misc/libfreetype/src/base/ftsynth.c
author sheepluva
Wed, 02 May 2012 12:24:44 +0200
changeset 6991 1ec44dde5eb9
parent 5172 88f2e05288ba
permissions -rw-r--r--
make search filter field have a useable size on low frontend resolution
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/***************************************************************************/
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/*                                                                         */
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/*  ftsynth.c                                                              */
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/*                                                                         */
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/*    FreeType synthesizing code for emboldening and slanting (body).      */
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/*                                                                         */
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/*  Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2010 by             */
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/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
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/*                                                                         */
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/*  This file is part of the FreeType project, and may only be used,       */
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/*  modified, and distributed under the terms of the FreeType project      */
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/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
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/*  this file you indicate that you have read the license and              */
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/*  understand and accept it fully.                                        */
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/*                                                                         */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_SYNTHESIS_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_OUTLINE_H
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#include FT_BITMAP_H
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  /*************************************************************************/
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  /*                                                                       */
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  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
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  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
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  /* messages during execution.                                            */
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  /*                                                                       */
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#undef  FT_COMPONENT
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#define FT_COMPONENT  trace_synth
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  /*************************************************************************/
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  /*************************************************************************/
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  /****                                                                 ****/
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  /****   EXPERIMENTAL OBLIQUING SUPPORT                                ****/
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  /****                                                                 ****/
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  /*************************************************************************/
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  /*************************************************************************/
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  /* documentation is in ftsynth.h */
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  FT_EXPORT_DEF( void )
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  FT_GlyphSlot_Oblique( FT_GlyphSlot  slot )
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  {
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    FT_Matrix    transform;
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    FT_Outline*  outline = &slot->outline;
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    /* only oblique outline glyphs */
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    if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
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      return;
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    /* we don't touch the advance width */
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    /* For italic, simply apply a shear transform, with an angle */
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    /* of about 12 degrees.                                      */
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    transform.xx = 0x10000L;
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    transform.yx = 0x00000L;
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    transform.xy = 0x06000L;
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    transform.yy = 0x10000L;
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    FT_Outline_Transform( outline, &transform );
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  }
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  /*************************************************************************/
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  /*************************************************************************/
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  /****                                                                 ****/
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  /****   EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT                    ****/
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  /****                                                                 ****/
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  /*************************************************************************/
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  /*************************************************************************/
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  /* documentation is in ftsynth.h */
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  FT_EXPORT_DEF( void )
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  FT_GlyphSlot_Embolden( FT_GlyphSlot  slot )
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  {
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    FT_Library  library = slot->library;
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    FT_Face     face    = slot->face;
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    FT_Error    error;
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    FT_Pos      xstr, ystr;
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    if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
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         slot->format != FT_GLYPH_FORMAT_BITMAP  )
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      return;
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    /* some reasonable strength */
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    xstr = FT_MulFix( face->units_per_EM,
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                      face->size->metrics.y_scale ) / 24;
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    ystr = xstr;
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    if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
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    {
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      /* ignore error */
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      (void)FT_Outline_Embolden( &slot->outline, xstr );
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      /* this is more than enough for most glyphs; if you need accurate */
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      /* values, you have to call FT_Outline_Get_CBox                   */
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      xstr = xstr * 2;
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      ystr = xstr;
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    }
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    else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
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    {
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      /* round to full pixels */
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      xstr &= ~63;
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      if ( xstr == 0 )
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        xstr = 1 << 6;
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      ystr &= ~63;
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      /*
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       * XXX: overflow check for 16-bit system, for compatibility
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       *      with FT_GlyphSlot_Embolden() since freetype-2.1.10.
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       *      unfortunately, this function return no informations
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       *      about the cause of error.
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       */
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      if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )
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      {
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        FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
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        FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr ));
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        return;
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      }
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      error = FT_GlyphSlot_Own_Bitmap( slot );
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      if ( error )
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        return;
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      error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );
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      if ( error )
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        return;
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    }
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    if ( slot->advance.x )
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      slot->advance.x += xstr;
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    if ( slot->advance.y )
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      slot->advance.y += ystr;
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    slot->metrics.width        += xstr;
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    slot->metrics.height       += ystr;
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    slot->metrics.horiBearingY += ystr;
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    slot->metrics.horiAdvance  += xstr;
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    slot->metrics.vertBearingX -= xstr / 2;
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    slot->metrics.vertBearingY += ystr;
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    slot->metrics.vertAdvance  += ystr;
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    /* XXX: 16-bit overflow case must be excluded before here */
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    if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
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      slot->bitmap_top += (FT_Int)( ystr >> 6 );
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  }
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88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   159
88f2e05288ba aaand let's add freetype as well while we are at it
koda
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/* END */