Continue bitmap fetching for notifications.

chrome/browser/notifications/sync_notifier/notification_bitmap_fetcher.cc

+// Copyright (c) 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/notifications/sync_notifier/notification_bitmap_fetcher.h"
+
+#include "content/public/browser/browser_thread.h"
+#include "net/url_request/url_fetcher.h"
+
+namespace notifier {
+
+NotificationBitmapFetcher::NotificationBitmapFetcher(
+    const GURL& url,
+    NotificationBitmapFetcherDelegate* delegate)
+    : url_(url), delegate_(delegate) {}
+
+NotificationBitmapFetcher::~NotificationBitmapFetcher() {}
+
+void NotificationBitmapFetcher::Start() {
+  if (url_fetcher_ == NULL) {
+    url_fetcher_.reset(
+        net::URLFetcher::Create(url_, net::URLFetcher::GET, this));
+  }
+  url_fetcher_->Start();
+}
+
+void NotificationBitmapFetcher::SetURLFetcherForTest(
+    scoped_ptr<net::URLFetcher> url_fetcher) {
+  url_fetcher_ = url_fetcher.Pass();
+}
+
+// Methods inherited from URLFetcherDelegate.
+
+void NotificationBitmapFetcher::OnURLFetchComplete(
+    const net::URLFetcher* source) {
+  std::string image_data;
+
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  // Copy the data into the string.  Keep in mind it may have embedded nulls.
+  source->GetResponseAsString(&image_data);
+
+  // Handle fetch failure.  If it failed, set failed to true, and fire
+  // notification to listeners.
+  if (image_data.length() == 0) {
+    OnDecodeImageFailed(NULL);
+    return;
+  }
+
+  // Create an ImageDecoder with the data and assign it to the refptr.
+  image_decoder_ = new ImageDecoder(this, image_data,
+                                    ImageDecoder::DEFAULT_CODEC);
+
+  // Call start to begin decoding.  The ImageDecoder will call OnImageDecoded
+  // with the data when it is done.
+  scoped_refptr<base::MessageLoopProxy> task_runner =
+      content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::UI);
+  image_decoder_->Start(task_runner);
+}
+
+void NotificationBitmapFetcher::OnURLFetchDownloadProgress(
+    const net::URLFetcher* source, int64 current, int64 total) {
+  // Do nothing here.
+}
+
+// Methods inherited from ImageDecoder::Delegate.
+
+void NotificationBitmapFetcher::OnImageDecoded(
+    const ImageDecoder* decoder, const SkBitmap& decoded_image) {
+  // Make a copy of the bitmap which we pass back to the UI thread.
+  bitmap_.reset(new SkBitmap());
+  decoded_image.deepCopyTo(bitmap_.get(), decoded_image.getConfig());
+
+  // Report success.
+  delegate_->OnFetchComplete(bitmap_.get());
+}
+
+void NotificationBitmapFetcher::OnDecodeImageFailed(
+    const ImageDecoder* decoder) {
+
+  // Report failure.
+  delegate_->OnFetchComplete(NULL);
+}
+
+}  // namespace notifier