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#!/usr/bin/env python3
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# Diffs two PDF pages: a reference and our own output. Red output means some to fix: the amount of
# red is meant to reduce as fixing progresses. Sample usage:
#
# bin/diff-pdf-page.py reference.pdf test.pdf diff.png
import argparse
import tempfile
import subprocess
def run(argv):
print(" ".join(argv))
subprocess.run(argv, check=True)
def main():
parser = argparse.ArgumentParser(description="Diffs two PDF pages, first is painted red instead of black, the second is painted on top of the first.")
parser.add_argument("-d", "--density", default="384")
parser.add_argument("-p", "--page", default="0")
parser.add_argument("a_pdf")
parser.add_argument("b_pdf")
parser.add_argument("diff_png")
args = parser.parse_args()
a_png = tempfile.NamedTemporaryFile(suffix=".png")
a_pdf = args.a_pdf + "[" + args.page + "]"
run(["convert", "-density", args.density, a_pdf, "-colorspace", "RGB", "-fuzz", "95%", "-fill", "red", "-opaque", "black", a_png.name])
b_png = tempfile.NamedTemporaryFile(suffix=".png")
b_pdf = args.b_pdf + "[" + args.page + "]"
run(["convert", "-density", args.density, b_pdf, "-colorspace", "RGB", b_png.name])
composite_png = tempfile.NamedTemporaryFile(suffix=".png")
run(["convert", "-composite", a_png.name, b_png.name, composite_png.name])
run(["convert", composite_png.name, "-background", "white", "-flatten", args.diff_png])
if __name__ == "__main__":
main()
# vim:set shiftwidth=4 softtabstop=4 expandtab:
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