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/* Things To Do 11/8/00

Check image metrics, can we support them? Do we need to?
Any other render format? HTML?

*/

#include "nserror.h"
#include <windows.h>

#include "nsCOMPtr.h"
#include "nsIImage.h"


//
// nsImageToClipboard
//
// A utility class that takes an nsIImage and does all the bitmap magic
// to allow us to put it on the clipboard
//
class nsImageToClipboard
{
public:
  nsImageToClipboard ( nsIImage* inImage );
  ~nsImageToClipboard();

    // Call to get the actual bits that go on the clipboard. If |nsnull|, the
    // setup operations have failed.
    //
    // NOTE: The caller owns the handle and must delete it with ::GlobalRelease()
  nsresult GetPicture ( HANDLE* outBits ) ;

private:

    // Computes # of bytes needed by a bitmap with the specified attributes.
  PRInt32 CalcSize(PRInt32 aHeight, PRInt32 aColors, WORD aBitsPerPixel, PRInt32 aSpanBytes);
  PRInt32 CalcSpanLength(PRUint32 aWidth, PRUint32 aBitCount);

    // Do the work
  nsresult CreateFromImage ( nsIImage* inImage, HANDLE* outBitmap );

  nsCOMPtr<nsIImage> mImage;            // the image we're working with

}; // class nsImageToClipboard


//
// nsImageFromClipboard
//
// A utility class that takes a DIB from the win32 clipboard and does
// all the bitmap magic to create a nsIImage
//
class nsImageFromClipboard
{
public:
  nsImageFromClipboard ( BITMAPV4HEADER* inHeader ) ;
  ~nsImageFromClipboard ( ) ;
  
    // Retrieve the newly created image
  nsresult GetImage ( nsIImage** outImage ) ;
  
private:

  PRUint8* GetDIBBits ( ) ;

  BITMAPV4HEADER* mHeader;

}; // nsImageFromClipboard