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from itertools import chain
import png
import qrcode.image.base
class PyPNGImage(qrcode.image.base.BaseImage):
"""
pyPNG image builder.
"""
kind = "PNG"
allowed_kinds = ("PNG",)
needs_drawrect = False
def new_image(self, **kwargs):
return png.Writer(self.pixel_size, self.pixel_size, greyscale=True, bitdepth=1)
def drawrect(self, row, col):
"""
Not used.
"""
def save(self, stream, kind=None):
if isinstance(stream, str):
stream = open(stream, "wb")
self._img.write(stream, self.rows_iter())
def rows_iter(self):
yield from self.border_rows_iter()
border_col = [1] * (self.box_size * self.border)
for module_row in self.modules:
row = (
border_col
+ list(
chain.from_iterable(
([not point] * self.box_size) for point in module_row
)
)
+ border_col
)
for _ in range(self.box_size):
yield row
yield from self.border_rows_iter()
def border_rows_iter(self):
border_row = [1] * (self.box_size * (self.width + self.border * 2))
for _ in range(self.border * self.box_size):
yield border_row
# Keeping this for backwards compatibility.
PymagingImage = PyPNGImage