#!/usr/bin/env python
# Author: Chris Mohler
# Copyright 2011 Chris Mohler
# License: GPL v3+
# Version 0.1.1
# cross_process.py
# GIMP plugin to do a cross-process effect
# based on tutorial by jEsuSdA:
# http://www.jesusda.com/blog/index.php?id=375

from gimpfu import *
from random import randint

gettext.install("gimp20-python", gimp.locale_directory, unicode=True)

RED = 1
GREEN = 2
BLUE = 3
OVERLAY = 5
FOREGROUND = 0

def rint(jitter, int):
	i = randint(-jitter,jitter) + int
	if i < 0: i = 0
	if i > 255: i = 255
	return i

def cross_process(img, drw, contrast=50.0, 
					tint=10.0, color=(0,255,186), jitter=0):
	
	img.undo_group_start()
	j = jitter
	pdb.gimp_curves_spline(drw, RED, 10,  (0, 0, 
										   rint(j, 88), rint(j, 47), 
										   rint(j,170), rint(j,188), 
										   rint(j,221), rint(j,249), 
										   255, 255))
	pdb.gimp_curves_spline(drw, GREEN, 8, (0, 0,
										   rint(j, 65), rint(j, 57), 
										   rint(j,184), rint(j,208),
										   255, 255))
	pdb.gimp_curves_spline(drw, BLUE, 4,  (0, rint(j,29),
										   255, rint(j,226)))

	contrast_lyr = img.active_layer.copy()
	contrast_lyr.mode = OVERLAY
	contrast_lyr.opacity = contrast
	img.add_layer(contrast_lyr)

	fg = gimp.get_foreground()
	gimp.set_foreground(color)
	tint_lyr = img.new_layer()
	tint_lyr.fill(FOREGROUND)
	tint_lyr.mode = OVERLAY
	tint_lyr.opacity = tint
	gimp.set_foreground(fg)

	img.flatten()
	img.undo_group_end()
    
register(
    proc_name=("python-fu-cross-process"),
    blurb=("Cross-Process effect"),
    help=("Mimics tinting effect of cross-processing."),
    author=("Chris Mohler"),
    copyright=("Chris Mohler"),
    date=("2011"),
    label=("Cross-Process"),
    imagetypes=("RGB*"),
    params=[
	(PF_IMAGE, "img", "Image", None),
	(PF_DRAWABLE, "drw", "Drawable", None),
	(PF_SLIDER, "contrast", "Added contrast", 50.0, (0.0, 100.0, 0.1)),
	(PF_SLIDER, "tint", "Tint opacity", 10.0, (0.0, 100.0, 0.1)),
	(PF_COLOR, "color", "Tint Color", (0,255,186)),
	(PF_SLIDER, "jitter", "Randomness", 0, (0, 20, 1)),
	   ],
    results=[],
    function=(cross_process), 
    menu=("<Image>/Filters/Artistic"), 
    domain=("gimp20-python", gimp.locale_directory)
    )

main()