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L_ConvertFromEMF

Summary

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

Syntax

#include "l_bitmap.h"

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

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap to be updated with the converted 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 converted.

L_UINT uWidth

Amount by which to scale the metafiles original width.

L_UINT uHeight

Amount by which to scale the 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.

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

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.

Example

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

L_INT ConvertFromEMFExample(pBITMAPHANDLE pLeadBitmap) 
{ 
   L_INT nRet; 
   BITMAPHANDLE Bitmap;    /* Bitmap 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")), &Bitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Convert the initial bitmap to a EMF */ 
   hEMF = L_ConvertToEMF( &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 EMF to create a new LEAD bitmap and preserve the size */ 
   if(pLeadBitmap->Flags.Allocated) 
      L_FreeBitmap(pLeadBitmap); 
   L_ConvertFromEMF(pLeadBitmap, sizeof(BITMAPHANDLE), hEMF, 0, 0); 
 
   /* Clean up */ 
   DeleteEnhMetaFile(hEMF); 
   return SUCCESS; 
}