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/***************************************************************************/
/* */
/* 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 <freetype/internal/ftobjs.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 if ( 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 */
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