image-filter/index.html at main · tony-xlh/image-filter · GitHub

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<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <script src="/dynamsoft-document-viewer@1.1.0/dist/ddv.js"></script>
    <link rel="stylesheet" href="/dynamsoft-document-viewer@1.1.0/dist/ddv.css">
    <title>Image Filter</title>
    <style>
      .imageContainer {
        overflow: auto;
      }

      #image {
        max-width: 50%;
      }

      #imageHidden {
        display: none;
      }

      #canvasHidden {
        display: none;
      }

      #container {
        display: none;
        width: 100%;
        height: 450px;
    }
    </style>
    <script type="module" src="/src/main.ts"></script>
  </head>
  <body>
    <div class="home">
      <h2>Image Filter</h2>
      <button id="loadFileButton">Load a File</button>
      <input style="display:none;" type="file" id="file" onchange="loadImageFromFile();" accept=".jpg,.jpeg,.png,.bmp" />
      <label>
        Effect:
        <select id="effectSelect">
          <option>Sepia</option>
          <option>Grayscale</option>
          <option>Invert</option>
          <option>Black & White (50% Threshold)</option>
          <option>Black & White (OTSU)</option>
          <option>Black & White (Adaptive)</option>
          <option>Gaussian Blur</option>
        </select>
      </label>
      <button id="convertButton">Convert</button>
      <button id="downloadButton">Download</button>
      <button id="toggleButton">Toggle Dynamsoft Document Viewer</button>
      <div class="imageContainer">
        <img id="image"/>
        <img id="imageHidden"/>
      </div>
      <canvas id="canvasHidden"></canvas>
      <div id="container"></div>
    </div>

    <script>
      let cvs = document.getElementById("canvasHidden");
      let grayscaleFilter;
      let sepiaFilter;
      let blackwhiteFilter;
      let invertFilter;
      let editViewer;
      let gaussianBlurFilter;

      window.onload = function (){
        grayscaleFilter = new GrayscaleFilter(cvs);
        sepiaFilter = new SepiaFilter(cvs);
        blackwhiteFilter = new BlackwhiteFilter(cvs);
        invertFilter = new InvertFilter(cvs);
        gaussianBlurFilter = new GaussianBlurFilter(cvs,3);
        initDDV();
      }

      async function initDDV(){
        Dynamsoft.DDV.Core.license = "DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9"; // Public trial license which is valid for 24 hours
        Dynamsoft.DDV.Core.engineResourcePath = "/dynamsoft-document-viewer@1.1.0/dist/engine";// Lead to a folder containing the distributed WASM files
        await Dynamsoft.DDV.Core.loadWasm();
        await Dynamsoft.DDV.Core.init();
        let filterHandler = new ImageFilterHandler();
        // Configure image filter feature
        Dynamsoft.DDV.setProcessingHandler("imageFilter", filterHandler);
        // Create an edit viewer
        editViewer = new Dynamsoft.DDV.EditViewer({
          container: "container",
        });
      }

      document.getElementById("loadFileButton").addEventListener("click",function(){
        document.getElementById("file").click();
      })

      document.getElementById("toggleButton").addEventListener("click",function(){
        if (!editViewer) {
          alert("Dynamsoft Document Viewer is still loading.");
          return;
        }
        let container = document.getElementById("container");
        if (container.style.display === "none" || container.style.display === "") {
          container.style.display = "block";
        }else{
          container.style.display = "none";
        }
      })

      document.getElementById("convertButton").addEventListener("click",function(){
        const img = document.getElementById("imageHidden");
        let effectIndex = document.getElementById("effectSelect").selectedIndex;
        if (effectIndex === 0) {
          sepiaFilter.process(img);
        }else if (effectIndex === 1){
          grayscaleFilter.process(img);
        }else if (effectIndex === 2){
          invertFilter.process(img);
        }else if (effectIndex === 3){
          blackwhiteFilter.setThreshold(127);
          blackwhiteFilter.setOTSUEnabled(false);
          let threshold = blackwhiteFilter.process(img);
          console.log("Threshold: "+threshold);
        }else if (effectIndex === 4){
          blackwhiteFilter.setOTSUEnabled(true);
          let threshold = blackwhiteFilter.process(img);
          console.log("Threshold: "+threshold);
        }else if (effectIndex === 5){
          blackwhiteFilter.setAdaptive(true,31,10);
          blackwhiteFilter.process(img);
        }else if (effectIndex === 6){
          gaussianBlurFilter.process(img);
        }
        document.getElementById("image").src = cvs.toDataURL();
      })

      document.getElementById("downloadButton").addEventListener("click",async function(){
        const src = document.getElementById("image").src;
        if (!src) {
          return;
        }
        const link = document.createElement('a');
        const response = await fetch(src);
        const blob = await response.blob();
        link.href = URL.createObjectURL(blob);
        link.target = "_blank";
        link.download = 'grayscale.png';
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      })


      function loadImageFromFile(){
        let fileInput = document.getElementById("file");
        let files = fileInput.files;
        if (files.length == 0) {
          return;
        }
        document.getElementById("image").style.filter = "";
        let file = files[0];
        fileReader = new FileReader();
        fileReader.onload = function(e){
          document.getElementById("image").src = e.target.result;
          document.getElementById("imageHidden").src = e.target.result;
        };
        fileReader.onerror = function () {
          console.warn('oops, something went wrong.');
        };
        fileReader.readAsDataURL(file);
      }
    </script>
  </body>
</html>