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#!/usr/bin/env python3
import tempfile
import unittest
from pathlib import Path
import subprocess
import os
from PIL import Image
import numpy as np
def run_svg_flatten(input_file, output_file, **kwargs):
if 'SVG_FLATTEN' in os.environ:
svg_flatten = os.environ.get('SVG_FLATTEN')
elif (Path(__file__) / '../../build/svg-flatten').is_file():
svg_flatten = '../../build/svg-flatten'
elif Path('./build/svg-flatten').is_file():
svg_flatten = './build/svg-flatten'
else:
svg_flatten = 'svg-flatten'
args = [ svg_flatten,
*(arg for (key, value) in kwargs.items() for arg in (f'--{key.replace("_", "-")}', value)),
str(input_file), str(output_file) ]
try:
proc = subprocess.run(args, capture_output=True, check=True)
except:
print('Subprocess stdout:')
print(proc.stdout)
print('Subprocess stderr:')
print(proc.stderr)
raise
class SVGRoundTripTests(unittest.TestCase):
# Notes on test cases:
# Our stroke join test shows a discrepancy in miter handling between resvg and gerbolyze. Gerbolyze's miter join is
# the one from Clipper, which unfortunately cannot be configured. resvg uses one looking like that from the SVG 2
# spec. Gerbolyze's join is legal by the 1.1 spec since this spec does not explicitly define the miter offset. It
# only contains a blurry picture, and that picture looks like what gerbolyze produces.
test_mean_default = 0.02
test_mean_overrides = {
# Both of these produce high errors for two reasons:
# * By necessity, we get some error accumulation because we are dashing the path *after* flattening, and
# flattened path length is always a tiny bit smaller than actual path length for curved paths.
# * Since the image contains a lot of edges there are lots of small differences in anti-aliasing.
# Both are expected and OK.
'stroke_dashes_comparison': 0.03,
'stroke_dashes': 0.05,
}
# Force use of rsvg-convert instead of resvg for these test cases
rsvg_override = {
# resvg is bad at rendering patterns. Both scale and offset are wrong, and the result is a blurry mess.
# See https://github.com/RazrFalcon/resvg/issues/221
'pattern_fill',
'pattern_stroke',
'pattern_stroke_dashed'
}
def compare_images(self, reference, output, test_name, mean, rsvg_workaround=False):
ref = np.array(Image.open(reference))
out = np.array(Image.open(output))
if rsvg_workaround:
# For some stupid reason, rsvg-convert does not actually output black as in "black" pixels when asked to.
# Instead, it outputs #010101. We fix this in post here.
ref = (ref - 1.0) * (255/254)
delta = np.abs(out - ref).astype(float) / 255
#def print_stats(ref):
# print('img:', ref.min(), ref.mean(), ref.max(), 'std:', ref.std(), 'channels:', *(ref[:,:,i].mean() for i in
# range(ref.shape[2])))
#print_stats(ref)
#print_stats(out)
#print(f'{test_name}: mean={delta.mean():.5g}')
self.assertTrue(delta.mean() < mean,
f'Expected mean pixel difference between images to be <{mean}, was {delta.mean():.5g}')
def run_svg_round_trip_test(self, test_in_svg):
with tempfile.NamedTemporaryFile(suffix='.svg') as tmp_out_svg,\
tempfile.NamedTemporaryFile(suffix='.png') as tmp_out_png,\
tempfile.NamedTemporaryFile(suffix='.png') as tmp_in_png:
run_svg_flatten(test_in_svg, tmp_out_svg.name, format='svg')
use_rsvg = test_in_svg.stem in SVGRoundTripTests.rsvg_override
if not use_rsvg: # default!
subprocess.run(['resvg', tmp_out_svg.name, tmp_out_png.name], check=True, stdout=subprocess.DEVNULL)
subprocess.run(['resvg', test_in_svg, tmp_in_png.name], check=True, stdout=subprocess.DEVNULL)
else:
subprocess.run(['rsvg-convert', tmp_out_svg.name, '-f', 'png', '-o', tmp_out_png.name], check=True, stdout=subprocess.DEVNULL)
subprocess.run(['rsvg-convert', test_in_svg, '-f', 'png', '-o', tmp_in_png.name], check=True, stdout=subprocess.DEVNULL)
try:
self.compare_images(tmp_in_png, tmp_out_png, test_in_svg.stem,
SVGRoundTripTests.test_mean_overrides.get(test_in_svg.stem, SVGRoundTripTests.test_mean_default),
rsvg_workaround=use_rsvg)
except AssertionError as e:
import shutil
shutil.copyfile(tmp_in_png.name, f'/tmp/gerbolyze-fail-{test_in_svg.stem}-in.png')
shutil.copyfile(tmp_out_png.name, f'/tmp/gerbolyze-fail-{test_in_svg.stem}-out.png')
foo = list(e.args)
foo[0] += '\nFailing test renderings copied to:\n'
foo[0] += f' /tmp/gerbolyze-fail-{test_in_svg.stem}-{{in|out}}.png\n'
e.args = tuple(foo)
raise e
for test_in_svg in Path('testdata/svg').glob('*.svg'):
# We need to make sure we capture the loop variable's current value here.
gen = lambda testcase: lambda self: self.run_svg_round_trip_test(testcase)
setattr(SVGRoundTripTests, f'test_{test_in_svg.stem}', gen(test_in_svg))
if __name__ == '__main__':
unittest.main()
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