Add Image Diff options in Pull Request Diff view (#14450)

Implemented GitHub style image diff

options/locale/locale_en-US.ini

@@ -1854,6 +1854,9 @@ diff.review.approve = Approve
 diff.review.reject = Request changes
 diff.committed_by = committed by
 diff.protected = Protected
+diff.image.side_by_side = Side by Side
+diff.image.swipe = Swipe
+diff.image.overlay = Overlay
 
 releases.desc = Track project versions and downloads.
 release.releases = Releases

templates/repo/diff/image_diff.tmpl

@@ -1,36 +1,28 @@
 {{ $imagePathOld := printf "%s/%s" .root.BeforeRawPath (EscapePound .file.OldName)  }}
 {{ $imagePathNew := printf "%s/%s" .root.RawPath (EscapePound .file.Name)  }}
-
-<tr>
- 	<th class="halfwidth center pl-3 pr-2">
- 		{{.root.i18n.Tr "repo.diff.file_before"}}
- 	</th>
- 	<th class="halfwidth center pl-2 pr-3">
- 		{{.root.i18n.Tr "repo.diff.file_after"}}
- 	</th>
-</tr>
-<tr>
- 	<td class="halfwidth center pl-3 pr-2">
- 	    {{if or .file.IsDeleted (not .file.IsCreated)}}
-            <a href="{{$imagePathOld}}" target="_blank">
-                <img src="{{$imagePathOld}}" class="border red" />
-            </a>
- 	    {{end}}
- 	</td>
- 	<td class="halfwidth center pl-2 pr-3">
- 	    {{if or .file.IsCreated (not .file.IsDeleted)}}
-			<a href="{{$imagePathNew}}" target="_blank">
-				<img src="{{$imagePathNew}}" class="border green" />
-			</a>
- 	    {{end}}
- 	</td>
-</tr>
 {{ $imageInfoBase := (call .root.ImageInfoBase .file.OldName) }}
 {{ $imageInfoHead := (call .root.ImageInfo .file.Name) }}
 {{if or $imageInfoBase $imageInfoHead}}
 <tr>
- 	<td class="halfwidth center pl-3 pr-2">
+	<td colspan="2">
+		<div class="image-diff" data-path-before="{{$imagePathOld}}" data-path-after="{{$imagePathNew}}">
+			<div class="ui secondary pointing tabular top attached borderless menu stackable new-menu">
+				<div class="new-menu-inner">
+					<a class="item active" data-tab="diff-side-by-side">{{.root.i18n.Tr "repo.diff.image.side_by_side"}}</a>
+					{{if and $imageInfoBase $imageInfoHead}}
+					<a class="item" data-tab="diff-swipe">{{.root.i18n.Tr "repo.diff.image.swipe"}}</a>
+					<a class="item" data-tab="diff-overlay">{{.root.i18n.Tr "repo.diff.image.overlay"}}</a>
+					{{end}}
+				</div>
+			</div>
+			<div class="hide">
+				<div class="ui bottom attached tab image-diff-container active" data-tab="diff-side-by-side">
+					<div class="diff-side-by-side">
 						{{if $imageInfoBase }}
+						<span class="side">
+							<p class="side-header">{{.root.i18n.Tr "repo.diff.file_before"}}</p>
+							<span class="before-container"><img class="image-before" /></span>
+							<p>
 								{{ $classWidth := "" }}
 								{{ $classHeight := "" }}
 								{{ $classByteSize := "" }}
@@ -50,10 +42,14 @@
 								{{.root.i18n.Tr "repo.diff.file_image_height"}}: <span class="text {{$classHeight}}">{{$imageInfoBase.Height}}</span>
 								&nbsp;|&nbsp;
 								{{.root.i18n.Tr "repo.diff.file_byte_size"}}: <span class="text {{$classByteSize}}">{{FileSize $imageInfoBase.ByteSize}}</span>
+							</p>
+						</span>
 						{{end}}
- 	</td>
- 	<td class="halfwidth center pl-2 pr-3">
 						{{if $imageInfoHead }}
+						<span class="side">
+							<p class="side-header">{{.root.i18n.Tr "repo.diff.file_after"}}</p>
+							<span class="after-container"><img class="image-after" /></span>
+							<p>
 								{{ $classWidth := "" }}
 								{{ $classHeight := "" }}
 								{{ $classByteSize := "" }}
@@ -73,7 +69,41 @@
 								{{.root.i18n.Tr "repo.diff.file_image_height"}}: <span class="text {{$classHeight}}">{{$imageInfoHead.Height}}</span>
 								&nbsp;|&nbsp;
 								{{.root.i18n.Tr "repo.diff.file_byte_size"}}: <span class="text {{$classByteSize}}">{{FileSize $imageInfoHead.ByteSize}}</span>
+							</p>
+						</span>
 						{{end}}
+					</div>
+				</div>
+				{{if and $imageInfoBase $imageInfoHead}}
+				<div class="ui bottom attached tab image-diff-container" data-tab="diff-swipe">
+					<div class="diff-swipe">
+						<div class="swipe-frame">
+							<span class="before-container"><img class="image-before" /></span>
+							<span class="swipe-container">
+								<span class="after-container"><img class="image-after" /></span>
+							</span>
+							<span class="swipe-bar">
+								<span class="handle top-handle"></span>
+								<span class="handle bottom-handle"></span>
+							</span>
+						</div>
+					</div>
+				</div>
+				<div class="ui bottom attached tab image-diff-container" data-tab="diff-overlay">
+					<div class="diff-overlay">
+						<div class="overlay-frame">
+							<div class="ui centered">
+								<input type="range" min="0" max="100" value="50" />
+							</div>
+							<span class="before-container"><img class="image-before"/></span>
+							<span class="after-container"><img class="image-after" /></span>
+						</div>
+					</div>
+				</div>
+				{{end}}
+			</div>
+			<div class="ui active centered inline loader"></div>
+		</div>
 	</td>
 </tr>
 {{end}}

web_src/js/features/imagediff.js

@@ -0,0 +1,206 @@
+export default async function initImageDiff() {
+  function createContext(image1, image2) {
+    const size1 = {
+      width: image1 && image1.width || 0,
+      height: image1 && image1.height || 0
+    };
+    const size2 = {
+      width: image2 && image2.width || 0,
+      height: image2 && image2.height || 0
+    };
+    const max = {
+      width: Math.max(size2.width, size1.width),
+      height: Math.max(size2.height, size1.height)
+    };
+
+    return {
+      image1: $(image1),
+      image2: $(image2),
+      size1,
+      size2,
+      max,
+      ratio: [
+        Math.floor(max.width - size1.width) / 2,
+        Math.floor(max.height - size1.height) / 2,
+        Math.floor(max.width - size2.width) / 2,
+        Math.floor(max.height - size2.height) / 2
+      ]
+    };
+  }
+
+  $('.image-diff').each(function() {
+    const $container = $(this);
+    const pathAfter = $container.data('path-after');
+    const pathBefore = $container.data('path-before');
+
+    const imageInfos = [{
+      loaded: false,
+      path: pathAfter,
+      $image: $container.find('img.image-after')
+    }, {
+      loaded: false,
+      path: pathBefore,
+      $image: $container.find('img.image-before')
+    }];
+
+    for (const info of imageInfos) {
+      if (info.$image.length > 0) {
+        info.$image.on('load', () => {
+          info.loaded = true;
+          setReadyIfLoaded();
+        });
+        info.$image.attr('src', info.path);
+      } else {
+        info.loaded = true;
+        setReadyIfLoaded();
+      }
+    }
+
+    const diffContainerWidth = $container.width() - 300;
+
+    function setReadyIfLoaded() {
+      if (imageInfos[0].loaded && imageInfos[1].loaded) {
+        initViews(imageInfos[0].$image, imageInfos[1].$image);
+      }
+    }
+
+    function initViews($imageAfter, $imageBefore) {
+      initSideBySide(createContext($imageAfter[0], $imageBefore[0]));
+      if ($imageAfter.length > 0 && $imageBefore.length > 0) {
+        initSwipe(createContext($imageAfter[1], $imageBefore[1]));
+        initOverlay(createContext($imageAfter[2], $imageBefore[2]));
+      }
+
+      $container.find('> .loader').hide();
+      $container.find('> .hide').removeClass('hide');
+    }
+
+    function initSideBySide(sizes) {
+      let factor = 1;
+      if (sizes.max.width > (diffContainerWidth - 24) / 2) {
+        factor = (diffContainerWidth - 24) / 2 / sizes.max.width;
+      }
+
+      sizes.image1.css({
+        width: sizes.size1.width * factor,
+        height: sizes.size1.height * factor
+      });
+      sizes.image1.parent().css({
+        margin: `${sizes.ratio[1] * factor + 15}px ${sizes.ratio[0] * factor}px ${sizes.ratio[1] * factor}px`,
+        width: sizes.size1.width * factor + 2,
+        height: sizes.size1.height * factor + 2
+      });
+      sizes.image2.css({
+        width: sizes.size2.width * factor,
+        height: sizes.size2.height * factor
+      });
+      sizes.image2.parent().css({
+        margin: `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`,
+        width: sizes.size2.width * factor + 2,
+        height: sizes.size2.height * factor + 2
+      });
+    }
+
+    function initSwipe(sizes) {
+      let factor = 1;
+      if (sizes.max.width > diffContainerWidth - 12) {
+        factor = (diffContainerWidth - 12) / sizes.max.width;
+      }
+
+      sizes.image1.css({
+        width: sizes.size1.width * factor,
+        height: sizes.size1.height * factor
+      });
+      sizes.image1.parent().css({
+        margin: `0px ${sizes.ratio[0] * factor}px`,
+        width: sizes.size1.width * factor + 2,
+        height: sizes.size1.height * factor + 2
+      });
+      sizes.image1.parent().parent().css({
+        padding: `${sizes.ratio[1] * factor}px 0 0 0`,
+        width: sizes.max.width * factor + 2
+      });
+      sizes.image2.css({
+        width: sizes.size2.width * factor,
+        height: sizes.size2.height * factor
+      });
+      sizes.image2.parent().css({
+        margin: `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`,
+        width: sizes.size2.width * factor + 2,
+        height: sizes.size2.height * factor + 2
+      });
+      sizes.image2.parent().parent().css({
+        width: sizes.max.width * factor + 2,
+        height: sizes.max.height * factor + 2
+      });
+      $container.find('.diff-swipe').css({
+        width: sizes.max.width * factor + 2,
+        height: sizes.max.height * factor + 4
+      });
+      $container.find('.swipe-bar').on('mousedown', function(e) {
+        e.preventDefault();
+
+        const $swipeBar = $(this);
+        const $swipeFrame = $swipeBar.parent();
+        const width = $swipeFrame.width() - $swipeBar.width() - 2;
+
+        $(document).on('mousemove.diff-swipe', (e2) => {
+          e2.preventDefault();
+
+          const value = Math.max(0, Math.min(e2.clientX - $swipeFrame.offset().left, width));
+
+          $swipeBar.css({
+            left: value
+          });
+          $container.find('.swipe-container').css({
+            width: $swipeFrame.width() - value
+          });
+          $(document).on('mouseup.diff-swipe', () => {
+            $(document).off('.diff-swipe');
+          });
+        });
+      });
+    }
+
+    function initOverlay(sizes) {
+      let factor = 1;
+      if (sizes.max.width > diffContainerWidth - 12) {
+        factor = (diffContainerWidth - 12) / sizes.max.width;
+      }
+
+      sizes.image1.css({
+        width: sizes.size1.width * factor,
+        height: sizes.size1.height * factor
+      });
+      sizes.image2.css({
+        width: sizes.size2.width * factor,
+        height: sizes.size2.height * factor
+      });
+      sizes.image1.parent().css({
+        margin: `${sizes.ratio[1] * factor}px ${sizes.ratio[0] * factor}px`,
+        width: sizes.size1.width * factor + 2,
+        height: sizes.size1.height * factor + 2
+      });
+      sizes.image2.parent().css({
+        margin: `${sizes.ratio[3] * factor}px ${sizes.ratio[2] * factor}px`,
+        width: sizes.size2.width * factor + 2,
+        height: sizes.size2.height * factor + 2
+      });
+      sizes.image2.parent().parent().css({
+        width: sizes.max.width * factor + 2,
+        height: sizes.max.height * factor + 2
+      });
+      $container.find('.onion-skin').css({
+        width: sizes.max.width * factor + 2,
+        height: sizes.max.height * factor + 4
+      });
+
+      const $range = $container.find("input[type='range'");
+      const onInput = () => sizes.image1.parent().css({
+        opacity: $range.val() / 100
+      });
+      $range.on('input', onInput);
+      onInput();
+    }
+  });
+}

web_src/js/index.js

@@ -20,6 +20,7 @@ import attachTribute from './features/tribute.js';
 import createColorPicker from './features/colorpicker.js';
 import createDropzone from './features/dropzone.js';
 import initTableSort from './features/tablesort.js';
+import initImageDiff from './features/imagediff.js';
 import ActivityTopAuthors from './components/ActivityTopAuthors.vue';
 import {initNotificationsTable, initNotificationCount} from './features/notification.js';
 import {initStopwatch} from './features/stopwatch.js';
@@ -2693,6 +2694,7 @@ $(document).ready(async () => {
     initStopwatch(),
     renderMarkdownContent(),
     initGithook(),
+    initImageDiff(),
   ]);
 });
 

web_src/less/features/imagediff.less

@@ -0,0 +1,105 @@
+.image-diff-container {
+  text-align: center;
+  padding: 30px 0;
+
+  img {
+    border: 1px solid var(--color-primary-light-7);
+    background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAG0lEQVQYlWN4+vTpf3SMDTAMBYXYBLFpHgoKAeiOf0SGE9kbAAAAAElFTkSuQmCC) right bottom var(--color-primary-light-7);
+  }
+
+  .before-container {
+    border: 1px solid var(--color-red);
+    display: block;
+  }
+
+  .after-container {
+    border: 1px solid var(--color-green);
+    display: block;
+  }
+
+  .diff-side-by-side {
+    .side {
+      display: inline-block;
+      line-height: 0;
+      vertical-align: top;
+
+      .side-header {
+        font-weight: bold;
+      }
+    }
+  }
+
+  .diff-swipe {
+    margin: auto;
+
+    .swipe-frame {
+      position: absolute;
+
+      .before-container {
+        position: absolute;
+      }
+
+      .swipe-container {
+        position: absolute;
+        right: 0;
+        display: block;
+        border-left: 2px solid var(--color-secondary-dark-8);
+        height: 100%;
+        overflow: hidden;
+
+        .after-container {
+          position: absolute;
+          right: 0;
+        }
+      }
+
+      .swipe-bar {
+        z-index: 100;
+        position: absolute;
+        height: 100%;
+        top: 0;
+        left: 0;
+
+        .handle {
+          background: var(--color-secondary-dark-8);
+          left: -5px;
+          height: 12px;
+          width: 12px;
+          position: absolute;
+          transform: rotate(45deg);
+          box-sizing: border-box;
+          display: flex;
+          justify-content: center;
+          align-items: center;
+          cursor: pointer;
+        }
+
+        .top-handle {
+          top: -12px;
+        }
+
+        .bottom-handle {
+          bottom: -14px;
+        }
+      }
+    }
+  }
+
+  .diff-overlay {
+    margin: 0 auto;
+
+    .overlay-frame {
+      margin: 0 auto;
+      position: relative;
+    }
+
+    .before-container,
+    .after-container {
+      position: absolute;
+    }
+
+    input {
+      width: 300px;
+    }
+  }
+}

web_src/less/index.less

@@ -5,6 +5,7 @@
 @import "./features/gitgraph.less";
 @import "./features/animations.less";
 @import "./features/heatmap.less";
+@import "./features/imagediff.less";
 @import "./markdown/mermaid.less";
 
 @import "./chroma/base.less";