Source code for boxes.formats

#!/usr/bin/env python3
# Copyright (C) 2013-2014 Florian Festi
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.


import subprocess
import tempfile
import os
import cairo
import re
from boxes import svgutil

[docs]class PSFile: def __init__(self, filename): self.filename = filename
[docs] def adjustDocumentMedia(self): with open(self.filename, "r+") as f: s = f.read(1024) m = re.search(r"%%BoundingBox: (\d+) (\d+) (\d+) (\d+)", s) if not m: raise ValueError("%%BoundingBox in Postscript file not found") x1, y1, x2, y2 = m.groups() m = re.search(r"%%DocumentMedia: \d+x\d+mm ((\d+) (\d+)) 0 \(", s) f.seek(m.start(1)) media = "%i %i" % (int(x1) + int(x2), int(y1) + int(y2)) f.write(media + " " * (len(m.group(1)) - len(media)))
[docs]class Formats: pstoedit = "/usr/bin/pstoedit" _BASE_FORMATS = ['svg', 'svg_Ponoko', 'ps'] formats = { "svg": None, "svg_Ponoko": None, "ps": None, "dxf": "-flat 0.1 -f dxf:-mm".split(), "gcode": "-f gcode".split(), "plt": "-f plot-hpgl".split(), "ai": "-f ps2ai".split(), "pdf": "-f pdf".split(), } http_headers = { "svg": [('Content-type', 'image/svg+xml; charset=utf-8')], "svg_Ponoko": [('Content-type', 'image/svg+xml; charset=utf-8')], "ps": [('Content-type', 'application/postscript')], "dxf": [('Content-type', 'image/vnd.dxf')], "plt": [('Content-type', ' application/vnd.hp-hpgl')], "gcode": [('Content-type', 'text/plain; charset=utf-8')], # "" : [('Content-type', '')], } def __init__(self): pass
[docs] def getFormats(self): if os.path.isfile(self.pstoedit): return sorted(self.formats.keys()) else: return self._BASE_FORMATS
[docs] def getSurface(self, fmt, filename): width = height = 10000 # mm if fmt in ("svg", "svg_Ponoko"): surface = cairo.SVGSurface(filename, width, height) mm2pt = 1.0 else: mm2pt = 72 / 25.4 width *= mm2pt height *= mm2pt # 3.543307 surface = cairo.PSSurface(filename, width, height) ctx = cairo.Context(surface) ctx.translate(0, height) ctx.scale(mm2pt, -mm2pt) return surface, ctx
[docs] def convert(self, filename, fmt, metadata=None): if fmt in ['svg', 'svg_Ponoko']: svg = svgutil.SVGFile(filename) svg.fix(metadata) else: ps = PSFile(filename) ps.adjustDocumentMedia() if fmt not in self._BASE_FORMATS: fd, tmpfile = tempfile.mkstemp(dir=os.path.dirname(filename)) cmd = [self.pstoedit] + self.formats[fmt] + [filename, tmpfile] err = subprocess.call(cmd) if err: # XXX show stderr output try: os.unlink(tmpfile) except: pass raise ValueError("Conversion failed. pstoedit returned %i" % err) os.rename(tmpfile, filename)