bmanip.cpp

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// $Id: bmanip.cpp 1282 2006-06-09 09:46:49Z alex $
// Bitmap merging routines
// DMc 17-3-98
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 */

#include "camtypes.h"
//#include "app.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "bmanip.h"

/******************************************************************************************

>   BOOL CBitmapManip::ApplyGaussianFilter(BYTE * bits, INT32 wid, INT32 hei, INT32 matrix[3][3],
            INT32 index)


    Author:     David_McClarnon (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1-10-98

    Inputs:     The source bitmap bits, its width and height and the matrix to apply

    Returns:    -

    Purpose:    Applies a 3x3 matrix to the bitmap's alpha channel

    Notes:      Remember DIB's are held upside-down in memory

******************************************************************************************/
BOOL CBitmapManip::ApplyGaussianFilter(BYTE * bits, INT32 wid, INT32 hei, INT32 matrix[3][3], 
                                       BOOL bIgnoreBlankPixels)
{
    // we need a temporary bitmap
    INT32 ksize = (wid) * (hei) * 4;

    BYTE * tmpBits = new BYTE[ksize];

    if (!tmpBits)
        return FALSE;

    memcpy(tmpBits, bits, ksize);

    INT32 size = wid * hei;
    size -= wid * 2;
    size -= 2;

    COLORREF *srcPtr = ((COLORREF *)bits);
    COLORREF *destPtr = ((COLORREF *)tmpBits) + wid + 1;

    UINT32 srcAlpha = 0;
    UINT32 destAlpha = 0;

    INT32 incBy1 = wid*4;

    INT32 sum = 0;

    INT32 posX = 0;
    INT32 posY = 1;

    COLORREF Area[3][3];

    INT32 i = 0;
    INT32 j = 0;

    BYTE R = 0;
    BYTE A = 0;

    INT32 SumR;
    INT32 SumA;

    while (posY < hei - 1)
    {
        // transfer colour
        for (i = 0 ; i < 3; i++)
        {
            for (j = 0 ; j < 3; j++)
            {
                Area[i][j] = *(srcPtr + i * wid + j);
            }
        }

        // now, ignore transparent areas
        if (((Area[1][1] & 0xff000000) >> 24) != 0xff || !bIgnoreBlankPixels)
        {
            SumR = 0;
            SumA = 0;
            sum = 0;

            for (i = 0 ; i < 3; i++)
            {
                for (j = 0 ; j < 3; j++)
                {
                    A = (BYTE)(Area[i][j] & 0xff000000) >> 24;
                    R = (BYTE)(Area[i][j] & 0xff);
                    
                    if (A != 0xff || !bIgnoreBlankPixels)
                    {
                        SumR += ((INT32)R) * matrix[i][j];
                        SumA += ((INT32)A) * matrix[i][j];
                        sum += matrix[i][j];
                    }
                }
            }

            SumR /= sum;
            SumA /= sum;
            
            *destPtr = SumR + (SumR << 8) + (SumR << 16) + (SumA << 24);
        }

        // increment of pointers
        posX ++;
        
        destPtr ++;
        srcPtr ++;

        if (posX >= wid - 3)
        {
            destPtr += 3;
            srcPtr += 3;
            posX = 0;
            posY ++;
        }   
    }

    memcpy(bits, tmpBits, wid * hei * 4);

    delete [] tmpBits;

    return TRUE;
}

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