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path: root/layout/tools/reftest/reftest-analyzer-structured.xhtml
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<?xml version="1.0" encoding="UTF-8"?>
<!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
<!--

Features to add:
* make the left and right parts of the viewer independently scrollable
* make the test list filterable
** default to only showing unexpecteds
* add other ways to highlight differences other than circling?
* add zoom/pan to images
* Add ability to load log via XMLHttpRequest (also triggered via URL param)
* color the test list based on pass/fail and expected/unexpected/random/skip
* ability to load multiple logs ?
** rename them by clicking on the name and editing
** turn the test list into a collapsing tree view
** move log loading into popup from viewer UI

-->
<!DOCTYPE html>
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>Reftest analyzer</title>
    <style type="text/css">
      <![CDATA[

        html, body { margin: 0; }
        html { padding: 0; }
        body { padding: 4px; }

        #pixelarea, #itemlist, #images { position: absolute; }
        #itemlist, #images { overflow: auto; }
        #pixelarea { top: 0; left: 0; width: 320px; height: 84px; overflow: visible }
        #itemlist { top: 84px; left: 0; width: 320px; bottom: 0; }
        #images { top: 0; bottom: 0; left: 320px; right: 0; }

        #leftpane { width: 320px; }
        #images { position: fixed; top: 10px; left: 340px; }

        form#imgcontrols { margin: 0; display: block; }

        #itemlist > table { border-collapse: collapse; }
        #itemlist > table > tbody > tr > td { border: 1px solid; padding: 1px; }
        #itemlist td.activeitem { background-color: yellow; }

        /*
        #itemlist > table > tbody > tr.pass > td.url { background: lime; }
        #itemlist > table > tbody > tr.fail > td.url { background: red; }
        */

        #magnification > svg { display: block; width: 84px; height: 84px; }

        #pixelinfo { font: small sans-serif; position: absolute; width: 200px; left: 84px; }
        #pixelinfo table { border-collapse: collapse; }
        #pixelinfo table th { white-space: nowrap; text-align: left; padding: 0; }
        #pixelinfo table td { font-family: monospace; padding: 0 0 0 0.25em; }

        #pixelhint { display: inline; color: #88f; cursor: help; }
        #pixelhint > * { display: none; position: absolute; margin: 8px 0 0 8px; padding: 4px; width: 400px; background: #ffa; color: black; box-shadow: 3px 3px 2px #888; z-index: 1; }
        #pixelhint:hover { color: #000; }
        #pixelhint:hover > * { display: block; }
        #pixelhint p { margin: 0; }
        #pixelhint p + p { margin-top: 1em; }

        ]]>
    </style>
    <script type="text/javascript">
      <![CDATA[

      var XLINK_NS = "http://www.w3.org/1999/xlink";
      var SVG_NS = "http://www.w3.org/2000/svg";
      var IMAGE_NOT_AVAILABLE = "data:image/png;base64,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";

      var gPhases = null;

      var gIDCache = {};

      var gMagPixPaths = [];     // 2D array of array-of-two <path> objects used in the pixel magnifier
      var gMagWidth = 5;         // number of zoomed in pixels to show horizontally
      var gMagHeight = 5;        // number of zoomed in pixels to show vertically
      var gMagZoom = 16;         // size of the zoomed in pixels
      var gImage1Data;           // ImageData object for the reference image
      var gImage2Data;           // ImageData object for the test output image
      var gFlashingPixels = [];  // array of <path> objects that should be flashed due to pixel color mismatch
      var gParams;

      function ID(id) {
        if (!(id in gIDCache))
          gIDCache[id] = document.getElementById(id);
        return gIDCache[id];
      }

      function hash_parameters() {
        var result = { };
        var params = window.location.hash.substr(1).split(/[&;]/);
        for (var i = 0; i < params.length; i++) {
          var parts = params[i].split("=");
          result[parts[0]] = unescape(unescape(parts[1]));
        }
        return result;
      }

      function load() {
        gPhases = [ ID("entry"), ID("loading"), ID("viewer") ];
        build_mag();
        gParams = hash_parameters();
        if (gParams.log) {
          show_phase("loading");
          process_log(gParams.log);
        } else if (gParams.logurl) {
          show_phase("loading");
          var req = new XMLHttpRequest();
          req.onreadystatechange = function() {
            if (req.readyState === 4) {
              process_log(req.responseText);
            }
          };
          req.open('GET', gParams.logurl, true);
          req.send();
        }
        window.addEventListener('keypress', handle_keyboard_shortcut);
        ID("image1").addEventListener('error', image_load_error);
        ID("image2").addEventListener('error', image_load_error);
      }

      function image_load_error(e) {
        e.target.setAttributeNS(XLINK_NS, "xlink:href", IMAGE_NOT_AVAILABLE);
      }

      function build_mag() {
        var mag = ID("mag");

        var r = document.createElementNS(SVG_NS, "rect");
        r.setAttribute("x", gMagZoom * -gMagWidth / 2);
        r.setAttribute("y", gMagZoom * -gMagHeight / 2);
        r.setAttribute("width", gMagZoom * gMagWidth);
        r.setAttribute("height", gMagZoom * gMagHeight);
        mag.appendChild(r);

        mag.setAttribute("transform", "translate(" + (gMagZoom * (gMagWidth / 2) + 1) + "," + (gMagZoom * (gMagHeight / 2) + 1) + ")");

        for (var x = 0; x < gMagWidth; x++) {
          gMagPixPaths[x] = [];
          for (var y = 0; y < gMagHeight; y++) {
            var p1 = document.createElementNS(SVG_NS, "path");
            p1.setAttribute("d", "M" + ((x - gMagWidth / 2) + 1) * gMagZoom + "," + (y - gMagHeight / 2) * gMagZoom + "h" + -gMagZoom + "v" + gMagZoom);
            p1.setAttribute("stroke", "black");
            p1.setAttribute("stroke-width", "1px");
            p1.setAttribute("fill", "#aaa");

            var p2 = document.createElementNS(SVG_NS, "path");
            p2.setAttribute("d", "M" + ((x - gMagWidth / 2) + 1) * gMagZoom + "," + (y - gMagHeight / 2) * gMagZoom + "v" + gMagZoom + "h" + -gMagZoom);
            p2.setAttribute("stroke", "black");
            p2.setAttribute("stroke-width", "1px");
            p2.setAttribute("fill", "#888");

            mag.appendChild(p1);
            mag.appendChild(p2);
            gMagPixPaths[x][y] = [p1, p2];
          }
        }

        var flashedOn = false;
        setInterval(function() {
          flashedOn = !flashedOn;
          flash_pixels(flashedOn);
        }, 500);
      }

      function show_phase(phaseid) {
        for (var i in gPhases) {
          var phase = gPhases[i];
          phase.style.display = (phase.id == phaseid) ? "" : "none";
        }

        if (phase == "viewer")
          ID("images").style.display = "none";
      }

      function fileentry_changed() {
        show_phase("loading");
        var input = ID("fileentry");
        var files = input.files;
        if (files.length) {
          // Only handle the first file; don't handle multiple selection.
          // The parts of the log we care about are ASCII-only.  Since we
          // can ignore lines we don't care about, best to read in as
          // iso-8859-1, which guarantees we don't get decoding errors.
          var fileReader = new FileReader();
          fileReader.onload = function(e) {
            var log = null;

            log = e.target.result;

            if (log)
              process_log(log);
            else
              show_phase("entry");
          }
          fileReader.readAsText(files[0], "iso-8859-1");
        }
        // So the user can process the same filename again (after
        // overwriting the log), clear the value on the form input so we
        // will always get an onchange event.
        input.value = "";
      }

      function log_pasted() {
        show_phase("loading");
        var entry = ID("logentry");
        var log = entry.value;
        entry.value = "";
        process_log(log);
      }

      var gTestItems;

      function process_log(contents) {
        var lines = contents.split(/[\r\n]+/);
        gTestItems = [];
        for (var j in lines) {
          var line = lines[j];
          try {
            var data = JSON.parse(line);
          } catch(e) {
            continue;
          }
          // Ignore duplicated output in logcat.
          if (!data.action == "test_end" && data.status != "FAIL")
            continue;

          if (!data.hasOwnProperty("extra") ||
              !data.extra.hasOwnProperty("reftest_screenshots")) {
            continue;
          }

          var url = data.test;
          var screenshots = data.extra.reftest_screenshots;
          gTestItems.push(
            {
              pass: data.status === "PASS",
              // only one of the following three should ever be true
              unexpected: data.hasOwnProperty("expected"),
              random: false,
              skip: data.status == "SKIP",
              url,
              images: [],
              imageLabels: []
            });

          var item = gTestItems[gTestItems.length - 1];
          item.images.push("data:image/png;base64," + screenshots[0].screenshot);
          item.imageLabels.push(screenshots[0].url);
          if (screenshots.length > 1) {
            item.images.push("data:image/png;base64," + screenshots[2].screenshot);
            item.imageLabels.push(screenshots[2].url);
          }
        }
        build_viewer();
      }

      function build_viewer() {
        if (!gTestItems.length) {
          show_phase("entry");
          return;
        }

        var cell = ID("itemlist");
        while (cell.childNodes.length)
          cell.removeChild(cell.childNodes[cell.childNodes.length - 1]);

        var table = document.createElement("table");
        var tbody = document.createElement("tbody");
        table.appendChild(tbody);

        for (var i in gTestItems) {
          var item = gTestItems[i];

          // optional url filter for only showing unexpected results
          if (parseInt(gParams.only_show_unexpected) && !item.unexpected)
            continue;

          // XXX regardless skip expected pass items until we have filtering UI
          if (item.pass && !item.unexpected)
            continue;

          var tr = document.createElement("tr");
          var td;
          var text;

          td = document.createElement("td");
          text = "";
          if (item.unexpected) { text += "!"; }
          if (item.random) { text += "R"; }
          if (item.skip) { text += "S"; }
          td.appendChild(document.createTextNode(text));
          tr.appendChild(td);

          td = document.createElement("td");
          td.id = "item" + i;
          td.className = "url";
          // Only display part of URL after "/mozilla/".
          var match = item.url.match(/\/mozilla\/(.*)/);
          text = document.createTextNode(match ? match[1] : item.url);
          if (item.images.length) {
            var a = document.createElement("a");
            a.href = "javascript:show_images(" + i + ")";
            a.appendChild(text);
            td.appendChild(a);
          } else {
            td.appendChild(text);
          }
          tr.appendChild(td);

          tbody.appendChild(tr);
        }

        cell.appendChild(table);

        show_phase("viewer");
      }

      function get_image_data(src, whenReady) {
        var img = new Image();
        img.onload = function() {
          var canvas = document.createElement("canvas");
          canvas.width = img.naturalWidth;
          canvas.height = img.naturalHeight;

          var ctx = canvas.getContext("2d");
          ctx.drawImage(img, 0, 0);

          whenReady(ctx.getImageData(0, 0, img.naturalWidth, img.naturalHeight));
        };
        img.src = src;
      }

      function sync_svg_size(imageData) {
        // We need the size of the 'svg' and its 'image' elements to match the size
        // of the ImageData objects that we're going to read pixels from or else our
        // magnify() function will be very broken.
        ID("svg").setAttribute("width", imageData.width);
        ID("svg").setAttribute("height", imageData.height);
      }

      function show_images(i) {
        var item = gTestItems[i];
        var cell = ID("images");

        // Remove activeitem class from any existing elements
        var activeItems = document.querySelectorAll(".activeitem");
        for (var activeItemIdx = activeItems.length; activeItemIdx-- != 0;) {
          activeItems[activeItemIdx].classList.remove("activeitem");
        }

        ID("item" + i).classList.add("activeitem");
        ID("image1").style.display = "";
        ID("image2").style.display = "none";
        ID("diffrect").style.display = "none";
        ID("imgcontrols").reset();

        ID("image1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
        // Making the href be #image1 doesn't seem to work
        ID("feimage1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
        if (item.images.length == 1) {
          ID("imgcontrols").style.display = "none";
        } else {
          ID("imgcontrols").style.display = "";

          ID("image2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
          // Making the href be #image2 doesn't seem to work
          ID("feimage2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);

          ID("label1").textContent = 'Image ' + item.imageLabels[0];
          ID("label2").textContent = 'Image ' + item.imageLabels[1];
        }

        cell.style.display = "";

        get_image_data(item.images[0], function(data) { gImage1Data = data; sync_svg_size(gImage1Data); });
        get_image_data(item.images[1], function(data) { gImage2Data = data });
      }

      function show_image(i) {
        if (i == 1) {
          ID("image1").style.display = "";
          ID("image2").style.display = "none";
        } else {
          ID("image1").style.display = "none";
          ID("image2").style.display = "";
        }
      }

      function handle_keyboard_shortcut(event) {
        switch (event.charCode) {
        case 49: // "1" key
          document.getElementById("radio1").checked = true;
          show_image(1);
          break;
        case 50: // "2" key
          document.getElementById("radio2").checked = true;
          show_image(2);
          break;
        case 100: // "d" key
          document.getElementById("differences").click();
          break;
        case 112: // "p" key
          shift_images(-1);
          break;
        case 110: // "n" key
          shift_images(1);
          break;
        }
      }

      function shift_images(dir) {
        var activeItem = document.querySelector(".activeitem");
        if (!activeItem) {
          return;
        }
        for (var elm = activeItem; elm; elm = elm.parentElement) {
          if (elm.tagName != "tr") {
            continue;
          }
          elm = dir > 0 ? elm.nextElementSibling : elm.previousElementSibling;
          if (elm) {
            elm.getElementsByTagName("a")[0].click();
          }
          return;
        }
      }

      function show_differences(cb) {
        ID("diffrect").style.display = cb.checked ? "" : "none";
      }

      function flash_pixels(on) {
        var stroke = on ? "red" : "black";
        var strokeWidth = on ? "2px" : "1px";
        for (var i = 0; i < gFlashingPixels.length; i++) {
          gFlashingPixels[i].setAttribute("stroke", stroke);
          gFlashingPixels[i].setAttribute("stroke-width", strokeWidth);
        }
      }

      function cursor_point(evt) {
        var m = evt.target.getScreenCTM().inverse();
        var p = ID("svg").createSVGPoint();
        p.x = evt.clientX;
        p.y = evt.clientY;
        p = p.matrixTransform(m);
        return { x: Math.floor(p.x), y: Math.floor(p.y) };
      }

      function hex2(i) {
        return (i < 16 ? "0" : "") + i.toString(16);
      }

      function canvas_pixel_as_hex(data, x, y) {
        var offset = (y * data.width + x) * 4;
        var r = data.data[offset];
        var g = data.data[offset + 1];
        var b = data.data[offset + 2];
        return "#" + hex2(r) + hex2(g) + hex2(b);
      }

      function hex_as_rgb(hex) {
        return "rgb(" + [parseInt(hex.substring(1, 3), 16), parseInt(hex.substring(3, 5), 16), parseInt(hex.substring(5, 7), 16)] + ")";
      }

      function magnify(evt) {
        var { x: x, y: y } = cursor_point(evt);
        var centerPixelColor1, centerPixelColor2;

        var dx_lo = -Math.floor(gMagWidth / 2);
        var dx_hi = Math.floor(gMagWidth / 2);
        var dy_lo = -Math.floor(gMagHeight / 2);
        var dy_hi = Math.floor(gMagHeight / 2);

        flash_pixels(false);
        gFlashingPixels = [];
        for (var j = dy_lo; j <= dy_hi; j++) {
          for (var i = dx_lo; i <= dx_hi; i++) {
            var px = x + i;
            var py = y + j;
            var p1 = gMagPixPaths[i + dx_hi][j + dy_hi][0];
            var p2 = gMagPixPaths[i + dx_hi][j + dy_hi][1];
            // Here we just use the dimensions of gImage1Data since we expect test
            // and reference to have the same dimensions.
            if (px < 0 || py < 0 || px >= gImage1Data.width || py >= gImage1Data.height) {
              p1.setAttribute("fill", "#aaa");
              p2.setAttribute("fill", "#888");
            } else {
              var color1 = canvas_pixel_as_hex(gImage1Data, x + i, y + j);
              var color2 = canvas_pixel_as_hex(gImage2Data, x + i, y + j);
              p1.setAttribute("fill", color1);
              p2.setAttribute("fill", color2);
              if (color1 != color2) {
                gFlashingPixels.push(p1, p2);
                p1.parentNode.appendChild(p1);
                p2.parentNode.appendChild(p2);
              }
              if (i == 0 && j == 0) {
                centerPixelColor1 = color1;
                centerPixelColor2 = color2;
              }
            }
          }
        }
        flash_pixels(true);
        show_pixelinfo(x, y, centerPixelColor1, hex_as_rgb(centerPixelColor1), centerPixelColor2, hex_as_rgb(centerPixelColor2));
      }

      function show_pixelinfo(x, y, pix1rgb, pix1hex, pix2rgb, pix2hex) {
        ID("coords").textContent = [x, y];
        ID("pix1hex").textContent = pix1hex;
        ID("pix1rgb").textContent = pix1rgb;
        ID("pix2hex").textContent = pix2hex;
        ID("pix2rgb").textContent = pix2rgb;
      }

        ]]>
    </script>
  </head>
  <body onload="load()">
    <div id="entry">
      <h1>Reftest analyzer: load raw structured log</h1>

      <p>
        Either paste your log into this textarea:<br />
        <textarea cols="80" rows="10" id="logentry" /><br />
        <input
          type="button"
          value="Process pasted log"
          onclick="log_pasted()"
        />
      </p>

      <p>
        ... or load it from a file:<br />
        <input type="file" id="fileentry" onchange="fileentry_changed()" />
      </p>
    </div>

    <div id="loading" style="display: none">Loading log...</div>

    <div id="viewer" style="display: none">
      <div id="pixelarea">
        <div id="pixelinfo">
          <table>
            <tbody>
              <tr>
                <th>Pixel at:</th>
                <td colspan="2" id="coords" />
              </tr>
              <tr>
                <th>Image 1:</th>
                <td id="pix1rgb"></td>
                <td id="pix1hex"></td>
              </tr>
              <tr>
                <th>Image 2:</th>
                <td id="pix2rgb"></td>
                <td id="pix2hex"></td>
              </tr>
            </tbody>
          </table>
          <div>
            <div id="pixelhint"><div>
                <p>
                  Move the mouse over the reftest image on the right to show
                  magnified pixels on the left. The color information above is
                  for the pixel centered in the magnified view.
                </p>
                <p>
                  Image 1 is shown in the upper triangle of each pixel and Image
                  2 is shown in the lower triangle.
                </p>
              </div>
            </div>
          </div>
        </div>
        <div id="magnification">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            width="84"
            height="84"
            shape-rendering="optimizeSpeed"
          >
            <g id="mag" />
          </svg>
        </div>
      </div>
      <div id="itemlist"></div>
      <div id="images" style="display: none">
        <form id="imgcontrols">
          <input
            id="radio1"
            type="radio"
            name="which"
            value="0"
            onchange="show_image(1)"
            checked="checked"
          /><label id="label1" title="1" for="radio1">Image 1</label>
          <input
            id="radio2"
            type="radio"
            name="which"
            value="1"
            onchange="show_image(2)"
          /><label id="label2" title="2" for="radio2">Image 2</label>
          <label
            ><input
              id="differences"
              type="checkbox"
              onchange="show_differences(this)"
            />Circle differences</label
          >
        </form>
        <svg
          xmlns="http://www.w3.org/2000/svg"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          version="1.1"
          width="800"
          height="1000"
          id="svg"
        >
          <defs>
            <!-- use sRGB to avoid loss of data -->
            <filter
              id="showDifferences"
              x="0%"
              y="0%"
              width="100%"
              height="100%"
              style="color-interpolation-filters: sRGB"
            >
              <feImage id="feimage1" result="img1" xlink:href="#image1" />
              <feImage id="feimage2" result="img2" xlink:href="#image2" />
              <!-- inv1 and inv2 are the images with RGB inverted -->
              <feComponentTransfer result="inv1" in="img1">
                <feFuncR type="linear" slope="-1" intercept="1" />
                <feFuncG type="linear" slope="-1" intercept="1" />
                <feFuncB type="linear" slope="-1" intercept="1" />
              </feComponentTransfer>
              <feComponentTransfer result="inv2" in="img2">
                <feFuncR type="linear" slope="-1" intercept="1" />
                <feFuncG type="linear" slope="-1" intercept="1" />
                <feFuncB type="linear" slope="-1" intercept="1" />
              </feComponentTransfer>
              <!-- w1 will have non-white pixels anywhere that img2
               is brighter than img1, and w2 for the reverse.
               It would be nice not to have to go through these
               intermediate states, but feComposite
               type="arithmetic" can't transform the RGB channels
               and leave the alpha channel untouched. -->
              <feComposite
                result="w1"
                in="img1"
                in2="inv2"
                operator="arithmetic"
                k2="1"
                k3="1"
              />
              <feComposite
                result="w2"
                in="img2"
                in2="inv1"
                operator="arithmetic"
                k2="1"
                k3="1"
              />
              <!-- c1 will have non-black pixels anywhere that img2
               is brighter than img1, and c2 for the reverse -->
              <feComponentTransfer result="c1" in="w1">
                <feFuncR type="linear" slope="-1" intercept="1" />
                <feFuncG type="linear" slope="-1" intercept="1" />
                <feFuncB type="linear" slope="-1" intercept="1" />
              </feComponentTransfer>
              <feComponentTransfer result="c2" in="w2">
                <feFuncR type="linear" slope="-1" intercept="1" />
                <feFuncG type="linear" slope="-1" intercept="1" />
                <feFuncB type="linear" slope="-1" intercept="1" />
              </feComponentTransfer>
              <!-- c will be nonblack (and fully on) for every pixel+component where there are differences -->
              <feComposite
                result="c"
                in="c1"
                in2="c2"
                operator="arithmetic"
                k2="255"
                k3="255"
              />
              <!-- a will be opaque for every pixel with differences and transparent for all others -->
              <feColorMatrix
                result="a"
                type="matrix"
                values="0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  1 1 1 0 0"
              />

              <!-- a, dilated by 1 pixel -->
              <feMorphology
                result="dila1"
                in="a"
                operator="dilate"
                radius="1"
              />
              <!-- a, dilated by 2 pixels -->
              <feMorphology
                result="dila2"
                in="dila1"
                operator="dilate"
                radius="1"
              />

              <!-- all the pixels in the 2-pixel dilation of a but not in the 1-pixel dilation, to highlight the diffs -->
              <feComposite
                result="highlight"
                in="dila2"
                in2="dila1"
                operator="out"
              />

              <feFlood result="red" flood-color="red" />
              <feComposite
                result="redhighlight"
                in="red"
                in2="highlight"
                operator="in"
              />
              <feFlood result="black" flood-color="black" flood-opacity="0.5" />
              <feMerge>
                <feMergeNode in="black" />
                <feMergeNode in="redhighlight" />
              </feMerge>
            </filter>
          </defs>
          <g onmousemove="magnify(evt)">
            <image x="0" y="0" width="100%" height="100%" id="image1" />
            <image x="0" y="0" width="100%" height="100%" id="image2" />
          </g>
          <rect
            id="diffrect"
            filter="url(#showDifferences)"
            pointer-events="none"
            x="0"
            y="0"
            width="100%"
            height="100%"
          />
        </svg>
      </div>
    </div>
  </body>
</html>