154 lines
5.5 KiB
C
154 lines
5.5 KiB
C
/***************************************************************************/
|
|
/* */
|
|
/* ftsynth.c */
|
|
/* */
|
|
/* FreeType synthesizing code for emboldening and slanting (body). */
|
|
/* */
|
|
/* Copyright 2000-2006, 2010, 2012 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 = 0x0366AL;
|
|
transform.yy = 0x10000L;
|
|
|
|
FT_Outline_Transform( outline, &transform );
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/**** ****/
|
|
/**** EXPERIMENTAL EMBOLDENING 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_EmboldenXY( &slot->outline, xstr, ystr );
|
|
}
|
|
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.horiAdvance += xstr;
|
|
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 */
|