ftglyph.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

   static FT_Error
   ft_new_glyph( FT_Library             library,
                 const FT_Glyph_Class*  clazz,
                 FT_Glyph*              aglyph )
   {
     FT_Memory  memory = library->memory;
     FT_Error   error;
     FT_Glyph   glyph;


     *aglyph = 0;

     if ( !FT_ALLOC( glyph, clazz->glyph_size ) )
     {
       glyph->library = library;
       glyph->clazz   = clazz;
       glyph->format  = clazz->glyph_format;

       *aglyph = glyph;
     }

     return error;
   }


  /* documentation is in ftglyph.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Glyph_Copy( FT_Glyph   source,
                 FT_Glyph  *target )
  {
    FT_Glyph               copy;
    FT_Error               error;
    const FT_Glyph_Class*  clazz;


    /* check arguments */
    if ( !target || !source || !source->clazz )
    {
      error = FT_Err_Invalid_Argument;
      goto Exit;
    }

    *target = 0;

    clazz = source->clazz;
    error = ft_new_glyph( source->library, clazz, &copy );
    if ( error )
      goto Exit;

    copy->advance = source->advance;
    copy->format  = source->format;

    if ( clazz->glyph_copy )
      error = clazz->glyph_copy( source, copy );

    if ( error )
      FT_Done_Glyph( copy );
    else
      *target = copy;

  Exit:
    return error;
  }


  /* documentation is in ftglyph.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Get_Glyph( FT_GlyphSlot  slot,
                FT_Glyph     *aglyph )
  {
    FT_Library  library;
    FT_Error    error;
    FT_Glyph    glyph;

    const FT_Glyph_Class*  clazz = 0;


    if ( !slot )
      return FT_Err_Invalid_Slot_Handle;

    library = slot->library;

    if ( !aglyph )
      return FT_Err_Invalid_Argument;

    /* if it is a bitmap, that's easy :-) */
    if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
      clazz = &ft_bitmap_glyph_class;

    /* it it is an outline too */
    else if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
      clazz = &ft_outline_glyph_class;

    else
    {
      /* try to find a renderer that supports the glyph image format */
      FT_Renderer  render = FT_Lookup_Renderer( library, slot->format, 0 );


      if ( render )
        clazz = &render->glyph_class;
    }

    if ( !clazz )
    {
      error = FT_Err_Invalid_Glyph_Format;
      goto Exit;
    }

    /* create FT_Glyph object */
    error = ft_new_glyph( library, clazz, &glyph );
    if ( error )
      goto Exit;

    /* copy advance while converting it to 16.16 format */
    glyph->advance.x = slot->advance.x << 10;
    glyph->advance.y = slot->advance.y << 10;

    /* now import the image from the glyph slot */
    error = clazz->glyph_init( glyph, slot );

    /* if an error occurred, destroy the glyph */
    if ( error )
      FT_Done_Glyph( glyph );
    else
      *aglyph = glyph;

  Exit:
    return error;
  }


  /* documentation is in ftglyph.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Glyph_Transform( FT_Glyph    glyph,
                      FT_Matrix*  matrix,
                      FT_Vector*  delta )
  {
    const FT_Glyph_Class*  clazz;
    FT_Error               error = FT_Err_Ok;


    if ( !glyph || !glyph->clazz )
      error = FT_Err_Invalid_Argument;
    else
    {
      clazz = glyph->clazz;
      if ( clazz->glyph_transform )
      {
        /* transform glyph image */
        clazz->glyph_transform( glyph, matrix, delta );

        /* transform advance vector */
        if ( matrix )
          FT_Vector_Transform( &glyph->advance, matrix );
      }
      else
        error = FT_Err_Invalid_Glyph_Format;
    }
    return error;
  }


  /* documentation is in ftglyph.h */

  FT_EXPORT_DEF( void )
  FT_Glyph_Get_CBox( FT_Glyph  glyph,
                     FT_UInt   bbox_mode,
                     FT_BBox  *acbox )
  {
    const FT_Glyph_Class*  clazz;


    if ( !acbox )
      return;

    acbox->xMin = acbox->yMin = acbox->xMax = acbox->yMax = 0;

    if ( !glyph || !glyph->clazz )
      return;
    else
    {
      clazz = glyph->clazz;
      if ( !clazz->glyph_bbox )
        return;
      else
      {
        /* retrieve bbox in 26.6 coordinates */
        clazz->glyph_bbox( glyph, acbox );

        /* perform grid fitting if needed */
        if ( bbox_mode == FT_GLYPH_BBOX_GRIDFIT ||
             bbox_mode == FT_GLYPH_BBOX_PIXELS  )
        {
          acbox->xMin = FT_PIX_FLOOR( acbox->xMin );
          acbox->yMin = FT_PIX_FLOOR( acbox->yMin );
          acbox->xMax = FT_PIX_CEIL( acbox->xMax );
          acbox->yMax = FT_PIX_CEIL( acbox->yMax );
        }

        /* convert to integer pixels if needed */
        if ( bbox_mode == FT_GLYPH_BBOX_TRUNCATE ||
             bbox_mode == FT_GLYPH_BBOX_PIXELS   )
        {
          acbox->xMin >>= 6;
          acbox->yMin >>= 6;
          acbox->xMax >>= 6;
          acbox->yMax >>= 6;
        }
      }
    }
    return;
  }


  /* documentation is in ftglyph.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Glyph_To_Bitmap( FT_Glyph*       the_glyph,
                      FT_Render_Mode  render_mode,
                      FT_Vector*      origin,
                      FT_Bool         destroy )
  {
    FT_GlyphSlotRec           dummy;
    FT_GlyphSlot_InternalRec  dummy_internal;
    FT_Error                  error = FT_Err_Ok;
    FT_Glyph                  glyph;
    FT_BitmapGlyph            bitmap = NULL;

    const FT_Glyph_Class*     clazz;


    /* check argument */
    if ( !the_glyph )
      goto Bad;

    /* we render the glyph into a glyph bitmap using a `dummy' glyph slot */
    /* then calling FT_Render_Glyph_Internal()                            */

    glyph = *the_glyph;
    if ( !glyph )
      goto Bad;

    clazz = glyph->clazz;

    /* when called with a bitmap glyph, do nothing and return successfully */
    if ( clazz == &ft_bitmap_glyph_class )
      goto Exit;

    if ( !clazz || !clazz->glyph_prepare )
      goto Bad;

    FT_MEM_ZERO( &dummy, sizeof ( dummy ) );
    FT_MEM_ZERO( &dummy_internal, sizeof ( dummy_internal ) );
    dummy.internal = &dummy_internal;
    dummy.library  = glyph->library;
    dummy.format   = clazz->glyph_format;

    /* create result bitmap glyph */
    error = ft_new_glyph( glyph->library, &ft_bitmap_glyph_class,
                          (FT_Glyph*)(void*)&bitmap );
    if ( error )
      goto Exit;

#if 1
    /* if `origin' is set, translate the glyph image */
    if ( origin )
      FT_Glyph_Transform( glyph, 0, origin );
#else
    FT_UNUSED( origin );
#endif

    /* prepare dummy slot for rendering */
    error = clazz->glyph_prepare( glyph, &dummy );
    if ( !error )
      error = FT_Render_Glyph_Internal( glyph->library, &dummy, render_mode );

#if 1
    if ( !destroy && origin )
    {
      FT_Vector  v;


      v.x = -origin->x;
      v.y = -origin->y;
      FT_Glyph_Transform( glyph, 0, &v );
    }
#endif

    if ( error )
      goto Exit;

    /* in case of success, copy the bitmap to the glyph bitmap */
    error = ft_bitmap_glyph_init( (FT_Glyph)bitmap, &dummy );
    if ( error )
      goto Exit;

    /* copy advance */
    bitmap->root.advance = glyph->advance;

    if ( destroy )
      FT_Done_Glyph( glyph );

    *the_glyph = FT_GLYPH( bitmap );

  Exit:
    if ( error && bitmap )
      FT_Done_Glyph( FT_GLYPH( bitmap ) );

    return error;

  Bad:
    error = FT_Err_Invalid_Argument;
    goto Exit;
  }


  /* documentation is in ftglyph.h */

  FT_EXPORT_DEF( void )
  FT_Done_Glyph( FT_Glyph  glyph )
  {
    if ( glyph )
    {
      FT_Memory              memory = glyph->library->memory;
      const FT_Glyph_Class*  clazz  = glyph->clazz;


      if ( clazz->glyph_done )
        clazz->glyph_done( glyph );

      FT_FREE( glyph );
    }
  }


/* END */