413 lines
12 KiB
C
413 lines
12 KiB
C
/*
|
|
*
|
|
* ***** 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Contributor(s): Campbell Barton
|
|
*
|
|
* ***** END GPL LICENSE BLOCK *****
|
|
*/
|
|
|
|
#include <stdlib.h> /* for qsort */
|
|
|
|
#include "MEM_guardedalloc.h"
|
|
#include "BLI_boxpack2d.h"
|
|
|
|
/* BoxPacker for backing 2D rectangles into a square
|
|
*
|
|
* The defined Below are for internal use only */
|
|
|
|
/* free vert flags */
|
|
#define eul 0.0000001f
|
|
#define BLF 1
|
|
#define TRF 2
|
|
#define TLF 4
|
|
#define BRF 8
|
|
#define CORNERFLAGS (BLF|TRF|TLF|BRF)
|
|
|
|
#define BL 0
|
|
#define TR 1
|
|
#define TL 2
|
|
#define BR 3
|
|
|
|
#define BOXLEFT(b) b->v[BL]->x
|
|
#define BOXRIGHT(b) b->v[TR]->x
|
|
#define BOXBOTTOM(b) b->v[BL]->y
|
|
#define BOXTOP(b) b->v[TR]->y
|
|
#define BOXAREA(b) (b->w * b->h)
|
|
|
|
#define UPDATE_V34X(b) b->v[TL]->x = b->v[BL]->x;\
|
|
b->v[BR]->x = b->v[TR]->x
|
|
#define UPDATE_V34Y(b) b->v[TL]->y = b->v[TR]->y;\
|
|
b->v[BR]->y = b->v[BL]->y
|
|
#define UPDATE_V34(b) UPDATE_V34X(b); UPDATE_V34Y(b)
|
|
|
|
#define SET_BOXLEFT(b, f) b->v[TR]->x = f + b->w;\
|
|
b->v[BL]->x = f;\
|
|
UPDATE_V34X(b)
|
|
#define SET_BOXRIGHT(b, f) b->v[BL]->x = f - b->w;\
|
|
b->v[TR]->x = f;\
|
|
UPDATE_V34X(b)
|
|
#define SET_BOXBOTTOM(b, f) b->v[TR]->y = f + b->h;\
|
|
b->v[BL]->y = f;\
|
|
UPDATE_V34Y(b)
|
|
#define SET_BOXTOP(b, f) b->v[BL]->y = f - b->h;\
|
|
b->v[TR]->y = f;\
|
|
UPDATE_V34Y(b)
|
|
#define BOXINTERSECT(b1, b2)\
|
|
(!( BOXLEFT(b1)+eul>=BOXRIGHT(b2) ||\
|
|
BOXBOTTOM(b1)+eul>=BOXTOP(b2) ||\
|
|
BOXRIGHT(b1)-eul<=BOXLEFT(b2) ||\
|
|
BOXTOP(b1)-eul<=BOXBOTTOM(b2) ))
|
|
|
|
#define MIN2(x,y) ( (x)<(y) ? (x) : (y) )
|
|
#define MAX2(x,y) ( (x)>(y) ? (x) : (y) )
|
|
|
|
/* #define BOXDEBUG(b)\
|
|
* printf("\tBox Debug i %i, w:%.3f h:%.3f x:%.3f y:%.3f\n",\
|
|
* b->index, b->w, b->h, b->x, b->y) */
|
|
|
|
/* qsort function - sort largest to smallest */
|
|
static int box_areasort(const void *p1, const void *p2)
|
|
{
|
|
const boxPack *b1=p1, *b2=p2;
|
|
float a1, a2;
|
|
|
|
a1 = BOXAREA(b1);
|
|
a2 = BOXAREA(b2);
|
|
|
|
if ( a1 < a2 ) return 1;
|
|
else if ( a1 > a2 ) return -1;
|
|
return 0;
|
|
}
|
|
|
|
/* qsort vertex sorting function
|
|
* sorts from lower left to top right It uses the current box's width and height
|
|
* as offsets when sorting, this has the result of not placing boxes outside
|
|
* the bounds of the existing backed area where possible
|
|
* */
|
|
static float box_width;
|
|
static float box_height;
|
|
static boxVert *vertarray;
|
|
|
|
static int vertex_sort(const void *p1, const void *p2)
|
|
{
|
|
boxVert *v1, *v2;
|
|
float a1, a2;
|
|
|
|
v1 = vertarray + ((int *) p1)[0];
|
|
v2 = vertarray + ((int *) p2)[0];
|
|
|
|
a1 = MAX2(v1->x+box_width, v1->y+box_height);
|
|
a2 = MAX2(v2->x+box_width, v2->y+box_height);
|
|
|
|
/* sort largest to smallest */
|
|
if ( a1 > a2 ) return 1;
|
|
else if ( a1 < a2 ) return -1;
|
|
return 0;
|
|
}
|
|
/* Main boxpacking function accessed from other functions
|
|
* This sets boxes x,y to positive values, sorting from 0,0 outwards.
|
|
* There is no limit to the space boxes may take, only that they will be packed
|
|
* tightly into the lower left hand corner (0,0)
|
|
*
|
|
* boxarray - a pre allocated array of boxes.
|
|
* only the 'box->x' and 'box->y' are set, 'box->w' and 'box->h' are used,
|
|
* 'box->index' is not used at all, the only reason its there
|
|
* is that the box array is sorted by area and programs need to be able
|
|
* to have some way of writing the boxes back to the original data.
|
|
* len - the number of boxes in the array.
|
|
* tot_width and tot_height are set so you can normalize the data.
|
|
* */
|
|
void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
|
|
{
|
|
boxVert *vert; /* the current vert */
|
|
int box_index, verts_pack_len, i, j, k, isect;
|
|
int quad_flags[4]= {BLF,TRF,TLF,BRF}; /* use for looping */
|
|
boxPack *box, *box_test; /*current box and another for intersection tests*/
|
|
int *vertex_pack_indicies; /*an array of indices used for sorting verts*/
|
|
|
|
if (!len) {
|
|
*tot_width = 0.0f;
|
|
*tot_height = 0.0f;
|
|
return;
|
|
}
|
|
|
|
/* Sort boxes, biggest first */
|
|
qsort(boxarray, len, sizeof(boxPack), box_areasort);
|
|
|
|
/* add verts to the boxes, these are only used internally */
|
|
vert = vertarray = MEM_mallocN( len*4*sizeof(boxVert), "boxPack Verts");
|
|
vertex_pack_indicies = MEM_mallocN( len*3*sizeof(int), "boxPack Indices");
|
|
|
|
for (box=boxarray, box_index=0, i=0; box_index < len; box_index++, box++) {
|
|
|
|
vert->blb = vert->brb = vert->tlb =\
|
|
vert->isect_cache[0] = vert->isect_cache[1] =\
|
|
vert->isect_cache[2] = vert->isect_cache[3] = NULL;
|
|
vert->free = CORNERFLAGS &~ TRF;
|
|
vert->trb = box;
|
|
vert->index = i; i++;
|
|
box->v[BL] = vert; vert++;
|
|
|
|
vert->trb= vert->brb = vert->tlb =\
|
|
vert->isect_cache[0] = vert->isect_cache[1] =\
|
|
vert->isect_cache[2] = vert->isect_cache[3] = NULL;
|
|
vert->free = CORNERFLAGS &~ BLF;
|
|
vert->blb = box;
|
|
vert->index = i; i++;
|
|
box->v[TR] = vert; vert++;
|
|
|
|
vert->trb = vert->blb = vert->tlb =\
|
|
vert->isect_cache[0] = vert->isect_cache[1] =\
|
|
vert->isect_cache[2] = vert->isect_cache[3] = NULL;
|
|
vert->free = CORNERFLAGS &~ BRF;
|
|
vert->brb = box;
|
|
vert->index = i; i++;
|
|
box->v[TL] = vert; vert++;
|
|
|
|
vert->trb = vert->blb = vert->brb =\
|
|
vert->isect_cache[0] = vert->isect_cache[1] =\
|
|
vert->isect_cache[2] = vert->isect_cache[3] = NULL;
|
|
vert->free = CORNERFLAGS &~ TLF;
|
|
vert->tlb = box;
|
|
vert->index = i; i++;
|
|
box->v[BR] = vert; vert++;
|
|
}
|
|
vert = NULL;
|
|
|
|
|
|
/* Pack the First box!
|
|
* then enter the main box-packing loop */
|
|
|
|
box = boxarray; /* get the first box */
|
|
/* First time, no boxes packed */
|
|
box->v[BL]->free = 0; /* Can't use any if these */
|
|
box->v[BR]->free &= ~(BLF|BRF);
|
|
box->v[TL]->free &= ~(BLF|TLF);
|
|
|
|
*tot_width = box->w;
|
|
*tot_height = box->h;
|
|
|
|
/* This sets all the vertex locations */
|
|
SET_BOXLEFT(box, 0.0f);
|
|
SET_BOXBOTTOM(box, 0.0f);
|
|
box->x = box->y = 0.0f;
|
|
|
|
for (i=0; i<3; i++)
|
|
vertex_pack_indicies[i] = box->v[i+1]->index;
|
|
verts_pack_len = 3;
|
|
box++; /* next box, needed for the loop below */
|
|
/* ...done packing the first box */
|
|
|
|
/* Main boxpacking loop */
|
|
for (box_index=1; box_index < len; box_index++, box++) {
|
|
|
|
/* These static floatds are used for sorting */
|
|
box_width = box->w;
|
|
box_height = box->h;
|
|
|
|
qsort(vertex_pack_indicies, verts_pack_len, sizeof(int), vertex_sort);
|
|
|
|
/* Pack the box in with the others */
|
|
/* sort the verts */
|
|
isect = 1;
|
|
|
|
for (i=0; i<verts_pack_len && isect; i++) {
|
|
vert = vertarray + vertex_pack_indicies[i];
|
|
/* printf("\ttesting vert %i %i %i %f %f\n", i,
|
|
* vert->free, verts_pack_len, vert->x, vert->y); */
|
|
|
|
/* This vert has a free quadrant
|
|
* Test if we can place the box here
|
|
* vert->free & quad_flags[j] - Checks
|
|
* */
|
|
|
|
for (j=0; (j<4) && isect; j++) {
|
|
if (vert->free & quad_flags[j]) {
|
|
switch (j) {
|
|
case BL:
|
|
SET_BOXRIGHT(box, vert->x);
|
|
SET_BOXTOP(box, vert->y);
|
|
break;
|
|
case TR:
|
|
SET_BOXLEFT(box, vert->x);
|
|
SET_BOXBOTTOM(box, vert->y);
|
|
break;
|
|
case TL:
|
|
SET_BOXRIGHT(box, vert->x);
|
|
SET_BOXBOTTOM(box, vert->y);
|
|
break;
|
|
case BR:
|
|
SET_BOXLEFT(box, vert->x);
|
|
SET_BOXTOP(box, vert->y);
|
|
break;
|
|
}
|
|
|
|
/* Now we need to check that the box intersects
|
|
* with any other boxes
|
|
* Assume no intersection... */
|
|
isect = 0;
|
|
|
|
if (/* Constrain boxes to positive X/Y values */
|
|
BOXLEFT(box)<0.0f || BOXBOTTOM(box) < 0.0f ||
|
|
/* check for last intersected */
|
|
( vert->isect_cache[j] &&
|
|
BOXINTERSECT(box, vert->isect_cache[j]) )
|
|
) {
|
|
/* Here we check that the last intersected
|
|
* box will intersect with this one using
|
|
* isect_cache that can store a pointer to a
|
|
* box for each quadrant
|
|
* big speedup */
|
|
isect = 1;
|
|
} else {
|
|
/* do a full search for colliding box
|
|
* this is really slow, some spacialy divided
|
|
* data-structure would be better */
|
|
for (box_test=boxarray; box_test != box; box_test++) {
|
|
if BOXINTERSECT(box, box_test) {
|
|
/* Store the last intersecting here as cache
|
|
* for faster checking next time around */
|
|
vert->isect_cache[j] = box_test;
|
|
isect = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!isect) {
|
|
|
|
/* maintain the total width and height */
|
|
(*tot_width) = MAX2(BOXRIGHT(box), (*tot_width));
|
|
(*tot_height) = MAX2(BOXTOP(box), (*tot_height));
|
|
|
|
/* Place the box */
|
|
vert->free &= ~quad_flags[j];
|
|
|
|
switch (j) {
|
|
case TR:
|
|
box->v[BL]= vert;
|
|
vert->trb = box;
|
|
break;
|
|
case TL:
|
|
box->v[BR]= vert;
|
|
vert->tlb = box;
|
|
break;
|
|
case BR:
|
|
box->v[TL]= vert;
|
|
vert->brb = box;
|
|
break;
|
|
case BL:
|
|
box->v[TR]= vert;
|
|
vert->blb = box;
|
|
break;
|
|
}
|
|
|
|
/* Mask free flags for verts that are
|
|
* on the bottom or side so we don't get
|
|
* boxes outside the given rectangle ares
|
|
*
|
|
* We can do an else/if here because only the first
|
|
* box can be at the very bottom left corner */
|
|
if (BOXLEFT(box) <= 0) {
|
|
box->v[TL]->free &= ~(TLF|BLF);
|
|
box->v[BL]->free &= ~(TLF|BLF);
|
|
} else if (BOXBOTTOM(box) <= 0) {
|
|
box->v[BL]->free &= ~(BRF|BLF);
|
|
box->v[BR]->free &= ~(BRF|BLF);
|
|
}
|
|
|
|
/* The following block of code does a logical
|
|
* check with 2 adjacent boxes, its possible to
|
|
* flag verts on one or both of the boxes
|
|
* as being used by checking the width or
|
|
* height of both boxes */
|
|
if (vert->tlb && vert->trb &&
|
|
(box == vert->tlb || box == vert->trb)) {
|
|
if (vert->tlb->h > vert->trb->h) {
|
|
vert->trb->v[TL]->free &= ~(TLF|BLF);
|
|
} else if (vert->tlb->h < vert->trb->h) {
|
|
vert->tlb->v[TR]->free &= ~(TRF|BRF);
|
|
} else { /*same*/
|
|
vert->tlb->v[TR]->free &= ~BLF;
|
|
vert->trb->v[TL]->free &= ~BRF;
|
|
}
|
|
} else if (vert->blb && vert->brb &&
|
|
(box == vert->blb || box == vert->brb)) {
|
|
if (vert->blb->h > vert->brb->h) {
|
|
vert->brb->v[BL]->free &= ~(TLF|BLF);
|
|
} else if (vert->blb->h < vert->brb->h) {
|
|
vert->blb->v[BR]->free &= ~(TRF|BRF);
|
|
} else { /*same*/
|
|
vert->blb->v[BR]->free &= ~TRF;
|
|
vert->brb->v[BL]->free &= ~TLF;
|
|
}
|
|
}
|
|
/* Horizontal */
|
|
if (vert->tlb && vert->blb &&
|
|
(box == vert->tlb || box == vert->blb) ) {
|
|
if (vert->tlb->w > vert->blb->w) {
|
|
vert->blb->v[TL]->free &= ~(TLF|TRF);
|
|
} else if (vert->tlb->w < vert->blb->w) {
|
|
vert->tlb->v[BL]->free &= ~(BLF|BRF);
|
|
} else { /*same*/
|
|
vert->blb->v[TL]->free &= ~TRF;
|
|
vert->tlb->v[BL]->free &= ~BRF;
|
|
}
|
|
} else if ( vert->trb && vert->brb &&
|
|
(box == vert->trb || box == vert->brb) ) {
|
|
if (vert->trb->w > vert->brb->w) {
|
|
vert->brb->v[TR]->free &= ~(TRF|TRF);
|
|
} else if (vert->trb->w < vert->brb->w) {
|
|
vert->trb->v[BR]->free &= ~(BLF|BRF);
|
|
} else { /*same*/
|
|
vert->brb->v[TR]->free &= ~TLF;
|
|
vert->trb->v[BR]->free &= ~BLF;
|
|
}
|
|
}
|
|
/* End logical check */
|
|
|
|
|
|
for (k=0; k<4; k++) {
|
|
if (box->v[k] != vert) {
|
|
vertex_pack_indicies[verts_pack_len] =
|
|
box->v[k]->index;
|
|
verts_pack_len++;
|
|
}
|
|
}
|
|
/* The Box verts are only used internally
|
|
* Update the box x and y since thats what external
|
|
* functions will see */
|
|
box->x = BOXLEFT(box);
|
|
box->y = BOXBOTTOM(box);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* free all the verts, not really needed because they shouldn't be
|
|
* touched anymore but accessing the pointers would crash blender */
|
|
for (box_index=0; box_index < len; box_index++) {
|
|
box = boxarray+box_index;
|
|
box->v[0] = box->v[1] = box->v[2] = box->v[3] = NULL;
|
|
}
|
|
MEM_freeN(vertex_pack_indicies);
|
|
MEM_freeN(vertarray);
|
|
}
|
|
|