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// This file is part of Roxen WebServer. 
// Copyright © 1996 - 2009, Roxen IS. 
 
#if !constant(Image.FreeType.Face) 
#if constant(has_Image_TTF) 
#include <config.h> 
constant cvs_version = "$Id$"; 
 
constant name = "TTF fonts"; 
constant doc = "True Type font loader. Uses freetype to render text."; 
constant scalable = 1; 
 
inherit FontHandler; 
 
protected mapping ttf_font_names_cache; 
 
protected string trimttfname( string n ) 
{ 
  n = lower_case(replace( n, "\t", " " )); 
  return ((n/" ")*"")-"'"; 
} 
 
protected string translate_ttf_style( string style ) 
{ 
  //  Check for weight. Default is "n" for normal/regular/roman. 
  style = lower_case((style - "-") - " "); 
  string weight = "n";  
  if (has_value(style, "bold")) 
    weight = "b"; 
  else if (has_value(style, "black")) 
    weight = "B"; 
  else if (has_value(style, "light")) 
    weight = "l"; 
   
  //  Check for slant. Default is "n" for regular. 
  string slant = "n"; 
  if (has_value(style, "italic") || 
      has_value(style, "oblique")) 
    slant = "i"; 
 
  //  Combine to full style 
  return weight + slant; 
} 
 
protected void build_font_names_cache( ) 
{ 
  mapping ttf_done = ([ ]); 
  mapping new_ttf_font_names_cache=([]); 
  void traverse_font_dir( string dir )  
  { 
    dir = roxen_path (dir); 
    foreach(r_get_dir( dir )||({}), string fname) 
    { 
      string path=combine_path(dir+"/",fname); 
      if(!ttf_done[path]++) 
      { 
        Stat a=file_stat(path); 
        if(a && a[1]==-2) { 
          if( !file_stat( path+"/fontname" ) )  
            // no, we do not want to try this dir. :-) 
            traverse_font_dir( path ); 
          continue; 
        } 
        // Here is a good place to impose the artificial restraint that 
        // the file must match *.ttf 
        Image.TTF ttf; 
        if(catch(ttf = Image.TTF( combine_path(dir+"/",fname) ))) 
          continue; 
        if(ttf) 
        { 
          mapping n = ttf->names(); 
          string f = lower_case(trimttfname(n->family)); 
          if(!new_ttf_font_names_cache[f]) 
            new_ttf_font_names_cache[f] = ([]); 
          new_ttf_font_names_cache[f][ translate_ttf_style(n->style) ] = 
            combine_path(dir+"/",fname); 
        } 
      } 
    } 
  }; 
  map( roxen->query("font_dirs"), traverse_font_dir ); 
 
  ttf_font_names_cache = new_ttf_font_names_cache; 
} 
 
 
 
class TTFWrapper 
{ 
  inherit Font; 
  protected int size, rsize; 
  protected object real; 
  protected Charset.Encoder encoder; 
  protected function(string ...:Image.image) real_write; 
  protected int fake_bold, fake_italic; 
 
  int height( ) 
  { 
    return rsize ? rsize : (rsize = text_extents("W")[1] ); 
  } 
 
  protected string _sprintf() 
  { 
    return sprintf( "TTF(%O,%d)", real, size ); 
  } 
 
  protected Image.image write_encoded(string ... what) 
  { 
    return real->write(@(encoder? 
                         Array.map(what, lambda(string s) { 
                                           return encoder->clear()-> 
                                                  feed(s)->drain(); 
                                         }):what)); 
  } 
 
  // FIXME: Handle x_spacing 
  Image.Image write( string ... what ) 
  { 
    if( !sizeof( what ) ) 
      return Image.Image( 1,height() ); 
 
    int oversample = roxen->query("font_oversampling"); 
 
    // nbsp -> "" 
    what = map( (array(string))what, replace, " ", "" ); 
 
    // cannot write "" with Image.TTF. 
    what = replace( what, "", " " ); 
 
    array(Image.Image) res = map( what, real_write ); 
 
    int image_width = max(0, @res->xsize()); 
    int image_height = 
      (int)abs(`+(0, 0, @res[..sizeof(res) - 2]->ysize()) * y_spacing) + 
      res[-1]->ysize(); 
    int y_add = 0; 
    if (oversample) { 
      //  Make sure image dimensions are a multiple of 2. If height is odd 
      //  we'll offset the text baseline one pixel to get the extra line at 
      //  the top of the image. 
      image_width = (image_width + 1) & 0xFFFFFFFE; 
      y_add = (image_height & 1); 
      image_height = (image_height + 1) & 0xFFFFFFFE; 
    } 
    Image.Image rr = Image.Image(image_width, image_height); 
     
    float start; 
    if( y_spacing < 0 ) 
      start = (float)rr->ysize()-res[0]->ysize(); 
    start += (float) y_add; 
     
    foreach( res, object r ) 
    { 
      if( j_right ) 
        rr->paste_alpha_color( r, 255,255,255, rr->xsize()-r->xsize(), (int)start ); 
      else if( j_center ) 
        rr->paste_alpha_color( r, 255,255,255,(rr->xsize()-r->xsize())/2, (int)start ); 
      else 
        rr->paste_alpha_color( r, 255,255,255, 0, (int)start ); 
      start += r->ysize()*y_spacing; 
    } 
    if( fake_bold ) 
    { 
      object r2 = Image.Image( rr->xsize()+2, rr->ysize() ); 
      object r3 = rr*0.3; 
      for( int i = 0; i<2; i++ ) 
        for( int j = 0; j<2; j++ ) 
          r2->paste_alpha_color( r3,  255, 255, 255, i, j ); 
      rr = r2->paste_alpha_color( rr, 255,255,255, 1,1 ); 
    } 
    rr->setcolor( 0,0,0 ); 
    if( fake_italic ) 
      rr = rr->skewx( -(rr->ysize()/3) ); 
    if (oversample) 
      return rr->scale(0.5); 
    else 
      return rr; 
  } 
 
  array text_extents( string what ) 
  { 
    Image.Image o = write( what ); 
    return ({ o->xsize(), o->ysize() }); 
  } 
 
  void create(object r, int s, string fn, int fb, int fi) 
  { 
    string encoding; 
    fake_bold = fb; 
    fake_italic = fi; 
    real = r; 
    size = s; 
    if( roxen->query("font_oversampling") ) 
      real->set_height( (int)(size*64/34.5) ); // aproximate to pixels 
    else 
      real->set_height( (int)(size*32/34.5) ); // aproximate to pixels 
 
    if(r_file_stat(fn+".properties")) 
      parse_html(lopen(fn+".properties","r")->read(), ([]), 
                 (["encoding":lambda(string tag, mapping m, string enc) { 
                                encoding = enc; 
                              }])); 
 
    if(encoding) 
      encoder = Charset.encoder(encoding, ""); 
 
    real_write = (encoder? write_encoded : real->write); 
  } 
} 
 
#ifdef THREADS 
Thread.Mutex lock = Thread.Mutex(); 
#endif 
 
array available_fonts(int(0..1)|void force_reload) 
{ 
#ifdef THREADS 
  object key = lock->lock(); 
#endif 
  if( !ttf_font_names_cache || force_reload ) build_font_names_cache( ); 
  return indices( ttf_font_names_cache ); 
} 
 
array(mapping) font_information( string font ) 
{ 
  if( !has_font( font, 0 ) ) 
    return ({}); 
 
  mapping res = ([  
    "name":font, 
    "format":"ttf", 
  ]); 
  Image.TTF f; 
  if( font[0] == '/' ) 
    f = Image.TTF( font ); 
  else 
    f = Image.TTF( (font=values(ttf_font_names_cache[ font ])[0]) ); 
 
  res->path = font; 
  res |= f->names(); 
  return ({ res }); 
} 
 
array(string) has_font( string name, int size, int(0..1)|void force ) 
{ 
#ifdef THREADS 
  object key = lock->lock(); 
#endif 
  if( !ttf_font_names_cache  ) 
    build_font_names_cache( ); 
  if( ttf_font_names_cache[ name ] ) 
    return indices(ttf_font_names_cache[ name ]); 
  if (force) { 
    build_font_names_cache(); 
    if( ttf_font_names_cache[ name ] ) 
      return indices(ttf_font_names_cache[ name ]); 
  } 
} 
 
Font open(string f, int size, int bold, int italic ) 
{ 
  string tmp; 
  int|string style = font_style( f, size, bold, italic ); 
  object fo; 
 
  if( style == -1 ) // exact file 
  { 
    if( fo = Image.TTF( name ) ) 
      return TTFWrapper( fo, size, f,0,0 ); 
    return 0; 
  } 
 
  if (!ttf_font_names_cache) { 
    build_font_names_cache(); 
  } 
 
  if(ttf_font_names_cache[ lower_case(f) ]) 
  { 
    f = lower_case(f); 
    if( tmp = ttf_font_names_cache[ f ][ style ] ) 
    { 
      fo = Image.TTF( tmp ); 
      if( fo ) return TTFWrapper( fo(), size, tmp,0,0 ); 
    } 
    if( fo = Image.TTF( roxen_path(f = values(ttf_font_names_cache[ f ])[0]))) 
      return TTFWrapper( fo(), size, f, bold, italic ); 
  } 
  return 0; 
} 
 
 
 
 
void create() 
{ 
  roxen.getvar( "font_dirs" ) 
      ->add_changed_callback( lambda(Variable.Variable v){ 
                                ttf_font_names_cache=0; 
                              } ); 
} 
#endif 
#endif