def _get_png_info(**kw):
"""\
Returns the width, height and the pixels of the provided PNG file.
"""
reader = PNGReader(**kw)
w, h, pixels, meta = reader.asDirect()
return w, h, _make_pixel_array(pixels, meta['greyscale'])
def test_greyscale():
qr = segno.make_qr('test')
buff = io.BytesIO()
qr.save(buff, kind='png', quiet_zone='white')
buff.seek(0)
reader = PNGReader(file=buff)
reader.preamble()
assert reader.greyscale
def test_greyscale():
fn = _make_tmp_png_filename()
res = cli.main(['--quiet-zone=white', '--output={0}'.format(fn), 'test'])
with open(fn, 'rb') as f:
data = io.BytesIO(f.read())
os.unlink(fn)
assert 0 == res
reader = PNGReader(file=data)
reader.preamble()
assert reader.greyscale
def test_plte_no_transparency():
qr = segno.make_qr('test')
buff = io.BytesIO()
dark = (0, 0, 139)
light = (255, 255, 255)
qr.save(buff, kind='png', dark=dark, light=light)
buff.seek(0)
reader = PNGReader(file=buff)
reader.preamble()
assert not reader.greyscale
palette = reader.palette()
assert 2 == len(palette)
assert dark in palette
assert light in palette
def test_plte():
qr = segno.make_qr('test')
buff = io.BytesIO()
dark = (0, 0, 139)
qr.save(buff, kind='png', dark=dark, light=None)
buff.seek(0)
reader = PNGReader(file=buff)
reader.preamble()
assert not reader.greyscale
palette = reader.palette()
assert 2 == len(palette)
assert 0 == palette[0][3] # Transparent color
dark_with_alpha = dark + (255, )
assert dark_with_alpha in palette
def test_not_greyscale():
qr = segno.make_qr('test')
buff = io.BytesIO()
qr.save(buff, kind='png',
quiet_zone=None) # Three "colors": white, black, transparent
buff.seek(0)
reader = PNGReader(file=buff)
reader.preamble()
assert not reader.greyscale
palette = reader.palette()
assert 3 == len(palette)
assert 0 == palette[0][3] # Transparent color
assert (0, 0, 0, 255) in palette # black
assert (255, 255, 255, 255) in palette # white
def test_not_greyscale():
fn = _make_tmp_png_filename()
res = cli.main(
['--quiet-zone=transparent', '--output={0}'.format(fn), 'test'])
with open(fn, 'rb') as f:
data = io.BytesIO(f.read())
os.unlink(fn)
assert 0 == res
reader = PNGReader(file=data)
reader.preamble()
assert not reader.greyscale
palette = reader.palette()
assert 3 == len(palette)
assert 0 == palette[0][3] # Transparent color
assert (0, 0, 0, 255) in palette # black
assert (255, 255, 255, 255) in palette # white
def test_plte_colors():
fn = _make_tmp_png_filename()
res = cli.main([
'--quiet-zone=green', '--finder-dark=purple', '--finder-light=yellow',
'--output={0}'.format(fn), 'test'
])
with open(fn, 'rb') as f:
data = io.BytesIO(f.read())
os.unlink(fn)
assert 0 == res
reader = PNGReader(file=data)
reader.preamble()
assert not reader.greyscale
palette = reader.palette()
assert 5 == len(palette)
assert (0, 0, 0) in palette
assert (255, 255, 255) in palette
assert colors._color_to_rgb('green') in palette
assert colors._color_to_rgb('purple') in palette
assert colors._color_to_rgb('yellow') in palette
def test_issue_54_notinverted(dark, light, transparent):
qr = segno.make('The Beatles')
assert 'M4-M' == qr.designator
out = io.BytesIO()
scale = 5
qr.save(out, kind='png', scale=scale, dark=dark, light=light)
out.seek(0)
reader = PNGReader(file=out)
w, h, pixels, meta = reader.read()
width, height = qr.symbol_size(scale=scale)
assert width == w
assert height == h
assert meta['greyscale']
border_row = tuple([1] * w)
expected_row = tuple([1] * 2 * scale + [0] * 7 * scale + [1])
for idx, row in enumerate(pixels):
if idx < 10:
assert border_row == tuple(row)
elif idx == 10:
assert expected_row == tuple(row)[:len(expected_row)]
break
assert transparent == reader.transparent
def test_plte_colors():
qr = segno.make_qr('test')
buff = io.BytesIO()
dark = (0, 0, 139)
light = (255, 255, 255)
qr.save(buff,
kind='png',
dark=dark,
light=light,
quiet_zone='green',
finder_dark='purple',
finder_light='yellow')
buff.seek(0)
reader = PNGReader(file=buff)
reader.preamble()
assert not reader.greyscale
palette = reader.palette()
assert 5 == len(palette)
assert dark in palette
assert light in palette
assert colors._color_to_rgb('green') in palette
assert colors._color_to_rgb('purple') in palette
assert colors._color_to_rgb('yellow') in palette