Faidon Liambotisandclydebarrow
a043022444
Co-authored-by: clydebarrow <2366188+clydebarrow@users.noreply.github.com>
633 lines
19 KiB
Python
633 lines
19 KiB
Python
from collections.abc import Iterable
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import functools
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import hashlib
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import logging
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import os
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from pathlib import Path
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import re
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import freetype
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import glyphsets
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from packaging import version
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import requests
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from esphome import core, external_files
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import esphome.codegen as cg
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import esphome.config_validation as cv
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from esphome.const import (
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CONF_FAMILY,
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CONF_FILE,
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CONF_GLYPHS,
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CONF_ID,
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CONF_PATH,
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CONF_RAW_DATA_ID,
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CONF_REFRESH,
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CONF_SIZE,
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CONF_TYPE,
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CONF_URL,
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CONF_WEIGHT,
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)
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from esphome.core import CORE, HexInt
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from esphome.helpers import copy_file_if_changed, cpp_string_escape
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_LOGGER = logging.getLogger(__name__)
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DOMAIN = "font"
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MULTI_CONF = True
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CODEOWNERS = ["@esphome/core", "@clydebarrow"]
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font_ns = cg.esphome_ns.namespace("font")
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Font = font_ns.class_("Font")
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Glyph = font_ns.class_("Glyph")
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GlyphData = font_ns.struct("GlyphData")
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CONF_BPP = "bpp"
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CONF_EXTRAS = "extras"
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CONF_FONTS = "fonts"
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CONF_GLYPHSETS = "glyphsets"
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CONF_IGNORE_MISSING_GLYPHS = "ignore_missing_glyphs"
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# Cache loaded freetype fonts
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class FontCache(dict):
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def __missing__(self, key):
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res = self[key] = freetype.Face(key)
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return res
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FONT_CACHE = FontCache()
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def glyph_comparator(x, y):
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x_ = x.encode("utf-8")
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y_ = y.encode("utf-8")
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for c in range(min(len(x_), len(y_))):
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if x_[c] < y_[c]:
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return -1
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if x_[c] > y_[c]:
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return 1
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if len(x_) < len(y_):
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return -1
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if len(x_) > len(y_):
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return 1
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return 0
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def flatten(lists) -> list:
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"""
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Given a list of lists, flatten it to a single list of all elements of all lists.
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This wraps itertools.chain.from_iterable to make it more readable, and return a list
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rather than a single use iterable.
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"""
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from itertools import chain
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return list(chain.from_iterable(lists))
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def check_missing_glyphs(file, codepoints: Iterable, warning: bool = False):
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"""
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Check that the given font file actually contains the requested glyphs
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:param file: A Truetype font file
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:param codepoints: A list of codepoints to check
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:param warning: If true, log a warning instead of raising an exception
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"""
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font = FONT_CACHE[file]
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missing = [chr(x) for x in codepoints if font.get_char_index(x) == 0]
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if missing:
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# Only list up to 10 missing glyphs
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missing.sort(key=functools.cmp_to_key(glyph_comparator))
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count = len(missing)
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missing = missing[:10]
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missing_str = "\n ".join(
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f"{x} ({x.encode('unicode_escape')})" for x in missing
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)
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if count > 10:
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missing_str += f"\n and {count - 10} more."
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message = f"Font {Path(file).name} is missing {count} glyph{'s' if count != 1 else ''}:\n {missing_str}"
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if warning:
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_LOGGER.warning(message)
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else:
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raise cv.Invalid(message)
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def validate_glyphs(config):
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"""
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Check for duplicate codepoints, then check that all requested codepoints actually
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have glyphs defined in the appropriate font file.
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"""
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# Collect all glyph codepoints and flatten to a list of chars
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glyphspoints = flatten(
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[x[CONF_GLYPHS] for x in config[CONF_EXTRAS]] + config[CONF_GLYPHS]
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)
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# Convert a list of strings to a list of chars (one char strings)
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glyphspoints = flatten([list(x) for x in glyphspoints])
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if len(set(glyphspoints)) != len(glyphspoints):
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duplicates = {x for x in glyphspoints if glyphspoints.count(x) > 1}
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dup_str = ", ".join(f"{x} ({x.encode('unicode_escape')})" for x in duplicates)
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raise cv.Invalid(
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f"Found duplicate glyph{'s' if len(duplicates) != 1 else ''}: {dup_str}"
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)
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# convert to codepoints
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glyphspoints = {ord(x) for x in glyphspoints}
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fileconf = config[CONF_FILE]
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setpoints = set(
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flatten([glyphsets.unicodes_per_glyphset(x) for x in config[CONF_GLYPHSETS]])
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)
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# Make setpoints and glyphspoints disjoint
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setpoints.difference_update(glyphspoints)
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if fileconf[CONF_TYPE] == TYPE_LOCAL_BITMAP:
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# Pillow only allows 256 glyphs per bitmap font. Not sure if that is a Pillow limitation
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# or a file format limitation
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if any(x >= 256 for x in setpoints.copy().union(glyphspoints)):
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raise cv.Invalid("Codepoints in bitmap fonts must be in the range 0-255")
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else:
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# for TT fonts, check that glyphs are actually present
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# Check extras against their own font, exclude from parent font codepoints
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for extra in config[CONF_EXTRAS]:
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points = {ord(x) for x in flatten(extra[CONF_GLYPHS])}
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glyphspoints.difference_update(points)
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setpoints.difference_update(points)
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check_missing_glyphs(extra[CONF_FILE][CONF_PATH], points)
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# A named glyph that can't be provided is an error
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check_missing_glyphs(fileconf[CONF_PATH], glyphspoints)
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# A missing glyph from a set is a warning.
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if not config[CONF_IGNORE_MISSING_GLYPHS]:
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check_missing_glyphs(fileconf[CONF_PATH], setpoints, warning=True)
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# Populate the default after the above checks so that use of the default doesn't trigger errors
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if not config[CONF_GLYPHS] and not config[CONF_GLYPHSETS]:
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if fileconf[CONF_TYPE] == TYPE_LOCAL_BITMAP:
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config[CONF_GLYPHS] = [DEFAULT_GLYPHS]
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else:
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# set a default glyphset, intersected with what the font actually offers
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font = FONT_CACHE[fileconf[CONF_PATH]]
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config[CONF_GLYPHS] = [
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chr(x)
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for x in glyphsets.unicodes_per_glyphset(DEFAULT_GLYPHSET)
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if font.get_char_index(x) != 0
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]
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return config
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def validate_pillow_installed(value):
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try:
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import PIL
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except ImportError as err:
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raise cv.Invalid(
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"Please install the pillow python package to use this feature. "
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'(pip install "pillow==10.4.0")'
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) from err
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if version.parse(PIL.__version__) != version.parse("10.4.0"):
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raise cv.Invalid(
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"Please update your pillow installation to 10.4.0. "
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'(pip install "pillow==10.4.0")'
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)
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return value
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FONT_EXTENSIONS = (".ttf", ".woff", ".otf")
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def validate_truetype_file(value):
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if value.lower().endswith(".zip"): # for Google Fonts downloads
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raise cv.Invalid(
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f"Please unzip the font archive '{value}' first and then use the .ttf files inside."
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)
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if not any(map(value.lower().endswith, FONT_EXTENSIONS)):
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raise cv.Invalid(f"Only {FONT_EXTENSIONS} files are supported.")
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return CORE.relative_config_path(cv.file_(value))
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TYPE_LOCAL = "local"
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TYPE_LOCAL_BITMAP = "local_bitmap"
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TYPE_GFONTS = "gfonts"
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TYPE_WEB = "web"
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LOCAL_SCHEMA = cv.Schema(
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{
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cv.Required(CONF_PATH): validate_truetype_file,
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}
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)
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LOCAL_BITMAP_SCHEMA = cv.Schema(
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{
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cv.Required(CONF_PATH): cv.file_,
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}
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)
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FULLPATH_SCHEMA = cv.maybe_simple_value(
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{cv.Required(CONF_PATH): cv.string}, key=CONF_PATH
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)
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CONF_ITALIC = "italic"
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FONT_WEIGHTS = {
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"thin": 100,
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"extra-light": 200,
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"light": 300,
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"regular": 400,
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"medium": 500,
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"semi-bold": 600,
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"bold": 700,
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"extra-bold": 800,
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"black": 900,
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}
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def validate_weight_name(value):
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return FONT_WEIGHTS[cv.one_of(*FONT_WEIGHTS, lower=True, space="-")(value)]
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def _compute_local_font_path(value: dict) -> Path:
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url = value[CONF_URL]
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h = hashlib.new("sha256")
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h.update(url.encode())
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key = h.hexdigest()[:8]
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base_dir = external_files.compute_local_file_dir(DOMAIN)
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_LOGGER.debug("_compute_local_font_path: base_dir=%s", base_dir / key)
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return base_dir / key
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def get_font_path(value, font_type) -> Path:
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if font_type == TYPE_GFONTS:
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name = f"{value[CONF_FAMILY]}@{value[CONF_WEIGHT]}@{value[CONF_ITALIC]}@v1"
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return external_files.compute_local_file_dir(DOMAIN) / f"{name}.ttf"
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if font_type == TYPE_WEB:
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return _compute_local_font_path(value) / "font.ttf"
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assert False
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def download_gfont(value):
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name = (
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f"{value[CONF_FAMILY]}:ital,wght@{int(value[CONF_ITALIC])},{value[CONF_WEIGHT]}"
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)
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url = f"https://fonts.googleapis.com/css2?family={name}"
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path = get_font_path(value, TYPE_GFONTS)
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_LOGGER.debug("download_gfont: path=%s", path)
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try:
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req = requests.get(url, timeout=external_files.NETWORK_TIMEOUT)
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req.raise_for_status()
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except requests.exceptions.RequestException as e:
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raise cv.Invalid(
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f"Could not download font at {url}, please check the fonts exists "
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f"at google fonts ({e})"
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)
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match = re.search(r"src:\s+url\((.+)\)\s+format\('truetype'\);", req.text)
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if match is None:
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raise cv.Invalid(
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f"Could not extract ttf file from gfonts response for {name}, "
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f"please report this."
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)
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ttf_url = match.group(1)
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_LOGGER.debug("download_gfont: ttf_url=%s", ttf_url)
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external_files.download_content(ttf_url, path)
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return FULLPATH_SCHEMA(path)
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def download_web_font(value):
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url = value[CONF_URL]
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path = get_font_path(value, TYPE_WEB)
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external_files.download_content(url, path)
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_LOGGER.debug("download_web_font: path=%s", path)
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return FULLPATH_SCHEMA(path)
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EXTERNAL_FONT_SCHEMA = cv.Schema(
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{
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cv.Optional(CONF_WEIGHT, default="regular"): cv.Any(
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cv.int_, validate_weight_name
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),
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cv.Optional(CONF_ITALIC, default=False): cv.boolean,
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cv.Optional(CONF_REFRESH, default="1d"): cv.All(cv.string, cv.source_refresh),
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}
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)
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GFONTS_SCHEMA = cv.All(
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EXTERNAL_FONT_SCHEMA.extend(
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{
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cv.Required(CONF_FAMILY): cv.string_strict,
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}
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),
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download_gfont,
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)
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WEB_FONT_SCHEMA = cv.All(
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EXTERNAL_FONT_SCHEMA.extend(
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{
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cv.Required(CONF_URL): cv.string_strict,
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}
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),
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download_web_font,
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)
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def validate_file_shorthand(value):
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value = cv.string_strict(value)
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if value.startswith("gfonts://"):
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match = re.match(r"^gfonts://([^@]+)(@.+)?$", value)
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if match is None:
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raise cv.Invalid("Could not parse gfonts shorthand syntax, please check it")
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family = match.group(1)
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weight = match.group(2)
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data = {
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CONF_TYPE: TYPE_GFONTS,
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CONF_FAMILY: family,
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}
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if weight is not None:
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data[CONF_WEIGHT] = weight[1:]
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return font_file_schema(data)
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if value.startswith("http://") or value.startswith("https://"):
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return font_file_schema(
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{
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CONF_TYPE: TYPE_WEB,
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CONF_URL: value,
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}
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)
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if value.endswith(".pcf") or value.endswith(".bdf"):
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value = convert_bitmap_to_pillow_font(
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CORE.relative_config_path(cv.file_(value))
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)
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return {
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CONF_TYPE: TYPE_LOCAL_BITMAP,
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CONF_PATH: value,
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}
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return font_file_schema(
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{
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CONF_TYPE: TYPE_LOCAL,
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CONF_PATH: value,
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}
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)
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TYPED_FILE_SCHEMA = cv.typed_schema(
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{
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TYPE_LOCAL: LOCAL_SCHEMA,
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TYPE_GFONTS: GFONTS_SCHEMA,
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TYPE_LOCAL_BITMAP: LOCAL_BITMAP_SCHEMA,
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TYPE_WEB: WEB_FONT_SCHEMA,
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}
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)
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def font_file_schema(value):
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if isinstance(value, str):
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return validate_file_shorthand(value)
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return TYPED_FILE_SCHEMA(value)
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# Default if no glyphs or glyphsets are provided
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DEFAULT_GLYPHSET = "GF_Latin_Kernel"
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# default for bitmap fonts
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DEFAULT_GLYPHS = ' !"%()+=,-.:/?0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz<C2><B0>'
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CONF_RAW_GLYPH_ID = "raw_glyph_id"
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FONT_SCHEMA = cv.Schema(
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{
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cv.Required(CONF_ID): cv.declare_id(Font),
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cv.Required(CONF_FILE): font_file_schema,
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cv.Optional(CONF_GLYPHS, default=[]): cv.ensure_list(cv.string_strict),
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cv.Optional(CONF_GLYPHSETS, default=[]): cv.ensure_list(
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cv.one_of(*glyphsets.defined_glyphsets())
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),
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cv.Optional(CONF_IGNORE_MISSING_GLYPHS, default=False): cv.boolean,
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cv.Optional(CONF_SIZE, default=20): cv.int_range(min=1),
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cv.Optional(CONF_BPP, default=1): cv.one_of(1, 2, 4, 8),
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cv.Optional(CONF_EXTRAS, default=[]): cv.ensure_list(
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cv.Schema(
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{
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cv.Required(CONF_FILE): font_file_schema,
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cv.Required(CONF_GLYPHS): cv.ensure_list(cv.string_strict),
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}
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)
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),
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cv.GenerateID(CONF_RAW_DATA_ID): cv.declare_id(cg.uint8),
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cv.GenerateID(CONF_RAW_GLYPH_ID): cv.declare_id(GlyphData),
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},
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)
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CONFIG_SCHEMA = cv.All(validate_pillow_installed, FONT_SCHEMA, validate_glyphs)
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# PIL doesn't provide a consistent interface for both TrueType and bitmap
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# fonts. So, we use our own wrappers to give us the consistency that we need.
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class TrueTypeFontWrapper:
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def __init__(self, font):
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self.font = font
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def getoffset(self, glyph):
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_, (offset_x, offset_y) = self.font.font.getsize(glyph)
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return offset_x, offset_y
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def getmask(self, glyph, **kwargs):
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return self.font.getmask(str(glyph), **kwargs)
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def getmetrics(self, glyphs):
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return self.font.getmetrics()
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class BitmapFontWrapper:
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def __init__(self, font):
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self.font = font
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self.max_height = 0
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def getoffset(self, glyph):
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return 0, 0
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def getmask(self, glyph, **kwargs):
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return self.font.getmask(str(glyph), **kwargs)
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def getmetrics(self, glyphs):
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max_height = 0
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for glyph in glyphs:
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mask = self.getmask(glyph, mode="1")
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_, height = mask.size
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max_height = max(max_height, height)
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return max_height, 0
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class EFont:
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def __init__(self, file, size, codepoints):
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self.codepoints = codepoints
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path = file[CONF_PATH]
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self.name = Path(path).name
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ftype = file[CONF_TYPE]
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if ftype == TYPE_LOCAL_BITMAP:
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self.font = load_bitmap_font(path)
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else:
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self.font = load_ttf_font(path, size)
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self.ascent, self.descent = self.font.getmetrics(codepoints)
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def convert_bitmap_to_pillow_font(filepath):
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from PIL import BdfFontFile, PcfFontFile
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local_bitmap_font_file = external_files.compute_local_file_dir(
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DOMAIN,
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) / os.path.basename(filepath)
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copy_file_if_changed(filepath, local_bitmap_font_file)
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local_pil_font_file = local_bitmap_font_file.with_suffix(".pil")
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with open(local_bitmap_font_file, "rb") as fp:
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try:
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try:
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p = PcfFontFile.PcfFontFile(fp)
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except SyntaxError:
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fp.seek(0)
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p = BdfFontFile.BdfFontFile(fp)
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# Convert to pillow-formatted fonts, which have a .pil and .pbm extension.
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p.save(local_pil_font_file)
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except (SyntaxError, OSError) as err:
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raise core.EsphomeError(
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f"Failed to parse as bitmap font: '{filepath}': {err}"
|
|
)
|
|
|
|
return str(local_pil_font_file)
|
|
|
|
|
|
def load_bitmap_font(filepath):
|
|
from PIL import ImageFont
|
|
|
|
try:
|
|
font = ImageFont.load(str(filepath))
|
|
except Exception as e:
|
|
raise core.EsphomeError(f"Failed to load bitmap font file: {filepath}: {e}")
|
|
|
|
return BitmapFontWrapper(font)
|
|
|
|
|
|
def load_ttf_font(path, size):
|
|
from PIL import ImageFont
|
|
|
|
try:
|
|
font = ImageFont.truetype(str(path), size)
|
|
except Exception as e:
|
|
raise core.EsphomeError(f"Could not load TrueType file {path}: {e}")
|
|
|
|
return TrueTypeFontWrapper(font)
|
|
|
|
|
|
class GlyphInfo:
|
|
def __init__(self, data_len, offset_x, offset_y, width, height):
|
|
self.data_len = data_len
|
|
self.offset_x = offset_x
|
|
self.offset_y = offset_y
|
|
self.width = width
|
|
self.height = height
|
|
|
|
|
|
async def to_code(config):
|
|
"""
|
|
Collect all glyph codepoints, construct a map from a codepoint to a font file.
|
|
Codepoints are either explicit (glyphs key in top level or extras) or part of a glyphset.
|
|
Codepoints listed in extras use the extra font and override codepoints from glyphsets.
|
|
Achieve this by processing the base codepoints first, then the extras
|
|
"""
|
|
|
|
# get the codepoints from glyphsets and flatten to a set of chrs.
|
|
point_set: set[str] = {
|
|
chr(x)
|
|
for x in flatten(
|
|
[glyphsets.unicodes_per_glyphset(x) for x in config[CONF_GLYPHSETS]]
|
|
)
|
|
}
|
|
# get the codepoints from the glyphs key, flatten to a list of chrs and combine with the points from glyphsets
|
|
point_set.update(flatten(config[CONF_GLYPHS]))
|
|
size = config[CONF_SIZE]
|
|
# Create the codepoint to font file map
|
|
base_font = EFont(config[CONF_FILE], size, point_set)
|
|
point_font_map: dict[str, EFont] = {c: base_font for c in point_set}
|
|
# process extras, updating the map and extending the codepoint list
|
|
for extra in config[CONF_EXTRAS]:
|
|
extra_points = flatten(extra[CONF_GLYPHS])
|
|
point_set.update(extra_points)
|
|
extra_font = EFont(extra[CONF_FILE], size, extra_points)
|
|
point_font_map.update({c: extra_font for c in extra_points})
|
|
|
|
codepoints = list(point_set)
|
|
codepoints.sort(key=functools.cmp_to_key(glyph_comparator))
|
|
glyph_args = {}
|
|
data = []
|
|
bpp = config[CONF_BPP]
|
|
if bpp == 1:
|
|
mode = "1"
|
|
scale = 1
|
|
else:
|
|
mode = "L"
|
|
scale = 256 // (1 << bpp)
|
|
# create the data array for all glyphs
|
|
for codepoint in codepoints:
|
|
font = point_font_map[codepoint]
|
|
mask = font.font.getmask(codepoint, mode=mode)
|
|
offset_x, offset_y = font.font.getoffset(codepoint)
|
|
width, height = mask.size
|
|
glyph_data = [0] * ((height * width * bpp + 7) // 8)
|
|
pos = 0
|
|
for y in range(height):
|
|
for x in range(width):
|
|
pixel = mask.getpixel((x, y)) // scale
|
|
for bit_num in range(bpp):
|
|
if pixel & (1 << (bpp - bit_num - 1)):
|
|
glyph_data[pos // 8] |= 0x80 >> (pos % 8)
|
|
pos += 1
|
|
glyph_args[codepoint] = GlyphInfo(len(data), offset_x, offset_y, width, height)
|
|
data += glyph_data
|
|
|
|
rhs = [HexInt(x) for x in data]
|
|
prog_arr = cg.progmem_array(config[CONF_RAW_DATA_ID], rhs)
|
|
|
|
# Create the glyph table that points to data in the above array.
|
|
glyph_initializer = []
|
|
for codepoint in codepoints:
|
|
glyph_initializer.append(
|
|
cg.StructInitializer(
|
|
GlyphData,
|
|
(
|
|
"a_char",
|
|
cg.RawExpression(
|
|
f"(const uint8_t *){cpp_string_escape(codepoint)}"
|
|
),
|
|
),
|
|
(
|
|
"data",
|
|
cg.RawExpression(
|
|
f"{str(prog_arr)} + {str(glyph_args[codepoint].data_len)}"
|
|
),
|
|
),
|
|
("offset_x", glyph_args[codepoint].offset_x),
|
|
("offset_y", glyph_args[codepoint].offset_y),
|
|
("width", glyph_args[codepoint].width),
|
|
("height", glyph_args[codepoint].height),
|
|
)
|
|
)
|
|
|
|
glyphs = cg.static_const_array(config[CONF_RAW_GLYPH_ID], glyph_initializer)
|
|
|
|
cg.new_Pvariable(
|
|
config[CONF_ID],
|
|
glyphs,
|
|
len(glyph_initializer),
|
|
base_font.ascent,
|
|
base_font.ascent + base_font.descent,
|
|
bpp,
|
|
)
|