78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
import json
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from typing import Dict, List, Optional
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from zlib import compress, decompress
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from base45 import b45decode, b45encode
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from PIL import Image, ImageChops, ImageDraw
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from pyzbar import pyzbar
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from qrcode.constants import ERROR_CORRECT_L
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from qrcode.main import QRCode
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QRCODE_SIZE = 215
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GAP_SIZE = 16
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BLACK = (0, 0, 0)
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WHITE = (255, 255, 255)
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TOP = 40
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BOTTOM = 995
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LEFT = 40
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def encode(data: str, n: int = 16, theme: str = "light") -> List[Image.Image]:
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data = b45encode(compress(data.encode("utf-8"), level=9))
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length = len(data)
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split: List[bytes] = []
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for i in range(n):
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start = length // n * i
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end = length if i == n - 1 else length // n * (i + 1)
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split.append(data[start:end])
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result: List[Image.Image] = []
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qr = QRCode(error_correction=ERROR_CORRECT_L)
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fg, bg = (BLACK, WHITE) if theme == "light" else (WHITE, BLACK)
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for i in split:
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qr.add_data(i)
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img: Image.Image = qr.make_image(fill_color=fg, back_color=bg)
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result.append(trim(img.get_image()))
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qr.clear()
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return result
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def trim(img: Image.Image) -> Image.Image:
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bg = Image.new(img.mode, img.size, img.getpixel((0, 0)))
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diff = ImageChops.difference(img, bg)
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img = img.crop(diff.getbbox())
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img = img.resize((QRCODE_SIZE, QRCODE_SIZE))
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return img
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def export(plan: Dict, img: Image.Image, theme: str = "light") -> Image.Image:
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qrcode_list = encode(json.dumps(plan), theme=theme)
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for idx, i in enumerate(qrcode_list[:7]):
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img.paste(i, (LEFT + idx * (GAP_SIZE + QRCODE_SIZE), TOP))
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for idx, i in enumerate(qrcode_list[7:14]):
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img.paste(i, (LEFT + idx * (GAP_SIZE + QRCODE_SIZE), BOTTOM))
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for idx, i in enumerate(qrcode_list[14:]):
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img.paste(i, (2520 + idx * (GAP_SIZE + QRCODE_SIZE), BOTTOM))
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img = img.convert("RGB")
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return img
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def decode(img: Image.Image) -> Optional[Dict]:
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img = img.convert("RGB")
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if img.getpixel((0, 0))[0] < 127:
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img = ImageChops.invert(img)
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result = []
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while len(data := pyzbar.decode(img)):
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img1 = ImageDraw.Draw(img)
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for d in data:
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if d.quality > 1:
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continue
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left = d.rect.left - 2
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top = d.rect.top - 2
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right = left + d.rect.width + 5
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bottom = top + d.rect.height + 5
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scope = ((left, top), (right, bottom))
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img1.rectangle(scope, fill=WHITE)
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result.append(d)
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result.sort(key=lambda i: (i.rect.top * 2 > img.size[1], i.rect.left))
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result = b45decode(b"".join([i.data for i in result]))
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return json.loads(decompress(result).decode("utf-8"))
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