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import abc
from typing import TYPE_CHECKING, Any, Dict, Optional, Tuple, Type, Union
from qrcode.image.styles.moduledrawers.base import QRModuleDrawer
if TYPE_CHECKING:
from qrcode.main import ActiveWithNeighbors, QRCode
DrawerAliases = Dict[str, Tuple[Type[QRModuleDrawer], Dict[str, Any]]]
class BaseImage:
"""
Base QRCode image output class.
"""
kind: Optional[str] = None
allowed_kinds: Optional[Tuple[str]] = None
needs_context = False
needs_processing = False
needs_drawrect = True
def __init__(self, border, width, box_size, *args, **kwargs):
self.border = border
self.width = width
self.box_size = box_size
self.pixel_size = (self.width + self.border * 2) * self.box_size
self.modules = kwargs.pop("qrcode_modules")
self._img = self.new_image(**kwargs)
self.init_new_image()
@abc.abstractmethod
def drawrect(self, row, col):
"""
Draw a single rectangle of the QR code.
"""
def drawrect_context(self, row: int, col: int, qr: "QRCode"):
"""
Draw a single rectangle of the QR code given the surrounding context
"""
raise NotImplementedError("BaseImage.drawrect_context") # pragma: no cover
def process(self):
"""
Processes QR code after completion
"""
raise NotImplementedError("BaseImage.drawimage") # pragma: no cover
@abc.abstractmethod
def save(self, stream, kind=None):
"""
Save the image file.
"""
def pixel_box(self, row, col):
"""
A helper method for pixel-based image generators that specifies the
four pixel coordinates for a single rect.
"""
x = (col + self.border) * self.box_size
y = (row + self.border) * self.box_size
return (
(x, y),
(x + self.box_size - 1, y + self.box_size - 1),
)
@abc.abstractmethod
def new_image(self, **kwargs) -> Any:
"""
Build the image class. Subclasses should return the class created.
"""
def init_new_image(self):
pass
def get_image(self, **kwargs):
"""
Return the image class for further processing.
"""
return self._img
def check_kind(self, kind, transform=None):
"""
Get the image type.
"""
if kind is None:
kind = self.kind
allowed = not self.allowed_kinds or kind in self.allowed_kinds
if transform:
kind = transform(kind)
if not allowed:
allowed = kind in self.allowed_kinds
if not allowed:
raise ValueError(f"Cannot set {type(self).__name__} type to {kind}")
return kind
def is_eye(self, row: int, col: int):
"""
Find whether the referenced module is in an eye.
"""
return (
(row < 7 and col < 7)
or (row < 7 and self.width - col < 8)
or (self.width - row < 8 and col < 7)
)
class BaseImageWithDrawer(BaseImage):
default_drawer_class: Type[QRModuleDrawer]
drawer_aliases: DrawerAliases = {}
def get_default_module_drawer(self) -> QRModuleDrawer:
return self.default_drawer_class()
def get_default_eye_drawer(self) -> QRModuleDrawer:
return self.default_drawer_class()
needs_context = True
module_drawer: "QRModuleDrawer"
eye_drawer: "QRModuleDrawer"
def __init__(
self,
*args,
module_drawer: Union[QRModuleDrawer, str, None] = None,
eye_drawer: Union[QRModuleDrawer, str, None] = None,
**kwargs,
):
self.module_drawer = (
self.get_drawer(module_drawer) or self.get_default_module_drawer()
)
# The eye drawer can be overridden by another module drawer as well,
# but you have to be more careful with these in order to make the QR
# code still parseable
self.eye_drawer = self.get_drawer(eye_drawer) or self.get_default_eye_drawer()
super().__init__(*args, **kwargs)
def get_drawer(
self, drawer: Union[QRModuleDrawer, str, None]
) -> Optional[QRModuleDrawer]:
if not isinstance(drawer, str):
return drawer
drawer_cls, kwargs = self.drawer_aliases[drawer]
return drawer_cls(**kwargs)
def init_new_image(self):
self.module_drawer.initialize(img=self)
self.eye_drawer.initialize(img=self)
return super().init_new_image()
def drawrect_context(self, row: int, col: int, qr: "QRCode"):
box = self.pixel_box(row, col)
drawer = self.eye_drawer if self.is_eye(row, col) else self.module_drawer
is_active: Union[bool, ActiveWithNeighbors] = (
qr.active_with_neighbors(row, col)
if drawer.needs_neighbors
else bool(qr.modules[row][col])
)
drawer.drawrect(box, is_active)