chrome/browser/bitmap_fetcher.h

   1 // Copyright 2014 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 CHROME_BROWSER_BITMAP_FETCHER_H_
   6 #define CHROME_BROWSER_BITMAP_FETCHER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "chrome/browser/bitmap_fetcher_delegate.h"
  10 #include "chrome/browser/image_decoder.h"
  11 #include "net/url_request/url_fetcher_delegate.h"
  12 #include "third_party/skia/include/core/SkBitmap.h"
  13 #include "url/gurl.h"
  14
  15 namespace net {
  16 class URLFetcher;
  17 }  // namespace net
  18
  19 class Profile;
  20
  21 namespace chrome {
  22
  23 // Asynchrounously fetches an image from the given URL and returns the
  24 // decoded Bitmap to the provided BitmapFetcherDelegate.
  25 class BitmapFetcher : public net::URLFetcherDelegate,
  26                       public ImageDecoder::Delegate {
  27  public:
  28   BitmapFetcher(const GURL& url, BitmapFetcherDelegate* delegate);
  29   virtual ~BitmapFetcher();
  30
  31   const GURL& url() const { return url_; }
  32
  33   // Start fetching the URL with the fetcher. The delegate is notified
  34   // asynchronously when done.
  35   void Start(Profile* profile);
  36
  37   // Methods inherited from URLFetcherDelegate
  38
  39   // This will be called when the URL has been fetched, successfully or not.
  40   // Use accessor methods on |source| to get the results.
  41   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
  42
  43   // This will be called when some part of the response is read. |current|
  44   // denotes the number of bytes received up to the call, and |total| is the
  45   // expected total size of the response (or -1 if not determined).
  46   virtual void OnURLFetchDownloadProgress(const net::URLFetcher* source,
  47                                           int64 current,
  48                                           int64 total) OVERRIDE;
  49
  50   // Methods inherited from ImageDecoder::Delegate
  51
  52   // Called when image is decoded. |decoder| is used to identify the image in
  53   // case of decoding several images simultaneously.  This will not be called
  54   // on the UI thread.
  55   virtual void OnImageDecoded(const ImageDecoder* decoder,
  56                               const SkBitmap& decoded_image) OVERRIDE;
  57
  58   // Called when decoding image failed.
  59   virtual void OnDecodeImageFailed(const ImageDecoder* decoder) OVERRIDE;
  60
  61  private:
  62   // Alerts the delegate that a failure occurred.
  63   void ReportFailure();
  64
  65   scoped_ptr<net::URLFetcher> url_fetcher_;
  66   scoped_refptr<ImageDecoder> image_decoder_;
  67   const GURL url_;
  68   BitmapFetcherDelegate* const delegate_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(BitmapFetcher);
  71 };
  72
  73 }  // namespace chrome
  74
  75 #endif  // CHROME_BROWSER_BITMAP_FETCHER_H_