Allow printing images

Author: hkeward

Makefile

@@ -0,0 +1,21 @@
+install:
+	python3 setup.py install 
+
+build: clean
+	python3 -m build
+	twine check dist/*
+
+clean:
+	rm -rf build dist phomemo_printer.egginfo
+
+bump-version:
+	current_version=$(cat phomemo_printer/version.py | cut -f ' ' -d 2 | tr -d \")
+	major=$(echo "${current_version}" | cut  -d '.' -f 1)
+	minor=$(echo "${current_version}" | cut  -d '.' -f 2)
+	patch=$(echo "${current_version}" | cut  -d '.' -f 3)
+	new_patch=$((${patcH} + 1))
+	new_version="${major}.${minor}.${new_patch}"
+	sed -i "s/${current_version}/${new_version}/"
+
+release:  build
+	python3 -m twine upload dist/*

phomemo_printer/ESCPOS_printer.py

@@ -2,6 +2,7 @@
 from .pixel_sans.charset import charset
 from .ESCPOS_constants import *
 import socket
+from PIL import Image
 
 
 class Printer:
@@ -137,3 +138,70 @@ def print_charset(self):
             ]
         )
         self.print_text(char_string_split)
+
+    # from https://github.com/vivier/phomemo-tools
+    def print_image(self, image_path):
+        """
+            Print an image
+
+            Args:
+                image_path (str): Path to an image file to print
+        """
+        image = Image.open(image_path)
+        if image.width > image.height:
+            image = image.transpose(Image.ROTATE_90)
+
+        # width 384 dots
+        IMAGE_WIDTH_BYTES = 70
+        IMAGE_WIDTH_BITS = IMAGE_WIDTH_BYTES * 8
+        image = image.resize(
+            size=(IMAGE_WIDTH_BITS, int(image.height * IMAGE_WIDTH_BITS / image.width))
+        )
+
+        # black&white printer: dithering
+        image = image.convert(mode="1")
+
+        self._print_bytes(HEADER)
+        for start_index in range(0, image.height, 256):
+            end_index = (
+                start_index + 256 if image.height - 256 > start_index else image.height
+            )
+            line_height = end_index - start_index
+
+            BLOCK_MARKER = (
+                GSV0
+                + bytes([IMAGE_WIDTH_BYTES])
+                + b"\x00"
+                + bytes([line_height - 1])
+                + b"\x00"
+            )
+            self._print_bytes(BLOCK_MARKER)
+
+            image_lines = []
+            for image_line_index in range(line_height):
+                image_line = b""
+                for byte_start in range(int(image.width / 8)):
+                    byte = 0
+                    for bit in range(8):
+                        if (
+                            image.getpixel(
+                                (byte_start * 8 + bit, image_line_index + start_index)
+                            )
+                            == 0
+                        ):
+                            byte |= 1 << (7 - bit)
+                    # 0x0a breaks the rendering
+                    # 0x0a alone is processed like LineFeed by the printe
+                    if byte == 0x0A:
+                        byte = 0x14
+                    # self._print_bytes(byte.to_bytes(1, 'little'))
+                    image_line += byte.to_bytes(1, "little")
+
+                image_lines.append(image_line)
+
+            for l in image_lines:
+                self._print_bytes(l)
+
+        self._print_bytes(PRINT_FEED)
+        self._print_bytes(PRINT_FEED)
+        self._print_bytes(FOOTER)

phomemo_printer/command_line.py

@@ -8,9 +8,10 @@ def main(args):
 
     if args.print_charset:
         printer.print_charset()
-    else:
-        text = args.text
-        printer.print_text(text)
+    elif args.text:
+        printer.print_text(args.text)
+    elif args.image:
+        printer.print_image(args.image)
 
     printer.close()
 
@@ -32,6 +33,9 @@ def cli():
         action="store_true",
         default=False,
     )
+    group.add_argument(
+        "-i", "--image", type=str, help="Image file to print", required=False
+    )
     parser.add_argument(
         "-a",
         "--bluetooth_address",

phomemo_printer/version.py

@@ -1 +1 @@
-__version__ = "1.0.3"
+__version__ = "1.0.4"

requirements.txt

@@ -1 +1,2 @@
 argparse
+Pillow