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      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::TargetType target_type,
     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, target_type,
     36                   base::Bind(&ImageResourceFetcher::OnURLFetchComplete,
     37                       base::Unretained(this)));
     38 
     39   // Set subresource URL for crash reporting.
     40   base::debug::SetCrashKeyValue("subresource_url", image_url.spec());
     41 }
     42 
     43 ImageResourceFetcher::~ImageResourceFetcher() {
     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
     67