HistogramProcess.hpp

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#ifndef _TUTTLE_PLUGIN_HISTOGRAM_PROCESS_HPP_
#define _TUTTLE_PLUGIN_HISTOGRAM_PROCESS_HPP_

#include <tuttle/plugin/ImageGilFilterProcessor.hpp>
#include <terry/clamp.hpp>

namespace tuttle {
namespace plugin {
namespace histogram {

/**
 * @brief Histogram process
 *
 */
    
/**
 * Functor which compute alpha for each pixel
 */
struct Compute_alpha_pixel
{ 
        bool _isOutputBW; // is output black & white (or alpha channel)
    HistogramProcessParams<float> _params;
        
    template< typename Pixel>
    Pixel operator()( const Pixel& p )
    {
        using namespace boost::gil;

        rgb32f_pixel_t convert_to_rgb;
        color_convert( p, convert_to_rgb ); // first step : p to rgb_pixel
        terry::clamp_converter<rgb32f_pixel_t>()( convert_to_rgb, convert_to_rgb );
        hsl32f_pixel_t hsl_pix;
        color_convert(convert_to_rgb,hsl_pix ); // second step : rgb_pixel to hsl_pixel
        
        double alpha = 1.0;

        //RGBA
        for( int v = 0; v < boost::gil::num_channels<Pixel>::type::value -1; ++v ) // RGB but not alpha (doesn't needed)
        {
                        if(_params._boolRGB[v]->getValue()) //if current channel check-box is active
                        {
                                double value =  _params._paramColorRGB->getValue( v, _params._time,p[v] );

                                //clamp mode 
                                if(_params._boolClampCurveValues->getValue())
                                {
                                        if(value > 1.0)                 //clamp values superior to 1
                                                value = 1.0;
                                        else if(value < 0.0)    //clamp values inferior to 0
                                                value = 0.0;
                                }
                                value *= (double) _params._multiplierRGB[v]->getValue(); //multiplier RGB channels
                                alpha *= value;
                        }
        }
        //HSL
        for( int v = 0; v < boost::gil::num_channels<hsl32f_pixel_t>::type::value; ++v )
        {
                        if(_params._boolHSL[v]->getValue()) //if current channel check-box is active
                        {
                                double value = _params._paramColorHSL->getValue( v, _params._time,hsl_pix[v] );
                                //clamp mode 
                                if(_params._boolClampCurveValues->getValue())
                                {
                                        if(value > 1.0)                 //clamp values superior to 1
                                                value = 1.0;
                                        else if(value < 0.0)    //clamp values inferior to 0
                                                value = 0.0;
                                }
                                value *= (double) _params._multiplierHSL[v]->getValue(); //multiplier HSL channels
                                alpha *=  value;
                        }
        }
                Pixel ret;
                if( ! _params._boolReverseMask->getValue() ) //revert mask
                        alpha = 1-alpha;
                
                if( _isOutputBW ) // output is gray scale image
                {
                        gray32f_pixel_t inter; // need a gray_pixel
                        inter[0] = alpha;
                        color_convert( inter, ret ); // convert gray_pixel to rgba_pixel
                }
                else // output is alpha channel
                {
                        for( std::size_t i = 0; i < boost::gil::num_channels<Pixel>::type::value -1; ++i )
                                ret[i] = p[i];
                        ret[3] = alpha; //fill alpha channel up
                }
                return ret;
    }
};

template<class View>
class HistogramProcess : public ImageGilFilterProcessor<View>
{
public:
        typedef typename View::value_type Pixel;
        typedef typename boost::gil::channel_type<View>::type Channel;
        typedef float Scalar;
protected:
    HistogramPlugin&    _plugin;            ///< Rendering plugin
        HistogramProcessParams<Scalar> _params; ///< parameters

public:
    HistogramProcess( HistogramPlugin& effect );

        void setup( const OFX::RenderArguments& args );

    void multiThreadProcessImages( const OfxRectI& procWindowRoW );
};

}
}
}

#include "HistogramProcess.tcc"

#endif