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L_ChangeFromWMF

#include "l_bitmap.h"

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

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

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_HMETAFILE hWmf

Handle to the WMF to be changed.

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.

If this function is successful, hWmf is freed.

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

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.

Functions

Example

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

L_INT ChangeFromWMFExample() 
{ 
   L_INT nRet; 
   BITMAPHANDLE   LeadBitmap;    /* 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")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /* Convert the initial bitmap to a WMF */ 
   hWmf = L_ChangeToWMF( &LeadBitmap); 
 
   /* Convert the WMF to create a new LEAD bitmap and preserve the size */ 
   nRet = L_ChangeFromWMF(&LeadBitmap, sizeof(BITMAPHANDLE), hWmf, 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; 
}

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