chrome/browser/image_holder.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 // This class holds the URL to an image and the bitmap for the fetched image,
   6 // and has code to fetch the bitmap from the URL.
   7
   8 #include "chrome/browser/image_holder.h"
   9
  10 #include "chrome/browser/profiles/profile.h"
  11 #include "net/base/load_flags.h"
  12
  13 namespace chrome {
  14
  15 ImageHolder::ImageHolder(const GURL& low_dpi_url,
  16                          const GURL& high_dpi_url,
  17                          Profile* profile,
  18                          ImageHolderDelegate* delegate)
  19     : low_dpi_url_(low_dpi_url),
  20       high_dpi_url_(high_dpi_url),
  21       low_dpi_fetched_(false),
  22       high_dpi_fetched_(false),
  23       delegate_(delegate),
  24       profile_(profile) {
  25
  26   // If a URL is invalid, clear it so we don't try to fetch it.
  27   if (!low_dpi_url_.is_valid()) {
  28     low_dpi_url_ = GURL();
  29   }
  30   if (!high_dpi_url_.is_valid()) {
  31     high_dpi_url_ = GURL();
  32   }
  33
  34   // Create a featcher for each URL that is set.
  35   if (!low_dpi_url_.is_empty()) {
  36     CreateBitmapFetcher(low_dpi_url_);
  37   }
  38   if (!high_dpi_url_.is_empty()) {
  39     CreateBitmapFetcher(high_dpi_url_);
  40   }
  41 }
  42
  43 ImageHolder::~ImageHolder() {}
  44
  45 // This will let us know if we have tried to fetch once and the try completed.
  46 // Currently there is no logic for retries.
  47 bool ImageHolder::IsFetchingDone() const {
  48   return ((low_dpi_url_.is_empty() || low_dpi_fetched_) &&
  49            (high_dpi_url_.is_empty() || high_dpi_fetched_));
  50 }
  51
  52 // If this bitmap has a valid GURL, create a fetcher for it.
  53 void ImageHolder::CreateBitmapFetcher(const GURL& url) {
  54   // Check for dups, ignore any request for a dup.
  55   ScopedVector<chrome::BitmapFetcher>::iterator iter;
  56   for (iter = fetchers_.begin(); iter != fetchers_.end(); ++iter) {
  57     if ((*iter)->url() == url)
  58       return;
  59   }
  60
  61   if (url.is_valid()) {
  62     fetchers_.push_back(new chrome::BitmapFetcher(url, this));
  63     DVLOG(2) << __FUNCTION__ << "Pushing bitmap " << url;
  64   }
  65 }
  66
  67 void ImageHolder::StartFetch() {
  68   // Now that we have queued them all, start the fetching.
  69   ScopedVector<chrome::BitmapFetcher>::iterator iter;
  70   for (iter = fetchers_.begin(); iter != fetchers_.end(); ++iter) {
  71     (*iter)->Start(
  72         profile_->GetRequestContext(),
  73         std::string(),
  74         net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE,
  75         net::LOAD_NORMAL);
  76   }
  77 }
  78
  79 // Method inherited from BitmapFetcher delegate.
  80 void ImageHolder::OnFetchComplete(const GURL& url, const SkBitmap* bitmap) {
  81   // TODO(petewil): Should I retry if a fetch fails?
  82   // Match the bitmap to the URL to put it into the image with the correct scale
  83   // factor.
  84   if (url == low_dpi_url_) {
  85     low_dpi_fetched_ = true;
  86     if (bitmap != NULL)
  87       image_.AddRepresentation(gfx::ImageSkiaRep(*bitmap, 1.0));
  88   } else if (url == high_dpi_url_) {
  89     high_dpi_fetched_ = true;
  90     if (bitmap != NULL)
  91       image_.AddRepresentation(gfx::ImageSkiaRep(*bitmap, 2.0));
  92   } else {
  93     DVLOG(2) << __FUNCTION__ << "Unmatched bitmap arrived " << url;
  94   }
  95
  96   // Notify callback of bitmap arrival.
  97   delegate_->OnFetchComplete();
  98 }
  99
 100 }  // namespace chrome.