chrome/browser/bitmap_fetcher/bitmap_fetcher.cc

   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 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
   6
   7 #include "content/public/browser/browser_thread.h"
   8 #include "net/url_request/url_fetcher.h"
   9 #include "net/url_request/url_request_context_getter.h"
  10 #include "net/url_request/url_request_status.h"
  11
  12 namespace chrome {
  13
  14 BitmapFetcher::BitmapFetcher(const GURL& url, BitmapFetcherDelegate* delegate)
  15     : url_(url), delegate_(delegate) {
  16 }
  17
  18 BitmapFetcher::~BitmapFetcher() {
  19 }
  20
  21 void BitmapFetcher::Start(net::URLRequestContextGetter* request_context,
  22                           const std::string& referrer,
  23                           net::URLRequest::ReferrerPolicy referrer_policy,
  24                           int load_flags) {
  25   if (url_fetcher_ != NULL)
  26     return;
  27
  28   url_fetcher_.reset(net::URLFetcher::Create(url_, net::URLFetcher::GET, this));
  29   url_fetcher_->SetRequestContext(request_context);
  30   url_fetcher_->SetReferrer(referrer);
  31   url_fetcher_->SetReferrerPolicy(referrer_policy);
  32   url_fetcher_->SetLoadFlags(load_flags);
  33   url_fetcher_->Start();
  34 }
  35
  36 // Methods inherited from URLFetcherDelegate.
  37
  38 void BitmapFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
  39   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  40
  41   if (source->GetStatus().status() != net::URLRequestStatus::SUCCESS) {
  42     ReportFailure();
  43     return;
  44   }
  45
  46   std::string image_data;
  47   source->GetResponseAsString(&image_data);
  48   image_decoder_ =
  49       new ImageDecoder(this, image_data, ImageDecoder::DEFAULT_CODEC);
  50
  51   // Call start to begin decoding.  The ImageDecoder will call OnImageDecoded
  52   // with the data when it is done.
  53   scoped_refptr<base::MessageLoopProxy> task_runner =
  54       content::BrowserThread::GetMessageLoopProxyForThread(
  55           content::BrowserThread::UI);
  56   image_decoder_->Start(task_runner);
  57 }
  58
  59 void BitmapFetcher::OnURLFetchDownloadProgress(const net::URLFetcher* source,
  60                                                int64 current,
  61                                                int64 total) {
  62   // Do nothing here.
  63 }
  64
  65 // Methods inherited from ImageDecoder::Delegate.
  66
  67 void BitmapFetcher::OnImageDecoded(const ImageDecoder* decoder,
  68                                    const SkBitmap& decoded_image) {
  69   // Report success.
  70   delegate_->OnFetchComplete(url_, &decoded_image);
  71 }
  72
  73 void BitmapFetcher::OnDecodeImageFailed(const ImageDecoder* decoder) {
  74   ReportFailure();
  75 }
  76
  77 void BitmapFetcher::ReportFailure() {
  78   delegate_->OnFetchComplete(url_, NULL);
  79 }
  80
  81 }  // namespace chrome