GIMP 2.10 plugin: redimensiona camada selecionada para tamanho da primeira camada

autoresize.py

#!/usr/bin/env python2
# coding: utf-8

from gimpfu import *

def autoresize(img, drw):
    pdb.gimp_image_undo_group_start(img)
    try:
        new_width = base_width = img.layers[-1].width
        new_height = base_height = img.layers[-1].height

        if drw.width / base_width > drw.height / base_height:
            new_height = int(drw.height / (drw.width / base_width))
        else:
            new_width = int(drw.width / (drw.height / base_height))
        pdb.gimp_layer_scale(drw, new_width, new_height, True)
    finally:
        pdb.gimp_image_undo_group_end(img)

register(
        "autoresize",
        "autoresize",
        "autoresize - autoresize current layer to fit in first image layer",
        "Joao S. O. Bueno",
        "Joao S. O. Bueno",
        "2020. GPL applies.",
        "Resample Layer to Base Layer Size",
        "*",
        [(PF_IMAGE, "Image", "Image", None), (PF_DRAWABLE, "Drawable", "Drawable", None), ],
        [],
        autoresize,
        menu="<Image>/Edit")

main()