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// Copyright 2014 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.
#ifndef CHROME_BROWSER_BITMAP_FETCHER_BITMAP_FETCHER_H_
#define CHROME_BROWSER_BITMAP_FETCHER_BITMAP_FETCHER_H_
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/bitmap_fetcher_delegate.h"
#include "chrome/browser/image_decoder.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "url/gurl.h"
namespace net {
class URLFetcher;
class URLRequestContextGetter;
} // namespace net
namespace chrome {
// Asynchrounously fetches an image from the given URL and returns the
// decoded Bitmap to the provided BitmapFetcherDelegate.
class BitmapFetcher : public net::URLFetcherDelegate,
public ImageDecoder::Delegate {
public:
BitmapFetcher(const GURL& url, BitmapFetcherDelegate* delegate);
virtual ~BitmapFetcher();
const GURL& url() const { return url_; }
// Start fetching the URL with the fetcher. The delegate is notified
// asynchronously when done. Start may be called more than once in some
// cases. If so, subsequent starts will be ignored since the operation is
// already in progress. Arguments are used to configure the internal fetcher.
// Values for |load_flags| are defined in net/base/load_flags.h. In general,
// |net::LOAD_NORMAL| is appropriate.
void Start(net::URLRequestContextGetter* request_context,
const std::string& referrer,
net::URLRequest::ReferrerPolicy referrer_policy,
int load_flags);
// Methods inherited from URLFetcherDelegate
// This will be called when the URL has been fetched, successfully or not.
// Use accessor methods on |source| to get the results.
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
// This will be called when some part of the response is read. |current|
// denotes the number of bytes received up to the call, and |total| is the
// expected total size of the response (or -1 if not determined).
virtual void OnURLFetchDownloadProgress(const net::URLFetcher* source,
int64 current,
int64 total) OVERRIDE;
// Methods inherited from ImageDecoder::Delegate
// Called when image is decoded. |decoder| is used to identify the image in
// case of decoding several images simultaneously. This will not be called
// on the UI thread.
virtual void OnImageDecoded(const ImageDecoder* decoder,
const SkBitmap& decoded_image) OVERRIDE;
// Called when decoding image failed.
virtual void OnDecodeImageFailed(const ImageDecoder* decoder) OVERRIDE;
private:
// Alerts the delegate that a failure occurred.
void ReportFailure();
scoped_ptr<net::URLFetcher> url_fetcher_;
scoped_refptr<ImageDecoder> image_decoder_;
const GURL url_;
BitmapFetcherDelegate* const delegate_;
DISALLOW_COPY_AND_ASSIGN(BitmapFetcher);
};
} // namespace chrome
#endif // CHROME_BROWSER_BITMAP_FETCHER_BITMAP_FETCHER_H_
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