LBuffer::StartResize

#include "ltwrappr.h"

virtual L_INT LBuffer::StartResize(nOldWidth, nOldHeight, nNewWidth, nNewHeight)

L_INT nOldWidth;	/* original width of the image */
L_INT nOldHeight;	/* original height of the image */
L_INT nNewWidth;	/* new width for the image */
L_INT nNewHeight;	/* new height for the image */

Sets up information for the LBuffer::Resize function.

Parameter	Description
nOldWidth	The original width of the image.
nOldHeight	The original height of the image.
nNewWidth	The new width for the image.
nNewHeight	The new height for the image.

Returns

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

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:	Class Members
Topics:	Raster Image Functions: Doing Geometric Transformations
	Resizing Considerations

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LBuffer__StartResizeExample()
{
   L_INT nRet;
   LBitmapBase LeadBitmap,TmpBitmap;
   LBuffer       LeadBuffer;
   L_INT       nNewHeight;
   L_INT       nOldHeight;
   L_INT       nNewWidth;
   L_INT       nOldWidth;
   L_INT       i,n,nDestRow ;
   L_INT       CopyWidth, CopyHeight;
   nRet =TmpBitmap.Load (MAKE_IMAGE_PATH(TEXT("image1.cmp"))) ;
   if(nRet !=SUCCESS)
      return nRet;
   nOldHeight = TmpBitmap.GetHeight () ;
   nOldWidth  = TmpBitmap.GetWidth ();
   nNewHeight = nOldHeight * 2;
   nNewWidth  = nOldWidth  * 2;
   L_INT nBufferSize = max( TmpBitmap.GetBytesPerLine (), nNewWidth* 3);
   nRet =LeadBuffer.Reallocate (nBufferSize);
   if(nRet !=SUCCESS)
      return nRet;
   nRet =LeadBitmap.Create (nNewWidth, nNewHeight,24, TmpBitmap.GetColorOrder (), NULL, TYPE_CONV) ;
   if(nRet !=SUCCESS)
      return nRet;
   // Initialize the resize process
   nRet =LeadBuffer.StartResize(nOldWidth,nOldHeight,nNewWidth,nNewHeight);
   if(nRet !=SUCCESS)
      return nRet;
   // Initialize the destination row number
   nDestRow = 0;
   // Use Resize to process each row in the bitmap
   nRet =LeadBitmap.Access ();
   if(nRet !=SUCCESS)
      return nRet;
   nRet =TmpBitmap.Access ();
   if(nRet !=SUCCESS)
      return nRet;
   for(i=0; i < TmpBitmap.GetHeight (); i++)
   {
      nRet =(L_INT)TmpBitmap.GetRow (&LeadBuffer, i);
      if(nRet < 1)
         return nRet;
      nRet =LeadBuffer.Resize (i, TmpBitmap.GetBitsPerPixel (), &CopyWidth, &CopyHeight);
      if(nRet < 1)
         return nRet;
      // Output as many or as few rows as Resize supplies
      for(n=0; n < CopyHeight; n++)
      {
         nRet =(L_INT)LeadBitmap.PutRow (LeadBuffer, nDestRow);
         if(nRet < 1)
            return nRet;
         nDestRow++;
      }
   }
   nRet =LeadBitmap.Release ();
   if(nRet !=SUCCESS)
      return nRet;
   nRet =TmpBitmap.Release();
   if(nRet !=SUCCESS)
      return nRet;
   // End the resize process
   nRet =LeadBuffer.StopResize ();
   if(nRet !=SUCCESS)
      return nRet;
   return SUCCESS;
}