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Unified Diff: chrome/browser/extensions/extension_icon_image.h

Issue 10825012: chromeos: Fix pixelated icons in app list and launcher (part 2) (by xiyuan) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: . Created 8 years, 4 months ago
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Index: chrome/browser/extensions/extension_icon_image.h
diff --git a/chrome/browser/extensions/extension_icon_image.h b/chrome/browser/extensions/extension_icon_image.h
new file mode 100644
index 0000000000000000000000000000000000000000..c2f98526e4224985aa7fdbe983876f76b9af956e
--- /dev/null
+++ b/chrome/browser/extensions/extension_icon_image.h
@@ -0,0 +1,98 @@
+// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "chrome/browser/extensions/image_loading_tracker.h"
+#include "chrome/common/extensions/extension_icon_set.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace extensions {
+class Extension;
+}
+
+namespace gfx {
+class Size;
+}
+
+namespace extensions {
+
+// A class that provides an ImageSkia for UI code to use. It handles extension
+// icon resource loading, screen scale factor change etc. UI code that uses
+// extension icon should host this class and be its observer. ExtensionIconImage
+// should be outlived by the observer. In painting code, UI code paints with the
+// ImageSkia provided by this class. If required extension icon resource is not
+// present, this class uses ImageLoadingTracker to load it and call on its
+// observer interface when the resource is loaded.
+class IconImage : public ImageLoadingTracker::Observer,
+ public content::NotificationObserver {
+ public:
+ class Observer {
+ public:
+ // Invoked when a new image rep for an additional scale factor
+ // is loaded and added to |image|.
+ virtual void OnExtensionIconImageChanged(IconImage* image) = 0;
+
+ // Invoked when the icon image couldn't be loaded.
+ virtual void OnIconImageLoadFailed(IconImage* image,
+ ui::ScaleFactor scale_factor) = 0;
+
+ protected:
+ virtual ~Observer() {}
+ };
+
+ IconImage(const Extension* extension,
+ const ExtensionIconSet& icon_set,
+ int resource_size_in_dip,
+ Observer* observer);
+ virtual ~IconImage();
+
+ const gfx::ImageSkia& image_skia() const { return image_skia_; }
+
+ private:
+ class Source;
+
+ typedef std::map<int, ui::ScaleFactor> LoadMap;
+
+ // Loads bitmap for additional scale factor.
+ void LoadImageForScaleFactor(ui::ScaleFactor scale_factor);
+
+ // ImageLoadingTracker::Observer overrides:
+ virtual void OnImageLoaded(const gfx::Image& image,
+ const std::string& extension_id,
+ int index) OVERRIDE;
+
+ // content::NotificationObserver overrides:
+ virtual void Observe(int type,
+ const content::NotificationSource& source,
+ const content::NotificationDetails& details) OVERRIDE;
+
+ const Extension* extension_;
+ const ExtensionIconSet& icon_set_;
+ const int resource_size_in_dip_;
+ const gfx::Size desired_size_in_dip_;
+
+ Observer* observer_;
+
+ Source* source_; // Owned by ImageSkia storage.
+ gfx::ImageSkia image_skia_;
+
+ ImageLoadingTracker tracker_;
+ content::NotificationRegistrar registrar_;
+
+ LoadMap load_map_;
+
+ DISALLOW_COPY_AND_ASSIGN(IconImage);
+};
+
+} // namespace extensions
+
+#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_
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