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| 1 // Copyright (c) 2013 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 #ifndef CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_ | |
| 6 #define CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 #include <vector> | |
| 10 | |
| 11 #include "base/memory/scoped_vector.h" | |
| 12 #include "content/public/renderer/render_frame_observer.h" | |
| 13 #include "url/gurl.h" | |
| 14 | |
| 15 class SkBitmap; | |
| 16 | |
| 17 namespace content { | |
| 18 | |
| 19 class MultiResolutionImageResourceFetcher; | |
| 20 | |
| 21 // This class deals with image downloading. | |
| 22 // One instance of ImageLoadingHelper is owned by RenderFrame. | |
| 23 class ImageLoadingHelper : public RenderFrameObserver { | |
| 24 public: | |
| 25 explicit ImageLoadingHelper(RenderFrame* render_frame); | |
| 26 | |
| 27 private: | |
| 28 ~ImageLoadingHelper() override; | |
| 29 | |
| 30 // Message handler. | |
| 31 void OnDownloadImage(int id, | |
| 32 const GURL& image_url, | |
| 33 bool is_favicon, | |
| 34 uint32_t max_image_size, | |
| 35 bool bypass_cache); | |
| 36 | |
| 37 // Requests to download an image. When done, the ImageLoadingHelper | |
| 38 // is notified by way of DidDownloadImage. Returns true if the | |
| 39 // request was successfully started, false otherwise. id is used to | |
| 40 // uniquely identify the request and passed back to the | |
| 41 // DidDownloadImage method. If the image is a favicon, cookies will not be | |
| 42 // sent nor accepted during download. If the image has multiple frames, all | |
| 43 // the frames whose size <= |max_image_size| are returned. If all of the | |
| 44 // frames are larger than |max_image_size|, the smallest frame is resized to | |
| 45 // |max_image_size| and is the only result. |max_image_size| == 0 is | |
| 46 // interpreted as no max image size. | |
| 47 bool DownloadImage(int id, | |
| 48 const GURL& image_url, | |
| 49 bool is_favicon, | |
| 50 uint32_t max_image_size, | |
| 51 bool bypass_cache); | |
| 52 | |
| 53 // This callback is triggered when DownloadImage completes, either | |
| 54 // succesfully or with a failure. See DownloadImage for more | |
| 55 // details. | |
| 56 void DidDownloadImage( | |
| 57 uint32_t max_image_size, | |
| 58 MultiResolutionImageResourceFetcher* fetcher, | |
| 59 const std::vector<SkBitmap>& images); | |
| 60 | |
| 61 // Decodes a data: URL image or returns an empty image in case of failure. | |
| 62 SkBitmap ImageFromDataUrl(const GURL&) const; | |
| 63 | |
| 64 // RenderFrameObserver implementation. | |
| 65 bool OnMessageReceived(const IPC::Message& message) override; | |
| 66 | |
| 67 typedef ScopedVector<MultiResolutionImageResourceFetcher> | |
| 68 ImageResourceFetcherList; | |
| 69 | |
| 70 // ImageResourceFetchers schedule via DownloadImage. | |
| 71 ImageResourceFetcherList image_fetchers_; | |
| 72 | |
| 73 DISALLOW_COPY_AND_ASSIGN(ImageLoadingHelper); | |
| 74 }; | |
| 75 | |
| 76 } // namespace content | |
| 77 | |
| 78 #endif // CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_ | |
| 79 | |
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Chromium Code Reviews
Issue 1085783002:
Replace image_messages.h with Mojo service (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master