t1objs.c

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

/*******************************************************************
 *
 *  t1objs.c                                                     1.0
 *
 *    Type1 Objects manager.        
 *
 *  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 <ftdebug.h>
#include <ftstream.h>

#include <t1gload.h>
#include <t1load.h>

#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
#include <t1hinter.h>
#endif

#include <psnames.h>

/* Required by tracing mode */
#undef   FT_COMPONENT
#define  FT_COMPONENT  trace_t1objs

/*******************************************************************
 *                                                                 *
 *                         SIZE  FUNCTIONS                         *
 *                                                                 *
 *                                                                 *
 *******************************************************************/

/*******************************************************************
 *
 * <Function>  T1_Done_Size
 *
 * <Description>
 *    The TrueDoc instance object destructor. Used to discard
 *    a given instance object..
 *
 * <Input>
 *    instance   :: handle to the target instance object
 *
 * <Return>
 *    TrueDoc error code. 0 means success
 *
 ******************************************************************/

  LOCAL_FUNC
  void  T1_Done_Size( T1_Size  size )
  {
    if (size)
    {
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
      T1_Done_Size_Hinter( size );
#endif
      size->valid = 0;
    }
  }


/*******************************************************************
 *
 *  <Function> T1_Init_Size
 *
 *  <Description>
 *     The instance object constructor
 *
 *  <Input>
 *     instance  : handle to new instance object
 *     face      : pointer to parent face object
 *
 *  <Return>
 *     TrueDoc error code. 0 means success.
 *
 ******************************************************************/

  LOCAL_DEF
  T1_Error  T1_Init_Size( T1_Size  size )
  {
    T1_Error    error;
      
    size->valid = 0;
    
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
    error = T1_New_Size_Hinter( size );
    return error;
#else
    (void)error;
    return T1_Err_Ok;
#endif
  }


/*******************************************************************
 *
 *  <Function> T1_Reset_Size
 *
 *  <Description>
 *     Resets an instance to a new pointsize/transform.
 *     This function is in charge of resetting the blue zones,
 *     As well as the stem snap tables for a given size..
 *
 *  <Input>
 *     instance   the instance object to destroy
 *
 *  <Output>
 *     Error code.
 *
 ******************************************************************/
 
  LOCAL_FUNC
  T1_Error  T1_Reset_Size( T1_Size  size )
  {
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
    return T1_Reset_Size_Hinter( size );
#else
    (void)size;
    return 0;
#endif
  }


/*******************************************************************
 *                                                                 *
 *                         FACE  FUNCTIONS                         *
 *                                                                 *
 *                                                                 *
 *******************************************************************/

/*******************************************************************
 *
 *  <Function> T1_Done_Face
 *
 *  <Description>
 *     The face object destructor.
 *
 *  <Input>
 *     face  :: typeless pointer to the face object to destroy
 *
 *  <Return>
 *     Error code.                       
 *
 ******************************************************************/

  LOCAL_FUNC
  void  T1_Done_Face( T1_Face  face )
  {
    FT_Memory  memory;

    if (face)
    {
      memory = face->root.memory;
      /* XXXX : TO DO */
    }
  }

/*******************************************************************
 *
 *  <Function>  T1_Init_Face
 *
 *  <Description>
 *     The face object constructor.
 *
 *  <Input>
 *     face  ::  face record to build
 *     Input ::  input stream where to load font data
 *
 *  <Return>
 *     Error code.
 *
 ******************************************************************/

  LOCAL_FUNC
  T1_Error  T1_Init_Face( FT_Stream  stream,
                          FT_Int     face_index,
                          T1_Face    face )
  {
    T1_Tokenizer        tokenizer;
    T1_Error            error;
    PSNames_Interface*  psnames;

    (void)face_index;
    (void)face;

    face->root.num_faces = 1;

    psnames = (PSNames_Interface*)face->psnames;
    if (!psnames)
    {
      /* look-up the PSNames driver */
      FT_Driver  psnames_driver;
      
      psnames_driver = FT_Get_Driver( face->root.driver->library, "psnames" );
      if (psnames_driver)
        face->psnames = (PSNames_Interface*)
                            (psnames_driver->interface.format_interface);
    }

    /* open the tokenizer, this will also check the font format */
    error = New_Tokenizer( stream, &tokenizer );
    if (error) goto Fail;

    /* if we just wanted to check the format, leave successfully now */
    if (face_index < 0)
      goto Leave;

    /* check the face index */
    if ( face_index != 0 )
    {
      FT_ERROR(( "T1.Init_Face : invalid face index\n" ));
      error = T1_Err_Invalid_Argument;
      goto Leave;
    }

    /* Now, load the font program into the face object */
    {
      T1_Parser  parser;

      Init_T1_Parser( &parser, face, tokenizer );
      error = Parse_T1_FontProgram( &parser );
      if (error) goto Leave;

      /* Init the face object fields */
      /* Now set up root face fields */
      {
        FT_Face  root  = (FT_Face)&face->root;
        T1_Font* type1 = &face->type1;
        
        root->num_glyphs   = type1->num_glyphs;
        root->num_charmaps = 1;
  
        root->face_index = face_index;
        root->face_flags = FT_FACE_FLAG_SCALABLE;
        
        root->face_flags |= FT_FACE_FLAG_HORIZONTAL;
                              
        if ( type1->is_fixed_pitch )
          root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;

        /* XXX : TO DO - add kerning with .afm support */

        /* get style name - be careful, some broken fonts only */
        /* have a /FontName dictionary entry .. !!             */
        root->family_name = type1->family_name;
        if (root->family_name)
        {
          char*  full   = type1->full_name;
          char*  family = root->family_name;
          
          while ( *family && *full == *family )
          {
            family++;
            full++;
          }
          
          root->style_name = ( *full == ' ' ? full+1 : "Regular" );
        }
        else
        {
          /* do we have a /FontName ?? */
          if (type1->font_name)
          {
            root->family_name = type1->font_name;
            root->style_name  = "Regular";
          }
        }
  
        /* no embedded bitmap support */
        root->num_fixed_sizes = 0;
        root->available_sizes = 0;
  
        root->bbox         = type1->font_bbox;
        root->units_per_EM = 1000;
        root->ascender     =  (T1_Short)type1->font_bbox.yMax;
        root->descender    = -(T1_Short)type1->font_bbox.yMin;
        root->height       = ((root->ascender + root->descender)*12)/10;
  
        /* now compute the maximum advance width */

        root->max_advance_width = type1->standard_width;

        /* compute max advance width for proportional fonts */
        if (!type1->is_fixed_pitch)
        {
          T1_Int  max_advance;

          error = T1_Compute_Max_Advance( face, &max_advance );

          /* in case of error, keep the standard width */
          if (!error)
            root->max_advance_width = max_advance;
          else
            error = 0;   /* clear error */
        }

        root->max_advance_height = root->height;
        
        root->underline_position  = type1->underline_position;
        root->underline_thickness = type1->underline_thickness;
  
        root->max_points   = 0;
        root->max_contours = 0;
      }
    }

  Leave:
    Done_Tokenizer( tokenizer );

  Fail:
    return error;
  }


/*******************************************************************
 *
 *  Function    :  Glyph_Destroy
 *
 *  Description :  The glyph object destructor.
 *
 *  Input  :  _glyph  typeless pointer to the glyph record to destroy
 *
 *  Output :  Error code.                       
 *
 ******************************************************************/

  LOCAL_FUNC
  void  T1_Done_GlyphSlot( T1_GlyphSlot  glyph )
  {
    FT_Memory  memory  = glyph->root.face->memory;
    FT_Library library = glyph->root.face->driver->library;

#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
    T1_Done_Glyph_Hinter( glyph );
#endif
	/* the bitmaps are created on demand */
	FREE( glyph->root.bitmap.buffer );
    FT_Outline_Done( library, &glyph->root.outline );
    return;
  }


/*******************************************************************
 *
 *  Function    :  Glyph_Create
 *
 *  Description :  The glyph object constructor.
 *
 *  Input  :  glyph   glyph record to build.
 *            face    the glyph's parent face.              
 *
 *  Output :  Error code.
 *
 ******************************************************************/

  LOCAL_FUNC
  T1_Error  T1_Init_GlyphSlot( T1_GlyphSlot  glyph )
  {
    FT_Library  library = glyph->root.face->driver->library;
    T1_Error    error;

    glyph->max_points         = 0;
    glyph->max_contours       = 0;
    glyph->root.bitmap.buffer = 0;

    error = FT_Outline_New( library, 0, 0, &glyph->root.outline );
    if (error) return error;

#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
    error = T1_New_Glyph_Hinter( glyph );
    if (error)
      FT_Outline_Done( library, &glyph->root.outline );
#endif

    return error;
  }


/*******************************************************************
 *
 *  <Function>  T1_Init_Driver
 *
 *  <Description>
 *     Initialise a given Type 1 driver object
 *
 *  <Input>
 *     driver ::  handle to target driver object
 *
 *  <Return>
 *     Error code.
 *
 ******************************************************************/

  LOCAL_FUNC
  T1_Error  T1_Init_Driver( T1_Driver  driver )
  {
    (void)driver;
    return T1_Err_Ok;
  }



/*******************************************************************
 *
 *  <Function> T1_Done_Driver
 *
 *  <Description>
 *     finalise a given Type 1 driver
 *
 *  <Input>
 *     driver  :: handle to target Type 1 driver
 *
 ******************************************************************/

  LOCAL_DEF
  void  T1_Done_Driver( T1_Driver  driver )
  {
    (void)driver;
  }


/* END */