WebCore/platform/DragImage.h

/*
 * Copyright (C) 2007 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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 distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef DragImage_h
#define DragImage_h

#include "IntSize.h"
#include "FloatSize.h"

#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#ifdef __OBJC__
@class NSImage;
#else
class NSImage;
#endif
#elif PLATFORM(QT)
class QImage;
#elif PLATFORM(WIN)
typedef struct HBITMAP__* HBITMAP;
#endif

//We need to #define YOffset as it needs to be shared with WebKit
#define DragLabelBorderYOffset 2

namespace WebCore {
    
    class CachedImage;
    class Frame;
    class Image;
    class KURL;
    class Range;
    class String;
    
#if PLATFORM(MAC)
    typedef RetainPtr<NSImage> DragImageRef;
#elif PLATFORM(QT)
    typedef QImage* DragImageRef;
#elif PLATFORM(WIN)
    typedef HBITMAP DragImageRef;
#elif PLATFORM(GDK)
    typedef void* DragImageRef;
#endif
    
    IntSize dragImageSize(DragImageRef);
    
    //These functions should be memory neutral, eg. if they return a newly allocated image, 
    //they should release the input image.  As a corollary these methods don't guarantee
    //the input image ref will still be valid after they have been called
    DragImageRef fitDragImageToMaxSize(DragImageRef image, const IntSize& srcSize, const IntSize& size);
    DragImageRef scaleDragImage(DragImageRef, FloatSize scale);
    DragImageRef dissolveDragImageToFraction(DragImageRef image, float delta);
    
    DragImageRef createDragImageFromImage(Image*);
    DragImageRef createDragImageForSelection(Frame*);    
    DragImageRef createDragImageIconForCachedImage(CachedImage*);
    void deleteDragImage(DragImageRef);
}


#endif //!DragImage_h