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L_ChangeFromEMF

Summary

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

Syntax

#include "l_bitmap.h"

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

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap to be updated with the changed file.

L_UINT uStructSize

Size in bytes, of the structure pointed to by pBitmap, for versioning. Use sizeof(BITMAPHANDLE).

L_HENHMETAFILE hWmf

Handle to the EMF to be changed.

L_UINT uWidth

Amount by which to scale the enhanced metafiles original width.

L_UINT uHeight

Amount by which to scale the enhanced metafiles original height.

Returns

Value	Meaning
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.

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

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; 
}