L_ShiftBitmapData

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_ShiftBitmapData(pDstBitmap, pSrcBitmap, uSrcLowBit, uSrcHighBit, uDstLowBit, uDstBitsPerPixel, uFlags)

Selects a specified number of bits from an 8, 12 or 16-bit grayscale bitmap into a mask and places the mask in a new 8, 12 or 16-bit grayscale bitmap. This function is available in the Document and Medical Imaging toolkits.

Parameters

pBITMAPHANDLE pDstBitmap

Pointer to the destination bitmap that will contain the result of the function. The user should free the bitmap before passing it to the function.

pBITMAPHANDLE pSrcBitmap

Pointer to the source bitmap handle referencing the 8, 12 or 16-bit grayscale bitmap. pSrcBitmap will not be affected.

L_UINT uSrcLowBit

Position of the start bit that will construct the mask. The position is a zero-based number.

L_UINT uSrcHighBit

Position of the end bit. This is inclusive (it is part of the mask). The value should not be less than uSrcLowBit. You can also pass 1, which is interpreted as "highest bit" (pSrcBitmap->BitsPerPixel 1).

L_UINT uDstLowBit

The bit position where the selected mask will be copied into the pDstBitmap.

L_UINT uDstBitsPerPixel

Bits per pixel for the destination bitmap. The allowed values are 8, 12, or 16

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

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

Comments

This function can process the whole image or a region of the image. If a bitmap has a region, the effect is applied only to the region.

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

Platforms

Win32, x64, Linux.

See Also

Functions

Topics

Example

This example loads a bitmap and applies Shifting.

L_INT ShiftBitmapDataExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */ 
   BITMAPHANDLE DstBitmap;     /* Bitmap handle to hold the result. */ 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("Slice.tif")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL);  
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Move 5 bits starting from bit 2 into the high bits of the destination bitmap */ 
   nRet = L_ShiftBitmapData (&DstBitmap, &LeadBitmap, 
                             2 /* uSrcLowBit */,  
                             6 /* uSrcHighBit*/,  
                             3 /* uDstLowBit */,  
                             8 /* uDstBitsPerPixel */ , 0);  
   if(nRet !=SUCCESS) 
      return nRet; 
 
   // Now we have the resulting image in DstBitmap 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &DstBitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   if(DstBitmap.Flags.Allocated) 
      L_FreeBitmap(&DstBitmap);   
   //free bitmap  
   if(LeadBitmap.Flags.Allocated)   
      L_FreeBitmap(&LeadBitmap);   
   return SUCCESS; 
} 

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