ftcsbits.c

下载来的一个看图软件的源代码

        /* add the size of a given glyph image */
        size += pitch * sbit->height;
      }
    }

    return size;
  }


  FT_CALLBACK_DEF( FT_Bool )
  ftc_sbit_node_compare( FTC_SBitNode   snode,
                         FTC_SBitQuery  squery,
                         FTC_Cache      cache )
  {
    FTC_GlyphQuery  gquery = FTC_GLYPH_QUERY( squery );
    FTC_GlyphNode   gnode  = FTC_GLYPH_NODE( snode );
    FT_Bool         result;


    result = ftc_glyph_node_compare( gnode, gquery );
    if ( result )
    {
      /* check if we need to load the glyph bitmap now */
      FT_UInt   gindex = gquery->gindex;
      FTC_SBit  sbit   = snode->sbits + ( gindex - gnode->item_start );


      if ( sbit->buffer == NULL && sbit->width != 255 )
      {
        FT_ULong  size;


        if ( !ftc_sbit_node_load(
                snode, cache->manager,
                FTC_SBIT_FAMILY( FTC_QUERY( squery )->family ),
                gindex, &size ) )
          cache->manager->cur_weight += size;
      }
    }

    return result;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                     SBITS FAMILIES                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  FT_CALLBACK_DEF( FT_Error )
  ftc_sbit_family_init( FTC_SBitFamily  sfam,
                        FTC_SBitQuery   squery,
                        FTC_Cache       cache )
  {
    FTC_Manager  manager = cache->manager;
    FT_Error     error;
    FT_Face      face;


    sfam->type = squery->type;

    /* we need to compute "cquery.item_total" now */
    error = FTC_Manager_Lookup_Face( manager,
                                     squery->type.font.face_id,
                                     &face );
    if ( !error )
    {
      error = ftc_glyph_family_init( FTC_GLYPH_FAMILY( sfam ),
                                     FTC_IMAGE_TYPE_HASH( &sfam->type ),
                                     FTC_SBIT_ITEMS_PER_NODE,
                                     face->num_glyphs,
                                     FTC_GLYPH_QUERY( squery ),
                                     cache );
    }

    return error;
  }


  FT_CALLBACK_DEF( FT_Bool )
  ftc_sbit_family_compare( FTC_SBitFamily  sfam,
                           FTC_SBitQuery   squery )
  {
    FT_Bool  result;


    /* we need to set the "cquery.cset" field or our query for */
    /* faster glyph comparisons in ftc_sbit_node_compare       */
    /*                                                         */
    result = FT_BOOL( FTC_IMAGE_TYPE_COMPARE( &sfam->type, &squery->type ) );
    if ( result )
      FTC_GLYPH_FAMILY_FOUND( sfam, squery );

    return result;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                     SBITS CACHE                               *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  FT_CALLBACK_TABLE_DEF
  const FTC_Cache_ClassRec  ftc_sbit_cache_class =
  {
    sizeof ( FTC_CacheRec ),
    (FTC_Cache_InitFunc) ftc_cache_init,
    (FTC_Cache_ClearFunc)ftc_cache_clear,
    (FTC_Cache_DoneFunc) ftc_cache_done,

    sizeof ( FTC_SBitFamilyRec ),
    (FTC_Family_InitFunc)   ftc_sbit_family_init,
    (FTC_Family_CompareFunc)ftc_sbit_family_compare,
    (FTC_Family_DoneFunc)   ftc_glyph_family_done,

    sizeof ( FTC_SBitNodeRec ),
    (FTC_Node_InitFunc)   ftc_sbit_node_init,
    (FTC_Node_WeightFunc) ftc_sbit_node_weight,
    (FTC_Node_CompareFunc)ftc_sbit_node_compare,
    (FTC_Node_DoneFunc)   ftc_sbit_node_done
  };


  /* documentation is in ftcsbits.h */

  FT_EXPORT_DEF( FT_Error )
  FTC_SBitCache_New( FTC_Manager     manager,
                     FTC_SBitCache  *acache )
  {
    return FTC_Manager_Register_Cache( manager,
                                       &ftc_sbit_cache_class,
                                       (FTC_Cache*)acache );
  }


  /* documentation is in ftcsbits.h */

#ifdef FTC_CACHE_USE_INLINE

#define GEN_CACHE_FAMILY_COMPARE( f, q, c ) \
          ftc_sbit_family_compare( (FTC_SBitFamily)(f), (FTC_SBitQuery)(q) )

#define GEN_CACHE_NODE_COMPARE( n, q, c ) \
          ftc_sbit_node_compare( (FTC_SBitNode)(n), (FTC_SBitQuery)(q), c )

#define GEN_CACHE_LOOKUP  ftc_sbit_cache_lookup
#include "ftccache.i"

#else  /* !FTC_CACHE_USE_INLINE */

#define ftc_sbit_cache_lookup  ftc_cache_lookup

#endif /* !FTC_CACHE_USE_INLINE */

  FT_EXPORT_DEF( FT_Error )
  FTC_SBitCache_Lookup( FTC_SBitCache   cache,
                        FTC_ImageType   type,
                        FT_UInt         gindex,
                        FTC_SBit       *ansbit,
                        FTC_Node       *anode )
  {
    FT_Error          error;
    FTC_SBitQueryRec  squery;
    FTC_SBitNode      node;


    /* other argument checks delayed to ftc_cache_lookup */
    if ( !ansbit )
      return FTC_Err_Invalid_Argument;

    *ansbit = NULL;

    if ( anode )
      *anode = NULL;

    squery.gquery.gindex = gindex;
    squery.type          = *type;

    error = ftc_sbit_cache_lookup( FTC_CACHE( cache ),
                                   FTC_QUERY( &squery ),
                                   (FTC_Node*)&node );
    if ( !error )
    {
      *ansbit = node->sbits + ( gindex - FTC_GLYPH_NODE( node )->item_start );

      if ( anode )
      {
        *anode = FTC_NODE( node );
        FTC_NODE( node )->ref_count++;
      }
    }
    return error;
  }


  /* backwards-compatibility functions */

  FT_EXPORT_DEF( FT_Error )
  FTC_SBit_Cache_New( FTC_Manager      manager,
                      FTC_SBit_Cache  *acache )
  {
    return FTC_SBitCache_New( manager, (FTC_SBitCache*)acache );
  }


  FT_EXPORT_DEF( FT_Error )
  FTC_SBit_Cache_Lookup( FTC_SBit_Cache   cache,
                         FTC_Image_Desc*  desc,
                         FT_UInt          gindex,
                         FTC_SBit        *ansbit )
  {
    FTC_ImageTypeRec  type0;


    if ( !desc )
      return FTC_Err_Invalid_Argument;

    type0.font  = desc->font;
    type0.flags = 0;

    /* convert image type flags to load flags */
    {
      FT_UInt  load_flags = FT_LOAD_DEFAULT;
      FT_UInt  type       = desc->image_type;


      /* determine load flags, depending on the font description's */
      /* image type                                                */

      if ( ftc_image_format( type ) == ftc_image_format_bitmap )
      {
        if ( type & ftc_image_flag_monochrome )
          load_flags |= FT_LOAD_MONOCHROME;

        /* disable embedded bitmaps loading if necessary */
        if ( type & ftc_image_flag_no_sbits )
          load_flags |= FT_LOAD_NO_BITMAP;
      }
      else
      {
        /* we want an outline, don't load embedded bitmaps */
        load_flags |= FT_LOAD_NO_BITMAP;

        if ( type & ftc_image_flag_unscaled )
          load_flags |= FT_LOAD_NO_SCALE;
      }

      /* always render glyphs to bitmaps */
      load_flags |= FT_LOAD_RENDER;

      if ( type & ftc_image_flag_unhinted )
        load_flags |= FT_LOAD_NO_HINTING;

      if ( type & ftc_image_flag_autohinted )
        load_flags |= FT_LOAD_FORCE_AUTOHINT;

      type0.flags = load_flags;
    }

    return FTC_SBitCache_Lookup( (FTC_SBitCache)cache,
                                  &type0,
                                  gindex,
                                  ansbit,
                                  NULL );
  }


/* END */