Beispiel #1
0
  static FT_Error
  tt_size_select( FT_Size   size,
                  FT_ULong  strike_index )
  {
    TT_Face   ttface = (TT_Face)size->face;
    TT_Size   ttsize = (TT_Size)size;
    FT_Error  error  = FT_Err_Ok;


    ttsize->strike_index = strike_index;

    if ( FT_IS_SCALABLE( size->face ) )
    {
      /* use the scaled metrics, even when tt_size_reset fails */
      FT_Select_Metrics( size->face, strike_index );

      tt_size_reset( ttsize );
    }
    else
    {
      SFNT_Service      sfnt    = (SFNT_Service) ttface->sfnt;
      FT_Size_Metrics*  metrics = &size->metrics;


      error = sfnt->load_strike_metrics( ttface, strike_index, metrics );
      if ( error )
        ttsize->strike_index = 0xFFFFFFFFUL;
    }

    return error;
  }
Beispiel #2
0
sfnt_load_face(FT_Stream stream,
               TT_Face face,
               FT_Int face_index,
               FT_Int num_params,
               FT_Parameter * params)
{
    FT_Error error;

#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
    FT_Error psnames_error;
#endif
    FT_Bool has_outline;
    FT_Bool is_apple_sbit;
    FT_Bool ignore_preferred_family    = FALSE;
    FT_Bool ignore_preferred_subfamily = FALSE;

    SFNT_Service sfnt = (SFNT_Service)face->sfnt;

    FT_UNUSED(face_index);

    /* Check parameters */

    {
        FT_Int i;


        for (i = 0; i < num_params; i++)
        {
            if (params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY)
                ignore_preferred_family = TRUE;
            else if (params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY)
                ignore_preferred_subfamily = TRUE;
        }
    }

    /* Load tables */

    /* We now support two SFNT-based bitmapped font formats.  They */
    /* are recognized easily as they do not include a `glyf'       */
    /* table.                                                      */
    /*                                                             */
    /* The first format comes from Apple, and uses a table named   */
    /* `bhed' instead of `head' to store the font header (using    */
    /* the same format).  It also doesn't include horizontal and   */
    /* vertical metrics tables (i.e. `hhea' and `vhea' tables are  */
    /* missing).                                                   */
    /*                                                             */
    /* The other format comes from Microsoft, and is used with     */
    /* WinCE/PocketPC.  It looks like a standard TTF, except that  */
    /* it doesn't contain outlines.                                */
    /*                                                             */

    FT_TRACE2(("sfnt_load_face: %08p\n\n", face));

    /* do we have outlines in there? */
#ifdef FT_CONFIG_OPTION_INCREMENTAL
    has_outline = FT_BOOL(face->root.internal->incremental_interface != 0 ||
                          tt_face_lookup_table(face, TTAG_glyf) != 0 ||
                          tt_face_lookup_table(face, TTAG_CFF) != 0);
#else
    has_outline = FT_BOOL(tt_face_lookup_table(face, TTAG_glyf) != 0 ||
                          tt_face_lookup_table(face, TTAG_CFF) != 0);
#endif

    is_apple_sbit = 0;

    /* if this font doesn't contain outlines, we try to load */
    /* a `bhed' table                                        */
    if (!has_outline && sfnt->load_bhed)
    {
        LOAD_(bhed);
        is_apple_sbit = FT_BOOL(!error);
    }

    /* load the font header (`head' table) if this isn't an Apple */
    /* sbit font file                                             */
    if (!is_apple_sbit)
    {
        LOAD_(head);
        if (error)
            goto Exit;
    }

    if (face->header.Units_Per_EM == 0)
    {
        error = SFNT_Err_Invalid_Table;

        goto Exit;
    }

    /* the following tables are often not present in embedded TrueType */
    /* fonts within PDF documents, so don't check for them.            */
    LOAD_(maxp);
    LOAD_(cmap);

    /* the following tables are optional in PCL fonts -- */
    /* don't check for errors                            */
    LOAD_(name);
    LOAD_(post);

#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
    psnames_error = error;
#endif

    /* do not load the metrics headers and tables if this is an Apple */
    /* sbit font file                                                 */
    if (!is_apple_sbit)
    {
        /* load the `hhea' and `hmtx' tables */
        LOADM_(hhea, 0);
        if (!error)
        {
            LOADM_(hmtx, 0);
            if (error == SFNT_Err_Table_Missing)
            {
                error = SFNT_Err_Hmtx_Table_Missing;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
                /* If this is an incrementally loaded font and there are */
                /* overriding metrics, tolerate a missing `hmtx' table.  */
                if (face->root.internal->incremental_interface &&
                    face->root.internal->incremental_interface->funcs->
                    get_glyph_metrics)
                {
                    face->horizontal.number_Of_HMetrics = 0;
                    error                               = SFNT_Err_Ok;
                }
#endif
            }
        }
        else if (error == SFNT_Err_Table_Missing)
        {
            /* No `hhea' table necessary for SFNT Mac fonts. */
            if (face->format_tag == TTAG_true)
            {
                FT_TRACE2(("This is an SFNT Mac font.\n"));
                has_outline = 0;
                error       = SFNT_Err_Ok;
            }
            else
            {
                error = SFNT_Err_Horiz_Header_Missing;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
                /* If this is an incrementally loaded font and there are */
                /* overriding metrics, tolerate a missing `hhea' table.  */
                if (face->root.internal->incremental_interface &&
                    face->root.internal->incremental_interface->funcs->
                    get_glyph_metrics)
                {
                    face->horizontal.number_Of_HMetrics = 0;
                    error                               = SFNT_Err_Ok;
                }
#endif
            }
        }

        if (error)
            goto Exit;

        /* try to load the `vhea' and `vmtx' tables */
        LOADM_(hhea, 1);
        if (!error)
        {
            LOADM_(hmtx, 1);
            if (!error)
                face->vertical_info = 1;
        }

        if (error && error != SFNT_Err_Table_Missing)
            goto Exit;

        LOAD_(os2);
        if (error)
        {
            if (error != SFNT_Err_Table_Missing)
                goto Exit;

            face->os2.version = 0xFFFFU;
        }
    }

    /* the optional tables */

    /* embedded bitmap support */
    if (sfnt->load_eblc)
    {
        LOAD_(eblc);
        if (error)
        {
            /* a font which contains neither bitmaps nor outlines is */
            /* still valid (although rather useless in most cases);  */
            /* however, you can find such stripped fonts in PDFs     */
            if (error == SFNT_Err_Table_Missing)
                error = SFNT_Err_Ok;
            else
                goto Exit;
        }
    }

    LOAD_(pclt);
    if (error)
    {
        if (error != SFNT_Err_Table_Missing)
            goto Exit;

        face->pclt.Version = 0;
    }

    /* consider the kerning and gasp tables as optional */
    LOAD_(gasp);
    LOAD_(kern);

    face->root.num_glyphs = face->max_profile.numGlyphs;

    /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes  */
    /* a WWS-only font face.  `WWS' stands for `weight', width', and */
    /* `slope', a term used by Microsoft's Windows Presentation      */
    /* Foundation (WPF).  This flag has been introduced in version   */
    /* 1.5 of the OpenType specification (May 2008).                 */

    face->root.family_name = NULL;
    face->root.style_name  = NULL;
    if (face->os2.version != 0xFFFFU && face->os2.fsSelection & 256)
    {
        if (!ignore_preferred_family)
            GET_NAME(PREFERRED_FAMILY, &face->root.family_name);

        if (!face->root.family_name)
            GET_NAME(FONT_FAMILY, &face->root.family_name);

        if (!ignore_preferred_subfamily)
            GET_NAME(PREFERRED_SUBFAMILY, &face->root.style_name);

        if (!face->root.style_name)
            GET_NAME(FONT_SUBFAMILY, &face->root.style_name);
    }
    else
    {
        GET_NAME(WWS_FAMILY, &face->root.family_name);
        if (!face->root.family_name && !ignore_preferred_family)
            GET_NAME(PREFERRED_FAMILY, &face->root.family_name);

        if (!face->root.family_name)
            GET_NAME(FONT_FAMILY, &face->root.family_name);

        GET_NAME(WWS_SUBFAMILY, &face->root.style_name);
        if (!face->root.style_name && !ignore_preferred_subfamily)
            GET_NAME(PREFERRED_SUBFAMILY, &face->root.style_name);

        if (!face->root.style_name)
            GET_NAME(FONT_SUBFAMILY, &face->root.style_name);
    }

    /* now set up root fields */
    {
        FT_Face root  = &face->root;
        FT_Long flags = root->face_flags;


        /*********************************************************************/
        /*                                                                   */
        /* Compute face flags.                                               */
        /*                                                                   */
        if (has_outline == TRUE)
            flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */

        /* The sfnt driver only supports bitmap fonts natively, thus we */
        /* don't set FT_FACE_FLAG_HINTER.                               */
        flags |= FT_FACE_FLAG_SFNT |      /* SFNT file format  */
                 FT_FACE_FLAG_HORIZONTAL; /* horizontal data   */

#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
        if (psnames_error == SFNT_Err_Ok &&
            face->postscript.FormatType != 0x00030000L)
            flags |= FT_FACE_FLAG_GLYPH_NAMES;
#endif

        /* fixed width font? */
        if (face->postscript.isFixedPitch)
            flags |= FT_FACE_FLAG_FIXED_WIDTH;

        /* vertical information? */
        if (face->vertical_info)
            flags |= FT_FACE_FLAG_VERTICAL;

        /* kerning available ? */
        if (TT_FACE_HAS_KERNING(face))
            flags |= FT_FACE_FLAG_KERNING;

#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
        /* Don't bother to load the tables unless somebody asks for them. */
        /* No need to do work which will (probably) not be used.          */
        if (tt_face_lookup_table(face, TTAG_glyf) != 0 &&
            tt_face_lookup_table(face, TTAG_fvar) != 0 &&
            tt_face_lookup_table(face, TTAG_gvar) != 0)
            flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
#endif

        root->face_flags = flags;

        /*********************************************************************/
        /*                                                                   */
        /* Compute style flags.                                              */
        /*                                                                   */

        flags = 0;
        if (has_outline == TRUE && face->os2.version != 0xFFFFU)
        {
            /* We have an OS/2 table; use the `fsSelection' field.  Bit 9 */
            /* indicates an oblique font face.  This flag has been        */
            /* introduced in version 1.5 of the OpenType specification.   */

            if (face->os2.fsSelection & 512)     /* bit 9 */
                flags |= FT_STYLE_FLAG_ITALIC;
            else if (face->os2.fsSelection & 1)  /* bit 0 */
                flags |= FT_STYLE_FLAG_ITALIC;

            if (face->os2.fsSelection & 32)      /* bit 5 */
                flags |= FT_STYLE_FLAG_BOLD;
        }
        else
        {
            /* this is an old Mac font, use the header field */

            if (face->header.Mac_Style & 1)
                flags |= FT_STYLE_FLAG_BOLD;

            if (face->header.Mac_Style & 2)
                flags |= FT_STYLE_FLAG_ITALIC;
        }

        root->style_flags = flags;

        /*********************************************************************/
        /*                                                                   */
        /* Polish the charmaps.                                              */
        /*                                                                   */
        /*   Try to set the charmap encoding according to the platform &     */
        /*   encoding ID of each charmap.                                    */
        /*                                                                   */

        tt_face_build_cmaps(face);  /* ignore errors */


        /* set the encoding fields */
        {
            FT_Int m;


            for (m = 0; m < root->num_charmaps; m++)
            {
                FT_CharMap charmap = root->charmaps[m];


                charmap->encoding = sfnt_find_encoding(charmap->platform_id,
                                                       charmap->encoding_id);

#if 0
                if (root->charmap == NULL &&
                    charmap->encoding == FT_ENCODING_UNICODE)
                {
                    /* set 'root->charmap' to the first Unicode encoding we find */
                    root->charmap = charmap;
                }
#endif
            }
        }

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
        /*
         *  Now allocate the root array of FT_Bitmap_Size records and
         *  populate them.  Unfortunately, it isn't possible to indicate bit
         *  depths in the FT_Bitmap_Size record.  This is a design error.
         */
        {
            FT_UInt i, count;


#ifndef FT_CONFIG_OPTION_OLD_INTERNALS
            count = face->sbit_num_strikes;
#else
            count = (FT_UInt)face->num_sbit_strikes;
#endif

            if (count > 0)
            {
                FT_Memory       memory   = face->root.stream->memory;
                FT_UShort       em_size  = face->header.Units_Per_EM;
                FT_Short        avgwidth = face->os2.xAvgCharWidth;
                FT_Size_Metrics metrics;


                if (em_size == 0 || face->os2.version == 0xFFFFU)
                {
                    avgwidth = 0;
                    em_size  = 1;
                }

                if (FT_NEW_ARRAY(root->available_sizes, count))
                    goto Exit;

                for (i = 0; i < count; i++)
                {
                    FT_Bitmap_Size *bsize = root->available_sizes + i;


                    error = sfnt->load_strike_metrics(face, i, &metrics);
                    if (error)
                        goto Exit;

                    bsize->height = (FT_Short)(metrics.height >> 6);
                    bsize->width  = (FT_Short)(
                        (avgwidth * metrics.x_ppem + em_size / 2) / em_size);

                    bsize->x_ppem = metrics.x_ppem << 6;
                    bsize->y_ppem = metrics.y_ppem << 6;

                    /* assume 72dpi */
                    bsize->size = metrics.y_ppem << 6;
                }

                root->face_flags     |= FT_FACE_FLAG_FIXED_SIZES;
                root->num_fixed_sizes = (FT_Int)count;
            }
        }
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

        /* a font with no bitmaps and no outlines is scalable; */
        /* it has only empty glyphs then                       */
        if (!FT_HAS_FIXED_SIZES(root) && !FT_IS_SCALABLE(root))
            root->face_flags |= FT_FACE_FLAG_SCALABLE;


        /*********************************************************************/
        /*                                                                   */
        /*  Set up metrics.                                                  */
        /*                                                                   */
        if (FT_IS_SCALABLE(root))
        {
            /* XXX What about if outline header is missing */
            /*     (e.g. sfnt wrapped bitmap)?             */
            root->bbox.xMin    = face->header.xMin;
            root->bbox.yMin    = face->header.yMin;
            root->bbox.xMax    = face->header.xMax;
            root->bbox.yMax    = face->header.yMax;
            root->units_per_EM = face->header.Units_Per_EM;


            /* XXX: Computing the ascender/descender/height is very different */
            /*      from what the specification tells you.  Apparently, we    */
            /*      must be careful because                                   */
            /*                                                                */
            /*      - not all fonts have an OS/2 table; in this case, we take */
            /*        the values in the horizontal header.  However, these    */
            /*        values very often are not reliable.                     */
            /*                                                                */
            /*      - otherwise, the correct typographic values are in the    */
            /*        sTypoAscender, sTypoDescender & sTypoLineGap fields.    */
            /*                                                                */
            /*        However, certain fonts have these fields set to 0.      */
            /*        Rather, they have usWinAscent & usWinDescent correctly  */
            /*        set (but with different values).                        */
            /*                                                                */
            /*      As an example, Arial Narrow is implemented through four   */
            /*      files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
            /*                                                                */
            /*      Strangely, all fonts have the same values in their        */
            /*      sTypoXXX fields, except ARIALNB which sets them to 0.     */
            /*                                                                */
            /*      On the other hand, they all have different                */
            /*      usWinAscent/Descent values -- as a conclusion, the OS/2   */
            /*      table cannot be used to compute the text height reliably! */
            /*                                                                */

            /* The ascender/descender/height are computed from the OS/2 table */
            /* when found.  Otherwise, they're taken from the horizontal      */
            /* header.                                                        */
            /*                                                                */

            root->ascender  = face->horizontal.Ascender;
            root->descender = face->horizontal.Descender;

            root->height = (FT_Short)(root->ascender - root->descender +
                                      face->horizontal.Line_Gap);

#if 0
            /* if the line_gap is 0, we add an extra 15% to the text height --  */
            /* this computation is based on various versions of Times New Roman */
            if (face->horizontal.Line_Gap == 0)
                root->height = (FT_Short)((root->height * 115 + 50) / 100);
#endif /* 0 */

#if 0
            /* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */
            /* "sTypoLineGap" fields set to 0, like ARIALNB.TTF             */
            if (face->os2.version != 0xFFFFU && root->ascender)
            {
                FT_Int height;


                root->ascender  = face->os2.sTypoAscender;
                root->descender = -face->os2.sTypoDescender;

                height = root->ascender + root->descender + face->os2.sTypoLineGap;
                if (height > root->height)
                    root->height = height;
            }
#endif /* 0 */

            root->max_advance_width  = face->horizontal.advance_Width_Max;
            root->max_advance_height = (FT_Short)(face->vertical_info
                                                  ? face->vertical.advance_Height_Max
                                                  : root->height);

            /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
            /* Adjust underline position from top edge to centre of     */
            /* stroke to convert TrueType meaning to FreeType meaning.  */
            root->underline_position = face->postscript.underlinePosition -
                                       face->postscript.underlineThickness / 2;
            root->underline_thickness = face->postscript.underlineThickness;
        }
    }