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// 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_UI_WEBUI_EXTENSIONS_EXTENSION_ICON_SOURCE_H_
#define CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_ICON_SOURCE_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/favicon/favicon_service.h"
#include "chrome/common/cancelable_task_tracker.h"
#include "chrome/common/extensions/extension_icon_set.h"
#include "content/public/browser/url_data_source.h"
#include "extensions/common/extension_resource.h"
#include "third_party/skia/include/core/SkBitmap.h"
class ExtensionIconSet;
class Profile;
namespace extensions {
class Extension;
// ExtensionIconSource serves extension icons through network level chrome:
// requests. Icons can be retrieved for any installed extension or app.
//
// The format for requesting an icon is as follows:
// chrome://extension-icon/<extension_id>/<icon_size>/<match_type>?[options]
//
// Parameters (<> required, [] optional):
// <extension_id> = the id of the extension
// <icon_size> = the size of the icon, as the integer value of the
// corresponding Extension:Icons enum.
// <match_type> = the fallback matching policy, as the integer value of
// the corresponding ExtensionIconSet::MatchType enum.
// [options] = Optional transformations to apply. Supported options:
// grayscale=true to desaturate the image.
//
// Examples:
// chrome-extension://gbmgkahjioeacddebbnengilkgbkhodg/32/1?grayscale=true
// (ICON_SMALL, MATCH_BIGGER, grayscale)
// chrome-extension://gbmgkahjioeacddebbnengilkgbkhodg/128/0
// (ICON_LARGE, MATCH_EXACTLY)
//
// We attempt to load icons from the following sources in order:
// 1) The icons as listed in the extension / app manifests.
// 2) If a 16px icon was requested, the favicon for extension's launch URL.
// 3) The default extension / application icon if there are still no matches.
//
class ExtensionIconSource : public content::URLDataSource,
public base::SupportsWeakPtr<ExtensionIconSource> {
public:
explicit ExtensionIconSource(Profile* profile);
// Gets the URL of the |extension| icon in the given |icon_size|, falling back
// based on the |match| type. If |grayscale|, the URL will be for the
// desaturated version of the icon. |exists|, if non-NULL, will be set to true
// if the icon exists; false if it will lead to a default or not-present
// image.
static GURL GetIconURL(const Extension* extension,
int icon_size,
ExtensionIconSet::MatchType match,
bool grayscale,
bool* exists);
// A public utility function for accessing the bitmap of the image specified
// by |resource_id|.
static SkBitmap* LoadImageByResourceId(int resource_id);
// content::URLDataSource implementation.
virtual std::string GetSource() const OVERRIDE;
virtual std::string GetMimeType(const std::string&) const OVERRIDE;
virtual void StartDataRequest(
const std::string& path,
int render_process_id,
int render_view_id,
const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
private:
// Encapsulates the request parameters for |request_id|.
struct ExtensionIconRequest;
virtual ~ExtensionIconSource();
// Loads the extension's icon for the given |request_id| and returns the
// image to the client.
void LoadExtensionImage(int request_id);
// LoadExtensionImage() will load the icon using
// ImageLoader::LoadExtensionIconAsync(). OnIconLoaded will be called when
// the icon has been loaded.
void OnIconLoaded(int request_id, const gfx::Image& image);
// Parses and savse an ExtensionIconRequest for the URL |path| for the
// specified |request_id|.
bool ParseData(const std::string& path,
int request_id,
const content::URLDataSource::GotDataCallback& callback);
// Stores the parameters associated with the |request_id|, making them
// as an ExtensionIconRequest via GetData.
void SetData(int request_id,
const content::URLDataSource::GotDataCallback& callback,
const Extension* extension,
bool grayscale,
int size,
ExtensionIconSet::MatchType match);
// Returns the ExtensionIconRequest for the given |request_id|.
ExtensionIconRequest* GetData(int request_id);
// Removes temporary data associated with |request_id|.
void ClearData(int request_id);
Profile* profile_;
// Maps request_ids to ExtensionIconRequests.
std::map<int, ExtensionIconRequest*> request_map_;
DISALLOW_COPY_AND_ASSIGN(ExtensionIconSource);
};
} // namespace extensions
#endif // CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_ICON_SOURCE_H_
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