Split FaviconHelper in two: ImageLoadingHelper and FaviconHelper

content/renderer/favicon_helper.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 "content/renderer/favicon_helper.h"
-
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/message_loop.h"
-#include "content/common/icon_messages.h"
-#include "content/public/renderer/render_view.h"
-#include "net/base/data_url.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebURLRequest.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebVector.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
-#include "ui/base/ui_base_switches.h"
-#include "ui/gfx/favicon_size.h"
-#include "ui/gfx/size.h"
-#include "ui/gfx/skbitmap_operations.h"
-#include "webkit/glue/image_decoder.h"
-#include "webkit/glue/multi_resolution_image_resource_fetcher.h"
-#include "webkit/glue/webkit_glue.h"
-
-using WebKit::WebFrame;
-using WebKit::WebIconURL;
-using WebKit::WebVector;
-using WebKit::WebURL;
-using WebKit::WebURLRequest;
-using webkit_glue::MultiResolutionImageResourceFetcher;
-
-namespace content {
-
-namespace {
-
-bool TouchEnabled() {
-// Based on the definition of chrome::kEnableTouchIcon.
-#if defined(OS_ANDROID)
-  return true;
-#else
-  return false;
-#endif
-}
-
-}  // namespace
-
-
-static FaviconURL::IconType ToFaviconType(WebIconURL::Type type) {
-  switch (type) {
-    case WebIconURL::TypeFavicon:
-      return FaviconURL::FAVICON;
-    case WebIconURL::TypeTouch:
-      return FaviconURL::TOUCH_ICON;
-    case WebIconURL::TypeTouchPrecomposed:
-      return FaviconURL::TOUCH_PRECOMPOSED_ICON;
-    case WebIconURL::TypeInvalid:
-      return FaviconURL::INVALID_ICON;
-  }
-  return FaviconURL::INVALID_ICON;
-}
-
-FaviconHelper::FaviconHelper(RenderView* render_view)
-    : RenderViewObserver(render_view) {
-}
-
-void FaviconHelper::DidChangeIcon(WebKit::WebFrame* frame,
-                                  WebKit::WebIconURL::Type icon_type) {
-  if (frame->parent())
-    return;
-
-  if (!TouchEnabled() && icon_type != WebIconURL::TypeFavicon)
-    return;
-
-  WebVector<WebIconURL> icon_urls = frame->iconURLs(icon_type);
-  std::vector<FaviconURL> urls;
-  for (size_t i = 0; i < icon_urls.size(); i++) {
-    urls.push_back(FaviconURL(icon_urls[i].iconURL(),
-                              ToFaviconType(icon_urls[i].iconType())));
-  }
-  SendUpdateFaviconURL(routing_id(), render_view()->GetPageId(), urls);
-}
-
-FaviconHelper::~FaviconHelper() {
-}
-
-void FaviconHelper::OnDownloadFavicon(int id,
-                                      const GURL& image_url,
-                                      int image_size) {
-  std::vector<SkBitmap> result_images;
-  if (image_url.SchemeIs("data")) {
-    SkBitmap data_image = ImageFromDataUrl(image_url);
-    if (!data_image.empty())
-      result_images.push_back(data_image);
-  } else {
-    if (DownloadFavicon(id, image_url, image_size)) {
-      // Will complete asynchronously via FaviconHelper::DidDownloadFavicon
-      return;
-    }
-  }
-
-  Send(new IconHostMsg_DidDownloadFavicon(routing_id(),
-                                          id,
-                                          image_url,
-                                          image_size,
-                                          result_images));
-}
-
-bool FaviconHelper::DownloadFavicon(int id,
-                                    const GURL& image_url,
-                                    int image_size) {
-  // Make sure webview was not shut down.
-  if (!render_view()->GetWebView())
-    return false;
-  // Create an image resource fetcher and assign it with a call back object.
-  image_fetchers_.push_back(new MultiResolutionImageResourceFetcher(
-      image_url, render_view()->GetWebView()->mainFrame(), id,
-      WebURLRequest::TargetIsFavicon,
-      base::Bind(&FaviconHelper::DidDownloadFavicon,
-                 base::Unretained(this), image_size)));
-  return true;
-}
-
-void FaviconHelper::DidDownloadFavicon(
-    int requested_size,
-    MultiResolutionImageResourceFetcher* fetcher,
-    const std::vector<SkBitmap>& images) {
-  // Notify requester of image download status.
-  Send(new IconHostMsg_DidDownloadFavicon(routing_id(),
-                                          fetcher->id(),
-                                          fetcher->image_url(),
-                                          requested_size,
-                                          images));
-
-  // Remove the image fetcher from our pending list. We're in the callback from
-  // MultiResolutionImageResourceFetcher, best to delay deletion.
-  ImageResourceFetcherList::iterator iter =
-      std::find(image_fetchers_.begin(), image_fetchers_.end(), fetcher);
-  if (iter != image_fetchers_.end()) {
-    image_fetchers_.weak_erase(iter);
-    MessageLoop::current()->DeleteSoon(FROM_HERE, fetcher);
-  }
-}
-
-SkBitmap FaviconHelper::ImageFromDataUrl(const GURL& url) const {
-  std::string mime_type, char_set, data;
-  if (net::DataURL::Parse(url, &mime_type, &char_set, &data) && !data.empty()) {
-    // Decode the favicon using WebKit's image decoder.
-    webkit_glue::ImageDecoder decoder(
-        gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize));
-    const unsigned char* src_data =
-        reinterpret_cast<const unsigned char*>(&data[0]);
-
-    return decoder.Decode(src_data, data.size());
-  }
-  return SkBitmap();
-}
-
-void FaviconHelper::SendUpdateFaviconURL(int32 routing_id,
-                                         int32 page_id,
-                                         const std::vector<FaviconURL>& urls) {
-  if (!urls.empty())
-    Send(new IconHostMsg_UpdateFaviconURL(routing_id, page_id, urls));
-}
-
-bool FaviconHelper::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(FaviconHelper, message)
-    IPC_MESSAGE_HANDLER(IconMsg_DownloadFavicon, OnDownloadFavicon)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-
-  return handled;
-}
-
-void FaviconHelper::DidStopLoading() {
-  int icon_types = WebIconURL::TypeFavicon;
-  if (TouchEnabled())
-    icon_types |= WebIconURL::TypeTouchPrecomposed | WebIconURL::TypeTouch;
-
-  WebVector<WebIconURL> icon_urls =
-      render_view()->GetWebView()->mainFrame()->iconURLs(icon_types);
-  std::vector<FaviconURL> urls;
-  for (size_t i = 0; i < icon_urls.size(); i++) {
-    WebURL url = icon_urls[i].iconURL();
-    if (!url.isEmpty())
-      urls.push_back(FaviconURL(url, ToFaviconType(icon_urls[i].iconType())));
-  }
-  SendUpdateFaviconURL(routing_id(), render_view()->GetPageId(), urls);
-}
-
-}  // namespace content