/*@z52.c:Texture Service:TextureChange, TextureCommand@***********************/
/* */
/* THE LOUT DOCUMENT FORMATTING SYSTEM (VERSION 3.28) */
/* COPYRIGHT (C) 1991, 2002 Jeffrey H. Kingston */
/* */
/* Jeffrey H. Kingston (jeff@it.usyd.edu.au) */
/* Basser Department of Computer Science */
/* The University of Sydney 2006 */
/* AUSTRALIA */
/* */
/* 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, 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 */
/* */
/* FILE: z52.c */
/* MODULE: Texture Service */
/* EXTERNS: TextureChange(), TextureCommand() */
/* */
/*****************************************************************************/
#include "externs.h"
#define INIT_TEXTURE_NUM 100
/*****************************************************************************/
/* */
/* TEXTURE_TABLE */
/* */
/* A symbol table permitting access to texture records by number or name. */
/* The table will automatically enlarge to accept any number of entries, */
/* but there is an arbitrary limit of 65535 textures imposed so that texture*/
/* numbers can be stored in 16 bit fields. */
/* */
/* ptab_new(newsize) New empty table, newsize capacity */
/* ptab_insert(x, &S) Insert new texture object x into S */
/* ptab_retrieve(str, S) Retrieve texture object of name str */
/* ptab_num(S, num) Retrieve texture object, number num */
/* ptab_debug(S, fp) Debug print of table S to file fp */
/* */
/*****************************************************************************/
typedef struct
{ int pattab_size; /* size of table */
int pattab_count; /* number of textures held */
struct pattab_rec
{ OBJECT by_number; /* texture record by number */
OBJECT by_name_hash; /* texture record by name */
} pattab[1];
} *TEXTURE_TABLE;
#define ptab_size(S) (S)->pattab_size
#define ptab_count(S) (S)->pattab_count
#define ptab_num(S, i) (S)->pattab[i].by_number
#define ptab_name(S, i) (S)->pattab[i].by_name_hash
#define hash(pos, str, S) \
{ FULL_CHAR *p = str; \
pos = *p++; \
while( *p ) pos += *p++; \
pos = pos % ptab_size(S); \
}
static TEXTURE_TABLE ptab_new(int newsize)
{ TEXTURE_TABLE S; int i;
ifdebug(DMA, D, DebugRegisterUsage(MEM_TEXTURE_TAB, 1,
2*sizeof(int) + newsize * sizeof(struct pattab_rec)));
S = (TEXTURE_TABLE) malloc(2*sizeof(int) + newsize * sizeof(struct pattab_rec));
if( S == (TEXTURE_TABLE) NULL )
Error(42, 1, "ran out of memory when enlarging texture table",
FATAL, no_fpos);
ptab_size(S) = newsize;
ptab_count(S) = 0;
for( i = 0; i < newsize; i++ )
{ ptab_num(S, i) = ptab_name(S, i) = nilobj;
}
return S;
} /* end ptab_new */
static void ptab_insert(OBJECT x, TEXTURE_TABLE *S);
static TEXTURE_TABLE ptab_rehash(TEXTURE_TABLE S, int newsize)
{ TEXTURE_TABLE NewS; int i;
NewS = ptab_new(newsize);
for( i = 1; i <= ptab_count(S); i++ )
ptab_insert(ptab_num(S, i), &NewS);
for( i = 0; i < ptab_size(S); i++ )
{ if( ptab_name(S, i) != nilobj ) DisposeObject(ptab_name(S, i));
}
ifdebug(DMA, D, DebugRegisterUsage(MEM_TEXTURE_TAB, -1,
-(2*sizeof(int) + ptab_size(S) * sizeof(struct pattab_rec))));
free(S);
return NewS;
} /* end ptab_rehash */
static void ptab_insert(OBJECT x, TEXTURE_TABLE *S)
{ int pos, num;
if( ptab_count(*S) == ptab_size(*S) - 1 ) /* one less since 0 unused */
*S = ptab_rehash(*S, 2*ptab_size(*S));
num = ++ptab_count(*S);
if( num > MAX_TEXTURE )
Error(42, 2, "too many textures (maximum is %d)",
FATAL, &fpos(x), MAX_TEXTURE);
hash(pos, string(x), *S);
if( ptab_name(*S, pos) == nilobj ) New(ptab_name(*S, pos), ACAT);
Link(ptab_name(*S, pos), x);
word_texture(x) = num;
ptab_num(*S, num) = x;
} /* end ptab_insert */
static OBJECT ptab_retrieve(FULL_CHAR *str, TEXTURE_TABLE S)
{ OBJECT x, link, y; int pos;
hash(pos, str, S);
x = ptab_name(S, pos);
if( x == nilobj ) return nilobj;
for( link = Down(x); link != x; link = NextDown(link) )
{ Child(y, link);
if( StringEqual(str, string(y)) ) return y;
}
return nilobj;
} /* end ptab_retrieve */
#if DEBUG_ON
static void ptab_debug(TEXTURE_TABLE S, FILE *fp)
{ int i; OBJECT x, link, y;
fprintf(fp, " table size: %d; current number of textures: %d%s",
ptab_size(S), ptab_count(S), STR_NEWLINE);
for( i = 0; i < ptab_size(S); i++ )
{ x = ptab_num(S, i);
fprintf(fp, " ptab_num(S, %d) = %s%s", i,
x == nilobj ? AsciiToFull("<nilobj>") :
is_word(type(x)) ? string(x) : AsciiToFull("not WORD!"), STR_NEWLINE);
}
fprintf(fp, "%s", STR_NEWLINE);
for( i = 0; i < ptab_size(S); i++ )
{ x = ptab_name(S, i);
fprintf(fp, "ptab_name(S, %d) =", i);
if( x == nilobj )
fprintf(fp, " <nilobj>");
else if( type(x) != ACAT )
fprintf(fp, " not ACAT!");
else for( link = Down(x); link != x; link = NextDown(link) )
{ Child(y, link);
fprintf(fp, " %s",
is_word(type(y)) ? string(y) : AsciiToFull("not-WORD!"));
}
fprintf(fp, STR_NEWLINE);
}
} /* end ptab_debug */
#endif
static TEXTURE_TABLE pat_tab;
/*****************************************************************************/
/* */
/* UseTexture */
/* */
/* When set to FALSE (by z01.c), means to ignore texture changing commands. */
/* */
/*****************************************************************************/
BOOLEAN UseTexture = TRUE;
/*****************************************************************************/
/* */
/* TextureInit() */
/* */
/* Initialize this module. */
/* */
/*****************************************************************************/
void TextureInit(void)
{ OBJECT cname;
/* initial texture table is empty */
pat_tab = ptab_new(INIT_TEXTURE_NUM);
/* insert "LoutTextureSolid" as texture number 1 */
cname = MakeWord(WORD, AsciiToFull("LoutTextureSolid"), no_fpos);
ptab_insert(cname, &pat_tab);
} /* end TextureInit */
/*****************************************************************************/
/* */
/* TextureChange(style, x) */
/* */
/* Change the current style to contain the texture of texture command x. */
/* */
/*****************************************************************************/
void TextureChange(STYLE *style, OBJECT x)
{ OBJECT cname;
debug2(DTX, D, "TextureChange(%s, %s)", EchoStyle(style), EchoObject(x));
/* if argument is not a word, fail and exit */
if( !is_word(type(x)) )
{ Error(42, 3, "%s ignored (illegal left parameter)", WARN, &fpos(x),
KW_TEXTURE);
debug0(DTX, D, "TextureChange returning (texture unchanged)");
return;
}
/* if not using textures, do nothing */
if( !UseTexture )
{ debug0(DTX, D, "TextureChange returning (not UseTexture)");
return;
}
/* if argument is nochange, do nothing */
if( StringEqual(string(x), STR_TEXTURE_NOCHANGE) ||
StringEqual(string(x), STR_EMPTY) )
{ debug0(DTX, D, "TextureChange returning (texture nochange)");
return;
}
/* retrieve texture command if present, else insert it */
{ cname = ptab_retrieve(string(x), pat_tab);
if( cname == nilobj )
{ cname = MakeWord(type(x), string(x), &fpos(x));
ptab_insert(cname, &pat_tab);
texture(*style) = word_texture(cname);
}
else texture(*style) = word_texture(cname);
}
debug2(DTX, D, "TextureChange returning %d (texture = %s)",
texture(*style), string(cname));
ifdebug(DTX, DD, ptab_debug(pat_tab, stderr));
} /* TextureChange */
/*@::TextureCommand()@********************************************************/
/* */
/* FULL_CHAR *TextureCommand(pnum) */
/* */
/* Return the PostScript command for producing texture pnum. */
/* */
/*****************************************************************************/
FULL_CHAR *TextureCommand(TEXTURE_NUM pnum)
{ FULL_CHAR *res;
debug1(DTX, D, "TextureCommand(%d)", pnum);
assert( pnum > 0 && pnum <= ptab_count(pat_tab), "TextureCommand: number" );
res = string(ptab_num(pat_tab, pnum));
debug1(DTX, D, "TextureCommand returning %s", res);
return res;
} /* end TextureCommand */
