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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_
#define CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_
#include <string>
#include <vector>
#include "base/memory/scoped_vector.h"
#include "content/public/renderer/render_view_observer.h"
#include "url/gurl.h"
class SkBitmap;
namespace content {
class MultiResolutionImageResourceFetcher;
// This class deals with image downloading.
// One instance of ImageLoadingHelper is owned by RenderView.
class ImageLoadingHelper : public RenderViewObserver {
public:
explicit ImageLoadingHelper(RenderView* render_view);
private:
virtual ~ImageLoadingHelper();
// Message handler.
void OnDownloadImage(int id,
const GURL& image_url,
bool is_favicon,
uint32_t max_image_size);
// Requests to download an image. When done, the ImageLoadingHelper
// is notified by way of DidDownloadImage. Returns true if the
// request was successfully started, false otherwise. id is used to
// uniquely identify the request and passed back to the
// DidDownloadImage method. If the image is a favicon, cookies will not be
// sent nor accepted during download. If the image has multiple frames, all
// the frames whose size <= |max_image_size| are returned. If all of the
// frames are larger than |max_image_size|, the smallest frame is resized to
// |max_image_size| and is the only result. |max_image_size| == 0 is
// interpreted as no max image size.
bool DownloadImage(int id,
const GURL& image_url,
bool is_favicon,
uint32_t max_image_size);
// This callback is triggered when DownloadImage completes, either
// succesfully or with a failure. See DownloadImage for more
// details.
void DidDownloadImage(
uint32_t max_image_size,
MultiResolutionImageResourceFetcher* fetcher,
const std::vector<SkBitmap>& images);
// Decodes a data: URL image or returns an empty image in case of failure.
SkBitmap ImageFromDataUrl(const GURL&) const;
// RenderViewObserver implementation.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
typedef ScopedVector<MultiResolutionImageResourceFetcher>
ImageResourceFetcherList;
// ImageResourceFetchers schedule via DownloadImage.
ImageResourceFetcherList image_fetchers_;
DISALLOW_COPY_AND_ASSIGN(ImageLoadingHelper);
};
} // namespace content
#endif // CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_
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