/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: ttload.c 8022 2007-06-05 22:23:38Z giles $ */

/* Changes after FreeType: cut out the TrueType instruction interpreter. */

/*******************************************************************
 *
 *  ttload.c                                                    1.0
 *
 *    TrueType Tables Loader.                          
 *
 *  Copyright 1996-1998 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.
 *
 ******************************************************************/

#include "ttmisc.h"

#include "ttfoutl.h"
#include "tttypes.h"
#include "ttcalc.h"
#include "ttobjs.h"
#include "ttload.h"
#include "ttfinp.h"

#ifdef DEBUG
#  define DebugTrace( font, fmt )  (void)(!font->DebugPrint ? 0 : font->DebugPrint(font, fmt))
#  define DebugTrace1( font, fmt, x)  (void)(!font->DebugPrint ? 0 : font->DebugPrint(font, fmt, x))
#else
#  define DebugTrace( font, fmt )
#  define DebugTrace1( font, fmt, x)
#endif

/*******************************************************************
 *
 *  Function    :  Load_TrueType_MaxProfile
 *
 *  Description :  Loads the maxp table into face table.
 *
 *  Input  :  face     face table to look for
 *
 *  Output :  Error code.
 *
 ******************************************************************/

  TT_Error  Load_TrueType_MaxProfile( PFace  face )
  {
    ttfReader *r = face->r;
    ttfFont *font = face->font;
    PMaxProfile  maxProfile = &face->maxProfile;

    r->Seek(r, font->t_maxp.nPos);

    DebugTrace(font, "MaxProfile " );

    /* read frame data into face table */
    maxProfile->version               = GET_ULong();

    maxProfile->numGlyphs             = GET_UShort();

    maxProfile->maxPoints             = GET_UShort();
    maxProfile->maxContours           = GET_UShort();
    maxProfile->maxCompositePoints    = GET_UShort();
    maxProfile->maxCompositeContours  = GET_UShort();

    maxProfile->maxZones              = GET_UShort();
    maxProfile->maxTwilightPoints     = GET_UShort();

    maxProfile->maxStorage            = GET_UShort();
    maxProfile->maxFunctionDefs       = GET_UShort();
    maxProfile->maxInstructionDefs    = GET_UShort();
    maxProfile->maxStackElements      = GET_UShort();
    maxProfile->maxSizeOfInstructions = GET_UShort();
    maxProfile->maxComponentElements  = GET_UShort();
    maxProfile->maxComponentDepth     = GET_UShort();

    face->numGlyphs     = maxProfile->numGlyphs;

    face->maxPoints     = MAX( maxProfile->maxCompositePoints, 
                               maxProfile->maxPoints );
    face->maxContours   = MAX( maxProfile->maxCompositeContours,
                               maxProfile->maxContours );
    face->maxComponents = maxProfile->maxComponentElements +
                          maxProfile->maxComponentDepth;

    DebugTrace(font, "loaded\n");
  
    return TT_Err_Ok;
  }

/*******************************************************************
 *
 *  Function    :  Load_TrueType_CVT
 *
 *  Description :  Loads cvt table into resident table.
 *
 *  Input  :  face     face table to look for
 *
 *  Output :  Error code.
 *
 ******************************************************************/

  TT_Error  Load_TrueType_CVT( PFace  face )
  {
    long  n;
    Int  limit;

    ttfReader *r = face->r;
    ttfFont *font = face->font;
    ttfMemory *mem = font->tti->ttf_memory;
    r->Seek(r, font->t_cvt_.nPos);


    face->cvt=NULL;

    DebugTrace(font, "CVT ");

    face->cvtSize = font->t_cvt_.nLen / 2;

#   if 0
    if(face->cvtSize < 300)
      face->cvtSize = 300; /* Work around DynaLab bug in DingBat1. */
#   endif

    if(face->cvtSize > 0) {  /* allow fonts with a CVT table */
	face->cvt = mem->alloc_bytes(mem, face->cvtSize * sizeof(Short), "Load_TrueType_CVT");
	if (!face->cvt)
	    return TT_Err_Out_Of_Memory;
    }


    limit = face->cvtSize;

    for ( n = 0; n < limit && !r->Eof(r); n++ )
      face->cvt[n] = GET_Short();

    DebugTrace(font, "loaded\n");

    return TT_Err_Ok;
  }


/*******************************************************************
 *
 *  Function    :  Load_TrueType_Programs
 *
 *  Description :  Loads the font (fpgm) and cvt programs into the
 *                 face table.
 *
 *  Input  :  face
 *
 *  Output :  Error code.
 *
 ******************************************************************/

  TT_Error  Load_TrueType_Programs( PFace  face )
  {
    ttfReader *r = face->r;
    ttfFont *font = face->font;
    ttfMemory *mem = font->tti->ttf_memory;

    face->fontProgram = NULL;
    face->cvtProgram = NULL;


    DebugTrace(font, "Font program ");

    /* The font program is optional */
    if(!font->t_fpgm.nPos)
    {
      face->fontProgram = (Byte*)NULL;
      face->fontPgmSize = 0;

      DebugTrace(font, "is absent.\n");
    }
    else
    {
      face->fontPgmSize = font->t_fpgm.nLen;
      r->Seek(r, font->t_fpgm.nPos);
      face->fontProgram = mem->alloc_bytes(mem, face->fontPgmSize, "Load_TrueType_Programs");

      if (!face->fontProgram)
        return TT_Err_Out_Of_Memory;
      r->Read(r, face->fontProgram,face->fontPgmSize );
      DebugTrace1(font, "loaded, %12d bytes\n", face->fontPgmSize);
    }

    DebugTrace(font, "Prep program ");

    if (!font->t_prep.nPos)
    {
      face->cvtProgram = (Byte*)NULL;
      face->cvtPgmSize = 0;

      DebugTrace(font, "is missing!\n");
    }
    else
    { face->cvtPgmSize=font->t_prep.nLen;
      r->Seek(r, font->t_prep.nPos);
      face->cvtProgram = mem->alloc_bytes(mem, face->cvtPgmSize, "Load_TrueType_Programs");
      if (!face->cvtProgram)
        return TT_Err_Out_Of_Memory;
      r->Read(r, face->cvtProgram,face->cvtPgmSize );
      DebugTrace1(font, "loaded, %12d bytes\n", face->cvtPgmSize );
    }

    return TT_Err_Ok;
  }



