/***************************************************************************/

/*                                                                         */

/*  ftsynth.c                                                              */

/*                                                                         */

/*    FreeType synthesizing code for emboldening and slanting (body).      */

/*                                                                         */

/*  Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2010 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_DEBUG_H

#include FT_INTERNAL_OBJECTS_H

#include FT_OUTLINE_H

#include FT_BITMAP_H

  /*************************************************************************/

  /*                                                                       */

  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */

  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */

  /* messages during execution.                                            */

  /*                                                                       */

#undef  FT_COMPONENT

#define FT_COMPONENT  trace_synth

  /*************************************************************************/

  /*************************************************************************/

  /****                                                                 ****/

  /****   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                    ****/

  /****                                                                 ****/

  /*************************************************************************/

  /*************************************************************************/

  /* documentation is in ftsynth.h */

  FT_EXPORT_DEF( void )

  FT_GlyphSlot_Embolden( FT_GlyphSlot  slot )

  {

    FT_Library  library = slot->library;

    FT_Face     face    = slot->face;

    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 )

    {

      /* ignore error */

      (void)FT_Outline_Embolden( &slot->outline, xstr );

      /* 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 /* slot->format == FT_GLYPH_FORMAT_BITMAP */

    {

      /* round to full pixels */

      xstr &= ~63;

      if ( xstr == 0 )

        xstr = 1 << 6;

      ystr &= ~63;

      /*

       * XXX: overflow check for 16-bit system, for compatibility

       *      with FT_GlyphSlot_Embolden() since freetype-2.1.10.

       *      unfortunately, this function return no informations

       *      about the cause of error.

       */

      if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )

      {

        FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));

        FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr ));

        return;

      }

      error = FT_GlyphSlot_Own_Bitmap( slot );

      if ( error )

        return;

      error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );

      if ( error )

        return;

    }

    if ( slot->advance.x )

      slot->advance.x += xstr;

    if ( slot->advance.y )

      slot->advance.y += ystr;

    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;

    /* XXX: 16-bit overflow case must be excluded before here */

    if ( slot->format == FT_GLYPH_FORMAT_BITMAP )

      slot->bitmap_top += (FT_Int)( ystr >> 6 );

  }

/* END */