379 lines
13 KiB
Python
379 lines
13 KiB
Python
# Importing the module to manage the connection to the printer.
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import escpos.printer as escp
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import brother-ql-inventree
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from time import sleep, gmtime, strftime
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import os.path
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from PIL import Image, ImageEnhance, ImageOps
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import numpy as np
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class Printer(object):
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"""
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# The connection is based on the ESC/POS library
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## Connection to the USB printer
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## Making sure the printer is alive
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## Making sure it has paper
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## Define default print settings
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## Print starting message, log time of first print, cut.
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## Annonce readyness : return a positive pong message.
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"""
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# Is the printer ready to accept a new print ?
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ready = False
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def __init__(self, app, device_id, vendor_id):
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super(Printer, self).__init__()
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self.app = app
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self.ready = False
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self.printer = None
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self.device_id = device_id
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self.vendor_id = vendor_id
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self.usb_args = {}
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self.usb_args["idVendor"] = self.device_id
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self.usb_args["idProduct"] = self.vendor_id
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def check_paper(self) -> bool:
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# Let's check paper status
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self.app.logger.debug("Checking paper status...")
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self.printer.open(self.usb_args)
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status = self.printer.paper_status()
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match status:
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case 0:
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self.app.logger.error("Printer has no more paper, aborting...")
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self.printer.close()
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raise Exception("No more paper in the printer")
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case 1:
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self.app.logger.warning(
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"Printer needs paper to be changed very soon ! "
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)
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self.printer.close()
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case 2:
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self.app.logger.debug("Printer has paper, good to go")
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self.printer.close()
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def init_printer(self):
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# Is the printer online ? Is the communication with the printer successfull ?
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waiting_elapsed = 30
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self.app.logger.debug("Waiting for printer to get online...")
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while not self.ready:
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try:
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# This also calls open(), which we need to close()
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# or else the device will appear as busy.
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p = escp.Usb(self.device_id, self.vendor_id, 0, profile="TM-P80")
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except Exception as e:
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self.app.logger.error(
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"The USB device is not plugged in, trying again : " + str(e)
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)
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pass
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try:
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if p.is_online():
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self.ready = True
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self.app.logger.debug("Printer online !")
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except Exception as e:
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pass
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sleep(1)
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waiting_elapsed -= 1
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if waiting_elapsed < 1:
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self.app.logger.error(
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"Printer took more than 30 seconds to get online, aborting..."
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)
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waiting_elapsed = 1 # Reset the waiting time for the next print.
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return False
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# Setting up the printing options.
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p.set(
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align="center",
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font="a",
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bold=False,
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underline=0,
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width=1,
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height=1,
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density=9,
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invert=False,
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smooth=False,
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flip=False,
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double_width=False,
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double_height=False,
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custom_size=False,
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)
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# Beware : if we print every time the printer becomes ready, it means
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# we are printing before and after every print !
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self.printer = p
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self.ready = True
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self.printer.close()
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self.check_paper()
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return True
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def print_sms(self, msg, signature="", bold=False):
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clean_msg = str(msg) + "\n"
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clean_signature = str(signature)
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if len(clean_msg) > 4096:
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self.app.logger.warning(
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"Could not print message of this length: " + str(len(clean_msg))
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)
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raise Exception(
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"Could not print message of this length :"
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+ str(len(clean_msg))
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+ ", needs to be below 4096 caracters long."
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)
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if len(signature) > 256:
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self.app.logger.warning(
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"Could not print signature of this length: " + str(len(clean_signature))
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)
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raise Exception(
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"Could not print signature of this length :"
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+ str(len(clean_signature))
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+ ", needs to be below 256 caracters long."
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)
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try:
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self.printer.open(self.usb_args)
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self.printer.set(align="center", font="a", bold=bold)
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self.printer.textln(clean_msg)
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if clean_signature:
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self.printer.textln(clean_signature)
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self.printer.close()
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except Exception as e:
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self.app.logger.error("Unable to print because : " + str(e))
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self.app.logger.info("Printed text")
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return True
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def print_img(self, path, sign="", center=True, process=False):
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clean_signature = str(sign)
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if len(sign) > 256:
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self.app.logger.warning(
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"Could not print signature of this length: " + str(len(clean_signature))
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)
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raise Exception(
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"Could not print signature of this length :"
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+ str(len(clean_signature))
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+ ", needs to be below 256 caracters long."
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)
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if not os.path.isfile(str(path)):
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self.app.logger.warning("File does not exist : " + str(path))
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raise Exception(
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"The file path for this image :"
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+ str(path)
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+ " wasn't found. Please try again."
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)
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else:
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self.app.logger.debug("Printing file from " + str(path))
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if process:
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try:
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self.app.logger.debug("Proccessing the image")
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path = process_image(self, path)
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except Exception as e:
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self.app.logger.error(str(e))
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return False
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else:
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self.app.logger.warning("Not proccessing the image")
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try:
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self.printer.open(self.usb_args)
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self.printer.image(path, center=center)
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self.printer.close()
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self.app.logger.debug("Printed an image : " + str(path))
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os.remove(path)
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self.app.logger.debug("Removed image : " + str(path))
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except Exception as e:
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self.printer.close()
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self.app.logger.error(str(e))
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return False
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self.app.logger.info("Printed a picture")
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return True
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def qr(self, content):
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try:
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self.printer.open(self.usb_args)
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self.printer.qr(content, center=True)
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self.printer.close()
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except Exception as e:
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self.printer.close()
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self.app.logger.error(str(e))
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return False
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self.app.logger.info("Printed a QR")
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return True
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def cut(self):
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try:
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self.printer.open(self.usb_args)
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self.printer.cut()
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self.printer.close()
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except Exception as e:
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self.printer.close()
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self.app.logger.error(str(e))
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raise e
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self.app.logger.info("Did a cut")
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return True
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def process_image(self, path):
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brightness_factor = 1.5 # Used only if image is too dark
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brightness_threshold = 100 # Brightness threshold (0–255)
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contrast_factor = 0.6 # Less than 1.0 = lower contrast
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max_width = 575
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max_height = 1000
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with Image.open(path) as original_img:
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# Convert to RGB if needed (JPEG doesn't support alpha)
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if original_img.mode in ("RGBA", "P"):
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self.app.logger.debug("Converting the image to RGB from RGBA")
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original_img = original_img.convert("RGB")
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# Resize while maintaining aspect ratio
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original_img.thumbnail((max_width, max_height), Image.LANCZOS)
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self.app.logger.debug("Resized the image")
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# # Convert to grayscale for dithering
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# dithered_img = original_img.convert("L").convert("1") # Dithering using default method (Floyd–Steinberg)
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# self.app.logger.debug("Dithered the image")
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# Compute brightness of original image (grayscale average)
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grayscale = original_img.convert("L")
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avg_brightness = np.array(grayscale).mean()
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self.app.logger.debug(
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"Average brightness of the image : " + str(avg_brightness)
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)
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# Dynamically compute brightness factor if too dark
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if avg_brightness < brightness_threshold:
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brightness_factor = (
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1 + (brightness_threshold - avg_brightness) / brightness_threshold
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)
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brightness_factor = min(
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max(brightness_factor, 1.1), 2.5
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) # Clamp between 1.1 and 2.5
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self.app.logger.debug(
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f"Image too dark, increasing brightness by a factor of {brightness_factor:.2f}"
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)
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enhancer = ImageEnhance.Brightness(original_img)
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original_img = enhancer.enhance(brightness_factor)
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# # Reduce contrast
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# contrast_enhancer = ImageEnhance.Contrast(original_img)
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# original_img = contrast_enhancer.enhance(contrast_factor)
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# Final resize check
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if original_img.height > max_height:
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raise ValueError("Image is too long, sorry! Keep it below 575×1000 pixels.")
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self.app.logger.error(
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"Image is too long, sorry! Keep it below 575×1000 pixels."
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)
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return False
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# Convert to JPEG and save
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jpeg_path = os.path.splitext(path)[0] + "_processed.jpg"
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original_img.save(jpeg_path, format="JPEG", quality=95, optimize=True)
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return jpeg_path
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def discover_printers():
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"""
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We try to find all the connected printers ( 0 or n ) to this system.
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For every type of supported printer, we try to autodiscover them.
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http://www.linux-usb.org/usb.ids A list of USB vendor IDs
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04b8 Seiko Epson Corp.
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04f9 Brother Industries, Ltd
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"""
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def find_and_parse_borther_ql_printer():
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## We might be able to no use this because there is a `discover` command in https://github.com/pklaus/brother_ql#usage
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## Code stolen from https://framagit.org/stickoeur/diagnostickoeur/-/blob/no-masters/printit.py?ref_type=heads
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"""Find and parse Brother QL printer information."""
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model_manager = ModelsManager()
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# Debug print to show we're searching
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# print("Searching for Brother QL printer...")
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for backend_name in ["pyusb", "linux_kernel"]:
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try:
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#print(f"Trying backend: {backend_name}")
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backend = backend_factory(backend_name)
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available_devices = backend["list_available_devices"]()
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#print(f"Found {len(available_devices)} devices with {backend_name} backend")
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for printer in available_devices:
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#print(f"Found device: {printer}")
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identifier = printer["identifier"]
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parts = identifier.split("/")
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if len(parts) < 4:
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#print(f"Skipping device with invalid identifier format: {identifier}")
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continue
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protocol = parts[0]
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device_info = parts[2]
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serial_number = parts[3]
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try:
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vendor_id, product_id = device_info.split(":")
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except ValueError:
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#print(f"Invalid device info format: {device_info}")
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continue
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# Default model
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model = "QL-570"
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# Try to match product ID to determine actual model
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try:
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product_id_int = int(product_id, 16)
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for m in model_manager.iter_elements():
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if m.product_id == product_id_int:
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model = m.identifier
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break
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#print(f"Matched printer model: {model}")
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except ValueError:
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#print(f"Invalid product ID format: {product_id}")
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continue
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printer_info = {
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"identifier": identifier,
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"backend": backend_name,
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"model": model,
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"protocol": protocol,
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"vendor_id": vendor_id,
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"product_id": product_id,
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"serial_number": serial_number,
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}
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#print(f"Found printer: {printer_info}")
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return printer_info
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except Exception as e:
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#print(f"Error with backend {backend_name}: {str(e)}")
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continue
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print("No Brother QL printer found")
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return None
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def fint_and_parse_epson_printer():
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pass |