From 8e262104c25d1c2578f683109e1b373aade3a17c Mon Sep 17 00:00:00 2001
From: KN4CK3R <KN4CK3R@users.noreply.github.com>
Date: Sat, 5 Jun 2021 14:32:19 +0200
Subject: Add Image Diff for SVG files (#14867)

* Added type sniffer.

* Switched content detection from base to typesniffer.

* Added GuessContentType to Blob.

* Moved image info logic to client.
Added support for SVG images in diff.

* Restore old blocked svg behaviour.

* Added missing image formats.

* Execute image diff only when container is visible.

* add margin to spinner

* improve BIN tag on image diffs

* Default to render view.

* Show image diff on incomplete diff.

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
---
 web_src/js/features/imagediff.js | 74 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 66 insertions(+), 8 deletions(-)

(limited to 'web_src/js/features')

diff --git a/web_src/js/features/imagediff.js b/web_src/js/features/imagediff.js
index ce7ce8d2af..67e9548596 100644
--- a/web_src/js/features/imagediff.js
+++ b/web_src/js/features/imagediff.js
@@ -1,3 +1,34 @@
+function getDefaultSvgBoundsIfUndefined(svgXml, src) {
+  const DefaultSize = 300;
+  const MaxSize = 99999;
+
+  const svg = svgXml.rootElement;
+
+  const width = svg.width.baseVal;
+  const height = svg.height.baseVal;
+  if (width.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE || height.unitType === SVGLength.SVG_LENGTHTYPE_PERCENTAGE) {
+    const img = new Image();
+    img.src = src;
+    if (img.width > 1 && img.width < MaxSize && img.height > 1 && img.height < MaxSize) {
+      return {
+        width: img.width,
+        height: img.height
+      };
+    }
+    if (svg.hasAttribute('viewBox')) {
+      const viewBox = svg.viewBox.baseVal;
+      return {
+        width: DefaultSize,
+        height: DefaultSize * viewBox.width / viewBox.height
+      };
+    }
+    return {
+      width: DefaultSize,
+      height: DefaultSize
+    };
+  }
+}
+
 export default async function initImageDiff() {
   function createContext(image1, image2) {
     const size1 = {
@@ -30,34 +61,50 @@ export default async function initImageDiff() {
 
   $('.image-diff').each(function() {
     const $container = $(this);
+
+    const diffContainerWidth = $container.width() - 300;
     const pathAfter = $container.data('path-after');
     const pathBefore = $container.data('path-before');
 
     const imageInfos = [{
       loaded: false,
       path: pathAfter,
-      $image: $container.find('img.image-after')
+      $image: $container.find('img.image-after'),
+      $boundsInfo: $container.find('.bounds-info-after')
     }, {
       loaded: false,
       path: pathBefore,
-      $image: $container.find('img.image-before')
+      $image: $container.find('img.image-before'),
+      $boundsInfo: $container.find('.bounds-info-before')
     }];
 
     for (const info of imageInfos) {
       if (info.$image.length > 0) {
-        info.$image.on('load', () => {
-          info.loaded = true;
-          setReadyIfLoaded();
+        $.ajax({
+          url: info.path,
+          success: (data, _, jqXHR) => {
+            info.$image.on('load', () => {
+              info.loaded = true;
+              setReadyIfLoaded();
+            });
+            info.$image.attr('src', info.path);
+
+            if (jqXHR.getResponseHeader('Content-Type') === 'image/svg+xml') {
+              const bounds = getDefaultSvgBoundsIfUndefined(data, info.path);
+              if (bounds) {
+                info.$image.attr('width', bounds.width);
+                info.$image.attr('height', bounds.height);
+                info.$boundsInfo.hide();
+              }
+            }
+          }
         });
-        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);
@@ -81,6 +128,17 @@ export default async function initImageDiff() {
         factor = (diffContainerWidth - 24) / 2 / sizes.max.width;
       }
 
+      const widthChanged = sizes.image1.length !== 0 && sizes.image2.length !== 0 && sizes.image1[0].naturalWidth !== sizes.image2[0].naturalWidth;
+      const heightChanged = sizes.image1.length !== 0 && sizes.image2.length !== 0 && sizes.image1[0].naturalHeight !== sizes.image2[0].naturalHeight;
+      if (sizes.image1.length !== 0) {
+        $container.find('.bounds-info-after .bounds-info-width').text(`${sizes.image1[0].naturalWidth}px`).addClass(widthChanged ? 'green' : '');
+        $container.find('.bounds-info-after .bounds-info-height').text(`${sizes.image1[0].naturalHeight}px`).addClass(heightChanged ? 'green' : '');
+      }
+      if (sizes.image2.length !== 0) {
+        $container.find('.bounds-info-before .bounds-info-width').text(`${sizes.image2[0].naturalWidth}px`).addClass(widthChanged ? 'red' : '');
+        $container.find('.bounds-info-before .bounds-info-height').text(`${sizes.image2[0].naturalHeight}px`).addClass(heightChanged ? 'red' : '');
+      }
+
       sizes.image1.css({
         width: sizes.size1.width * factor,
         height: sizes.size1.height * factor
-- 
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