pfrobjs.c

来自「奇趣公司比较新的qt/emd版本」· C语言 代码 · 共 577 行 · 第 1/2 页

    pfr_glyph_done( &slot->glyph );
  }


  FT_LOCAL_DEF( FT_Error )
  pfr_slot_load( FT_GlyphSlot  pfrslot,         /* PFR_Slot */
                 FT_Size       pfrsize,         /* PFR_Size */
                 FT_UInt       gindex,
                 FT_Int32      load_flags )
  {
    PFR_Slot     slot    = (PFR_Slot)pfrslot;
    PFR_Size     size    = (PFR_Size)pfrsize;
    FT_Error     error;
    PFR_Face     face    = (PFR_Face)pfrslot->face;
    PFR_Char     gchar;
    FT_Outline*  outline = &pfrslot->outline;
    FT_ULong     gps_offset;


    if ( gindex > 0 )
      gindex--;

    if ( !face || gindex >= face->phy_font.num_chars )
    {
      error = PFR_Err_Invalid_Argument;
      goto Exit;
    }

    /* try to load an embedded bitmap */
    if ( ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP ) ) == 0 )
    {
      error = pfr_slot_load_bitmap( slot, size, gindex );
      if ( error == 0 )
        goto Exit;
    }

    if ( load_flags & FT_LOAD_SBITS_ONLY )
    {
      error = PFR_Err_Invalid_Argument;
      goto Exit;
    }

    gchar               = face->phy_font.chars + gindex;
    pfrslot->format     = FT_GLYPH_FORMAT_OUTLINE;
    outline->n_points   = 0;
    outline->n_contours = 0;
    gps_offset          = face->header.gps_section_offset;

    /* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */
    error = pfr_glyph_load( &slot->glyph, face->root.stream,
                            gps_offset, gchar->gps_offset, gchar->gps_size );

    if ( !error )
    {
      FT_BBox            cbox;
      FT_Glyph_Metrics*  metrics = &pfrslot->metrics;
      FT_Pos             advance;
      FT_Int             em_metrics, em_outline;
      FT_Bool            scaling;


      scaling = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );

      /* copy outline data */
      *outline = slot->glyph.loader->base.outline;

      outline->flags &= ~FT_OUTLINE_OWNER;
      outline->flags |= FT_OUTLINE_REVERSE_FILL;

      if ( size && pfrsize->metrics.y_ppem < 24 )
        outline->flags |= FT_OUTLINE_HIGH_PRECISION;

      /* compute the advance vector */
      metrics->horiAdvance = 0;
      metrics->vertAdvance = 0;

      advance    = gchar->advance;
      em_metrics = face->phy_font.metrics_resolution;
      em_outline = face->phy_font.outline_resolution;

      if ( em_metrics != em_outline )
        advance = FT_MulDiv( advance, em_outline, em_metrics );

      if ( face->phy_font.flags & PFR_PHY_VERTICAL )
        metrics->vertAdvance = advance;
      else
        metrics->horiAdvance = advance;

      pfrslot->linearHoriAdvance = metrics->horiAdvance;
      pfrslot->linearVertAdvance = metrics->vertAdvance;

      /* make-up vertical metrics(?) */
      metrics->vertBearingX = 0;
      metrics->vertBearingY = 0;

#if 0 /* some fonts seem to be broken here! */

      /* Apply the font matrix, if any.                 */
      /* TODO: Test existing fonts with unusual matrix  */
      /* whether we have to adjust Units per EM.        */
      {
        FT_Matrix font_matrix;


        font_matrix.xx = face->log_font.matrix[0] << 8;
        font_matrix.yx = face->log_font.matrix[1] << 8;
        font_matrix.xy = face->log_font.matrix[2] << 8;
        font_matrix.yy = face->log_font.matrix[3] << 8;

        FT_Outline_Transform( outline, &font_matrix );
      }
#endif

      /* scale when needed */
      if ( scaling )
      {
        FT_Int      n;
        FT_Fixed    x_scale = pfrsize->metrics.x_scale;
        FT_Fixed    y_scale = pfrsize->metrics.y_scale;
        FT_Vector*  vec     = outline->points;


        /* scale outline points */
        for ( n = 0; n < outline->n_points; n++, vec++ )
        {
          vec->x = FT_MulFix( vec->x, x_scale );
          vec->y = FT_MulFix( vec->y, y_scale );
        }

        /* scale the advance */
        metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
        metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
      }

      /* compute the rest of the metrics */
      FT_Outline_Get_CBox( outline, &cbox );

      metrics->width        = cbox.xMax - cbox.xMin;
      metrics->height       = cbox.yMax - cbox.yMin;
      metrics->horiBearingX = cbox.xMin;
      metrics->horiBearingY = cbox.yMax - metrics->height;
    }

  Exit:
    return error;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                      KERNING METHOD                           *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL_DEF( FT_Error )
  pfr_face_get_kerning( FT_Face     pfrface,        /* PFR_Face */
                        FT_UInt     glyph1,
                        FT_UInt     glyph2,
                        FT_Vector*  kerning )
  {
    PFR_Face     face     = (PFR_Face)pfrface;
    FT_Error     error    = PFR_Err_Ok;
    PFR_PhyFont  phy_font = &face->phy_font;
    FT_UInt32    code1, code2, pair;


    kerning->x = 0;
    kerning->y = 0;

    if ( glyph1 > 0 )
      glyph1--;

    if ( glyph2 > 0 )
      glyph2--;

    /* convert glyph indices to character codes */
    if ( glyph1 > phy_font->num_chars ||
         glyph2 > phy_font->num_chars )
      goto Exit;

    code1 = phy_font->chars[glyph1].char_code;
    code2 = phy_font->chars[glyph2].char_code;
    pair  = PFR_KERN_INDEX( code1, code2 );

    /* now search the list of kerning items */
    {
      PFR_KernItem  item   = phy_font->kern_items;
      FT_Stream     stream = pfrface->stream;


      for ( ; item; item = item->next )
      {
        if ( pair >= item->pair1 && pair <= item->pair2 )
          goto FoundPair;
      }
      goto Exit;

    FoundPair: /* we found an item, now parse it and find the value if any */
      if ( FT_STREAM_SEEK( item->offset )                       ||
           FT_FRAME_ENTER( item->pair_count * item->pair_size ) )
        goto Exit;

      {
        FT_UInt    count       = item->pair_count;
        FT_UInt    size        = item->pair_size;
        FT_UInt    power       = (FT_UInt)ft_highpow2( (FT_UInt32)count );
        FT_UInt    probe       = power * size;
        FT_UInt    extra       = count - power;
        FT_Byte*   base        = stream->cursor;
        FT_Bool    twobytes    = FT_BOOL( item->flags & 1 );
        FT_Bool    twobyte_adj = FT_BOOL( item->flags & 2 );
        FT_Byte*   p;
        FT_UInt32  cpair;


        if ( extra > 0 )
        {
          p = base + extra * size;

          if ( twobytes )
            cpair = FT_NEXT_ULONG( p );
          else
            cpair = PFR_NEXT_KPAIR( p );

          if ( cpair == pair )
            goto Found;

          if ( cpair < pair )
          {
            if ( twobyte_adj )
              p += 2;
            else
              p++;
            base = p;
          }
        }

        while ( probe > size )
        {
          probe >>= 1;
          p       = base + probe;

          if ( twobytes )
            cpair = FT_NEXT_ULONG( p );
          else
            cpair = PFR_NEXT_KPAIR( p );

          if ( cpair == pair )
            goto Found;

          if ( cpair < pair )
            base += probe;
        }

        p = base;

        if ( twobytes )
          cpair = FT_NEXT_ULONG( p );
        else
          cpair = PFR_NEXT_KPAIR( p );

        if ( cpair == pair )
        {
          FT_Int  value;


        Found:
          if ( twobyte_adj )
            value = FT_PEEK_SHORT( p );
          else
            value = p[0];

          kerning->x = item->base_adj + value;
        }
      }

      FT_FRAME_EXIT();
    }

  Exit:
    return error;
  }

/* END */