blender/source/blender/editors/animation/keyframing.c

/**
 * $Id$
 *
 * ***** 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) 2009 Blender Foundation, Joshua Leung
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Joshua Leung (full recode)
 *
 * ***** END GPL LICENSE BLOCK *****
 */
 
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <math.h>
#include <float.h>

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_dynstr.h"

#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_constraint_types.h"
#include "DNA_key_types.h"
#include "DNA_material_types.h"
#include "DNA_scene_types.h"

#include "BKE_animsys.h"
#include "BKE_action.h"
#include "BKE_constraint.h"
#include "BKE_depsgraph.h"
#include "BKE_fcurve.h"
#include "BKE_nla.h"
#include "BKE_global.h"
#include "BKE_utildefines.h"
#include "BKE_context.h"
#include "BKE_report.h"
#include "BKE_key.h"
#include "BKE_material.h"

#include "ED_anim_api.h"
#include "ED_keyframing.h"
#include "ED_keyframes_edit.h"
#include "ED_screen.h"

#include "UI_interface.h"

#include "WM_api.h"
#include "WM_types.h"

#include "RNA_access.h"
#include "RNA_define.h"

#include "anim_intern.h"

/* ************************************************** */
/* Keyframing Setting Wrangling */

/* Get the active settings for keyframing settings from context (specifically the given scene) */
short ANIM_get_keyframing_flags (Scene *scene, short incl_mode)
{
	short flag = 0;
	
	/* standard flags */
	{
		/* visual keying */
		if (IS_AUTOKEY_FLAG(AUTOMATKEY)) 
			flag |= INSERTKEY_MATRIX;
		
		/* only needed */
		if (IS_AUTOKEY_FLAG(INSERTNEEDED)) 
			flag |= INSERTKEY_NEEDED;
		
		/* default F-Curve color mode - RGB from XYZ indicies */
		if (IS_AUTOKEY_FLAG(XYZ2RGB)) 
			flag |= INSERTKEY_XYZ2RGB;
	}
		
	/* only if including settings from the autokeying mode... */
	if (incl_mode) 
	{ 
		/* keyframing mode - only replace existing keyframes */
		if (IS_AUTOKEY_MODE(scene, EDITKEYS)) 
			flag |= INSERTKEY_REPLACE;
	}
		
	return flag;
}

/* ******************************************* */
/* Animation Data Validation */

/* Get (or add relevant data to be able to do so) the Active Action for the given 
 * Animation Data block, given an ID block where the Animation Data should reside.
 */
bAction *verify_adt_action (ID *id, short add)
{
	AnimData *adt;
	
	/* init animdata if none available yet */
	adt= BKE_animdata_from_id(id);
	if ((adt == NULL) && (add))
		adt= BKE_id_add_animdata(id);
	if (adt == NULL) { 
		/* if still none (as not allowed to add, or ID doesn't have animdata for some reason) */
		printf("ERROR: Couldn't add AnimData (ID = %s) \n", (id) ? (id->name) : "<None>");
		return NULL;
	}
		
	/* init action if none available yet */
	// TODO: need some wizardry to handle NLA stuff correct
	if ((adt->action == NULL) && (add)) {
		char actname[sizeof(id->name)-2];
		BLI_snprintf(actname, sizeof(actname), "%sAction", id->name+2);
		adt->action= add_empty_action(actname);
	}
		
	/* return the action */
	return adt->action;
}

/* Get (or add relevant data to be able to do so) F-Curve from the Active Action, 
 * for the given Animation Data block. This assumes that all the destinations are valid.
 */
FCurve *verify_fcurve (bAction *act, const char group[], const char rna_path[], const int array_index, short add)
{
	bActionGroup *grp;
	FCurve *fcu;
	
	/* sanity checks */
	if ELEM(NULL, act, rna_path)
		return NULL;
		
	/* try to find f-curve matching for this setting 
	 *	- add if not found and allowed to add one
	 *		TODO: add auto-grouping support? how this works will need to be resolved
	 */
	if (act)
		fcu= list_find_fcurve(&act->curves, rna_path, array_index);
	else
		fcu= NULL;
	
	if ((fcu == NULL) && (add)) {
		/* use default settings to make a F-Curve */
		fcu= MEM_callocN(sizeof(FCurve), "FCurve");
		
		fcu->flag = (FCURVE_VISIBLE|FCURVE_AUTO_HANDLES|FCURVE_SELECTED);
		if (act->curves.first==NULL) 
			fcu->flag |= FCURVE_ACTIVE;	/* first one added active */
			
		/* store path - make copy, and store that */
		fcu->rna_path= BLI_strdupn(rna_path, strlen(rna_path));
		fcu->array_index= array_index;
		
		/* if a group name has been provided, try to add or find a group, then add F-Curve to it */
		if (group) {
			/* try to find group */
			grp= action_groups_find_named(act, group);
			
			/* no matching groups, so add one */
			if (grp == NULL)
				grp= action_groups_add_new(act, group);
			
			/* add F-Curve to group */
			action_groups_add_channel(act, grp, fcu);
		}
		else {
			/* just add F-Curve to end of Action's list */
			BLI_addtail(&act->curves, fcu);
		}
	}
	
	/* return the F-Curve */
	return fcu;
}

/* ************************************************** */
/* KEYFRAME INSERTION */

/* -------------- BezTriple Insertion -------------------- */

/* This function adds a given BezTriple to an F-Curve. It will allocate 
 * memory for the array if needed, and will insert the BezTriple into a
 * suitable place in chronological order.
 * 
 * NOTE: any recalculate of the F-Curve that needs to be done will need to 
 * 		be done by the caller.
 */
int insert_bezt_fcurve (FCurve *fcu, BezTriple *bezt, short flag)
{
	int i= 0;
	
	/* are there already keyframes? */
	if (fcu->bezt) {
		short replace = -1;
		i = binarysearch_bezt_index(fcu->bezt, bezt->vec[1][0], fcu->totvert, &replace);
		
		/* replace an existing keyframe? */
		if (replace) {			
			/* sanity check: 'i' may in rare cases exceed arraylen */
			if ((i >= 0) && (i < fcu->totvert)) {
				/* just change the values when replacing, so as to not overwrite handles */
				BezTriple *dst= (fcu->bezt + i);
				float dy= bezt->vec[1][1] - dst->vec[1][1];
				
				/* just apply delta value change to the handle values */
				dst->vec[0][1] += dy;
				dst->vec[1][1] += dy;
				dst->vec[2][1] += dy;
				
				// TODO: perform some other operations?
			}
		}
		/* keyframing modes allow to not replace keyframe */
		else if ((flag & INSERTKEY_REPLACE) == 0) {
			/* insert new - if we're not restricted to replacing keyframes only */
			BezTriple *newb= MEM_callocN((fcu->totvert+1)*sizeof(BezTriple), "beztriple");
			
			/* add the beztriples that should occur before the beztriple to be pasted (originally in fcu) */
			if (i > 0)
				memcpy(newb, fcu->bezt, i*sizeof(BezTriple));
			
			/* add beztriple to paste at index i */
			*(newb + i)= *bezt;
			
			/* add the beztriples that occur after the beztriple to be pasted (originally in fcu) */
			if (i < fcu->totvert) 
				memcpy(newb+i+1, fcu->bezt+i, (fcu->totvert-i)*sizeof(BezTriple));
			
			/* replace (+ free) old with new, only if necessary to do so */
			MEM_freeN(fcu->bezt);
			fcu->bezt= newb;
			
			fcu->totvert++;
		}
	}
	/* no keyframes already, but can only add if...
	 *	1) keyframing modes say that keyframes can only be replaced, so adding new ones won't know
	 *	2) there are no samples on the curve
	 *		// NOTE: maybe we may want to allow this later when doing samples -> bezt conversions, 
	 *		// but for now, having both is asking for trouble
	 */
	else if ((flag & INSERTKEY_REPLACE)==0 && (fcu->fpt==NULL)) {
		/* create new keyframes array */
		fcu->bezt= MEM_callocN(sizeof(BezTriple), "beztriple");
		*(fcu->bezt)= *bezt;
		fcu->totvert= 1;
	}
	/* cannot add anything */
	else {
		/* return error code -1 to prevent any misunderstandings */
		return -1;
	}
	
	
	/* we need to return the index, so that some tools which do post-processing can 
	 * detect where we added the BezTriple in the array
	 */
	return i;
}

/* This function is a wrapper for insert_bezt_fcurve_internal(), and should be used when
 * adding a new keyframe to a curve, when the keyframe doesn't exist anywhere else yet. 
 * It returns the index at which the keyframe was added.
 */
int insert_vert_fcurve (FCurve *fcu, float x, float y, short flag)
{
	BezTriple beztr;
	int a;
	
	/* set all three points, for nicer start position 
	 * NOTE: +/- 1 on vec.x for left and right handles is so that 'free' handles work ok...
	 */
	memset(&beztr, 0, sizeof(BezTriple));
	beztr.vec[0][0]= x-1.0f; 
	beztr.vec[0][1]= y;
	beztr.vec[1][0]= x;
	beztr.vec[1][1]= y;
	beztr.vec[2][0]= x+1.0f;
	beztr.vec[2][1]= y;
	beztr.ipo= U.ipo_new; /* use default interpolation mode here... */
	beztr.f1= beztr.f2= beztr.f3= SELECT;
	beztr.h1= beztr.h2= U.keyhandles_new; /* use default handle type here */
	//BEZKEYTYPE(&beztr)= scene->keytype; /* default keyframe type */
	
	/* add temp beztriple to keyframes */
	a= insert_bezt_fcurve(fcu, &beztr, flag);
	
	/* what if 'a' is a negative index? 
	 * for now, just exit to prevent any segfaults
	 */
	if (a < 0) return -1;
	
	/* don't recalculate handles if fast is set
	 *	- this is a hack to make importers faster
	 *	- we may calculate twice (due to autohandle needing to be calculated twice)
	 */
	if ((flag & INSERTKEY_FAST) == 0) 
		calchandles_fcurve(fcu);
	
	/* set handletype and interpolation */
	if ((fcu->totvert > 2) && (flag & INSERTKEY_REPLACE)==0) {
		BezTriple *bezt= (fcu->bezt + a);
		
		/* set interpolation from previous (if available) */
		// FIXME: this doesn't work if user tweaked the interpolation specifically, and they were just overwriting some existing key in the process...
		if (a > 0) bezt->ipo= (bezt-1)->ipo;
		else if (a < fcu->totvert-1) bezt->ipo= (bezt+1)->ipo;
			
		/* don't recalculate handles if fast is set
		 *	- this is a hack to make importers faster
		 *	- we may calculate twice (due to autohandle needing to be calculated twice)
		 */
		if ((flag & INSERTKEY_FAST) == 0) 
			calchandles_fcurve(fcu);
	}
	
	/* return the index at which the keyframe was added */
	return a;
}

/* -------------- 'Smarter' Keyframing Functions -------------------- */
/* return codes for new_key_needed */
enum {
	KEYNEEDED_DONTADD = 0,
	KEYNEEDED_JUSTADD,
	KEYNEEDED_DELPREV,
	KEYNEEDED_DELNEXT
} eKeyNeededStatus;

/* This helper function determines whether a new keyframe is needed */
/* Cases where keyframes should not be added:
 *	1. Keyframe to be added bewteen two keyframes with similar values
 *	2. Keyframe to be added on frame where two keyframes are already situated
 *	3. Keyframe lies at point that intersects the linear line between two keyframes
 */
static short new_key_needed (FCurve *fcu, float cFrame, float nValue) 
{
	BezTriple *bezt=NULL, *prev=NULL;
	int totCount, i;
	float valA = 0.0f, valB = 0.0f;
	
	/* safety checking */
	if (fcu == NULL) return KEYNEEDED_JUSTADD;
	totCount= fcu->totvert;
	if (totCount == 0) return KEYNEEDED_JUSTADD;
	
	/* loop through checking if any are the same */
	bezt= fcu->bezt;
	for (i=0; i<totCount; i++) {
		float prevPosi=0.0f, prevVal=0.0f;
		float beztPosi=0.0f, beztVal=0.0f;
			
		/* get current time+value */	
		beztPosi= bezt->vec[1][0];
		beztVal= bezt->vec[1][1];
			
		if (prev) {
			/* there is a keyframe before the one currently being examined */		
			
			/* get previous time+value */
			prevPosi= prev->vec[1][0];
			prevVal= prev->vec[1][1];
			
			/* keyframe to be added at point where there are already two similar points? */
			if (IS_EQ(prevPosi, cFrame) && IS_EQ(beztPosi, cFrame) && IS_EQ(beztPosi, prevPosi)) {
				return KEYNEEDED_DONTADD;
			}
			
			/* keyframe between prev+current points ? */
			if ((prevPosi <= cFrame) && (cFrame <= beztPosi)) {
				/* is the value of keyframe to be added the same as keyframes on either side ? */
				if (IS_EQ(prevVal, nValue) && IS_EQ(beztVal, nValue) && IS_EQ(prevVal, beztVal)) {
					return KEYNEEDED_DONTADD;
				}
				else {
					float realVal;
					
					/* get real value of curve at that point */
					realVal= evaluate_fcurve(fcu, cFrame);
					
					/* compare whether it's the same as proposed */
					if (IS_EQ(realVal, nValue)) 
						return KEYNEEDED_DONTADD;
					else 
						return KEYNEEDED_JUSTADD;
				}
			}
			
			/* new keyframe before prev beztriple? */
			if (cFrame < prevPosi) {
				/* A new keyframe will be added. However, whether the previous beztriple
				 * stays around or not depends on whether the values of previous/current
				 * beztriples and new keyframe are the same.
				 */
				if (IS_EQ(prevVal, nValue) && IS_EQ(beztVal, nValue) && IS_EQ(prevVal, beztVal))
					return KEYNEEDED_DELNEXT;
				else 
					return KEYNEEDED_JUSTADD;
			}
		}
		else {
			/* just add a keyframe if there's only one keyframe 
			 * and the new one occurs before the exisiting one does.
			 */
			if ((cFrame < beztPosi) && (totCount==1))
				return KEYNEEDED_JUSTADD;
		}
		
		/* continue. frame to do not yet passed (or other conditions not met) */
		if (i < (totCount-1)) {
			prev= bezt;
			bezt++;
		}
		else
			break;
	}
	
	/* Frame in which to add a new-keyframe occurs after all other keys
	 * -> If there are at least two existing keyframes, then if the values of the
	 *	 last two keyframes and the new-keyframe match, the last existing keyframe
	 *	 gets deleted as it is no longer required.
	 * -> Otherwise, a keyframe is just added. 1.0 is added so that fake-2nd-to-last
	 *	 keyframe is not equal to last keyframe.
	 */
	bezt= (fcu->bezt + (fcu->totvert - 1));
	valA= bezt->vec[1][1];
	
	if (prev)
		valB= prev->vec[1][1];
	else 
		valB= bezt->vec[1][1] + 1.0f; 
		
	if (IS_EQ(valA, nValue) && IS_EQ(valA, valB)) 
		return KEYNEEDED_DELPREV;
	else 
		return KEYNEEDED_JUSTADD;
}

/* ------------------ RNA Data-Access Functions ------------------ */

/* Try to read value using RNA-properties obtained already */
static float setting_get_rna_value (PointerRNA *ptr, PropertyRNA *prop, int index)
{
	float value= 0.0f;
	
	switch (RNA_property_type(prop)) {
		case PROP_BOOLEAN:
			if (RNA_property_array_length(ptr, prop))
				value= (float)RNA_property_boolean_get_index(ptr, prop, index);
			else
				value= (float)RNA_property_boolean_get(ptr, prop);
			break;
		case PROP_INT:
			if (RNA_property_array_length(ptr, prop))
				value= (float)RNA_property_int_get_index(ptr, prop, index);
			else
				value= (float)RNA_property_int_get(ptr, prop);
			break;
		case PROP_FLOAT:
			if (RNA_property_array_length(ptr, prop))
				value= RNA_property_float_get_index(ptr, prop, index);
			else
				value= RNA_property_float_get(ptr, prop);
			break;
		case PROP_ENUM:
			value= (float)RNA_property_enum_get(ptr, prop);
			break;
		default:
			break;
	}
	
	return value;
}

/* ------------------ 'Visual' Keyframing Functions ------------------ */

/* internal status codes for visualkey_can_use */
enum {
	VISUALKEY_NONE = 0,
	VISUALKEY_LOC,
	VISUALKEY_ROT,
};

/* This helper function determines if visual-keyframing should be used when  
 * inserting keyframes for the given channel. As visual-keyframing only works
 * on Object and Pose-Channel blocks, this should only get called for those 
 * blocktypes, when using "standard" keying but 'Visual Keying' option in Auto-Keying 
 * settings is on.
 */
static short visualkey_can_use (PointerRNA *ptr, PropertyRNA *prop)
{
	bConstraint *con= NULL;
	short searchtype= VISUALKEY_NONE;
	char *identifier= NULL;
	
	/* validate data */
	// TODO: this check is probably not needed, but it won't hurt
	if (ELEM3(NULL, ptr, ptr->data, prop))
		return 0;
		
	/* get first constraint and determine type of keyframe constraints to check for 
	 * 	- constraints can be on either Objects or PoseChannels, so we only check if the
	 *	  ptr->type is RNA_Object or RNA_PoseBone, which are the RNA wrapping-info for
	 *  	  those structs, allowing us to identify the owner of the data 
	 */
	if (ptr->type == &RNA_Object) {
		/* Object */
		Object *ob= (Object *)ptr->data;
		
		con= ob->constraints.first;
		identifier= (char *)RNA_property_identifier(prop);
	}
	else if (ptr->type == &RNA_PoseBone) {
		/* Pose Channel */
		bPoseChannel *pchan= (bPoseChannel *)ptr->data;
		
		con= pchan->constraints.first;
		identifier= (char *)RNA_property_identifier(prop);
	}
	
	/* check if any data to search using */
	if (ELEM(NULL, con, identifier))
		return 0;
		
	/* location or rotation identifiers only... */
	if (strstr(identifier, "location"))
		searchtype= VISUALKEY_LOC;
	else if (strstr(identifier, "rotation"))
		searchtype= VISUALKEY_ROT;
	else {
		printf("visualkey_can_use() failed: identifier - '%s' \n", identifier);
		return 0;
	}
	
	
	/* only search if a searchtype and initial constraint are available */
	if (searchtype && con) {
		for (; con; con= con->next) {
			/* only consider constraint if it is not disabled, and has influence */
			if (con->flag & CONSTRAINT_DISABLE) continue;
			if (con->enforce == 0.0f) continue;
			
			/* some constraints may alter these transforms */
			switch (con->type) {
				/* multi-transform constraints */
				case CONSTRAINT_TYPE_CHILDOF:
					return 1;
				case CONSTRAINT_TYPE_TRANSFORM:
					return 1;
				case CONSTRAINT_TYPE_FOLLOWPATH:
					return 1;
				case CONSTRAINT_TYPE_KINEMATIC:
					return 1;
					
				/* single-transform constraits  */
				case CONSTRAINT_TYPE_TRACKTO:
					if (searchtype==VISUALKEY_ROT) return 1;
					break;
				case CONSTRAINT_TYPE_ROTLIMIT:
					if (searchtype==VISUALKEY_ROT) return 1;
					break;
				case CONSTRAINT_TYPE_LOCLIMIT:
					if (searchtype==VISUALKEY_LOC) return 1;
					break;
				case CONSTRAINT_TYPE_ROTLIKE:
					if (searchtype==VISUALKEY_ROT) return 1;
					break;
				case CONSTRAINT_TYPE_DISTLIMIT:
					if (searchtype==VISUALKEY_LOC) return 1;
					break;
				case CONSTRAINT_TYPE_LOCLIKE:
					if (searchtype==VISUALKEY_LOC) return 1;
					break;
				case CONSTRAINT_TYPE_LOCKTRACK:
					if (searchtype==VISUALKEY_ROT) return 1;
					break;
				case CONSTRAINT_TYPE_MINMAX:
					if (searchtype==VISUALKEY_LOC) return 1;
					break;
				
				default:
					break;
			}
		}
	}
	
	/* when some condition is met, this function returns, so here it can be 0 */
	return 0;
}

/* This helper function extracts the value to use for visual-keyframing 
 * In the event that it is not possible to perform visual keying, try to fall-back
 * to using the default method. Assumes that all data it has been passed is valid.
 */
static float visualkey_get_value (PointerRNA *ptr, PropertyRNA *prop, int array_index)
{
	char *identifier= (char *)RNA_property_identifier(prop);
	
	/* handle for Objects or PoseChannels only 
	 * 	- constraints can be on either Objects or PoseChannels, so we only check if the
	 *	  ptr->type is RNA_Object or RNA_PoseBone, which are the RNA wrapping-info for
	 *  	  those structs, allowing us to identify the owner of the data 
	 *	- assume that array_index will be sane
	 */
	if (ptr->type == &RNA_Object) {
		Object *ob= (Object *)ptr->data;
		
		/* parented objects are not supported, as the effects of the parent
		 * are included in the matrix, which kindof beats the point
		 */
		if (ob->parent == NULL) {
			/* only Location or Rotation keyframes are supported now */
			if (strstr(identifier, "location")) {
				return ob->obmat[3][array_index];
			}
			else if (strstr(identifier, "rotation")) {
				float eul[3];
				
				mat4_to_eul( eul,ob->obmat);
				return eul[array_index];
			}
		}
	}
	else if (ptr->type == &RNA_PoseBone) {
		Object *ob= (Object *)ptr->id.data; /* we assume that this is always set, and is an object */
		bPoseChannel *pchan= (bPoseChannel *)ptr->data;
		float tmat[4][4];
		
		/* Although it is not strictly required for this particular space conversion, 
		 * arg1 must not be null, as there is a null check for the other conversions to
		 * be safe. Therefore, the active object is passed here, and in many cases, this
		 * will be what owns the pose-channel that is getting this anyway.
		 */
		copy_m4_m4(tmat, pchan->pose_mat);
		constraint_mat_convertspace(ob, pchan, tmat, CONSTRAINT_SPACE_POSE, CONSTRAINT_SPACE_LOCAL);
		
		/* Loc, Rot/Quat keyframes are supported... */
		if (strstr(identifier, "location")) {
			/* only use for non-connected bones */
			if ((pchan->bone->parent) && !(pchan->bone->flag & BONE_CONNECTED))
				return tmat[3][array_index];
			else if (pchan->bone->parent == NULL)
				return tmat[3][array_index];
		}
		else if (strstr(identifier, "rotation_euler")) {
			float eul[3];
			
			/* euler-rotation test before standard rotation, as standard rotation does quats */
			mat4_to_eulO( eul, pchan->rotmode,tmat);
			return eul[array_index];
		}
		else if (strstr(identifier, "rotation_quaternion")) {
			float trimat[3][3], quat[4];
			
			copy_m3_m4(trimat, tmat);
			mat3_to_quat_is_ok( quat,trimat);
			
			return quat[array_index];
		}
		// TODO: axis-angle...
	}
	
	/* as the function hasn't returned yet, read value from system in the default way */
	return setting_get_rna_value(ptr, prop, array_index);
}

/* ------------------------- Insert Key API ------------------------- */

/* Secondary Keyframing API call: 
 * 	Use this when validation of necessary animation data is not necessary, since an RNA-pointer to the necessary
 *	data being keyframed, and a pointer to the F-Curve to use have both been provided.
 *
 *	The flag argument is used for special settings that alter the behaviour of
 *	the keyframe insertion. These include the 'visual' keyframing modes, quick refresh,
 *	and extra keyframe filtering.
 */
short insert_keyframe_direct (PointerRNA ptr, PropertyRNA *prop, FCurve *fcu, float cfra, short flag)
{
	float curval= 0.0f;
	
	/* no F-Curve to add keyframe to? */
	if (fcu == NULL) {
		printf("ERROR: no F-Curve to add keyframes to \n");
		return 0;
	}
	/* F-Curve not editable? */
	if ( (fcu->flag & FCURVE_PROTECTED) || ((fcu->grp) && (fcu->grp->flag & AGRP_PROTECTED)) ) {
		if (G.f & G_DEBUG)
			printf("WARNING: not inserting keyframe for locked F-Curve \n");
		return 0;
	}
	
	/* if no property given yet, try to validate from F-Curve info */
	if ((ptr.id.data == NULL) && (ptr.data==NULL)) {
		printf("ERROR: no RNA-pointer available to retrieve values for keyframing from\n");
		return 0;
	}
	if (prop == NULL) {
		PointerRNA tmp_ptr;
		
		/* try to get property we should be affecting */
		if ((RNA_path_resolve(&ptr, fcu->rna_path, &tmp_ptr, &prop) == 0) || (prop == NULL)) {
			/* property not found... */
			char *idname= (ptr.id.data) ? ((ID *)ptr.id.data)->name : "<No ID-Pointer>";
			
			printf("Insert Key: Could not insert keyframe, as RNA Path is invalid for the given ID (ID = %s, Path = %s)\n", idname, fcu->rna_path);
			return 0;
		}
		else {
			/* property found, so overwrite 'ptr' to make later code easier */
			ptr= tmp_ptr;
		}
	}
	
	/* set additional flags for the F-Curve (i.e. only integer values) */
	fcu->flag &= ~(FCURVE_INT_VALUES|FCURVE_DISCRETE_VALUES);
	switch (RNA_property_type(prop)) {
		case PROP_FLOAT:
			/* do nothing */
			break;
		case PROP_INT:
			/* do integer (only 'whole' numbers) interpolation between all points */
			fcu->flag |= FCURVE_INT_VALUES;
			break;
		default:
			/* do 'discrete' (i.e. enum, boolean values which cannot take any intermediate
			 * values at all) interpolation between all points
			 *	- however, we must also ensure that evaluated values are only integers still
			 */
			fcu->flag |= (FCURVE_DISCRETE_VALUES|FCURVE_INT_VALUES);
			break;
	}
	
	/* obtain value to give keyframe */
	if ( (flag & INSERTKEY_MATRIX) && 
		 (visualkey_can_use(&ptr, prop)) ) 
	{
		/* visual-keying is only available for object and pchan datablocks, as 
		 * it works by keyframing using a value extracted from the final matrix 
		 * instead of using the kt system to extract a value.
		 */
		curval= visualkey_get_value(&ptr, prop, fcu->array_index);
	}
	else {
		/* read value from system */
		curval= setting_get_rna_value(&ptr, prop, fcu->array_index);
	}
	
	/* only insert keyframes where they are needed */
	if (flag & INSERTKEY_NEEDED) {
		short insert_mode;
		
		/* check whether this curve really needs a new keyframe */
		insert_mode= new_key_needed(fcu, cfra, curval);
		
		/* insert new keyframe at current frame */
		if (insert_mode)
			insert_vert_fcurve(fcu, cfra, curval, flag);
		
		/* delete keyframe immediately before/after newly added */
		switch (insert_mode) {
			case KEYNEEDED_DELPREV:
				delete_fcurve_key(fcu, fcu->totvert-2, 1);
				break;
			case KEYNEEDED_DELNEXT:
				delete_fcurve_key(fcu, 1, 1);
				break;
		}
		
		/* only return success if keyframe added */
		if (insert_mode)
			return 1;
	}
	else {
		/* just insert keyframe */
		insert_vert_fcurve(fcu, cfra, curval, flag);
		
		/* return success */
		return 1;
	}
	
	/* failed */
	return 0;
}

/* Main Keyframing API call:
 *	Use this when validation of necessary animation data is necessary, since it may not exist yet.
 *	
 *	The flag argument is used for special settings that alter the behaviour of
 *	the keyframe insertion. These include the 'visual' keyframing modes, quick refresh,
 *	and extra keyframe filtering.
 *
 *	index of -1 keys all array indices
 */
short insert_keyframe (ID *id, bAction *act, const char group[], const char rna_path[], int array_index, float cfra, short flag)
{	
	PointerRNA id_ptr, ptr;
	PropertyRNA *prop = NULL;
	FCurve *fcu;
	int array_index_max= array_index+1;
	int ret= 0;
	
	/* validate pointer first - exit if failure */
	if (id == NULL) {
		printf("Insert Key: no ID-block to insert keyframe in (Path = %s) \n", rna_path);
		return 0;
	}
	
	RNA_id_pointer_create(id, &id_ptr);
	if ((RNA_path_resolve(&id_ptr, rna_path, &ptr, &prop) == 0) || (prop == NULL)) {
		printf("Insert Key: Could not insert keyframe, as RNA Path is invalid for the given ID (ID = %s, Path = %s)\n", 
			(id)? id->name : "<Missing ID-Block>", rna_path);
		return 0;
	}
	
	/* if no action is provided, keyframe to the default one attached to this ID-block */
	if (act == NULL) {
		AnimData *adt= BKE_animdata_from_id(id);
		
		/* get action to add F-Curve+keyframe to */
		act= verify_adt_action(id, 1);
		
		if (act == NULL) {
			printf("Insert Key: Could not insert keyframe, as this type does not support animation data (ID = %s, Path = %s)\n", id->name, rna_path);
			return 0;
		}
		
		/* apply NLA-mapping to frame to use (if applicable) */
		cfra= BKE_nla_tweakedit_remap(adt, cfra, NLATIME_CONVERT_UNMAP);
	}

#if 0
	/* apply special time tweaking */
		// XXX check on this stuff...
	if (GS(id->name) == ID_OB) {
		//Object *ob= (Object *)id;
		
		/* ancient time-offset cruft */
		//if ( (ob->ipoflag & OB_OFFS_OB) && (give_timeoffset(ob)) ) {
		//	/* actually frametofloat calc again! */
		//	cfra-= give_timeoffset(ob)*scene->r.framelen;
		//}
	}
#endif
	
	/* key entire array convenience method */
	if (array_index == -1) { 
		array_index= 0;
		array_index_max= RNA_property_array_length(&ptr, prop);
		
		/* for single properties, increase max_index so that the property itself gets included,
		 * but don't do this for standard arrays since that can cause corruption issues 
		 * (extra unused curves)
		 */
		if (array_index_max == array_index)
			array_index_max++;
	}
	
	/* will only loop once unless the array index was -1 */
	for (; array_index < array_index_max; array_index++) {
		/* make sure the F-Curve exists 
		 *	- if we're replacing keyframes only, DO NOT create new F-Curves if they do not exist yet
		 *	  but still try to get the F-Curve if it exists...
		 */
		fcu= verify_fcurve(act, group, rna_path, array_index, (flag & INSERTKEY_REPLACE)==0);
		
		/* we may not have a F-Curve when we're replacing only... */
		if (fcu) {
			/* set color mode if the F-Curve is new (i.e. without any keyframes) */
			if ((fcu->totvert == 0) && (flag & INSERTKEY_XYZ2RGB)) {
				/* for Loc/Rot/Scale and also Color F-Curves, the color of the F-Curve in the Graph Editor,
				 * is determined by the array index for the F-Curve
				 */
				if (ELEM4(RNA_property_subtype(prop), PROP_TRANSLATION, PROP_XYZ, PROP_EULER, PROP_COLOR)) {
					fcu->color_mode= FCURVE_COLOR_AUTO_RGB;
				}
			}
			
			/* insert keyframe */
			ret += insert_keyframe_direct(ptr, prop, fcu, cfra, flag);
		}
	}
	
	return ret;
}

/* ************************************************** */
/* KEYFRAME DELETION */

/* Main Keyframing API call:
 *	Use this when validation of necessary animation data isn't necessary as it
 *	already exists. It will delete a keyframe at the current frame.
 *	
 *	The flag argument is used for special settings that alter the behaviour of
 *	the keyframe deletion. These include the quick refresh options.
 */
short delete_keyframe (ID *id, bAction *act, const char group[], const char rna_path[], int array_index, float cfra, short flag)
{
	AnimData *adt= BKE_animdata_from_id(id);
	PointerRNA id_ptr, ptr;
	PropertyRNA *prop;
	int array_index_max= array_index+1;
	int ret= 0;
	
	/* sanity checks */
	if ELEM(NULL, id, adt) {
		printf("ERROR: no ID-block and/or AnimData to delete keyframe from \n");
		return 0;
	}
	
	/* validate pointer first - exit if failure */
	RNA_id_pointer_create(id, &id_ptr);
	if ((RNA_path_resolve(&id_ptr, rna_path, &ptr, &prop) == 0) || (prop == NULL)) {
		printf("Delete Key: Could not delete keyframe, as RNA Path is invalid for the given ID (ID = %s, Path = %s)\n", id->name, rna_path);
		return 0;
	}
	
	/* get F-Curve
	 * Note: here is one of the places where we don't want new Action + F-Curve added!
	 * 		so 'add' var must be 0
	 */
	if (act == NULL) {
		/* if no action is provided, use the default one attached to this ID-block 
		 * 	- if it doesn't exist, then we're out of options...
		 */
		if (adt->action) {
			act= adt->action;
			
			/* apply NLA-mapping to frame to use (if applicable) */
			cfra= BKE_nla_tweakedit_remap(adt, cfra, NLATIME_CONVERT_UNMAP); 
		}
		else {
			printf("ERROR: no Action to delete keyframes from for ID = %s \n", id->name);
			return 0;
		}
	}
	
#if 0
	/* apply special time tweaking */
		// XXX check on this stuff...
	if (GS(id->name) == ID_OB) {
		//Object *ob= (Object *)id;
		
		/* ancient time-offset cruft */
		//if ( (ob->ipoflag & OB_OFFS_OB) && (give_timeoffset(ob)) ) {
		//	/* actually frametofloat calc again! */
		//	cfra-= give_timeoffset(ob)*scene->r.framelen;
		//}
	}
#endif
	
	/* key entire array convenience method */
	if (array_index == -1) { 
		array_index= 0;
		array_index_max= RNA_property_array_length(&ptr, prop);
		
		/* for single properties, increase max_index so that the property itself gets included,
		 * but don't do this for standard arrays since that can cause corruption issues 
		 * (extra unused curves)
		 */
		if (array_index_max == array_index)
			array_index_max++;
	}
	
	/* will only loop once unless the array index was -1 */
	for (; array_index < array_index_max; array_index++) {
		FCurve *fcu= verify_fcurve(act, group, rna_path, array_index, 0);
		short found = -1;
		int i;
		
		/* check if F-Curve exists and/or whether it can be edited */
		if (fcu == NULL)
			continue;
			
		if ( (fcu->flag & FCURVE_PROTECTED) || ((fcu->grp) && (fcu->grp->flag & AGRP_PROTECTED)) ) {
			if (G.f & G_DEBUG)
				printf("WARNING: not inserting keyframe for locked F-Curve \n");
			continue;
		}
		
		/* try to find index of beztriple to get rid of */
		i = binarysearch_bezt_index(fcu->bezt, cfra, fcu->totvert, &found);
		if (found) {			
			/* delete the key at the index (will sanity check + do recalc afterwards) */
			delete_fcurve_key(fcu, i, 1);
			
			/* Only delete curve too if it won't be doing anything anymore */
			if ((fcu->totvert == 0) && (list_has_suitable_fmodifier(&fcu->modifiers, 0, FMI_TYPE_GENERATE_CURVE) == 0))
				ANIM_fcurve_delete_from_animdata(NULL, adt, fcu);
			
			/* return success */
			ret++;
		}
	}
	
	/* return success/failure */
	return ret;
}

/* ******************************************* */
/* KEYFRAME MODIFICATION */

/* mode for commonkey_modifykey */
enum {
	COMMONKEY_MODE_INSERT = 0,
	COMMONKEY_MODE_DELETE,
} eCommonModifyKey_Modes;

/* Polling callback for use with ANIM_*_keyframe() operators
 * This is based on the standard ED_operator_areaactive callback,
 * except that it does special checks for a few spacetypes too...
 */
static int modify_key_op_poll(bContext *C)
{
	ScrArea *sa= CTX_wm_area(C);
	Scene *scene= CTX_data_scene(C);
	SpaceOops *so= CTX_wm_space_outliner(C);
	
	/* if no area or active scene */
	if (ELEM(NULL, sa, scene)) 
		return 0;
	
	/* if Outliner, don't allow in some views */
	if (so) {
		if (ELEM4(so->outlinevis, SO_GROUPS, SO_LIBRARIES, SO_VERSE_SESSION, SO_VERSE_SESSION))
			return 0;
		if (ELEM3(so->outlinevis, SO_SEQUENCE, SO_USERDEF, SO_KEYMAP))
			return 0;
	}
	
	/* TODO: checks for other space types can be added here */
	
	/* should be fine */
	return 1;
}

/* Insert Key Operator ------------------------ */

static int insert_key_exec (bContext *C, wmOperator *op)
{
	Scene *scene= CTX_data_scene(C);
	KeyingSet *ks= NULL;
	int type= RNA_int_get(op->ptr, "type");
	float cfra= (float)CFRA; // XXX for now, don't bother about all the yucky offset crap
	short success;
	
	/* type is the Keying Set the user specified to use when calling the operator:
	 *	- type == 0: use scene's active Keying Set
	 *	- type > 0: use a user-defined Keying Set from the active scene
	 *	- type < 0: use a builtin Keying Set
	 */
	if (type == 0) 
		type= scene->active_keyingset;
	if (type > 0)
		ks= BLI_findlink(&scene->keyingsets, scene->active_keyingset-1);
	else
		ks= BLI_findlink(&builtin_keyingsets, -type-1);
		
	/* report failures */
	if (ks == NULL) {
		BKE_report(op->reports, RPT_ERROR, "No active Keying Set");
		return OPERATOR_CANCELLED;
	}
	
	/* try to insert keyframes for the channels specified by KeyingSet */
	success= ANIM_apply_keyingset(C, NULL, NULL, ks, MODIFYKEY_MODE_INSERT, cfra);
	if (G.f & G_DEBUG)
		BKE_reportf(op->reports, RPT_INFO, "KeyingSet '%s' - Successfully added %d Keyframes \n", ks->name, success);
	
	/* report failure or do updates? */
	if (success == MODIFYKEY_INVALID_CONTEXT) {
		BKE_report(op->reports, RPT_ERROR, "No suitable context info for active Keying Set");
		return OPERATOR_CANCELLED;
	}
	else if (success) {
		/* if the appropriate properties have been set, make a note that we've inserted something */
		if (RNA_boolean_get(op->ptr, "confirm_success"))
			BKE_reportf(op->reports, RPT_INFO, "Successfully added %d Keyframes for KeyingSet '%s'", success, ks->name);
		
		/* send notifiers that keyframes have been changed */
		WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
	}
	else
		BKE_report(op->reports, RPT_WARNING, "Keying Set failed to insert any keyframes");
	
	/* send updates */
	DAG_ids_flush_update(0);
	
	return OPERATOR_FINISHED;
}

void ANIM_OT_keyframe_insert (wmOperatorType *ot)
{
	PropertyRNA *prop;
	
	/* identifiers */
	ot->name= "Insert Keyframe";
	ot->idname= "ANIM_OT_keyframe_insert";
	ot->description= "Insert keyframes on the current frame for all properties in the specified Keying Set";
	
	/* callbacks */
	ot->exec= insert_key_exec; 
	ot->poll= modify_key_op_poll;
	
	/* flags */
	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
	
	/* keyingset to use
	 *	- here the type is int not enum, since many of the indicies here are determined dynamically
	 */
	prop= RNA_def_int(ot->srna, "type", 0, INT_MIN, INT_MAX, "Keying Set Number", "Index (determined internally) of the Keying Set to use", 0, 1);
	RNA_def_property_flag(prop, PROP_HIDDEN);
	/* confirm whether a keyframe was added by showing a popup 
	 *	- by default, this is enabled, since this operator is assumed to be called independently
	 */
	prop= RNA_def_boolean(ot->srna, "confirm_success", 1, "Confirm Successful Insert", "Show a popup when the keyframes get successfully added");
	RNA_def_property_flag(prop, PROP_HIDDEN);
}

/* Insert Key Operator (With Menu) ------------------------ */
/* This operator checks if a menu should be shown for choosing the KeyingSet to use, 
 * then calls the menu if necessary before 
 */

static int insert_key_menu_invoke (bContext *C, wmOperator *op, wmEvent *event)
{
	Scene *scene= CTX_data_scene(C);
	
	/* if prompting or no active Keying Set, show the menu */
	if ((scene->active_keyingset == 0) || RNA_boolean_get(op->ptr, "always_prompt")) {
		/* call the menu, which will call this operator again, hence the cancelled */
		ANIM_keying_sets_menu_setup(C, op->type->name, "ANIM_OT_keyframe_insert_menu");
		return OPERATOR_CANCELLED;
	}
	else {
		/* just call the exec() on the active keyingset */
		RNA_int_set(op->ptr, "type", 0);
		RNA_boolean_set(op->ptr, "confirm_success", 1);
		
		return op->type->exec(C, op);
	}
}
 
void ANIM_OT_keyframe_insert_menu (wmOperatorType *ot)
{
	PropertyRNA *prop;
	
	/* identifiers */
	ot->name= "Insert Keyframe Menu";
	ot->idname= "ANIM_OT_keyframe_insert_menu";
	
	/* callbacks */
	ot->invoke= insert_key_menu_invoke;
	ot->exec= insert_key_exec; 
	ot->poll= ED_operator_areaactive;
	
	/* flags */
	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
	
	/* keyingset to use
	 *	- here the type is int not enum, since many of the indicies here are determined dynamically
	 */
	prop= RNA_def_int(ot->srna, "type", 0, INT_MIN, INT_MAX, "Keying Set Number", "Index (determined internally) of the Keying Set to use", 0, 1);
	RNA_def_property_flag(prop, PROP_HIDDEN);
	/* confirm whether a keyframe was added by showing a popup 
	 *	- by default, this is disabled so that if a menu is shown, this doesn't come up too
	 */
	// XXX should this just be always on?
	prop= RNA_def_boolean(ot->srna, "confirm_success", 0, "Confirm Successful Insert", "Show a popup when the keyframes get successfully added");
	RNA_def_property_flag(prop, PROP_HIDDEN);
	/* whether the menu should always be shown 
	 *	- by default, the menu should only be shown when there is no active Keying Set (2.5 behaviour),
	 *	  although in some cases it might be useful to always shown (pre 2.5 behaviour)
	 */
	prop= RNA_def_boolean(ot->srna, "always_prompt", 0, "Always Show Menu", "");
	RNA_def_property_flag(prop, PROP_HIDDEN);
}

/* Delete Key Operator ------------------------ */

static int delete_key_exec (bContext *C, wmOperator *op)
{
	Scene *scene= CTX_data_scene(C);
	KeyingSet *ks= NULL;	
	int type= RNA_int_get(op->ptr, "type");
	float cfra= (float)CFRA; // XXX for now, don't bother about all the yucky offset crap
	short success;
	
	/* type is the Keying Set the user specified to use when calling the operator:
	 *	- type == 0: use scene's active Keying Set
	 *	- type > 0: use a user-defined Keying Set from the active scene
	 *	- type < 0: use a builtin Keying Set
	 */
	if (type == 0) 
		type= scene->active_keyingset;
	if (type > 0)
		ks= BLI_findlink(&scene->keyingsets, scene->active_keyingset-1);
	else
		ks= BLI_findlink(&builtin_keyingsets, -type-1);
	
	/* report failure */
	if (ks == NULL) {
		BKE_report(op->reports, RPT_ERROR, "No active Keying Set");
		return OPERATOR_CANCELLED;
	}
	
	/* try to insert keyframes for the channels specified by KeyingSet */
	success= ANIM_apply_keyingset(C, NULL, NULL, ks, MODIFYKEY_MODE_DELETE, cfra);
	if (G.f & G_DEBUG)
		printf("KeyingSet '%s' - Successfully removed %d Keyframes \n", ks->name, success);
	
	/* report failure or do updates? */
	if (success == MODIFYKEY_INVALID_CONTEXT) {
		BKE_report(op->reports, RPT_ERROR, "No suitable context info for active Keying Set");
		return OPERATOR_CANCELLED;
	}
	else if (success) {
		/* if the appropriate properties have been set, make a note that we've inserted something */
		if (RNA_boolean_get(op->ptr, "confirm_success"))
			BKE_reportf(op->reports, RPT_INFO, "Successfully removed %d Keyframes for KeyingSet '%s'", success, ks->name);
		
		/* send notifiers that keyframes have been changed */
		WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
	}
	else
		BKE_report(op->reports, RPT_WARNING, "Keying Set failed to remove any keyframes");
	
	/* send updates */
	DAG_ids_flush_update(0);
	
	return OPERATOR_FINISHED;
}

void ANIM_OT_keyframe_delete (wmOperatorType *ot)
{
	/* identifiers */
	ot->name= "Delete Keyframe";
	ot->idname= "ANIM_OT_keyframe_delete";
	ot->description= "Delete keyframes on the current frame for all properties in the specified Keying Set";
	
	/* callbacks */
	ot->exec= delete_key_exec; 
	ot->poll= modify_key_op_poll;
	
	/* flags */
	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
	
	/* keyingset to use
	 *	- here the type is int not enum, since many of the indicies here are determined dynamically
	 */
	RNA_def_int(ot->srna, "type", 0, INT_MIN, INT_MAX, "Keying Set Number", "Index (determined internally) of the Keying Set to use", 0, 1);
	/* confirm whether a keyframe was added by showing a popup 
	 *	- by default, this is enabled, since this operator is assumed to be called independently
	 */
	RNA_def_boolean(ot->srna, "confirm_success", 1, "Confirm Successful Insert", "Show a popup when the keyframes get successfully added");
}

/* Delete Key Operator ------------------------ */

/* XXX WARNING:
 * This is currently just a basic operator, which work in 3d-view context on objects only. 
 * Should this be kept? It does have advantages over a version which requires selecting a keyingset to use...
 * -- Joshua Leung, Jan 2009
 */
 
static int delete_key_v3d_exec (bContext *C, wmOperator *op)
{
	Scene *scene= CTX_data_scene(C);
	float cfra= (float)CFRA; // XXX for now, don't bother about all the yucky offset crap
	
	// XXX more comprehensive tests will be needed
	CTX_DATA_BEGIN(C, Object*, ob, selected_objects) 
	{
		ID *id= (ID *)ob;
		FCurve *fcu, *fcn;
		short success= 0;
		
		/* loop through all curves in animdata and delete keys on this frame */
		if (ob->adt) {
			AnimData *adt= ob->adt;
			bAction *act= adt->action;
			
			for (fcu= act->curves.first; fcu; fcu= fcn) {
				fcn= fcu->next;
				success+= delete_keyframe(id, NULL, NULL, fcu->rna_path, fcu->array_index, cfra, 0);
			}
		}
		
		BKE_reportf(op->reports, RPT_INFO, "Ob '%s' - Successfully removed %d keyframes \n", id->name+2, success);
		
		ob->recalc |= OB_RECALC_OB;
	}
	CTX_DATA_END;
	
	/* send updates */
	DAG_ids_flush_update(0);
	
	WM_event_add_notifier(C, NC_OBJECT|ND_KEYS, NULL);
	
	return OPERATOR_FINISHED;
}

void ANIM_OT_keyframe_delete_v3d (wmOperatorType *ot)
{
	/* identifiers */
	ot->name= "Delete Keyframe";
	ot->idname= "ANIM_OT_keyframe_delete_v3d";
	
	/* callbacks */
	ot->invoke= WM_operator_confirm;
	ot->exec= delete_key_v3d_exec; 
	
	ot->poll= ED_operator_areaactive;
	
	/* flags */
	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}


/* Insert Key Button Operator ------------------------ */

static int insert_key_button_exec (bContext *C, wmOperator *op)
{
	Scene *scene= CTX_data_scene(C);
	PointerRNA ptr;
	PropertyRNA *prop= NULL;
	char *path;
	float cfra= (float)CFRA; // XXX for now, don't bother about all the yucky offset crap
	short success= 0;
	int a, index, length, all= RNA_boolean_get(op->ptr, "all");
	short flag = 0;
	
	/* flags for inserting keyframes */
	flag = ANIM_get_keyframing_flags(scene, 1);
	
	/* try to insert keyframe using property retrieved from UI */
	memset(&ptr, 0, sizeof(PointerRNA));
	uiAnimContextProperty(C, &ptr, &prop, &index);
	
	if ((ptr.data && prop) && RNA_property_animateable(&ptr, prop)) {
		path= RNA_path_from_ID_to_property(&ptr, prop);
		
		if (path) {
			if (all) {
				length= RNA_property_array_length(&ptr, prop);
				
				if(length) index= 0;
				else length= 1;
			}
			else
				length= 1;
			
			for (a=0; a<length; a++)
				success+= insert_keyframe(ptr.id.data, NULL, NULL, path, index+a, cfra, flag);
			
			MEM_freeN(path);
		}
		else if (ptr.type == &RNA_NlaStrip) {
			/* handle special vars for NLA-strips */
			NlaStrip *strip= (NlaStrip *)ptr.data;
			FCurve *fcu= list_find_fcurve(&strip->fcurves, RNA_property_identifier(prop), flag);
			
			success+= insert_keyframe_direct(ptr, prop, fcu, cfra, 0);
		}
		else {
			if (G.f & G_DEBUG)
				printf("Button Insert-Key: no path to property \n");
			BKE_report(op->reports, RPT_WARNING, "Failed to resolve path to property. Try using a Keying Set instead.");
		}
	}
	else if (G.f & G_DEBUG) {
		printf("ptr.data = %p, prop = %p,", ptr.data, prop);
		if(prop)
			printf("animateable = %d \n", RNA_property_animateable(&ptr, prop));
		else
			printf("animateable = NULL \n");
	}
	
	if (success) {
		/* send updates */
		DAG_ids_flush_update(0);
		
		/* send notifiers that keyframes have been changed */
		WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
	}
	
	return (success)? OPERATOR_FINISHED: OPERATOR_CANCELLED;
}

void ANIM_OT_keyframe_insert_button (wmOperatorType *ot)
{
	/* identifiers */
	ot->name= "Insert Keyframe (Buttons)";
	ot->idname= "ANIM_OT_keyframe_insert_button";
	
	/* callbacks */
	ot->exec= insert_key_button_exec; 
	ot->poll= modify_key_op_poll;
	
	/* flags */
	ot->flag= OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "all", 1, "All", "Insert a keyframe for all element of the array.");
}

/* Delete Key Button Operator ------------------------ */

static int delete_key_button_exec (bContext *C, wmOperator *op)
{
	Scene *scene= CTX_data_scene(C);
	PointerRNA ptr;
	PropertyRNA *prop= NULL;
	char *path;
	float cfra= (float)CFRA; // XXX for now, don't bother about all the yucky offset crap
	short success= 0;
	int a, index, length, all= RNA_boolean_get(op->ptr, "all");
	
	/* try to insert keyframe using property retrieved from UI */
	memset(&ptr, 0, sizeof(PointerRNA));
	uiAnimContextProperty(C, &ptr, &prop, &index);

	if (ptr.data && prop) {
		path= RNA_path_from_ID_to_property(&ptr, prop);
		
		if (path) {
			if (all) {
				length= RNA_property_array_length(&ptr, prop);
				
				if(length) index= 0;
				else length= 1;
			}
			else
				length= 1;
			
			for (a=0; a<length; a++)
				success+= delete_keyframe(ptr.id.data, NULL, NULL, path, index+a, cfra, 0);
			
			MEM_freeN(path);
		}
		else if (G.f & G_DEBUG)
			printf("Button Delete-Key: no path to property \n");
	}
	else if (G.f & G_DEBUG) {
		printf("ptr.data = %p, prop = %p \n", ptr.data, prop);
	}
	
	
	if (success) {
		/* send updates */
		DAG_ids_flush_update(0);
		
		/* send notifiers that keyframes have been changed */
		WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
	}
	
	return (success)? OPERATOR_FINISHED: OPERATOR_CANCELLED;
}

void ANIM_OT_keyframe_delete_button (wmOperatorType *ot)
{
	/* identifiers */
	ot->name= "Delete Keyframe (Buttons)";
	ot->idname= "ANIM_OT_keyframe_delete_button";
	
	/* callbacks */
	ot->exec= delete_key_button_exec; 
	ot->poll= modify_key_op_poll;
	
	/* flags */
	ot->flag= OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "all", 1, "All", "Delete keyfames from all elements of the array.");
}

/* ******************************************* */
/* AUTO KEYFRAME */

int autokeyframe_cfra_can_key(Scene *scene, ID *id)
{
	float cfra= (float)CFRA; // XXX for now, this will do
	
	/* only filter if auto-key mode requires this */
	if (IS_AUTOKEY_ON(scene) == 0)
		return 0;
		
	if (IS_AUTOKEY_MODE(scene, NORMAL)) {
		/* can insert anytime we like... */
		return 1;
	}
	else /* REPLACE */ {
		/* for whole block - only key if there's a keyframe on that frame already
		 *	this is a valid assumption when we're blocking + tweaking
		 */
		return id_frame_has_keyframe(id, cfra, ANIMFILTER_KEYS_LOCAL);
	}
}

/* ******************************************* */
/* KEYFRAME DETECTION */

/* --------------- API/Per-Datablock Handling ------------------- */

/* Checks if some F-Curve has a keyframe for a given frame */
short fcurve_frame_has_keyframe (FCurve *fcu, float frame, short filter)
{
	/* quick sanity check */
	if (ELEM(NULL, fcu, fcu->bezt))
		return 0;
	
	/* we either include all regardless of muting, or only non-muted  */
	if ((filter & ANIMFILTER_KEYS_MUTED) || (fcu->flag & FCURVE_MUTED)==0) {
		short replace = -1;
		int i = binarysearch_bezt_index(fcu->bezt, frame, fcu->totvert, &replace);
		
		/* binarysearch_bezt_index will set replace to be 0 or 1
		 * 	- obviously, 1 represents a match
		 */
		if (replace) {			
			/* sanity check: 'i' may in rare cases exceed arraylen */
			if ((i >= 0) && (i < fcu->totvert))
				return 1;
		}
	}
	
	return 0;
}

/* Checks whether an Action has a keyframe for a given frame 
 * Since we're only concerned whether a keyframe exists, we can simply loop until a match is found...
 */
short action_frame_has_keyframe (bAction *act, float frame, short filter)
{
	FCurve *fcu;
	
	/* can only find if there is data */
	if (act == NULL)
		return 0;
		
	/* if only check non-muted, check if muted */
	if ((filter & ANIMFILTER_KEYS_MUTED) || (act->flag & ACT_MUTED))
		return 0;
	
	/* loop over F-Curves, using binary-search to try to find matches 
	 *	- this assumes that keyframes are only beztriples
	 */
	for (fcu= act->curves.first; fcu; fcu= fcu->next) {
		/* only check if there are keyframes (currently only of type BezTriple) */
		if (fcu->bezt && fcu->totvert) {
			if (fcurve_frame_has_keyframe(fcu, frame, filter))
				return 1;
		}
	}
	
	/* nothing found */
	return 0;
}

/* Checks whether an Object has a keyframe for a given frame */
short object_frame_has_keyframe (Object *ob, float frame, short filter)
{
	/* error checking */
	if (ob == NULL)
		return 0;
	
	/* check own animation data - specifically, the action it contains */
	if ((ob->adt) && (ob->adt->action)) {
		if (action_frame_has_keyframe(ob->adt->action, frame, filter))
			return 1;
	}
	
	/* try shapekey keyframes (if available, and allowed by filter) */
	if ( !(filter & ANIMFILTER_KEYS_LOCAL) && !(filter & ANIMFILTER_KEYS_NOSKEY) ) {
		Key *key= ob_get_key(ob);
		
		/* shapekeys can have keyframes ('Relative Shape Keys') 
		 * or depend on time (old 'Absolute Shape Keys') 
		 */
		 
			/* 1. test for relative (with keyframes) */
		if (id_frame_has_keyframe((ID *)key, frame, filter))
			return 1;
			
			/* 2. test for time */
		// TODO... yet to be implemented (this feature may evolve before then anyway)
	}
	
	/* try materials */
	if ( !(filter & ANIMFILTER_KEYS_LOCAL) && !(filter & ANIMFILTER_KEYS_NOMAT) ) {
		/* if only active, then we can skip a lot of looping */
		if (filter & ANIMFILTER_KEYS_ACTIVE) {
			Material *ma= give_current_material(ob, (ob->actcol + 1));
			
			/* we only retrieve the active material... */
			if (id_frame_has_keyframe((ID *)ma, frame, filter))
				return 1;
		}
		else {
			int a;
			
			/* loop over materials */
			for (a=0; a<ob->totcol; a++) {
				Material *ma= give_current_material(ob, a+1);
				
				if (id_frame_has_keyframe((ID *)ma, frame, filter))
					return 1;
			}
		}
	}
	
	/* nothing found */
	return 0;
}

/* --------------- API ------------------- */

/* Checks whether a keyframe exists for the given ID-block one the given frame */
short id_frame_has_keyframe (ID *id, float frame, short filter)
{
	/* sanity checks */
	if (id == NULL)
		return 0;
	
	/* perform special checks for 'macro' types */
	switch (GS(id->name)) {
		case ID_OB: /* object */
			return object_frame_has_keyframe((Object *)id, frame, filter);
			break;
			
		case ID_SCE: /* scene */
		// XXX TODO... for now, just use 'normal' behaviour
		//	break;
		
		default: 	/* 'normal type' */
		{
			AnimData *adt= BKE_animdata_from_id(id);
			
			/* only check keyframes in active action */
			if (adt)
				return action_frame_has_keyframe(adt->action, frame, filter);
		}
			break;
	}
	
	
	/* no keyframe found */
	return 0;
}

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