esphome/esphome/components/image/__init__.py

# coding=utf-8
import logging

from esphome import core
from esphome.components import display, font
import esphome.config_validation as cv
import esphome.codegen as cg
from esphome.const import CONF_FILE, CONF_ID, CONF_RESIZE
from esphome.core import CORE, HexInt
_LOGGER = logging.getLogger(__name__)

DEPENDENCIES = ['display']
MULTI_CONF = True

Image_ = display.display_ns.class_('Image')

CONF_RAW_DATA_ID = 'raw_data_id'

IMAGE_SCHEMA = cv.Schema({
    cv.Required(CONF_ID): cv.declare_variable_id(Image_),
    cv.Required(CONF_FILE): cv.file_,
    cv.Optional(CONF_RESIZE): cv.dimensions,
    cv.GenerateID(CONF_RAW_DATA_ID): cv.declare_variable_id(cg.uint8),
})

CONFIG_SCHEMA = cv.All(font.validate_pillow_installed, IMAGE_SCHEMA)


def to_code(config):
    from PIL import Image

    path = CORE.relative_path(config[CONF_FILE])
    try:
        image = Image.open(path)
    except Exception as e:
        raise core.EsphomeError(u"Could not load image file {}: {}".format(path, e))

    if CONF_RESIZE in config:
        image.thumbnail(config[CONF_RESIZE])

    image = image.convert('1', dither=Image.NONE)
    width, height = image.size
    if width > 500 or height > 500:
        _LOGGER.warning("The image you requested is very big. Please consider using the resize "
                        "parameter")
    width8 = ((width + 7) // 8) * 8
    data = [0 for _ in range(height * width8 // 8)]
    for y in range(height):
        for x in range(width):
            if image.getpixel((x, y)):
                continue
            pos = x + y * width8
            data[pos // 8] |= 0x80 >> (pos % 8)

    rhs = [HexInt(x) for x in data]
    prog_arr = cg.progmem_array(config[CONF_RAW_DATA_ID], rhs)
    cg.new_Pvariable(config[CONF_ID], prog_arr, width, height)