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Add invert polarity test

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Fixes gitlab issue #6
This commit is contained in:
jaseg 2026-03-09 16:07:37 +01:00
parent 3d0ddc3dc8
commit 1a0f519720
1 changed files with 26 additions and 0 deletions
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26
tests/test_rs274x.py
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@ -614,3 +614,29 @@ def test_syntax_error():
assert 'test_syntax_error.gbr' in exc_info.value.msg
assert '7' in exc_info.value.msg # lineno
@filter_syntax_warnings
@pytest.mark.parametrize('reference', MIN_REFERENCE_FILES, indirect=True)
def test_invert_polarity(reference, tmpfile, img_support):
tmp_gbr = tmpfile('Output gerber', '.gbr')
gbr = GerberFile.open(reference)
ref_svg = tmpfile('Reference SVG export', '.svg')
with open(ref_svg, 'w') as f:
f.write(str(gbr.to_svg(arg_unit='inch', fg='black', bg='white')))
ref_png = tmpfile('Reference render', '.png')
img_support.svg_to_png(ref_svg, ref_png, dpi=300, bg='white')
gbr.invert_polarity()
out_svg = tmpfile('Output SVG export', '.svg')
with open(out_svg, 'w') as f:
f.write(str(gbr.to_svg(arg_unit='inch', fg='white', bg='black')))
out_png = tmpfile('Reference render', '.png')
img_support.svg_to_png(out_svg, out_png, dpi=300, bg='white')
cx, cy = 0, to_gerbv_svg_units(10, unit='inch')
mean, _max, hist = img_support.image_difference(ref_png, out_png, diff_out=tmpfile('Difference', '.png'))
assert mean < 1e-3
assert hist[9] == 0