lyfz_repos/经典版源码/lyfzClient/trunk/3.0.0.0/include/imagefile/ImageHandle_IPicture.h

/*
 *   Copyright (C) =USTC= Fu Li
 *
 *   Author   :  Fu Li
 *   Create   :  2005-9-12
 *   Home     :  http://www.crazy-bit.com/
 *   Mail     :  crazybit@263.net
 *   History  :  
 */
#ifndef __FOO_IMAGE_HANDLE_IPICTURE__2005_09_12__H__
#define __FOO_IMAGE_HANDLE_IPICTURE__2005_09_12__H__
#include "../ObjImage.h"
#include <ocidl.h>

//class FCImageHandle ;
    class FCImageHandle_IPicture ;

//=============================================================================
/**
 *  Use windows IPicture interface to read JPG/GIF image.
 */
class FCImageHandle_IPicture : public FCImageHandleBase
{
    /// Read image via IPicture interface.
    virtual bool LoadImageMemory (const BYTE* pStart, int nMemSize,
                                  PCL_Interface_Composite<FCObjImage>& rImageList,
                                  std::auto_ptr<FCImageProperty>& rImageProp)
    {
		if (!pStart || (nMemSize <= 0))
			return false ;

		HGLOBAL   hBuffer = ::GlobalAlloc (GMEM_MOVEABLE, nMemSize) ;

		// copy buffer to HGLOBAL
		::CopyMemory (::GlobalLock(hBuffer), pStart, nMemSize) ;
		::GlobalUnlock (hBuffer) ;

		IStream     * pStream = NULL ;
		IPicture    * pIPic = NULL ;
		FCObjImage  * pImg = new FCObjImage ;
		if (::CreateStreamOnHGlobal (hBuffer, TRUE, &pStream) == S_OK)
		{
			if (::OleLoadPicture (pStream, nMemSize, FALSE, IID_IPicture, (LPVOID*)&pIPic) == S_OK)
			{
				OLE_HANDLE   hDDB ;
				pIPic->get_Handle (&hDDB) ;

				BITMAP       bm ;
				GetObject ((HGDIOBJ)hDDB, sizeof(BITMAP), &bm) ;
				if (pImg->Create (bm.bmWidth, bm.bmHeight, 24))
				{
					// dest format
					PCL_array<BITMAPINFO>   bmfh (pImg->NewImgInfoWithPalette()) ;
					HDC     hdc = ::GetDC(NULL) ;
					::GetDIBits (hdc, (HBITMAP)hDDB, 0, bm.bmHeight, pImg->GetMemStart(), bmfh.get(), DIB_RGB_COLORS) ;
					::ReleaseDC (NULL, hdc) ;
				}
				pIPic->Release() ;
			}
			pStream->Release() ;
		}

		if (!pImg->IsValidImage())
		{
			delete pImg ;
            return false ;
        }

        // add to list
        rImageList.PCL_PushObject (pImg) ;
        return true ;
	}
};

//=============================================================================
// inline Implement
//=============================================================================

#endif