content/renderer/fetchers/image_resource_fetcher.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_FETCHERS_IMAGE_RESOURCE_FETCHER_H_
   6 #define CONTENT_RENDERER_FETCHERS_IMAGE_RESOURCE_FETCHER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  12 #include "url/gurl.h"
  13
  14 class SkBitmap;
  15
  16 namespace blink {
  17 class WebFrame;
  18 class WebURLResponse;
  19 }
  20
  21 namespace content {
  22
  23 class ResourceFetcher;
  24
  25 // ImageResourceFetcher handles downloading an image for a webview. Once
  26 // downloading is done the supplied callback is notified. ImageResourceFetcher
  27 // is used to download the favicon and images for web apps.
  28 class ImageResourceFetcher {
  29  public:
  30   typedef base::Callback<void(ImageResourceFetcher*, const SkBitmap&)> Callback;
  31
  32   ImageResourceFetcher(const GURL& image_url,
  33                        blink::WebFrame* frame,
  34                        int id,
  35                        int image_size,
  36                        blink::WebURLRequest::RequestContext request_context,
  37                        const Callback& callback);
  38
  39   virtual ~ImageResourceFetcher();
  40
  41   // URL of the image we're downloading.
  42   const GURL& image_url() const { return image_url_; }
  43
  44   // Unique identifier for the request.
  45   int id() const { return id_; }
  46
  47  private:
  48   // ResourceFetcher::Callback. Decodes the image and invokes callback_.
  49   void OnURLFetchComplete(const blink::WebURLResponse& response,
  50                           const std::string& data);
  51
  52   Callback callback_;
  53
  54   // Unique identifier for the request.
  55   const int id_;
  56
  57   // URL of the image.
  58   const GURL image_url_;
  59
  60   // The size of the image. This is only a hint that is used if the image
  61   // contains multiple sizes. A value of 0 results in using the first frame
  62   // of the image.
  63   const int image_size_;
  64
  65   // Does the actual download.
  66   scoped_ptr<ResourceFetcher> fetcher_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(ImageResourceFetcher);
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_RENDERER_FETCHERS_IMAGE_RESOURCE_FETCHER_H_