cffparse.h

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Author : Dave Arnold
Date : 2016-12-15 21:56:44
Hash : edf40148
Message : [cff] Implement CFF2 support (2/2). The font variation code. All parts dependent on the GX code in the `truetype' module are guarded with TT_CONFIG_OPTION_GX_VAR_SUPPORT. In other words, you can still compile the `cff' module without defining TT_CONFIG_OPTION_GX_VAR_SUPPORT (which brings you CFF2 support without font variation). * src/cff/cf2font.c (cf2_font_setup): Add support for font variation. * src/cff/cf2font.h (CF2_Font): Add fields for variation data. * src/cff/cf2ft.c (cf2_free_instance): Free blend data. (cf2_getVStore, cf2_getNormalizedVector): New functions. * src/cff/cf2ft.h: Updated. * src/cff/cf2intrp.c: Include `cffload.h'. (cf2_cmdRESERVED_15, cf2_cmdRESERVED_16): Replace with... (cf2_cmdVSINDEX, cf2_cmdBLEND): ... this new enum values. (cf2_doBlend): New function. (cf2_interpT2CharString): Handle `vsindex' and `blend' opcodes. * src/cff/cffload.c (FT_fdot14ToFixed): New macro. (cff_vstore_done, cff_vstore_load): New functions. (cff_blend_clear, cff_blend_doBlend, cff_blend_build_vector, cff_blend_check_vector): New functions. (cff_load_private_dict): Add arguments for blend vector. Handle blend data. (cff_subfont_load, cff_subfont_done): Updated. (cff_font_load): Handle CFF2 variation store data. (cff_font_done): Updated. * src/cff/cffload.h: Include `cffparse.h'. Updated. * src/cff/cffobjs.c (cff_face_done): Updated. * src/cff/cffparse.c: Include `cffload.h'. (cff_parse_num): Handle internal value 255. (cff_parse_vsindex, cff_parse_blend): New functions. (CFF_FIELD_BLEND): New macro. (cff_parser_run): Updated. * src/cff/cffparse.h (cff_kind_blend): New enum value. * src/cff/cfftoken.h: Handle `vstore', `vsindex', and `blend' dictionary values. * src/cff/cfftypes.h (CFF_VarData, CFF_AxisCoords, CFF_VarRegion, CFF_VStore, CFF_Blend): New structures. (CFF_FontRecDict): Add `vstore_offset' field. (CFF_Private): Add `vsindex' field. (CFF_SubFont): Add fields for blend data. (CFF_Font): Add `vstore' field. * src/truetype/ttgxvar.c (TT_Get_MM_Var): `CFF2' is equal to `gvar', since glyph variation data is directly embedded. (TT_Set_MM_Blend): Don't load `gvar' table for CFF2 fonts.

src/cff/cffparse.h

/***************************************************************************/
/*                                                                         */
/*  cffparse.h                                                             */
/*                                                                         */
/*    CFF token stream parser (specification)                              */
/*                                                                         */
/*  Copyright 1996-2016 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.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef CFFPARSE_H_
#define CFFPARSE_H_


#include <ft2build.h>
#include "cfftypes.h"
#include FT_INTERNAL_OBJECTS_H


FT_BEGIN_HEADER


  /* CFF uses constant parser stack size; */
  /* CFF2 can increase from default 193   */
#define CFF_MAX_STACK_DEPTH  96
#define CFF2_MAX_STACK      513
#define CFF2_DEFAULT_STACK  193

#define CFF_CODE_TOPDICT    0x1000
#define CFF_CODE_PRIVATE    0x2000
#define CFF2_CODE_TOPDICT   0x3000
#define CFF2_CODE_FONTDICT  0x4000
#define CFF2_CODE_PRIVATE   0x5000


  typedef struct  CFF_ParserRec_
  {
    FT_Library  library;
    FT_Byte*    start;
    FT_Byte*    limit;
    FT_Byte*    cursor;

    FT_Byte**   stack;
    FT_Byte**   top;
    FT_UInt     stackSize;  /* allocated size */

    FT_UInt     object_code;
    void*       object;

    FT_UShort   num_designs; /* a copy of `CFF_FontRecDict->num_designs' */
    FT_UShort   num_axes;    /* a copy of `CFF_FontRecDict->num_axes'    */

  } CFF_ParserRec, *CFF_Parser;


  FT_LOCAL( FT_Long )
  cff_parse_num( CFF_Parser  parser,
                 FT_Byte**   d );

  FT_LOCAL( FT_Error )
  cff_parser_init( CFF_Parser  parser,
                   FT_UInt     code,
                   void*       object,
                   FT_Library  library,
                   FT_UInt     stackSize,
                   FT_UShort   num_designs,
                   FT_UShort   num_axes );

  FT_LOCAL( void )
  cff_parser_done( CFF_Parser  parser );

  FT_LOCAL( FT_Error )
  cff_parser_run( CFF_Parser  parser,
                  FT_Byte*    start,
                  FT_Byte*    limit );


  enum
  {
    cff_kind_none = 0,
    cff_kind_num,
    cff_kind_fixed,
    cff_kind_fixed_thousand,
    cff_kind_string,
    cff_kind_bool,
    cff_kind_delta,
    cff_kind_callback,
    cff_kind_blend,

    cff_kind_max  /* do not remove */
  };


  /* now generate handlers for the most simple fields */
  typedef FT_Error  (*CFF_Field_Reader)( CFF_Parser  parser );

  typedef struct  CFF_Field_Handler_
  {
    int               kind;
    int               code;
    FT_UInt           offset;
    FT_Byte           size;
    CFF_Field_Reader  reader;
    FT_UInt           array_max;
    FT_UInt           count_offset;

#ifdef FT_DEBUG_LEVEL_TRACE
    const char*       id;
#endif

  } CFF_Field_Handler;


FT_END_HEADER


#endif /* CFFPARSE_H_ */


/* END */

kc3-lang/freetype/src/cff/cffparse.h

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kc3-lang/freetype /src/cff/cffparse.h