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L_CylindricalBitmap

Summary

Warps the bitmap around a cylinder.

Syntax

#include "l_bitmap.h"

L_LTIMGSFX_API L_INT L_CylindricalBitmap (pBitmap, nValue, uType, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap on which to apply the effect.

L_INT nValue

Amount of stretching where,

Positive values, stretch the pixels toward the bitmap edges depending on the type of cylinder.
Negative values, stretch the pixels toward the central line of the cylinder.

The valid range is from -100 to 100.

L_UINT uType

A value that indicates the cylinder shape. Possible values are:

Value	Meaning
CYL_HORZ	[0x0000] Stretch the pixels along the vertical plane (horizontal cylinder).
CYL_VERT	[0x0001] Stretch the pixels along the horizontal plane (vertical cylinder).

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 the bitmap has a region, the effect will be applied only to the region.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in the Document and Medical Imaging toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Cylinder Function - Before

Cylinder Function - After

View additional platform support for this Cylinder function.

Required DLLs and Libraries

LTIMGSFX
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

L_INT CylindricalBitmapExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
 
   /* Load a bitmap at its own bits per pixel  */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("sample5.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Warp the image to horizontal cylinder shape*/ 
   nRet = L_CylindricalBitmap(&LeadBitmap, 100, CYL_HORZ, 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; 
 
   //free bitmap 
   if (LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap); 
 
   return SUCCESS; 
}