ttapi.c

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

    
    return TT_Err_Ok;
  }


/*******************************************************************
 *
 *  Function    :  TT_Get_Big_Glyph_Metrics
 *
 *  Description :  Extracts the glyph's big metrics information.
 *
 *  Input  :  glyph       glyph object handle
 *            metrics     address where big metrics will be returned
 *
 *  Output :  Error code.
 *
 *  MT-Safe : NO!  Glyph containers can't be shared.
 *
 ******************************************************************/

  EXPORT_FUNC
  TT_Error  TT_Get_Glyph_Big_Metrics( TT_Glyph               glyph,
                                      TT_Big_Glyph_Metrics*  metrics )
  {
    FT_GlyphSlot       slot = (FT_GlyphSlot)glyph;
    FT_Glyph_Metrics*  met;
    FT_Glyph_Metrics*  met2;

    if (!glyph)
      return TT_Err_Invalid_Glyph_Handle;

    met  = &slot->metrics;
    met2 = &slot->metrics2;

    metrics->bbox.xMin = met->horiBearingX;
    metrics->bbox.xMax = met->horiBearingX + met->width;
    metrics->bbox.yMin = met->horiBearingY - met->height;
    metrics->bbox.yMax = met->horiBearingY;

    metrics->horiBearingX = met->horiBearingX;
    metrics->horiBearingY = met->horiBearingY;
    metrics->horiAdvance  = met->horiAdvance;

    metrics->vertBearingX = met->vertBearingX;
    metrics->vertBearingY = met->vertBearingY;
    metrics->vertAdvance  = met->vertAdvance;

    metrics->linearHoriAdvance  = met2->horiAdvance;
    metrics->linearHoriBearingX = met2->horiBearingX;

    metrics->linearVertAdvance  = met2->vertAdvance;
    metrics->linearVertBearingY = met2->vertBearingY;
   
    return TT_Err_Ok;
  }


/*******************************************************************
 *
 *  Function    :  TT_Get_Glyph_Bitmap
 *
 *  Description :  Produces a bitmap from a glyph outline.
 *
 *  Input  :  glyph      the glyph container's handle
 *            map        target pixmap description block
 *            xOffset    x offset in fractional pixels (26.6 format)
 *            yOffset    y offset in fractional pixels (26.6 format)
 *
 *  Output :  Error code.
 *
 *  Note : Only use integer pixel offsets if you want to preserve
 *         the fine hints applied to the outline.  This means that
 *         xOffset and yOffset must be multiples of 64!
 *
 *  MT-Safe : NO!  Glyph containers can't be shared.
 *
 ******************************************************************/

  EXPORT_FUNC
  TT_Error  TT_Get_Glyph_Bitmap( TT_Glyph        glyph,
                                 TT_Raster_Map*  map,
                                 TT_F26Dot6      xOffset,
                                 TT_F26Dot6      yOffset )
  {
    FT_Library     library;
    TT_Error       error;
    FT_GlyphSlot   slot = (FT_GlyphSlot)glyph;
    FT_Outline     outline;
    FT_Raster_Map  bitmap;

    if ( !glyph )
      return TT_Err_Invalid_Glyph_Handle;

    library = slot->face->resource->library;
    outline = slot->outline;

    /* XXX : For now, use only dropout mode 2    */
    /* outline.dropout_mode = _glyph->scan_type; */
    outline.dropout_mode = 2;

    bitmap.width    = map->width;
    bitmap.rows     = map->rows;
    bitmap.cols     = map->cols;
    bitmap.flow     = map->flow;
    bitmap.pix_bits = 1;
    bitmap.buffer   = map->bitmap;

    FT_Translate_Outline( &outline, xOffset, yOffset );

    error = FT_Get_Outline_Bitmap( library, &outline, &bitmap );

    FT_Translate_Outline( &outline, -xOffset, -yOffset );

    return error;
  }


/*******************************************************************
 *
 *  Function    :  TT_Get_Glyph_Pixmap
 *
 *  Description :  Produces a grayscaled pixmap from a glyph
 *                 outline.
 *
 *  Input  :  glyph      the glyph container's handle
 *            map        target pixmap description block
 *            xOffset    x offset in fractional pixels (26.6 format)
 *            yOffset    y offset in fractional pixels (26.6 format)
 *
 *  Output :  Error code.
 *
 *  Note : Only use integer pixel offsets to preserve the fine
 *         hinting of the glyph and the 'correct' anti-aliasing
 *         (where vertical and horizontal stems aren't grayed).
 *         This means that xOffset and yOffset must be multiples
 *         of 64!
 *
 *         You can experiment with offsets of +32 to get 'blurred'
 *         versions of the glyphs (a nice effect at large sizes that
 *         some graphic designers may appreciate :)
 *
 *  MT-Safe : NO!  Glyph containers can't be shared.
 *
 ******************************************************************/

  EXPORT_FUNC
  TT_Error  TT_Get_Glyph_Pixmap( TT_Glyph        glyph,
                                 TT_Raster_Map*  map,
                                 TT_F26Dot6      xOffset,
                                 TT_F26Dot6      yOffset )
  {
    FT_Library     library;
    TT_Error       error;
    FT_GlyphSlot   slot = (FT_GlyphSlot)glyph;
    FT_Outline     outline;
    FT_Raster_Map  bitmap;

    if ( !glyph )
      return TT_Err_Invalid_Glyph_Handle;

    library = slot->face->resource->library;
    outline = slot->outline;

    /* XXX : For now, use only dropout mode 2    */
    /* outline.dropout_mode = _glyph->scan_type; */
    outline.dropout_mode = 2;

    bitmap.width    = map->width;
    bitmap.rows     = map->rows;
    bitmap.cols     = map->cols;
    bitmap.flow     = map->flow;
    bitmap.pix_bits = 8;
    bitmap.buffer   = map->bitmap;

    FT_Translate_Outline( &outline, xOffset, yOffset );

    error = FT_Get_Outline_Bitmap( library, &outline, &bitmap );

    FT_Translate_Outline( &outline, -xOffset, -yOffset );

    return error;
  }



  /***********************************************************************/
  /*                                                                     */
  /* <Function> TT_Get_Outline_Bitmap                                    */
  /*                                                                     */
  /* <Description>                                                       */
  /*     Renders an outline within a bitmap. The outline's image is      */
  /*     simply or-ed to the target bitmap.                              */
  /*                                                                     */
  /* <Input>                                                             */
  /*     engine  ::   handle to the TrueType driver object               */
  /*     outline ::   pointer to the source outline descriptor           */
  /*     raster  ::   pointer to the target bitmap descriptor            */
  /*                                                                     */
  /* <Return>                                                            */
  /*     TrueType error code. 0 means success.                           */
  /*                                                                     */
  /* <MT-Note>                                                           */
  /*     Yes.                                                            */
  /*                                                                     */

  EXPORT_FUNC
  TT_Error  TT_Get_Outline_Bitmap( TT_Engine       engine,
                                   TT_Outline*     outline,
                                   TT_Raster_Map*  map )
  {
    FT_Library     library = (FT_Library)engine;
    FT_Raster_Map  bitmap;

    if ( !engine )
      return TT_Err_Invalid_Engine;

    if ( !outline || !map )
      return TT_Err_Invalid_Argument;

    bitmap.width    = map->width;
    bitmap.rows     = map->rows;
    bitmap.cols     = map->cols;
    bitmap.flow     = map->flow;
    bitmap.pix_bits = 1;
    bitmap.buffer   = map->bitmap;

    return FT_Get_Outline_Bitmap( library, (FT_Outline*)outline, &bitmap );
  }


  /***********************************************************************/
  /*                                                                     */
  /* <Function> TT_Get_Outline_Pixmap                                    */
  /*                                                                     */
  /* <Description>                                                       */
  /*     Renders an outline within a pixmap. The outline's image is      */
  /*     simply or-ed to the target pixmap.                              */
  /*                                                                     */
  /* <Input>                                                             */
  /*     engine  ::   handle to the TrueType driver object               */
  /*     outline ::   pointer to the source outline descriptor           */
  /*     raster  ::   pointer to the target pixmap descriptor            */
  /*                                                                     */
  /* <Return>                                                            */
  /*     TrueType error code. 0 means success.                           */
  /*                                                                     */
  /* <MT-Note>                                                           */
  /*     Yes.                                                            */
  /*                                                                     */

  EXPORT_FUNC
  TT_Error  TT_Get_Outline_Pixmap( TT_Engine       engine,
                                   TT_Outline*     outline,
                                   TT_Raster_Map*  map )
  {
    FT_Library     library = (FT_Library)engine;
    FT_Raster_Map  bitmap;

    if ( !engine )
      return TT_Err_Invalid_Engine;

    if ( !outline || !map )
      return TT_Err_Invalid_Argument;

    bitmap.width    = map->width;
    bitmap.rows     = map->rows;
    bitmap.cols     = map->cols;
    bitmap.flow     = map->flow;
    bitmap.pix_bits = 8;
    bitmap.buffer   = map->bitmap;

    return FT_Get_Outline_Bitmap( library, (FT_Outline*)outline, &bitmap );
  }




  /***********************************************************************/
  /*                                                                     */
  /* <Function> TT_New_Outline                                           */
  /*