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chrissimpkinschrissimpkins
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add instanceworker module
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‎src/slice/instanceworker.py

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# This file is part of Slice.
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#
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# Slice is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Slice is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Slice. If not, see <https://www.gnu.org/licenses/>.
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import datetime
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import sys
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import traceback
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from fontTools.misc.textTools import num2binary
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from fontTools.ttLib.ttFont import TTFont
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from fontTools.varLib.mutator import instantiateVariableFont
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from PyQt5.QtCore import QObject, QRunnable, pyqtSignal, pyqtSlot
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class InstanceWorkerSignals(QObject):
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finished = pyqtSignal() # no return type, only signal that complete
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error = pyqtSignal(str) # returns the error message
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result = pyqtSignal(str) # returns file path for the new file write
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class InstanceWorker(QRunnable):
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def __init__(
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self,
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outpath=None,
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font_model=None,
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axis_model=None,
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name_model=None,
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bit_model=None,
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):
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super().__init__()
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self.signals = InstanceWorkerSignals()
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self.outpath = outpath
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self.font_model = font_model
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self.axis_model = axis_model
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self.name_model = name_model
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self.bit_model = bit_model
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self.ttfont = None
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@pyqtSlot()
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def run(self):
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try:
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# Debugging in stdout
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print(f"\n\n{datetime.datetime.now()}")
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self.ttfont = TTFont(self.font_model.fontpath)
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# instantiate
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self.instantiate_variable_font()
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# edit name table records
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self.edit_name_table()
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# edit bit flags
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self.edit_bit_flags()
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# write to disk
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self.ttfont.save(self.outpath)
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except Exception as e:
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self.signals.error.emit(f"{e}")
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sys.stderr.write(f"{traceback.format_exc()}\n")
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else:
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# returns the file out file path on success
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self.signals.result.emit(self.outpath)
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self.signals.finished.emit()
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def instantiate_variable_font(self):
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axis_instance_data = self.axis_model.get_instance_data()
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instantiateVariableFont(self.ttfont, axis_instance_data, inplace=True)
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print("\nAXIS INSTANCE VALUES")
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print(
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f"Instantiated variable font with axis definitions:\n{axis_instance_data}"
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)
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def edit_name_table(self):
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# string, nameID, platformID, platEncID, langID
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name_record_plat_enc_lang = (3, 1, 1033)
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name_instance_data = self.name_model.get_instance_data()
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name_table = self.ttfont["name"]
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# set 3, 1, 1033 name records (only!)
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# mandatory writes
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name_table.setName(name_instance_data["nameID1"], 1, *name_record_plat_enc_lang)
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name_table.setName(name_instance_data["nameID2"], 2, *name_record_plat_enc_lang)
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name_table.setName(name_instance_data["nameID3"], 3, *name_record_plat_enc_lang)
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name_table.setName(name_instance_data["nameID4"], 4, *name_record_plat_enc_lang)
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name_table.setName(name_instance_data["nameID6"], 6, *name_record_plat_enc_lang)
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# optional writes
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# Approach:
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# (1) if user text data exists, write it
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# (2) if user text data does not exist but record does, delete it
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# (3) otherwise do nothing
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if name_instance_data["nameID16"] != "":
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name_table.setName(
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name_instance_data["nameID16"], 16, *name_record_plat_enc_lang
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)
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elif name_table.getName(16, *name_record_plat_enc_lang):
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name_table.removeNames(16, *name_record_plat_enc_lang)
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if name_instance_data["nameID17"] != "":
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name_table.setName(
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name_instance_data["nameID17"], 17, *name_record_plat_enc_lang
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)
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elif name_table.getName(17, *name_record_plat_enc_lang):
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name_table.removeNames(17, *name_record_plat_enc_lang)
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if name_instance_data["nameID21"] != "":
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name_table.setName(
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name_instance_data["nameID21"], 21, *name_record_plat_enc_lang
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)
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elif name_table.getName(21, *name_record_plat_enc_lang):
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name_table.removeNames(21, *name_record_plat_enc_lang)
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if name_instance_data["nameID22"] != "":
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name_table.setName(
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name_instance_data["nameID22"], 22, *name_record_plat_enc_lang
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)
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elif name_table.getName(22, *name_record_plat_enc_lang):
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name_table.removeNames(22, *name_record_plat_enc_lang)
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# update name table data
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self.ttfont["name"] = name_table
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# print name table report
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print("\nNAME TABLE EDITS")
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print("Name records at write time:\n")
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print(f"nameID1: {self.ttfont['name'].getName(1, *name_record_plat_enc_lang)}")
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print(f"nameID2: {self.ttfont['name'].getName(2, *name_record_plat_enc_lang)}")
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print(f"nameID3: {self.ttfont['name'].getName(3, *name_record_plat_enc_lang)}")
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print(f"nameID4: {self.ttfont['name'].getName(4, *name_record_plat_enc_lang)}")
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print(f"nameID6: {self.ttfont['name'].getName(6, *name_record_plat_enc_lang)}")
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print(
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f"nameID16: {self.ttfont['name'].getName(16, *name_record_plat_enc_lang)}"
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)
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print(
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f"nameID17: {self.ttfont['name'].getName(17, *name_record_plat_enc_lang)}"
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)
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print(
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f"nameID21: {self.ttfont['name'].getName(21, *name_record_plat_enc_lang)}"
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)
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print(
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f"nameID22: {self.ttfont['name'].getName(22, *name_record_plat_enc_lang)}"
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)
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def edit_bit_flags(self):
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# edit the OS/2.fsSelection bit flag
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pre_os2_fsselection_int = self.ttfont["OS/2"].fsSelection
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edited_os2_fsselection_int = self.bit_model.edit_os2_fsselection_bits(
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pre_os2_fsselection_int
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)
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# edit OS/2.fsSelection in the TTFont attribute
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self.ttfont["OS/2"].fsSelection = edited_os2_fsselection_int
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# edit head.macstyle bit flag
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pre_head_macstyle_int = self.ttfont["head"].macStyle
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edited_head_macstyle_int = self.bit_model.edit_head_macstyle_bits(
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pre_head_macstyle_int
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)
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self.ttfont["head"].macStyle = edited_head_macstyle_int
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# bit flag debugging stdout report
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print("\nBIT FLAGS")
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print(
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f"\nOS/2.fsSelection updated with the following data:\n"
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f"{self.bit_model.get_os2_instance_data()}"
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)
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print(f"Pre OS/2.fsSelection: {num2binary(pre_os2_fsselection_int, bits=16)}")
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print(
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f"Post OS/2.fsSelection: {num2binary(self.ttfont['OS/2'].fsSelection, bits=16)}"
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)
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print(
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f"\nhead.macStyle bit flag updated with the following data:\n"
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f"{self.bit_model.get_head_instance_data()}"
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)
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print(f"Pre head.macStyle: {num2binary(pre_head_macstyle_int, bits=16)}")
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print(
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f"Post head.macStyle: {num2binary(self.ttfont['head'].macStyle, bits=16)}"
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)

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