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L_SelectBitmapData

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_SelectBitmapData (pDstBitmap, pSrcBitmap, crColor, uSrcLowBit, uSrcHighBit, uThreshold, bCombine, uFlags)

Selects a specified number of bits of an 8, 12 or 16-bit grayscale bitmap and puts them into a mask, then colors the bitmap depending on the mask. This can show bitmap variances depending on user-defined conditions.

Parameters

pBITMAPHANDLE pDstBitmap

Pointer to the destination bitmap that will contain the result of the function. This bitmap will be updated as a 24-bit RGB. The bitmap is assumed to be uninitialized, so you should free the bitmap before passing it to the function.

pBITMAPHANDLE pSrcBitmap

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

COLORREF crColor

Color that will be used for showing the variances in the bitmap.

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 that will construct the mask. 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 uThreshold

Value that indicates the threshold for showing the bitmap variances. If the mask value is greater or equal to the threshold value then the pixel will be colored using crColor. See bCombine for more details.

L_BOOL bCombine

A flag which tells how to color the output pixels:

Pixels with values greater than or equal to the threshold value are:

set to crColor (if bCombine is set to FALSE)

or

AND-ed with crColor (if bCombine is TRUE). In this case, the source pixel is first converted to grayscale 24-bit and then AND-ed with crColor.
Pixels with values less than the threshold value are:

set to black (if bCombine is set to FALSE)

or

The RGB pixel value will be the same as the high byte source pixel value (if bCombine is TRUE). That is R = G = B = High byte values of the source pixel.

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

LTIMGCOR
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

Example

This example loads a bitmap and applies Selecting.

L_INT SelectBitmapDataExample(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; 
 
   // Call the function 
   nRet =L_SelectBitmapData (&DstBitmap,  
                              &LeadBitmap, 
                              RGB(233, 10, 77),  
                              2 /* uSrcLowBit */, 
                              6 /* uSrcHighBit */, 
                              25 /* uThreshold */, 
                              TRUE, 0);   
   if(nRet !=SUCCESS) 
      return nRet; 
   // Now we have the resulted image in DstBitmap 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &DstBitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   //free bitmap  
   if(DstBitmap.Flags.Allocated) 
      L_FreeBitmap(&DstBitmap);  
   if(LeadBitmap.Flags.Allocated)   
      L_FreeBitmap(&LeadBitmap);   
   return SUCCESS; 
}

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