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/*
/--------------------------------------------------------------------
|
| $Id: plfilterthreshold.cpp,v 1.9 2004/09/11 12:41:36 uzadow Exp $
|
| Copyright (c) 2000-2001 Iyad Hatem
|
\--------------------------------------------------------------------
*/
#include "plfilterthreshold.h"
#include "plbitmap.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
PLFilterThreshold::PLFilterThreshold(int threshold_min,int threshold_max, int channel)
: PLFilter(),
m_threshold_min(threshold_min),
m_threshold_max(threshold_max),
m_channel(channel)
{
}
PLFilterThreshold::~PLFilterThreshold()
{
}
void PLFilterThreshold::Apply(PLBmpBase * pBmpSource, PLBmp * pBmpDest) const
{
int threshold_min = m_threshold_min;
int threshold_max = m_threshold_max;
int channel = m_channel;
// Only works for 32 bpp bitmaps at the moment.
PLASSERT (pBmpSource->GetBitsPerPixel() == 32);
pBmpDest->Create (pBmpSource->GetWidth(), pBmpSource->GetHeight(),
PLPixelFormat::L8, NULL, 0, pBmpSource->GetResolution());
PLBYTE ** pSrcLines = pBmpSource->GetLineArray();
PLBYTE ** pDstLines = pBmpDest->GetLineArray();
for (int y = 0; y<pBmpDest->GetHeight(); ++y)
{ // For each line
PLBYTE * pSrcPixel = pSrcLines[y];
PLBYTE * pDstPixel = pDstLines[y];
for (int x = 0; x < pBmpDest->GetWidth(); ++x)
{ // For each pixel
if ((PLBYTE (pSrcPixel[channel]) <= PLBYTE (threshold_min)) ||
(PLBYTE (pSrcPixel[channel]) >= PLBYTE(threshold_max)))
*pDstPixel = 0;
else
*pDstPixel = pSrcPixel[channel];
pSrcPixel += sizeof(PLPixel32);
++pDstPixel;
}
}
}
/*
/--------------------------------------------------------------------
|
| $Log: plfilterthreshold.cpp,v $
| Revision 1.9 2004/09/11 12:41:36 uzadow
| removed plstdpch.h
|
| Revision 1.8 2004/09/09 16:52:45 artcom
| refactored PixelFormat
|
| Revision 1.7 2004/06/15 10:26:13 uzadow
| Initial nonfunctioning version of plbmpbase.
|
| Revision 1.6 2003/11/05 15:17:26 artcom
| Added ability to specify initial data in PLBitmap::Create()
|
| Revision 1.5 2002/08/04 20:08:01 uzadow
| Added PLBmpInfo class, ability to extract metainformation from images without loading the whole image and proper greyscale support.
|
| Revision 1.4 2001/10/21 17:12:40 uzadow
| Added PSD decoder beta, removed BPPWanted from all decoders, added PLFilterPixel.
|
| Revision 1.3 2001/10/16 17:12:27 uzadow
| Added support for resolution information (Luca Piergentili)
|
| Revision 1.2 2001/10/06 22:37:08 uzadow
| Linux compatibility.
|
| Revision 1.1 2001/09/16 19:03:23 uzadow
| Added global name prefix PL, changed most filenames.
|
| Revision 1.4 2001/02/04 14:31:52 uzadow
| Member initialization list cleanup (Erik Hoffmann).
|
| Revision 1.3 2001/01/15 15:05:31 uzadow
| Added PLBmp::ApplyFilter() and PLBmp::CreateFilteredCopy()
|
| Revision 1.2 2000/12/18 22:42:53 uzadow
| Replaced RGBAPIXEL with PLPixel32.
|
| Revision 1.1 2000/09/26 14:28:47 Administrator
| Added Threshold filter
|
|
|
\--------------------------------------------------------------------
*/
|
