quick and dirty image merger

image_merger.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# License: MIT
#quick and dirty image merger
#gimp -ib '(python-copy2a4 RUN-NONINTERACTIVE "~/pics" "inv_*.png" "~/pics")''(gimp-quit 0)'
import os, re, glob
from gimpfu import *
from gimpenums import *

# our script
def copy2a4(in_dir, glob_pattern, out_dir) :
    if not out_dir:
      out_dir = in_dir

    pdb.gimp_message("Globbing: " + in_dir + os.sep + glob_pattern)
    glob_result = pdb.file_glob(in_dir + os.sep + glob_pattern,  1)
    if glob_result[0] == 0:
      pdb.gimp_message("No files found in " + in_dir)
      return

    pdb.gimp_message("Make A4 with in_dir[" + in_dir + "] and out_dir[" + out_dir + "]")
    curr_height = 0
    in_files = sorted(glob_result[1]);
    for curr_file in in_files:
      in_image = pdb.gimp_file_load(curr_file,  curr_file)

      curr_height_tmp = curr_height + in_image.height

      if curr_height_tmp > 3508:
        save_image(out_image)
        pdb.gimp_image_delete(out_image)
        curr_height = 0

      if curr_height == 0:
        out_image = create_blank_image()
        out_image.filename = out_dir + os.sep + "out_" + os.path.basename(in_image.filename) + ".png"

      in_layer = pdb.gimp_layer_new_from_visible(in_image, out_image, os.path.basename(in_image.filename))

      out_image.add_layer(in_layer, 0)
      in_layer.set_offsets(0, curr_height)
      pdb.gimp_message("in_image.filename = " + os.path.basename(in_image.filename))
      pdb.gimp_message("curr_height = " + str(curr_height))

      curr_height = curr_height_tmp


      if in_files[-1] == curr_file:
        save_image(out_image)

      pdb.gimp_image_delete(in_image)


    return

def save_image(image):
  pdb.gimp_image_merge_visible_layers(image, CLIP_TO_IMAGE)
  pdb.file_png_save2(image, image.active_layer, image.filename, image.filename, 0, 9, 0, 0 , 0, 0, 0, 0, 1)
  return

def create_blank_image():
    out_image = gimp.Image(2480, 3508, RGB);
    #set background to black
    pdb.gimp_context_set_background((255,255,255))
    #add layer with 100% of opacity
    layer=pdb.gimp_layer_new(out_image, out_image.width, out_image.height, RGB_IMAGE, "base", 100, NORMAL_MODE)
    pdb.gimp_image_add_layer(out_image, layer, 0)
    #we need it with alpha channel
    pdb.gimp_layer_add_alpha(layer)
    #access its drawable
    drw = pdb.gimp_image_active_drawable(out_image)
    #fill the background - black
    pdb.gimp_drawable_fill(drw, BACKGROUND_FILL)
    return out_image

# This is the plugin registration function
register(
    "python_copy2a4",    
    "Copy to A4 300dpi",   
    "Copy to A4 300dpi (2480x3508px)",
    "bademux",
    "",
    "2015",
   "<Toolbox>/Wedding/Copy to A4",
    "",
    [
        (PF_DIRNAME, "in_file", "Input Dir", ""),
        (PF_STRING, "glob_pattern", "glob pattern", "inv_*.png"),
        (PF_FILENAME, "out_dir", "OutputFile", ""),
    ],  
    [],
    copy2a4,
)

main()