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/***************************************************************************/
/* */
/* ttsubpix.c */
/* */
/* TrueType Subpixel Hinting. */
/* */
/* Copyright 2010-2011 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_INTERNAL_DEBUG_H
#include FT_INTERNAL_CALC_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_SFNT_H
#include FT_TRUETYPE_TAGS_H
#include FT_OUTLINE_H
#include "ttsubpix.h"
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
FT_LOCAL_DEF( FT_Bool )
is_member_of_family_class( const FT_String* detected_font_name,
const FT_String* rule_font_name )
{
FT_UInt i, j;
/* If font name matches rule family */
if ( strcmp( detected_font_name, rule_font_name ) == 0 ) return TRUE;
/* If font name is a wildcard "" */
if ( strcmp( rule_font_name, "" ) == 0 ) return TRUE;
/* If font name is contained in a class list */
for ( i = 0; i < FAMILY_CLASS_RULES_SIZE; i++ )
{
if ( strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 )
{
for ( j = 0; j < MAX_CLASS_MEMBERS; j++ )
{
if ( strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 )
continue;
if ( strcmp( FAMILY_CLASS_Rules[i].member[j], detected_font_name ) == 0 )
return TRUE;
}
}
}
return FALSE;
}
FT_LOCAL_DEF( FT_Bool )
is_member_of_style_class( const FT_String* detected_font_style,
const FT_String* rule_font_style )
{
FT_UInt i, j;
/* If font style matches rule style */
if ( strcmp( detected_font_style, rule_font_style ) == 0 ) return TRUE;
/* If font style is a wildcard "" */
if ( strcmp( rule_font_style, "" ) == 0 ) return TRUE;
/* If font style is contained in a class list */
for ( i = 0; i < STYLE_CLASS_RULES_SIZE; i++ )
{
if ( strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 )
{
for ( j = 0; j < MAX_CLASS_MEMBERS; j++ )
{
if ( strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 )
continue;
if ( strcmp( STYLE_CLASS_Rules[i].member[j], detected_font_style ) == 0 )
return TRUE;
}
}
}
return FALSE;
}
FT_LOCAL_DEF( FT_Bool )
sph_test_tweak( TT_Face face,
FT_String* family,
int ppem,
FT_String* style,
FT_UInt glyph_index,
SPH_TweakRule* rule,
FT_UInt num_rules )
{
FT_UInt i;
/* rule checks may be able to be optimized further */
for ( i = 0; i < num_rules; i++ )
{
if ( family &&
( is_member_of_family_class ( family, rule[i].family ) ) )
if ( rule[i].ppem == 0 ||
rule[i].ppem == ppem )
if ( style &&
is_member_of_style_class ( style, rule[i].style ) )
if ( rule[i].glyph == 0 ||
FT_Get_Char_Index( (FT_Face)face,
rule[i].glyph ) == glyph_index )
return TRUE;
}
return FALSE;
}
FT_LOCAL_DEF( float )
scale_test_tweak( TT_Face face,
FT_String* family,
int ppem,
FT_String* style,
FT_UInt glyph_index,
SPH_ScaleRule* rule,
FT_UInt num_rules )
{
FT_UInt i;
/* rule checks may be able to be optimized further */
for ( i = 0; i < num_rules; i++ )
{
if ( family &&
( is_member_of_family_class ( family, rule[i].family ) ) )
if ( rule[i].ppem == 0 ||
rule[i].ppem == ppem )
if ( style &&
is_member_of_style_class( style, rule[i].style ) )
if ( rule[i].glyph == 0 ||
FT_Get_Char_Index( (FT_Face)face,
rule[i].glyph ) == glyph_index )
return rule[i].scale;
}
return 1.0;
}
#define TWEAK_RULES( x ) \
if ( sph_test_tweak( face, family, ppem, style, glyph_index, \
x##_Rules, x##_RULES_SIZE ) ) \
loader->exec->sph_tweak_flags |= SPH_TWEAK_##x;
#define TWEAK_RULES_EXCEPTIONS( x ) \
if ( sph_test_tweak( face, family, ppem, style, glyph_index, \
x##_Rules_Exceptions, x##_RULES_EXCEPTIONS_SIZE ) ) \
loader->exec->sph_tweak_flags &= ~SPH_TWEAK_##x;
FT_LOCAL_DEF( void )
sph_set_tweaks( TT_Loader loader,
FT_UInt glyph_index )
{
TT_Face face = (TT_Face)loader->face;
FT_String* family = face->root.family_name;
int ppem = loader->size->metrics.x_ppem;
FT_String* style = face->root.style_name;
/* Don't apply rules if style isn't set */
if ( !face->root.style_name ) return;
#ifdef SPH_DEBUG_MORE_VERBOSE
printf( "%s,%d,%s,%c=%d ", family, ppem, style, glyph_index, glyph_index );
#endif
TWEAK_RULES( PIXEL_HINTING );
if ( loader->exec->sph_tweak_flags & SPH_TWEAK_PIXEL_HINTING )
{
loader->exec->ignore_x_mode = FALSE;
return;
}
TWEAK_RULES( ALLOW_X_DMOVE );
TWEAK_RULES( ALLOW_X_DMOVEX );
TWEAK_RULES( ALLOW_X_MOVE_ZP2 );
TWEAK_RULES( ALWAYS_DO_DELTAP );
TWEAK_RULES( ALWAYS_SKIP_DELTAP );
TWEAK_RULES( DEEMBOLDEN );
TWEAK_RULES( DELTAP_SKIP_EXAGGERATED_VALUES );
TWEAK_RULES( DO_SHPIX );
TWEAK_RULES( EMBOLDEN );
TWEAK_RULES( MIAP_HACK );
TWEAK_RULES( NORMAL_ROUND );
TWEAK_RULES( NO_ALIGNRP_AFTER_IUP );
TWEAK_RULES( NO_CALL_AFTER_IUP );
TWEAK_RULES( NO_DELTAP_AFTER_IUP );
TWEAK_RULES( RASTERIZER_35 );
TWEAK_RULES( SKIP_INLINE_DELTAS );
TWEAK_RULES( SKIP_IUP );
TWEAK_RULES( MIRP_CVT_ZERO );
TWEAK_RULES( SKIP_OFFPIXEL_Y_MOVES );
TWEAK_RULES_EXCEPTIONS( SKIP_OFFPIXEL_Y_MOVES );
TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES );
TWEAK_RULES_EXCEPTIONS( SKIP_NONPIXEL_Y_MOVES );
TWEAK_RULES( ROUND_NONPIXEL_Y_MOVES );
TWEAK_RULES_EXCEPTIONS( ROUND_NONPIXEL_Y_MOVES );
if ( loader->exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
{
if ( loader->exec->rasterizer_version != 35 )
{
loader->exec->rasterizer_version = 35;
/* must re-execute fpgm */
loader->exec->size->cvt_ready = FALSE;
tt_size_ready_bytecode( loader->exec->size,
FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) );
}
}
else
{
if ( loader->exec->rasterizer_version == 35 )
{
loader->exec->rasterizer_version = 37;
/* must re-execute fpgm */
loader->exec->size->cvt_ready = FALSE;
tt_size_ready_bytecode( loader->exec->size,
FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) );
}
}
if ( IS_HINTED( loader->load_flags ) )
{
TWEAK_RULES( TIMES_NEW_ROMAN_HACK );
TWEAK_RULES( COURIER_NEW_2_HACK );
}
if ( sph_test_tweak( face, family, ppem, style, glyph_index,
COMPATIBILITY_MODE_Rules, COMPATIBILITY_MODE_RULES_SIZE ) )
{
loader->exec->compatibility_mode |= TRUE;
loader->exec->ignore_x_mode |= TRUE;
}
else
loader->exec->compatibility_mode &= FALSE;
if ( IS_HINTED( loader->load_flags ) )
{
if ( sph_test_tweak( face, family, ppem, style, glyph_index,
COMPATIBLE_WIDTHS_Rules, COMPATIBLE_WIDTHS_RULES_SIZE ) )
loader->exec->compatible_widths |= TRUE;
}
}
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
/* END */
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