Leaked source code of windows server 2003
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/**************************************************************************
* *
* Copyright (C) 1992, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
/*
* varray.c++ - $Revision: 1.6 $
* Derrick Burns - 1991
*/
#include "glimport.h"
#include "myassert.h"
#include "mystdio.h"
#include "varray.h"
#include "arc.h"
#include "math.h" // fabs()
#define TINY 0.0001
inline long sgn( REAL x )
{
return (x < -TINY) ? -1 : ((x > TINY) ? 1 : 0 );
}
Varray::Varray( void )
{
varray = 0;
size = 0;
}
Varray::~Varray( void )
{
if( varray ) delete[] varray;
}
inline void
Varray::update( Arc_ptr arc, long dir[2], REAL val )
{
register long ds = sgn(arc->tail()[0] - arc->prev->tail()[0]);
register long dt = sgn(arc->tail()[1] - arc->prev->tail()[1]);
if( dir[0] != ds || dir[1] != dt ) {
dir[0] = ds;
dir[1] = dt;
append( val );
}
}
void
Varray::grow( long guess )
{
if( size < guess ) {
size = guess * 2;
if( varray ) delete[] varray;
varray = new REAL[size];
assert( varray != 0 );
}
}
long
Varray::init( REAL delta, Arc_ptr toparc, Arc_ptr botarc )
{
Arc_ptr left = toparc->next;
Arc_ptr right = toparc;
long ldir[2], rdir[2];
ldir[0] = sgn( left->tail()[0] - left->prev->tail()[0] );
ldir[1] = sgn( left->tail()[1] - left->prev->tail()[1] );
rdir[0] = sgn( right->tail()[0] - right->prev->tail()[0] );
rdir[1] = sgn( right->tail()[1] - right->prev->tail()[1] );
vval[0] = toparc->tail()[1];
numquads = 0;
while( 1 ) {
switch( sgn( left->tail()[1] - right->prev->tail()[1] ) ) {
case 1:
left = left->next;
update( left, ldir, left->prev->tail()[1] );
break;
case -1:
right = right->prev;
update( right, rdir, right->tail()[1] );
break;
case 0:
if( fabs(left->tail()[1] - botarc->tail()[1]) < TINY) goto end;
if( fabs(left->tail()[0]-right->prev->tail()[0]) < TINY &&
fabs(left->tail()[1]-right->prev->tail()[1]) < TINY) goto end;
left = left->next;
break;
}
}
end:
append( botarc->tail()[1] );
grow( ((long) ((vval[0] - vval[numquads])/delta)) + numquads + 2 );
long index = 0;
for( long i=0; i<numquads; i++ ) {
voffset[i] = index;
varray[index++] = vval[i];
REAL dist = vval[i] - vval[i+1];
if( dist > delta ) {
long steps = ((long) (dist/delta)) +1;
float deltav = - dist / (REAL) steps;
for( long j=1; j<steps; j++ )
varray[index++] = vval[i] + j * deltav;
}
}
voffset[i] = index;
varray[index] = vval[i];
return index;
}