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////////////////////////////////////////////////////////
//
// GEM - Graphics Environment for Multimedia
//
// zmoelnig@iem.kug.ac.at
//
// Implementation file
//
// Copyright (c) 1997-2000 Mark Danks.
// Copyright (c) Günther Geiger.
// Copyright (c) 2001-2011 IOhannes m zmölnig. forum::für::umläute. IEM. zmoelnig@iem.at
// Copyright (c) 2002 James Tittle & Chris Clepper
// For information on usage and redistribution, and for a DISCLAIMER OF ALL
// WARRANTIES, see the file, "GEM.LICENSE.TERMS" in this distribution.
//
/////////////////////////////////////////////////////////
#include "pix_a_2grey.h"
#include "Gem/PixConvert.h"
CPPEXTERN_NEW_WITH_ONE_ARG(pix_a_2grey, t_floatarg, A_DEFFLOAT);
/////////////////////////////////////////////////////////
//
// pix_a_2grey
//
/////////////////////////////////////////////////////////
// Constructor
//
/////////////////////////////////////////////////////////
pix_a_2grey :: pix_a_2grey(t_floatarg alpha)
{
m_mode = static_cast<int>(alpha * 255.f);
inlet_new(this->x_obj, &this->x_obj->ob_pd, gensym("float"), gensym("ft1"));
}
/////////////////////////////////////////////////////////
// Destructor
//
/////////////////////////////////////////////////////////
pix_a_2grey :: ~pix_a_2grey()
{ }
/////////////////////////////////////////////////////////
// alphaMess
//
/////////////////////////////////////////////////////////
void pix_a_2grey :: alphaMess(float alphaval)
{
if (alphaval > 1.f)
alphaval = 1.f;
if (alphaval < -1.f)
alphaval = -1.f;
m_mode = static_cast<int>(alphaval*255.f);
setPixModified();
}
/////////////////////////////////////////////////////////
// processImage
//
/////////////////////////////////////////////////////////
void pix_a_2grey :: processRGBAImage(imageStruct &image)
{
if (!m_mode)return;
unsigned char *pixels = image.data;
int count = image.ysize * image.xsize;
if (m_mode < 0){
const int realVal = -m_mode;
while (count--) {
if (pixels[chAlpha] < realVal){
const int grey = (pixels[chRed] * RGB2GRAY_RED + pixels[chGreen] * RGB2GRAY_GREEN + pixels[chBlue] * RGB2GRAY_BLUE)>>8;
pixels[chRed] = pixels[chGreen] = pixels[chBlue] = (unsigned char)grey;
}
pixels += 4;
}
}else{
while (count--){
if (pixels[chAlpha] > m_mode){
const int grey = (pixels[chRed] * RGB2GRAY_RED + pixels[chGreen] * RGB2GRAY_GREEN + pixels[chBlue] * RGB2GRAY_BLUE)>>8;
pixels[chRed] = pixels[chGreen] = pixels[chBlue] = (unsigned char)grey;
}
pixels += 4;
}
}
}
/////////////////////////////////////////////////////////
// static member function
//
/////////////////////////////////////////////////////////
void pix_a_2grey :: obj_setupCallback(t_class *classPtr)
{
class_addcreator(reinterpret_cast<t_newmethod>(create_pix_a_2grey),
gensym("pix_a_2gray"), A_NULL);
class_addmethod(classPtr, reinterpret_cast<t_method>(&pix_a_2grey::alphaMessCallback),
gensym("ft1"), A_FLOAT, A_NULL);
class_addmethod(classPtr, reinterpret_cast<t_method>(&pix_a_2grey::alphaMessCallback),
gensym("alpha"), A_FLOAT, A_NULL);
}
void pix_a_2grey :: alphaMessCallback(void *data, t_floatarg alphaval)
{
GetMyClass(data)->alphaMess(alphaval);
}
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