[Mac] Desaturate the Favicon for Network Errors

chrome/browser/favicon/favicon_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/favicon/favicon_utils.h"
 
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/common/url_constants.h"
+#include "components/favicon/content/content_favicon_driver.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_entry.h"
 #include "content/public/common/favicon_url.h"
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/image/image_skia_operations.h"
 
 namespace favicon {
 
+namespace {
+
+// Desaturate favicon HSL shift values.
+const double kDesaturateHue = -1.0;
+const double kDesaturateSaturation = 0.0;
+const double kDesaturateLightness = 0.6;
+}
+
 void CreateContentFaviconDriverForWebContents(
     content::WebContents* web_contents) {
   DCHECK(web_contents);
   if (ContentFaviconDriver::FromWebContents(web_contents))
     return;
 
   Profile* original_profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext())
           ->GetOriginalProfile();
   return ContentFaviconDriver::CreateForWebContents(
@@ skipping 17 matching lines @@
     return false;
   }
 
   // No favicon on Instant New Tab Pages.
   if (search::IsInstantNTP(web_contents))
     return false;
 
   return true;
 }
 
+gfx::Image TabFaviconFromWebContents(content::WebContents* contents) {
+  DCHECK(contents);
+
+  favicon::FaviconDriver* favicon_driver =
+      favicon::ContentFaviconDriver::FromWebContents(contents);
+  gfx::Image favicon = favicon_driver->GetFavicon();
+
+  // Desaturate the favicon if the navigation entry contains a network error.
+  if (!contents->IsLoadingToDifferentDocument()) {
+    const content::NavigationController& controller = contents->GetController();
+
+    content::NavigationEntry* entry = controller.GetLastCommittedEntry();
+    if (entry && (entry->GetPageType() == content::PAGE_TYPE_ERROR)) {
+      color_utils::HSL shift = {kDesaturateHue, kDesaturateSaturation,
+                                kDesaturateLightness};
+      return gfx::Image(gfx::ImageSkiaOperations::CreateHSLShiftedImage(
+          *favicon.ToImageSkia(), shift));
+    }
+  }
+
+  return favicon;
+}
+
 }  // namespace favicon