gd-libgd / src / gdft.c

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/********************************************/
/* gd interface to freetype library         */
/*                                          */
/* John Ellson   ellson@graphviz.org        */
/********************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "gd.h"
#include "gdhelpers.h"
#include "entities.h"

/* 2.0.10: WIN32, not MSWIN32 */
#ifndef WIN32
#include <unistd.h>
#else
#include <io.h>
#define R_OK 04			/* Needed in Windows */
#endif

/* number of antialised colors for indexed bitmaps */
#define NUMCOLORS 8

BGD_DECLARE(char *) gdImageStringTTF (gdImage * im, int *brect, int fg, char *fontlist,
		  double ptsize, double angle, int x, int y, char *string)
{
  /* 2.0.6: valid return */
  return gdImageStringFT (im, brect, fg, fontlist, ptsize,
			  angle, x, y, string);
}

#ifndef HAVE_LIBFREETYPE
BGD_DECLARE(char *) gdImageStringFTEx (gdImage * im, int *brect, int fg, char *fontlist,
		   double ptsize, double angle, int x, int y, char *string,
		   gdFTStringExtraPtr strex)
{
  return "libgd was not built with FreeType font support\n";
}

BGD_DECLARE(char *) gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
		 double ptsize, double angle, int x, int y, char *string)
{
  return "libgd was not built with FreeType font support\n";
}
#else

#include "gdcache.h"
/* 2.0.16 Christophe Thomas: starting with FreeType 2.1.6, this is
  mandatory, and it has been supported for a long while. */
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H

/* number of fonts cached before least recently used is replaced */
#define FONTCACHESIZE 6

/* number of antialias color lookups cached */
#define TWEENCOLORCACHESIZE 32

/*
 * Line separation as a factor of font height.  
 *      No space between if LINESPACE = 1.00 
 *      Line separation will be rounded up to next pixel row.
 */
#define LINESPACE 1.05

/*
 * The character (space) used to separate alternate fonts in the
 * fontlist parameter to gdImageStringFT. 2.0.18: space was a
 * poor choice for this.
 */
#define LISTSEPARATOR ";"

/*
 * DEFAULT_FONTPATH and PATHSEPARATOR are host type dependent and
 * are normally set by configure in config.h.  These are just
 * some last resort values that might match some Un*x system
 * if building this version of gd separate from graphviz.
 */
#ifndef DEFAULT_FONTPATH
#if defined(__APPLE__) || (defined(__MWERKS__) && defined(macintosh))
#define DEFAULT_FONTPATH "/usr/share/fonts/truetype:/System/Library/Fonts:/Library/Fonts"
#else
#define DEFAULT_FONTPATH "/usr/share/fonts/truetype"
#endif
#endif
#ifndef PATHSEPARATOR
#define PATHSEPARATOR ":"
#endif

#ifndef TRUE
#define FALSE 0
#define TRUE !FALSE
#endif

#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)<(b)?(a):(b))

typedef struct
{
  char *fontlist;		/* key */
  FT_Library *library;
  FT_Face face;
  FT_Bool have_char_map_unicode, have_char_map_big5, have_char_map_sjis,
    have_char_map_apple_roman;
  gdCache_head_t *glyphCache;
}
font_t;

typedef struct
{
  char *fontlist;		/* key */
  FT_Library *library;
}
fontkey_t;

typedef struct
{
  int pixel;			/* key */
  int bgcolor;			/* key */
  int fgcolor;			/* key *//* -ve means no antialias */
  gdImagePtr im;		/* key */
  int tweencolor;
}
tweencolor_t;

typedef struct
{
  int pixel;			/* key */
  int bgcolor;			/* key */
  int fgcolor;			/* key *//* -ve means no antialias */
  gdImagePtr im;		/* key */
}
tweencolorkey_t;

/********************************************************************
 * gdTcl_UtfToUniChar is borrowed from Tcl ...
 */
/*
 * tclUtf.c --
 *
 *      Routines for manipulating UTF-8 strings.
 *
 * Copyright (c) 1997-1998 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) tclUtf.c 1.25 98/01/28 18:02:43
 */

/*
 *---------------------------------------------------------------------------
 *
 * gdTcl_UtfToUniChar --
 *
 *      Extract the Tcl_UniChar represented by the UTF-8 string.  Bad
 *      UTF-8 sequences are converted to valid Tcl_UniChars and processing
 *      continues.  Equivalent to Plan 9 chartorune().
 *
 *      The caller must ensure that the source buffer is long enough that
 *      this routine does not run off the end and dereference non-existent
 *      memory looking for trail bytes.  If the source buffer is known to
 *      be '\0' terminated, this cannot happen.  Otherwise, the caller
 *      should call Tcl_UtfCharComplete() before calling this routine to
 *      ensure that enough bytes remain in the string.
 *
 * Results:
 *      *chPtr is filled with the Tcl_UniChar, and the return value is the
 *      number of bytes from the UTF-8 string that were consumed.
 *
 * Side effects:
 *      None.
 *
 *---------------------------------------------------------------------------
 */

#ifdef JISX0208
#include "jisx0208.h"
#endif

static int comp_entities(const void *e1, const void *e2) {
  struct entities_s *en1 = (struct entities_s *) e1;
  struct entities_s *en2 = (struct entities_s *) e2;
  return strcmp(en1->name, en2->name);
}

#define Tcl_UniChar int
#define TCL_UTF_MAX 3
static int
gdTcl_UtfToUniChar (char *str, Tcl_UniChar * chPtr)
/* str is the UTF8 next character pointer */
/* chPtr is the int for the result */
{
  int byte;
  char entity_name_buf[ENTITY_NAME_LENGTH_MAX+1];
  char *p;
  struct entities_s key, *res;

  /* HTML4.0 entities in decimal form, e.g. &#197; */
  /*           or in hexadecimal form, e.g. &#x6C34; */
  byte = *((unsigned char *) str);
  if (byte == '&')
    {
      int i, n = 0;

      byte = *((unsigned char *) (str + 1));
      if (byte == '#')
	{
          byte = *((unsigned char *) (str + 2));
          if (byte == 'x' || byte == 'X')
            {
              for (i = 3; i < 8; i++)
                {
                  byte = *((unsigned char *) (str + i));
                  if (byte >= 'A' && byte <= 'F')
                    byte = byte - 'A' + 10;
                  else if (byte >= 'a' && byte <= 'f')
                    byte = byte - 'a' + 10;
                  else if (byte >= '0' && byte <= '9')
                    byte = byte - '0';
                  else
                    break;
                  n = (n * 16) + byte;
                }
            }
          else
            {
	      for (i = 2; i < 8; i++)
	        {
	          byte = *((unsigned char *) (str + i));
	          if (byte >= '0' && byte <= '9')
	            n = (n * 10) + (byte - '0');
	          else
		    break;
		}
	    }
	  if (byte == ';')
	    {
	      *chPtr = (Tcl_UniChar) n;
	      return ++i;
	    }
	}
      else
        {
          key.name = p = entity_name_buf;
          for (i = 1; i < 1 + ENTITY_NAME_LENGTH_MAX; i++)
            {
              byte = *((unsigned char *) (str + i));
              if (byte == '\0')
                break;
              if (byte == ';')
                {
                  *p++ = '\0';
                  res = bsearch(&key, entities, NR_OF_ENTITIES,
                       sizeof(entities[0]), *comp_entities);
                  if (res)
                    {
                      *chPtr = (Tcl_UniChar) res->value;
                      return ++i;
                    }
                  break;
               }
              *p++ = byte;
            }
        }
    }

  /*
   * Unroll 1 to 3 byte UTF-8 sequences, use loop to handle longer ones.
   */

  byte = *((unsigned char *) str);
#ifdef JISX0208
  if (0xA1 <= byte && byte <= 0xFE)
    {
      int ku, ten;

      ku = (byte & 0x7F) - 0x20;
      ten = (str[1] & 0x7F) - 0x20;
      if ((ku < 1 || ku > 92) || (ten < 1 || ten > 94))
	{
	  *chPtr = (Tcl_UniChar) byte;
	  return 1;
	}

      *chPtr = (Tcl_UniChar) UnicodeTbl[ku - 1][ten - 1];
      return 2;
    }
  else
#endif /* JISX0208 */
  if (byte < 0xC0)
    {
      /*
       * Handles properly formed UTF-8 characters between
       * 0x01 and 0x7F.  Also treats \0 and naked trail
       * bytes 0x80 to 0xBF as valid characters representing
       * themselves.
       */

      *chPtr = (Tcl_UniChar) byte;
      return 1;
    }
  else if (byte < 0xE0)
    {
      if ((str[1] & 0xC0) == 0x80)
	{
	  /*
	   * Two-byte-character lead-byte followed
	   * by a trail-byte.
	   */

	  *chPtr = (Tcl_UniChar) (((byte & 0x1F) << 6) | (str[1] & 0x3F));
	  return 2;
	}
      /*
       * A two-byte-character lead-byte not followed by trail-byte
       * represents itself.
       */

      *chPtr = (Tcl_UniChar) byte;
      return 1;
    }
  else if (byte < 0xF0)
    {
      if (((str[1] & 0xC0) == 0x80) && ((str[2] & 0xC0) == 0x80))
	{
	  /*
	   * Three-byte-character lead byte followed by
	   * two trail bytes.
	   */

	  *chPtr = (Tcl_UniChar) (((byte & 0x0F) << 12)
				  | ((str[1] & 0x3F) << 6) | (str[2] & 0x3F));
	  return 3;
	}
      /*
       * A three-byte-character lead-byte not followed by
       * two trail-bytes represents itself.
       */

      *chPtr = (Tcl_UniChar) byte;
      return 1;
    }
#if TCL_UTF_MAX > 3
  else
    {
      int ch, total, trail;

      total = totalBytes[byte];
      trail = total - 1;
      if (trail > 0)
	{
	  ch = byte & (0x3F >> trail);
	  do
	    {
	      str++;
	      if ((*str & 0xC0) != 0x80)
		{
		  *chPtr = byte;
		  return 1;
		}
	      ch <<= 6;
	      ch |= (*str & 0x3F);
	      trail--;
	    }
	  while (trail > 0);
	  *chPtr = ch;
	  return total;
	}
    }
#endif

  *chPtr = (Tcl_UniChar) byte;
  return 1;
}

/********************************************************************/
/* font cache functions                                             */

static int
fontTest (void *element, void *key)
{
  font_t *a = (font_t *) element;
  fontkey_t *b = (fontkey_t *) key;

  return (strcmp (a->fontlist, b->fontlist) == 0);
}

static void *
fontFetch (char **error, void *key)
{
  font_t *a;
  fontkey_t *b = (fontkey_t *) key;
  int n;
  int font_found = 0;
  unsigned short platform, encoding;
  char *fontsearchpath, *fontlist;
  char *fullname = NULL;
  char *name, *path, *dir;
  char *strtok_ptr;
  FT_Error err;
  FT_CharMap found = 0;
  FT_CharMap charmap;

  a = (font_t *) gdMalloc (sizeof (font_t));
  a->fontlist = strdup (b->fontlist);
  a->library = b->library;

  /*
   * Search the pathlist for any of a list of font names.
   */
  fontsearchpath = getenv ("GDFONTPATH");
  if (!fontsearchpath)
    fontsearchpath = DEFAULT_FONTPATH;
  fontlist = strdup (a->fontlist);

  /*
   * Must use gd_strtok_r else pointer corrupted by strtok in nested loop.
   */
  for (name = gd_strtok_r (fontlist, LISTSEPARATOR, &strtok_ptr); name;
       name = gd_strtok_r (0, LISTSEPARATOR, &strtok_ptr))
    {

      /* make a fresh copy each time - strtok corrupts it. */
      path = strdup (fontsearchpath);
      /*
       * Allocate an oversized buffer that is guaranteed to be
       * big enough for all paths to be tested.
       */
      /* 2.0.22: Thorben Kundinger: +8 is needed, not +6. */
      fullname = gdRealloc (fullname,
			    strlen (fontsearchpath) + strlen (name) + 8);
      /* if name is an absolute or relative pathname then test directly */
      if (strchr (name, '/')
	  || (name[0] != 0 && name[1] == ':'
	      && (name[2] == '/' || name[2] == '\\')))
	{
	  sprintf (fullname, "%s", name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      /* 2.0.16: memory leak fixed, Gustavo Scotti */
	      gdFree (path);
	      break;
	    }
	}
      for (dir = strtok (path, PATHSEPARATOR); dir;
	   dir = strtok (0, PATHSEPARATOR))
	{
          if (strchr (name, '.'))
            {
              sprintf (fullname, "%s/%s", dir, name);
              if (access (fullname, R_OK) == 0)
                {
                  font_found++;
                  break;
                }
              else
                {
                  continue;
                }
            }
	  sprintf (fullname, "%s/%s.ttf", dir, name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      break;
	    }
	  sprintf (fullname, "%s/%s.pfa", dir, name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      break;
	    }
	  sprintf (fullname, "%s/%s.pfb", dir, name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      break;
	    }
	  sprintf (fullname, "%s/%s.dfont", dir, name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      break;
	    }
	}
      gdFree (path);
      if (font_found)
	break;
    }
  gdFree (fontlist);
  if (!font_found)
    {
      *error = "Could not find/open font";
      /* 2.0.12: TBB: free these. Thanks to Frank Faubert. */
      free (a->fontlist);
      free (fullname);
      gdFree (a);

      return NULL;
    }

  err = FT_New_Face (*b->library, fullname, 0, &a->face);
  if (err)
    {
      /* 2.0.12: TBB: free these. Thanks to Frank Faubert. */
      free (a->fontlist);
      free (fullname);
      gdFree (a);
      *error = "Could not read font";
      return NULL;
    }
  gdFree (fullname);

/* FIXME - This mapping stuff is imcomplete - where is the spec? */
/* EAM   - It's worse than that. It's pointless to match character encodings here. */
/*         As currently written, the stored a->face->charmap only matches one of   */
/*         the actual charmaps and we cannot know at this stage if it is the right */
/*         one. We should just skip all this stuff, and check in gdImageStringFTEx */
/*         if some particular charmap is preferred and if so whether it is held in */
/*         one of the a->face->charmaps[0..num_charmaps].                          */
/*         And why is it so bad not to find any recognized charmap?  The user may  */
/*         still know what mapping to use, even if we do not.  In that case we can */
/*         just use the map in a->face->charmaps[num_charmaps] and be done with it.*/

  a->have_char_map_unicode = 0;
  a->have_char_map_big5 = 0;
  a->have_char_map_sjis = 0;
  a->have_char_map_apple_roman = 0;
  for (n = 0; n < a->face->num_charmaps; n++)
    {
      charmap = a->face->charmaps[n];
      platform = charmap->platform_id;
      encoding = charmap->encoding_id;

/* EAM DEBUG - Newer versions of libfree2 make it easier 
	by defining encodings */
/* TBB: get this exactly right: 2.1.3 *or better*, all possible cases. */

#if ((defined(FREETYPE_MAJOR)) && (((FREETYPE_MAJOR == 2) && (((FREETYPE_MINOR == 1) && (FREETYPE_PATCH >= 3)) || (FREETYPE_MINOR > 1))) || (FREETYPE_MAJOR > 2)))
      if (charmap->encoding == FT_ENCODING_MS_SYMBOL
	  || charmap->encoding == FT_ENCODING_ADOBE_CUSTOM
	  || charmap->encoding == FT_ENCODING_ADOBE_STANDARD)
	{
	  a->have_char_map_unicode = 1;
	  found = charmap;
	  a->face->charmap = charmap;
	  return (void *) a;
	}
#endif /* Freetype 2.1 or better */
/* EAM DEBUG */

      if ((platform == 3 && encoding == 1)	/* Windows Unicode */
	  || (platform == 3 && encoding == 0)	/* Windows Symbol */
	  || (platform == 2 && encoding == 1)	/* ISO Unicode */
	  || (platform == 0))
	{			/* Apple Unicode */
	  a->have_char_map_unicode = 1;
	  found = charmap;
	}
      else if (platform == 3 && encoding == 4)
	{			/* Windows Big5 */
	  a->have_char_map_big5 = 1;
	  found = charmap;
	}
      else if (platform == 3 && encoding == 2)
	{			/* Windows Sjis */
	  a->have_char_map_sjis = 1;
	  found = charmap;
	}
      else if ((platform == 1 && encoding == 0)	/* Apple Roman */
	       || (platform == 2 && encoding == 0))
	{			/* ISO ASCII */
	  a->have_char_map_apple_roman = 1;
	  found = charmap;
	}
    }
  if (!found)
    {
      *error = "Unable to find a CharMap that I can handle";
      /* 2.0.12: TBB: free these. Thanks to Frank Faubert. */
      free (a->fontlist);
      gdFree (a);
      return NULL;
    }
  /* 2.0.5: we should actually return this */
  a->face->charmap = found;
  return (void *) a;
}

static void
fontRelease (void *element)
{
  font_t *a = (font_t *) element;

  FT_Done_Face (a->face);
  gdFree (a->fontlist);
  gdFree ((char *) element);
}

/********************************************************************/
/* tweencolor cache functions                                            */

static int
tweenColorTest (void *element, void *key)
{
  tweencolor_t *a = (tweencolor_t *) element;
  tweencolorkey_t *b = (tweencolorkey_t *) key;

  return (a->pixel == b->pixel
	  && a->bgcolor == b->bgcolor
	  && a->fgcolor == b->fgcolor && a->im == b->im);
}

/*
 * Computes a color in im's color table that is part way between
 * the background and foreground colors proportional to the gray
 * pixel value in the range 0-NUMCOLORS. The fg and bg colors must already
 * be in the color table for palette images. For truecolor images the
 * returned value simply has an alpha component and gdImageAlphaBlend
 * does the work so that text can be alpha blended across a complex
 * background (TBB; and for real in 2.0.2).
 */
static void *
tweenColorFetch (char **error, void *key)
{
  tweencolor_t *a;
  tweencolorkey_t *b = (tweencolorkey_t *) key;
  int pixel, npixel, bg, fg;
  gdImagePtr im;

  a = (tweencolor_t *) gdMalloc (sizeof (tweencolor_t));
  pixel = a->pixel = b->pixel;
  bg = a->bgcolor = b->bgcolor;
  fg = a->fgcolor = b->fgcolor;
  im = b->im;

  /* if fg is specified by a negative color idx, then don't antialias */
  if (fg < 0)
    {
      if ((pixel + pixel) >= NUMCOLORS)
	a->tweencolor = -fg;
      else
	a->tweencolor = bg;
    }
  else
    {
      npixel = NUMCOLORS - pixel;
      if (im->trueColor)
	{
	  /* 2.0.1: use gdImageSetPixel to do the alpha blending work,
	     or to just store the alpha level. All we have to do here
	     is incorporate our knowledge of the percentage of this
	     pixel that is really "lit" by pushing the alpha value
	     up toward transparency in edge regions. */
	  a->tweencolor = gdTrueColorAlpha (gdTrueColorGetRed (fg),
					    gdTrueColorGetGreen (fg),
					    gdTrueColorGetBlue (fg),
					    gdAlphaMax -
					    (gdTrueColorGetAlpha (fg) *
					     pixel / NUMCOLORS));
	}
      else
	{
	  a->tweencolor = gdImageColorResolve (im,
					       (pixel * im->red[fg] +
						npixel * im->red[bg]) /
					       NUMCOLORS,
					       (pixel * im->green[fg] +
						npixel * im->green[bg]) /
					       NUMCOLORS,
					       (pixel * im->blue[fg] +
						npixel * im->blue[bg]) /
					       NUMCOLORS);
	}
    }
  return (void *) a;
}

static void
tweenColorRelease (void *element)
{
  gdFree ((char *) element);
}

/* draw_bitmap - transfers glyph bitmap to GD image */
static char *
gdft_draw_bitmap (gdCache_head_t * tc_cache, gdImage * im, int fg,
		  FT_Bitmap bitmap, int pen_x, int pen_y)
{
  unsigned char *pixel = NULL;
  int *tpixel = NULL;
  int opixel;
  int x, y, row, col, pc, pcr;

  tweencolor_t *tc_elem;
  tweencolorkey_t tc_key;

  /* copy to image, mapping colors */
  tc_key.fgcolor = fg;
  tc_key.im = im;
  /* Truecolor version; does not require the cache */
  if (im->trueColor)
    {
      for (row = 0; row < bitmap.rows; row++)
	{
	  pc = row * bitmap.pitch;
	  pcr = pc;
	  y = pen_y + row;
	  /* clip if out of bounds */
	  /* 2.0.16: clipping rectangle, not image bounds */
	  if ((y > im->cy2) || (y < im->cy1))
	    continue;
	  for (col = 0; col < bitmap.width; col++, pc++)
	    {
	      int level;
	      if (bitmap.pixel_mode == ft_pixel_mode_grays)
		{
		  /*
		   * Scale to 128 levels of alpha for gd use.
		   * alpha 0 is opacity, so be sure to invert at the end
		   */
		  level = (bitmap.buffer[pc] * gdAlphaMax /
			   (bitmap.num_grays - 1));
		}
	      else if (bitmap.pixel_mode == ft_pixel_mode_mono)
		{
		  /* 2.0.5: mode_mono fix from Giuliano Pochini */
		  level =
		    ((bitmap.
		      buffer[(col >> 3) +
			     pcr]) & (1 << (~col & 0x07))) ?
		    gdAlphaTransparent : gdAlphaOpaque;
		}
	      else
		{
		  return "Unsupported ft_pixel_mode";
		}
              if (level == 0)  /* if background */
		continue;

	      if ((fg >= 0) && (im->trueColor))
		{
		  /* Consider alpha in the foreground color itself to be an
		     upper bound on how opaque things get, when truecolor is
		     available. Without truecolor this results in far too many
		     color indexes. */
		  level =
		    level * (gdAlphaMax -
			     gdTrueColorGetAlpha (fg)) / gdAlphaMax;
		}
	      level = gdAlphaMax - level;   /* inverting to get alpha */
	      x = pen_x + col;
	      /* clip if out of bounds */
	      /* 2.0.16: clip to clipping rectangle, Matt McNabb */
	      if ((x > im->cx2) || (x < im->cx1))
		continue;
	      /* get pixel location in gd buffer */
	      tpixel = &im->tpixels[y][x];
	      if (fg < 0)
		{
		  if (level < (gdAlphaMax / 2))
		    {
		      *tpixel = -fg;
		    }
		}
	      else
		{
		  if (im->alphaBlendingFlag)
		    {
		      opixel = *tpixel;
		      if (gdTrueColorGetAlpha(opixel) != gdAlphaTransparent)
			{
			  *tpixel = gdAlphaBlend (opixel,
				      (level << 24) + (fg & 0xFFFFFF));
			}
		      else
			{
			  *tpixel = (level << 24) + (fg & 0xFFFFFF);
			}
		    }
		  else
		    {
		      *tpixel = (level << 24) + (fg & 0xFFFFFF);
		    }
		}
	    }
	}
      return (char *) NULL;
    }
  /* Non-truecolor case, restored to its more or less original form */
  for (row = 0; row < bitmap.rows; row++)
    {
      int pcr;
      pc = row * bitmap.pitch;
      pcr = pc;
      if (bitmap.pixel_mode == ft_pixel_mode_mono)
	pc *= 8;		/* pc is measured in bits for monochrome images */

      y = pen_y + row;

      /* clip if out of bounds */
      if (y >= im->sy || y < 0)
	continue;

      for (col = 0; col < bitmap.width; col++, pc++)
	{
	  if (bitmap.pixel_mode == ft_pixel_mode_grays)
	    {
	      /*
	       * Round to NUMCOLORS levels of antialiasing for
	       * index color images since only 256 colors are
	       * available.
	       */
	      tc_key.pixel = ((bitmap.buffer[pc] * NUMCOLORS)
			      + bitmap.num_grays / 2)
		/ (bitmap.num_grays - 1);
	    }
	  else if (bitmap.pixel_mode == ft_pixel_mode_mono)
	    {
	      tc_key.pixel = ((bitmap.buffer[pc / 8]
			       << (pc % 8)) & 128) ? NUMCOLORS : 0;
	      /* 2.0.5: mode_mono fix from Giuliano Pochini */
	      tc_key.pixel =
		((bitmap.
		  buffer[(col >> 3) +
			 pcr]) & (1 << (~col & 0x07))) ? NUMCOLORS : 0;
	    }
	  else
	    {
	      return "Unsupported ft_pixel_mode";
	    }
	  if (tc_key.pixel == 0)	/* if background */
	    continue;

	  x = pen_x + col;

	  /* clip if out of bounds */
	  if (x >= im->sx || x < 0)
	    continue;
	  /* get pixel location in gd buffer */
	  pixel = &im->pixels[y][x];
	  if (tc_key.pixel == NUMCOLORS)
	    {
	      /* use fg color directly. gd 2.0.2: watch out for
	         negative indexes (thanks to David Marwood). */
	      *pixel = (fg < 0) ? -fg : fg;
	    }
	  else
	    {
	      /* find antialised color */

	      tc_key.bgcolor = *pixel;
	      tc_elem = (tweencolor_t *) gdCacheGet (tc_cache, &tc_key);
	      *pixel = tc_elem->tweencolor;
	    }
	}
    }
  return (char *) NULL;
}

extern int any2eucjp (char *, char *, unsigned int);

/* Persistent font cache until explicitly cleared */
/* Fonts can be used across multiple images */

/* 2.0.16: thread safety (the font cache is shared) */
gdMutexDeclare (gdFontCacheMutex);
static gdCache_head_t *fontCache;
static FT_Library library;

BGD_DECLARE(void) gdFreeFontCache ()
{
  gdFontCacheShutdown ();
}

BGD_DECLARE(void) gdFontCacheShutdown ()
{
  if (fontCache)
    {
      gdMutexShutdown (gdFontCacheMutex);
      gdCacheDelete (fontCache);
      FT_Done_FreeType (library);
      /* 2.0.16: Gustavo Scotti: make sure we don't free this twice */
      fontCache = 0;
    }
}

/********************************************************************/
/* gdImageStringFT -  render a utf8 string onto a gd image          */

BGD_DECLARE(char *) gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
		 double ptsize, double angle, int x, int y, char *string)
{
  return gdImageStringFTEx (im, brect, fg, fontlist,
			    ptsize, angle, x, y, string, 0);
}

BGD_DECLARE(int) gdFontCacheSetup (void)
{
  if (fontCache)
    {
      /* Already set up */
      return 0;
    }
  gdMutexSetup (gdFontCacheMutex);
  if (FT_Init_FreeType (&library))
    {
      gdMutexShutdown (gdFontCacheMutex);
      return -1;
    }
  fontCache = gdCacheCreate (FONTCACHESIZE, fontTest, fontFetch, fontRelease);
  return 0;
}


BGD_DECLARE(char *) gdImageStringFTEx (gdImage * im, int *brect, int fg, char *fontlist,
		   double ptsize, double angle, int x, int y, char *string,
		   gdFTStringExtraPtr strex)
{
  FT_Matrix matrix;
  FT_Vector penf, delta, total_min, total_max, glyph_min, glyph_max;
  FT_Face face;
  FT_Glyph image;
  FT_GlyphSlot slot;
  FT_Error err;
  FT_Bool use_kerning;
  FT_UInt glyph_index, previous;
  double sin_a = sin (angle);
  double cos_a = cos (angle);
  int len, i, ch;
  font_t *font;
  fontkey_t fontkey;
  char *next;
  char *tmpstr = 0;
  int render = (im && (im->trueColor || (fg <= 255 && fg >= -255)));
  FT_BitmapGlyph bm;
  /* 2.0.13: Bob Ostermann: don't force autohint, that's just for testing 
     freetype and doesn't look as good */
  int render_mode = FT_LOAD_DEFAULT;
  int m, mfound;
  /* Now tuneable thanks to Wez Furlong */
  double linespace = LINESPACE;
  /* 2.0.6: put this declaration with the other declarations! */
  /*
   *   make a new tweenColorCache on every call
   *   because caching colormappings between calls
   *   is not safe. If the im-pointer points to a
   *   brand new image, the cache gives out bogus
   *   colorindexes.          -- 27.06.2001 <krisku@arrak.fi>
   */
  gdCache_head_t *tc_cache;
  /* Tuneable horizontal and vertical resolution in dots per inch */
  int hdpi, vdpi;
  if (strex)
    {
      if ((strex->flags & gdFTEX_LINESPACE) == gdFTEX_LINESPACE)
	{
	  linespace = strex->linespacing;
	}
    }
  tc_cache = gdCacheCreate (TWEENCOLORCACHESIZE,
			    tweenColorTest, tweenColorFetch,
			    tweenColorRelease);

/***** initialize font library and font cache on first call ******/
  if (!fontCache)
    {
      if (gdFontCacheSetup () != 0)
	{
	  gdCacheDelete (tc_cache);
	  return "Failure to initialize font library";
	}
    }
/*****/
  gdMutexLock (gdFontCacheMutex);
  /* get the font (via font cache) */
  fontkey.fontlist = fontlist;
  fontkey.library = &library;
  font = (font_t *) gdCacheGet (fontCache, &fontkey);
  if (!font)
    {
      gdCacheDelete (tc_cache);
      gdMutexUnlock (gdFontCacheMutex);
      return fontCache->error;
    }
  face = font->face;		/* shortcut */
  slot = face->glyph;		/* shortcut */

  /*
   * Added hdpi and vdpi to support images at non-screen resolutions, i.e. 300 dpi TIFF,
   *    or 100h x 50v dpi FAX format. 2.0.23.
   * 2004/02/27 Mark Shackelford, mark.shackelford@acs-inc.com
   */
  hdpi = GD_RESOLUTION;
  vdpi = GD_RESOLUTION;
  if (strex && (strex->flags & gdFTEX_RESOLUTION))
    {
      hdpi = strex->hdpi;
      vdpi = strex->vdpi;
    }

  if (FT_Set_Char_Size (face, 0, (FT_F26Dot6) (ptsize * 64), hdpi, vdpi))
    {
      gdCacheDelete (tc_cache);
      gdMutexUnlock (gdFontCacheMutex);
      return "Could not set character size";
    }

  matrix.xx = (FT_Fixed) (cos_a * (1 << 16));
  matrix.yx = (FT_Fixed) (sin_a * (1 << 16));
  matrix.xy = -matrix.yx;
  matrix.yy = matrix.xx;

  use_kerning = FT_HAS_KERNING (face);
  previous = 0;
  if (fg < 0)
    {
      render_mode |= FT_LOAD_MONOCHROME;
    }
  /* 2.0.12: allow explicit specification of the preferred map;
     but we still fall back if it is not available. */
  m = gdFTEX_Unicode;
  if (strex && (strex->flags & gdFTEX_CHARMAP))
    {
      m = strex->charmap;
    }
  /* Try all three types of maps, but start with the specified one */
  mfound = 0;
  for (i = 0; (i < 3); i++)
    {
      switch (m)
	{
	case gdFTEX_Unicode:
	  if (font->have_char_map_unicode)
	    {
	      mfound = 1;
	    }
	  break;
	case gdFTEX_Shift_JIS:
	  if (font->have_char_map_sjis)
	    {
	      mfound = 1;
	    }
	  break;
	case gdFTEX_Big5:
	  {
	    /* This was the 'else' case, we can't really 'detect' it */
	    mfound = 1;
	  }
	  break;
	}
      if (mfound)
	{
	  break;
	}
      m++;
      m %= 3;
    }
  if (!mfound)
    {
      /* No character set found! */
      gdMutexUnlock (gdFontCacheMutex);
      return "No character set found";
    }

#ifndef JISX0208
  if (font->have_char_map_sjis)
    {
#endif
      if ((tmpstr = (char *) gdMalloc (BUFSIZ)))
	{
	  any2eucjp (tmpstr, string, BUFSIZ);
	  next = tmpstr;
	}
      else
	{
	  next = string;
	}
#ifndef JISX0208
    }
  else
    {
      next = string;
    }
#endif

  penf.x = penf.y = 0;	/* running position of non-rotated glyphs */

  for (i=0; *next; i++)
    {

      ch = *next;

      /* carriage returns */
      if (ch == '\r')
	{
	  penf.x = 0;
	  previous = 0;		/* clear kerning flag */
	  next++;
	  continue;
	}
      /* newlines */
      if (ch == '\n')
	{
	  /* 2.0.13: reset penf.x. Christopher J. Grayce */
	  penf.x = 0;
	  penf.y += face->size->metrics.height * linespace;
	  penf.y = (penf.y + 32) & -64;	/* round to next pixel row */
	  previous = 0;		/* clear kerning flag */
	  next++;
	  continue;
	}

/* EAM DEBUG */
/* TBB: get this exactly right: 2.1.3 *or better*, all possible cases. */
/* 2.0.24: David R. Morrison: use the more complete ifdef here. */

#if ((defined(FREETYPE_MAJOR)) && (((FREETYPE_MAJOR == 2) && (((FREETYPE_MINOR == 1) && (FREETYPE_PATCH >= 3)) || (FREETYPE_MINOR > 1))) || (FREETYPE_MAJOR > 2)))
      if (font->face->charmap->encoding == FT_ENCODING_MS_SYMBOL)
	{
	  /* I do not know the significance of the constant 0xf000. */
	  /* It was determined by inspection of the character codes */
	  /* stored in Microsoft font symbol.ttf                    */
	  len = gdTcl_UtfToUniChar (next, &ch);
	  ch |= 0xf000;
	  next += len;
	}
      else
#endif /* Freetype 2.1 or better */
/* EAM DEBUG */

	switch (m)
	  {
	  case gdFTEX_Unicode:
	    if (font->have_char_map_unicode)
	      {
		/* use UTF-8 mapping from ASCII */
		len = gdTcl_UtfToUniChar (next, &ch);
		next += len;
	      }
	    break;
	  case gdFTEX_Shift_JIS:
	    if (font->have_char_map_sjis)
	      {
		unsigned char c;
		int jiscode;
		c = *next;
		if (0xA1 <= c && c <= 0xFE)
		  {
		    next++;
		    jiscode = 0x100 * (c & 0x7F) + ((*next) & 0x7F);

		    ch = (jiscode >> 8) & 0xFF;
		    jiscode &= 0xFF;

		    if (ch & 1)
		      jiscode += 0x40 - 0x21;
		    else
		      jiscode += 0x9E - 0x21;

		    if (jiscode >= 0x7F)
		      jiscode++;
		    ch = (ch - 0x21) / 2 + 0x81;
		    if (ch >= 0xA0)
		      ch += 0x40;

		    ch = (ch << 8) + jiscode;
		  }
		else
		  {
		    ch = c & 0xFF;	/* don't extend sign */
		  }
		next++;
	      }
	    break;
	  case gdFTEX_Big5:
	    {
	      /*
	       * Big 5 mapping:
	       * use "JIS-8 half-width katakana" coding from 8-bit characters. Ref:
	       * ftp://ftp.ora.com/pub/examples/nutshell/ujip/doc/japan.inf-032092.sjs
	       */
	      ch = (*next) & 0xFF;	/* don't extend sign */
	      next++;
	      if (ch >= 161	/* first code of JIS-8 pair */
		  && *next)
		{		/* don't advance past '\0' */
		  /* TBB: Fix from Kwok Wah On: & 255 needed */
		  ch = (ch * 256) + ((*next) & 255);
		  next++;
		}
	    }
	    break;
	  }
      /* set rotation transform */
      FT_Set_Transform (face, &matrix, NULL);
      /* Convert character code to glyph index */
      glyph_index = FT_Get_Char_Index (face, ch);

      /* retrieve kerning distance and move pen position */
      if (use_kerning && previous && glyph_index)
	{
	  FT_Get_Kerning (face, previous, glyph_index,
			  ft_kerning_default, &delta);
	  /* 2.0.12: indispensable for an accurate bounding box. */
	  penf.x += delta.x;
	}

      /* load glyph image into the slot (erase previous one) */
      err = FT_Load_Glyph (face, glyph_index, render_mode);
      if (err)
	{
	  gdCacheDelete (tc_cache);
	  gdMutexUnlock (gdFontCacheMutex);
	  return "Problem loading glyph";
	}

      if (brect)
	{			/* only if need brect */

	  glyph_min.x = penf.x + slot->metrics.horiBearingX;
	  glyph_min.y = penf.y - slot->metrics.horiBearingY;

	  if (ch == ' ')        /* special case for trailing space */
            {
	      glyph_max.x = penf.x + slot->metrics.horiAdvance;
            }
          else
            {
	      glyph_max.x = glyph_min.x + slot->metrics.width;
            }
	  glyph_max.y = glyph_min.y + slot->metrics.height;

	  if (i==0)
	    {
	      total_min = glyph_min;
	      total_max = glyph_max;
	    }
	  else
	    {
              if (glyph_min.x < total_min.x)
                  total_min.x = glyph_min.x;
              if (glyph_min.y < total_min.y)
                  total_min.y = glyph_min.y;
              if (glyph_max.x > total_max.x)
                  total_max.x = glyph_max.x;
              if (glyph_max.y > total_max.y)
                  total_max.y = glyph_max.y;
	    }
	}

      if (render)
	{
          /* transform glyph image */
          FT_Get_Glyph (slot, &image);

	  if (image->format != ft_glyph_format_bitmap)
	    {
	      err = FT_Glyph_To_Bitmap (&image, ft_render_mode_normal, 0, 1);
	      if (err)
		{
		  gdCacheDelete (tc_cache);
		  gdMutexUnlock (gdFontCacheMutex);
		  return "Problem rendering glyph";
		}
	    }

	  /* now, draw to our target surface */
	  bm = (FT_BitmapGlyph) image;
	  gdft_draw_bitmap (tc_cache, im, fg, bm->bitmap,
		    x + (penf.x * cos_a + penf.y * sin_a + 32)/64 + bm->left,
		    y - (penf.x * sin_a - penf.y * cos_a - 32)/64 - bm->top);

          FT_Done_Glyph (image);
	}

      /* record current glyph index for kerning */
      previous = glyph_index;

      /* advance character position */ 
      penf.x += slot->metrics.horiAdvance;
    }

  if (brect)
    {				/* only if need brect */

      /* increase by 1 pixel to allow for rounding */
      total_min.x -= 64;
      total_min.y -= 64;
      total_max.x += 64;
      total_max.y += 64;
 
      /* rotate bounding rectangle, scale and round to int pixels, and translate */
      brect[0] = x + (total_min.x * cos_a + total_max.y * sin_a + 32)/64;
      brect[1] = y - (total_min.x * sin_a - total_max.y * cos_a + 32)/64;
      brect[2] = x + (total_max.x * cos_a + total_max.y * sin_a + 32)/64;
      brect[3] = y - (total_max.x * sin_a - total_max.y * cos_a + 32)/64;
      brect[4] = x + (total_max.x * cos_a + total_min.y * sin_a + 32)/64;
      brect[5] = y - (total_max.x * sin_a - total_min.y * cos_a + 32)/64;
      brect[6] = x + (total_min.x * cos_a + total_min.y * sin_a + 32)/64;
      brect[7] = y - (total_min.x * sin_a - total_min.y * cos_a + 32)/64;
    }

  if (tmpstr)
    gdFree (tmpstr);
  gdCacheDelete (tc_cache);
  gdMutexUnlock (gdFontCacheMutex);
  return (char *) NULL;
}

#endif /* HAVE_LIBFREETYPE */
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