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

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; 
} 
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