webkit/glue/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 "webkit/glue/image_resource_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
  10 #include "ui/gfx/size.h"
  11 #include "webkit/glue/image_decoder.h"
  12 #include "third_party/skia/include/core/SkBitmap.h"
  13
  14 using WebKit::WebFrame;
  15 using WebKit::WebURLRequest;
  16 using WebKit::WebURLResponse;
  17
  18 namespace webkit_glue {
  19
  20 ImageResourceFetcher::ImageResourceFetcher(
  21     const GURL& image_url,
  22     WebFrame* frame,
  23     int id,
  24     int image_size,
  25     WebURLRequest::TargetType target_type,
  26     const Callback& callback)
  27     : callback_(callback),
  28       id_(id),
  29       image_url_(image_url),
  30       image_size_(image_size) {
  31   fetcher_.reset(new ResourceFetcher(
  32       image_url, frame, target_type,
  33       base::Bind(&ImageResourceFetcher::OnURLFetchComplete,
  34                  base::Unretained(this))));
  35 }
  36
  37 ImageResourceFetcher::~ImageResourceFetcher() {
  38   if (!fetcher_->completed())
  39     fetcher_->Cancel();
  40 }
  41
  42 void ImageResourceFetcher::OnURLFetchComplete(
  43     const WebURLResponse& response,
  44     const std::string& data) {
  45   SkBitmap bitmap;
  46   if (!response.isNull() && response.httpStatusCode() == 200) {
  47     // Request succeeded, try to convert it to an image.
  48     ImageDecoder decoder(gfx::Size(image_size_, image_size_));
  49     bitmap = decoder.Decode(
  50         reinterpret_cast<const unsigned char*>(data.data()), data.size());
  51   } // else case:
  52     // If we get here, it means no image from server or couldn't decode the
  53     // response as an image. The delegate will see a null image, indicating
  54     // that an error occurred.
  55
  56   // Take a reference to the callback as running the callback may lead to our
  57   // destruction.
  58   Callback callback = callback_;
  59   callback.Run(this, bitmap);
  60 }
  61
  62 }  // namespace webkit_glue