Use high resolution icons where possible for streamlined hosted app icons.

chrome/browser/ui/web_applications/hosted_app_tab_helper.cc

+// Copyright 2013 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/ui/web_applications/hosted_app_tab_helper.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/extensions/crx_installer.h"
+#include "chrome/browser/favicon/favicon_tab_helper.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/web_applications/hosted_app_tab_helper_delegate.h"
+#include "chrome/common/web_application_info.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/favicon_url.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(HostedAppTabHelper);
+
+HostedAppTabHelper::HostedAppTabHelper(content::WebContents* web_contents)
+    : content::WebContentsObserver(web_contents),
+      fetch_icons_immediately_(false),
+      delegate_(NULL) {
+}
+
+HostedAppTabHelper::~HostedAppTabHelper() {
+}
+
+void HostedAppTabHelper::CreateHostedApp(
+    const WebApplicationInfo& web_app_info) {
+  // If a hosted app creation request is already pending, ignore subsequent
+  // requests.
+  if (web_app_info_)
+    return;
+
+  web_app_info_.reset(new WebApplicationInfo(web_app_info));
+
+  // It's possible for |favicon_url_candidates_| to be populated after this is
+  // called. DidUpdateFaviconURL() will resume the app creation process in this
+  // case.
+  if (!favicon_url_candidates_)
+    return;
+
+  FetchIconsIfNecessaryForCreateHostedApp();
+}
+
+void HostedAppTabHelper::SetDelegate(HostedAppTabHelperDelegate* delegate) {
+  delegate_ = delegate;
+#if defined(OS_WIN)
+  // On Windows the icons are needed for the window icon which should be fetched
+  // as soon as we have the favicon URLs.
+  fetch_icons_immediately_ = true;
+#endif
+}
+
+void HostedAppTabHelper::FetchIcons() {
+  for (std::set<GURL>::const_iterator it = favicon_url_candidates_->begin();
+       it != favicon_url_candidates_->end(); ++it)
+    in_progress_requests_.insert(DownloadImage(*it));
+
+}
+
+void HostedAppTabHelper::FetchIconsIfNecessaryForCreateHostedApp() {
+  // If the delegate doesn't need the window icon, we wouldn't have fetched the
+  // icons yet.
+  if (!fetch_icons_immediately_)
+    FetchIcons();
+
+  // If there are extra icon URLs in the WebApplicationInfo, download them.
+  for (std::vector<WebApplicationInfo::IconInfo>::const_iterator it =
+           web_app_info_->icons.begin(); it != web_app_info_->icons.end();
+       ++it) {
+    if (it->url.is_valid() && favicon_url_candidates_->count(it->url) == 0)
+      in_progress_requests_.insert(DownloadImage(it->url));
+  }
+
+  // If no downloads are pending, we can proceed directly to creating the hosted
+  // app.
+  if (in_progress_requests_.empty())
+    FinishCreateHostedApp();
+}
+
+void HostedAppTabHelper::FinishCreateHostedApp() {
+  if (web_app_info_->app_url.is_empty())
+    web_app_info_->app_url = web_contents()->GetURL();
+
+  if (web_app_info_->title.empty())
+    web_app_info_->title = web_contents()->GetTitle();
+  if (web_app_info_->title.empty())
+    web_app_info_->title = UTF8ToUTF16(web_app_info_->app_url.spec());
+
+  web_app_info_->urls.push_back(web_app_info_->app_url);
+  web_app_info_->is_bookmark_app = true;
+
+  // Add the downloaded icons.
+  for (gfx::ImageFamily::const_iterator it = image_family_.begin();
+       it != image_family_.end(); ++it) {
+    if (!it->IsEmpty()) {
+      WebApplicationInfo::IconInfo icon_info;
+      icon_info.data = it->AsBitmap();
+      icon_info.width = icon_info.data.width();
+      icon_info.height = icon_info.data.height();
+      web_app_info_->icons.push_back(icon_info);
+    }
+  }
+
+  Profile* profile =
+      Profile::FromBrowserContext(web_contents()->GetBrowserContext());
+  scoped_refptr<extensions::CrxInstaller> installer(
+      extensions::CrxInstaller::CreateSilent(profile->GetExtensionService()));
+  installer->set_error_on_unsupported_requirements(true);
+  installer->InstallWebApp(*web_app_info_);
+
+  web_app_info_.reset();
+}
+
+void HostedAppTabHelper::DidDownloadFavicon(
+    int id,
+    int http_status_code,
+    const GURL& image_url,
+    const std::vector<SkBitmap>& bitmaps,
+    const std::vector<gfx::Size>& original_bitmap_sizes) {
+  // Request canceled by DidUpdateFaviconURL() or DidNavigateMainFrame().
+  if (in_progress_requests_.erase(id) == 0)
+    return;
+  for (std::vector<SkBitmap>::const_iterator it = bitmaps.begin();
+       it != bitmaps.end(); ++it) {
+    image_family_.Add(gfx::Image::CreateFrom1xBitmap(*it));
+  }
+
+  // Once all requests have been resolved, perform post-download tasks.
+  if (!in_progress_requests_.empty())
+    return;
+
+  if (delegate_)
+    delegate_->OnWindowIconLoaded(web_contents());
+
+  if (web_app_info_)
+    FinishCreateHostedApp();
+}
+
+int HostedAppTabHelper::DownloadImage(const GURL& url) {
+  return web_contents()->DownloadImage(
+      url,
+      true,  // is_favicon
+      0,     // no max size
+      base::Bind(&HostedAppTabHelper::DidDownloadFavicon,
+                 base::Unretained(this)));
+}
+
+// content::WebContentsObserver overrides:
+void HostedAppTabHelper::DidNavigateMainFrame(
+    const content::LoadCommittedDetails& details,
+    const content::FrameNavigateParams& params) {
+  // Clear all pending requests.
+  favicon_url_candidates_.reset();
+  in_progress_requests_.clear();
+  web_app_info_.reset();
+  image_family_.clear();
+}
+
+void HostedAppTabHelper::DidUpdateFaviconURL(
+    int32 page_id,
+    const std::vector<content::FaviconURL>& candidates) {
+  in_progress_requests_.clear();
+  image_family_.clear();
+  favicon_url_candidates_.reset(new std::set<GURL>());
+  for (std::vector<content::FaviconURL>::const_iterator it = candidates.begin();
+       it != candidates.end(); ++it) {
+    if (it->icon_type != content::FaviconURL::INVALID_ICON)
+      favicon_url_candidates_->insert(it->icon_url);
+  }
+
+  if (fetch_icons_immediately_)
+    FetchIcons();
+
+  // If |web_app_info_| is populated, we are in the middle of creating a hosted
+  // app. Resume this process.
+  if (web_app_info_)
+    FetchIconsIfNecessaryForCreateHostedApp();
+}