third_party/WebKit/Source/platform/PlatformInstrumentation.h

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * in the documentation and/or other materials provided with the
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#ifndef PlatformInstrumentation_h
#define PlatformInstrumentation_h

#include "platform/PlatformExport.h"
#include "platform/TraceEvent.h"
#include "wtf/text/WTFString.h"

namespace blink {

class PLATFORM_EXPORT PlatformInstrumentation {
public:
    class LazyPixelRefTracker: TraceEvent::TraceScopedTrackableObject<void*> {
    public:
        LazyPixelRefTracker(void* instance)
            : TraceEvent::TraceScopedTrackableObject<void*>(CategoryName, LazyPixelRef, instance)
        {
        }
    };

    static const char ImageDecodeEvent[];
    static const char ImageResizeEvent[];
    static const char DrawLazyPixelRefEvent[];
    static const char DecodeLazyPixelRefEvent[];

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

    static const char LazyPixelRef[];

    static void willDecodeImage(const String& imageType);
    static void didDecodeImage();
    static void didDrawLazyPixelRef(unsigned long long lazyPixelRefId);
    static void willDecodeLazyPixelRef(unsigned long long lazyPixelRefId);
    static void didDecodeLazyPixelRef();

private:
    static const char CategoryName[];
};

inline void PlatformInstrumentation::willDecodeImage(const String& imageType)
{
    TRACE_EVENT_BEGIN1(CategoryName, ImageDecodeEvent, ImageTypeArgument, imageType.ascii());
}

inline void PlatformInstrumentation::didDecodeImage()
{
    TRACE_EVENT_END0(CategoryName, ImageDecodeEvent);
}

inline void PlatformInstrumentation::didDrawLazyPixelRef(unsigned long long lazyPixelRefId)
{
    TRACE_EVENT_INSTANT1(CategoryName, DrawLazyPixelRefEvent, TRACE_EVENT_SCOPE_THREAD, LazyPixelRef, lazyPixelRefId);
}

inline void PlatformInstrumentation::willDecodeLazyPixelRef(unsigned long long lazyPixelRefId)
{
    TRACE_EVENT_BEGIN1(CategoryName, DecodeLazyPixelRefEvent, LazyPixelRef, lazyPixelRefId);
}

inline void PlatformInstrumentation::didDecodeLazyPixelRef()
{
    TRACE_EVENT_END0(CategoryName, DecodeLazyPixelRefEvent);
}

} // namespace blink

#endif // PlatformInstrumentation_h