思い出をePaper に映そう！

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import sys
import os
import argparse
import subprocess
import io
from PIL import Image, ImageOps, ImageEnhance
import tempfile

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
sys.path.append(os.path.join(BASE_DIR, 'e-Paper', 'RaspberryPi_JetsonNano', 'python', 'lib'))

from waveshare_epd import epd7in3e

PALETTE_COLORS = [
    0, 0, 0,        # 黒
    255, 255, 255,  # 白
    255, 0, 0,      # 赤
    255, 255, 0,    # 黄
    0, 0, 180,      # 青
    0, 255, 0,      # 緑
] + [0] * (768 - 18)

def load_image_in_memory(image_path):
    ext = os.path.splitext(image_path)[1].lower()

    if ext in ['.heic', '.heif']:
        ram_dir = "/dev/shm" if os.path.exists("/dev/shm") else None

        with tempfile.NamedTemporaryFile(suffix=".jpg", dir=ram_dir, delete=True) as tmp_file:
            cmd = ["heif-convert", image_path, tmp_file.name]
            subprocess.run(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.PIPE, check=True)

            img = Image.open(tmp_file.name).convert("RGB")
            img.load() 
            return img
    else:
        return Image.open(image_path).convert("RGB")


def convert_in_memory(image_path, target_size=(800, 480)):
    img = load_image_in_memory(image_path)

    img = ImageOps.exif_transpose(img)

    img = img.resize(target_size, Image.Resampling.LANCZOS)

    img = ImageEnhance.Brightness(img).enhance(1.2)
    img = ImageEnhance.Contrast(img).enhance(1.15)
    img = ImageEnhance.Color(img).enhance(1.3)

    palette_img = Image.new("P", (1, 1))
    palette_img.putpalette(PALETTE_COLORS)

    dithered_img = img.quantize(palette=palette_img, dither=Image.Dither.FLOYDSTEINBERG)

    return dithered_img.convert("RGB")


def main():
    parser = argparse.ArgumentParser(
        description="7.3inch カラー電子ペーパー (HAT E) にHEIC/JPEG/PNG写真を直接描画するCLIツール"
    )
    parser.add_argument(
        "image_path",
        type=str,
        help="表示したい写真のパス (例: images/sample.HEIC)"
    )

    args = parser.parse_args()
    image_path = os.path.abspath(args.image_path)

    if not os.path.exists(image_path):
        print(f"エラー: 指定されたファイルが見つかりません -> {image_path}", file=sys.stderr)
        sys.exit(1)

    try:
        print(f"画像をメモリ上で処理中: {image_path}")
        frame_image = convert_in_memory(image_path)

        epd = epd7in3e.EPD()
        epd.init()
        epd.Clear()

        print("電子ペーパーへ描画中...")
        epd.display(epd.getbuffer(frame_image))

        epd.sleep()

    except subprocess.CalledProcessError as e:
        print(f"HEIC変換エラー: heif-convert の実行に失敗しました。\n{e.stderr.decode()}", file=sys.stderr)
        sys.exit(1)
    except Exception as e:
        print(f"エラーが発生しました: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()

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#! /bin/bash

cd /home/pi/ePaper

get_image() {
        images=(images/*)
        count=${#images[@]}

        if [ "$count" -eq 0 ]; then
                echo "there are no images"
                exit 1
        fi

        rand_index=$(( RANDOM % count ))

        selected_image="${images[$rand_index]}"
        echo "$selected_image"
}

/usr/bin/python3 main.py $(get_image)

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0 3,15 * * * /home/pi/ePaper/main.sh

@reboot sleep 60 && /home/pi/ePaper/main.sh

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0 3,15 * * * /home/pi/ePaper/main.sh >> /home/pi/ePaper/cron.log

@reboot sleep 60 && /home/pi/ePaper/main.sh >> /home/pi/ePaper/cron.log