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// Copyright (c) 2011 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_ICON_LOADER_H_
#define CHROME_BROWSER_ICON_LOADER_H_
#pragma once
#include "build/build_config.h"
#include <string>
#include "base/basictypes.h"
#include "base/message_loop_proxy.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "ui/gfx/image.h"
#if defined(TOOLKIT_USES_GTK)
#include "base/file_path.h"
#endif
#if defined(OS_WIN)
// On Windows, we group files by their extension, with several exceptions:
// .dll, .exe, .ico. See IconManager.h for explanation.
typedef std::wstring IconGroupID;
#elif defined(OS_POSIX)
// On POSIX, we group files by MIME type.
typedef std::string IconGroupID;
#endif
////////////////////////////////////////////////////////////////////////////////
//
// A facility to read a file containing an icon asynchronously in the IO
// thread. Returns the icon in the form of an SkBitmap.
//
////////////////////////////////////////////////////////////////////////////////
class IconLoader : public base::RefCountedThreadSafe<IconLoader> {
public:
enum IconSize {
SMALL = 0, // 16x16
NORMAL, // 32x32
LARGE
};
class Delegate {
public:
// Invoked when an icon has been read. |source| is the IconLoader. If the
// icon has been successfully loaded, result is non-null. This method must
// return true if it is taking ownership of the returned bitmap.
virtual bool OnImageLoaded(IconLoader* source, gfx::Image* result) = 0;
protected:
virtual ~Delegate() {}
};
IconLoader(const IconGroupID& group, IconSize size, Delegate* delegate);
// Start reading the icon on the file thread.
void Start();
private:
friend class base::RefCountedThreadSafe<IconLoader>;
virtual ~IconLoader();
void ReadIcon();
void NotifyDelegate();
// The message loop object of the thread in which we notify the delegate.
scoped_refptr<base::MessageLoopProxy> target_message_loop_;
IconGroupID group_;
IconSize icon_size_;
scoped_ptr<gfx::Image> image_;
Delegate* delegate_;
#if defined(TOOLKIT_USES_GTK)
// On X11 we use gdk's pixbuf loader, which has to execute on the UI
// thread, so we only read the file on the background thread and parse it
// on the main thread.
void ParseIcon();
FilePath filename_;
std::string icon_data_;
#endif
DISALLOW_COPY_AND_ASSIGN(IconLoader);
};
#endif // CHROME_BROWSER_ICON_LOADER_H_
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