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L_OffsetBitmap

Summary

Shifts the bitmap pixels horizontally and vertically.

Syntax

#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_OffsetBitmap(pBitmap, nHorizontalShift, nVerticalShift, crBackColor, uFlags)

Parameters

pBITMAPHANDLE pBitmap

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

L_INT nHorizontalShift

Horizontal shift of the bitmap, in pixels.

L_INT nVerticalShift

Vertical shift of the bitmap, in pixels.

COLORREF crBackColor

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. This is only useful when uFlags parameter is set to FILL_CLR.

L_UINT uFlags

Flag that indicates how to handle any exposed areas resulting from the bitmap shift. Possible values are:

Value	Meaning
FILL_CLR	[0x0000] Fill the exposed areas with `crBackColor`.
FILL_RPT	[0x0001] Stretch the image edges to fill the exposed area.
FILL_NOCHG	[0x0002] Leave the exposed area as is, without changing it.
FILL_WRAP	[0x0003] Fill any exposed areas with the opposite side of the image.

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.

This function shifts the bitmap pixels horizontally and vertically.

Use the L_OffsetBitmapRgn function to move a bitmap region by the specified number of rows and columns.

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.

Offset Function - Before

Offset Function - After

View additional platform support for this Offset function.

Required DLLs and Libraries

LTIMGEFX
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.

Example

L_INT OffsetBitmapExample(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("NaturalFruits.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Apply the Offset Bitmap effect to the image*/ 
   nRet = L_OffsetBitmap(&LeadBitmap, LeadBitmap.Width / 2, LeadBitmap.Height / 2, RGB(0, 0, 0), FILL_WRAP); 
   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; 
}