Source

libgd 2.0 / gdft.c

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/********************************************/
/* gd interface to freetype library         */
/*                                          */
/* John Ellson   ellson@lucent.com          */
/********************************************/

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

#ifndef MSWIN32
#include <unistd.h>
#else
#define R_OK 2
#endif

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

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

#ifndef HAVE_LIBFREETYPE
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"
#include "freetype/freetype.h"
#include "freetype/ftglyph.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.
 */
#define LISTSEPARATOR " "

/*
 * DEFAULT_FONTPATH and PATHSEPARATOR are host type dependent and
 * are normally set by configure in gvconfig.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
#define DEFAULT_FONTPATH "/usr/share/fonts/truetype"
#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

#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;

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

      byte = *((unsigned char *) (str + 1));
      if (byte == '#')
	{
	  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;
	    }
	}
    }

  /*
   * 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, *fontpath, *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;
  path = strdup (fontsearchpath);
  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))
    {

      /*
       * Allocate an oversized buffer that is guaranteed to be
       * big enough for all paths to be tested.
       */
      fullname = gdRealloc (fullname,
			    strlen (fontsearchpath) + strlen (name) + 6);
      /* if name is an absolute filename then test directly */
      if (*name == '/')
	{
	  sprintf (fullname, "%s", name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      break;
	    }
	}
      for (dir = strtok (path, PATHSEPARATOR); dir;
	   dir = strtok (0, PATHSEPARATOR))
	{
	  sprintf (fullname, "%s/%s.ttf", dir, name);
	  if (access (fullname, R_OK) == 0)
	    {
	      font_found++;
	      break;
	    }
	}
      if (font_found)
	break;
    }
  gdFree (path);
  gdFree (fontlist);
  if (!font_found)
    {
      *error = "Could not find/open font";
      return NULL;
    }

  err = FT_New_Face (*b->library, fullname, 0, &a->face);
  if (err)
    {
      *error = "Could not read font";
      return NULL;
    }
  gdFree (fullname);

/* FIXME - This mapping stuff is imcomplete - where is the spec? */

  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;
      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";
      return NULL;
    }

  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.
 */
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)
    {
      a->tweencolor = -fg;
    }
  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 (gdImage * im, int fg, FT_Bitmap bitmap, int pen_x, int pen_y)
{
  unsigned char *pixel;
  int *tpixel;
  int x, y, row, col, pc;

  tweencolor_t *tc_elem;
  tweencolorkey_t tc_key;

  /* initialize tweenColorCache on first call */
  static gdCache_head_t *tc_cache;

  if (!tc_cache)
    {
      tc_cache = gdCacheCreate (TWEENCOLORCACHESIZE,
			tweenColorTest, tweenColorFetch, tweenColorRelease);
    }

  /* copy to image, mapping colors */
  tc_key.fgcolor = fg;
  tc_key.im = im;
  for (row = 0; row < bitmap.rows; row++)
    {
      pc = row * bitmap.pitch;
      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;
	    }
	  else
	    {
	      return "Unsupported ft_pixel_mode";
	    }

	  if (tc_key.pixel > 0)
	    {			/* if not background */
	      x = pen_x + col;

	      /* clip if out of bounds */
	      if (x >= im->sx || x < 0)
		continue;
	      /* get pixel location in gd buffer */
	      if (im->trueColor)
		{
		  tpixel = &im->tpixels[y][x];
		}
	      else
		{
		  pixel = &im->pixels[y][x];
		}
	      if (tc_key.pixel == NUMCOLORS)
		{
		  /* use fg color directly */
		  if (im->trueColor)
		    {
		      *tpixel = fg;
		    }
		  else
		    {
		      *pixel = fg;
		    }
		}
	      else
		{
		  /* find antialised color */
		  if (im->trueColor)
		    {
		      tc_key.bgcolor = *tpixel;
		    }
		  else
		    {
		      tc_key.bgcolor = *pixel;
		    }
		  tc_elem = (tweencolor_t *) gdCacheGet (
							  tc_cache, &tc_key);
		  if (im->trueColor)
		    {
		      *tpixel = tc_elem->tweencolor;
		    }
		  else
		    {
		      *pixel = tc_elem->tweencolor;
		    }
		}
	    }
	}
    }
  return (char *) NULL;
}

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

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

char *
gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
		 double ptsize, double angle, int x, int y, char *string)
{
  FT_BBox bbox, glyph_bbox;
  FT_Matrix matrix;
  FT_Vector pen, delta, penf;
  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 = 0, ch;
  int x1 = 0, y1 = 0;
  font_t *font;
  fontkey_t fontkey;
  char *next;
  char *tmpstr = 0;
  int render = (im && (im->trueColor || (fg <= 255 && fg >= -255)));
  FT_BitmapGlyph bm;

/***** initialize font library and font cache on first call ******/
  static gdCache_head_t *fontCache;
  static FT_Library library;

  if (!fontCache)
    {
      if (FT_Init_FreeType (&library))
	{
	  return "Failure to initialize font library";
	}
      fontCache = gdCacheCreate (FONTCACHESIZE,
				 fontTest, fontFetch, fontRelease);
    }
/*****/

  /* get the font (via font cache) */
  fontkey.fontlist = fontlist;
  fontkey.library = &library;
  font = (font_t *) gdCacheGet (fontCache, &fontkey);
  if (!font)
    {
      return fontCache->error;
    }
  face = font->face;		/* shortcut */
  slot = face->glyph;		/* shortcut */

  if (FT_Set_Char_Size (face, 0, (FT_F26Dot6) (ptsize * 64),
			GD_RESOLUTION, GD_RESOLUTION))
    {
      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;

  penf.x = penf.y = 0;		/* running position of non-rotated string */
  pen.x = pen.y = 0;		/* running position of rotated string */
  bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0;

  use_kerning = FT_HAS_KERNING (face);
  previous = 0;

#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
  while (*next)
    {
      ch = *next;

      /* carriage returns */
      if (ch == '\r')
	{
	  penf.x = 0;
	  x1 = (penf.x * cos_a - penf.y * sin_a + 32) / 64;
	  y1 = (penf.x * sin_a + penf.y * cos_a + 32) / 64;
	  pen.x = pen.y = 0;
	  previous = 0;		/* clear kerning flag */
	  next++;
	  continue;
	}
      /* newlines */
      if (ch == '\n')
	{
	  penf.y -= face->size->metrics.height * LINESPACE;
	  penf.y = (penf.y - 32) & -64;		/* round to next pixel row */
	  x1 = (penf.x * cos_a - penf.y * sin_a + 32) / 64;
	  y1 = (penf.x * sin_a + penf.y * cos_a + 32) / 64;
	  pen.x = pen.y = 0;
	  previous = 0;		/* clear kerning flag */
	  next++;
	  continue;
	}

      if (font->have_char_map_unicode)
	{
	  /* use UTF-8 mapping from ASCII */
	  len = gdTcl_UtfToUniChar (next, &ch);
	  next += len;
	}
      else 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++;
	}
      else
	{
	  /*
	   * 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++;
	    }
	}

      /* 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);
	  pen.x += delta.x;
	}

      /* load glyph image into the slot (erase previous one) */
      err = FT_Load_Glyph (face, glyph_index, FT_LOAD_DEFAULT);
      if (err)
	return "Problem loading glyph";

      /* transform glyph image */
      FT_Get_Glyph (slot, &image);
      if (brect)
	{			/* only if need brect */
	  FT_Glyph_Get_CBox (image, ft_glyph_bbox_gridfit, &glyph_bbox);
	  if (!i)
	    {			/* if first character, init BB corner values */
	      bbox.xMin = bbox.yMin = (1 << 30) - 1;
	      bbox.xMax = bbox.yMax = -bbox.xMin;
	    }
	  glyph_bbox.xMin += penf.x;
	  glyph_bbox.yMin += penf.y;
	  glyph_bbox.xMax += penf.x;
	  glyph_bbox.yMax += penf.y;
	  if (bbox.xMin > glyph_bbox.xMin)
	    bbox.xMin = glyph_bbox.xMin;
	  if (bbox.yMin > glyph_bbox.yMin)
	    bbox.yMin = glyph_bbox.yMin;
	  if (bbox.xMax < glyph_bbox.xMax)
	    bbox.xMax = glyph_bbox.xMax;
	  if (bbox.yMax < glyph_bbox.yMax)
	    bbox.yMax = glyph_bbox.yMax;
	  i++;
	}

      /* transform glyph image */
      FT_Glyph_Transform (image, &matrix, 0);

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

	  /* now, draw to our target surface */
	  bm = (FT_BitmapGlyph) image;
	  gdft_draw_bitmap (im, fg, bm->bitmap,
			    x + x1 + ((pen.x + 31) >> 6) + bm->left,
			    y - y1 + ((pen.y + 31) >> 6) - bm->top);
	}

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

      /* increment pen position */
      pen.x += image->advance.x >> 10;
      pen.y -= image->advance.y >> 10;

      penf.x += slot->metrics.horiAdvance;

      FT_Done_Glyph (image);
    }

  if (brect)
    {				/* only if need brect */
      /* For perfect rounding, must get sin(a + pi/4) and sin(a - pi/4). */
      double d1 = sin (angle + 0.78539816339744830962);
      double d2 = sin (angle - 0.78539816339744830962);

      /* rotate bounding rectangle */
      brect[0] = (int) (bbox.xMin * cos_a - bbox.yMin * sin_a);
      brect[1] = (int) (bbox.xMin * sin_a + bbox.yMin * cos_a);
      brect[2] = (int) (bbox.xMax * cos_a - bbox.yMin * sin_a);
      brect[3] = (int) (bbox.xMax * sin_a + bbox.yMin * cos_a);
      brect[4] = (int) (bbox.xMax * cos_a - bbox.yMax * sin_a);
      brect[5] = (int) (bbox.xMax * sin_a + bbox.yMax * cos_a);
      brect[6] = (int) (bbox.xMin * cos_a - bbox.yMax * sin_a);
      brect[7] = (int) (bbox.xMin * sin_a + bbox.yMax * cos_a);

      /* scale, round and offset brect */
      brect[0] = x + gdroundupdown (brect[0], d2 > 0);
      brect[1] = y - gdroundupdown (brect[1], d1 < 0);
      brect[2] = x + gdroundupdown (brect[2], d1 > 0);
      brect[3] = y - gdroundupdown (brect[3], d2 > 0);
      brect[4] = x + gdroundupdown (brect[4], d2 < 0);
      brect[5] = y - gdroundupdown (brect[5], d1 > 0);
      brect[6] = x + gdroundupdown (brect[6], d1 < 0);
      brect[7] = y - gdroundupdown (brect[7], d2 < 0);
    }

  if (tmpstr)
    gdFree (tmpstr);
  return (char *) NULL;
}

int
gdroundupdown (FT_F26Dot6 v1, int updown)
{
  return (!updown)
    ? (v1 < 0 ? ((v1 - 63) >> 6) : v1 >> 6)
    : (v1 > 0 ? ((v1 + 63) >> 6) : v1 >> 6);
}

#endif /* HAVE_LIBFREETYPE */