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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "Filtercolorize.h"
#include "Filtergrayscale.h"
#include "Pixel24.h"
#include "../base/Exception.h"
namespace avg {
// From Foley, van Dam p. 596 incl. addendum fixes.
unsigned char hls_value(float n1, float n2, float hue)
{
if (hue>360)
hue-=360;
if (hue<0)
hue+=360;
float rv;
if (hue<60)
rv = n1+(n2-n1)*hue/60;
else if (hue<180)
rv = n2;
else if (hue<240)
rv = n1+(n2-n1)*(240-hue)/60;
else
rv = n1;
return (unsigned char)(rv*255);
}
Pixel24 hls2rgb (float h, float l, float s)
{
float m1, m2;
l /= 255;
s /= 100;
// Warning: Foley, van Dam has a typo on the next line!
m2 = (l<=0.5f)?(l*(1.0f+s)):(l+s-l*s);
m1 = 2.0f*l-m2;
if (s<0.001f) {
return Pixel24((unsigned char)(l*255), (unsigned char)(l*255),
(unsigned char)(l*255));
} else {
return Pixel24(hls_value(m1,m2,h+120),
hls_value(m1,m2,h),
hls_value(m1,m2,h-120));
}
}
FilterColorize::FilterColorize(float hue, float saturation)
: m_Hue(hue),
m_Saturation(saturation)
{
}
FilterColorize::~FilterColorize()
{
}
void FilterColorize::applyInPlace(BitmapPtr pBmp)
{
BitmapPtr pTempBmp (FilterGrayscale().apply(pBmp));
Pixel32 colorTable[256];
for (int i=0; i<256; i++) {
colorTable[i] = hls2rgb(m_Hue, float(i), m_Saturation);
}
unsigned char * pSrcLine = pTempBmp->getPixels();
unsigned char * pDestLine = pBmp->getPixels();
IntPoint size = pTempBmp->getSize();
for (int y = 0; y < size.y; ++y) {
unsigned char * pSrcPixel = pSrcLine;
switch (pBmp->getPixelFormat()) {
case R8G8B8A8:
case R8G8B8X8:
{
Pixel32 * pDestPixel = (Pixel32 *)pDestLine;
for (int x = 0; x < size.x; ++x) {
*pDestPixel = colorTable[*pSrcPixel];
++pSrcPixel;
++pDestPixel;
}
}
break;
case R8G8B8:
{
Pixel24 * pDestPixel = (Pixel24 *)pDestLine;
for (int x = 0; x < size.x; ++x) {
*pDestPixel = colorTable[*pSrcPixel];
++pSrcPixel;
++pDestPixel;
}
}
break;
case B8G8R8A8:
case B8G8R8X8:
{
Pixel32 * pDestPixel = (Pixel32 *)pDestLine;
for (int x = 0; x < size.x; ++x) {
*pDestPixel = colorTable[*pSrcPixel];
++pSrcPixel;
++pDestPixel;
}
}
break;
case B8G8R8:
{
Pixel24 * pDestPixel = (Pixel24 *)pDestLine;
for (int x = 0; x < size.x; ++x) {
*pDestPixel = colorTable[*pSrcPixel];
++pSrcPixel;
++pDestPixel;
}
}
break;
default:
AVG_ASSERT(false);
}
pSrcLine = pSrcLine + pTempBmp->getStride();
pDestLine = pDestLine + pBmp->getStride();
}
}
}
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