ftbase.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

        if (stream->read( stream, stream->pos, reads, 3L ) != 3L )
          goto Fail;

        p = reads;
      }
      else
      {
        p = stream->base + stream->pos;
      }

      if ( p )
        result = FT_NEXT_OFF3( p );
    }
    else
      goto Fail;

    stream->pos += 3;

    return result;

  Fail:
    *error = FT_Err_Invalid_Stream_Operation;
    FT_ERROR(( "FT_Stream_ReadOffset:" ));
    FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
               stream->pos, stream->size ));

    return 0;
  }


  FT_BASE_DEF( FT_Long )
  FT_Stream_ReadLong( FT_Stream  stream,
                      FT_Error*  error )
  {
    FT_Byte   reads[4];
    FT_Byte*  p = 0;
    FT_Long   result = 0;


    FT_ASSERT( stream );

    *error = FT_Err_Ok;

    if ( stream->pos + 3 < stream->size )
    {
      if ( stream->read )
      {
        if ( stream->read( stream, stream->pos, reads, 4L ) != 4L )
          goto Fail;

        p = reads;
      }
      else
      {
        p = stream->base + stream->pos;
      }

      if ( p )
        result = FT_NEXT_LONG( p );
    }
    else
      goto Fail;

    stream->pos += 4;

    return result;

  Fail:
    FT_ERROR(( "FT_Stream_ReadLong: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
               stream->pos, stream->size ));
    *error = FT_Err_Invalid_Stream_Operation;

    return 0;
  }


  FT_BASE_DEF( FT_Long )
  FT_Stream_ReadLongLE( FT_Stream  stream,
                        FT_Error*  error )
  {
    FT_Byte   reads[4];
    FT_Byte*  p = 0;
    FT_Long   result = 0;


    FT_ASSERT( stream );

    *error = FT_Err_Ok;

    if ( stream->pos + 3 < stream->size )
    {
      if ( stream->read )
      {
        if ( stream->read( stream, stream->pos, reads, 4L ) != 4L )
          goto Fail;

        p = reads;
      }
      else
      {
        p = stream->base + stream->pos;
      }

      if ( p )
        result = FT_NEXT_LONG_LE( p );
    }
    else
      goto Fail;

    stream->pos += 4;

    return result;

  Fail:
    FT_ERROR(( "FT_Stream_ReadLongLE:" ));
    FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
               stream->pos, stream->size ));
    *error = FT_Err_Invalid_Stream_Operation;

    return 0;
  }


  FT_BASE_DEF( FT_Error )
  FT_Stream_ReadFields( FT_Stream              stream,
                        const FT_Frame_Field*  fields,
                        void*                  structure )
  {
    FT_Error  error;
    FT_Bool   frame_accessed = 0;
    FT_Byte*  cursor = stream->cursor;


    if ( !fields || !stream )
      return FT_Err_Invalid_Argument;

    error = FT_Err_Ok;
    do
    {
      FT_ULong  value;
      FT_Int    sign_shift;
      FT_Byte*  p;


      switch ( fields->value )
      {
      case ft_frame_start:  /* access a new frame */
        error = FT_Stream_EnterFrame( stream, fields->offset );
        if ( error )
          goto Exit;

        frame_accessed = 1;
        cursor         = stream->cursor;
        fields++;
        continue;  /* loop! */

      case ft_frame_bytes:  /* read a byte sequence */
      case ft_frame_skip:   /* skip some bytes      */
        {
          FT_UInt  len = fields->size;


          if ( cursor + len > stream->limit )
          {
            error = FT_Err_Invalid_Stream_Operation;
            goto Exit;
          }

          if ( fields->value == ft_frame_bytes )
          {
            p = (FT_Byte*)structure + fields->offset;
            FT_MEM_COPY( p, cursor, len );
          }
          cursor += len;
          fields++;
          continue;
        }

      case ft_frame_byte:
      case ft_frame_schar:  /* read a single byte */
        value = FT_NEXT_BYTE(cursor);
        sign_shift = 24;
        break;

      case ft_frame_short_be:
      case ft_frame_ushort_be:  /* read a 2-byte big-endian short */
        value = FT_NEXT_USHORT(cursor);
        sign_shift = 16;
        break;

      case ft_frame_short_le:
      case ft_frame_ushort_le:  /* read a 2-byte little-endian short */
        value = FT_NEXT_USHORT_LE(cursor);
        sign_shift = 16;
        break;

      case ft_frame_long_be:
      case ft_frame_ulong_be:  /* read a 4-byte big-endian long */
        value = FT_NEXT_ULONG(cursor);
        sign_shift = 0;
        break;

      case ft_frame_long_le:
      case ft_frame_ulong_le:  /* read a 4-byte little-endian long */
        value = FT_NEXT_ULONG_LE(cursor);
        sign_shift = 0;
        break;

      case ft_frame_off3_be:
      case ft_frame_uoff3_be:  /* read a 3-byte big-endian long */
        value = FT_NEXT_UOFF3(cursor);
        sign_shift = 8;
        break;

      case ft_frame_off3_le:
      case ft_frame_uoff3_le:  /* read a 3-byte little-endian long */
        value = FT_NEXT_UOFF3_LE(cursor);
        sign_shift = 8;
        break;

      default:
        /* otherwise, exit the loop */
        stream->cursor = cursor;
        goto Exit;
      }

      /* now, compute the signed value is necessary */
      if ( fields->value & FT_FRAME_OP_SIGNED )
        value = (FT_ULong)( (FT_Int32)( value << sign_shift ) >> sign_shift );

      /* finally, store the value in the object */

      p = (FT_Byte*)structure + fields->offset;
      switch ( fields->size )
      {
      case (8 / FT_CHAR_BIT):
        *(FT_Byte*)p = (FT_Byte)value;
        break;

      case (16 / FT_CHAR_BIT):
        *(FT_UShort*)p = (FT_UShort)value;
        break;

      case (32 / FT_CHAR_BIT):
        *(FT_UInt32*)p = (FT_UInt32)value;
        break;

      default:  /* for 64-bit systems */
        *(FT_ULong*)p = (FT_ULong)value;
      }

      /* go to next field */
      fields++;
    }
    while ( 1 );

  Exit:
    /* close the frame if it was opened by this read */
    if ( frame_accessed )
      FT_Stream_ExitFrame( stream );

    return error;
  }


/* END */

/***************************************************************************/
/*                                                                         */
/*  ftcalc.c                                                               */
/*                                                                         */
/*    Arithmetic computations (body).                                      */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 by                   */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* Support for 1-complement arithmetic has been totally dropped in this  */
  /* release.  You can still write your own code if you need it.           */
  /*                                                                       */
  /*************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* Implementing basic computation routines.                              */
  /*                                                                       */
  /* FT_MulDiv(), FT_MulFix(), FT_DivFix(), FT_RoundFix(), FT_CeilFix(),   */
  /* and FT_FloorFix() are declared in freetype.h.                         */
  /*                                                                       */
  /*************************************************************************/


#include "ft2build.h"
#include FT_INTERNAL_CALC_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_OBJECTS_H


/* we need to define a 64-bits data type here */

#ifdef FT_LONG64

  typedef FT_INT64  FT_Int64;

#else

  typedef struct  FT_Int64_
  {
    FT_UInt32  lo;
    FT_UInt32  hi;

  } FT_Int64;

#endif /* FT_LONG64 */


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_calc


  /* The following three functions are available regardless of whether */
  /* FT_LONG64 is defined.                                             */

  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Fixed )
  FT_RoundFix( FT_Fixed  a )
  {
    return ( a >= 0 ) ?   ( a + 0x8000L ) & ~0xFFFFL
                      : -((-a + 0x8000L ) & ~0xFFFFL );
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Fixed )
  FT_CeilFix( FT_Fixed  a )
  {
    return ( a >= 0 ) ?   ( a + 0xFFFFL ) & ~0xFFFFL
                      : -((-a + 0xFFFFL ) & ~0xFFFFL );
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Fixed )
  FT_FloorFix( FT_Fixed  a )
  {
    return ( a >= 0 ) ?   a & ~0xFFFFL
                      : -((-a) & ~0xFFFFL );
  }


#ifdef FT_CONFIG_OPTION_OLD_INTERNALS

  /* documentation is in ftcalc.h */

  FT_EXPORT_DEF( FT_Int32 )
  FT_Sqrt32( FT_Int32  x )
  {
    FT_ULong  val, root, newroot, mask;


    root = 0;
    mask = 0x40000000L;
    val  = (FT_ULong)x;

    do
    {
      newroot = root + mask;
      if ( newroot <= val )
      {
        val -= newroot;
        root = newroot + mask;
      }

      root >>= 1;
      mask >>= 2;

    } while ( mask != 0 );

    return root;
  }

#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */


#ifdef FT_LONG64


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Long )
  FT_MulDiv( FT_Long  a,
             FT_Long  b,
             FT_Long  c )
  {
    FT_Int   s;
    FT_Long  d;


    s = 1;
    if ( a < 0 ) { a = -a; s = -1; }
    if ( b < 0 ) { b = -b; s = -s; }
    if ( c < 0 ) { c = -c; s = -s; }

    d = (FT_Long)( c > 0 ? ( (FT_Int64)a * b + ( c >> 1 ) ) / c
                         : 0x7FFFFFFFL );

    return ( s > 0 ) ? d : -d;
  }


#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER

  /* documentation is in ftcalc.h */

  FT_BASE_DEF( FT_Long )
  FT_MulDiv_No_Round( FT_Long  a,
                      FT_Long  b,
                      FT_Long  c )
  {
    FT_Int   s;
    FT_Long  d;


    s = 1;
    if ( a < 0 ) { a = -a; s = -1; }
    if ( b < 0 ) { b = -b; s = -s; }
    if ( c < 0 ) { c = -c; s = -s; }

    d = (FT_Long)( c > 0 ? (FT_Int64)a * b / c
                         : 0x7FFFFFFFL );

    return ( s > 0 ) ? d : -d;
  }

#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Long )
  FT_MulFix( FT_Long  a,
             FT_Long  b )
  {
    FT_Int   s = 1;
    FT_Long  c;


    if ( a < 0 ) { a = -a; s = -1; }
    if ( b < 0 ) { b = -b; s = -s; }

    c = (FT_Long)( ( (FT_Int64)a * b + 0x8000L ) >> 16 );
    return ( s > 0 ) ? c : -c ;
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Long )
  FT_DivFix( FT_Long  a,
             FT_Long  b )
  {
    FT_Int32   s;
    FT_UInt32  q;

    s = 1;
    if ( a < 0 ) { a = -a; s = -1; }
    if ( b < 0 ) { b = -b; s = -s; }

    if ( b == 0 )
      /* check for division by 0 */
      q = 0x7FFFFFFFL;
    else
      /* compute result directly */
      q = (FT_UInt32)( ( ( (FT_Int64)a << 16 ) + ( b >> 1 ) ) / b );

    return ( s < 0 ? -(FT_Long)q : (FT_Long)q );
  }


#else /* FT_LONG64 */


  static void
  ft_multo64( FT_UInt32  x,
              FT_UInt32  y,
              FT_Int64  *z )
  {
    FT_UInt32  lo1, hi1, lo2, hi2, lo, hi, i1, i2;


    lo