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      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_IMAGE_HOLDER_H_
      6 #define CHROME_BROWSER_IMAGE_HOLDER_H_
      7 
      8 #include "base/memory/scoped_vector.h"
      9 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
     10 #include "ui/gfx/image/image.h"
     11 #include "ui/gfx/image/image_skia.h"
     12 #include "url/gurl.h"
     13 
     14 class Profile;
     15 
     16 namespace chrome {
     17 
     18 // This provides a callback so the ImageHolder can inform its parent when a
     19 // bitmap arrives.
     20 class ImageHolderDelegate {
     21  public:
     22   virtual void OnFetchComplete() = 0;
     23 };
     24 
     25 // This class encapsulates the action of fetching a bitmap, reporting when it is
     26 // fetched, and holding onto the bitmap until no longer needed.
     27 class ImageHolder : public chrome::BitmapFetcherDelegate {
     28  public:
     29   ImageHolder(const GURL& low_dpi_url,
     30               const GURL& high_dpi_url,
     31               Profile* profile,
     32               ImageHolderDelegate* delegate);
     33   virtual ~ImageHolder();
     34 
     35   // Begin fetching of the URLs we have.
     36   void StartFetch();
     37 
     38   // Check whether we have a response from the server for these resources,
     39   // even if the response is a failed fetch.
     40   bool IsFetchingDone() const;
     41 
     42   // Inherited from BitmapFetcherDelegate
     43   virtual void OnFetchComplete(const GURL url, const SkBitmap* bitmap) OVERRIDE;
     44 
     45   // Accessors:
     46   GURL low_dpi_url() const { return low_dpi_url_; }
     47   GURL high_dpi_url() const { return high_dpi_url_; }
     48   gfx::Image low_dpi_image() { return gfx::Image(image_); }
     49 
     50  private:
     51   // Helper function to create a bitmap fetcher (but not start the fetch).
     52   void CreateBitmapFetcher(const GURL& url);
     53 
     54   GURL low_dpi_url_;
     55   GURL high_dpi_url_;
     56   bool low_dpi_fetched_;
     57   bool high_dpi_fetched_;
     58   gfx::ImageSkia image_;
     59   ImageHolderDelegate* delegate_;
     60   ScopedVector<chrome::BitmapFetcher> fetchers_;
     61   Profile* profile_;
     62 
     63   FRIEND_TEST_ALL_PREFIXES(ImageHolderTest, CreateBitmapFetcherTest);
     64   FRIEND_TEST_ALL_PREFIXES(ImageHolderTest, OnFetchCompleteTest);
     65   FRIEND_TEST_ALL_PREFIXES(ImageHolderTest, IsFetchingDoneTest);
     66 
     67   DISALLOW_COPY_AND_ASSIGN(ImageHolder);
     68 };
     69 
     70 }  // namespace chrome.
     71 
     72 #endif  // CHROME_BROWSER_IMAGE_HOLDER_H_
     73