colortools.c

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/*
 * ***** 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 *****
 */

#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]);
        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));   
        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, float *rgb, float *ycc)
{
    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;
}