diff options
Diffstat (limited to 'src/truetype/ttsubpix.c')
| -rw-r--r-- | src/truetype/ttsubpix.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/src/truetype/ttsubpix.c b/src/truetype/ttsubpix.c new file mode 100644 index 0000000..2dc6c2f --- /dev/null +++ b/src/truetype/ttsubpix.c @@ -0,0 +1,261 @@ +/***************************************************************************/ +/* */ +/* 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 */ |