freetype2/src/autofit/afblue.hin

/****************************************************************************
 *
 * afblue.h
 *
 *   Auto-fitter data for blue strings (specification).
 *
 * Copyright (C) 2013-2021 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 AFBLUE_H_
#define AFBLUE_H_


FT_BEGIN_HEADER


  /* an auxiliary macro to decode a UTF-8 character -- since we only use */
  /* hard-coded, self-converted data, no error checking is performed     */
#define GET_UTF8_CHAR( ch, p )                      \
          do                                        \
          {                                         \
            ch = (unsigned char)*p++;               \
            if ( ch >= 0x80 )                       \
            {                                       \
              FT_UInt  len_;                        \
                                                    \
                                                    \
              if ( ch < 0xE0 )                      \
              {                                     \
                len_ = 1;                           \
                ch  &= 0x1F;                        \
              }                                     \
              else if ( ch < 0xF0 )                 \
              {                                     \
                len_ = 2;                           \
                ch  &= 0x0F;                        \
              }                                     \
              else                                  \
              {                                     \
                len_ = 3;                           \
                ch  &= 0x07;                        \
              }                                     \
                                                    \
              for ( ; len_ > 0; len_-- )            \
                ch = ( ch << 6 ) | ( *p++ & 0x3F ); \
            }                                       \
          } while ( 0 )


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    B L U E   S T R I N G S                    *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  /* At the bottommost level, we define strings for finding blue zones. */


#define AF_BLUE_STRING_MAX_LEN  @AF_BLUE_STRING_MAX_LEN@

  /* The AF_Blue_String enumeration values are offsets into the */
  /* `af_blue_strings' array.                                   */

  typedef enum  AF_Blue_String_
  {
@AF_BLUE_STRING_ENUM@

    AF_BLUE_STRING_MAX   /* do not remove */

  } AF_Blue_String;


  FT_LOCAL_ARRAY( char )
  af_blue_strings[];


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                 B L U E   S T R I N G S E T S                 *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  /* The next level is to group blue strings into style-specific sets. */


  /* Properties are specific to a writing system.  We assume that a given  */
  /* blue string can't be used in more than a single writing system, which */
  /* is a safe bet.                                                        */
#define AF_BLUE_PROPERTY_LATIN_TOP       ( 1U << 0 )  /* must have value 1 */
#define AF_BLUE_PROPERTY_LATIN_SUB_TOP   ( 1U << 1 )
#define AF_BLUE_PROPERTY_LATIN_NEUTRAL   ( 1U << 2 )
#define AF_BLUE_PROPERTY_LATIN_X_HEIGHT  ( 1U << 3 )
#define AF_BLUE_PROPERTY_LATIN_LONG      ( 1U << 4 )

#define AF_BLUE_PROPERTY_CJK_TOP    ( 1U << 0 )       /* must have value 1 */
#define AF_BLUE_PROPERTY_CJK_HORIZ  ( 1U << 1 )       /* must have value 2 */
#define AF_BLUE_PROPERTY_CJK_RIGHT  AF_BLUE_PROPERTY_CJK_TOP


#define AF_BLUE_STRINGSET_MAX_LEN  @AF_BLUE_STRINGSET_MAX_LEN@

  /* The AF_Blue_Stringset enumeration values are offsets into the */
  /* `af_blue_stringsets' array.                                   */

  typedef enum  AF_Blue_Stringset_
  {
@AF_BLUE_STRINGSET_ENUM@

    AF_BLUE_STRINGSET_MAX   /* do not remove */

  } AF_Blue_Stringset;


  typedef struct  AF_Blue_StringRec_
  {
    AF_Blue_String  string;
    FT_UShort       properties;

  } AF_Blue_StringRec;


  FT_LOCAL_ARRAY( AF_Blue_StringRec )
  af_blue_stringsets[];

/* */

FT_END_HEADER


#endif /* AFBLUE_H_ */


/* END */