/*
This?software?contains?the?C++?implementation?of?the?“branch-and-mincut“?framework?for?image?segmentation
with?various?high-level?priors?as?described?in?the?paper:

V.?Lempitsky?A.?Blake?C.?Rother.?Image?Segmentation?by?Branch-and-Mincut.?
In?proceedings?of?European?Conference?on?Computer?Vision?（ECCV）?October?2008.

The?software?contains?the?core?algorithm?and?an?example?of?its?application?（globally-optimal?
segmentations?under?Chan-Vese?functional）.

Implemented?by?Victor?Lempitsky?2008
*/


#include?“BranchAndMincut.h“
#include?
#include?
#include?

//using?stl?for?the?queue?in?the?min
#include?
#include?
#include?
#include?


//////////////////////////////////


int?imWidth?=?0;
int?imHeight?=?0;
static?int?*bestSegm;
static?Branch?*bestBranch?=?NULL;
static?gtype?upperBound;?//best?leaf?energy?found?so?far

//////////////////////////////////////////////

static?int?statFlowCalls;?//counting?calls?to?lower?bound/energy?evaluations

//////////////////////////////////////////////


struct?
{
	GraphT?*graph;
	gtype?*bgUnaries;
	gtype?*fgUnaries;
	bool?maxflowWasCalled;

	void?Reset（gtype?*pairwise?gtype?*commonUnaries）
	{
		maxflowWasCalled?=?false;
		graph->reset（）;
		graph->add_node（imWidth*imHeight）;

		int?xyi;

		if（commonUnaries）
			for（i?=?0;?i?			{
				if（commonUnaries[i]?>?0）
					graph->add_tweights（i?commonUnaries[i]?0）;
				else
					graph->add_tweights（i?0?-commonUnaries[i]）;
			}


		for（y?=?0?i?=?0;?y?			for（x?=?0;?x?			{
				if（y?&&?x?add_edge（i?i-imWidth+1?pairwise[i*4]?pairwise[i*4]）;
				if（x?add_edge（i?i+1?pairwise[i*4+1]?pairwise[i*4+1]）;
				if（y?add_edge（i?i+imWidth+1?pairwise[i*4+2]?pairwise[i*4+2]）;
				if（y?add_edge（i?i+imWidth?pairwise[i*4+3]?pairwise[i*4+3]）;
			}

		memset（fgUnaries?0?sizeof（gtype）*imWidth*imHeight）;
		memset（bgUnaries?0?sizeof（gtype）*imWidth*imHeight）;
	}
}?reusable;

void?PrepareGraph（int?imwidth?int?imheight）
{
	imWidth?=?imwidth;
	imHeight?=?imheight;

	reusable.graph?=?new?GraphT（imwidth*imheight?imwidth*imheight*4）;
	reusable.bgUnaries?=?new?gtype[imwidth*imheight];
	reusable.fgUnaries?=?new?gtype[imwidth*imheight];
}

void?ReleaseGraph（）
{
	delete?reusable.graph;
	delete?reusable.bgUnaries;
	delete?reusable.fgUnaries;
}
//////////////////////////////////////////

//STL?stuff

struct?BranchWrapper
{
	Branch?*br;
	BranchWrapper（Branch?*b）:?br（b）?{}
};

using?namespace?std;
bool?operator<（const?BranchWrapper&?a?const?BranchWrapper&?b）
{
	return?a.br->bound?bound;
}
bool?operator>（const?BranchWrapper&?a?const?BranchWrapper&?b）
{
	return?a.br->bound?>?b.br->bound;
}
typedef?std::priority_queue