#include "texception.h"
//#include "tfxparam.h"
#include "stdfx.h"

namespace
{
TPixel32 unmultiply(const TPixel32 &pix)
{
	if (!pix.m)
		return pix;
	double depremult = 255.0 / pix.m;
	return TPixel32((UCHAR)(pix.r * depremult),
					(UCHAR)(pix.g * depremult),
					(UCHAR)(pix.b * depremult),
					pix.m);
}
}

//===================================================================

class UnmultiplyFx : public TStandardRasterFx
{
	FX_PLUGIN_DECLARATION(UnmultiplyFx)
	TRasterFxPort m_input;

public:
	UnmultiplyFx() { addInputPort("Source", m_input); }
	~UnmultiplyFx(){};

	bool doGetBBox(double frame, TRectD &bBox, const TRenderSettings &info)
	{
		if (m_input.isConnected())
			return m_input->doGetBBox(frame, bBox, info);
		else {
			bBox = TRectD();
			return false;
		}
	}

	void doCompute(TTile &tile, double frame, const TRenderSettings &ri);
	bool canHandle(const TRenderSettings &info, double frame) { return true; }
};

//------------------------------------------------------------------------------

void UnmultiplyFx::doCompute(TTile &tile, double frame,
							 const TRenderSettings &ri)
{
	if (!m_input.isConnected())
		return;

	m_input->compute(tile, frame, ri);

	TRaster32P raster32 = tile.getRaster();
	assert(raster32); // per ora gestisco solo i Raster32

	int j;
	raster32->lock();
	for (j = 0; j < raster32->getLy(); j++) {
		TPixel32 *pix = raster32->pixels(j);
		TPixel32 *endPix = pix + raster32->getLx();
		while (pix < endPix) {
			if (pix->m) {
				double depremult = 255.0 / pix->m;
				pix->r = (UCHAR)(pix->r * depremult);
				pix->g = (UCHAR)(pix->g * depremult);
				pix->b = (UCHAR)(pix->b * depremult);
			}

			//*pix=unmultiply(*pix);
			pix++;
		}
	}
	raster32->unlock();
}

FX_PLUGIN_IDENTIFIER(UnmultiplyFx, "unmultiplyFx");