| // 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 preferred_image_size, |
| 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, the |
| // frame whose size is image_size is returned. If the image doesn't |
| // have a frame at the specified size, the first is returned. |
| bool DownloadImage(int id, |
| const GURL& image_url, |
| bool is_favicon, |
| uint32_t preferred_image_size, |
| 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 preferred_image_size, |
| 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_ |
| |