action.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.
 *
 * Contributor(s): Full recode, Ton Roosendaal, Crete 2005
 *               Full recode, Joshua Leung, 2009
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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

#include "MEM_guardedalloc.h"

#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_constraint_types.h"
#include "DNA_scene_types.h"
#include "DNA_object_types.h"

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

#include "BKE_animsys.h"
#include "BKE_action.h"
#include "BKE_anim.h"
#include "BKE_constraint.h"
#include "BKE_global.h"
#include "BKE_fcurve.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_object.h"

#include "BKE_idprop.h"

#include "BIK_api.h"

#include "RNA_access.h"

/* *********************** NOTE ON POSE AND ACTION **********************

  - Pose is the local (object level) component of armature. The current
    object pose is saved in files, and (will be) is presorted for dependency
  - Actions have fewer (or other) channels, and write data to a Pose
  - Currently ob->pose data is controlled in where_is_pose only. The (recalc)
    event system takes care of calling that
  - The NLA system (here too) uses Poses as interpolation format for Actions
  - Therefore we assume poses to be static, and duplicates of poses have channels in
    same order, for quick interpolation reasons

  ****************************** (ton) ************************************ */

/* ***************** Library data level operations on action ************** */

bAction *add_empty_action(const char name[])
{
    bAction *act;
    
    act= alloc_libblock(&G.main->action, ID_AC, name);
    
    return act;
}   

/* .................................. */

/* temp data for make_local_action */
typedef struct tMakeLocalActionContext {
    bAction *act;       /* original action */
    bAction *act_new;   /* new action */
    
    int is_lib;         /* some action users were libraries */
    int is_local;       /* some action users were not libraries */
} tMakeLocalActionContext;

/* helper function for make_local_action() - local/lib init step */
static void make_localact_init_cb(ID *id, AnimData *adt, void *mlac_ptr)
{
    tMakeLocalActionContext *mlac = (tMakeLocalActionContext *)mlac_ptr;
    
    if (adt->action == mlac->act) {
        if (id->lib) mlac->is_lib= TRUE;
        else mlac->is_local= TRUE;
    }
}

/* helper function for make_local_action() - change references */
static void make_localact_apply_cb(ID *id, AnimData *adt, void *mlac_ptr)
{
    tMakeLocalActionContext *mlac = (tMakeLocalActionContext *)mlac_ptr;
    
    if (adt->action == mlac->act) {
        if (id->lib == NULL) {
            adt->action = mlac->act_new;
            
            id_us_plus(&mlac->act_new->id);
            id_us_min(&mlac->act->id);
        }
    }
}

// does copy_fcurve...
void make_local_action(bAction *act)
{
    tMakeLocalActionContext mlac = {act, NULL, FALSE, FALSE};
    Main *bmain= G.main;
    
    if (act->id.lib==NULL) 
        return;
    
    // XXX: double-check this; it used to be just single-user check, but that was when fake-users were still default
    if ((act->id.flag & LIB_FAKEUSER) && (act->id.us<=1)) {
        id_clear_lib_data(bmain, &act->id);
        return;
    }
    
    BKE_animdata_main_cb(bmain, make_localact_init_cb, &mlac);
    
    if (mlac.is_local && mlac.is_lib==FALSE) {
        id_clear_lib_data(bmain, &act->id);
    }
    else if (mlac.is_local && mlac.is_lib) {
        mlac.act_new= copy_action(act);
        mlac.act_new->id.us= 0;

        BKE_id_lib_local_paths(bmain, act->id.lib, &mlac.act_new->id);

        BKE_animdata_main_cb(bmain, make_localact_apply_cb, &mlac);
    }
}

/* .................................. */

void free_action (bAction *act)
{
    /* sanity check */
    if (act == NULL)
        return;
    
    /* Free F-Curves */
    free_fcurves(&act->curves);
    
    /* Free groups */
    if (act->groups.first)
        BLI_freelistN(&act->groups);
        
    /* Free pose-references (aka local markers) */
    if (act->markers.first)
        BLI_freelistN(&act->markers);
}

/* .................................. */

bAction *copy_action (bAction *src)
{
    bAction *dst = NULL;
    bActionGroup *dgrp, *sgrp;
    FCurve *dfcu, *sfcu;
    
    if (src == NULL) 
        return NULL;
    dst= copy_libblock(&src->id);
    
    /* duplicate the lists of groups and markers */
    BLI_duplicatelist(&dst->groups, &src->groups);
    BLI_duplicatelist(&dst->markers, &src->markers);
    
    /* copy F-Curves, fixing up the links as we go */
    dst->curves.first= dst->curves.last= NULL;
    
    for (sfcu= src->curves.first; sfcu; sfcu= sfcu->next) {
        /* duplicate F-Curve */
        dfcu= copy_fcurve(sfcu);
        BLI_addtail(&dst->curves, dfcu);
        
        /* fix group links (kindof bad list-in-list search, but this is the most reliable way) */
        for (dgrp=dst->groups.first, sgrp=src->groups.first; dgrp && sgrp; dgrp=dgrp->next, sgrp=sgrp->next) {
            if (sfcu->grp == sgrp) {
                dfcu->grp= dgrp;
                
                if (dgrp->channels.first == sfcu)
                    dgrp->channels.first= dfcu;
                if (dgrp->channels.last == sfcu)
                    dgrp->channels.last= dfcu;
                    
                break;
            }
        }
    }
    
    return dst;
}

/* *************** Action Groups *************** */

/* Get the active action-group for an Action */
bActionGroup *get_active_actiongroup (bAction *act)
{
    bActionGroup *agrp= NULL;
    
    if (act && act->groups.first) { 
        for (agrp= act->groups.first; agrp; agrp= agrp->next) {
            if (agrp->flag & AGRP_ACTIVE)
                break;
        }
    }
    
    return agrp;
}

/* Make the given Action-Group the active one */
void set_active_action_group (bAction *act, bActionGroup *agrp, short select)
{
    bActionGroup *grp;
    
    /* sanity checks */
    if (act == NULL)
        return;
    
    /* Deactive all others */
    for (grp= act->groups.first; grp; grp= grp->next) {
        if ((grp==agrp) && (select))
            grp->flag |= AGRP_ACTIVE;
        else    
            grp->flag &= ~AGRP_ACTIVE;
    }
}

/* Add a new action group with the given name to the action */
bActionGroup *action_groups_add_new (bAction *act, const char name[])
{
    bActionGroup *agrp;
    
    /* sanity check: must have action and name */
    if (ELEM(NULL, act, name))
        return NULL;
    
    /* allocate a new one */
    agrp = MEM_callocN(sizeof(bActionGroup), "bActionGroup");
    
    /* make it selected, with default name */
    agrp->flag = AGRP_SELECTED;
    BLI_strncpy(agrp->name, name[0] ? name : "Group", sizeof(agrp->name));
    
    /* add to action, and validate */
    BLI_addtail(&act->groups, agrp);
    BLI_uniquename(&act->groups, agrp, "Group", '.', offsetof(bActionGroup, name), sizeof(agrp->name)); 
    
    /* return the new group */
    return agrp;
}

/* Add given channel into (active) group 
 *  - assumes that channel is not linked to anything anymore
 *  - always adds at the end of the group 
 */
void action_groups_add_channel (bAction *act, bActionGroup *agrp, FCurve *fcurve)
{   
    /* sanity checks */
    if (ELEM3(NULL, act, agrp, fcurve))
        return;
    
    /* if no channels anywhere, just add to two lists at the same time */
    if (act->curves.first == NULL) {
        fcurve->next = fcurve->prev = NULL;
        
        agrp->channels.first = agrp->channels.last = fcurve;
        act->curves.first = act->curves.last = fcurve;
    }
    
    /* if the group already has channels, the F-Curve can simply be added to the list 
     * (i.e. as the last channel in the group)
     */
    else if (agrp->channels.first) {
        /* if the group's last F-Curve is the action's last F-Curve too, 
         * then set the F-Curve as the last for the action first so that
         * the lists will be in sync after linking
         */
        if (agrp->channels.last == act->curves.last)
            act->curves.last= fcurve;
            
        /* link in the given F-Curve after the last F-Curve in the group,
         * which means that it should be able to fit in with the rest of the
         * list seamlessly
         */
        BLI_insertlinkafter(&agrp->channels, agrp->channels.last, fcurve);
    }
    
    /* otherwise, need to find the nearest F-Curve in group before/after current to link with */
    else {
        bActionGroup *grp;
        
        /* firstly, link this F-Curve to the group */
        agrp->channels.first = agrp->channels.last = fcurve;
        
        /* step through the groups preceding this one, finding the F-Curve there to attach this one after */
        for (grp= agrp->prev; grp; grp= grp->prev) {
            /* if this group has F-Curves, we want weave the given one in right after the last channel there,
             * but via the Action's list not this group's list
             *  - this is so that the F-Curve is in the right place in the Action,
             *    but won't be included in the previous group
             */
            if (grp->channels.last) {
                /* once we've added, break here since we don't need to search any further... */
                BLI_insertlinkafter(&act->curves, grp->channels.last, fcurve);
                break;
            }
        }
        
        /* if grp is NULL, that means we fell through, and this F-Curve should be added as the new first
         * since group is (effectively) the first group. Thus, the existing first F-Curve becomes the 
         * second in the chain, etc. etc.
         */
        if (grp == NULL)
            BLI_insertlinkbefore(&act->curves, act->curves.first, fcurve);
    }
    
    /* set the F-Curve's new group */
    fcurve->grp= agrp;
}   

/* Remove the given channel from all groups */
void action_groups_remove_channel (bAction *act, FCurve *fcu)
{
    /* sanity checks */
    if (ELEM(NULL, act, fcu))   
        return;
    
    /* check if any group used this directly */
    if (fcu->grp) {
        bActionGroup *agrp= fcu->grp;
        
        if (agrp->channels.first == agrp->channels.last) {
            if (agrp->channels.first == fcu) {
                agrp->channels.first= NULL;
                agrp->channels.last= NULL;
            }
        }
        else if (agrp->channels.first == fcu) {
            if ((fcu->next) && (fcu->next->grp==agrp))
                agrp->channels.first= fcu->next;
            else
                agrp->channels.first= NULL;
        }
        else if (agrp->channels.last == fcu) {
            if ((fcu->prev) && (fcu->prev->grp==agrp))
                agrp->channels.last= fcu->prev;
            else
                agrp->channels.last= NULL;
        }
        
        fcu->grp= NULL;
    }
    
    /* now just remove from list */
    BLI_remlink(&act->curves, fcu);
}

/* Find a group with the given name */
bActionGroup *action_groups_find_named (bAction *act, const char name[])
{
    /* sanity checks */
    if (ELEM3(NULL, act, act->groups.first, name) || (name[0] == 0))
        return NULL;
        
    /* do string comparisons */
    return BLI_findstring(&act->groups, name, offsetof(bActionGroup, name));
}

/* Clear all 'temp' flags on all groups */
void action_groups_clear_tempflags (bAction *act)
{
    bActionGroup *agrp;
    
    /* sanity checks */
    if (ELEM(NULL, act, act->groups.first))
        return;
        
    /* flag clearing loop */
    for (agrp = act->groups.first; agrp; agrp = agrp->next)
        agrp->flag &= ~AGRP_TEMP;
}

/* *************** Pose channels *************** */

/* usually used within a loop, so we got a N^2 slowdown */
bPoseChannel *get_pose_channel(const bPose *pose, const char *name)
{
    if (ELEM(NULL, pose, name) || (name[0] == 0))
        return NULL;
    
    if(pose->chanhash)
        return BLI_ghash_lookup(pose->chanhash, (void *)name);
    
    return BLI_findstring(&((bPose *)pose)->chanbase, name, offsetof(bPoseChannel, name));
}

/* Use with care, not on Armature poses but for temporal ones */
/* (currently used for action constraints and in rebuild_pose) */
bPoseChannel *verify_pose_channel(bPose *pose, const char *name)
{
    bPoseChannel *chan;
    
    if (pose == NULL)
        return NULL;
    
    /* See if this channel exists */
    chan= BLI_findstring(&pose->chanbase, name, offsetof(bPoseChannel, name));
    if(chan) {
        return chan;
    }

    /* If not, create it and add it */
    chan = MEM_callocN(sizeof(bPoseChannel), "verifyPoseChannel");
    
    BLI_strncpy(chan->name, name, sizeof(chan->name));
    /* init vars to prevent math errors */
    unit_qt(chan->quat);
    unit_axis_angle(chan->rotAxis, &chan->rotAngle);
    chan->size[0] = chan->size[1] = chan->size[2] = 1.0f;
    
    chan->limitmin[0]= chan->limitmin[1]= chan->limitmin[2]= -180.0f;
    chan->limitmax[0]= chan->limitmax[1]= chan->limitmax[2]= 180.0f;
    chan->stiffness[0]= chan->stiffness[1]= chan->stiffness[2]= 0.0f;
    chan->ikrotweight = chan->iklinweight = 0.0f;
    unit_m4(chan->constinv);
    
    chan->protectflag = OB_LOCK_ROT4D;  /* lock by components by default */
    
    BLI_addtail(&pose->chanbase, chan);
    free_pose_channels_hash(pose);
    
    return chan;
}

/* Find the active posechannel for an object (we can't just use pose, as layer info is in armature) */
bPoseChannel *get_active_posechannel (Object *ob)
{
    bArmature *arm= (ob) ? ob->data : NULL;
    bPoseChannel *pchan;
    
    if ELEM3(NULL, ob, ob->pose, arm)
        return NULL;
    
    /* find active */
    for (pchan= ob->pose->chanbase.first; pchan; pchan= pchan->next) {
        if ((pchan->bone) && (pchan->bone == arm->act_bone) && (pchan->bone->layer & arm->layer))
            return pchan;
    }
    
    return NULL;
}

const char *get_ikparam_name(bPose *pose)
{
    if (pose) {
        switch (pose->iksolver) {
        case IKSOLVER_LEGACY:
            return NULL;
        case IKSOLVER_ITASC:
            return "bItasc";
        }
    }
    return NULL;
}
/* dst should be freed already, makes entire duplicate */
void copy_pose (bPose **dst, bPose *src, int copycon)
{
    bPose *outPose;
    bPoseChannel *pchan;
    ListBase listb;
    
    if (!src) {
        *dst=NULL;
        return;
    }
    
    if (*dst==src) {
        printf("copy_pose source and target are the same\n");
        *dst=NULL;
        return;
    }
    
    outPose= MEM_callocN(sizeof(bPose), "pose");
    
    BLI_duplicatelist(&outPose->chanbase, &src->chanbase);
    
    outPose->iksolver = src->iksolver;
    outPose->ikdata = NULL;
    outPose->ikparam = MEM_dupallocN(src->ikparam);
    
    for (pchan=outPose->chanbase.first; pchan; pchan=pchan->next) {
        // TODO: rename this argument...
        if (copycon) {
            copy_constraints(&listb, &pchan->constraints, TRUE);  // copy_constraints NULLs listb
            pchan->constraints= listb;
            pchan->mpath= NULL; /* motion paths should not get copied yet... */
        }
        
        if(pchan->prop) {
            pchan->prop= IDP_CopyProperty(pchan->prop);
        }
    }

    /* for now, duplicate Bone Groups too when doing this */
    if (copycon)
        BLI_duplicatelist(&outPose->agroups, &src->agroups);
    
    *dst=outPose;
}

void init_pose_itasc(bItasc *itasc)
{
    if (itasc) {
        itasc->iksolver = IKSOLVER_ITASC;
        itasc->minstep = 0.01f;
        itasc->maxstep = 0.06f;
        itasc->numiter = 100;
        itasc->numstep = 4;
        itasc->precision = 0.005f;
        itasc->flag = ITASC_AUTO_STEP|ITASC_INITIAL_REITERATION;
        itasc->feedback = 20.f;
        itasc->maxvel = 50.f;
        itasc->solver = ITASC_SOLVER_SDLS;
        itasc->dampmax = 0.5;
        itasc->dampeps = 0.15;
    }
}
void init_pose_ikparam(bPose *pose)
{
    bItasc *itasc;
    switch (pose->iksolver) {
    case IKSOLVER_ITASC:
        itasc = MEM_callocN(sizeof(bItasc), "itasc");
        init_pose_itasc(itasc);
        pose->ikparam = itasc;
        break;
    case IKSOLVER_LEGACY:
    default:
        pose->ikparam = NULL;
        break;
    }
}

void make_pose_channels_hash(bPose *pose) 
{
    if(!pose->chanhash) {
        bPoseChannel *pchan;

        pose->chanhash= BLI_ghash_new(BLI_ghashutil_strhash, BLI_ghashutil_strcmp, "make_pose_chan gh");
        for(pchan=pose->chanbase.first; pchan; pchan=pchan->next)
            BLI_ghash_insert(pose->chanhash, pchan->name, pchan);
    }
}

void free_pose_channels_hash(bPose *pose) 
{
    if(pose->chanhash) {
        BLI_ghash_free(pose->chanhash, NULL, NULL);
        pose->chanhash= NULL;
    }
}


void free_pose_channel(bPoseChannel *pchan)
{

    if (pchan->mpath) {
        animviz_free_motionpath(pchan->mpath);
        pchan->mpath= NULL;
    }

    free_constraints(&pchan->constraints);
    
    if (pchan->prop) {
        IDP_FreeProperty(pchan->prop);
        MEM_freeN(pchan->prop);
    }
}

void free_pose_channels(bPose *pose) 
{
    bPoseChannel *pchan;
    
    if (pose->chanbase.first) {
        for (pchan = pose->chanbase.first; pchan; pchan=pchan->next)
            free_pose_channel(pchan);
        
        BLI_freelistN(&pose->chanbase);
    }

    free_pose_channels_hash(pose);
}

void free_pose(bPose *pose)
{
    if (pose) {
        /* free pose-channels */
        free_pose_channels(pose);
        
        /* free pose-groups */
        if (pose->agroups.first)
            BLI_freelistN(&pose->agroups);
        
        /* free IK solver state */
        BIK_clear_data(pose);
        
        /* free IK solver param */
        if (pose->ikparam)
            MEM_freeN(pose->ikparam);
        
        /* free pose */
        MEM_freeN(pose);
    }
}

static void copy_pose_channel_data(bPoseChannel *pchan, const bPoseChannel *chan)
{
    bConstraint *pcon, *con;
    
    copy_v3_v3(pchan->loc, chan->loc);
    copy_v3_v3(pchan->size, chan->size);
    copy_v3_v3(pchan->eul, chan->eul);
    copy_v3_v3(pchan->rotAxis, chan->rotAxis);
    pchan->rotAngle= chan->rotAngle;
    copy_qt_qt(pchan->quat, chan->quat);
    pchan->rotmode= chan->rotmode;
    copy_m4_m4(pchan->chan_mat, (float(*)[4])chan->chan_mat);
    copy_m4_m4(pchan->pose_mat, (float(*)[4])chan->pose_mat);
    pchan->flag= chan->flag;
    
    con= chan->constraints.first;
    for(pcon= pchan->constraints.first; pcon && con; pcon= pcon->next, con= con->next) {
        pcon->enforce= con->enforce;
        pcon->headtail= con->headtail;
    }
}

/* makes copies of internal data, unlike copy_pose_channel_data which only
 * copies the pose state.
 * hint: use when copying bones in editmode (on returned value from verify_pose_channel) */
void duplicate_pose_channel_data(bPoseChannel *pchan, const bPoseChannel *pchan_from)
{
    /* copy transform locks */
    pchan->protectflag = pchan_from->protectflag;

    /* copy rotation mode */
    pchan->rotmode = pchan_from->rotmode;

    /* copy bone group */
    pchan->agrp_index= pchan_from->agrp_index;

    /* ik (dof) settings */
    pchan->ikflag = pchan_from->ikflag;
    copy_v3_v3(pchan->limitmin, pchan_from->limitmin);
    copy_v3_v3(pchan->limitmax, pchan_from->limitmax);
    copy_v3_v3(pchan->stiffness, pchan_from->stiffness);
    pchan->ikstretch= pchan_from->ikstretch;
    pchan->ikrotweight= pchan_from->ikrotweight;
    pchan->iklinweight= pchan_from->iklinweight;

    /* constraints */
    copy_constraints(&pchan->constraints, &pchan_from->constraints, TRUE);

    /* id-properties */
    if(pchan->prop) {
        /* unlikely but possible it exists */
        IDP_FreeProperty(pchan->prop);
        MEM_freeN(pchan->prop);
        pchan->prop= NULL;
    }
    if(pchan_from->prop) {
        pchan->prop= IDP_CopyProperty(pchan_from->prop);
    }

    /* custom shape */
    pchan->custom= pchan_from->custom;
}


/* checks for IK constraint, Spline IK, and also for Follow-Path constraint.
 * can do more constraints flags later 
 */
/* pose should be entirely OK */
void update_pose_constraint_flags(bPose *pose)
{
    bPoseChannel *pchan, *parchan;
    bConstraint *con;
    
    /* clear */
    for (pchan= pose->chanbase.first; pchan; pchan= pchan->next) {
        pchan->constflag= 0;
    }
    pose->flag &= ~POSE_CONSTRAINTS_TIMEDEPEND;
    
    /* detect */
    for (pchan= pose->chanbase.first; pchan; pchan=pchan->next) {
        for (con= pchan->constraints.first; con; con= con->next) {
            if (con->type==CONSTRAINT_TYPE_KINEMATIC) {
                bKinematicConstraint *data = (bKinematicConstraint*)con->data;
                
                pchan->constflag |= PCHAN_HAS_IK;
                
                if(data->tar==NULL || (data->tar->type==OB_ARMATURE && data->subtarget[0]==0))
                    pchan->constflag |= PCHAN_HAS_TARGET;
                
                /* negative rootbone = recalc rootbone index. used in do_versions */
                if(data->rootbone<0) {
                    data->rootbone= 0;
                    
                    if(data->flag & CONSTRAINT_IK_TIP) parchan= pchan;
                    else parchan= pchan->parent;
                    
                    while(parchan) {
                        data->rootbone++;
                        if((parchan->bone->flag & BONE_CONNECTED)==0)
                            break;
                        parchan= parchan->parent;
                    }
                }
            }
            else if (con->type == CONSTRAINT_TYPE_FOLLOWPATH) {
                bFollowPathConstraint *data= (bFollowPathConstraint *)con->data;
                
                /* for drawing constraint colors when color set allows this */
                pchan->constflag |= PCHAN_HAS_CONST;
                
                /* if we have a valid target, make sure that this will get updated on frame-change
                 * (needed for when there is no anim-data for this pose)
                 */
                if ((data->tar) && (data->tar->type==OB_CURVE))
                    pose->flag |= POSE_CONSTRAINTS_TIMEDEPEND;
            }
            else if (con->type == CONSTRAINT_TYPE_SPLINEIK)
                pchan->constflag |= PCHAN_HAS_SPLINEIK;
            else 
                pchan->constflag |= PCHAN_HAS_CONST;
        }
    }
}

/* Clears all BONE_UNKEYED flags for every pose channel in every pose 
 * This should only be called on frame changing, when it is acceptable to
 * do this. Otherwise, these flags should not get cleared as poses may get lost.
 */
void framechange_poses_clear_unkeyed(void)
{
    Object *ob;
    bPose *pose;
    bPoseChannel *pchan;
    
    /* This needs to be done for each object that has a pose */
    // TODO: proxies may/may not be correctly handled here... (this needs checking) 
    for (ob= G.main->object.first; ob; ob= ob->id.next) {
        /* we only need to do this on objects with a pose */
        if ( (pose= ob->pose) ) {
            for (pchan= pose->chanbase.first; pchan; pchan= pchan->next) {
                if (pchan->bone) 
                    pchan->bone->flag &= ~BONE_UNKEYED;
            }
        }
    }
}

/* ************************** Bone Groups ************************** */

/* Adds a new bone-group */
void pose_add_group (Object *ob)
{
    bPose *pose= (ob) ? ob->pose : NULL;
    bActionGroup *grp;
    
    if (ELEM(NULL, ob, ob->pose))
        return;
    
    grp= MEM_callocN(sizeof(bActionGroup), "PoseGroup");
    BLI_strncpy(grp->name, "Group", sizeof(grp->name));
    BLI_addtail(&pose->agroups, grp);
    BLI_uniquename(&pose->agroups, grp, "Group", '.', offsetof(bActionGroup, name), sizeof(grp->name));
    
    pose->active_group= BLI_countlist(&pose->agroups);
}

/* Remove the active bone-group */
void pose_remove_group (Object *ob)
{
    bPose *pose= (ob) ? ob->pose : NULL;
    bActionGroup *grp = NULL;
    bPoseChannel *pchan;
    
    /* sanity checks */
    if (ELEM(NULL, ob, pose))
        return;
    if (pose->active_group <= 0)
        return;
    
    /* get group to remove */
    grp= BLI_findlink(&pose->agroups, pose->active_group-1);
    if (grp) {
        /* adjust group references (the trouble of using indices!):
         *  - firstly, make sure nothing references it 
         *  - also, make sure that those after this item get corrected
         */
        for (pchan= pose->chanbase.first; pchan; pchan= pchan->next) {
            if (pchan->agrp_index == pose->active_group)
                pchan->agrp_index= 0;
            else if (pchan->agrp_index > pose->active_group)
                pchan->agrp_index--;
        }
        
        /* now, remove it from the pose */
        BLI_freelinkN(&pose->agroups, grp);
        pose->active_group--;
        if(pose->active_group < 0 || pose->agroups.first == NULL) {
            pose->active_group= 0;
        }
    }
}

/* ************** F-Curve Utilities for Actions ****************** */

/* Check if the given action has any keyframes */
short action_has_motion(const bAction *act)
{
    FCurve *fcu;
    
    /* return on the first F-Curve that has some keyframes/samples defined */
    if (act) {
        for (fcu= act->curves.first; fcu; fcu= fcu->next) {
            if (fcu->totvert)
                return 1;
        }
    }
    
    /* nothing found */
    return 0;
}

/* Calculate the extents of given action */
void calc_action_range(const bAction *act, float *start, float *end, short incl_modifiers)
{
    FCurve *fcu;
    float min=999999999.0f, max=-999999999.0f;
    short foundvert=0, foundmod=0;

    if (act) {
        for (fcu= act->curves.first; fcu; fcu= fcu->next) {
            /* if curve has keyframes, consider them first */
            if (fcu->totvert) {
                float nmin, nmax;
                
                /* get extents for this curve */
                // TODO: allow enabling/disabling this?
                calc_fcurve_range(fcu, &nmin, &nmax, FALSE, TRUE);
                
                /* compare to the running tally */
                min= MIN2(min, nmin);
                max= MAX2(max, nmax);
                
                foundvert= 1;
            }
            
            /* if incl_modifiers is enabled, need to consider modifiers too
             *  - only really care about the last modifier
             */
            if ((incl_modifiers) && (fcu->modifiers.last)) {
                FModifier *fcm= fcu->modifiers.last;
                
                /* only use the maximum sensible limits of the modifiers if they are more extreme */
                switch (fcm->type) {
                    case FMODIFIER_TYPE_LIMITS: /* Limits F-Modifier */
                    {
                        FMod_Limits *fmd= (FMod_Limits *)fcm->data;
                        
                        if (fmd->flag & FCM_LIMIT_XMIN) {
                            min= MIN2(min, fmd->rect.xmin);
                        }
                        if (fmd->flag & FCM_LIMIT_XMAX) {
                            max= MAX2(max, fmd->rect.xmax);
                        }
                    }
                        break;
                        
                    case FMODIFIER_TYPE_CYCLES: /* Cycles F-Modifier */
                    {
                        FMod_Cycles *fmd= (FMod_Cycles *)fcm->data;
                        
                        if (fmd->before_mode != FCM_EXTRAPOLATE_NONE)
                            min= MINAFRAMEF;
                        if (fmd->after_mode != FCM_EXTRAPOLATE_NONE)
                            max= MAXFRAMEF;
                    }
                        break;
                        
                    // TODO: function modifier may need some special limits
                        
                    default: /* all other standard modifiers are on the infinite range... */
                        min= MINAFRAMEF;
                        max= MAXFRAMEF;
                        break;
                }
                
                foundmod= 1;
            }
        }
    }   
    
    if (foundvert || foundmod) {
        if(min==max) max+= 1.0f;
        *start= min;
        *end= max;
    }
    else {
        *start= 0.0f;
        *end= 1.0f;
    }
}

/* Return flags indicating which transforms the given object/posechannel has 
 *  - if 'curves' is provided, a list of links to these curves are also returned
 */
short action_get_item_transforms (bAction *act, Object *ob, bPoseChannel *pchan, ListBase *curves)
{
    PointerRNA ptr;
    FCurve *fcu;
    char *basePath=NULL;
    short flags=0;
    
    /* build PointerRNA from provided data to obtain the paths to use */
    if (pchan)
        RNA_pointer_create((ID *)ob, &RNA_PoseBone, pchan, &ptr);
    else if (ob)
        RNA_id_pointer_create((ID *)ob, &ptr);
    else    
        return 0;
        
    /* get the basic path to the properties of interest */
    basePath= RNA_path_from_ID_to_struct(&ptr);
    if (basePath == NULL)
        return 0;
        
    /* search F-Curves for the given properties 
     *  - we cannot use the groups, since they may not be grouped in that way...
     */
    for (fcu= act->curves.first; fcu; fcu= fcu->next) {
        char *bPtr=NULL, *pPtr=NULL;
        
        /* if enough flags have been found, we can stop checking unless we're also getting the curves */
        if ((flags == ACT_TRANS_ALL) && (curves == NULL))
            break;
            
        /* just in case... */
        if (fcu->rna_path == NULL)
            continue;
        
        /* step 1: check for matching base path */
        bPtr= strstr(fcu->rna_path, basePath);
        
        if (bPtr) {
            /* we must add len(basePath) bytes to the match so that we are at the end of the 
             * base path so that we don't get false positives with these strings in the names
             */
            bPtr += strlen(basePath);
            
            /* step 2: check for some property with transforms 
             *  - to speed things up, only check for the ones not yet found 
             *    unless we're getting the curves too
             *  - if we're getting the curves, the BLI_genericNodeN() creates a LinkData
             *    node wrapping the F-Curve, which then gets added to the list
             *  - once a match has been found, the curve cannot possibly be any other one
             */
            if ((curves) || (flags & ACT_TRANS_LOC) == 0) {
                pPtr= strstr(bPtr, "location");
                if (pPtr) {
                    flags |= ACT_TRANS_LOC;
                    
                    if (curves) 
                        BLI_addtail(curves, BLI_genericNodeN(fcu));
                    continue;
                }
            }
            
            if ((curves) || (flags & ACT_TRANS_SCALE) == 0) {
                pPtr= strstr(bPtr, "scale");
                if (pPtr) {
                    flags |= ACT_TRANS_SCALE;
                    
                    if (curves) 
                        BLI_addtail(curves, BLI_genericNodeN(fcu));
                    continue;
                }
            }
            
            if ((curves) || (flags & ACT_TRANS_ROT) == 0) {
                pPtr= strstr(bPtr, "rotation");
                if (pPtr) {
                    flags |= ACT_TRANS_ROT;
                    
                    if (curves) 
                        BLI_addtail(curves, BLI_genericNodeN(fcu));
                    continue;
                }
            }
            
            if ((curves) || (flags & ACT_TRANS_PROP) == 0) {
                /* custom properties only */
                pPtr= strstr(bPtr, "[\""); /* extra '"' comment here to keep my texteditor functionlist working :) */  
                if (pPtr) {
                    flags |= ACT_TRANS_PROP;
                    
                    if (curves)
                        BLI_addtail(curves, BLI_genericNodeN(fcu));
                    continue;
                }
            }
        }
    }
    
    /* free basePath */
    MEM_freeN(basePath);
    
    /* return flags found */
    return flags;
}

/* ************** Pose Management Tools ****************** */

/* Copy the data from the action-pose (src) into the pose */
/* both args are assumed to be valid */
/* exported to game engine */
/* Note! this assumes both poses are aligned, this isnt always true when dealing with user poses */
void extract_pose_from_pose(bPose *pose, const bPose *src)
{
    const bPoseChannel *schan;
    bPoseChannel *pchan= pose->chanbase.first;

    if (pose==src) {
        printf("extract_pose_from_pose source and target are the same\n");
        return;
    }

    for (schan=src->chanbase.first; (schan && pchan); schan=schan->next, pchan= pchan->next) {
        copy_pose_channel_data(pchan, schan);
    }
}

/* for do_all_pose_actions, clears the pose. Now also exported for proxy and tools */
void rest_pose(bPose *pose)
{
    bPoseChannel *pchan;
    
    if (!pose)
        return;
    
    memset(pose->stride_offset, 0, sizeof(pose->stride_offset));
    memset(pose->cyclic_offset, 0, sizeof(pose->cyclic_offset));
    
    for (pchan=pose->chanbase.first; pchan; pchan= pchan->next) {
        zero_v3(pchan->loc);
        zero_v3(pchan->eul);
        unit_qt(pchan->quat);
        unit_axis_angle(pchan->rotAxis, &pchan->rotAngle);
        pchan->size[0]= pchan->size[1]= pchan->size[2]= 1.0f;

        pchan->flag &= ~(POSE_LOC|POSE_ROT|POSE_SIZE);
    }
}

/* both poses should be in sync */
void copy_pose_result(bPose *to, bPose *from)
{
    bPoseChannel *pchanto, *pchanfrom;
    
    if(to==NULL || from==NULL) {
        printf("pose result copy error to:%p from:%p\n", (void *)to, (void *)from); // debug temp
        return;
    }

    if (to==from) {
        printf("copy_pose_result source and target are the same\n");
        return;
    }


    for(pchanfrom= from->chanbase.first; pchanfrom; pchanfrom= pchanfrom->next) {
        pchanto= get_pose_channel(to, pchanfrom->name);
        if(pchanto) {
            copy_m4_m4(pchanto->pose_mat, pchanfrom->pose_mat);
            copy_m4_m4(pchanto->chan_mat, pchanfrom->chan_mat);
            
            /* used for local constraints */
            copy_v3_v3(pchanto->loc, pchanfrom->loc);
            copy_qt_qt(pchanto->quat, pchanfrom->quat);
            copy_v3_v3(pchanto->eul, pchanfrom->eul);
            copy_v3_v3(pchanto->size, pchanfrom->size);
            
            copy_v3_v3(pchanto->pose_head, pchanfrom->pose_head);
            copy_v3_v3(pchanto->pose_tail, pchanfrom->pose_tail);
            
            pchanto->rotmode= pchanfrom->rotmode;
            pchanto->flag= pchanfrom->flag;
            pchanto->protectflag= pchanfrom->protectflag;
        }
    }
}

/* For the calculation of the effects of an Action at the given frame on an object 
 * This is currently only used for the Action Constraint 
 */
void what_does_obaction (Object *ob, Object *workob, bPose *pose, bAction *act, char groupname[], float cframe)
{
    bActionGroup *agrp= action_groups_find_named(act, groupname);
    
    /* clear workob */
    clear_workob(workob);
    
    /* init workob */
    copy_m4_m4(workob->obmat, ob->obmat);
    copy_m4_m4(workob->parentinv, ob->parentinv);
    copy_m4_m4(workob->constinv, ob->constinv);
    workob->parent= ob->parent;
    
    workob->rotmode= ob->rotmode;
    
    workob->trackflag= ob->trackflag;
    workob->upflag= ob->upflag;
    
    workob->partype= ob->partype;
    workob->par1= ob->par1;
    workob->par2= ob->par2;
    workob->par3= ob->par3;

    workob->constraints.first = ob->constraints.first;
    workob->constraints.last = ob->constraints.last;
    
    workob->pose= pose; /* need to set pose too, since this is used for both types of Action Constraint */

    BLI_strncpy(workob->parsubstr, ob->parsubstr, sizeof(workob->parsubstr));
    BLI_strncpy(workob->id.name, "OB<ConstrWorkOb>", sizeof(workob->id.name)); /* we don't use real object name, otherwise RNA screws with the real thing */
    
    /* if we're given a group to use, it's likely to be more efficient (though a bit more dangerous) */
    if (agrp) {
        /* specifically evaluate this group only */
        PointerRNA id_ptr;
        
        /* get RNA-pointer for the workob's ID */
        RNA_id_pointer_create(&workob->id, &id_ptr);
        
        /* execute action for this group only */
        animsys_evaluate_action_group(&id_ptr, act, agrp, NULL, cframe);
    }
    else {
        AnimData adt= {NULL};
        
        /* init animdata, and attach to workob */
        workob->adt= &adt;
        
        adt.recalc= ADT_RECALC_ANIM;
        adt.action= act;
        
        /* execute effects of Action on to workob (or it's PoseChannels) */
        BKE_animsys_evaluate_animdata(NULL, &workob->id, &adt, cframe, ADT_RECALC_ANIM);
    }
}

/* ********** NLA with non-poses works with ipo channels ********** */

#if 0 // XXX OLD ANIMATION SYSTEM (TO BE REMOVED)

/* ************************ Blending with NLA *************** */

static void blend_pose_strides(bPose *dst, bPose *src, float srcweight, short mode)
{
    float dstweight;
    
    switch (mode){
        case ACTSTRIPMODE_BLEND:
            dstweight = 1.0F - srcweight;
            break;
        case ACTSTRIPMODE_ADD:
            dstweight = 1.0F;
            break;
        default :
            dstweight = 1.0F;
    }
    
    interp_v3_v3v3(dst->stride_offset, dst->stride_offset, src->stride_offset, srcweight);
}


/* 

bone matching diagram, strips A and B

                 .------------------------.
                 |         A              |
                 '------------------------'
                 .          .             b2
                 .          .-------------v----------.
                 .          |         B   .          |
                 .          '------------------------'
                 .          .             .
                 .          .             .
offset:          .    0     .    A-B      .  A-b2+B     
                 .          .             .

*/


static void blend_pose_offset_bone(bActionStrip *strip, bPose *dst, bPose *src, float srcweight, short mode)
{
    /* matching offset bones */
    /* take dst offset, and put src on on that location */
    
    if(strip->offs_bone[0]==0)
        return;
    
    /* are we also blending with matching bones? */
    if(strip->prev && strip->start>=strip->prev->start) {
        bPoseChannel *dpchan= get_pose_channel(dst, strip->offs_bone);
        if(dpchan) {
            bPoseChannel *spchan= get_pose_channel(src, strip->offs_bone);
            if(spchan) {
                float vec[3];
                
                /* dst->ctime has the internal strip->prev action time */
                /* map this time to nla time */
                
                float ctime= get_actionstrip_frame(strip, src->ctime, 1);
                
                if( ctime > strip->prev->end) {
                    bActionChannel *achan;
                    
                    /* add src to dest, minus the position of src on strip->prev->end */
                    
                    ctime= get_actionstrip_frame(strip, strip->prev->end, 0);
                    
                    achan= get_action_channel(strip->act, strip->offs_bone);
                    if(achan && achan->ipo) {
                        bPoseChannel pchan;
                        /* Evaluates and sets the internal ipo value */
                        calc_ipo(achan->ipo, ctime);
                        /* This call also sets the pchan flags */
                        execute_action_ipo(achan, &pchan);
                        
                        /* store offset that moves src to location of pchan */
                        sub_v3_v3v3(vec, dpchan->loc, pchan.loc);
                        
                        mul_mat3_m4_v3(dpchan->bone->arm_mat, vec);
                    }
                }
                else {
                    /* store offset that moves src to location of dst */
                    
                    sub_v3_v3v3(vec, dpchan->loc, spchan->loc);
                    mul_mat3_m4_v3(dpchan->bone->arm_mat, vec);
                }
                
                /* if blending, we only add with factor scrweight */
                mul_v3_fl(vec, srcweight);
                
                add_v3_v3(dst->cyclic_offset, vec);
            }
        }
    }
    
    add_v3_v3(dst->cyclic_offset, src->cyclic_offset);
}

/* added "sizecorr" here, to allow armatures to be scaled and still have striding.
   Only works for uniform scaling. In general I'd advise against scaling armatures ever though! (ton)
*/
static float stridechannel_frame(Object *ob, float sizecorr, bActionStrip *strip, Path *path, float pathdist, float *stride_offset)
{
    bAction *act= strip->act;
    const char *name= strip->stridechannel;
    bActionChannel *achan= get_action_channel(act, name);
    int stride_axis= strip->stride_axis;

    if(achan && achan->ipo) {
        IpoCurve *icu= NULL;
        float minx=0.0f, maxx=0.0f, miny=0.0f, maxy=0.0f;
        int foundvert= 0;
        
        if(stride_axis==0) stride_axis= AC_LOC_X;
        else if(stride_axis==1) stride_axis= AC_LOC_Y;
        else stride_axis= AC_LOC_Z;
        
        /* calculate the min/max */
        for (icu=achan->ipo->curve.first; icu; icu=icu->next) {
            if(icu->adrcode==stride_axis) {
                if(icu->totvert>1) {
                    foundvert= 1;
                    minx= icu->bezt[0].vec[1][0];
                    maxx= icu->bezt[icu->totvert-1].vec[1][0];
                    
                    miny= icu->bezt[0].vec[1][1];
                    maxy= icu->bezt[icu->totvert-1].vec[1][1];
                }
                break;
            }
        }
        
        if(foundvert && miny!=maxy) {
            float stridelen= sizecorr*fabs(maxy-miny), striptime;
            float actiondist, pdist, pdistNewNormalized, offs;
            float vec1[4], vec2[4], dir[3];
            
            /* internal cycling, actoffs is in frames */
            offs= stridelen*strip->actoffs/(maxx-minx);
            
            /* amount path moves object */
            pdist = (float)fmod (pathdist+offs, stridelen);
            striptime= pdist/stridelen;
            
            /* amount stride bone moves */
            actiondist= sizecorr*eval_icu(icu, minx + striptime*(maxx-minx)) - miny;
            
            pdist = fabs(actiondist) - pdist;
            pdistNewNormalized = (pathdist+pdist)/path->totdist;
            
            /* now we need to go pdist further (or less) on cu path */
            where_on_path(ob, (pathdist)/path->totdist, vec1, dir); /* vec needs size 4 */
            if (pdistNewNormalized <= 1) {
                // search for correction in positive path-direction
                where_on_path(ob, pdistNewNormalized, vec2, dir);   /* vec needs size 4 */
                sub_v3_v3v3(stride_offset, vec2, vec1);
            }
            else {
                // we reached the end of the path, search backwards instead
                where_on_path(ob, (pathdist-pdist)/path->totdist, vec2, dir);   /* vec needs size 4 */
                sub_v3_v3v3(stride_offset, vec1, vec2);
            }
            mul_mat3_m4_v3(ob->obmat, stride_offset);
            return striptime;
        }
    }
    return 0.0f;
}

static void cyclic_offs_bone(Object *ob, bPose *pose, bActionStrip *strip, float time)
{
    /* only called when strip has cyclic, so >= 1.0f works... */
    if(time >= 1.0f) {
        bActionChannel *achan= get_action_channel(strip->act, strip->offs_bone);

        if(achan && achan->ipo) {
            IpoCurve *icu= NULL;
            Bone *bone;
            float min[3]={0.0f, 0.0f, 0.0f}, max[3]={0.0f, 0.0f, 0.0f};
            int index=0, foundvert= 0;
            
            /* calculate the min/max */
            for (icu=achan->ipo->curve.first; icu; icu=icu->next) {
                if(icu->totvert>1) {
                    
                    if(icu->adrcode==AC_LOC_X)
                        index= 0;
                    else if(icu->adrcode==AC_LOC_Y)
                        index= 1;
                    else if(icu->adrcode==AC_LOC_Z)
                        index= 2;
                    else
                        continue;
                
                    foundvert= 1;
                    min[index]= icu->bezt[0].vec[1][1];
                    max[index]= icu->bezt[icu->totvert-1].vec[1][1];
                }
            }
            if(foundvert) {
                /* bring it into armature space */
                sub_v3_v3v3(min, max, min);
                bone= get_named_bone(ob->data, strip->offs_bone);   /* weak */
                if(bone) {
                    mul_mat3_m4_v3(bone->arm_mat, min);
                    
                    /* dominant motion, cyclic_offset was cleared in rest_pose */
                    if (strip->flag & (ACTSTRIP_CYCLIC_USEX | ACTSTRIP_CYCLIC_USEY | ACTSTRIP_CYCLIC_USEZ)) {
                        if (strip->flag & ACTSTRIP_CYCLIC_USEX) pose->cyclic_offset[0]= time*min[0];
                        if (strip->flag & ACTSTRIP_CYCLIC_USEY) pose->cyclic_offset[1]= time*min[1];
                        if (strip->flag & ACTSTRIP_CYCLIC_USEZ) pose->cyclic_offset[2]= time*min[2];
                    } else {
                        if( fabs(min[0]) >= fabs(min[1]) && fabs(min[0]) >= fabs(min[2]))
                            pose->cyclic_offset[0]= time*min[0];
                        else if( fabs(min[1]) >= fabs(min[0]) && fabs(min[1]) >= fabs(min[2]))
                            pose->cyclic_offset[1]= time*min[1];
                        else
                            pose->cyclic_offset[2]= time*min[2];
                    }
                }
            }
        }
    }
}

/* simple case for now; only the curve path with constraint value > 0.5 */
/* blending we might do later... */
static Object *get_parent_path(Object *ob)
{
    bConstraint *con;
    
    if(ob->parent && ob->parent->type==OB_CURVE)
        return ob->parent;
    
    for (con = ob->constraints.first; con; con=con->next) {
        if(con->type==CONSTRAINT_TYPE_FOLLOWPATH) {
            if(con->enforce>0.5f) {
                bFollowPathConstraint *data= con->data;
                return data->tar;
            }
        }
    }
    return NULL;
}

/* ************** do the action ************ */

/* ----- nla, etc. --------- */

static void do_nla(Scene *scene, Object *ob, int blocktype)
{
    bPose *tpose= NULL;
    Key *key= NULL;
    ListBase tchanbase={NULL, NULL}, chanbase={NULL, NULL};
    bActionStrip *strip, *striplast=NULL, *stripfirst=NULL;
    float striptime, frametime, length, actlength;
    float blendfac, stripframe;
    float scene_cfra= BKE_curframe(scene);
    int doit, dostride;
    
    if(blocktype==ID_AR) {
        copy_pose(&tpose, ob->pose, 1);
        rest_pose(ob->pose);        // potentially destroying current not-keyed pose
    }
    else {
        key= ob_get_key(ob);
    }
    
    /* check on extend to left or right, when no strip is hit by 'cfra' */
    for (strip=ob->nlastrips.first; strip; strip=strip->next) {
        /* escape loop on a hit */
        if( scene_cfra >= strip->start && scene_cfra <= strip->end + 0.1f)  /* note 0.1 comes back below */
            break;
        if(scene_cfra < strip->start) {
            if(stripfirst==NULL)
                stripfirst= strip;
            else if(stripfirst->start > strip->start)
                stripfirst= strip;
        }
        else if(scene_cfra > strip->end) {
            if(striplast==NULL)
                striplast= strip;
            else if(striplast->end < strip->end)
                striplast= strip;
        }
    }
    if(strip==NULL) {   /* extend */
        if(striplast)
            scene_cfra= striplast->end;
        else if(stripfirst)
            scene_cfra= stripfirst->start;
    }
    
    /* and now go over all strips */
    for (strip=ob->nlastrips.first; strip; strip=strip->next){
        doit=dostride= 0;
        
        if (strip->act && !(strip->flag & ACTSTRIP_MUTE)) { /* so theres an action */
            
            /* Determine if the current frame is within the strip's range */
            length = strip->end-strip->start;
            actlength = strip->actend-strip->actstart;
            striptime = (scene_cfra-(strip->start)) / length;
            stripframe = (scene_cfra-(strip->start)) ;

            if (striptime>=0.0){
                
                if(blocktype==ID_AR) 
                    rest_pose(tpose);
                
                /* To handle repeat, we add 0.1 frame extra to make sure the last frame is included */
                if (striptime < 1.0f + 0.1f/length) {
                    
                    /* Handle path */
                    if ((strip->flag & ACTSTRIP_USESTRIDE) && (blocktype==ID_AR) && (ob->ipoflag & OB_DISABLE_PATH)==0){
                        Object *parent= get_parent_path(ob);
                        
                        if (parent) {
                            Curve *cu = parent->data;
                            float ctime, pdist;
                            
                            if (cu->flag & CU_PATH){
                                /* Ensure we have a valid path */
                                if(cu->path==NULL || cu->path->data==NULL) makeDispListCurveTypes(scene, parent, 0);
                                if(cu->path) {
                                    
                                    /* Find the position on the path */
                                    ctime= bsystem_time(scene, ob, scene_cfra, 0.0);
                                    
                                    if(calc_ipo_spec(cu->ipo, CU_SPEED, &ctime)==0) {
                                        /* correct for actions not starting on zero */
                                        ctime= (ctime - strip->actstart)/cu->pathlen;
                                        CLAMP(ctime, 0.0, 1.0);
                                    }
                                    pdist = ctime*cu->path->totdist;
                                    
                                    if(tpose && strip->stridechannel[0]) {
                                        striptime= stridechannel_frame(parent, ob->size[0], strip, cu->path, pdist, tpose->stride_offset);
                                    }                                   
                                    else {
                                        if (strip->stridelen) {
                                            striptime = pdist / strip->stridelen;
                                            striptime = (float)fmod (striptime+strip->actoffs, 1.0);
                                        }
                                        else
                                            striptime = 0;
                                    }
                                    
                                    frametime = (striptime * actlength) + strip->actstart;
                                    frametime= bsystem_time(scene, ob, frametime, 0.0);
                                    
                                    if(blocktype==ID_AR) {
                                        extract_pose_from_action (tpose, strip->act, frametime);
                                    }
                                    else if(blocktype==ID_OB) {
                                        extract_ipochannels_from_action(&tchanbase, &ob->id, strip->act, "Object", frametime);
                                        if(key)
                                            extract_ipochannels_from_action(&tchanbase, &key->id, strip->act, "Shape", frametime);
                                    }
                                    doit=dostride= 1;
                                }
                            }
                        }
                    }
                    /* To handle repeat, we add 0.1 frame extra to make sure the last frame is included */
                    else  {
                        
                        /* Mod to repeat */
                        if(strip->repeat!=1.0f) {
                            float cycle= striptime*strip->repeat;
                            
                            striptime = (float)fmod (cycle, 1.0f + 0.1f/length);
                            cycle-= striptime;
                            
                            if(blocktype==ID_AR)
                                cyclic_offs_bone(ob, tpose, strip, cycle);
                        }

                        frametime = (striptime * actlength) + strip->actstart;
                        frametime= nla_time(scene, frametime, (float)strip->repeat);
                            
                        if(blocktype==ID_AR) {
                            extract_pose_from_action (tpose, strip->act, frametime);
                        }
                        else if(blocktype==ID_OB) {
                            extract_ipochannels_from_action(&tchanbase, &ob->id, strip->act, "Object", frametime);
                            if(key)
                                extract_ipochannels_from_action(&tchanbase, &key->id, strip->act, "Shape", frametime);
                        }
                        
                        doit=1;
                    }
                }
                /* Handle extend */
                else {
                    if (strip->flag & ACTSTRIP_HOLDLASTFRAME){
                        /* we want the strip to hold on the exact fraction of the repeat value */
                        
                        frametime = actlength * (strip->repeat-(int)strip->repeat);
                        if(frametime<=0.000001f) frametime= actlength;  /* rounding errors... */
                        frametime= bsystem_time(scene, ob, frametime+strip->actstart, 0.0);
                        
                        if(blocktype==ID_AR)
                            extract_pose_from_action (tpose, strip->act, frametime);
                        else if(blocktype==ID_OB) {
                            extract_ipochannels_from_action(&tchanbase, &ob->id, strip->act, "Object", frametime);
                            if(key)
                                extract_ipochannels_from_action(&tchanbase, &key->id, strip->act, "Shape", frametime);
                        }
                        
                        /* handle cycle hold */
                        if(strip->repeat!=1.0f) {
                            if(blocktype==ID_AR)
                                cyclic_offs_bone(ob, tpose, strip, strip->repeat-1.0f);
                        }
                        
                        doit=1;
                    }
                }
                
                /* Handle blendin & blendout */
                if (doit){
                    /* Handle blendin */
                    
                    if (strip->blendin>0.0 && stripframe<=strip->blendin && scene_cfra>=strip->start){
                        blendfac = stripframe/strip->blendin;
                    }
                    else if (strip->blendout>0.0 && stripframe>=(length-strip->blendout) && scene_cfra<=strip->end){
                        blendfac = (length-stripframe)/(strip->blendout);
                    }
                    else
                        blendfac = 1;
                    
                    if(blocktype==ID_AR) {/* Blend this pose with the accumulated pose */
                        /* offset bone, for matching cycles */
                        blend_pose_offset_bone (strip, ob->pose, tpose, blendfac, strip->mode);
                        
                        blend_poses (ob->pose, tpose, blendfac, strip->mode);
                        if(dostride)
                            blend_pose_strides (ob->pose, tpose, blendfac, strip->mode);
                    }
                    else {
                        blend_ipochannels(&chanbase, &tchanbase, blendfac, strip->mode);
                        BLI_freelistN(&tchanbase);
                    }
                }
            }                   
        }
    }
    
    if(blocktype==ID_OB) {
        execute_ipochannels(&chanbase);
    }
    else if(blocktype==ID_AR) {
        /* apply stride offset to object */
        add_v3_v3(ob->obmat[3], ob->pose->stride_offset);
    }
    
    /* free */
    if (tpose)
        free_pose(tpose);
    if(chanbase.first)
        BLI_freelistN(&chanbase);
}

#endif // XXX OLD ANIMATION SYSTEM (TO BE REMOVED)