src/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 "third_party/WebKit/public/web/WebFrame.h"
  12 #include "third_party/skia/include/core/SkBitmap.h"
  13 #include "ui/gfx/size.h"
  14
  15 using WebKit::WebFrame;
  16 using WebKit::WebURLRequest;
  17 using WebKit::WebURLResponse;
  18
  19 namespace content {
  20
  21 ImageResourceFetcher::ImageResourceFetcher(
  22     const GURL& image_url,
  23     WebFrame* frame,
  24     int id,
  25     int image_size,
  26     WebURLRequest::TargetType target_type,
  27     const Callback& callback)
  28     : callback_(callback),
  29       id_(id),
  30       image_url_(image_url),
  31       image_size_(image_size) {
  32   fetcher_.reset(new ResourceFetcher(
  33       image_url, frame, target_type,
  34       base::Bind(&ImageResourceFetcher::OnURLFetchComplete,
  35                  base::Unretained(this))));
  36
  37   // Set subresource URL for crash reporting.
  38   base::debug::SetCrashKeyValue("subresource_url", image_url.spec());
  39 }
  40
  41 ImageResourceFetcher::~ImageResourceFetcher() {
  42   if (!fetcher_->completed())
  43     fetcher_->Cancel();
  44 }
  45
  46 void ImageResourceFetcher::OnURLFetchComplete(
  47     const WebURLResponse& response,
  48     const std::string& data) {
  49   SkBitmap bitmap;
  50   if (!response.isNull() && response.httpStatusCode() == 200) {
  51     // Request succeeded, try to convert it to an image.
  52     ImageDecoder decoder(gfx::Size(image_size_, image_size_));
  53     bitmap = decoder.Decode(
  54         reinterpret_cast<const unsigned char*>(data.data()), data.size());
  55   } // else case:
  56     // If we get here, it means no image from server or couldn't decode the
  57     // response as an image. The delegate will see a null image, indicating
  58     // that an error occurred.
  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, bitmap);
  64 }
  65
  66 }  // namespace content