key.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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <math.h>
#include <string.h>
#include <stddef.h>

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_editVert.h"
#include "BLI_math_vector.h"
#include "BLI_utildefines.h"

#include "DNA_anim_types.h"
#include "DNA_key_types.h"
#include "DNA_lattice_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "BKE_animsys.h"
#include "BKE_curve.h"
#include "BKE_customdata.h"
#include "BKE_deform.h"
#include "BKE_global.h"
#include "BKE_key.h"
#include "BKE_lattice.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_object.h"
#include "BKE_deform.h"
#include "BKE_scene.h"


#include "RNA_access.h"

#define KEY_MODE_DUMMY      0 /* use where mode isn't checked for */
#define KEY_MODE_BPOINT     1
#define KEY_MODE_BEZTRIPLE  2

    // old defines from DNA_ipo_types.h for data-type
#define IPO_FLOAT       4
#define IPO_BEZTRIPLE   100
#define IPO_BPOINT      101

int slurph_opt= 1;


void free_key(Key *key)
{
    KeyBlock *kb;
    
    BKE_free_animdata((ID *)key);
    
    while( (kb= key->block.first) ) {
        
        if(kb->data) MEM_freeN(kb->data);
        
        BLI_remlink(&key->block, kb);
        MEM_freeN(kb);
    }
    
}

/* GS reads the memory pointed at in a specific ordering. There are,
 * however two definitions for it. I have jotted them down here, both,
 * but I think the first one is actually used. The thing is that
 * big-endian systems might read this the wrong way round. OTOH, we
 * constructed the IDs that are read out with this macro explicitly as
 * well. I expect we'll sort it out soon... */

/* from blendef: */
#define GS(a)   (*((short *)(a)))

/* from misc_util: flip the bytes from x  */
/*  #define GS(x) (((unsigned char *)(x))[0] << 8 | ((unsigned char *)(x))[1]) */

Key *add_key(ID *id)    /* common function */
{
    Key *key;
    char *el;
    
    key= alloc_libblock(&G.main->key, ID_KE, "Key");
    
    key->type= KEY_NORMAL;
    key->from= id;
    
    // XXX the code here uses some defines which will soon be depreceated...
    if( GS(id->name)==ID_ME) {
        el= key->elemstr;
        
        el[0]= 3;
        el[1]= IPO_FLOAT;
        el[2]= 0;
        
        key->elemsize= 12;
    }
    else if( GS(id->name)==ID_LT) {
        el= key->elemstr;
        
        el[0]= 3;
        el[1]= IPO_FLOAT;
        el[2]= 0;
        
        key->elemsize= 12;
    }
    else if( GS(id->name)==ID_CU) {
        el= key->elemstr;
        
        el[0]= 4;
        el[1]= IPO_BPOINT;
        el[2]= 0;
        
        key->elemsize= 16;
    }
    
    return key;
}

Key *copy_key(Key *key)
{
    Key *keyn;
    KeyBlock *kbn, *kb;
    
    if(key==NULL) return NULL;
    
    keyn= copy_libblock(&key->id);
    
    BLI_duplicatelist(&keyn->block, &key->block);
    
    kb= key->block.first;
    kbn= keyn->block.first;
    while(kbn) {
        
        if(kbn->data) kbn->data= MEM_dupallocN(kbn->data);
        if(kb==key->refkey) keyn->refkey= kbn;
        
        kbn= kbn->next;
        kb= kb->next;
    }
    
    return keyn;
}

void make_local_key(Key *key)
{

    /* - only lib users: do nothing
    * - only local users: set flag
    * - mixed: make copy
    */
    if(key==NULL) return;
    
    key->id.lib= NULL;
    new_id(NULL, &key->id, NULL);
}

/* Sort shape keys and Ipo curves after a change.  This assumes that at most
 * one key was moved, which is a valid assumption for the places it's
 * currently being called.
 */

void sort_keys(Key *key)
{
    KeyBlock *kb;
    //short i, adrcode;
    //IpoCurve *icu = NULL;
    KeyBlock *kb2;

    /* locate the key which is out of position */ 
    for (kb= key->block.first; kb; kb= kb->next)
        if ((kb->next) && (kb->pos > kb->next->pos))
            break;

    /* if we find a key, move it */
    if (kb) {
        kb = kb->next; /* next key is the out-of-order one */
        BLI_remlink(&key->block, kb);
        
        /* find the right location and insert before */
        for (kb2=key->block.first; kb2; kb2= kb2->next) {
            if (kb2->pos > kb->pos) {
                BLI_insertlink(&key->block, kb2->prev, kb);
                break;
            }
        }
        
        /* if more than one Ipo curve, see if this key had a curve */
#if 0 // XXX old animation system
        if(key->ipo && key->ipo->curve.first != key->ipo->curve.last ) {
            for(icu= key->ipo->curve.first; icu; icu= icu->next) {
                /* if we find the curve, remove it and reinsert in the 
                 right place */
                if(icu->adrcode==kb->adrcode) {
                    IpoCurve *icu2;
                    BLI_remlink(&key->ipo->curve, icu);
                    for(icu2= key->ipo->curve.first; icu2; icu2= icu2->next) {
                        if(icu2->adrcode >= kb2->adrcode) {
                            BLI_insertlink(&key->ipo->curve, icu2->prev, icu);
                            break;
                        }
                    }
                    break;
                }
            }
        }
        
        /* kb points at the moved key, icu at the moved ipo (if it exists).
         * go back now and renumber adrcodes */

        /* first new code */
        adrcode = kb2->adrcode;
        for (i = kb->adrcode - adrcode; i >= 0; i--, adrcode++) {
            /* if the next ipo curve matches the current key, renumber it */
            if(icu && icu->adrcode == kb->adrcode ) {
                icu->adrcode = adrcode;
                icu = icu->next;
            }
            /* renumber the shape key */
            kb->adrcode = adrcode;
            kb = kb->next;
        }
#endif // XXX old animation system
    }

    /* new rule; first key is refkey, this to match drawing channels... */
    key->refkey= key->block.first;
}

/**************** do the key ****************/

void key_curve_position_weights(float t, float *data, int type)
{
    float t2, t3, fc;
    
    if(type==KEY_LINEAR) {
        data[0]=          0.0f;
        data[1]= -t     + 1.0f;
        data[2]= t;
        data[3]=          0.0f;
    }
    else if(type==KEY_CARDINAL) {
        t2= t*t;
        t3= t2*t;
        fc= 0.71f;
        
        data[0]= -fc*t3         + 2.0f*fc*t2        - fc*t;
        data[1]= (2.0f-fc)*t3   + (fc-3.0f)*t2                  + 1.0f;
        data[2]= (fc-2.0f)*t3   + (3.0f-2.0f*fc)*t2 + fc*t;
        data[3]= fc*t3          - fc*t2;
    }
    else if(type==KEY_BSPLINE) {
        t2= t*t;
        t3= t2*t;

        data[0]= -0.16666666f*t3    + 0.5f*t2   - 0.5f*t    + 0.16666666f;
        data[1]= 0.5f*t3            - t2                    + 0.6666666f;
        data[2]= -0.5f*t3           + 0.5f*t2   + 0.5f*t    + 0.16666666f;
        data[3]= 0.16666666f*t3;
    }
}

/* first derivative */
void key_curve_tangent_weights(float t, float *data, int type)
{
    float t2, fc;
    
    if(type==KEY_LINEAR) {
        data[0]= 0.0f;
        data[1]= -1.0f;
        data[2]= 1.0f;
        data[3]= 0.0f;
    }
    else if(type==KEY_CARDINAL) {
        t2= t*t;
        fc= 0.71f;
        
        data[0]= -3.0f*fc*t2        +4.0f*fc*t              - fc;
        data[1]= 3.0f*(2.0f-fc)*t2  +2.0f*(fc-3.0f)*t;
        data[2]= 3.0f*(fc-2.0f)*t2  +2.0f*(3.0f-2.0f*fc)*t  + fc;
        data[3]= 3.0f*fc*t2         -2.0f*fc*t;
    }
    else if(type==KEY_BSPLINE) {
        t2= t*t;

        data[0]= -0.5f*t2   + t         - 0.5f;
        data[1]= 1.5f*t2    - 2.0f*t;
        data[2]= -1.5f*t2   + t         + 0.5f;
        data[3]= 0.5f*t2;
    }
}

/* second derivative */
void key_curve_normal_weights(float t, float *data, int type)
{
    float fc;
    
    if(type==KEY_LINEAR) {
        data[0]= 0.0f;
        data[1]= 0.0f;
        data[2]= 0.0f;
        data[3]= 0.0f;
    }
    else if(type==KEY_CARDINAL) {
        fc= 0.71f;
        
        data[0]= -6.0f*fc*t         + 4.0f*fc;
        data[1]= 6.0f*(2.0f-fc)*t   + 2.0f*(fc-3.0f);
        data[2]= 6.0f*(fc-2.0f)*t   + 2.0f*(3.0f-2.0f*fc);
        data[3]= 6.0f*fc*t          - 2.0f*fc;
    }
    else if(type==KEY_BSPLINE) {
        data[0]= -1.0f*t    + 1.0f;
        data[1]= 3.0f*t     - 2.0f;
        data[2]= -3.0f*t    + 1.0f;
        data[3]= 1.0f*t;
    }
}

static int setkeys(float fac, ListBase *lb, KeyBlock *k[], float *t, int cycl)
{
    /* return 1 means k[2] is the position, return 0 means interpolate */
    KeyBlock *k1, *firstkey;
    float d, dpos, ofs=0, lastpos, temp, fval[4];
    short bsplinetype;

    firstkey= lb->first;
    k1= lb->last;
    lastpos= k1->pos;
    dpos= lastpos - firstkey->pos;

    if(fac < firstkey->pos) fac= firstkey->pos;
    else if(fac > k1->pos) fac= k1->pos;

    k1=k[0]=k[1]=k[2]=k[3]= firstkey;
    t[0]=t[1]=t[2]=t[3]= k1->pos;

    /* if(fac<0.0 || fac>1.0) return 1; */

    if(k1->next==NULL) return 1;

    if(cycl) {  /* pre-sort */
        k[2]= k1->next;
        k[3]= k[2]->next;
        if(k[3]==NULL) k[3]=k1;
        while(k1) {
            if(k1->next==NULL) k[0]=k1;
            k1=k1->next;
        }
        k1= k[1];
        t[0]= k[0]->pos;
        t[1]+= dpos;
        t[2]= k[2]->pos + dpos;
        t[3]= k[3]->pos + dpos;
        fac+= dpos;
        ofs= dpos;
        if(k[3]==k[1]) { 
            t[3]+= dpos; 
            ofs= 2.0f*dpos;
        }
        if(fac<t[1]) fac+= dpos;
        k1= k[3];
    }
    else {      /* pre-sort */
        k[2]= k1->next;
        t[2]= k[2]->pos;
        k[3]= k[2]->next;
        if(k[3]==NULL) k[3]= k[2];
        t[3]= k[3]->pos;
        k1= k[3];
    }
    
    while( t[2]<fac ) { /* find correct location */
        if(k1->next==NULL) {
            if(cycl) {
                k1= firstkey;
                ofs+= dpos;
            }
            else if(t[2]==t[3]) break;
        }
        else k1= k1->next;

        t[0]= t[1]; 
        k[0]= k[1];
        t[1]= t[2]; 
        k[1]= k[2];
        t[2]= t[3]; 
        k[2]= k[3];
        t[3]= k1->pos+ofs; 
        k[3]= k1;

        if(ofs > 2.1f + lastpos) break;
    }
    
    bsplinetype= 0;
    if(k[1]->type==KEY_BSPLINE || k[2]->type==KEY_BSPLINE) bsplinetype= 1;


    if(cycl==0) {
        if(bsplinetype==0) {    /* B spline doesn't go through the control points */
            if(fac<=t[1]) {     /* fac for 1st key */
                t[2]= t[1];
                k[2]= k[1];
                return 1;
            }
            if(fac>=t[2] ) {    /* fac after 2nd key */
                return 1;
            }
        }
        else if(fac>t[2]) { /* last key */
            fac= t[2];
            k[3]= k[2];
            t[3]= t[2];
        }
    }

    d= t[2]-t[1];
    if(d == 0.0f) {
        if(bsplinetype==0) {
            return 1;   /* both keys equal */
        }
    }
    else d= (fac-t[1])/d;

    /* interpolation */
    
    key_curve_position_weights(d, t, k[1]->type);

    if(k[1]->type != k[2]->type) {
        key_curve_position_weights(d, fval, k[2]->type);
        
        temp= 1.0f-d;
        t[0]= temp*t[0]+ d*fval[0];
        t[1]= temp*t[1]+ d*fval[1];
        t[2]= temp*t[2]+ d*fval[2];
        t[3]= temp*t[3]+ d*fval[3];
    }

    return 0;

}

static void flerp(int tot, float *in, float *f0, float *f1, float *f2, float *f3, float *t)
{
    int a;

    for(a=0; a<tot; a++) {
        in[a]= t[0]*f0[a]+t[1]*f1[a]+t[2]*f2[a]+t[3]*f3[a];
    }
}

static void rel_flerp(int tot, float *in, float *ref, float *out, float fac)
{
    int a;
    
    for(a=0; a<tot; a++) {
        in[a]-= fac*(ref[a]-out[a]);
    }
}

static char *key_block_get_data(Key *key, KeyBlock *actkb, KeyBlock *kb, char **freedata)
{
    if(kb == actkb) {
        /* this hack makes it possible to edit shape keys in
           edit mode with shape keys blending applied */
        if(GS(key->from->name) == ID_ME) {
            Mesh *me;
            EditVert *eve;
            float (*co)[3];
            int a;

            me= (Mesh*)key->from;

            if(me->edit_mesh && me->edit_mesh->totvert == kb->totelem) {
                a= 0;
                co= MEM_callocN(sizeof(float)*3*me->edit_mesh->totvert, "key_block_get_data");

                for(eve=me->edit_mesh->verts.first; eve; eve=eve->next, a++)
                    copy_v3_v3(co[a], eve->co);

                *freedata= (char*)co;
                return (char*)co;
            }
        }
    }

    *freedata= NULL;
    return kb->data;
}


/* currently only the first value of 'ofs' may be set. */
static short key_pointer_size(const Key *key, const int mode, int *poinsize, int *ofs)
{
    if(key->from==NULL) {
        return FALSE;
    }

    switch(GS(key->from->name)) {
    case ID_ME:
        *ofs= sizeof(float)*3;
        *poinsize= *ofs;
        break;
    case ID_LT:
        *ofs= sizeof(float)*3;
        *poinsize= *ofs;
        break;
    case ID_CU:
        if(mode == KEY_MODE_BPOINT) {
            *ofs= sizeof(float)*4;
            *poinsize= *ofs;
        } else {
            ofs[0]= sizeof(float)*12;
            *poinsize= (*ofs) / 3;
        }

        break;
    default:
        BLI_assert(!"invalid 'key->from' ID type");
        return FALSE;
    }

    return TRUE;
}

static void cp_key(const int start, int end, const int tot, char *poin, Key *key, KeyBlock *actkb, KeyBlock *kb, float *weights, const int mode)
{
    float ktot = 0.0, kd = 0.0;
    int elemsize, poinsize = 0, a, *ofsp, ofs[32], flagflo=0;
    char *k1, *kref, *freek1, *freekref;
    char *cp, elemstr[8];

    /* currently always 0, in future key_pointer_size may assign */
    ofs[1]= 0;

    if(!key_pointer_size(key, mode, &poinsize, &ofs[0]))
        return;

    if(end>tot) end= tot;
    
    if(tot != kb->totelem) {
        ktot= 0.0;
        flagflo= 1;
        if(kb->totelem) {
            kd= kb->totelem/(float)tot;
        }
        else return;
    }

    k1= key_block_get_data(key, actkb, kb, &freek1);
    kref= key_block_get_data(key, actkb, key->refkey, &freekref);

    /* this exception is needed for slurphing */
    if(start!=0) {
        
        poin+= poinsize*start;
        
        if(flagflo) {
            ktot+= start*kd;
            a= (int)floor(ktot);
            if(a) {
                ktot-= a;
                k1+= a*key->elemsize;
            }
        }
        else k1+= start*key->elemsize;
    }   
    
    if(mode == KEY_MODE_BEZTRIPLE) {
        elemstr[0]= 1;
        elemstr[1]= IPO_BEZTRIPLE;
        elemstr[2]= 0;
    }
    
    /* just do it here, not above! */
    elemsize= key->elemsize;
    if(mode == KEY_MODE_BEZTRIPLE) elemsize*= 3;

    for(a=start; a<end; a++) {
        cp= key->elemstr;
        if(mode == KEY_MODE_BEZTRIPLE) cp= elemstr;

        ofsp= ofs;
        
        while( cp[0] ) {
            
            switch(cp[1]) {
            case IPO_FLOAT:
                if(weights) {
                    memcpy(poin, kref, sizeof(float)*3);
                    if(*weights!=0.0f)
                        rel_flerp(cp[0], (float *)poin, (float *)kref, (float *)k1, *weights);
                    weights++;
                }
                else 
                    memcpy(poin, k1, sizeof(float)*3);
                break;
            case IPO_BPOINT:
                memcpy(poin, k1, sizeof(float)*4);
                break;
            case IPO_BEZTRIPLE:
                memcpy(poin, k1, sizeof(float)*12);
                break;
            default:
                /* should never happen */
                if(freek1) MEM_freeN(freek1);
                if(freekref) MEM_freeN(freekref);
                BLI_assert(!"invalid 'cp[1]'");
                return;
            }

            poin+= ofsp[0]; 
            cp+= 2; ofsp++;
        }
        
        /* are we going to be nasty? */
        if(flagflo) {
            ktot+= kd;
            while(ktot >= 1.0f) {
                ktot -= 1.0f;
                k1+= elemsize;
                kref+= elemsize;
            }
        }
        else {
            k1+= elemsize;
            kref+= elemsize;
        }
        
        if(mode == KEY_MODE_BEZTRIPLE) a+=2;
    }

    if(freek1) MEM_freeN(freek1);
    if(freekref) MEM_freeN(freekref);
}

static void cp_cu_key(Curve *cu, Key *key, KeyBlock *actkb, KeyBlock *kb, const int start, int end, char *out, const int tot)
{
    Nurb *nu;
    int a, step, a1, a2;

    for(a=0, nu=cu->nurb.first; nu; nu=nu->next, a+=step) {
        if(nu->bp) {
            step= nu->pntsu*nu->pntsv;

            a1= MAX2(a, start);
            a2= MIN2(a+step, end);

            if(a1<a2) cp_key(a1, a2, tot, out, key, actkb, kb, NULL, KEY_MODE_BPOINT);
        }
        else if(nu->bezt) {
            step= 3*nu->pntsu;

            /* exception because keys prefer to work with complete blocks */
            a1= MAX2(a, start);
            a2= MIN2(a+step, end);

            if(a1<a2) cp_key(a1, a2, tot, out, key, actkb, kb, NULL, KEY_MODE_BEZTRIPLE);
        }
        else
            step= 0;
    }
}

void do_rel_key(const int start, int end, const int tot, char *basispoin, Key *key, KeyBlock *actkb, const int mode)
{
    KeyBlock *kb;
    int *ofsp, ofs[3], elemsize, b;
    char *cp, *poin, *reffrom, *from, elemstr[8];
    char *freefrom, *freereffrom;
    int poinsize;

    /* currently always 0, in future key_pointer_size may assign */
    ofs[1]= 0;

    if(!key_pointer_size(key, mode, &poinsize, &ofs[0]))
        return;

    if(end>tot) end= tot;

    /* in case of beztriple */
    elemstr[0]= 1;              /* nr of ipofloats */
    elemstr[1]= IPO_BEZTRIPLE;
    elemstr[2]= 0;

    /* just here, not above! */
    elemsize= key->elemsize;
    if(mode == KEY_MODE_BEZTRIPLE) elemsize*= 3;

    /* step 1 init */
    cp_key(start, end, tot, basispoin, key, actkb, key->refkey, NULL, mode);
    
    /* step 2: do it */
    
    for(kb=key->block.first; kb; kb=kb->next) {
        if(kb!=key->refkey) {
            float icuval= kb->curval;
            
            /* only with value, and no difference allowed */
            if(!(kb->flag & KEYBLOCK_MUTE) && icuval!=0.0f && kb->totelem==tot) {
                KeyBlock *refb;
                float weight, *weights= kb->weights;

                /* reference now can be any block */
                refb= BLI_findlink(&key->block, kb->relative);
                if(refb==NULL) continue;
                
                poin= basispoin;
                from= key_block_get_data(key, actkb, kb, &freefrom);
                reffrom= key_block_get_data(key, actkb, refb, &freereffrom);
                
                poin+= start*poinsize;
                reffrom+= key->elemsize*start;  // key elemsize yes!
                from+= key->elemsize*start;
                
                for(b=start; b<end; b++) {
                
                    if(weights) 
                        weight= *weights * icuval;
                    else
                        weight= icuval;
                    
                    cp= key->elemstr;   
                    if(mode == KEY_MODE_BEZTRIPLE) cp= elemstr;
                    
                    ofsp= ofs;
                    
                    while( cp[0] ) {    /* cp[0]==amount */
                        
                        switch(cp[1]) {
                        case IPO_FLOAT:
                            rel_flerp(3, (float *)poin, (float *)reffrom, (float *)from, weight);
                            break;
                        case IPO_BPOINT:
                            rel_flerp(4, (float *)poin, (float *)reffrom, (float *)from, weight);
                            break;
                        case IPO_BEZTRIPLE:
                            rel_flerp(12, (float *)poin, (float *)reffrom, (float *)from, weight);
                            break;
                        default:
                            /* should never happen */
                            if(freefrom) MEM_freeN(freefrom);
                            if(freereffrom) MEM_freeN(freereffrom);
                            BLI_assert(!"invalid 'cp[1]'");
                            return;
                        }

                        poin+= ofsp[0];             
                        
                        cp+= 2;
                        ofsp++;
                    }
                    
                    reffrom+= elemsize;
                    from+= elemsize;
                    
                    if(mode == KEY_MODE_BEZTRIPLE) b+= 2;
                    if(weights) weights++;
                }

                if(freefrom) MEM_freeN(freefrom);
                if(freereffrom) MEM_freeN(freereffrom);
            }
        }
    }
}


static void do_key(const int start, int end, const int tot, char *poin, Key *key, KeyBlock *actkb, KeyBlock **k, float *t, const int mode)
{
    float k1tot = 0.0, k2tot = 0.0, k3tot = 0.0, k4tot = 0.0;
    float k1d = 0.0, k2d = 0.0, k3d = 0.0, k4d = 0.0;
    int a, ofs[32], *ofsp;
    int flagdo= 15, flagflo=0, elemsize, poinsize=0;
    char *k1, *k2, *k3, *k4, *freek1, *freek2, *freek3, *freek4;
    char *cp, elemstr[8];

    /* currently always 0, in future key_pointer_size may assign */
    ofs[1]= 0;

    if(!key_pointer_size(key, mode, &poinsize, &ofs[0]))
        return;
    
    if(end>tot) end= tot;

    k1= key_block_get_data(key, actkb, k[0], &freek1);
    k2= key_block_get_data(key, actkb, k[1], &freek2);
    k3= key_block_get_data(key, actkb, k[2], &freek3);
    k4= key_block_get_data(key, actkb, k[3], &freek4);

    /*  test for more or less points (per key!) */
    if(tot != k[0]->totelem) {
        k1tot= 0.0;
        flagflo |= 1;
        if(k[0]->totelem) {
            k1d= k[0]->totelem/(float)tot;
        }
        else flagdo -= 1;
    }
    if(tot != k[1]->totelem) {
        k2tot= 0.0;
        flagflo |= 2;
        if(k[0]->totelem) {
            k2d= k[1]->totelem/(float)tot;
        }
        else flagdo -= 2;
    }
    if(tot != k[2]->totelem) {
        k3tot= 0.0;
        flagflo |= 4;
        if(k[0]->totelem) {
            k3d= k[2]->totelem/(float)tot;
        }
        else flagdo -= 4;
    }
    if(tot != k[3]->totelem) {
        k4tot= 0.0;
        flagflo |= 8;
        if(k[0]->totelem) {
            k4d= k[3]->totelem/(float)tot;
        }
        else flagdo -= 8;
    }

        /* this exception needed for slurphing */
    if(start!=0) {

        poin+= poinsize*start;
        
        if(flagdo & 1) {
            if(flagflo & 1) {
                k1tot+= start*k1d;
                a= (int)floor(k1tot);
                if(a) {
                    k1tot-= a;
                    k1+= a*key->elemsize;
                }
            }
            else k1+= start*key->elemsize;
        }
        if(flagdo & 2) {
            if(flagflo & 2) {
                k2tot+= start*k2d;
                a= (int)floor(k2tot);
                if(a) {
                    k2tot-= a;
                    k2+= a*key->elemsize;
                }
            }
            else k2+= start*key->elemsize;
        }
        if(flagdo & 4) {
            if(flagflo & 4) {
                k3tot+= start*k3d;
                a= (int)floor(k3tot);
                if(a) {
                    k3tot-= a;
                    k3+= a*key->elemsize;
                }
            }
            else k3+= start*key->elemsize;
        }
        if(flagdo & 8) {
            if(flagflo & 8) {
                k4tot+= start*k4d;
                a= (int)floor(k4tot);
                if(a) {
                    k4tot-= a;
                    k4+= a*key->elemsize;
                }
            }
            else k4+= start*key->elemsize;
        }

    }

    /* in case of beztriple */
    elemstr[0]= 1;              /* nr of ipofloats */
    elemstr[1]= IPO_BEZTRIPLE;
    elemstr[2]= 0;

    /* only here, not above! */
    elemsize= key->elemsize;
    if(mode == KEY_MODE_BEZTRIPLE) elemsize*= 3;

    for(a=start; a<end; a++) {
    
        cp= key->elemstr;   
        if(mode == KEY_MODE_BEZTRIPLE) cp= elemstr;
        
        ofsp= ofs;
        
        while( cp[0] ) {    /* cp[0]==amount */
            
            switch(cp[1]) {
            case IPO_FLOAT:
                flerp(3, (float *)poin, (float *)k1, (float *)k2, (float *)k3, (float *)k4, t);
                break;
            case IPO_BPOINT:
                flerp(4, (float *)poin, (float *)k1, (float *)k2, (float *)k3, (float *)k4, t);
                break;
            case IPO_BEZTRIPLE:
                flerp(12, (void *)poin, (void *)k1, (void *)k2, (void *)k3, (void *)k4, t);
                break;
            default:
                /* should never happen */
                if(freek1) MEM_freeN(freek1);
                if(freek2) MEM_freeN(freek2);
                if(freek3) MEM_freeN(freek3);
                if(freek4) MEM_freeN(freek4);
                BLI_assert(!"invalid 'cp[1]'");
                return;
            }
            
            poin+= ofsp[0];             
            cp+= 2;
            ofsp++;
        }
        /* lets do it the difficult way: when keys have a different size */
        if(flagdo & 1) {
            if(flagflo & 1) {
                k1tot+= k1d;
                while(k1tot >= 1.0f) {
                    k1tot -= 1.0f;
                    k1+= elemsize;
                }
            }
            else k1+= elemsize;
        }
        if(flagdo & 2) {
            if(flagflo & 2) {
                k2tot+= k2d;
                while(k2tot >= 1.0f) {
                    k2tot -= 1.0f;
                    k2+= elemsize;
                }
            }
            else k2+= elemsize;
        }
        if(flagdo & 4) {
            if(flagflo & 4) {
                k3tot+= k3d;
                while(k3tot >= 1.0f) {
                    k3tot -= 1.0f;
                    k3+= elemsize;
                }
            }
            else k3+= elemsize;
        }
        if(flagdo & 8) {
            if(flagflo & 8) {
                k4tot+= k4d;
                while(k4tot >= 1.0f) {
                    k4tot -= 1.0f;
                    k4+= elemsize;
                }
            }
            else k4+= elemsize;
        }
        
        if(mode == KEY_MODE_BEZTRIPLE) a+= 2;
    }

    if(freek1) MEM_freeN(freek1);
    if(freek2) MEM_freeN(freek2);
    if(freek3) MEM_freeN(freek3);
    if(freek4) MEM_freeN(freek4);
}

static float *get_weights_array(Object *ob, char *vgroup)
{
    MDeformVert *dvert= NULL;
    EditMesh *em= NULL;
    EditVert *eve;
    int totvert= 0, defgrp_index= 0;
    
    /* no vgroup string set? */
    if(vgroup[0]==0) return NULL;
    
    /* gather dvert and totvert */
    if(ob->type==OB_MESH) {
        Mesh *me= ob->data;
        dvert= me->dvert;
        totvert= me->totvert;

        if(me->edit_mesh && me->edit_mesh->totvert == totvert)
            em= me->edit_mesh;
    }
    else if(ob->type==OB_LATTICE) {
        Lattice *lt= ob->data;
        dvert= lt->dvert;
        totvert= lt->pntsu*lt->pntsv*lt->pntsw;
    }
    
    if(dvert==NULL) return NULL;
    
    /* find the group (weak loop-in-loop) */
    defgrp_index= defgroup_name_index(ob, vgroup);
    if(defgrp_index >= 0) {
        float *weights;
        int i;
        
        weights= MEM_callocN(totvert*sizeof(float), "weights");

        if(em) {
            for(i=0, eve=em->verts.first; eve; eve=eve->next, i++) {
                dvert= CustomData_em_get(&em->vdata, eve->data, CD_MDEFORMVERT);

                if(dvert) {
                    weights[i]= defvert_find_weight(dvert, defgrp_index);
                }
            }
        }
        else {
            for(i=0; i < totvert; i++, dvert++) {
                weights[i]= defvert_find_weight(dvert, defgrp_index);
            }
        }

        return weights;
    }
    return NULL;
}

static void do_mesh_key(Scene *scene, Object *ob, Key *key, char *out, const int tot)
{
    KeyBlock *k[4], *actkb= ob_get_keyblock(ob);
    float cfra, ctime, t[4], delta;
    int a, flag = 0, step;
    
    if(key->slurph && key->type!=KEY_RELATIVE ) {
        delta= key->slurph;
        delta/= tot;
        
        step= 1;
        if(tot>100 && slurph_opt) {
            step= tot/50;
            delta*= step;
            /* in do_key and cp_key the case a>tot is handled */
        }
        
        cfra= (float)scene->r.cfra;
        
        for(a=0; a<tot; a+=step, cfra+= delta) {
            
            ctime= BKE_curframe(scene);
#if 0 // XXX old animation system
            if(calc_ipo_spec(key->ipo, KEY_SPEED, &ctime)==0) {
                ctime /= 100.0;
                CLAMP(ctime, 0.0, 1.0);
            }
#endif // XXX old animation system
            // XXX for now... since speed curve cannot be directly ported yet
            ctime /= 100.0f;
            CLAMP(ctime, 0.0f, 1.0f); // XXX for compat, we use this, but this clamping was confusing
        
            flag= setkeys(ctime, &key->block, k, t, 0);

            if(flag==0)
                do_key(a, a+step, tot, (char *)out, key, actkb, k, t, KEY_MODE_DUMMY);
            else
                cp_key(a, a+step, tot, (char *)out, key, actkb, k[2], NULL, KEY_MODE_DUMMY);
        }
    }
    else {
        if(key->type==KEY_RELATIVE) {
            KeyBlock *kb;
            
            for(kb= key->block.first; kb; kb= kb->next)
                kb->weights= get_weights_array(ob, kb->vgroup);

            do_rel_key(0, tot, tot, (char *)out, key, actkb, KEY_MODE_DUMMY);
            
            for(kb= key->block.first; kb; kb= kb->next) {
                if(kb->weights) MEM_freeN(kb->weights);
                kb->weights= NULL;
            }
        }
        else {
            ctime= BKE_curframe(scene);
            
#if 0 // XXX old animation system
            if(calc_ipo_spec(key->ipo, KEY_SPEED, &ctime)==0) {
                ctime /= 100.0;
                CLAMP(ctime, 0.0, 1.0);
            }
#endif // XXX old animation system
            // XXX for now... since speed curve cannot be directly ported yet
            ctime /= 100.0f;
            CLAMP(ctime, 0.0f, 1.0f); // XXX for compat, we use this, but this clamping was confusing
            
            flag= setkeys(ctime, &key->block, k, t, 0);

            if(flag==0)
                do_key(0, tot, tot, (char *)out, key, actkb, k, t, KEY_MODE_DUMMY);
            else
                cp_key(0, tot, tot, (char *)out, key, actkb, k[2], NULL, KEY_MODE_DUMMY);
        }
    }
}

static void do_cu_key(Curve *cu, Key *key, KeyBlock *actkb, KeyBlock **k, float *t, char *out, const int tot)
{
    Nurb *nu;
    int a, step;
    
    for(a=0, nu=cu->nurb.first; nu; nu=nu->next, a+=step) {
        if(nu->bp) {
            step= nu->pntsu*nu->pntsv;
            do_key(a, a+step, tot, out, key, actkb, k, t, KEY_MODE_BPOINT);
        }
        else if(nu->bezt) {
            step= 3*nu->pntsu;
            do_key(a, a+step, tot, out, key, actkb, k, t, KEY_MODE_BEZTRIPLE);
        }
        else
            step= 0;
    }
}

static void do_rel_cu_key(Curve *cu, Key *key, KeyBlock *actkb, float UNUSED(ctime), char *out, const int tot)
{
    Nurb *nu;
    int a, step;
    
    for(a=0, nu=cu->nurb.first; nu; nu=nu->next, a+=step) {
        if(nu->bp) {
            step= nu->pntsu*nu->pntsv;
            do_rel_key(a, a+step, tot, out, key, actkb, KEY_MODE_BPOINT);
        }
        else if(nu->bezt) {
            step= 3*nu->pntsu;
            do_rel_key(a, a+step, tot, out, key, actkb, KEY_MODE_BEZTRIPLE);
        }
        else
            step= 0;
    }
}

static void do_curve_key(Scene *scene, Object *ob, Key *key, char *out, const int tot)
{
    Curve *cu= ob->data;
    KeyBlock *k[4], *actkb= ob_get_keyblock(ob);
    float cfra, ctime, t[4], delta;
    int a, flag = 0, step = 0;

    if(key->slurph  && key->type!=KEY_RELATIVE) {
        Nurb *nu;
        int mode=0, i= 0, remain= 0, estep=0, count=0;

        delta= (float)key->slurph / tot;

        step= 1;
        if(tot>100 && slurph_opt) {
            step= tot/50;
            delta*= step;
            /* in do_key and cp_key the case a>tot has been handled */
        }

        cfra= (float)scene->r.cfra;

        for(nu=cu->nurb.first; nu; nu=nu->next) {
            if(nu->bp) {
                mode= KEY_MODE_BPOINT;
                estep= nu->pntsu*nu->pntsv;
            }
            else if(nu->bezt) {
                mode= KEY_MODE_BEZTRIPLE;
                estep= 3*nu->pntsu;
            }
            else
                step= 0;

            a= 0;
            while (a < estep) {
                if (remain <= 0) {
                    cfra+= delta;
                    ctime= BKE_curframe(scene);

                    ctime /= 100.0f;
                    CLAMP(ctime, 0.0f, 1.0f); // XXX for compat, we use this, but this clamping was confusing
                    flag= setkeys(ctime, &key->block, k, t, 0);

                    remain= step;
                }

                count= MIN2(remain, estep);
                if (mode == KEY_MODE_BEZTRIPLE) {
                    count += 3 - count % 3;
                }

                if(flag==0)
                    do_key(i, i+count, tot, (char *)out, key, actkb, k, t, mode);
                else
                    cp_key(i, i+count, tot, (char *)out, key, actkb, k[2], NULL, mode);

                a += count;
                i += count;
                remain -= count;
            }
        }
    }
    else {
        
        ctime= BKE_curframe(scene);
        
        if(key->type==KEY_RELATIVE) {
            do_rel_cu_key(cu, cu->key, actkb, ctime, out, tot);
        }
        else {
#if 0 // XXX old animation system
            if(calc_ipo_spec(key->ipo, KEY_SPEED, &ctime)==0) {
                ctime /= 100.0;
                CLAMP(ctime, 0.0, 1.0);
            }
#endif // XXX old animation system
            
            flag= setkeys(ctime, &key->block, k, t, 0);
            
            if(flag==0) do_cu_key(cu, key, actkb, k, t, out, tot);
            else cp_cu_key(cu, key, actkb, k[2], 0, tot, out, tot);
        }
    }
}

static void do_latt_key(Scene *scene, Object *ob, Key *key, char *out, const int tot)
{
    Lattice *lt= ob->data;
    KeyBlock *k[4], *actkb= ob_get_keyblock(ob);
    float delta, cfra, ctime, t[4];
    int a, flag;
    
    if(key->slurph) {
        delta= key->slurph;
        delta/= (float)tot;
        
        cfra= (float)scene->r.cfra;
        
        for(a=0; a<tot; a++, cfra+= delta) {
            
            ctime= BKE_curframe(scene);
#if 0 // XXX old animation system
            if(calc_ipo_spec(key->ipo, KEY_SPEED, &ctime)==0) {
                ctime /= 100.0;
                CLAMP(ctime, 0.0, 1.0);
            }
#endif // XXX old animation system
        
            flag= setkeys(ctime, &key->block, k, t, 0);

            if(flag==0)
                do_key(a, a+1, tot, out, key, actkb, k, t, KEY_MODE_DUMMY);
            else
                cp_key(a, a+1, tot, out, key, actkb, k[2], NULL, KEY_MODE_DUMMY);
        }       
    }
    else {
        if(key->type==KEY_RELATIVE) {
            KeyBlock *kb;
            
            for(kb= key->block.first; kb; kb= kb->next)
                kb->weights= get_weights_array(ob, kb->vgroup);
            
            do_rel_key(0, tot, tot, out, key, actkb, KEY_MODE_DUMMY);
            
            for(kb= key->block.first; kb; kb= kb->next) {
                if(kb->weights) MEM_freeN(kb->weights);
                kb->weights= NULL;
            }
        }
        else {
            ctime= BKE_curframe(scene);

#if 0 // XXX old animation system
            if(calc_ipo_spec(key->ipo, KEY_SPEED, &ctime)==0) {
                ctime /= 100.0;
                CLAMP(ctime, 0.0, 1.0);
            }
#endif // XXX old animation system
            
            flag= setkeys(ctime, &key->block, k, t, 0);

            if(flag==0)
                do_key(0, tot, tot, (char *)out, key, actkb, k, t, KEY_MODE_DUMMY);
            else
                cp_key(0, tot, tot, (char *)out, key, actkb, k[2], NULL, KEY_MODE_DUMMY);
        }
    }
    
    if(lt->flag & LT_OUTSIDE) outside_lattice(lt);
}

/* returns key coordinates (+ tilt) when key applied, NULL otherwise */
float *do_ob_key(Scene *scene, Object *ob)
{
    Key *key= ob_get_key(ob);
    KeyBlock *actkb= ob_get_keyblock(ob);
    char *out;
    int tot= 0, size= 0;
    
    if(key==NULL || key->block.first==NULL)
        return NULL;

    /* compute size of output array */
    if(ob->type == OB_MESH) {
        Mesh *me= ob->data;

        tot= me->totvert;
        size= tot*3*sizeof(float);
    }
    else if(ob->type == OB_LATTICE) {
        Lattice *lt= ob->data;

        tot= lt->pntsu*lt->pntsv*lt->pntsw;
        size= tot*3*sizeof(float);
    }
    else if(ELEM(ob->type, OB_CURVE, OB_SURF)) {
        Curve *cu= ob->data;
        Nurb *nu;

        for(nu=cu->nurb.first; nu; nu=nu->next) {
            if(nu->bezt) {
                tot += 3*nu->pntsu;
                size += nu->pntsu*12*sizeof(float);
            }
            else if(nu->bp) {
                tot += nu->pntsu*nu->pntsv;
                size += nu->pntsu*nu->pntsv*12*sizeof(float);
            }
        }
    }

    /* if nothing to interpolate, cancel */
    if(tot == 0 || size == 0)
        return NULL;
    
    /* allocate array */
    out= MEM_callocN(size, "do_ob_key out");

    /* prevent python from screwing this up? anyhoo, the from pointer could be dropped */
    key->from= (ID *)ob->data;
        
    if(ob->shapeflag & OB_SHAPE_LOCK) {
        /* shape locked, copy the locked shape instead of blending */
        KeyBlock *kb= BLI_findlink(&key->block, ob->shapenr-1);
        
        if(kb && (kb->flag & KEYBLOCK_MUTE))
            kb= key->refkey;

        if(kb==NULL) {
            kb= key->block.first;
            ob->shapenr= 1;
        }
        
        if (OB_TYPE_SUPPORT_VGROUP(ob->type)) {
            float *weights= get_weights_array(ob, kb->vgroup);

            cp_key(0, tot, tot, out, key, actkb, kb, weights, 0);

            if(weights) MEM_freeN(weights);
        }
        else if(ELEM(ob->type, OB_CURVE, OB_SURF))
            cp_cu_key(ob->data, key, actkb, kb, 0, tot, out, tot);
    }
    else {
        /* do shapekey local drivers */
        float ctime= (float)scene->r.cfra; // XXX this needs to be checked
        
        BKE_animsys_evaluate_animdata(scene, &key->id, key->adt, ctime, ADT_RECALC_DRIVERS);
        
        if(ob->type==OB_MESH) do_mesh_key(scene, ob, key, out, tot);
        else if(ob->type==OB_LATTICE) do_latt_key(scene, ob, key, out, tot);
        else if(ob->type==OB_CURVE) do_curve_key(scene, ob, key, out, tot);
        else if(ob->type==OB_SURF) do_curve_key(scene, ob, key, out, tot);
    }
    
    return (float*)out;
}

Key *ob_get_key(Object *ob)
{
    if(ob==NULL) return NULL;
    
    if(ob->type==OB_MESH) {
        Mesh *me= ob->data;
        return me->key;
    }
    else if ELEM(ob->type, OB_CURVE, OB_SURF) {
        Curve *cu= ob->data;
        return cu->key;
    }
    else if(ob->type==OB_LATTICE) {
        Lattice *lt= ob->data;
        return lt->key;
    }
    return NULL;
}

KeyBlock *add_keyblock(Key *key, const char *name)
{
    KeyBlock *kb;
    float curpos= -0.1;
    int tot;
    
    kb= key->block.last;
    if(kb) curpos= kb->pos;
    
    kb= MEM_callocN(sizeof(KeyBlock), "Keyblock");
    BLI_addtail(&key->block, kb);
    kb->type= KEY_CARDINAL;
    
    tot= BLI_countlist(&key->block);
    if(name) {
        BLI_strncpy(kb->name, name, sizeof(kb->name));
    } else {
        if(tot==1) BLI_strncpy(kb->name, "Basis", sizeof(kb->name));
        else BLI_snprintf(kb->name, sizeof(kb->name), "Key %d", tot-1);
    }

    BLI_uniquename(&key->block, kb, "Key", '.', offsetof(KeyBlock, name), sizeof(kb->name));

    // XXX this is old anim system stuff? (i.e. the 'index' of the shapekey)
    kb->adrcode= tot-1;
    
    key->totkey++;
    if(key->totkey==1) key->refkey= kb;
    
    kb->slidermin= 0.0f;
    kb->slidermax= 1.0f;
    
    // XXX kb->pos is the confusing old horizontal-line RVK crap in old IPO Editor...
    if(key->type == KEY_RELATIVE) 
        kb->pos= curpos + 0.1f;
    else {
#if 0 // XXX old animation system
        curpos= BKE_curframe(scene);
        if(calc_ipo_spec(key->ipo, KEY_SPEED, &curpos)==0) {
            curpos /= 100.0;
        }
        kb->pos= curpos;
        
        sort_keys(key);
#endif // XXX old animation system
    }
    return kb;
}

/* only the active keyblock */
KeyBlock *ob_get_keyblock(Object *ob) 
{
    Key *key= ob_get_key(ob);
    
    if (key) {
        KeyBlock *kb= BLI_findlink(&key->block, ob->shapenr-1);
        return kb;
    }

    return NULL;
}

KeyBlock *ob_get_reference_keyblock(Object *ob)
{
    Key *key= ob_get_key(ob);
    
    if (key)
        return key->refkey;

    return NULL;
}

/* get the appropriate KeyBlock given an index */
KeyBlock *key_get_keyblock(Key *key, int index)
{
    KeyBlock *kb;
    int i;
    
    if (key) {
        kb= key->block.first;
        
        for (i= 1; i < key->totkey; i++) {
            kb= kb->next;
            
            if (index==i)
                return kb;
        }
    }
    
    return NULL;
}

/* get the appropriate KeyBlock given a name to search for */
KeyBlock *key_get_named_keyblock(Key *key, const char name[])
{
    if (key && name)
        return BLI_findstring(&key->block, name, offsetof(KeyBlock, name));
    
    return NULL;
}

/* Get RNA-Path for 'value' setting of the given ShapeKey 
 * NOTE: the user needs to free the returned string once they're finishe with it
 */
char *key_get_curValue_rnaPath(Key *key, KeyBlock *kb)
{
    PointerRNA ptr;
    PropertyRNA *prop;
    
    /* sanity checks */
    if ELEM(NULL, key, kb)
        return NULL;
    
    /* create the RNA pointer */
    RNA_pointer_create(&key->id, &RNA_ShapeKey, kb, &ptr);
    /* get pointer to the property too */
    prop= RNA_struct_find_property(&ptr, "value");
    
    /* return the path */
    return RNA_path_from_ID_to_property(&ptr, prop);
}


/* conversion functions */

/************************* Lattice ************************/
void latt_to_key(Lattice *lt, KeyBlock *kb)
{
    BPoint *bp;
    float *fp;
    int a, tot;

    tot= lt->pntsu*lt->pntsv*lt->pntsw;
    if(tot==0) return;

    if(kb->data) MEM_freeN(kb->data);

    kb->data= MEM_callocN(lt->key->elemsize*tot, "kb->data");
    kb->totelem= tot;

    bp= lt->def;
    fp= kb->data;
    for(a=0; a<kb->totelem; a++, fp+=3, bp++) {
        copy_v3_v3(fp, bp->vec);
    }
}

void key_to_latt(KeyBlock *kb, Lattice *lt)
{
    BPoint *bp;
    float *fp;
    int a, tot;

    bp= lt->def;
    fp= kb->data;

    tot= lt->pntsu*lt->pntsv*lt->pntsw;
    tot= MIN2(kb->totelem, tot);

    for(a=0; a<tot; a++, fp+=3, bp++) {
        copy_v3_v3(bp->vec, fp);
    }
}

/************************* Curve ************************/
void curve_to_key(Curve *cu, KeyBlock *kb, ListBase *nurb)
{
    Nurb *nu;
    BezTriple *bezt;
    BPoint *bp;
    float *fp;
    int a, tot;

    /* count */
    tot= count_curveverts(nurb);
    if(tot==0) return;

    if(kb->data) MEM_freeN(kb->data);

    kb->data= MEM_callocN(cu->key->elemsize*tot, "kb->data");
    kb->totelem= tot;

    nu= nurb->first;
    fp= kb->data;
    while(nu) {

        if(nu->bezt) {
            bezt= nu->bezt;
            a= nu->pntsu;
            while(a--) {
                copy_v3_v3(fp, bezt->vec[0]);
                fp+= 3;
                copy_v3_v3(fp, bezt->vec[1]);
                fp+= 3;
                copy_v3_v3(fp, bezt->vec[2]);
                fp+= 3;
                fp[0]= bezt->alfa;
                fp+= 3; /* alphas */
                bezt++;
            }
        }
        else {
            bp= nu->bp;
            a= nu->pntsu*nu->pntsv;
            while(a--) {
                copy_v3_v3(fp, bp->vec);
                fp[3]= bp->alfa;

                fp+= 4;
                bp++;
            }
        }
        nu= nu->next;
    }
}

void key_to_curve(KeyBlock *kb, Curve *UNUSED(cu), ListBase *nurb)
{
    Nurb *nu;
    BezTriple *bezt;
    BPoint *bp;
    float *fp;
    int a, tot;

    nu= nurb->first;
    fp= kb->data;

    tot= count_curveverts(nurb);

    tot= MIN2(kb->totelem, tot);

    while(nu && tot>0) {

        if(nu->bezt) {
            bezt= nu->bezt;
            a= nu->pntsu;
            while(a-- && tot>0) {
                copy_v3_v3(bezt->vec[0], fp);
                fp+= 3;
                copy_v3_v3(bezt->vec[1], fp);
                fp+= 3;
                copy_v3_v3(bezt->vec[2], fp);
                fp+= 3;
                bezt->alfa= fp[0];
                fp+= 3; /* alphas */

                tot-= 3;
                bezt++;
            }
        }
        else {
            bp= nu->bp;
            a= nu->pntsu*nu->pntsv;
            while(a-- && tot>0) {
                copy_v3_v3(bp->vec, fp);
                bp->alfa= fp[3];

                fp+= 4;
                tot--;
                bp++;
            }
        }
        nu= nu->next;
    }
}

/************************* Mesh ************************/
void mesh_to_key(Mesh *me, KeyBlock *kb)
{
    MVert *mvert;
    float *fp;
    int a;

    if(me->totvert==0) return;

    if(kb->data) MEM_freeN(kb->data);

    kb->data= MEM_callocN(me->key->elemsize*me->totvert, "kb->data");
    kb->totelem= me->totvert;

    mvert= me->mvert;
    fp= kb->data;
    for(a=0; a<kb->totelem; a++, fp+=3, mvert++) {
        copy_v3_v3(fp, mvert->co);

    }
}

void key_to_mesh(KeyBlock *kb, Mesh *me)
{
    MVert *mvert;
    float *fp;
    int a, tot;

    mvert= me->mvert;
    fp= kb->data;

    tot= MIN2(kb->totelem, me->totvert);

    for(a=0; a<tot; a++, fp+=3, mvert++) {
        copy_v3_v3(mvert->co, fp);
    }
}

/************************* vert coords ************************/
float (*key_to_vertcos(Object *ob, KeyBlock *kb))[3]
{
    float (*vertCos)[3], *co;
    float *fp= kb->data;
    int tot= 0, a;

    /* Count of vertex coords in array */
    if(ob->type == OB_MESH) {
        Mesh *me= (Mesh*)ob->data;
        tot= me->totvert;
    } else if(ob->type == OB_LATTICE) {
        Lattice *lt= (Lattice*)ob->data;
        tot= lt->pntsu*lt->pntsv*lt->pntsw;
    } else if(ELEM(ob->type, OB_CURVE, OB_SURF)) {
        Curve *cu= (Curve*)ob->data;
        tot= count_curveverts(&cu->nurb);
    }

    if (tot == 0) return NULL;

    vertCos= MEM_callocN(tot*sizeof(*vertCos), "key_to_vertcos vertCos");

    /* Copy coords to array */
    co= (float*)vertCos;

    if(ELEM(ob->type, OB_MESH, OB_LATTICE)) {
        for (a= 0; a<tot; a++, fp+=3, co+=3) {
            copy_v3_v3(co, fp);
        }
    } else if(ELEM(ob->type, OB_CURVE, OB_SURF)) {
        Curve *cu= (Curve*)ob->data;
        Nurb *nu= cu->nurb.first;
        BezTriple *bezt;
        BPoint *bp;

        while (nu) {
            if(nu->bezt) {
                int i;
                bezt= nu->bezt;
                a= nu->pntsu;

                while (a--) {
                    for (i= 0; i<3; i++) {
                        copy_v3_v3(co, fp);
                        fp+= 3; co+= 3;
                    }

                    fp+= 3; /* skip alphas */

                    bezt++;
                }
            }
            else {
                bp= nu->bp;
                a= nu->pntsu*nu->pntsv;

                while (a--) {
                    copy_v3_v3(co, fp);

                    fp+= 4;
                    co+= 3;

                    bp++;
                }
            }

            nu= nu->next;
        }
    }

    return vertCos;
}

void vertcos_to_key(Object *ob, KeyBlock *kb, float (*vertCos)[3])
{
    float *co= (float*)vertCos, *fp;
    int tot= 0, a, elemsize;

    if (kb->data) MEM_freeN(kb->data);

    /* Count of vertex coords in array */
    if(ob->type == OB_MESH) {
        Mesh *me= (Mesh*)ob->data;
        tot= me->totvert;
        elemsize= me->key->elemsize;
    } else if(ob->type == OB_LATTICE) {
        Lattice *lt= (Lattice*)ob->data;
        tot= lt->pntsu*lt->pntsv*lt->pntsw;
        elemsize= lt->key->elemsize;
    } else if(ELEM(ob->type, OB_CURVE, OB_SURF)) {
        Curve *cu= (Curve*)ob->data;
        elemsize= cu->key->elemsize;
        tot= count_curveverts(&cu->nurb);
    }

    if (tot == 0) {
        kb->data= NULL;
        return;
    }

    fp= kb->data= MEM_callocN(tot*elemsize, "key_to_vertcos vertCos");

    /* Copy coords to keyblock */

    if(ELEM(ob->type, OB_MESH, OB_LATTICE)) {
        for (a= 0; a<tot; a++, fp+=3, co+=3) {
            copy_v3_v3(fp, co);
        }
    } else if(ELEM(ob->type, OB_CURVE, OB_SURF)) {
        Curve *cu= (Curve*)ob->data;
        Nurb *nu= cu->nurb.first;
        BezTriple *bezt;
        BPoint *bp;

        while (nu) {
            if(nu->bezt) {
                int i;
                bezt= nu->bezt;
                a= nu->pntsu;

                while (a--) {
                    for (i= 0; i<3; i++) {
                        copy_v3_v3(fp, co);
                        fp+= 3; co+= 3;
                    }

                    fp+= 3; /* skip alphas */

                    bezt++;
                }
            }
            else {
                bp= nu->bp;
                a= nu->pntsu*nu->pntsv;

                while (a--) {
                    copy_v3_v3(fp, co);

                    fp+= 4;
                    co+= 3;

                    bp++;
                }
            }

            nu= nu->next;
        }
    }
}

void offset_to_key(Object *ob, KeyBlock *kb, float (*ofs)[3])
{
    int a;
    float *co= (float*)ofs, *fp= kb->data;

    if(ELEM(ob->type, OB_MESH, OB_LATTICE)) {
        for (a= 0; a<kb->totelem; a++, fp+=3, co+=3) {
            add_v3_v3(fp, co);
        }
    } else if(ELEM(ob->type, OB_CURVE, OB_SURF)) {
        Curve *cu= (Curve*)ob->data;
        Nurb *nu= cu->nurb.first;
        BezTriple *bezt;
        BPoint *bp;

        while (nu) {
            if(nu->bezt) {
                int i;
                bezt= nu->bezt;
                a= nu->pntsu;

                while (a--) {
                    for (i= 0; i<3; i++) {
                        add_v3_v3(fp, co);
                        fp+= 3; co+= 3;
                    }

                    fp+= 3; /* skip alphas */

                    bezt++;
                }
            }
            else {
                bp= nu->bp;
                a= nu->pntsu*nu->pntsv;

                while (a--) {
                    add_v3_v3(fp, co);

                    fp+= 4;
                    co+= 3;

                    bp++;
                }
            }

            nu= nu->next;
        }
    }
}