/*  $Id: font.c,v 1.22 2005/11/02 15:59:06 jan Exp $

    Part of XPCE --- The SWI-Prolog GUI toolkit

    Author:        Jan Wielemaker and Anjo Anjewierden
    E-mail:        wielemak@science.uva.nl
    WWW:           http://www.swi-prolog.org/packages/xpce/
    Copyright (C): 1985-2005, University of Amsterdam

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <h/kernel.h>
#include <h/graphics.h>

static status	defaultPostScriptFont(FontObj f);
static Int	getPointsFont(FontObj f);

static Name
fontName(Name family, Name style, Int points)
{ string s;
  Any av[3];
  Name rc;

  av[0] = family;
  av[1] = style;
  av[2] = points;

  str_writefv(&s, (CharArray)CtoTempString("%s_%s_%d"), 3, av);
  
  rc = StringToName(&s);
  str_unalloc(&s);

  return rc;
}


static status
initialiseFont(FontObj f, Name family, Name style, Int points, Name xname)
{ Name name = fontName(family, style, points);

  assign(f, family,      family);
  assign(f, style,       style);
  assign(f, points,      points);
  assign(f, fixed_width, DEFAULT);
  assign(f, iswide,	 DEFAULT);
  assign(f, x_name,      xname);

  defaultPostScriptFont(f);

  protectObject(f);
  newAssoc(name, f);

  return appendHashTable(FontTable, name, f);
}


static FontObj
getLookupFont(Class class, Name family, Name style, Int points)
{ Name name = fontName(family, style, points);
  FontObj f2;

  makeBuiltinFonts();
  if ( (f2 = getMemberHashTable(FontTable, name)) )
    answer(f2);

  fail;
}


static FontObj
getConvertFont(Class class, Name name)
{ char *s = strName(name);

  makeBuiltinFonts();

  if ( s[0] == '@' )
  { Name ref_name;

    for(s++; *s == ' ' || *s == '\t'; s++)
      ;
    ref_name = CtoKeyword(s);

    answer(getMemberHashTable(FontTable, ref_name));
  } else
  { DisplayObj d = CurrentDisplay(NIL);
    FontObj f;
    Name fn = (syntax.uppercase ? CtoKeyword(s) : name);

    if ( d && (f = getMemberHashTable(d->font_table, fn)) )
    { answer(f);
    } else
    { for_hash_table(FontTable, sy,
		     { FontObj f = sy->value;
		       if ( f->x_name == fn ) /* case? */
			 answer(f);
		     })
    }
  }

  fail;
}


status
replaceFont(FontObj f, DisplayObj d)
{ FontObj nofont;
  void *wsref;

  if ( !(nofont = getClassVariableValueObject(d, NAME_noFont)) )
    errorPce(f, NAME_noDefaultFont);
  
  if ( !(wsref = getXrefObject(nofont, d)) )
    fail;

  errorPce(f, NAME_replacedFont, nofont);
  registerXrefObject(f, d, wsref);

  assign(f, fixed_width, nofont->fixed_width);

  succeed;
}


static status
XopenFont(FontObj f, DisplayObj d)
{ if ( isDefault(d) )
    d = CurrentDisplay(f);

  makeBuiltinFonts();

  if ( !ws_create_font(f, d) )
  { errorPce(f, NAME_noRelatedXFont);
    return replaceFont(f, d);
  }      

  succeed;
}


static status
XcloseFont(FontObj f, DisplayObj d)
{ ws_destroy_font(f, d);

  succeed;
}


status
makeBuiltinFonts(void)
{ DisplayObj d;
  static int done = FALSE;

  if ( done )
    succeed;
  done = TRUE;

  if ( (d = CurrentDisplay(NIL)) &&
       send(d, NAME_loadFonts, EAV) &&	/* XPCE predefined fonts */
       ws_system_fonts(d) &&		/* Window-system fonts */
       send(d, NAME_loadFontAliases, NAME_systemFonts, EAV) )
  { send(d, NAME_loadFontAliases, NAME_userFonts, EAV);
    succeed;
  }

  fail;
}

		/********************************
		*          POSTSCRIPT		*
		********************************/

static status
defaultPostScriptFont(FontObj f)
{ char buf[LINESIZE];

  if ( f->family == NAME_helvetica )
  { strcpy(buf, "Helvetica");

    if ( f->style == NAME_bold )
      strcat(buf, "-Bold");
    else if ( f->style == NAME_oblique )
      strcat(buf, "-Oblique");
  } else if ( f->family == NAME_times )
  { strcpy(buf, "Times");

    if ( f->style == NAME_bold )
      strcat(buf, "-Bold");
    else if ( f->style == NAME_italic )
      strcat(buf, "-Italic");
    else /*if ( f->style == NAME_roman )*/
      strcat(buf, "-Roman");
  } else if ( f->style == NAME_ansiVar )
  { strcpy(buf, "Helvetica");
  } else				/* default */
  { strcpy(buf, "Courier");

    if ( f->style == NAME_bold )
      strcat(buf, "-Bold");
    else if ( f->style == NAME_oblique )
      strcat(buf, "-Oblique");
  }

  assign(f, postscript_size, getPointsFont(f));
  assign(f, postscript_font, CtoName(buf));

  succeed;
}


		/********************************
		*           GET INFO		*
		********************************/


Int
getWidthFont(FontObj f, CharArray txt)
{ if ( isDefault(txt) )
    txt = (CharArray) NAME_x;

  d_ensure_display();			/* TBD */

  answer(toInt(str_width(&txt->data, 0, txt->data.size, f)));
}


Int
getAdvanceFont(FontObj f, CharArray txt)
{ d_ensure_display();			/* TBD */

  return toInt(str_advance(&txt->data, 0, txt->data.size, f));
}


Int
getExFont(FontObj f)
{ if ( isNil(f->ex) )
    assign(f, ex, toInt(c_width('x', f)));

  answer(f->ex);
}


Int
getHeightFont(FontObj f)
{ d_ensure_display();

  answer(toInt(s_height(f)));
}


Int
getAscentFont(FontObj f)
{ d_ensure_display();

  answer(toInt(s_ascent(f)));
}


Int
getDescentFont(FontObj f)
{ d_ensure_display();

  answer(toInt(s_descent(f)));
}


static Size
getSizeFont(FontObj f)
{ answer(answerObject(ClassSize, getExFont(f), getHeightFont(f), EAV));
}


Bool
getFixedWidthFont(FontObj f)
{ if ( isDefault(f->fixed_width) )
  { getXrefObject(f, CurrentDisplay(NIL));

    if ( c_width('x', f) == c_width('W', f) )
      assign(f, fixed_width, ON);
    else
      assign(f, fixed_width, OFF);
  }

  answer(f->fixed_width);
}


Bool
getB16Font(FontObj f)
{ if ( isDefault(f->iswide) )
    XopenFont(f, CurrentDisplay(NIL));

  answer(f->iswide);
}


static status
memberFont(FontObj f, Int chr)
{ d_ensure_display();

  if ( s_has_char(f, valInt(chr)) )
    succeed;

  fail;
}


static Int
getDefaultCharacterFont(FontObj f)
{ d_ensure_display();

  answer(toInt(s_default_char(f)));
}


static Tuple
getDomainFont(FontObj f, Name which)
{ int a, z;

  if ( isDefault(which) )
    which = NAME_x;

  f_domain(f, which, &a, &z);
  return answerObject(ClassTuple, toInt(a), toInt(z), EAV);
}


static Int
getPointsFont(FontObj f)
{ if ( notDefault(f->points) )
    answer(f->points);

  answer(getHeightFont(f));
}


		 /*******************************
		 *	 CLASS DECLARATION	*
		 *******************************/

/* Type declarations */

static char *T_initialise[] =
        { "family=name", "style=name", "points=[int]", "x_name=[name]" };
static char *T_lookup[] =
        { "name", "name", "[int]" };

/* Instance Variables */

static vardecl var_font[] =
{ IV(NAME_family, "name", IV_GET,
     NAME_name, "Family the font belongs to (times, etc.)"),
  IV(NAME_style, "name", IV_GET,
     NAME_name, "Style of the font (bold, italic, etc.)"),
  IV(NAME_points, "[int]", IV_NONE,
     NAME_name, "Point-size of the font"),
  IV(NAME_ex, "int*", IV_NONE,
     NAME_dimension, "Width of the letter `x' in this font"),
  IV(NAME_xName, "[name]", IV_GET,
     NAME_x, "Window-system name for the font"),
  IV(NAME_fixedWidth, "[bool]", IV_NONE,
     NAME_property, "If @off, font is proportional"),
  IV(NAME_b16, "[bool]", IV_NONE,
     NAME_property, "If @on, font is a 16-bit font"),
  IV(NAME_postscriptFont, "name", IV_BOTH,
     NAME_postscript, "PostScript-name of the font"),
  IV(NAME_postscriptSize, "int", IV_BOTH,
     NAME_postscript, "PostScript point-size of the font")
};

/* Send Methods */

static senddecl send_font[] =
{ SM(NAME_initialise, 4, T_initialise, initialiseFont,
     DEFAULT, "Create from fam, style, points, name"),
  SM(NAME_member, 1, "char", memberFont,
     NAME_set, "Test if font defines character"),
  SM(NAME_Xclose, 1, "display", XcloseFont,
     NAME_x, "Destroy associated window-system resources"),
  SM(NAME_Xopen, 1, "display", XopenFont,
     NAME_x, "Open the associated window-system resources")
};

/* Get Methods */

static getdecl get_font[] =
{ GM(NAME_points, 0, "int", NULL, getPointsFont,
     DEFAULT, "Specified point-size or <-height"),
  GM(NAME_convert, 1, "font", "name", getConvertFont,
     NAME_conversion, "Convert logical font-name and @family_style_points"),
  GM(NAME_ascent, 0, "int", NULL, getAscentFont,
     NAME_dimension, "Highest point above baseline"),
  GM(NAME_descent, 0, "int", NULL, getDescentFont,
     NAME_dimension, "Lowest point below baseline"),
  GM(NAME_ex, 0, "int", NULL, getExFont,
     NAME_dimension, "Width of the letter `x'"),
  GM(NAME_height, 0, "int", NULL, getHeightFont,
     NAME_dimension, "Height of highest character in font"),
  GM(NAME_size, 0, "size", NULL, getSizeFont,
     NAME_dimension, "New size from <-width and <-height"),
  GM(NAME_width, 1, "int", "[char_array]", getWidthFont,
     NAME_dimension, "Width of string (default \"x\")"),
  GM(NAME_advance, 1, "int", "char_array", getAdvanceFont,
     NAME_dimension, "X-origin advancement of string"),
  GM(NAME_b16, 0, "bool", NULL, getB16Font,
     NAME_encoding, "Boolean to indicate font is 16-bits"),
  GM(NAME_lookup, 3, "font", T_lookup, getLookupFont,
     NAME_oms, "Lookup in @fonts table"),
  GM(NAME_defaultCharacter, 0, "char", NULL, getDefaultCharacterFont,
     NAME_property, "Character painted for non-existing entries"),
  GM(NAME_domain, 1, "tuple", "[{x,y}]", getDomainFont,
     NAME_property, "Range of valid characters"),
  GM(NAME_fixedWidth, 0, "bool", NULL, getFixedWidthFont,
     NAME_property, "Boolean to indicate font is fixed-width")
};

/* Resources */

static classvardecl rc_font[] =
{ RC(NAME_scale, "real", "1.4",
     "Multiplication factor for all fonts")
};

/* Class Declaration */

static Name font_termnames[] = { NAME_family, NAME_style, NAME_points };

ClassDecl(font_decls,
          var_font, send_font, get_font, rc_font,
          3, font_termnames,
          "$Rev$");


status
makeClassFont(Class class)
{ declareClass(class, &font_decls);

  saveStyleClass(class, NAME_external);
  cloneStyleClass(class, NAME_none);

  FontTable = globalObject(NAME_fonts, ClassHashTable, toInt(101), EAV);

  succeed;
}
