From 00dee2f05b854d8f36747ac8459417012bb7a61f Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Wed, 6 Jun 2018 14:24:03 +0200
Subject: Add a helper function in PlacesUIUtils.jsm to cater to HiDPI favicon
 display with #-moz-resolution=w,h

---
 .../palemoon/components/places/PlacesUIUtils.jsm   | 27 ++++++++++++++++++++++
 .../places/content/browserPlacesViews.js           |  9 +++++---
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/application/palemoon/components/places/PlacesUIUtils.jsm b/application/palemoon/components/places/PlacesUIUtils.jsm
index dd0695f78..e90c84152 100644
--- a/application/palemoon/components/places/PlacesUIUtils.jsm
+++ b/application/palemoon/components/places/PlacesUIUtils.jsm
@@ -1136,6 +1136,33 @@ this.PlacesUIUtils = {
       }
     }
     return queryName;
+  },
+
+  /**
+   * Returns the passed URL with a #moz-resolution fragment
+   * for the specified dimensions and devicePixelRatio.
+   *
+   * @param aWindow
+   *        A window from where we want to get the device
+   *        pixel Ratio
+   *
+   * @param aURL
+   *        The URL where we should add the fragment
+   *
+   * @param aWidth
+   *        The target image width
+   *
+   * @param aHeight
+   *        The target image height
+   *
+   * @return The URL with the fragment at the end
+   */
+  getImageURLForResolution:
+  function PUIU_getImageURLForResolution(aWindow, aURL, aWidth = 16, aHeight = 16) {
+    let width  = Math.round(aWidth * aWindow.devicePixelRatio);
+    let height = Math.round(aHeight * aWindow.devicePixelRatio);
+    return aURL + (aURL.contains("#") ? "&" : "#") +
+           "-moz-resolution=" + width + "," + height;
   }
 };
 
diff --git a/application/palemoon/components/places/content/browserPlacesViews.js b/application/palemoon/components/places/content/browserPlacesViews.js
index 4ab80cac6..eec7274a4 100644
--- a/application/palemoon/components/places/content/browserPlacesViews.js
+++ b/application/palemoon/components/places/content/browserPlacesViews.js
@@ -338,7 +338,8 @@ PlacesViewBase.prototype = {
 
       let icon = aPlacesNode.icon;
       if (icon)
-        element.setAttribute("image", icon);
+        element.setAttribute("image",
+                             PlacesUIUtils.getImageURLForResolution(window, icon));
     }
 
     element._placesNode = aPlacesNode;
@@ -464,7 +465,8 @@ PlacesViewBase.prototype = {
     if (!icon)
       elt.removeAttribute("image");
     else if (icon != elt.getAttribute("image"))
-      elt.setAttribute("image", icon);
+      elt.setAttribute("image",
+                       PlacesUIUtils.getImageURLForResolution(window, icon));
   },
 
   nodeAnnotationChanged:
@@ -966,7 +968,8 @@ PlacesToolbar.prototype = {
       button.setAttribute("label", aChild.title || "");
       let icon = aChild.icon;
       if (icon)
-        button.setAttribute("image", icon);
+        button.setAttribute("image",
+                            PlacesUIUtils.getImageURLForResolution(window, icon));
 
       if (PlacesUtils.containerTypes.indexOf(type) != -1) {
         button.setAttribute("type", "menu");
-- 
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