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| 1 // Copyright (c) 2009 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 "chrome/browser/image_loading_tracker.h" | |
| 6 | |
| 7 #include "app/gfx/favicon_size.h" | |
| 8 #include "base/file_util.h" | |
| 9 #include "base/logging.h" | |
| 10 #include "base/message_loop.h" | |
| 11 #include "base/scoped_ptr.h" | |
| 12 #include "base/task.h" | |
| 13 #include "base/thread.h" | |
| 14 #include "chrome/browser/browser_process.h" | |
| 15 #include "skia/ext/image_operations.h" | |
| 16 #include "third_party/skia/include/core/SkBitmap.h" | |
| 17 #include "webkit/glue/image_decoder.h" | |
| 18 | |
| 19 //////////////////////////////////////////////////////////////////////////////// | |
| 20 // ImageLoadingTracker::LoadImageTask | |
| 21 | |
| 22 // The LoadImageTask is for asynchronously loading the image on the file thread. | |
| 23 // If the image is successfully loaded and decoded it will report back on the | |
| 24 // |callback_loop| to let the caller know the image is done loading. | |
| 25 class ImageLoadingTracker::LoadImageTask : public Task { | |
| 26 public: | |
| 27 // Constructor for the LoadImageTask class. |tracker| is the object that | |
| 28 // we use to communicate back to the entity that wants the image after we | |
| 29 // decode it. |path| is the path to load the image from. |index| is an | |
| 30 // identifier for the image that we pass back to the caller. | |
| 31 LoadImageTask(ImageLoadingTracker* tracker, | |
| 32 const FilePath& path, | |
| 33 size_t index) | |
| 34 : callback_loop_(MessageLoop::current()), | |
| 35 tracker_(tracker), | |
| 36 path_(path), | |
| 37 index_(index) {} | |
| 38 | |
| 39 void ReportBack(SkBitmap* image) { | |
| 40 DCHECK(image); | |
| 41 callback_loop_->PostTask(FROM_HERE, NewRunnableMethod(tracker_, | |
| 42 &ImageLoadingTracker::OnImageLoaded, | |
| 43 image, | |
| 44 index_)); | |
| 45 } | |
| 46 | |
| 47 virtual void Run() { | |
| 48 // Read the file from disk. | |
| 49 std::string file_contents; | |
| 50 if (!file_util::PathExists(path_) || | |
| 51 !file_util::ReadFileToString(path_, &file_contents)) { | |
| 52 ReportBack(NULL); | |
| 53 return; | |
| 54 } | |
| 55 | |
| 56 // Decode the image using WebKit's image decoder. | |
| 57 const unsigned char* data = | |
| 58 reinterpret_cast<const unsigned char*>(file_contents.data()); | |
| 59 webkit_glue::ImageDecoder decoder(gfx::Size(kFavIconSize, kFavIconSize)); | |
| 60 scoped_ptr<SkBitmap> decoded(new SkBitmap()); | |
| 61 *decoded = decoder.Decode(data, file_contents.length()); | |
| 62 if (decoded->empty()) { | |
| 63 ReportBack(NULL); | |
| 64 return; // Unable to decode. | |
| 65 } | |
| 66 | |
| 67 if (decoded->width() != kFavIconSize || decoded->height() != kFavIconSize) { | |
| 68 // The bitmap is not the correct size, re-sample. | |
| 69 int new_width = decoded->width(); | |
| 70 int new_height = decoded->height(); | |
| 71 // Calculate what dimensions to use within the constraints (16x16 max). | |
| 72 calc_favicon_target_size(&new_width, &new_height); | |
| 73 *decoded = skia::ImageOperations::Resize( | |
| 74 *decoded, skia::ImageOperations::RESIZE_LANCZOS3, | |
| 75 new_width, new_height); | |
| 76 } | |
| 77 | |
| 78 ReportBack(decoded.release()); | |
| 79 } | |
| 80 | |
| 81 private: | |
| 82 // The message loop that we need to call back on to report that we are done. | |
| 83 MessageLoop* callback_loop_; | |
| 84 | |
| 85 // The object that is waiting for us to respond back. | |
| 86 ImageLoadingTracker* tracker_; | |
| 87 | |
| 88 // The path to the image to load asynchronously. | |
| 89 FilePath path_; | |
| 90 | |
| 91 // The index of the icon being loaded. | |
| 92 size_t index_; | |
| 93 }; | |
| 94 | |
| 95 //////////////////////////////////////////////////////////////////////////////// | |
| 96 // ImageLoadingTracker | |
| 97 | |
| 98 void ImageLoadingTracker::PostLoadImageTask(FilePath path) { | |
| 99 MessageLoop* file_loop = g_browser_process->file_thread()->message_loop(); | |
| 100 file_loop->PostTask(FROM_HERE, new LoadImageTask(this, path, | |
| 101 posted_count_++)); | |
| 102 } | |
| 103 | |
| 104 void ImageLoadingTracker::OnImageLoaded(SkBitmap* image, size_t index) { | |
| 105 if (image == NULL) { | |
| 106 NOTREACHED() << "Image failed to decode."; | |
| 107 image = new SkBitmap(); | |
| 108 } | |
| 109 if (observer_) | |
| 110 observer_->OnImageLoaded(image, index); | |
| 111 delete image; | |
| 112 if (--image_count_ == 0) | |
| 113 Release(); // We are no longer needed. | |
| 114 } | |
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Issue 256022:
Loads local resources from current locale subtree if available, if not it fal... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/