kc3-lang/freetype/src/base/ftsynth.c

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• Hash : d7e6b767
  Author :
  Date : 2006-02-25T06:24:28
  

  Formatting, copyright years, minor cleanups.

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• src/base/ftsynth.c

• /***************************************************************************/
  /*                                                                         */
  /*  ftsynth.c                                                              */
  /*                                                                         */
  /*    FreeType synthesizing code for emboldening and slanting (body).      */
  /*                                                                         */
  /*  Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006 by                   */
  /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  /*                                                                         */
  /*  This file is part of the FreeType project, and may only be used,       */
  /*  modified, and distributed under the terms of the FreeType project      */
  /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  /*  this file you indicate that you have read the license and              */
  /*  understand and accept it fully.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #include <ft2build.h>
  #include FT_SYNTHESIS_H
  #include FT_INTERNAL_OBJECTS_H
  #include FT_OUTLINE_H
  #include FT_BITMAP_H
  
  
    /*************************************************************************/
    /*************************************************************************/
    /****                                                                 ****/
    /****   EXPERIMENTAL OBLIQUING SUPPORT                                ****/
    /****                                                                 ****/
    /*************************************************************************/
    /*************************************************************************/
  
    /* documentation is in ftsynth.h */
  
    FT_EXPORT_DEF( void )
    FT_GlyphSlot_Oblique( FT_GlyphSlot  slot )
    {
      FT_Matrix    transform;
      FT_Outline*  outline = &slot->outline;
  
  
      /* only oblique outline glyphs */
      if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
        return;
  
      /* we don't touch the advance width */
  
      /* For italic, simply apply a shear transform, with an angle */
      /* of about 12 degrees.                                      */
  
      transform.xx = 0x10000L;
      transform.yx = 0x00000L;
  
      transform.xy = 0x06000L;
      transform.yy = 0x10000L;
  
      FT_Outline_Transform( outline, &transform );
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /****                                                                 ****/
    /****   EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT                    ****/
    /****                                                                 ****/
    /*************************************************************************/
    /*************************************************************************/
  
  
    FT_EXPORT_DEF( FT_Error )
    FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot  slot )
    {
      if ( slot && slot->format == FT_GLYPH_FORMAT_BITMAP   &&
           !( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) )
      {
        FT_Bitmap  bitmap;
        FT_Error   error;
  
  
        FT_Bitmap_New( &bitmap );
        error = FT_Bitmap_Copy( slot->library, &slot->bitmap, &bitmap );
        if ( error )
          return error;
  
        slot->bitmap = bitmap;
        slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
      }
  
      return FT_Err_Ok;
    }
  
  
    /* documentation is in ftsynth.h */
  
    FT_EXPORT_DEF( void )
    FT_GlyphSlot_Embolden( FT_GlyphSlot  slot )
    {
      FT_Library  library = slot->library;
      FT_Face     face    = FT_SLOT_FACE( slot );
      FT_Error    error;
      FT_Pos      xstr, ystr;
  
  
      if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
           slot->format != FT_GLYPH_FORMAT_BITMAP )
        return;
  
      /* some reasonable strength */
      xstr = FT_MulFix( face->units_per_EM,
                        face->size->metrics.y_scale ) / 24;
      ystr = xstr;
  
      if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
      {
        error = FT_Outline_Embolden( &slot->outline, xstr );
        /* ignore error */
  
        /* this is more than enough for most glyphs; if you need accurate */
        /* values, you have to call FT_Outline_Get_CBox                   */
        xstr = xstr * 2;
        ystr = xstr;
      }
      else if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
      {
        xstr = FT_PIX_FLOOR( xstr );
        if ( xstr == 0 )
          xstr = 1 << 6;
        ystr = FT_PIX_FLOOR( ystr );
  
        error = FT_GlyphSlot_Own_Bitmap( slot );
        if ( error )
          return;
  
        error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );
        if ( error )
          return;
      }
  
      /* assume the layout is horizontal */
      slot->advance.x += xstr;
  
      slot->metrics.width        += xstr;
      slot->metrics.height       += ystr;
      slot->metrics.horiBearingY += ystr;
      slot->metrics.horiAdvance  += xstr;
      slot->metrics.vertBearingX -= xstr / 2;
      slot->metrics.vertBearingY += ystr;
      slot->metrics.vertAdvance  += ystr;
  
      if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
        slot->bitmap_top += ystr >> 6;
    }
  
  
  /* END */
  

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