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|
/*
/--------------------------------------------------------------------
|
| $Id: plfiltergrayscale.cpp,v 1.11 2004/09/15 14:51:52 artcom Exp $
|
| Copyright (c) 1996-2002 Ulrich von Zadow
|
\--------------------------------------------------------------------
*/
#include "plfiltergrayscale.h"
#include "plbitmap.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
PLFilterGrayscale::PLFilterGrayscale() : PLFilter()
{
}
PLFilterGrayscale::~PLFilterGrayscale()
{
}
void PLFilterGrayscale::Apply(PLBmpBase * pBmpSource, PLBmp * pBmpDest) const
{
if (pBmpSource->IsGreyscale()) {
*pBmpDest = *pBmpSource;
return;
}
PLASSERT (pBmpSource->GetBitsPerPixel() == 32 ||
pBmpSource->GetBitsPerPixel() == 24);
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
// For the coefficients used, see http://www.inforamp.net/~poynton/
// We could approximate this for more speed by using
// Y = (54 * R + 183 * G + 19 * B)/256 like libpng does.
*pDstPixel = PLBYTE (pSrcPixel[PL_RGBA_RED]*0.212671+
pSrcPixel[PL_RGBA_GREEN]*0.715160+
pSrcPixel[PL_RGBA_BLUE]*0.072169);
if (pBmpSource->GetBitsPerPixel() == 32)
{
pSrcPixel += sizeof(PLPixel32);
}
else
{
pSrcPixel += sizeof(PLPixel24);
}
++pDstPixel;
}
}
}
/*
/--------------------------------------------------------------------
|
| $Log: plfiltergrayscale.cpp,v $
| Revision 1.11 2004/09/15 14:51:52 artcom
| - added PLPixelformatTest
| - added DICOM Decoder
|
| Revision 1.10 2004/09/11 12:41:36 uzadow
| removed plstdpch.h
|
| Revision 1.9 2004/09/09 16:52:45 artcom
| refactored PixelFormat
|
| Revision 1.8 2004/08/04 14:53:36 uzadow
| Added PLFilterColorize.
|
| 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 2002/03/31 13:36:42 uzadow
| Updated copyright.
|
| Revision 1.3 2001/10/16 17:12:26 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 1.7 2001/02/04 14:31:52 uzadow
| Member initialization list cleanup (Erik Hoffmann).
|
| Revision 1.6 2001/01/15 15:05:31 uzadow
| Added PLBmp::ApplyFilter() and PLBmp::CreateFilteredCopy()
|
| Revision 1.5 2000/12/18 22:42:53 uzadow
| Replaced RGBAPIXEL with PLPixel32.
|
| Revision 1.4 2000/09/26 10:47:41 Administrator
| Added comment
|
| Revision 1.3 2000/01/16 20:43:15 anonymous
| Removed MFC dependencies
|
| Revision 1.2 1999/12/08 16:31:40 Ulrich von Zadow
| Unix compatibility
|
| Revision 1.1 1999/10/21 16:05:17 Ulrich von Zadow
| Moved filters to separate directory. Added Crop, Grayscale and
| GetAlpha filters.
|
| Revision 1.1 1999/10/19 21:29:44 Ulrich von Zadow
| Added filters.
|
|
\--------------------------------------------------------------------
*/
|
