screen.c

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/* 
 * $Id: screen.c 36791 2011-05-20 08:52:52Z jesterking $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "BLI_winstuff.h"

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

#include "MEM_guardedalloc.h"

#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_view3d_types.h"

#include "BLI_blenlib.h"

#include "BKE_screen.h"

/* ************ Spacetype/regiontype handling ************** */

/* keep global; this has to be accessible outside of windowmanager */
static ListBase spacetypes= {NULL, NULL};

/* not SpaceType itself */
static void spacetype_free(SpaceType *st)
{
        ARegionType *art;
        PanelType *pt;
        HeaderType *ht;
        
        for(art= st->regiontypes.first; art; art= art->next) {
                BLI_freelistN(&art->drawcalls);

                for(pt= art->paneltypes.first; pt; pt= pt->next)
                        if(pt->ext.free)
                                pt->ext.free(pt->ext.data);

                for(ht= art->headertypes.first; ht; ht= ht->next)
                        if(ht->ext.free)
                                ht->ext.free(ht->ext.data);

                BLI_freelistN(&art->paneltypes);
                BLI_freelistN(&art->headertypes);
        }
        
        BLI_freelistN(&st->regiontypes);
        BLI_freelistN(&st->toolshelf);

}

void BKE_spacetypes_free(void)
{
        SpaceType *st;
        
        for(st= spacetypes.first; st; st= st->next) {
                spacetype_free(st);
        }
        
        BLI_freelistN(&spacetypes);
}

SpaceType *BKE_spacetype_from_id(int spaceid)
{
        SpaceType *st;
        
        for(st= spacetypes.first; st; st= st->next) {
                if(st->spaceid==spaceid)
                        return st;
        }
        return NULL;
}

ARegionType *BKE_regiontype_from_id(SpaceType *st, int regionid)
{
        ARegionType *art;
        
        for(art= st->regiontypes.first; art; art= art->next)
                if(art->regionid==regionid)
                        return art;
        
        printf("Error, region type missing in - name:\"%s\", id:%d\n", st->name, st->spaceid);
        return st->regiontypes.first;
}


const ListBase *BKE_spacetypes_list(void)
{
        return &spacetypes;
}

void BKE_spacetype_register(SpaceType *st)
{
        SpaceType *stype;
        
        /* sanity check */
        stype= BKE_spacetype_from_id(st->spaceid);
        if(stype) {
                printf("error: redefinition of spacetype %s\n", stype->name);
                spacetype_free(stype);
                MEM_freeN(stype);
        }
        
        BLI_addtail(&spacetypes, st);
}

/* ***************** Space handling ********************** */

void BKE_spacedata_freelist(ListBase *lb)
{
        SpaceLink *sl;
        ARegion *ar;
        
        for (sl= lb->first; sl; sl= sl->next) {
                SpaceType *st= BKE_spacetype_from_id(sl->spacetype);
                
                /* free regions for pushed spaces */
                for(ar=sl->regionbase.first; ar; ar=ar->next)
                        BKE_area_region_free(st, ar);

                BLI_freelistN(&sl->regionbase);
                
                if(st && st->free) 
                        st->free(sl);
        }
        
        BLI_freelistN(lb);
}

ARegion *BKE_area_region_copy(SpaceType *st, ARegion *ar)
{
        ARegion *newar= MEM_dupallocN(ar);
        Panel *pa, *newpa, *patab;
        
        newar->prev= newar->next= NULL;
        newar->handlers.first= newar->handlers.last= NULL;
        newar->uiblocks.first= newar->uiblocks.last= NULL;
        newar->swinid= 0;
        
        /* use optional regiondata callback */
        if(ar->regiondata) {
                ARegionType *art= BKE_regiontype_from_id(st, ar->regiontype);

                if(art && art->duplicate)
                        newar->regiondata= art->duplicate(ar->regiondata);
                else
                        newar->regiondata= MEM_dupallocN(ar->regiondata);
        }

        if(ar->v2d.tab_offset)
                newar->v2d.tab_offset= MEM_dupallocN(ar->v2d.tab_offset);
        
        newar->panels.first= newar->panels.last= NULL;
        BLI_duplicatelist(&newar->panels, &ar->panels);
        
        /* copy panel pointers */
        for(newpa= newar->panels.first; newpa; newpa= newpa->next) {
                patab= newar->panels.first;
                pa= ar->panels.first;
                while(patab) {
                        if(newpa->paneltab == pa) {
                                newpa->paneltab = patab;
                                break;
                        }
                        patab= patab->next;
                        pa= pa->next;
                }
        }
        
        return newar;
}


/* from lb2 to lb1, lb1 is supposed to be free'd */
static void region_copylist(SpaceType *st, ListBase *lb1, ListBase *lb2)
{
        ARegion *ar;
        
        /* to be sure */
        lb1->first= lb1->last= NULL;
        
        for(ar= lb2->first; ar; ar= ar->next) {
                ARegion *arnew= BKE_area_region_copy(st, ar);
                BLI_addtail(lb1, arnew);
        }
}


/* lb1 should be empty */
void BKE_spacedata_copylist(ListBase *lb1, ListBase *lb2)
{
        SpaceLink *sl;
        
        lb1->first= lb1->last= NULL;    /* to be sure */
        
        for (sl= lb2->first; sl; sl= sl->next) {
                SpaceType *st= BKE_spacetype_from_id(sl->spacetype);
                
                if(st && st->duplicate) {
                        SpaceLink *slnew= st->duplicate(sl);
                        
                        BLI_addtail(lb1, slnew);
                        
                        region_copylist(st, &slnew->regionbase, &sl->regionbase);
                }
        }
}

/* facility to set locks for drawing to survive (render) threads accessing drawing data */
/* lock can become bitflag too */
/* should be replaced in future by better local data handling for threads */
void BKE_spacedata_draw_locks(int set)
{
        SpaceType *st;
        
        for(st= spacetypes.first; st; st= st->next) {
                ARegionType *art;
        
                for(art= st->regiontypes.first; art; art= art->next) {
                        if(set) 
                                art->do_lock= art->lock;
                        else 
                                art->do_lock= 0;
                }
        }
}


/* not region itself */
void BKE_area_region_free(SpaceType *st, ARegion *ar)
{
        if(st) {
                ARegionType *art= BKE_regiontype_from_id(st, ar->regiontype);
                
                if(art && art->free)
                        art->free(ar);
                
                if(ar->regiondata)
                        printf("regiondata free error\n");
        }
        else if(ar->type && ar->type->free)
                ar->type->free(ar);
        
        if(ar->v2d.tab_offset) {
                MEM_freeN(ar->v2d.tab_offset);
                ar->v2d.tab_offset= NULL;
        }

        if(ar)
                BLI_freelistN(&ar->panels);
}

/* not area itself */
void BKE_screen_area_free(ScrArea *sa)
{
        SpaceType *st= BKE_spacetype_from_id(sa->spacetype);
        ARegion *ar;
        
        for(ar=sa->regionbase.first; ar; ar=ar->next)
                BKE_area_region_free(st, ar);

        BLI_freelistN(&sa->regionbase);
        
        BKE_spacedata_freelist(&sa->spacedata);
        
        BLI_freelistN(&sa->actionzones);
}

/* don't free screen itself */
void free_screen(bScreen *sc)
{
        ScrArea *sa, *san;
        ARegion *ar;
        
        for(ar=sc->regionbase.first; ar; ar=ar->next)
                BKE_area_region_free(NULL, ar);

        BLI_freelistN(&sc->regionbase);
        
        for(sa= sc->areabase.first; sa; sa= san) {
                san= sa->next;
                BKE_screen_area_free(sa);
        }
        
        BLI_freelistN(&sc->vertbase);
        BLI_freelistN(&sc->edgebase);
        BLI_freelistN(&sc->areabase);
}

/* for depsgraph */
unsigned int BKE_screen_visible_layers(bScreen *screen, Scene *scene)
{
        ScrArea *sa;
        unsigned int layer= 0;

        if(screen) {
                /* get all used view3d layers */
                for(sa= screen->areabase.first; sa; sa= sa->next)
                        if(sa->spacetype==SPACE_VIEW3D)
                                layer |= ((View3D *)sa->spacedata.first)->lay;
        }

        if(!layer)
                return scene->lay;

        return layer;
}

/* ***************** Utilities ********************** */

/* Find a region of the specified type from the given area */
ARegion *BKE_area_find_region_type(ScrArea *sa, int type)
{
        if (sa) {
                ARegion *ar;
                
                for (ar=sa->regionbase.first; ar; ar= ar->next) {
                        if (ar->regiontype == type)
                                return ar;
                }
        }
        return NULL;
}

void BKE_screen_view3d_sync(struct View3D *v3d, struct Scene *scene)
{
        int bit;

        if(v3d->scenelock && v3d->localvd==NULL) {
                v3d->lay= scene->lay;
                v3d->camera= scene->camera;

                if(v3d->camera==NULL) {
                        ARegion *ar;

                        for(ar=v3d->regionbase.first; ar; ar= ar->next) {
                                if(ar->regiontype == RGN_TYPE_WINDOW) {
                                        RegionView3D *rv3d= ar->regiondata;
                                        if(rv3d->persp==RV3D_CAMOB)
                                                rv3d->persp= RV3D_PERSP;
                                }
                        }
                }

                if((v3d->lay & v3d->layact) == 0) {
                        for(bit= 0; bit<32; bit++) {
                                if(v3d->lay & (1<<bit)) {
                                        v3d->layact= 1<<bit;
                                        break;
                                }
                        }
                }
        }
}

void BKE_screen_view3d_scene_sync(bScreen *sc)
{
        /* are there cameras in the views that are not in the scene? */
        ScrArea *sa;
        for(sa= sc->areabase.first; sa; sa= sa->next) {
                SpaceLink *sl;
                for(sl= sa->spacedata.first; sl; sl= sl->next) {
                        if(sl->spacetype==SPACE_VIEW3D) {
                                View3D *v3d= (View3D*) sl;
                                BKE_screen_view3d_sync(v3d, sc->scene);
                        }
                }
        }
}

void BKE_screen_view3d_main_sync(ListBase *screen_lb, Scene *scene)
{
        bScreen *sc;
        ScrArea *sa;
        SpaceLink *sl;

        /* from scene copy to the other views */
        for(sc=screen_lb->first; sc; sc=sc->id.next) {
                if(sc->scene!=scene)
                        continue;

                for(sa=sc->areabase.first; sa; sa=sa->next)
                        for(sl=sa->spacedata.first; sl; sl=sl->next)
                                if(sl->spacetype==SPACE_VIEW3D)
                                        BKE_screen_view3d_sync((View3D*)sl, scene);
        }
}

/* magic zoom calculation, no idea what
 * it signifies, if you find out, tell me! -zr
 */

/* simple, its magic dude!
 * well, to be honest, this gives a natural feeling zooming
 * with multiple keypad presses (ton)
 */
float BKE_screen_view3d_zoom_to_fac(float camzoom)
{
        return powf(((float)M_SQRT2 + camzoom/50.0f), 2.0f) / 4.0f;
}

float BKE_screen_view3d_zoom_from_fac(float zoomfac)
{
        return ((sqrtf(4.0f * zoomfac) - (float)M_SQRT2) * 50.0f);
}