solid_bezel.py

#!/usr/bin/env python

from gimpfu import *

def solid_bezel(image, drawable, pixels, interior):
    # If an interior face, light comes from bottom left
    outer, inner = 16, 17
    if interior:
        outer, inner = 17, 16

    pdb.gimp_image_undo_group_start(image)
    pdb.gimp_image_select_item(image, 0, drawable)

    layername = pdb.gimp_layer_get_name(drawable)

    # Base textures
    lower = image.new_layer(layername + " Lower")
    pdb.gimp_layer_set_opacity(lower, 50)
    pdb.gimp_layer_set_mode(lower, inner)
    upper = image.new_layer(layername + " Upper")
    pdb.gimp_layer_set_opacity(upper, 50)
    pdb.gimp_layer_set_mode(upper, outer)

    for i in range(1, pixels+1):

        lower_temp = pdb.gimp_layer_copy(drawable, 1)
        pdb.gimp_image_insert_layer(image, lower_temp, None, -1)
        pdb.gimp_drawable_offset(lower_temp, 1, 0, -i, i)
        upper_temp = pdb.gimp_layer_copy(drawable, 1)
        pdb.gimp_image_insert_layer(image, upper_temp, None, -1)
        pdb.gimp_drawable_offset(upper_temp, 1, 0, i, -i)

        pdb.gimp_image_select_item(image, 0, drawable)
        pdb.gimp_edit_clear(lower_temp)
        pdb.gimp_edit_clear(upper_temp)

        pdb.gimp_image_select_item(image, 0, lower)
        pdb.gimp_edit_clear(lower_temp)
        pdb.gimp_image_select_item(image, 0, upper)
        pdb.gimp_edit_clear(upper_temp)

        pdb.gimp_selection_none(image)
        pdb.gimp_edit_copy(lower_temp)
        floating = pdb.gimp_edit_paste(lower, 0)
        pdb.gimp_floating_sel_anchor(floating)
        pdb.gimp_edit_copy(upper_temp)
        floating = pdb.gimp_edit_paste(upper, 0)
        pdb.gimp_floating_sel_anchor(floating)

        pdb.gimp_image_remove_layer(image, lower_temp)
        pdb.gimp_image_remove_layer(image, upper_temp)

    pdb.gimp_drawable_offset(lower, 1, 0, pixels, -pixels)
    pdb.gimp_drawable_offset(upper, 1, 0, -pixels, pixels)

    # Clean residue
    pdb.gimp_image_select_item(image, 0, drawable)
    pdb.gimp_selection_invert(image)
    pdb.gimp_edit_clear(upper)
    pdb.gimp_edit_clear(lower)
    pdb.gimp_selection_none(image)

    pdb.gimp_image_undo_group_end(image)
    pdb.gimp_displays_flush()

register(
    'solid_bezel',
    'Solid bezel with 45` lighting',
    'Solid bezel with 45` lighting',
    'Shoeboxam',
    'Shoeboxam',
    '2017',
    "Solid Bezel",
    "*",
    [
		(PF_IMAGE, "image",       "Input image", None),
        (PF_DRAWABLE, "drawable", "Input drawable", None),
        (PF_INT, "pixels",        "Offset pixels", 1),
        (PF_BOOL, "interior",     "Interior", False)
	],
    [],
	solid_bezel,
	menu="<Image>/Filters/Custom")

main()