#include "l_bitmap.h"

L_LTIMGSFX_API L_INT L_BendingBitmap(pBitmap, nValue, CenterPt, crFill, uFlags)

Warps the active bitmap along a curved plane, centered on the pivot point.



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 edges, and negative values stretch the pixels toward the center. Possible values are range in between -500 and 500.

POINT CenterPt

A POINT structure that contains the center of the arc. This is ignored when either BND_HORZ or BND_VERT is set in the uFlags parameter.


The COLORREF value that specifies the fill color for any exposed areas. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.

L_UINT uFlags

Flags that indicate how to handle peripherally exposed areas, how to handle centrally exposed areas and the type of bending. You can use a bitwise OR (|) to specify one flag from each group.

Value Meaning
How to handle peripherally exposed areas:
FILL_CLR [0x0000] Fill any exposed areas with crFill.
FILL_RPT [0x0001] Stretch the image edges to fill the exposed area.
FILL_NOCHG [0x0002] Leave the exposed area as is, without changing it.
How to handle an exposed center:
FILL_ROT [0x0000] Rotate the image inside the arc pattern.
FILL_WOUTROT [0x0010] Fill the exposed center as you would any other exposed area. This is determined by setting the FILL_CLR, FILL_RPT or FILL_NOCHG flags.
This flag is ignored if the nValue is negative.
How the bitmap is bent:
BND_NORM [0x0000] Stretch the image along the vertical and horizontal planes.
BND_HORZ [0x0100] Stretch the image along the horizontal plane.
BND_VERT [0x0200] Stretch the image along the vertical plane.


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


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.

The function bends the image around the specified CenterPt. The center point must be defined inside the bitmap or inside the region, if the bitmap has a region. If the bitmap has a region, the effect will be applied on the region only.

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.

Required DLLs and Libraries


Win32, x64.

See Also




L_INT BendingBitmapExample(L_VOID) 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
   POINT CenterPt; 
   /* Load a bitmap at its own bits per pixel */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("sample5.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   /* bend the image around it is center */ 
   CenterPt.x  =  LeadBitmap.Width/2; 
   CenterPt.y  =  LeadBitmap. Height/2; 
   nRet = L_BendingBitmap (&LeadBitmap, 100, CenterPt, 0, FILL_RPT | FILL_WOUTROT | BND_NORM); 
   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  
   return SUCCESS; 
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