content/renderer/fetchers/multi_resolution_image_resource_fetcher.cc

   1 // Copyright (c) 2012 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 "content/renderer/fetchers/multi_resolution_image_resource_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "content/child/image_decoder.h"
  10 #include "content/public/renderer/resource_fetcher.h"
  11 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  12 #include "third_party/WebKit/public/web/WebFrame.h"
  13 #include "third_party/skia/include/core/SkBitmap.h"
  14 #include "ui/gfx/size.h"
  15
  16 using blink::WebFrame;
  17 using blink::WebURLRequest;
  18 using blink::WebURLResponse;
  19
  20 namespace content {
  21
  22 MultiResolutionImageResourceFetcher::MultiResolutionImageResourceFetcher(
  23     const GURL& image_url,
  24     WebFrame* frame,
  25     int id,
  26     WebURLRequest::RequestContext request_context,
  27     const Callback& callback)
  28     : callback_(callback),
  29       id_(id),
  30       http_status_code_(0),
  31       image_url_(image_url) {
  32   fetcher_.reset(ResourceFetcher::Create(image_url));
  33   fetcher_->Start(
  34       frame,
  35       request_context,
  36       WebURLRequest::FrameTypeNone,
  37       base::Bind(&MultiResolutionImageResourceFetcher::OnURLFetchComplete,
  38                  base::Unretained(this)));
  39 }
  40
  41 MultiResolutionImageResourceFetcher::~MultiResolutionImageResourceFetcher() {
  42 }
  43
  44 void MultiResolutionImageResourceFetcher::OnURLFetchComplete(
  45     const WebURLResponse& response,
  46     const std::string& data) {
  47   std::vector<SkBitmap> bitmaps;
  48   if (!response.isNull()) {
  49     http_status_code_ = response.httpStatusCode();
  50     GURL url(response.url());
  51     if (http_status_code_ == 200 || url.SchemeIsFile()) {
  52       // Request succeeded, try to convert it to an image.
  53       bitmaps = ImageDecoder::DecodeAll(
  54           reinterpret_cast<const unsigned char*>(data.data()), data.size());
  55     }
  56   } // else case:
  57     // If we get here, it means no image from server or couldn't decode the
  58     // response as an image. The delegate will see an empty vector.
  59
  60   // Take a reference to the callback as running the callback may lead to our
  61   // destruction.
  62   Callback callback = callback_;
  63   callback.Run(this, bitmaps);
  64 }
  65
  66 }  // namespace content