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bitmap_generator.py
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bitmap_generator.py
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from collections import namedtuple
from PIL import Image, ImageFont, ImageDraw, ImageOps
from PhomemoM02Pro_constants import DOT_PER_LINE
BitmapData = namedtuple("BitmapData", ["bitmap", "width", "height"])
def text_to_bitmap(text: str, fontsize: int) -> BitmapData:
font = ImageFont.load_default(size=fontsize)
image_width = DOT_PER_LINE
image_height = int(fontsize * 1.5)
# create image
img = Image.new('1', (image_width, image_height), 0)
draw = ImageDraw.Draw(img)
# draw text
draw.text((0, 0), text, font=font, fill=1)
return BitmapData(img.tobytes(), image_width, image_height)
def img_to_bitmap(img_path: str) -> BitmapData:
img = Image.open(img_path)
# image width is fixed to 576dots
# calculate image height to keep aspect ratio
image_width = DOT_PER_LINE
image_height = int(image_width / img.width * img.height)
# resize & dithering
img = img.resize((image_width, image_height))
img = img.convert('1', dither=Image.FLOYDSTEINBERG)
# invert image, because printer prints 1 as black
img = ImageOps.invert(img)
return BitmapData(img.tobytes(), image_width, image_height)