Source/WebCore/platform/PlatformInstrumentation.h

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef PlatformInstrumentation_h
#define PlatformInstrumentation_h

#include <wtf/MainThread.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

class PlatformInstrumentationClient {
public:
    virtual ~PlatformInstrumentationClient();

    virtual void willDecodeImage(const String& imageType) = 0;
    virtual void didDecodeImage() = 0;
    virtual void willResizeImage(bool shouldCache) = 0;
    virtual void didResizeImage() = 0;
};

class PlatformInstrumentation {
public:
    static const char ImageDecodeEvent[];
    static const char ImageResizeEvent[];

    static const char ImageTypeArgument[];
    static const char CachedArgument[];

    static void setClient(PlatformInstrumentationClient*);
    static bool hasClient() { return m_client; }

    static void willDecodeImage(const String& imageType);
    static void didDecodeImage();
    static void willResizeImage(bool shouldCache);
    static void didResizeImage();

private:
    static const char CategoryName[];

    static PlatformInstrumentationClient* m_client;
};

#define FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD() if (!m_client || !isMainThread()) return;

inline void PlatformInstrumentation::willDecodeImage(const String& imageType)
{
    FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD();
    m_client->willDecodeImage(imageType);
}

inline void PlatformInstrumentation::didDecodeImage()
{
    FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD();
    m_client->didDecodeImage();
}

inline void PlatformInstrumentation::willResizeImage(bool shouldCache)
{
    FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD();
    m_client->willResizeImage(shouldCache);
}

inline void PlatformInstrumentation::didResizeImage()
{
    FAST_RETURN_IF_NO_CLIENT_OR_NOT_MAIN_THREAD();
    m_client->didResizeImage();
}

} // namespace WebCore

#endif // PlatformInstrumentation_h