mirror of https://github.com/esphome/esphome.git
128 lines
3.7 KiB
Python
128 lines
3.7 KiB
Python
import functools
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from esphome import core
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from esphome.components import display
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import esphome.config_validation as cv
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import esphome.codegen as cg
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from esphome.const import CONF_FILE, CONF_GLYPHS, CONF_ID, CONF_SIZE
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from esphome.core import CORE, HexInt
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DEPENDENCIES = ["display"]
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MULTI_CONF = True
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Font = display.display_ns.class_("Font")
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Glyph = display.display_ns.class_("Glyph")
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def validate_glyphs(value):
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if isinstance(value, list):
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value = cv.Schema([cv.string])(value)
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value = cv.Schema([cv.string])(list(value))
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def 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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raise cv.Invalid(f"Found duplicate glyph {x}")
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value.sort(key=functools.cmp_to_key(comparator))
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return value
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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)"
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) from err
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if PIL.__version__[0] < "4":
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raise cv.Invalid(
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"Please update your pillow installation to at least 4.0.x. "
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"(pip install -U pillow)"
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)
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return value
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def validate_truetype_file(value):
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if value.endswith(".zip"): # for Google Fonts downloads
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raise cv.Invalid(
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"Please unzip the font archive '{}' first and then use the .ttf files "
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"inside.".format(value)
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)
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if not value.endswith(".ttf"):
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raise cv.Invalid(
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"Only truetype (.ttf) files are supported. Please make sure you're "
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"using the correct format or rename the extension to .ttf"
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)
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return cv.file_(value)
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DEFAULT_GLYPHS = (
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' !"%()+,-.:0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz°'
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)
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CONF_RAW_DATA_ID = "raw_data_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): validate_truetype_file,
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cv.Optional(CONF_GLYPHS, default=DEFAULT_GLYPHS): validate_glyphs,
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cv.Optional(CONF_SIZE, default=20): cv.int_range(min=1),
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cv.GenerateID(CONF_RAW_DATA_ID): cv.declare_id(cg.uint8),
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}
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)
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CONFIG_SCHEMA = cv.All(validate_pillow_installed, FONT_SCHEMA)
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def to_code(config):
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from PIL import ImageFont
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path = CORE.relative_config_path(config[CONF_FILE])
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try:
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font = ImageFont.truetype(path, config[CONF_SIZE])
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except Exception as e:
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raise core.EsphomeError(f"Could not load truetype file {path}: {e}")
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ascent, descent = font.getmetrics()
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glyph_args = {}
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data = []
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for glyph in config[CONF_GLYPHS]:
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mask = font.getmask(glyph, mode="1")
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_, (offset_x, offset_y) = font.font.getsize(glyph)
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width, height = mask.size
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width8 = ((width + 7) // 8) * 8
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glyph_data = [0 for _ in range(height * width8 // 8)] # noqa: F812
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for y in range(height):
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for x in range(width):
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if not mask.getpixel((x, y)):
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continue
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pos = x + y * width8
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glyph_data[pos // 8] |= 0x80 >> (pos % 8)
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glyph_args[glyph] = (len(data), offset_x, offset_y, width, height)
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data += glyph_data
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rhs = [HexInt(x) for x in data]
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prog_arr = cg.progmem_array(config[CONF_RAW_DATA_ID], rhs)
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glyphs = []
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for glyph in config[CONF_GLYPHS]:
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glyphs.append(Glyph(glyph, prog_arr, *glyph_args[glyph]))
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cg.new_Pvariable(config[CONF_ID], glyphs, ascent, ascent + descent)
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