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L_RotateBitmapViewPerspective

#include "l_bitmap.h"

L_LTKRN_API L_INT L_RotateBitmapViewPerspective(pBitmap, nAngle)

Rotates an image by changing the bitmap's view perspective.

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle.

L_INT nAngle

Degrees of rotation. Valid values +-90, +-180, +-270, or +-360. Positive values are clockwise; negative values are counterclockwise.

Returns

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

Comments

This function achieves fast rotation by changing only the view perspective. After using this function, you can reverse the result by restoring the original View Perspective.

Some functions must account for the view perspective. For general information about view perspectives, refer to Accounting for View Perspective.

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, Linux.

Functions

Topics

Raster Image Functions: Doing Geometric Transformations

Example

L_INT RotateBitmapViewPerspectiveExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap; 
 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   nRet = L_RotateBitmapViewPerspective ( &LeadBitmap, 90 ); 
   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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