L_ChangeFromEMF

#include "l_bitmap.h"

L_LTDIS_API L_INT L_ChangeFromEMF(pBitmap, uStructSize, hWmf, uWidth, uHeight)

pBITMAPHANDLE pBitmap;	/* pointer to a bitmap */
L_UINT uStructSize;	/* size in bytes, of the structure pointed to by pBitmap */
L_HENHMETAFILE hWmf;	/* handle to the EMF to be changed */
L_UINT uWidth;	/* width */
L_UINT uHeight;	/* height */

Changes a Windows enhanced metafile (EMF) into a LEAD Technologies bitmap and, if successful, frees the enhanced metafile.

Parameter	Description
pBitmap	Pointer to the bitmap to be updated with the changed file.
uStructSize	Size in bytes, of the structure pointed to by pBitmap, for versioning. Use sizeof(BITMAPHANDLE).
hWmf	Handle to the EMF to be changed.
uWidth	Amount by which to scale the enhanced metafiles original width.
uHeight	Amount by which to scale the enhanced metafiles original height.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

If this function is successful, hWmf is freed.

The enhanced metafile can be loaded at the original dimension or scaled by using the uWidth and uHeight parameters.

If uWidth == 0 and uHeight == 0 - the enhanced metafile is loaded at the size present in the file

If uWidth == 0 and uHeight > 0 - the enhanced metafile is stretched so that it has the height uHeight (preserving the aspect ratio)

If uWidth > 0 and uHeight == 0 - the enhanced metafile is stretched so that it has the width uWidth (preserving the aspect ratio)

If uWidth > 0 and uHeight > 0 - the enhanced metafile is stretched so that it has the width uWidth and height uHeight (the aspect ratio is ignored)

Required DLLs and Libraries

LTDIS

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:	L_ChangeToEMF, L_ChangeFromWMF,
	L_ChangeToWMF, L_ConvertFromEMF,
	L_ConvertFromWMF, L_ConvertToWMF,
	L_ConvertToEMF

Example

This example loads a bitmap, converts it to a EMF, then converts the EMF back to a bitmap Note that in this example, we didn't have to free the bitmap and the metafile, like we did in ChangeEMFToLead

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


 L_INT ChangeFromEMFExample()
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;    /* LeadBitmap handle for the initial image */
   HENHMETAFILE   hEMF;

   /* Load a bitmap, keeping its own bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
   if(nRet != SUCCESS)
      return nRet;

   /* Convert the initial bitmap to a EMF */
   hEMF = L_ChangeToEMF( &LeadBitmap );

   /* Convert the EMF to create a new LEAD bitmap and preserve the size */
   nRet = L_ChangeFromEMF(&LeadBitmap, sizeof(BITMAPHANDLE), hEMF, 0, 0);
   if(nRet != SUCCESS)
      return nRet;

   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet != SUCCESS)
      return nRet;
   if(LeadBitmap.Flags.Allocated)
      L_FreeBitmap(&LeadBitmap);  
   return SUCCESS;
}