Prioritize smaller favicons over larger ones for tabs, etc.

chrome/browser/favicon/favicon_handler.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_handler.h"
 
 #include "build/build_config.h"
 
 #include <vector>
 
@@ skipping 83 matching lines @@
 }
 
 void FaviconHandler::FetchFavicon(const GURL& url) {
   cancelable_consumer_.CancelAllRequests();
 
   url_ = url;
 
   favicon_expired_ = got_favicon_from_history_ = false;
   current_url_index_ = 0;
   urls_.clear();
+  favicon_candidates_.clear();
 
   // Request the favicon from the history service. In parallel to this the
   // renderer is going to notify us (well TabContents) when the favicon url is
   // available.
   if (GetFaviconService()) {
     GetFaviconForURL(url_, icon_types_, &cancelable_consumer_,
         base::Bind(&FaviconHandler::OnFaviconDataForInitialURL,
                    base::Unretained(this)));
   }
 }
 
 int FaviconHandler::DownloadImage(
     const GURL& image_url,
     int image_size,
     history::IconType icon_type,
     const FaviconTabHelper::ImageDownloadCallback& callback) {
   return ScheduleDownload(GURL(), image_url, image_size, icon_type, callback);
 }
 
 FaviconService* FaviconHandler::GetFaviconService() {
   return profile_->GetFaviconService(Profile::EXPLICIT_ACCESS);
 }
 
+void FaviconHandler::AddFaviconCandidate(
+    const GURL& url,
+    const GURL& image_url,
+    const gfx::Image& image,
+    history::IconType icon_type) {
+  FaviconCandidate candidate;
+  candidate.url = url;
+  candidate.image_url = image_url;
+  candidate.image = image;
+  candidate.icon_type = icon_type;
+  favicon_candidates_.push_back(candidate);
+}
+
+void FaviconHandler::SetFaviconFromCandidates() {
+  if (favicon_candidates_.empty())
+    return;
+  const int preferred_size = preferred_icon_size();
+  FaviconCandidates::iterator match;
+  if (preferred_size == 0) {
+    // No size preference, use the first icon.
+    match = favicon_candidates_.begin();
+  } else {
+    // Use the icon closest to preferred_, favoring sizes >= preferred_size.
+    int match_size = -1;
+    for (FaviconCandidates::iterator iter = favicon_candidates_.begin();
+         iter != favicon_candidates_.end(); ++iter) {
+      FaviconCandidate& candidate = *iter;
+      SkBitmap bitmap = *candidate.image.ToSkBitmap();
+      int bitmap_size = std::max(bitmap.width(), bitmap.height());
+      if (match_size < 0 ||
+          (bitmap_size >= preferred_size && bitmap_size < match_size) ||
+          (match_size < preferred_size && bitmap_size > match_size)) {
+        match = iter;
+      }
+    }
+  }
+  SetFavicon(match->url, match->image_url, match->image, match->icon_type);
+  favicon_candidates_.clear();
+}
+
 void FaviconHandler::SetFavicon(
     const GURL& url,
     const GURL& image_url,
     const gfx::Image& image,
     history::IconType icon_type) {
-  const SkBitmap& bitmap = image;
+  SkBitmap bitmap = *image.ToSkBitmap();
   const gfx::Image& sized_image = (preferred_icon_size() == 0 ||
       (preferred_icon_size() == bitmap.width() &&
        preferred_icon_size() == bitmap.height())) ?
       image : ResizeFaviconIfNeeded(image);
 
   if (GetFaviconService() && ShouldSaveFavicon(url)) {
     std::vector<unsigned char> image_data;
     if (gfx::PNGEncodedDataFromImage(sized_image, &image_data))
       SetHistoryFavicon(url, image_url, image_data, icon_type);
   }
@@ skipping 86 matching lines @@
   }
 
   if (!i->second.callback.is_null()) {
     i->second.callback.Run(id, errored, *(&image));
   } else if (current_candidate() &&
              DoUrlAndIconMatch(*current_candidate(), image_url,
                                i->second.icon_type)) {
     // The downloaded icon is still valid when there is no FaviconURL update
     // during the downloading.
     if (!errored) {
-      SetFavicon(i->second.url, image_url, image, i->second.icon_type);
-    } else if (GetEntry() && ++current_url_index_ < urls_.size()) {
-      // Copies all candidate except first one and notifies the FaviconHandler,
+      AddFaviconCandidate(i->second.url, image_url, image, i->second.icon_type);
+    }
+    if ((errored || preferred_icon_size() != 0) &&
+        (GetEntry() && ++current_url_index_ < urls_.size())) {
+      // Copies all candidates except the first and notifies the FaviconHandler,
       // so the next candidate can be processed.
       std::vector<FaviconURL> new_candidates(urls_.begin() + 1, urls_.end());
       OnUpdateFaviconURL(0, new_candidates);
+    } else {
+      // We have all candidates, choose one and set the favicon.
+      SetFaviconFromCandidates();
     }
   }
   download_requests_.erase(i);
 }
 
 NavigationEntry* FaviconHandler::GetEntry() {
   NavigationEntry* entry = delegate_->GetActiveEntry();
   if (entry && entry->GetURL() == url_)
     return entry;
 
@@ skipping 196 matching lines @@
   if (width > 0 && height > 0) {
     gfx::CalculateFaviconTargetSize(&width, &height);
     return gfx::Image(new SkBitmap(
                           skia::ImageOperations::Resize(
                               bitmap, skia::ImageOperations::RESIZE_LANCZOS3,
                               width, height)));
   }
 
   return image;
 }