content/renderer/fetchers/image_resource_fetcher.cc

   1 // Copyright (c) 2011 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/image_resource_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/debug/crash_logging.h"
  10 #include "content/child/image_decoder.h"
  11 #include "content/public/renderer/resource_fetcher.h"
  12 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  13 #include "third_party/WebKit/public/web/WebFrame.h"
  14 #include "third_party/skia/include/core/SkBitmap.h"
  15 #include "ui/gfx/size.h"
  16
  17 using blink::WebFrame;
  18 using blink::WebURLRequest;
  19 using blink::WebURLResponse;
  20
  21 namespace content {
  22
  23 ImageResourceFetcher::ImageResourceFetcher(
  24     const GURL& image_url,
  25     WebFrame* frame,
  26     int id,
  27     int image_size,
  28     WebURLRequest::RequestContext request_context,
  29     const Callback& callback)
  30     : callback_(callback),
  31       id_(id),
  32       image_url_(image_url),
  33       image_size_(image_size) {
  34   fetcher_.reset(ResourceFetcher::Create(image_url));
  35   fetcher_->Start(frame,
  36                   request_context,
  37                   WebURLRequest::FrameTypeNone,
  38                   ResourceFetcher::PLATFORM_LOADER,
  39                   base::Bind(&ImageResourceFetcher::OnURLFetchComplete,
  40                              base::Unretained(this)));
  41
  42   // Set subresource URL for crash reporting.
  43   base::debug::SetCrashKeyValue("subresource_url", image_url.spec());
  44 }
  45
  46 ImageResourceFetcher::~ImageResourceFetcher() {
  47 }
  48
  49 void ImageResourceFetcher::OnURLFetchComplete(
  50     const WebURLResponse& response,
  51     const std::string& data) {
  52   SkBitmap bitmap;
  53   if (!response.isNull() && response.httpStatusCode() == 200) {
  54     // Request succeeded, try to convert it to an image.
  55     ImageDecoder decoder(gfx::Size(image_size_, image_size_));
  56     bitmap = decoder.Decode(
  57         reinterpret_cast<const unsigned char*>(data.data()), data.size());
  58   } // else case:
  59     // If we get here, it means no image from server or couldn't decode the
  60     // response as an image. The delegate will see a null image, indicating
  61     // that an error occurred.
  62
  63   // Take a reference to the callback as running the callback may lead to our
  64   // destruction.
  65   Callback callback = callback_;
  66   callback.Run(this, bitmap);
  67 }
  68
  69 }  // namespace content