L_ConvertFromWMF

#include "l_bitmap.h"

L_LTDIS_API L_INT L_ConvertFromWMF(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_HMETAFILE hWmf;	/* handle to the WMF to be converted */
L_UINT uWidth;	/* width */
L_UINT uHeight;	/* height */

Converts a Windows metafile (WMF) into a LEAD Technologies bitmap. When this function is completed, there are two copies of the drawing in memory: the WMF and the original LEAD vector. Freeing one will not affect the other.

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

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

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

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

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

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

Required DLLs and Libraries

LTKRN

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_ChangeFromEMF, L_ChangeFromWMF
	L_ChangeToEMF, L_ChangeToWMF,
	L_ConvertFromEMF, L_ConvertToWMF,
	L_ConvertToEMF

Example

This example loads a bitmap, converts it to a WMF, then converts the WMF back to a bitmap.

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


 L_INT ConvertFromWMFExample(pBITMAPHANDLE  pLeadBitmap)
{
   L_INT nRet;
   BITMAPHANDLE   Bitmap;    /* Bitmap handle for the initial image */
   HMETAFILE      hWmf;

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

   /* Convert the initial bitmap to a WMF */
   hWmf  = L_ConvertToWMF( &Bitmap );

   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &Bitmap, FILE_BMP, 24, 0, NULL);
   if(nRet != SUCCESS)
      return nRet;

   /* Free the initial bitmap */
   if(Bitmap.Flags.Allocated)  
      L_FreeBitmap(&Bitmap);

   /* Convert the WMF to create a new LEAD bitmap and preserve the size */
   if(pLeadBitmap->Flags.Allocated)
      L_FreeBitmap(pLeadBitmap);
   nRet = L_ConvertFromWMF(pLeadBitmap, sizeof(BITMAPHANDLE), hWmf, 0, 0);
   if(nRet != SUCCESS)
      return nRet;

   /* Clean up */
   DeleteMetaFile(hWmf);
   return SUCCESS;
}