gimp python-fu创建简单边框

Question

所以我正在用python做我的第一个gimp插件。到目前为止，它是正常工作的：

它首先为边框创建一个第二层，然后调整它的大小以适应画布，然后选择活动层的轮廓(“正常”GIMP中的Alpha to Selection )，给它加上边框，移除活动层的轮廓以保留层上的像素，然后它将边界增大1，锐化它并填充它。

但有时它似乎选择了整个层，而不是它的轮廓，这是一个GIMP错误，还是我做错了什么？

#!/usr/bin/env python

from gimpfu import *
import time

def white_box(img, drawable, thickness = 5, layer = None):

    pdb.plug_in_autocrop_layer(img, drawable)

    # layer = pdb.gimp_image_get_active_layer(img)  
    box = pdb.gimp_layer_new(img, 1, 1, 1, pdb.gimp_item_get_name(layer) + "_white box", 100, 0)
    pdb.gimp_image_insert_layer(img, box, None, -1)

    pdb.gimp_layer_resize_to_image_size(box)
    # pdb.gimp_layer_resize_to_image_size(layer)

    pdb.gimp_image_select_item(img, 0, layer)
    pdb.gimp_message("Selected layer")
    # pdb.gimp_edit_fill(drawable, 2)
    time.sleep(1)


    pdb.gimp_selection_border(img, thickness)
    pdb.gimp_message("Selected a border with a thickness of " + str(thickness))
    time.sleep(1)

    pdb.gimp_image_select_item(img, 1, layer)
    pdb.gimp_message("Removed layer from selection")
    time.sleep(1)

    pdb.gimp_selection_grow(img, 1) 
    pdb.gimp_message("Grew selection")
    time.sleep(1)

    pdb.gimp_selection_sharpen(img)
    pdb.gimp_message("Sharpened")
    time.sleep(1)

    pdb.gimp_image_set_active_layer(img, box)

    pdb.gimp_edit_fill(pdb.gimp_image_get_active_drawable(img), 2)

    pdb.plug_in_autocrop_layer(img, drawable)
    pdb.plug_in_autocrop_layer(img, pdb.gimp_image_get_active_drawable(img))

register(
    "python_fu_white_box",
    "Create White Box",
    "Create a white box around active layer",
    "Misha Smit",
    "Misha Smit",
    "2018",
    "White Box...",
    "RGBA",      # Create a new image, don't work on an existing one
    [
        (PF_IMAGE, "img", "Image", None),
        (PF_DRAWABLE, "drawable", "Drawable", None),
        (PF_INT, "thickness", "Box Thickness", 5),
        (PF_LAYER, "layer", "LAYER:", None)
    ],
    [],
    white_box, menu="<Image>/Filters/Render")

main()

Answer 1

您的代码显示出一些关于层的混淆。脚本的"drawable“参数是脚本被调用时的活动层，所以你并不真的需要额外的" layer”参数，考虑一下"drawable“作为你的层(你甚至可以重命名函数参数)。

此外，在盒层下面添加盒层会更快/更干净，所以不需要移除任何东西(盒层隐藏了盒层的内部)：

#!/usr/bin/env python

from gimpfu import *
import time

def white_box(img, layer, thickness = 5):

    pdb.plug_in_autocrop_layer(img, layer)

    # Create the box layer with the image size
    box = pdb.gimp_layer_new(img, img.width,img.height, RGBA_IMAGE, layer.name + "_white box", 100, NORMAL_MODE)
    # Insert it **below** the boxed layer
    pdb.gimp_image_insert_layer(img, box, None, 1+pdb.gimp_image_get_item_position(img, layer)) 
    pdb.gimp_image_select_item(img, 0, layer)
    print("Selected layer")

    pdb.gimp_selection_grow(img, thickness)

    #pdb.gimp_selection_sharpen(img)
    #print("Sharpened")

    pdb.gimp_edit_fill(box, 2)

    pdb.plug_in_autocrop_layer(img,box)

register(
    "python_fu_white_box",
    "Create White Box",
    "Create a white box around active layer",
    "Misha Smit",
    "Misha Smit",
    "2018",
    "White Box...",
    "RGBA",     
    [
        (PF_IMAGE, "img", "Image", None),
        (PF_DRAWABLE, "drawable", "Drawable", None),
        (PF_INT, "thickness", "Box Thickness", 5),
    ],
    [],
    white_box, menu="<Image>/Test/")

main()

除非您真的想要圆角，否则更快的方法是使用盒层的宽度/高度加上厚度*2来创建盒层，然后使用层偏移来定位它((-thickness，-thickness)相对于盒层偏移)。然后把桶装满..。