muos-app/RomM/imageutils.py at e72d546089f51266a89989ebb836a74c88d5b1a4 · rommapp/muos-app · GitHub

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import os
from io import BytesIO
from typing import Optional
from urllib.error import HTTPError, URLError
from urllib.request import Request, urlopen
from urllib.parse import urljoin

from PIL import Image, ImageDraw


class ImageUtils:
    _instance: Optional["ImageUtils"] = None
    _initialized: bool = False

    screen_width = 640
    screen_height = 480

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super(ImageUtils, cls).__new__(cls)
        return cls._instance

    def __init__(self) -> None:
        if self._initialized:
            return

        self.host = os.getenv("HOST", "").strip("/")
        self.fade_mask = self.generate_fade_mask()
        self._initialized = True

    def generate_fade_mask(self) -> Image.Image:
        fade_mask = Image.new("L", (self.screen_width, self.screen_height), 0)
        draw = ImageDraw.Draw(fade_mask)
        x_crit = self.screen_width / 3.0

        for x in range(self.screen_width):
            if x < x_crit:
                t = x / x_crit
                alpha = int((t**2) * (255 / 3))  # a x = x_crit, alpha = 255/3 ≈ 85
            else:
                t = (x - x_crit) / (self.screen_width - x_crit)
                alpha = int(85 + t * (255 - 85))
            draw.line([(x, 0), (x, self.screen_height)], fill=alpha)

        return fade_mask

    def add_rounded_corners(self, image: Image.Image, radius: int = 20):
        rounded_mask = Image.new("L", image.size, 0)
        draw = ImageDraw.Draw(rounded_mask)
        draw.rounded_rectangle(
            (0, 0, image.size[0], image.size[1]), radius=radius, fill=255
        )
        image.putalpha(rounded_mask)
        return image

    def load_image_from_url(self, url: str, headers: dict) -> Image.Image | None:
        try:
            # Use urljoin to properly resolve relative URLs against the host
            if url:
                url = urljoin(f'{self.host}/', url)

            req = Request(url.split("?")[0], headers=headers)
            with urlopen(req, timeout=60) as response:  # trunk-ignore(bandit/B310)
                data = response.read()
            return Image.open(BytesIO(data)).convert("RGBA")
        except (URLError, HTTPError, IOError) as e:
            print(f"Error loading image from URL {url}: {e}")
            return None

    def process_assets(
        self,
        fullscreen: bool,
        cover_url: str | None,
        screenshot_urls: list[str],
        box_path: str,
        preview_path: str,
        headers: dict,
    ) -> None:
        if not cover_url and not screenshot_urls:
            return

        final_width, final_height = self.screen_width, self.screen_height
        background = None
        preview = (
            self.load_image_from_url(screenshot_urls[0], headers)
            if len(screenshot_urls) > 0
            else None
        )

        if preview:
            preview = preview.resize((final_width, final_height))
            preview.save(preview_path)

        if fullscreen:
            if preview:
                background = preview
            else:
                background = Image.new(
                    "RGBA", (final_width, final_height), (0, 0, 0, 0)
                )
            background.putalpha(self.fade_mask)

        foreground = self.load_image_from_url(cover_url, headers) if cover_url else None

        if foreground:
            max_cover_width = 215
            max_cover_height = int(final_height * 3 / 5)
            scale_w = max_cover_width / foreground.width
            scale_h = max_cover_height / foreground.height
            scale = min(scale_w, scale_h)
            new_cover_width = int(foreground.width * scale)
            new_cover_height = int(foreground.height * scale)
            foreground = foreground.resize((new_cover_width, new_cover_height))
            foreground = self.add_rounded_corners(foreground)

            fg_x = final_width - new_cover_width - 20
            fg_y = (final_height - new_cover_height) // 2

            if background:
                background.paste(foreground, (fg_x, fg_y), foreground)
            else:
                background = foreground

        if background:
            background.save(box_path)