wbk/pdf2tspl
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

remove dependency on PIL

Browse source
This commit is contained in:
James Wah 2021-07-02 20:50:43 +10:00
parent d52ef4b755
commit 6d7075f433
1 changed files with 25 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
tspl.py
View file

@ -2,17 +2,30 @@
import tempfile import tempfile
import subprocess import subprocess
from PIL import Image import dataclasses
@dataclasses.dataclass
class Image:
width: int
height: int
data: bytes
def convert_pdf(pdfname, args=[]): def convert_pdf(pdfname, args=[]):
pbmfile = tempfile.NamedTemporaryFile(suffix='.pbm') with tempfile.NamedTemporaryFile(suffix='.pbm') as pbmfile:
subprocess.check_call(["pdftoppm", "-mono", "-singlefile"] + args + [pdfname, pbmfile.name.removesuffix('.pbm')]) subprocess.check_call(["pdftoppm", "-mono", "-singlefile"] + args + [pdfname, pbmfile.name.removesuffix('.pbm')])
return Image.open(pbmfile) header = pbmfile.readline()
if header.strip() != b'P4':
raise ValueError("unrecognised image format")
width_height = pbmfile.readline().decode('ascii')
data = bytes(x ^ 0xff for x in pbmfile.read())
width, height = map(int, width_height.strip().split())
return Image(width, height, data)
def convert_pdf_scaled(pdfname, max_width, max_height): def convert_pdf_scaled(pdfname, max_width, max_height):
im = convert_pdf(pdfname) im = convert_pdf(pdfname)
aspect = im.size[0] / im.size[1] aspect = im.width / im.height
max_aspect = max_width / max_height max_aspect = max_width / max_height
if aspect < max_aspect: if aspect < max_aspect:
@ -25,8 +38,8 @@ def convert_pdf_scaled(pdfname, max_width, max_height):
args = ['-scale-to-x', str(max_width), '-scale-to-y', str(max_height)] args = ['-scale-to-x', str(max_width), '-scale-to-y', str(max_height)]
im = convert_pdf(pdfname, args) im = convert_pdf(pdfname, args)
assert im.size[0] <= max_width + 1 assert im.width <= max_width + 1
assert im.size[1] <= max_height assert im.height <= max_height
return im return im
@ -36,12 +49,12 @@ def pdf2tspl(filename, labelwidth_mm=100, labelheight_mm=150, dpi=203):
image = convert_pdf_scaled(filename, labelwidth, labelheight) image = convert_pdf_scaled(filename, labelwidth, labelheight)
paste_x = (labelwidth - image.size[0]) // 2 paste_x = (labelwidth - image.width) // 2
paste_y = (labelheight - image.size[1]) // 2 paste_y = (labelheight - image.height) // 2
row_bytes = (image.size[0] + 7) // 8 row_bytes = (image.width + 7) // 8
command = b"\r\n\r\nSIZE %d mm\r\nCLS\r\nBITMAP %d,%d,%d,%d,0," % (labelwidth_mm, paste_x, paste_y, row_bytes, image.size[1]) command = b"\r\n\r\nSIZE %d mm\r\nCLS\r\nBITMAP %d,%d,%d,%d,0," % (labelwidth_mm, paste_x, paste_y, row_bytes, image.height)
command += image.tobytes() command += image.data
command += b"\r\nPRINT 1,1\r\n" command += b"\r\nPRINT 1,1\r\n"
return command return command