Webleb - Snippet di Codice - Editor di immagini a mezzitoni

<!DOCTYPE html>
<html lang="pl">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Edytor Obrazu z Filtrem Half-Tone</title>
  <style>
    body {
      background: oklch(from #fe0 .9 .064 h);
      font-family: sans-serif;
      padding: 1rem;
    }
    img {
      max-width: 100%;
      height: auto;
      margin-top: 1rem;
      filter: none;
    }
    button {
      margin-top: 1rem;
      padding: 0.5rem 1rem;
      font-size: 1rem;
      cursor: pointer;
      background-color: #166496;
      color: white;
      border: none;
      border-radius: 4px;
    }
    button:hover {
      background-color: #124d77;
    }
  </style>
</head>
<body>
  <input type="file" accept="image/*" id="upload">
  <select id="filter-select">
    <option value="">None</option>
    <option selected value="half-tone">Half-Tone</option>
    <option value="half-tone-hd">Half-Tone HD</option>
  </select>
  <input type="color" value="#166496" name="color" id="color">
  <br>
  <img src="https://i.imgur.com/CMox3HF.jpeg" id="preview" crossorigin="anonymous">
  <label for="format-select">Format:</label>
  <select id="format-select">
    <option value="png" selected>PNG</option>
    <option value="jpeg">JPEG</option>
    <option value="webp">WebP</option>
  </select>
  <button id="download">Pobierz edytowany obraz</button>

<feColorMatrix in="SourceGraphic" type="luminanceToAlpha" result="lum" />
        <feComponentTransfer in="lum" result="lum-map">
          <feFuncA type="table" tableValues="1 0" />
        </feComponentTransfer>

<feComponentTransfer in="lum-map" result="thresh1">
          <feFuncA type="discrete" tableValues="1 0 0 0 0 0 0 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh2">
          <feFuncA type="discrete" tableValues="0 1 0 0 0 0 0 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh3">
          <feFuncA type="discrete" tableValues="0 0 1 0 0 0 0 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh4">
          <feFuncA type="discrete" tableValues="0 0 0 1 0 0 0 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh5">
          <feFuncA type="discrete" tableValues="0 0 0 0 1 0 0 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh6">
          <feFuncA type="discrete" tableValues="0 0 0 0 0 1 0 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh7">
          <feFuncA type="discrete" tableValues="0 0 0 0 0 0 1 0" />
        </feComponentTransfer>
        <feComponentTransfer in="lum-map" result="thresh8">
          <feFuncA type="discrete" tableValues="0 0 0 0 0 0 0 1" />
        </feComponentTransfer>

<feComposite in="thresh1" in2="dot1-tile" operator="in" result="level1" />
        <feComposite in="thresh2" in2="dot2-tile" operator="in" result="level2" />
        <feComposite in="thresh3" in2="dot3-tile" operator="in" result="level3" />
        <feComposite in="thresh4" in2="dot4-tile" operator="in" result="level4" />
        <feComposite in="thresh5" in2="dot5-tile" operator="in" result="level5" />
        <feComposite in="thresh6" in2="dot6-tile" operator="in" result="level6" />
        <feComposite in="thresh7" in2="dot7-tile" operator="in" result="level7" />
        <feComposite in="thresh8" in2="dot8-tile" operator="in" result="level8" />

<feMerge result="merged">
          <feMergeNode in="level8" />
          <feMergeNode in="level7" />
          <feMergeNode in="level6" />
          <feMergeNode in="level5" />
          <feMergeNode in="level4" />
          <feMergeNode in="level3" />
          <feMergeNode in="level2" />
          <feMergeNode in="level1" />
        </feMerge>

<feComposite in="merged" in2="SourceGraphic" operator="in" result="masked" />

<feFlood id="flood" flood-color="#166496" result="color" />
        <feComposite in="color" in2="masked" operator="in" />
      </filter>
    </defs>
  </svg>

<feComposite in="merged" in2="SourceGraphic" operator="in" result="masked" />

<feFlood id="floodHd" flood-color="#166496" result="color" />
        <feComposite in="color" in2="masked" operator="in" />
      </filter>
    </defs>
  </svg>

// Obsługa przesyłania obrazu
    upload.addEventListener("input", e => {
      const file = e.target.files[0];
      if (!file) return;
      preview.src = URL.createObjectURL(file);
    });

// Obsługa zmiany koloru
    color.addEventListener("input", e => {
      const val = color.value;
      flood.setAttribute("flood-color", val);
      floodHd.setAttribute("flood-color", val);
    });

// Obsługa wyboru filtra
    filterSelect.addEventListener("change", setFilter);

function setFilter() {
      const val = filterSelect.value;
      preview.style.filter = val ? `url(#${val})` : "none";
    }

// Ustaw początkowy filtr
    setFilter();

// Funkcja do renderowania SVG i konwersji do canvas
    async function renderToCanvas(imageSrc, filter, width, height) {
      return new Promise((resolve, reject) => {
        const svgNS = "http://www.w3.org/2000/svg";
        const svg = document.createElementNS(svgNS, "svg");
        svg.setAttribute("width", width);
        svg.setAttribute("height", height);

const image = document.createElementNS(svgNS, "image");
        image.setAttribute("width", width);
        image.setAttribute("height", height);
        image.setAttribute("x", "0");
        image.setAttribute("y", "0");
        image.setAttributeNS("http://www.w3.org/1999/xlink", "href", imageSrc);
        if (filter) {
          image.setAttribute("filter", `url(#${filter})`);
        }

svg.appendChild(image);

// Serializuj SVG do ciągu
        const svgString = new XMLSerializer().serializeToString(svg);
        const svgBlob = new Blob([svgString], { type: "image/svg+xml" });
        const svgUrl = URL.createObjectURL(svgBlob);

// Utwórz obraz z SVG
        const img = new Image();
        img.crossOrigin = "anonymous";
        img.onload = () => {
          // Utwórz canvas
          const canvas = document.createElement("canvas");
          canvas.width = width;
          canvas.height = height;
          const ctx = canvas.getContext("2d");
          ctx.drawImage(img, 0, 0, width, height);
          URL.revokeObjectURL(svgUrl);
          resolve(canvas);
        };
        img.onerror = reject;
        img.src = svgUrl;
      });
    }

// Obsługa pobierania obrazu
    downloadBtn.addEventListener("click", async () => {
      // Upewnij się, że obraz jest załadowany
      if (!preview.complete || preview.naturalWidth === 0) {
        alert("Proszę załadować obraz przed pobraniem!");
        return;
      }

// Pobierz wybrany format
      const selectedFormat = formatSelect.value;
      const formatMap = {
        png: { mime: "image/png", ext: "png" },
        jpeg: { mime: "image/jpeg", ext: "jpg" },
        webp: { mime: "image/webp", ext: "webp" }
      };
      const { mime, ext } = formatMap[selectedFormat];

// Pobierz filtr
      const filter = filterSelect.value;

// Renderuj obraz do canvas
      const canvas = await renderToCanvas(
        preview.src,
        filter,
        preview.naturalWidth,
        preview.naturalHeight
      );

// Określ jakość dla JPEG i WebP
      const quality = selectedFormat === "png" ? undefined : 0.8;
      const dataURL = quality ? canvas.toDataURL(mime, quality) : canvas.toDataURL(mime);

// Utwórz tymczasowy link do pobierania
      const link = document.createElement("a");
      link.href = dataURL;
      link.download = `edytowany-obraz.${ext}`;

// Dodaj link do dokumentu, kliknij i usuń
      document.body.appendChild(link);
      link.click();
      document.body.removeChild(link);
    });
  </script>
</body>
</html>

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