forked from bartvdbraak/blender
added stdlib.h header, comments and all lines < 80 chars.
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@ -29,13 +29,18 @@
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* ***** END GPL/BL DUAL LICENSE BLOCK *****
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*/
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#include <stdlib.h>
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#include "BKE_utildefines.h"
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#include "MEM_guardedalloc.h"
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#include "BLI_boxpack2d.h"
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/* Campbells BoxPacker ported from Python */
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/* BoxPacker ported from Python by Campbell Barton
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*
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* The defined Below are for internal use only */
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/* free vert flags */
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#define EUL 0.0000001
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#define eul 0.0000001
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#define BLF 1
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#define TRF 2
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#define TLF 4
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@ -51,20 +56,35 @@
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#define BOXTOP(b) b->v[TR]->y
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#define BOXAREA(b) (b->w * b->h)
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#define UPDATE_V34X(b) b->v[TL]->x = b->v[BL]->x; b->v[BR]->x = b->v[TR]->x
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#define UPDATE_V34Y(b) b->v[TL]->y = b->v[TR]->y; b->v[BR]->y = b->v[BL]->y
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#define UPDATE_V34(b) UPDATE_V34X(b) UPDATE_V34Y(b)
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#define UPDATE_V34X(b) b->v[TL]->x = b->v[BL]->x;\
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b->v[BR]->x = b->v[TR]->x
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#define UPDATE_V34Y(b) b->v[TL]->y = b->v[TR]->y;\
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b->v[BR]->y = b->v[BL]->y
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#define UPDATE_V34(b) UPDATE_V34X(b); UPDATE_V34Y(b)
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#define SET_BOXLEFT(b, f) b->v[TR]->x = f + b->w; b->v[BL]->x = f; UPDATE_V34X(b)
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#define SET_BOXRIGHT(b, f) b->v[BL]->x = f - b->w; b->v[TR]->x = f; UPDATE_V34X(b)
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#define SET_BOXBOTTOM(b, f) b->v[TR]->y = f + b->h; b->v[BL]->y = f; UPDATE_V34Y(b)
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#define SET_BOXTOP(b, f) b->v[BL]->y = f - b->h; b->v[TR]->y = f; UPDATE_V34Y(b)
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#define BOXINTERSECT(b1, b2) (!(BOXLEFT(b1)+EUL>=BOXRIGHT(b2) || BOXBOTTOM(b1)+EUL>=BOXTOP(b2) || BOXRIGHT(b1)-EUL<=BOXLEFT(b2) || BOXTOP(b1)-EUL<=BOXBOTTOM(b2) ))
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/* #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) */
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#define SET_BOXLEFT(b, f) b->v[TR]->x = f + b->w;\
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b->v[BL]->x = f;\
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UPDATE_V34X(b)
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#define SET_BOXRIGHT(b, f) b->v[BL]->x = f - b->w;\
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b->v[TR]->x = f;\
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UPDATE_V34X(b)
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#define SET_BOXBOTTOM(b, f) b->v[TR]->y = f + b->h;\
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b->v[BL]->y = f;\
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UPDATE_V34Y(b)
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#define SET_BOXTOP(b, f) b->v[BL]->y = f - b->h;\
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b->v[TR]->y = f;\
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UPDATE_V34Y(b)
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#define BOXINTERSECT(b1, b2)\
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(!( BOXLEFT(b1)+eul>=BOXRIGHT(b2) ||\
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BOXBOTTOM(b1)+eul>=BOXTOP(b2) ||\
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BOXRIGHT(b1)-eul<=BOXLEFT(b2) ||\
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BOXTOP(b1)-eul<=BOXBOTTOM(b2) ))
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/* #define BOXDEBUG(b)\
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* printf("\tBox Debug i %i, w:%.3f h:%.3f x:%.3f y:%.3f\n",\
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* b->index, b->w, b->h, b->x, b->y) */
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/* qsort function - sort largest to smallest */
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static int box_areasort(const void *p1, const void *p2)
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{
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const boxPack *b1=p1, *b2=p2;
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@ -73,13 +93,16 @@ static int box_areasort(const void *p1, const void *p2)
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a1 = BOXAREA(b1);
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a2 = BOXAREA(b2);
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/* sort largest to smallest */
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if ( a1 < a2 ) return 1;
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else if ( a1 > a2 ) return -1;
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return 0;
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}
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/* qsort vertex sorting function
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* sorts from lower left to top right It uses the current box's width and height
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* as offsets when sorting, this has the result of not placing boxes outside
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* the bounds of the existing backed area where possible
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* */
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static float box_width;
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static float box_height;
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static boxVert *vertarray;
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@ -100,14 +123,26 @@ static int vertex_sort(const void *p1, const void *p2)
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else if ( a1 < a2 ) return -1;
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return 0;
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}
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/* Main boxpacking function accessed from other functions
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* This sets boxes x,y to positive values, sorting from 0,0 outwards.
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* There is no limit to the space boxes may take, only that they will be packed
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* tightly into the lower left hand corner (0,0)
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*
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* boxarray - a pre allocated array of boxes.
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* only the 'box->x' and 'box->y' are set, 'box->w' and 'box->h' are used,
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* 'box->index' is not used at all, the only reason its there
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* is that the box array is sorted by area and programs need to be able
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* to have some way of writing the boxes back to the original data.
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* len - the number of boxes in teh array.
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* tot_width and tot_height are set so you can normalize the data.
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* */
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void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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{
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boxVert *vert;
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int box_index, verts_pack_len, i, j, k, isect; /* what box are we up to packing */
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boxVert *vert; /* the current vert */
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int box_index, verts_pack_len, i, j, k, isect;
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int quad_flags[4]= {BLF,TRF,TLF,BRF}; /* use for looping */
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boxPack *box, *box_test;
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int *vertex_pack_indicies;
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boxPack *box, *box_test; /*current box and another for intersection tests*/
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int *vertex_pack_indicies; /*an array of indicies used for sorting verts*/
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if (!len) {
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*tot_width = 0.0;
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@ -121,8 +156,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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/* add verts to the boxes, these are only used internally */
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vert = vertarray = MEM_mallocN( len*4*sizeof(boxVert), "boxPack verts");
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vertex_pack_indicies = MEM_mallocN( len*3*sizeof(int), "boxPack indicies");
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i=0;
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for (box= boxarray, box_index= 0; box_index < len; box_index++, box++) {
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for (box=boxarray, box_index=0, i=0; box_index < len; box_index++, box++) {
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vert->blb = vert->brb = vert->tlb =\
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vert->isect_cache[0] = vert->isect_cache[1] =\
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@ -197,7 +232,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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for (i=0; i<verts_pack_len && isect; i++) {
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vert = vertarray + vertex_pack_indicies[i];
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/* printf("\ttesting vert %i %i %i %f %f\n", i, vert->free, verts_pack_len, vert->x, vert->y); */
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/* printf("\ttesting vert %i %i %i %f %f\n", i,
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* vert->free, verts_pack_len, vert->x, vert->y); */
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/* This vert has a free quaderent
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* Test if we can place the box here
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@ -231,9 +267,10 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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isect = 0;
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if (/* Constrain boxes to positive X/Y values */
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BOXLEFT(box)<0.0 || BOXBOTTOM(box)<0.0 ||
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BOXLEFT(box)<0.0 || BOXBOTTOM(box) < 0.0 ||
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/* check for last intersected */
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(vert->isect_cache[j] && BOXINTERSECT(box, vert->isect_cache[j]))
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( vert->isect_cache[j] &&
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BOXINTERSECT(box, vert->isect_cache[j]) )
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) {
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/* Here we check that the last intersected
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* box will intersect with this one using
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@ -245,10 +282,10 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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/* do a full saech for colliding box
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* this is realy slow, some spacialy divided
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* datastructure would be better */
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for (box_test = boxarray; box_test != box; box_test++) {
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for (box_test=boxarray; box_test != box; box_test++) {
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if BOXINTERSECT(box, box_test) {
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/* Store the last intersecting here
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* as cache for faster checking next time around */
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/* Store the last intersecting here as cache
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* for faster checking next time around */
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vert->isect_cache[j] = box_test;
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isect = 1;
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break;
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@ -284,8 +321,9 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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break;
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}
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/* Mask free flags for verts that are on the bottom or side
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* so we dont get boxes outside the given rectangle ares
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/* Mask free flags for verts that are
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* on the bottom or side so we dont get
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* boxes outside the given rectangle ares
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*
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* We can do an else/if here because only the first
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* box can be at the very bottom left corner */
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@ -302,7 +340,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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* flag verts on one or both of the boxes
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* as being used by checking the width or
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* height of both boxes */
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if (vert->tlb && vert->trb && (box == vert->tlb || box == vert->trb)) {
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if (vert->tlb && vert->trb &&
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(box == vert->tlb || box == vert->trb)) {
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if (vert->tlb->h > vert->trb->h) {
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vert->trb->v[TL]->free &= ~(TLF|BLF);
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} else if (vert->tlb->h < vert->trb->h) {
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@ -311,7 +350,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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vert->tlb->v[TR]->free &= ~BLF;
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vert->trb->v[TL]->free &= ~BRF;
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}
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} else if (vert->blb && vert->brb && (box == vert->blb || box == vert->brb)) {
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} else if (vert->blb && vert->brb &&
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(box == vert->blb || box == vert->brb)) {
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if (vert->blb->h > vert->brb->h) {
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vert->brb->v[BL]->free &= ~(TLF|BLF);
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} else if (vert->blb->h < vert->brb->h) {
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@ -322,7 +362,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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}
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}
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/* Horizontal */
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if (vert->tlb && vert->blb && (box == vert->tlb || box == vert->blb)) {
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if (vert->tlb && vert->blb &&
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(box == vert->tlb || box == vert->blb) ) {
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if (vert->tlb->w > vert->blb->w) {
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vert->blb->v[TL]->free &= ~(TLF|TRF);
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} else if (vert->tlb->w < vert->blb->w) {
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@ -331,7 +372,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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vert->blb->v[TL]->free &= ~TRF;
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vert->tlb->v[BL]->free &= ~BRF;
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}
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} else if (vert->trb && vert->brb && (box == vert->trb || box == vert->brb)) {
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} else if ( vert->trb && vert->brb &&
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(box == vert->trb || box == vert->brb) ) {
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if (vert->trb->w > vert->brb->w) {
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vert->brb->v[TR]->free &= ~(TRF|TRF);
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} else if (vert->trb->w < vert->brb->w) {
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@ -346,7 +388,8 @@ void boxPack2D(boxPack *boxarray, int len, float *tot_width, float *tot_height)
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for (k=0; k<4; k++) {
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if (box->v[k] != vert) {
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vertex_pack_indicies[verts_pack_len] = box->v[k]->index;
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vertex_pack_indicies[verts_pack_len] =
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box->v[k]->index;
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verts_pack_len++;
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}
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}
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