/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/intern/colortools.c
 *  \ingroup bke
 */


#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <float.h>

#include "MEM_guardedalloc.h"

#include "DNA_color_types.h"
#include "DNA_curve_types.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "BKE_colortools.h"
#include "BKE_curve.h"
#include "BKE_fcurve.h"


#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"

/* ********************************* color curve ********************* */

/* ***************** operations on full struct ************* */

CurveMapping *curvemapping_add(int tot, float minx, float miny, float maxx, float maxy)
{
	CurveMapping *cumap;
	int a;
	float clipminx, clipminy, clipmaxx, clipmaxy;
	
	cumap= MEM_callocN(sizeof(CurveMapping), "new curvemap");
	cumap->flag= CUMA_DO_CLIP;
	if (tot==4) cumap->cur= 3;		/* rhms, hack for 'col' curve? */
	
	clipminx = MIN2(minx, maxx);
	clipminy = MIN2(miny, maxy);
	clipmaxx = MAX2(minx, maxx);
	clipmaxy = MAX2(miny, maxy);
	
	BLI_init_rctf(&cumap->curr, clipminx, clipmaxx, clipminy, clipmaxy);
	cumap->clipr= cumap->curr;
	
	cumap->white[0]= cumap->white[1]= cumap->white[2]= 1.0f;
	cumap->bwmul[0]= cumap->bwmul[1]= cumap->bwmul[2]= 1.0f;
	
	for (a=0; a<tot; a++) {
		cumap->cm[a].flag= CUMA_EXTEND_EXTRAPOLATE;
		cumap->cm[a].totpoint= 2;
		cumap->cm[a].curve= MEM_callocN(2*sizeof(CurveMapPoint), "curve points");
		
		cumap->cm[a].curve[0].x= minx;
		cumap->cm[a].curve[0].y= miny;
		cumap->cm[a].curve[1].x= maxx;
		cumap->cm[a].curve[1].y= maxy;
	}	

	cumap->changed_timestamp = 0;

	return cumap;
}

void curvemapping_free(CurveMapping *cumap)
{
	int a;
	
	if (cumap) {
		for (a=0; a<CM_TOT; a++) {
			if (cumap->cm[a].curve) MEM_freeN(cumap->cm[a].curve);
			if (cumap->cm[a].table) MEM_freeN(cumap->cm[a].table);
			if (cumap->cm[a].premultable) MEM_freeN(cumap->cm[a].premultable);
		}
		MEM_freeN(cumap);
	}
}

CurveMapping *curvemapping_copy(CurveMapping *cumap)
{
	int a;
	
	if (cumap) {
		CurveMapping *cumapn= MEM_dupallocN(cumap);
		for (a=0; a<CM_TOT; a++) {
			if (cumap->cm[a].curve) 
				cumapn->cm[a].curve= MEM_dupallocN(cumap->cm[a].curve);
			if (cumap->cm[a].table) 
				cumapn->cm[a].table= MEM_dupallocN(cumap->cm[a].table);
			if (cumap->cm[a].premultable) 
				cumapn->cm[a].premultable= MEM_dupallocN(cumap->cm[a].premultable);
		}
		return cumapn;
	}
	return NULL;
}

void curvemapping_set_black_white(CurveMapping *cumap, const float black[3], const float white[3])
{
	int a;
	
	if (white)
		copy_v3_v3(cumap->white, white);
	if (black)
		copy_v3_v3(cumap->black, black);
	
	for (a=0; a<3; a++) {
		if (cumap->white[a]==cumap->black[a])
			cumap->bwmul[a]= 0.0f;
		else
			cumap->bwmul[a]= 1.0f/(cumap->white[a] - cumap->black[a]);
	}	
}

/* ***************** operations on single curve ************* */
/* ********** NOTE: requires curvemapping_changed() call after ******** */

/* removes with flag set */
void curvemap_remove(CurveMap *cuma, int flag)
{
	CurveMapPoint *cmp= MEM_mallocN((cuma->totpoint)*sizeof(CurveMapPoint), "curve points");
	int a, b, removed=0;
	
	/* well, lets keep the two outer points! */
	cmp[0]= cuma->curve[0];
	for (a=1, b=1; a<cuma->totpoint-1; a++) {
		if (!(cuma->curve[a].flag & flag)) {
			cmp[b]= cuma->curve[a];
			b++;
		}
		else removed++;
	}
	cmp[b]= cuma->curve[a];
	
	MEM_freeN(cuma->curve);
	cuma->curve= cmp;
	cuma->totpoint -= removed;
}

void curvemap_insert(CurveMap *cuma, float x, float y)
{
	CurveMapPoint *cmp= MEM_callocN((cuma->totpoint+1)*sizeof(CurveMapPoint), "curve points");
	int a, b, foundloc= 0;
		
	/* insert fragments of the old one and the new point to the new curve */
	cuma->totpoint++;
	for (a=0, b=0; a<cuma->totpoint; a++) {
		if ((x < cuma->curve[a].x) && !foundloc) {
			cmp[a].x= x;
			cmp[a].y= y;
			cmp[a].flag= CUMA_SELECT;
			foundloc= 1;
		}
		else {
			cmp[a].x= cuma->curve[b].x;
			cmp[a].y= cuma->curve[b].y;
			cmp[a].flag= cuma->curve[b].flag;
			cmp[a].flag &= ~CUMA_SELECT; /* make sure old points don't remain selected */
			cmp[a].shorty= cuma->curve[b].shorty;
			b++;
		}
	}

	/* free old curve and replace it with new one */
	MEM_freeN(cuma->curve);
	cuma->curve= cmp;
}

void curvemap_reset(CurveMap *cuma, rctf *clipr, int preset, int slope)
{
	if (cuma->curve)
		MEM_freeN(cuma->curve);

	switch (preset) {
		case CURVE_PRESET_LINE: cuma->totpoint= 2; break;
		case CURVE_PRESET_SHARP: cuma->totpoint= 4; break;
		case CURVE_PRESET_SMOOTH: cuma->totpoint= 4; break;
		case CURVE_PRESET_MAX: cuma->totpoint= 2; break;
		case CURVE_PRESET_MID9: cuma->totpoint= 9; break;
		case CURVE_PRESET_ROUND: cuma->totpoint= 4; break;
		case CURVE_PRESET_ROOT: cuma->totpoint= 4; break;
	}

	cuma->curve= MEM_callocN(cuma->totpoint*sizeof(CurveMapPoint), "curve points");

	switch (preset) {
		case CURVE_PRESET_LINE:
			cuma->curve[0].x= clipr->xmin;
			cuma->curve[0].y= clipr->ymax;
			cuma->curve[0].flag= 0;
			cuma->curve[1].x= clipr->xmax;
			cuma->curve[1].y= clipr->ymin;
			cuma->curve[1].flag= 0;
			break;
		case CURVE_PRESET_SHARP:
			cuma->curve[0].x= 0;
			cuma->curve[0].y= 1;
			cuma->curve[1].x= 0.25;
			cuma->curve[1].y= 0.50;
			cuma->curve[2].x= 0.75;
			cuma->curve[2].y= 0.04;
			cuma->curve[3].x= 1;
			cuma->curve[3].y= 0;
			break;
		case CURVE_PRESET_SMOOTH:
			cuma->curve[0].x= 0;
			cuma->curve[0].y= 1;
			cuma->curve[1].x= 0.25;
			cuma->curve[1].y= 0.94;
			cuma->curve[2].x= 0.75;
			cuma->curve[2].y= 0.06;
			cuma->curve[3].x= 1;
			cuma->curve[3].y= 0;
			break;
		case CURVE_PRESET_MAX:
			cuma->curve[0].x= 0;
			cuma->curve[0].y= 1;
			cuma->curve[1].x= 1;
			cuma->curve[1].y= 1;
			break;
		case CURVE_PRESET_MID9:
			{
				int i;
				for (i = 0; i < cuma->totpoint; i++) {
					cuma->curve[i].x = i / ((float)cuma->totpoint - 1);
					cuma->curve[i].y = 0.5;
				}
			}
			break;
		case CURVE_PRESET_ROUND:
			cuma->curve[0].x= 0;
			cuma->curve[0].y= 1;
			cuma->curve[1].x= 0.5;
			cuma->curve[1].y= 0.90;
			cuma->curve[2].x= 0.86;
			cuma->curve[2].y= 0.5;
			cuma->curve[3].x= 1;
			cuma->curve[3].y= 0;
			break;
		case CURVE_PRESET_ROOT:
			cuma->curve[0].x= 0;
			cuma->curve[0].y= 1;
			cuma->curve[1].x= 0.25;
			cuma->curve[1].y= 0.95;
			cuma->curve[2].x= 0.75;
			cuma->curve[2].y= 0.44;
			cuma->curve[3].x= 1;
			cuma->curve[3].y= 0;
			break;
	}

	/* mirror curve in x direction to have positive slope
	 * rather than default negative slope */
	if (slope == CURVEMAP_SLOPE_POSITIVE) {
		int i, last=cuma->totpoint-1;
		CurveMapPoint *newpoints= MEM_dupallocN(cuma->curve);
		
		for (i=0; i<cuma->totpoint; i++) {
			newpoints[i].y = cuma->curve[last-i].y;
		}
		
		MEM_freeN(cuma->curve);
		cuma->curve = newpoints;
	}
	
	if (cuma->table) {
		MEM_freeN(cuma->table);
		cuma->table= NULL;
	}
}

/* if type==1: vector, else auto */
void curvemap_sethandle(CurveMap *cuma, int type)
{
	int a;
	
	for (a=0; a<cuma->totpoint; a++) {
		if (cuma->curve[a].flag & CUMA_SELECT) {
			if (type) cuma->curve[a].flag |= CUMA_VECTOR;
			else cuma->curve[a].flag &= ~CUMA_VECTOR;
		}
	}
}

/* *********************** Making the tables and display ************** */

/* reduced copy of garbled calchandleNurb() code in curve.c */
static void calchandle_curvemap(BezTriple *bezt, BezTriple *prev, BezTriple *next, int UNUSED(mode))
{
	float *p1,*p2,*p3,pt[3];
	float len,len_a, len_b;
	float dvec_a[2], dvec_b[2];

	if (bezt->h1==0 && bezt->h2==0) {
		return;
	}
	
	p2= bezt->vec[1];
	
	if (prev==NULL) {
		p3= next->vec[1];
		pt[0]= 2.0f*p2[0] - p3[0];
		pt[1]= 2.0f*p2[1] - p3[1];
		p1= pt;
	}
	else {
		p1= prev->vec[1];
	}
	
	if (next==NULL) {
		p1= prev->vec[1];
		pt[0]= 2.0f*p2[0] - p1[0];
		pt[1]= 2.0f*p2[1] - p1[1];
		p3= pt;
	}
	else {
		p3= next->vec[1];
	}

	sub_v2_v2v2(dvec_a, p2, p1);
	sub_v2_v2v2(dvec_b, p3, p2);

	len_a= len_v2(dvec_a);
	len_b= len_v2(dvec_b);

	if (len_a==0.0f) len_a=1.0f;
	if (len_b==0.0f) len_b=1.0f;

	if (bezt->h1==HD_AUTO || bezt->h2==HD_AUTO) { /* auto */
		float tvec[2];
		tvec[0]= dvec_b[0]/len_b + dvec_a[0]/len_a;
		tvec[1]= dvec_b[1]/len_b + dvec_a[1]/len_a;

		len= len_v2(tvec) * 2.5614f;
		if (len!=0.0f) {
			
			if (bezt->h1==HD_AUTO) {
				len_a/=len;
				madd_v2_v2v2fl(p2-3, p2, tvec, -len_a);
			}
			if (bezt->h2==HD_AUTO) {
				len_b/=len;
				madd_v2_v2v2fl(p2+3, p2, tvec,  len_b);
			}
		}
	}

	if (bezt->h1==HD_VECT) {	/* vector */
		madd_v2_v2v2fl(p2-3, p2, dvec_a, -1.0f/3.0f);
	}
	if (bezt->h2==HD_VECT) {
		madd_v2_v2v2fl(p2+3, p2, dvec_b,  1.0f/3.0f);
	}
}

/* in X, out Y. 
 * X is presumed to be outside first or last */
static float curvemap_calc_extend(CurveMap *cuma, float x, const float first[2], const float last[2])
{
	if (x <= first[0]) {
		if ((cuma->flag & CUMA_EXTEND_EXTRAPOLATE)==0) {
			/* no extrapolate */
			return first[1];
		}
		else {
			if (cuma->ext_in[0]==0.0f)
				return first[1] + cuma->ext_in[1]*10000.0f;
			else
				return first[1] + cuma->ext_in[1]*(x - first[0])/cuma->ext_in[0];
		}
	}
	else if (x >= last[0]) {
		if ((cuma->flag & CUMA_EXTEND_EXTRAPOLATE)==0) {
			/* no extrapolate */
			return last[1];
		}
		else {
			if (cuma->ext_out[0]==0.0f)
				return last[1] - cuma->ext_out[1]*10000.0f;
			else
				return last[1] + cuma->ext_out[1]*(x - last[0])/cuma->ext_out[0];
		}
	}
	return 0.0f;
}

/* only creates a table for a single channel in CurveMapping */
static void curvemap_make_table(CurveMap *cuma, rctf *clipr)
{
	CurveMapPoint *cmp= cuma->curve;
	BezTriple *bezt;
	float *fp, *allpoints, *lastpoint, curf, range;
	int a, totpoint;
	
	if (cuma->curve==NULL) return;
	
	/* default rect also is table range */
	cuma->mintable= clipr->xmin;
	cuma->maxtable= clipr->xmax;
	
	/* hrmf... we now rely on blender ipo beziers, these are more advanced */
	bezt= MEM_callocN(cuma->totpoint*sizeof(BezTriple), "beztarr");
	
	for (a=0; a<cuma->totpoint; a++) {
		cuma->mintable= MIN2(cuma->mintable, cmp[a].x);
		cuma->maxtable= MAX2(cuma->maxtable, cmp[a].x);
		bezt[a].vec[1][0]= cmp[a].x;
		bezt[a].vec[1][1]= cmp[a].y;
		if (cmp[a].flag & CUMA_VECTOR)
			bezt[a].h1= bezt[a].h2= HD_VECT;
		else
			bezt[a].h1= bezt[a].h2= HD_AUTO;
	}
	
	for (a=0; a<cuma->totpoint; a++) {
		if (a==0)
			calchandle_curvemap(bezt, NULL, bezt+1, 0);
		else if (a==cuma->totpoint-1)
			calchandle_curvemap(bezt+a, bezt+a-1, NULL, 0);
		else
			calchandle_curvemap(bezt+a, bezt+a-1, bezt+a+1, 0);
	}
	
	/* first and last handle need correction, instead of pointing to center of next/prev, 
	 * we let it point to the closest handle */
	if (cuma->totpoint>2) {
		float hlen, nlen, vec[3];
		
		if (bezt[0].h2==HD_AUTO) {
			
			hlen= len_v3v3(bezt[0].vec[1], bezt[0].vec[2]);	/* original handle length */
			/* clip handle point */
			copy_v3_v3(vec, bezt[1].vec[0]);
			if (vec[0] < bezt[0].vec[1][0])
				vec[0]= bezt[0].vec[1][0];
			
			sub_v3_v3(vec, bezt[0].vec[1]);
			nlen= len_v3(vec);
			if (nlen>FLT_EPSILON) {
				mul_v3_fl(vec, hlen/nlen);
				add_v3_v3v3(bezt[0].vec[2], vec, bezt[0].vec[1]);
				sub_v3_v3v3(bezt[0].vec[0], bezt[0].vec[1], vec);
			}
		}
		a= cuma->totpoint-1;
		if (bezt[a].h2==HD_AUTO) {
			
			hlen= len_v3v3(bezt[a].vec[1], bezt[a].vec[0]);	/* original handle length */
			/* clip handle point */
			copy_v3_v3(vec, bezt[a-1].vec[2]);
			if (vec[0] > bezt[a].vec[1][0])
				vec[0]= bezt[a].vec[1][0];
			
			sub_v3_v3(vec, bezt[a].vec[1]);
			nlen= len_v3(vec);
			if (nlen>FLT_EPSILON) {
				mul_v3_fl(vec, hlen/nlen);
				add_v3_v3v3(bezt[a].vec[0], vec, bezt[a].vec[1]);
				sub_v3_v3v3(bezt[a].vec[2], bezt[a].vec[1], vec);
			}
		}
	}	
	/* make the bezier curve */
	if (cuma->table)
		MEM_freeN(cuma->table);
	totpoint= (cuma->totpoint-1)*CM_RESOL;
	fp= allpoints= MEM_callocN(totpoint*2*sizeof(float), "table");
	
	for (a=0; a<cuma->totpoint-1; a++, fp += 2*CM_RESOL) {
		correct_bezpart(bezt[a].vec[1], bezt[a].vec[2], bezt[a+1].vec[0], bezt[a+1].vec[1]);
		BKE_curve_forward_diff_bezier(bezt[a].vec[1][0], bezt[a].vec[2][0], bezt[a+1].vec[0][0], bezt[a+1].vec[1][0], fp, CM_RESOL-1, 2*sizeof(float));	
		BKE_curve_forward_diff_bezier(bezt[a].vec[1][1], bezt[a].vec[2][1], bezt[a+1].vec[0][1], bezt[a+1].vec[1][1], fp+1, CM_RESOL-1, 2*sizeof(float));
	}
	
	/* store first and last handle for extrapolation, unit length */
	cuma->ext_in[0]= bezt[0].vec[0][0] - bezt[0].vec[1][0];
	cuma->ext_in[1]= bezt[0].vec[0][1] - bezt[0].vec[1][1];
	range= sqrt(cuma->ext_in[0]*cuma->ext_in[0] + cuma->ext_in[1]*cuma->ext_in[1]);
	cuma->ext_in[0]/= range;
	cuma->ext_in[1]/= range;
	
	a= cuma->totpoint-1;
	cuma->ext_out[0]= bezt[a].vec[1][0] - bezt[a].vec[2][0];
	cuma->ext_out[1]= bezt[a].vec[1][1] - bezt[a].vec[2][1];
	range= sqrt(cuma->ext_out[0]*cuma->ext_out[0] + cuma->ext_out[1]*cuma->ext_out[1]);
	cuma->ext_out[0]/= range;
	cuma->ext_out[1]/= range;
	
	/* cleanup */
	MEM_freeN(bezt);

	range= CM_TABLEDIV*(cuma->maxtable - cuma->mintable);
	cuma->range= 1.0f/range;
	
	/* now make a table with CM_TABLE equal x distances */
	fp= allpoints;
	lastpoint= allpoints + 2*(totpoint-1);
	cmp= MEM_callocN((CM_TABLE+1)*sizeof(CurveMapPoint), "dist table");
	
	for (a=0; a<=CM_TABLE; a++) {
		curf= cuma->mintable + range*(float)a;
		cmp[a].x= curf;
		
		/* get the first x coordinate larger than curf */
		while (curf >= fp[0] && fp!=lastpoint) {
			fp+=2;
		}
		if (fp==allpoints || (curf >= fp[0] && fp==lastpoint))
			cmp[a].y= curvemap_calc_extend(cuma, curf, allpoints, lastpoint);
		else {
			float fac1= fp[0] - fp[-2];
			float fac2= fp[0] - curf;
			if (fac1 > FLT_EPSILON)
				fac1= fac2/fac1;
			else
				fac1= 0.0f;
			cmp[a].y= fac1*fp[-1] + (1.0f-fac1)*fp[1];
		}
	}
	
	MEM_freeN(allpoints);
	cuma->table= cmp;
}

/* call when you do images etc, needs restore too. also verifies tables */
/* it uses a flag to prevent premul or free to happen twice */
void curvemapping_premultiply(CurveMapping *cumap, int restore)
{
	int a;
	
	if (restore) {
		if (cumap->flag & CUMA_PREMULLED) {
			for (a=0; a<3; a++) {
				MEM_freeN(cumap->cm[a].table);
				cumap->cm[a].table= cumap->cm[a].premultable;
				cumap->cm[a].premultable= NULL;
			}
			
			cumap->flag &= ~CUMA_PREMULLED;
		}
	}
	else {
		if ((cumap->flag & CUMA_PREMULLED)==0) {
			/* verify and copy */
			for (a=0; a<3; a++) {
				if (cumap->cm[a].table==NULL)
					curvemap_make_table(cumap->cm+a, &cumap->clipr);
				cumap->cm[a].premultable= cumap->cm[a].table;
				cumap->cm[a].table= MEM_mallocN((CM_TABLE+1)*sizeof(CurveMapPoint), "premul table");
				memcpy(cumap->cm[a].table, cumap->cm[a].premultable, (CM_TABLE+1)*sizeof(CurveMapPoint));
			}
			
			if (cumap->cm[3].table==NULL)
				curvemap_make_table(cumap->cm+3, &cumap->clipr);
		
			/* premul */
			for (a=0; a<3; a++) {
				int b;
				for (b=0; b<=CM_TABLE; b++) {
					cumap->cm[a].table[b].y= curvemap_evaluateF(cumap->cm+3, cumap->cm[a].table[b].y);
				}
			}
			
			cumap->flag |= CUMA_PREMULLED;
		}
	}
}

static int sort_curvepoints(const void *a1, const void *a2)
{
	const struct CurveMapPoint *x1=a1, *x2=a2;
	
	if ( x1->x > x2->x ) return 1;
	else if ( x1->x < x2->x) return -1;
	return 0;
}

/* ************************ more CurveMapping calls *************** */

/* note; only does current curvemap! */
void curvemapping_changed(CurveMapping *cumap, int rem_doubles)
{
	CurveMap *cuma= cumap->cm+cumap->cur;
	CurveMapPoint *cmp= cuma->curve;
	rctf *clipr= &cumap->clipr;
	float thresh= 0.01f*(clipr->xmax - clipr->xmin);
	float dx= 0.0f, dy= 0.0f;
	int a;

	cumap->changed_timestamp++;

	/* clamp with clip */
	if (cumap->flag & CUMA_DO_CLIP) {
		for (a=0; a<cuma->totpoint; a++) {
			if (cmp[a].flag & CUMA_SELECT) {
				if (cmp[a].x < clipr->xmin)
					dx= MIN2(dx, cmp[a].x - clipr->xmin);
				else if (cmp[a].x > clipr->xmax)
					dx= MAX2(dx, cmp[a].x - clipr->xmax);
				if (cmp[a].y < clipr->ymin)
					dy= MIN2(dy, cmp[a].y - clipr->ymin);
				else if (cmp[a].y > clipr->ymax)
					dy= MAX2(dy, cmp[a].y - clipr->ymax);
			}
		}
		for (a=0; a<cuma->totpoint; a++) {
			if (cmp[a].flag & CUMA_SELECT) {
				cmp[a].x -= dx;
				cmp[a].y -= dy;
			}
		}
	}
	
	
	qsort(cmp, cuma->totpoint, sizeof(CurveMapPoint), sort_curvepoints);
	
	/* remove doubles, threshold set on 1% of default range */
	if (rem_doubles && cuma->totpoint>2) {
		for (a=0; a<cuma->totpoint-1; a++) {
			dx= cmp[a].x - cmp[a+1].x;
			dy= cmp[a].y - cmp[a+1].y;
			if ( sqrtf(dx*dx + dy*dy) < thresh ) {
				if (a==0) {
					cmp[a+1].flag|= 2;
					if (cmp[a+1].flag & CUMA_SELECT)
						cmp[a].flag |= CUMA_SELECT;
				}
				else {
					cmp[a].flag|= 2;
					if (cmp[a].flag & CUMA_SELECT)
						cmp[a+1].flag |= CUMA_SELECT;
				}
				break;	/* we assume 1 deletion per edit is ok */
			}
		}
		if (a != cuma->totpoint-1)
			curvemap_remove(cuma, 2);
	}	
	curvemap_make_table(cuma, clipr);
}

/* table should be verified */
float curvemap_evaluateF(CurveMap *cuma, float value)
{
	float fi;
	int i;

	/* index in table */
	fi= (value-cuma->mintable)*cuma->range;
	i= (int)fi;
	
	/* fi is table float index and should check against table range i.e. [0.0 CM_TABLE] */
	if (fi<0.0f || fi>CM_TABLE)
		return curvemap_calc_extend(cuma, value, &cuma->table[0].x, &cuma->table[CM_TABLE].x);
	else {
		if (i<0) return cuma->table[0].y;
		if (i>=CM_TABLE) return cuma->table[CM_TABLE].y;
		
		fi= fi-(float)i;
		return (1.0f-fi)*cuma->table[i].y + (fi)*cuma->table[i+1].y; 
	}
}

/* works with curve 'cur' */
float curvemapping_evaluateF(CurveMapping *cumap, int cur, float value)
{
	CurveMap *cuma= cumap->cm+cur;
	
	/* allocate or bail out */
	if (cuma->table==NULL) {
		curvemap_make_table(cuma, &cumap->clipr);
		if (cuma->table==NULL)
			return 1.0f-value;
	}
	return curvemap_evaluateF(cuma, value);
}

/* vector case */
void curvemapping_evaluate3F(CurveMapping *cumap, float vecout[3], const float vecin[3])
{
	vecout[0]= curvemapping_evaluateF(cumap, 0, vecin[0]);
	vecout[1]= curvemapping_evaluateF(cumap, 1, vecin[1]);
	vecout[2]= curvemapping_evaluateF(cumap, 2, vecin[2]);
}

/* RGB case, no black/white points, no premult */
void curvemapping_evaluateRGBF(CurveMapping *cumap, float vecout[3], const float vecin[3])
{
	vecout[0]= curvemapping_evaluateF(cumap, 0, curvemapping_evaluateF(cumap, 3, vecin[0]));
	vecout[1]= curvemapping_evaluateF(cumap, 1, curvemapping_evaluateF(cumap, 3, vecin[1]));
	vecout[2]= curvemapping_evaluateF(cumap, 2, curvemapping_evaluateF(cumap, 3, vecin[2]));
}


/* RGB with black/white points and premult. tables are checked */
void curvemapping_evaluate_premulRGBF(CurveMapping *cumap, float vecout[3], const float vecin[3])
{
	float fac;
	
	fac= (vecin[0] - cumap->black[0])*cumap->bwmul[0];
	vecout[0]= curvemap_evaluateF(cumap->cm, fac);
	
	fac= (vecin[1] - cumap->black[1])*cumap->bwmul[1];
	vecout[1]= curvemap_evaluateF(cumap->cm+1, fac);
	
	fac= (vecin[2] - cumap->black[2])*cumap->bwmul[2];
	vecout[2]= curvemap_evaluateF(cumap->cm+2, fac);
}


/* only used for image editor curves */
void curvemapping_do_ibuf(CurveMapping *cumap, ImBuf *ibuf)
{
	ImBuf *tmpbuf;
	int pixel;
	float *pix_in;
	float col[3];
	int stride= 4;
	float *pix_out;
	
	if (ibuf==NULL)
		return;
	if (ibuf->rect_float==NULL)
		IMB_float_from_rect(ibuf);
	else if (ibuf->rect==NULL)
		imb_addrectImBuf(ibuf);
	
	if (!ibuf->rect || !ibuf->rect_float)
		return;
	
	/* work on a temp buffer, so can color manage afterwards.
	 * No worse off memory wise than comp nodes */
	tmpbuf = IMB_dupImBuf(ibuf);
	
	curvemapping_premultiply(cumap, 0);
	
	pix_in= ibuf->rect_float;
	pix_out= tmpbuf->rect_float;

	if (ibuf->channels)
		stride= ibuf->channels;
	
	for (pixel= ibuf->x*ibuf->y; pixel>0; pixel--, pix_in+=stride, pix_out+=stride) {
		if (stride<3) {
			col[0]= curvemap_evaluateF(cumap->cm, *pix_in);
			
			pix_out[1]= pix_out[2]= pix_out[3]= pix_out[0]= col[0];
		}
		else {
			curvemapping_evaluate_premulRGBF(cumap, col, pix_in);
			pix_out[0]= col[0];
			pix_out[1]= col[1];
			pix_out[2]= col[2];
			if (stride>3)
				pix_out[3]= pix_in[3];
			else
				pix_out[3]= 1.f;
		}
	}
	
	IMB_rect_from_float(tmpbuf);
	SWAP(unsigned int *, tmpbuf->rect, ibuf->rect);
	IMB_freeImBuf(tmpbuf);
	
	curvemapping_premultiply(cumap, 1);
}

int curvemapping_RGBA_does_something(CurveMapping *cumap)
{
	int a;
	
	if (cumap->black[0]!=0.0f) return 1;
	if (cumap->black[1]!=0.0f) return 1;
	if (cumap->black[2]!=0.0f) return 1;
	if (cumap->white[0]!=1.0f) return 1;
	if (cumap->white[1]!=1.0f) return 1;
	if (cumap->white[2]!=1.0f) return 1;
	
	for (a=0; a<CM_TOT; a++) {
		if (cumap->cm[a].curve) {
			if (cumap->cm[a].totpoint!=2)  return 1;
			
			if (cumap->cm[a].curve[0].x != 0.0f) return 1;
			if (cumap->cm[a].curve[0].y != 0.0f) return 1;
			if (cumap->cm[a].curve[1].x != 1.0f) return 1;
			if (cumap->cm[a].curve[1].y != 1.0f) return 1;
		}
	}
	return 0;
}

void curvemapping_initialize(CurveMapping *cumap)
{
	int a;
	
	if (cumap==NULL) return;
	
	for (a=0; a<CM_TOT; a++) {
		if (cumap->cm[a].table==NULL)
			curvemap_make_table(cumap->cm+a, &cumap->clipr);
	}
}

void curvemapping_table_RGBA(CurveMapping *cumap, float **array, int *size)
{
	int a;
	
	*size = CM_TABLE+1;
	*array = MEM_callocN(sizeof(float)*(*size)*4, "CurveMapping");
	curvemapping_initialize(cumap);

	for (a=0; a<*size; a++) {
		if (cumap->cm[0].table)
			(*array)[a*4+0]= cumap->cm[0].table[a].y;
		if (cumap->cm[1].table)
			(*array)[a*4+1]= cumap->cm[1].table[a].y;
		if (cumap->cm[2].table)
			(*array)[a*4+2]= cumap->cm[2].table[a].y;
		if (cumap->cm[3].table)
			(*array)[a*4+3]= cumap->cm[3].table[a].y;
	}
}

/* ***************** Histogram **************** */

#define INV_255		(1.f/255.f)

DO_INLINE int get_bin_float(float f)
{
	int bin= (int)((f*255.0f) + 0.5f);	/* 0.5 to prevent quantisation differences */

	/* note: clamp integer instead of float to avoid problems with NaN */
	CLAMP(bin, 0, 255);

	return bin;
}

DO_INLINE void save_sample_line(Scopes *scopes, const int idx, const float fx, const float rgb[3], const float ycc[3])
{
	float yuv[3];

	/* vectorscope*/
	rgb_to_yuv(rgb[0], rgb[1], rgb[2], &yuv[0], &yuv[1], &yuv[2]);
	scopes->vecscope[idx + 0] = yuv[1];
	scopes->vecscope[idx + 1] = yuv[2];

	/* waveform */
	switch (scopes->wavefrm_mode) {
		case SCOPES_WAVEFRM_RGB:
			scopes->waveform_1[idx + 0] = fx;
			scopes->waveform_1[idx + 1] = rgb[0];
			scopes->waveform_2[idx + 0] = fx;
			scopes->waveform_2[idx + 1] = rgb[1];
			scopes->waveform_3[idx + 0] = fx;
			scopes->waveform_3[idx + 1] = rgb[2];
			break;
		case SCOPES_WAVEFRM_LUMA:
			scopes->waveform_1[idx + 0] = fx;
			scopes->waveform_1[idx + 1] = ycc[0];
			break;
		case SCOPES_WAVEFRM_YCC_JPEG:
		case SCOPES_WAVEFRM_YCC_709:
		case SCOPES_WAVEFRM_YCC_601:
			scopes->waveform_1[idx + 0] = fx;
			scopes->waveform_1[idx + 1] = ycc[0];
			scopes->waveform_2[idx + 0] = fx;
			scopes->waveform_2[idx + 1] = ycc[1];
			scopes->waveform_3[idx + 0] = fx;
			scopes->waveform_3[idx + 1] = ycc[2];
			break;
	}
}

void scopes_update(Scopes *scopes, ImBuf *ibuf, int use_color_management)
{
	int x, y, c;
	unsigned int n, nl;
	double div, divl;
	float *rf=NULL;
	unsigned char *rc=NULL;
	unsigned int *bin_r, *bin_g, *bin_b, *bin_lum;
	int savedlines, saveline;
	float rgb[3], ycc[3], luma;
	int ycc_mode=-1;
	const short is_float = (ibuf->rect_float != NULL);

	if (ibuf->rect==NULL && ibuf->rect_float==NULL) return;

	if (scopes->ok == 1 ) return;

	if (scopes->hist.ymax == 0.f) scopes->hist.ymax = 1.f;

	/* hmmmm */
	if (!(ELEM(ibuf->channels, 3, 4))) return;

	scopes->hist.channels = 3;
	scopes->hist.x_resolution = 256;

	switch (scopes->wavefrm_mode) {
		case SCOPES_WAVEFRM_RGB:
			ycc_mode = -1;
			break;
		case SCOPES_WAVEFRM_LUMA:
		case SCOPES_WAVEFRM_YCC_JPEG:
			ycc_mode = BLI_YCC_JFIF_0_255;
			break;
		case SCOPES_WAVEFRM_YCC_601:
			ycc_mode = BLI_YCC_ITU_BT601;
			break;
		case SCOPES_WAVEFRM_YCC_709:
			ycc_mode = BLI_YCC_ITU_BT709;
			break;
	}

	/* temp table to count pix value for histo */
	bin_r = MEM_callocN(256 * sizeof(unsigned int), "temp historgram bins");
	bin_g = MEM_callocN(256 * sizeof(unsigned int), "temp historgram bins");
	bin_b = MEM_callocN(256 * sizeof(unsigned int), "temp historgram bins");
	bin_lum = MEM_callocN(256 * sizeof(unsigned int), "temp historgram bins");

	/* convert to number of lines with logarithmic scale */
	scopes->sample_lines = (scopes->accuracy*0.01f) * (scopes->accuracy*0.01f) * ibuf->y;
	
	if (scopes->sample_full)
		scopes->sample_lines = ibuf->y;

	/* scan the image */
	savedlines=0;
	for (c=0; c<3; c++) {
		scopes->minmax[c][0]=25500.0f;
		scopes->minmax[c][1]=-25500.0f;
	}
	
	scopes->waveform_tot = ibuf->x*scopes->sample_lines;
	
	if (scopes->waveform_1)
		MEM_freeN(scopes->waveform_1);
	if (scopes->waveform_2)
		MEM_freeN(scopes->waveform_2);
	if (scopes->waveform_3)
		MEM_freeN(scopes->waveform_3);
	if (scopes->vecscope)
		MEM_freeN(scopes->vecscope);
	
	scopes->waveform_1= MEM_callocN(scopes->waveform_tot * 2 * sizeof(float), "waveform point channel 1");
	scopes->waveform_2= MEM_callocN(scopes->waveform_tot * 2 * sizeof(float), "waveform point channel 2");
	scopes->waveform_3= MEM_callocN(scopes->waveform_tot * 2 * sizeof(float), "waveform point channel 3");
	scopes->vecscope= MEM_callocN(scopes->waveform_tot * 2 * sizeof(float), "vectorscope point channel");
	
	if (is_float)
		rf = ibuf->rect_float;
	else
		rc = (unsigned char *)ibuf->rect;

	for (y = 0; y < ibuf->y; y++) {
		if (savedlines<scopes->sample_lines && y>=((savedlines)*ibuf->y)/(scopes->sample_lines+1)) {
			saveline = 1;
		}
		else {
			saveline = 0;
		}
		for (x = 0; x < ibuf->x; x++) {

			if (is_float) {
				if (use_color_management)
					linearrgb_to_srgb_v3_v3(rgb, rf);
				else
					copy_v3_v3(rgb, rf);
			}
			else {
				for (c=0; c<3; c++)
					rgb[c] = rc[c] * INV_255;
			}

			/* we still need luma for histogram */
			luma = rgb_to_luma(rgb);

			/* check for min max */
			if (ycc_mode == -1 ) {
				for (c=0; c<3; c++) {
					if (rgb[c] < scopes->minmax[c][0]) scopes->minmax[c][0] = rgb[c];
					if (rgb[c] > scopes->minmax[c][1]) scopes->minmax[c][1] = rgb[c];
				}
			}
			else {
				rgb_to_ycc(rgb[0],rgb[1],rgb[2],&ycc[0],&ycc[1],&ycc[2], ycc_mode);
				for (c=0; c<3; c++) {
					ycc[c] *=INV_255;
					if (ycc[c] < scopes->minmax[c][0]) scopes->minmax[c][0] = ycc[c];
					if (ycc[c] > scopes->minmax[c][1]) scopes->minmax[c][1] = ycc[c];
				}
			}
			/* increment count for histo*/
			bin_r[ get_bin_float(rgb[0]) ] += 1;
			bin_g[ get_bin_float(rgb[1]) ] += 1;
			bin_b[ get_bin_float(rgb[2]) ] += 1;
			bin_lum[ get_bin_float(luma) ] += 1;

			/* save sample if needed */
			if (saveline) {
				const float fx = (float)x / (float)ibuf->x;
				const int idx = 2*(ibuf->x*savedlines+x);
				save_sample_line(scopes, idx, fx, rgb, ycc);
			}

			rf+= ibuf->channels;
			rc+= ibuf->channels;
		}
		if (saveline)
			savedlines +=1;
	}

	/* convert hist data to float (proportional to max count) */
	n=0;
	nl=0;
	for (x=0; x<256; x++) {
		if (bin_r[x] > n)
			n = bin_r[x];
		if (bin_g[x] > n)
			n = bin_g[x];
		if (bin_b[x] > n)
			n = bin_b[x];
		if (bin_lum[x] > nl)
			nl = bin_lum[x];
	}
	div = 1.0/(double)n;
	divl = 1.0/(double)nl;
	for (x=0; x<256; x++) {
		scopes->hist.data_r[x] = bin_r[x] * div;
		scopes->hist.data_g[x] = bin_g[x] * div;
		scopes->hist.data_b[x] = bin_b[x] * div;
		scopes->hist.data_luma[x] = bin_lum[x] * divl;
	}
	MEM_freeN(bin_r);
	MEM_freeN(bin_g);
	MEM_freeN(bin_b);
	MEM_freeN(bin_lum);

	scopes->ok = 1;
}

void scopes_free(Scopes *scopes)
{
	if (scopes->waveform_1) {
		MEM_freeN(scopes->waveform_1);
		scopes->waveform_1 = NULL;
	}
	if (scopes->waveform_2) {
		MEM_freeN(scopes->waveform_2);
		scopes->waveform_2 = NULL;
	}
	if (scopes->waveform_3) {
		MEM_freeN(scopes->waveform_3);
		scopes->waveform_3 = NULL;
	}
	if (scopes->vecscope) {
		MEM_freeN(scopes->vecscope);
		scopes->vecscope = NULL;
	}
}

void scopes_new(Scopes *scopes)
{
	scopes->accuracy=30.0;
	scopes->hist.mode=HISTO_MODE_RGB;
	scopes->wavefrm_alpha=0.3;
	scopes->vecscope_alpha=0.3;
	scopes->wavefrm_height= 100;
	scopes->vecscope_height= 100;
	scopes->hist.height= 100;
	scopes->ok= 0;
	scopes->waveform_1 = NULL;
	scopes->waveform_2 = NULL;
	scopes->waveform_3 = NULL;
	scopes->vecscope = NULL;
}