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#!/usr/bin/env python
from gi.repository import Gegl
import sys
if __name__ == '__main__':
Gegl.init(sys.argv)
ptn = Gegl.Node()
# Disable caching on all child nodes
ptn.set_property("cache-policy", Gegl.CachePolicy.NEVER)
# Create our background buffer. A gegl:color node would
# make more sense, we just use a buffer here as an example.
background_buffer = Gegl.Buffer.new("RGBA float", 246, -10, 276, 276)
white = Gegl.Color.new("#FFF")
background_buffer.set_color(background_buffer.get_extent(), white)
src = ptn.create_child("gegl:load")
src.set_property("path", "data/surfer.png")
crop = ptn.create_child("gegl:crop")
crop.set_property("x", 256)
crop.set_property("y", 0)
crop.set_property("width", 256)
crop.set_property("height", 256)
buffer_src = ptn.create_child("gegl:buffer-source")
buffer_src.set_property("buffer",background_buffer)
over = ptn.create_child("gegl:over")
dst = ptn.create_child("gegl:save")
dst.set_property("path", "cropped.png")
# The parent node is only for reference tracking, we need to
# connect the node's pads to actualy pass data between them.
buffer_src.connect_to("output", over, "input")
src.connect_to("output", crop, "input")
crop.connect_to("output", over, "aux")
over.connect_to("output", dst, "input")
# Will create "cropped.png" in the current directory
dst.process()
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