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April 21, 2017 09:39
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GIMP+Python-Fuでcairo(pycairo)を使って描画するスクリプト、の雛形
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#!/usr/bin/env python | |
# -*- mode: python; Encoding: utf-8; coding: utf-8 -*- | |
# Last updated: <2017/04/21 18:35:47 +0900> | |
u""" | |
Python-Fu cairo draw example | |
usage: Filter -> Python-Fu -> Cairo draw example | |
Author : mieki256 | |
License : CC0 / Public Domain | |
testing environment : | |
* GIMP 2.8.20 Portable + Windows10 x64 | |
* GIMP 2.8.16 + Ubuntu Linux 16.04 LTS | |
""" | |
from gimpfu import * | |
import cairo | |
import struct | |
import random | |
def get_rgba_str(src): | |
"""convert cairo surface data to RGBA.""" | |
rgba_buf = "" | |
l = len(src) | |
for i in range(l / 4): | |
i0 = i * 4 | |
i1 = i0 + 4 | |
bgra = struct.unpack('=L', src[i0: i1])[0] | |
a = (bgra >> 24) & 0x0ff | |
r = (bgra >> 16) & 0x0ff | |
g = (bgra >> 8) & 0x0ff | |
b = bgra & 0x0ff | |
rgba = struct.pack('4B', r, g, b, a) | |
rgba_buf += rgba | |
return rgba_buf | |
def draw_by_cairo(surface, w, h): | |
"""draw by cairo.""" | |
ctx = cairo.Context(surface) | |
ctx.set_antialias(cairo.ANTIALIAS_NONE) | |
ctx.set_line_width(1.0) | |
ctx.set_line_join(cairo.LINE_JOIN_MITER) | |
ctx.set_line_cap(cairo.LINE_CAP_SQUARE) | |
l = random.randint(16, 64) | |
for i in range(l): | |
r = random.random() | |
g = random.random() | |
b = random.random() | |
ctx.set_source_rgb(r, g, b) | |
rx = random.randint(0, w / 2) | |
ry = random.randint(0, h / 2) | |
rw = random.randint(1, w / 2) | |
rh = random.randint(1, h / 2) | |
ctx.rectangle(rx, ry, rw, rh) | |
ctx.fill_preserve() | |
ctx.set_source_rgb(0, 0, 0) | |
ctx.stroke() | |
return surface | |
def python_fu_cairo_draw_example_main(img, layer, w, h, | |
createtype, layername, rnd_on, seed): | |
"""main func.""" | |
w = int(w) | |
h = int(h) | |
if rnd_on: | |
random.seed() | |
else: | |
random.seed(int(seed)) | |
if createtype == "Image": | |
img = gimp.Image(w, h, RGB) | |
gimp.Display(img) | |
layer = gimp.Layer(img, layername, w, h, RGBA_IMAGE, 100, NORMAL_MODE) | |
layer.fill(TRANSPARENT_FILL) | |
img.add_layer(layer, 0) | |
# draw cairo | |
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h) | |
draw_by_cairo(surface, w, h) | |
# transfer gimp layer | |
src = surface.get_data() | |
dst = get_rgba_str(src) | |
rgn = layer.get_pixel_rgn(0, 0, w, h, True, True) | |
rgn[0:w, 0:h] = str(dst) | |
layer.flush() | |
layer.merge_shadow() | |
layer.update(0, 0, w, h) | |
pdb.gimp_displays_flush() | |
# gimp.message("Done.") | |
register( | |
"python_fu_cairo_draw_example", | |
"cairo draw example", | |
"cairo draw example by Python-Fu", | |
"Your name", | |
"Your name", | |
"2017/04/21", | |
"Cairo draw example", # menu name | |
"RGB*", # Alternately use RGB, RGB*, GRAY*, INDEXED etc. | |
# params | |
[ | |
# (type, name, description, default [, extra]) | |
(PF_IMAGE, "timg", "Input image", None), | |
(PF_DRAWABLE, "tdrawable", "Input drawable", None), | |
(PF_SPINNER, "width", "Width", 512, (8, 8192, 1)), | |
(PF_SPINNER, "height", "Height", 512, (8, 8192, 1)), | |
(PF_RADIO, "createtype", "Create", "Image", | |
(("Image", "Image"), ("Layer", "Layer"))), | |
(PF_STRING, "layername", "Layer name", 'cairo_draw_layer'), | |
(PF_TOGGLE, "randomize", "Randomize:", 1), | |
(PF_INT, "seed", "Random seed", 0) | |
], | |
# return vals | |
[], | |
python_fu_cairo_draw_example_main, # function name | |
menu="<Image>/Filters/Languages/Python-Fu" | |
) | |
main() |
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