Merge github.com:python-escpos/python-escpos-1 into davisgoglin-merge
This commit is contained in:
Davis Goglin
commit
2fb27eabe2
162
escpos/escpos.py
162
escpos/escpos.py
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@ -6,15 +6,14 @@
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@license: GNU GPL v3
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"""
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try:
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import Image
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except ImportError:
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from PIL import Image
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from PIL import Image, ImageOps
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import struct
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import qrcode
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import time
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import textwrap
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import binascii
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import operator
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from .constants import *
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from .exceptions import *
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@ -59,99 +58,85 @@ class Escpos(object):
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else:
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return (round(image_border / 2), round((image_border / 2) + 1))
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def _print_image(self, line, size):
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def _print_image(self, imagedata, n_rows, col_bytes):
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""" Print formatted image
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:param line:
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:param size:
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"""
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i = 0
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cont = 0
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pbuffer = ""
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self._raw(S_RASTER_N)
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pbuffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1] & 0xff, size[1] >> 8)
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self._raw(binascii.unhexlify(pbuffer))
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pbuffer = struct.pack('<HH', col_bytes, n_rows)
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self._raw(pbuffer)
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self._raw(imagedata)
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pbuffer = ""
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while i < len(line):
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hex_string = int(line[i:i+8], 2)
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pbuffer += "%02X" % hex_string
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i += 8
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cont += 1
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if cont % 4 == 0:
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self._raw(binascii.unhexlify(pbuffer))
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pbuffer = ""
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cont = 0
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def fullimage(self, img, max_height=860, width=512, histeq=True, bandsize=255):
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""" Resizes and prints an arbitrarily sized image """
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if isinstance(img, Image.Image):
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im = img.convert("RGB")
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else:
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im = Image.open(img).convert("RGB")
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def _convert_image(self, im):
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""" Parse image and prepare it to a printable format
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if histeq:
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# Histogram equaliztion
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h = im.histogram()
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lut = []
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for b in range(0, len(h), 256):
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# step size
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step = reduce(operator.add, h[b:b+256]) // 255
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# create equalization lookup table
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n = 0
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for i in range(256):
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lut.append(n // step)
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n = n + h[i+b]
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im = im.point(lut)
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:param im: image data
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:raises: ImageSizeError
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"""
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pixels = []
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if width:
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ratio = float(width) / im.size[0]
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newheight = int(ratio * im.size[1])
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# Resize the image
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im = im.resize((width, newheight), Image.ANTIALIAS)
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if max_height and im.size[1] > max_height:
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im = im.crop((0, 0, im.size[0], max_height))
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# Divide into bands
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current = 0
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while current < im.size[1]:
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self.image(im.crop((0, current, width or im.size[0],
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min(im.size[1], current + bandsize))))
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current += bandsize
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def image(self, im):
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""" Parse image and prepare it to a printable format """
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pixels = []
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pix_line = ""
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im_left = ""
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im_right = ""
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switch = 0
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img_size = [0, 0]
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switch = 0
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img_size = [ 0, 0 ]
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if im.size[0] > 512:
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print ("WARNING: Image is wider than 512 and could be truncated at print time ")
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if im.size[1] > 0xffff:
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if not isinstance(im, Image.Image):
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im = Image.open(im)
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im = im.convert("L")
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im = ImageOps.invert(im)
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im = im.convert("1")
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if im.size[0] > 640:
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print("WARNING: Image is wider than 640 and could be truncated at print time ")
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if im.size[1] > 640:
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raise ImageSizeError()
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im_border = self._check_image_size(im.size[0])
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for i in range(im_border[0]):
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im_left += "0"
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for i in range(im_border[1]):
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im_right += "0"
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orig_width, height = im.size
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width = ((orig_width + 31) // 32) * 32
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new_image = Image.new("1", (width, height))
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new_image.paste(im, (0, 0, orig_width, height))
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for y in range(im.size[1]):
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img_size[1] += 1
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pix_line += im_left
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img_size[0] += im_border[0]
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for x in range(im.size[0]):
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img_size[0] += 1
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RGB = im.getpixel((x, y))
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im_color = (RGB[0] + RGB[1] + RGB[2])
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im_pattern = "1X0"
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pattern_len = len(im_pattern)
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switch = (switch - 1) * (-1)
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for x in range(pattern_len):
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if im_color <= (255 * 3 / pattern_len * (x+1)):
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if im_pattern[x] == "X":
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pix_line += "%d" % switch
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else:
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pix_line += im_pattern[x]
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break
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elif (255 * 3 / pattern_len * pattern_len) < im_color <= (255 * 3):
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pix_line += im_pattern[-1]
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break
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pix_line += im_right
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img_size[0] += im_border[1]
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self._print_image(pix_line, img_size)
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<<<<<<< HEAD
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def image(self, path_img):
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""" Open image file
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:param path_img: path to image
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"""
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im_open = Image.open(path_img)
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# Remove the alpha channel on transparent images
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if im_open.mode == 'RGBA':
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im_open.load()
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im = Image.new("RGB", im_open.size, (255, 255, 255))
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im.paste(im_open, mask=im_open.split()[3])
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else:
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im = im_open.convert("RGB")
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# Convert the RGB image in printable image
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self._convert_image(im)
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the_bytes = new_image.tobytes()
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self._print_image(the_bytes, n_rows=height, col_bytes=width//8)
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def direct_image(self, image):
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""" Send image to printer"""
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@ -186,19 +171,26 @@ class Escpos(object):
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self._raw(binascii.unhexlify(bytes(buf, "ascii")))
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self._raw('\n')
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def qr(self, text, error_correct=qrcode.constants.ERROR_CORRECT_M):
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def qr(self, text, error_correction=qrcode.constants.ERROR_CORRECT_M):
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""" Print QR Code for the provided string
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:param text: text to generate a QR-Code from
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"""
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qr_code = qrcode.QRCode(version=4, box_size=4, border=1, error_correction=qrcode.constants.ERROR_CORRECT_H)
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qr_code = qrcode.QRCode(version=4, box_size=4, border=1, error_correction=error_correction)
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qr_code.add_data(text)
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qr_code.make(fit=True)
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qr_img = qr_code.make_image()
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im = qr_img._img.convert("RGB")
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# Convert the RGB image in printable image
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self._convert_image(im)
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im = qr_img._img.convert("1")
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width = im.size[0]
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height = im.size[1]
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while width * 2 <= 640:
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width *= 2
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height *= 2
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im = im.resize((width, height))
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self.image(im)
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self.text('\n')
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def charcode(self, code):
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""" Set Character Code Table
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@ -177,10 +177,7 @@ class File(Escpos):
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def _raw(self, msg):
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""" Print any command sent in raw format """
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if type(msg) is str:
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self.device.write(msg.encode());
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else:
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self.device.write(msg);
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self.device.write(msg);
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def __del__(self):
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""" Close system file """
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@ -0,0 +1,9 @@
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try:
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bytes.fromhex
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def hex2bytes(hex_string):
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return bytes.fromhex(hex_string)
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except:
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def hex2bytes(hex_string):
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return hex_string.decode('hex')
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