KKB::BmpImage::CodedPixels Class Reference

This object is used to help encode the data stored in BMPImage::image into 8 or 4 bit compressed formats used by BMP files. *. More...

Public Member Functions
	CodedPixels (kkint32 _height, kkint32 _width)
	~CodedPixels ()
void	AddPixel (uchar pixel)
uchar *	CreatePixelDataStructure4Bit (kkint32 &len)
uchar *	CreatePixelDataStructure8Bit (kkint32 &len)
void	EOL ()

Detailed Description

This object is used to help encode the data stored in BMPImage::image into 8 or 4 bit compressed formats used by BMP files. *.

Definition at line 163 of file BMPImage.cpp.

Constructor & Destructor Documentation

KKB::BmpImage::CodedPixels::CodedPixels	(	kkint32	_height,
		kkint32	_width
	)

Definition at line 200 of file BMPImage.cpp.

                                    :
  height (_height),
  width  (_width),
  top (NULL)
{
  codesAllocated = height * (width + 4);
  used = 0;

  codes = new CodePair[codesAllocated];
}

KKB::BmpImage::CodedPixels::~CodedPixels

(

)

Definition at line 215 of file BMPImage.cpp.

{
  delete codes;
}

Member Function Documentation

void KKB::BmpImage::CodedPixels::AddPixel

(

uchar

pixel

)

This method is called once for each pixel in the BMP image

Definition at line 223 of file BMPImage.cpp.

References KKB::BmpImage::CodePair::count, and KKB::BmpImage::CodePair::pixel.

Referenced by KKB::BmpImage::SaveGrayscaleInverted4Bit(), and KKB::BmpImage::SaveGrayscaleInverted8Bit().

{
  if  (used >= codesAllocated)
  {
    // We are exceeding the codes Size.
    cerr << "CodedPixels::AddPixel *** Error ***, Exceeding  codesAllocated." << std::endl;
    return;
  }

  if  (!top)
  {
    top = &(codes[0]);
    used++;
    top->count = 1;
    top->pixel = pixel;
  }

  else if  ((pixel != top->pixel)  ||  (top->count == 0))
  {
    used++;
    top++;
    top->count = 1;
    top->pixel = pixel;
  }

  else 
  {
    if  (top->count >= 254)
    {
      used++;
      top++;
      top->count = 1;
      top->pixel = pixel;
    }
    else
    {
      top->count++;
    }
  }
}  /* AddPixel */

uchar * KKB::BmpImage::CodedPixels::CreatePixelDataStructure4Bit

(

kkint32 &

len

)

Creates the appropriate compressed data structure for the BMP 4-bit compressed file format. The length of the structure created will be returned in the 'len' parameter. The caller will be responsible for deleting the returned data structure.

Definition at line 277 of file BMPImage.cpp.

References KKB::BmpImage::CodePair::count, and KKB::BmpImage::CodePair::pixel.

Referenced by KKB::BmpImage::SaveGrayscaleInverted4Bit().

{
  kkint32  buffSize = codesAllocated;

  uchar* buff = new uchar [buffSize + 4];  // + 4 For Safety
  memset (buff, 0, codesAllocated);


  kkint32  curPair = 0;
  top = &(codes[0]);

  kkint32  bp = 0;

  while  (curPair < used)
  {
    if  (bp >= buffSize)
    {
      kkint32  newBuffSize = buffSize * 2;
      uchar* newBuff = new uchar[newBuffSize];
      memset (newBuff, 0, newBuffSize);
      memcpy (newBuff, buff, buffSize);
      delete[] buff;
      buff = newBuff;
      newBuff = NULL;
      buffSize = newBuffSize;
    }


    {
      if  ((top->count == 0)  &&  (top->pixel == 0))
      {
        // Add End Of Line 
        buff[bp] = 0;
        bp++;
        buff[bp] = 0;
        bp++;

        curPair++;
        top++;
      }

      else
      {
        if  (top->count > 254)
        {
          buff[bp] = 254;
          bp++;

          buff[bp] = top->pixel * 16 + top->pixel;
          bp++;

          top->count = top->count - 254;
        }

        else
        {
          buff[bp] = top->count;
          bp++;

          buff[bp] = top->pixel * 16 + top->pixel;
          bp++;

          curPair++;
          top++;
        }
      }
    }
  }

  buff[bp] = 0;
  bp++;

  buff[bp] = 1;
  bp++;

  len = bp;     
  return  buff;
} /* CreatePixelDataStructure */

uchar * KKB::BmpImage::CodedPixels::CreatePixelDataStructure8Bit

(

kkint32 &

len

)

Creates the appropriate compressed data structure for the BMP 8-bit compressed file format. The length of the structure created will be returned in the 'len' parameter. The caller will be responsible for deleting the returned data structure.

Definition at line 358 of file BMPImage.cpp.

References KKB::KKStr::Concat(), KKB::BmpImage::CodePair::count, KKB::KKException::KKException(), and KKB::BmpImage::CodePair::pixel.

Referenced by KKB::BmpImage::SaveGrayscaleInverted8Bit().

{
  kkint32  buffSize = codesAllocated;

  uchar* buff = new uchar [buffSize + 4];  // + 4 For Safety
  memset (buff, 0, codesAllocated);

  kkint32  curPair = 0;
  top = &(codes[0]);

  kkint32  bp = 0;

  while  (curPair < used)
  {
    if  (bp >= (buffSize - 1))
    {
      kkint32  newBuffSize = buffSize * 2;
      uchar* newBuff = new uchar[newBuffSize + 2];
      if  (newBuff == NULL)
      {
        KKStr  errMsg = "BmpImage::CodedPixels::CreatePixelDataStructure8Bit    ***ERROR***     Allocation of 'newBuff'  failed.";
        cerr << std::endl << std::endl << errMsg << std::endl << std::endl;
        throw  KKException (errMsg);
      }

      memset (newBuff, 0, newBuffSize);
      memcpy (newBuff, buff, buffSize);
      delete[] buff;
      buff = newBuff;
      newBuff = NULL;
      buffSize = newBuffSize;
    }


    {
      if  ((top->count == 0)  &&  (top->pixel == 0))
      {
        // Add End Of Line 
        buff[bp] = 0;
        bp++;
        buff[bp] = 0;
        bp++;

        curPair++;
        top++;
      }

      else
      {
        if  (top->count > 254)
        {
          buff[bp] = 254;
          bp++;

          buff[bp] = top->pixel;
          bp++;

          top->count = top->count - 254;
        }

        else
        {
          buff[bp] = top->count;
          bp++;

          buff[bp] = top->pixel;
          bp++;

          curPair++;
          top++;
        }
      }
    }
  }


  buff[bp] = 0;
  bp++;

  buff[bp] = 1;
  bp++;

  len = bp;     
  return  buff;
} /* CreatePixelDataStructure */

void KKB::BmpImage::CodedPixels::EOL

(

)

This is called once at the end of each row of pixels.

Definition at line 266 of file BMPImage.cpp.

References KKB::BmpImage::CodePair::count, and KKB::BmpImage::CodePair::pixel.

Referenced by KKB::BmpImage::SaveGrayscaleInverted4Bit(), and KKB::BmpImage::SaveGrayscaleInverted8Bit().

{
  used++;
  top++;
  top->count = 0;
  top->pixel = 0;
}  /* EOL */

---

The documentation for this class was generated from the following file:

• C:/Users/Kurt/GitHub/KSquareLibraries/KKBase/BMPImage.cpp