 0, 'newlayer', 100, 0)
			pdb.gimp_image_add_layer(image, newlayer, 1)

			# colourise layer
			pdb.gimp_context_set_background(background)
			pdb.gimp_drawable_fill(newlayer, 1)

			# Send layer to bottom
			pdb.gimp_image_lower_layer_to_bottom(image, newlayer)

			# Merge visible layers
			image.merge_visible_layers(0)

			# Normalise colours
			pdb.plug_in_normalize(image,image.layers[0])

		pdb.gimp_image_undo_group_end(image)


register(
    "composite",    
    "Combine (two or more layers) to make a single picture",   
    "Combine (two or more layers) to make a single picture",
    "Mostafa Hussein", 
    "Mostafa Hussein", 
    "Aug 2011",
    "<Image>/MyScripts/Composite", 
    "*", 
    [
	(PF_COLOR, "background", "Background", (255, 255, 255)),
	(PF_TOGGLE, "scale", "Scale", True),
	(PF_TOGGLE, "normalize", "Merge and Normalize", True)
    ], 
    [],
    composite,
    )

main()