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[truetype] Support subpixel hinting. 

This is the large, famous `Infinality' patch to support ClearType
bytecode which has been available from
http://www.infinality.net/blog/ for some time, and which has been
refined over the last years.  While still experimental, it is now
mature enough to be included directly into FreeType.

Most of the code is based on the ClearType whitepaper written by
Greg Hitchcock

  http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx

which gives a detailed overview of the necessary changes to the
Microsoft rasterizer so that older fonts are supported.  However, a
lot of details are still missing, and this patches provides a
framework to easily handle rendering issues down to the glyph level
of certain fonts.

Note that ClearType support is not completely implemented!  In
particular, full support for the options `compatible_widths',
`symmetrical_smoothing, and `bgr' (via the GETINFO bytecode
instruction) is missing.

* src/truetype/ttsubpix.c: New file, providing code to handle
`tweaks', this is, rules for certain glyphs in certain fonts
(including wildcards) which need a special treatment.

* src/truetype/ttsubpix.h: New file, holding the tweaking rules.

* include/freetype/config/ftoption.h, src/devel/ftoption.h
(TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro.

* include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID,
FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros.

* src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include
`ttsubpix.c'.

* src/truetype/ttgload.c: Include `ttsubpix.h'.
[All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.]

(tt_get_metrics): Set tweak flags.
(TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary.
(TT_Process_Simple_Glyph): Compensate emboldening if necessary.
(compute_glyph_metrics): Handle `compatible widths' option.
(tt_loader_init): Handle ClearType GETINFO information bits.

* src/truetype/rules.mk (TT_DRC_SRC): Updated.

* src/truetype/ttinterp.c: Include `ttsubpix.h'.
[Where necessary, changes below are guarded by
TT_CONFIG_OPTION_SUBPIXEL_HINTING.]

(Direct_Move, Direct_Move_X): Extended.
(Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid,
Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45,
SetSuperRound): Add parameter to handle the number of grid lines per
pixel.
(SET_SuperRound, ROUND_None, CUR_Func_round): Updated.
(DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated.
(DO_ROUND, DO_NROUND): Updated.
(DO_RS): Take care of `Typeman' bytecode patterns.
(Ins_FDEF): Add some debugging code.  Commented out.
(Ins_ENDF): Restore state.
(Ins_CALL, Ins_LOOPCALL): Handle inline delta functions.
(Ins_MD): Handle `Vacuform' rounds.
(Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP,
Ins_MDRP, Ins_MIRP): Handle tweaks.
(Ins_ALIGNRP): Add tweak guard.
(Ins_IUP, Ins_DELTAP): Handle tweaks.
(Ins_GETINFO): Handle new ClearType bits.
(TT_RunIns): Handle tweaks.

* src/truetype/ttinterp.h: Updated.
(SPH_TweakRule, SPH_ScaleRule): New structures for tweaks.
(TT_ExecContextRec): Add members for subpixel hinting support.

* src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
This commit is contained in:
Infinality 2012-06-18 10:36:06 +02:00 committed by Werner Lemberg
parent 320613eeb8
commit 79e36baebb
12 changed files with 2319 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
ChangeLog
View File

@ -1,3 +1,85 @@
2012-06-18 Infinality <infinality@infinality.net>
[truetype] Support subpixel hinting.
This is the large, famous `Infinality' patch to support ClearType
bytecode which has been available from
http://www.infinality.net/blog/ for some time, and which has been
refined over the last years. While still experimental, it is now
mature enough to be included directly into FreeType.
Most of the code is based on the ClearType whitepaper written by
Greg Hitchcock
http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx
which gives a detailed overview of the necessary changes to the
Microsoft rasterizer so that older fonts are supported. However, a
lot of details are still missing, and this patches provides a
framework to easily handle rendering issues down to the glyph level
of certain fonts.
Note that ClearType support is not completely implemented! In
particular, full support for the options `compatible_widths',
`symmetrical_smoothing, and `bgr' (via the GETINFO bytecode
instruction) is missing.
* src/truetype/ttsubpix.c: New file, providing code to handle
`tweaks', this is, rules for certain glyphs in certain fonts
(including wildcards) which need a special treatment.
* src/truetype/ttsubpix.h: New file, holding the tweaking rules.
* include/freetype/config/ftoption.h, src/devel/ftoption.h
(TT_CONFIG_OPTION_SUBPIXEL_HINTING): New macro.
* include/freetype/internal/ftobjs.h (FT_PIX_FLOOR_GRID,
FT_PIX_ROUND_GRID, FT_PIX_CEIL_GRID): New macros.
* src/truetype/truetype.c [TT_USE_BYTECODE_INTERPRETER]: Include
`ttsubpix.c'.
* src/truetype/ttgload.c: Include `ttsubpix.h'.
[All changes below are guarded by TT_CONFIG_OPTION_SUBPIXEL_HINTING.]
(tt_get_metrics): Set tweak flags.
(TT_Hint_Glyph): Call `FT_Outline_EmboldenXY' if necessary.
(TT_Process_Simple_Glyph): Compensate emboldening if necessary.
(compute_glyph_metrics): Handle `compatible widths' option.
(tt_loader_init): Handle ClearType GETINFO information bits.
* src/truetype/rules.mk (TT_DRC_SRC): Updated.
* src/truetype/ttinterp.c: Include `ttsubpix.h'.
[Where necessary, changes below are guarded by
TT_CONFIG_OPTION_SUBPIXEL_HINTING.]
(Direct_Move, Direct_Move_X): Extended.
(Round_None, Round_To_Grid, Round_To_Half_Grid, Round_Down_To_Grid,
Round_Up_To_Grid, Round_To_Double_Grid, Round_Super, Round_Super_45,
SetSuperRound): Add parameter to handle the number of grid lines per
pixel.
(SET_SuperRound, ROUND_None, CUR_Func_round): Updated.
(DO_SROUND, DOS45ROUND, DO_ODD, DO_EVEN): Updated.
(DO_ROUND, DO_NROUND): Updated.
(DO_RS): Take care of `Typeman' bytecode patterns.
(Ins_FDEF): Add some debugging code. Commented out.
(Ins_ENDF): Restore state.
(Ins_CALL, Ins_LOOPCALL): Handle inline delta functions.
(Ins_MD): Handle `Vacuform' rounds.
(Move_Zp2_Point, Ins_SHPIX, Ins_MSIRP, Ins_MDAP, Ins_MIAP,
Ins_MDRP, Ins_MIRP): Handle tweaks.
(Ins_ALIGNRP): Add tweak guard.
(Ins_IUP, Ins_DELTAP): Handle tweaks.
(Ins_GETINFO): Handle new ClearType bits.
(TT_RunIns): Handle tweaks.
* src/truetype/ttinterp.h: Updated.
(SPH_TweakRule, SPH_ScaleRule): New structures for tweaks.
(TT_ExecContextRec): Add members for subpixel hinting support.
* src/truetype/ttobjs.h (TT_DefRecord): Add `inline_delta' member.
2012-06-15 Werner Lemberg <wl@gnu.org>
* Version 2.4.10 released.

22
devel/ftoption.h
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@ -558,6 +558,28 @@ FT_BEGIN_HEADER
#define TT_CONFIG_OPTION_BYTECODE_INTERPRETER
/*************************************************************************/
/* */
/* Define TT_CONFIG_OPTION_SUBPIXEL_HINTING if you want to compile */
/* EXPERIMENTAL subpixel hinting support into the TrueType driver. This */
/* replaces the native TrueType hinting mechanism when anything but */
/* FT_RENDER_MODE_MONO is requested. */
/* */
/* Enabling this causes the TrueType driver to ignore instructions under */
/* certain conditions. This is done in accordance with the guide here, */
/* with some minor differences: */
/* */
/* http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx */
/* */
/* By undefining this, you only compile the code necessary to hint */
/* TrueType glyphs with native TT hinting. */
/* */
/* This option requires TT_CONFIG_OPTION_BYTECODE_INTERPRETER to be */
/* defined. */
/* */
#define TT_CONFIG_OPTION_SUBPIXEL_HINTING
/*************************************************************************/
/* */
/* If you define TT_CONFIG_OPTION_UNPATENTED_HINTING, a special version */

22
include/freetype/config/ftoption.h
View File

@ -558,6 +558,28 @@ FT_BEGIN_HEADER
#define TT_CONFIG_OPTION_BYTECODE_INTERPRETER
/*************************************************************************/
/* */
/* Define TT_CONFIG_OPTION_SUBPIXEL_HINTING if you want to compile */
/* EXPERIMENTAL subpixel hinting support into the TrueType driver. This */
/* replaces the native TrueType hinting mechanism when anything but */
/* FT_RENDER_MODE_MONO is requested. */
/* */
/* Enabling this causes the TrueType driver to ignore instructions under */
/* certain conditions. This is done in accordance with the guide here, */
/* with some minor differences: */
/* */
/* http://www.microsoft.com/typography/cleartype/truetypecleartype.aspx */
/* */
/* By undefining this, you only compile the code necessary to hint */
/* TrueType glyphs with native TT hinting. */
/* */
/* This option requires TT_CONFIG_OPTION_BYTECODE_INTERPRETER to be */
/* defined. */
/* */
/* #define TT_CONFIG_OPTION_SUBPIXEL_HINTING */
/*************************************************************************/
/* */
/* If you define TT_CONFIG_OPTION_UNPATENTED_HINTING, a special version */

8
include/freetype/internal/ftobjs.h
View File

@ -81,6 +81,14 @@ FT_BEGIN_HEADER
#define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
#define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
/*
* These are used in ttinterp.c for subpixel hinting with an
* adjustable grids-per-pixel value.
*/
#define FT_PIX_FLOOR_GRID( x, n ) ( (x) & ~( 64 / (n) - 1 ) )
#define FT_PIX_ROUND_GRID( x, n ) FT_PIX_FLOOR_GRID( (x) + 32 / (n), (n) )
#define FT_PIX_CEIL_GRID( x, n ) FT_PIX_FLOOR_GRID( (x) + 63 / (n), (n) )
/*
* Return the highest power of 2 that is <= value; this correspond to

5
src/truetype/rules.mk
View File

@ -3,7 +3,7 @@
#
# Copyright 1996-2000, 2001, 2003, 2004, 2011 by
# Copyright 1996-2001, 2003-2004, 2011-2012 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
#
# This file is part of the FreeType project, and may only be used, modified,
@ -31,7 +31,8 @@ TT_DRV_SRC := $(TT_DIR)/ttdriver.c \
$(TT_DIR)/ttinterp.c \
$(TT_DIR)/ttobjs.c \
$(TT_DIR)/ttpic.c \
$(TT_DIR)/ttpload.c
$(TT_DIR)/ttpload.c \
$(TT_DIR)/ttsubpix.c
# TrueType driver headers
#

3
src/truetype/truetype.c
View File

@ -4,7 +4,7 @@
/* */
/* FreeType TrueType driver component (body only). */
/* */
/* Copyright 1996-2001, 2004, 2006 by */
/* Copyright 1996-2001, 2004, 2006, 2012 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -27,6 +27,7 @@
#ifdef TT_USE_BYTECODE_INTERPRETER
#include "ttinterp.c"
#include "ttsubpix.c"
#endif
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

152
src/truetype/ttgload.c
View File

@ -32,6 +32,7 @@
#endif
#include "tterrors.h"
#include "ttsubpix.h"
/*************************************************************************/
@ -149,6 +150,15 @@
loader->top_bearing = top_bearing;
loader->vadvance = advance_height;
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
if ( loader->exec )
loader->exec->sph_tweak_flags = 0;
/* this may not be the right place for this, but it works */
if ( loader->exec && loader->exec->ignore_x_mode )
sph_set_tweaks( loader, glyph_index );
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
if ( !loader->linear_def )
{
loader->linear_def = 1;
@ -813,6 +823,13 @@
loader->pp4 = zone->cur[zone->n_points - 1];
}
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN )
FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 );
else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN )
FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 );
#endif
return TT_Err_Ok;
}
@ -835,6 +852,14 @@
FT_Outline* outline;
FT_Int n_points;
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
TT_Face face = (TT_Face)loader->face;
FT_String* family = face->root.family_name;
FT_Int ppem = loader->size->metrics.x_ppem;
FT_String* style = face->root.style_name;
FT_Int x_scale_factor = 1000;
#endif
outline = &gloader->current.outline;
n_points = outline->n_points;
@ -889,6 +914,32 @@
loader->zone.n_points + 4 );
}
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
/* scale, but only if enabled and only if TT hinting is being used */
if ( IS_HINTED( loader->load_flags ) )
x_scale_factor = scale_test_tweak( face, family, ppem, style,
loader->glyph_index, X_SCALING_Rules,
X_SCALING_RULES_SIZE );
/* scale the glyph */
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ||
x_scale_factor != 1000 )
{
FT_Vector* vec = outline->points;
FT_Vector* limit = outline->points + n_points;
FT_Fixed x_scale = FT_MulDiv(
((TT_Size)loader->size)->metrics.x_scale,
x_scale_factor, 1000 );
FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
/* compensate for any scaling by de/emboldening; */
/* the amount was determined via experimentation */
if ( x_scale_factor != 1000 && ppem > 11 )
FT_Outline_EmboldenXY( outline,
FT_MulDiv( 16 * ppem,
1000 - x_scale_factor,
0x1000L ), 0 );
#else
/* scale the glyph */
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
@ -896,6 +947,7 @@
FT_Vector* limit = outline->points + n_points;
FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
for ( ; vec < limit; vec++ )
@ -1648,12 +1700,26 @@
{
FT_Byte* widthp;
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
FT_Bool ignore_x_mode;
ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) !=
FT_RENDER_MODE_MONO );
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
widthp = tt_face_get_device_metrics( face,
size->root.metrics.x_ppem,
glyph_index );
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
if ( widthp &&
( ( ignore_x_mode && loader->exec->compatible_widths ) ||
!ignore_x_mode ||
SPH_OPTION_BITMAP_WIDTHS ) )
#else
if ( widthp )
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
glyph->metrics.horiAdvance = *widthp << 6;
}
@ -1848,6 +1914,15 @@
{
TT_ExecContext exec;
FT_Bool grayscale;
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
FT_Bool subpixel_hinting;
FT_Bool grayscale_hinting;
#if 0
FT_Bool compatible_widths;
FT_Bool symmetrical_smoothing;
FT_Bool bgr;
#endif
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
if ( !size->cvt_ready )
@ -1865,11 +1940,86 @@
if ( !exec )
return TT_Err_Could_Not_Find_Context;
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags )
!= FT_RENDER_MODE_MONO ) &&
SPH_OPTION_SET_SUBPIXEL );
if ( subpixel_hinting )
grayscale = grayscale_hinting = FALSE;
else if ( SPH_OPTION_SET_GRAYSCALE )
{
grayscale = grayscale_hinting = TRUE;
subpixel_hinting = FALSE;
}
if ( FT_IS_TRICKY( glyph->face ) )
subpixel_hinting = grayscale_hinting = FALSE;
exec->ignore_x_mode = subpixel_hinting || grayscale_hinting;
exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
exec->rasterizer_version = 35;
#if 1
exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS;
exec->symmetrical_smoothing = FALSE;
exec->bgr = FALSE;
#else /* 0 */
exec->compatible_widths =
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
TT_LOAD_COMPATIBLE_WIDTHS );
exec->symmetrical_smoothing =
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
TT_LOAD_SYMMETRICAL_SMOOTHING );
exec->bgr =
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=
TT_LOAD_BGR );
#endif /* 0 */
#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
grayscale =
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO );
#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
TT_Load_Context( exec, face, size );
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
/* a change from mono to subpixel rendering (and vice versa) */
/* requires a re-execution of the CVT program */
if ( subpixel_hinting != exec->subpixel_hinting )
{
FT_UInt i;
exec->subpixel_hinting = subpixel_hinting;
for ( i = 0; i < size->cvt_size; i++ )
size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
tt_size_run_prep( size, pedantic );
}
/* a change from mono to grayscale rendering (and vice versa) */
/* requires a re-execution of the CVT program */
if ( grayscale != exec->grayscale_hinting )
{
FT_UInt i;
exec->grayscale_hinting = grayscale_hinting;
for ( i = 0; i < size->cvt_size; i++ )
size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
tt_size_run_prep( size, pedantic );
}
#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
/* a change from mono to grayscale rendering (and vice versa) */
/* requires a re-execution of the CVT program */
if ( grayscale != exec->grayscale )
@ -1887,6 +2037,8 @@
tt_size_run_prep( size, pedantic );
}
#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
/* see whether the cvt program has disabled hinting */
if ( exec->GS.instruct_control & 1 )
load_flags |= FT_LOAD_NO_HINTING;

844
src/truetype/ttinterp.c
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File diff suppressed because it is too large Load Diff

82
src/truetype/ttinterp.h
View File

@ -4,7 +4,7 @@
/* */
/* TrueType bytecode interpreter (specification). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010 by */
/* Copyright 1996-2007, 2010, 2012 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -68,7 +68,8 @@ FT_BEGIN_HEADER
/* Rounding function */
typedef FT_F26Dot6
(*TT_Round_Func)( EXEC_OP_ FT_F26Dot6 distance,
FT_F26Dot6 compensation );
FT_F26Dot6 compensation,
FT_Int resolution );
/* Point displacement along the freedom vector routine */
typedef void
@ -107,6 +108,48 @@ FT_BEGIN_HEADER
} TT_CallRec, *TT_CallStack;
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
/*************************************************************************/
/* */
/* These structures define rules used to tweak subpixel hinting for */
/* various fonts. "", 0, "", NULL value indicates to match any value. */
/* */
#define MAX_NAME_SIZE 32
#define MAX_CLASS_MEMBERS 100
typedef struct SPH_TweakRule_
{
const char family[MAX_NAME_SIZE];
const FT_UInt ppem;
const char style[MAX_NAME_SIZE];
const FT_ULong glyph;
} SPH_TweakRule;
typedef struct SPH_ScaleRule_
{
const char family[MAX_NAME_SIZE];
const FT_UInt ppem;
const char style[MAX_NAME_SIZE];
const FT_ULong glyph;
const FT_ULong scale;
} SPH_ScaleRule;
typedef struct Font_Class_
{
const char name[MAX_NAME_SIZE];
const char member[MAX_CLASS_MEMBERS][MAX_NAME_SIZE];
} Font_Class;
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
/*************************************************************************/
/* */
/* The main structure for the interpreter which collects all necessary */
@ -218,6 +261,41 @@ FT_BEGIN_HEADER
FT_Bool grayscale; /* are we hinting for grayscale? */
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
TT_Round_Func func_round_sphn; /* subpixel rounding function */
FT_Bool grayscale_hinting; /* Using grayscale hinting? */
FT_Bool subpixel_hinting; /* Using subpixel hinting? */
FT_Bool native_hinting; /* Using native hinting? */
FT_Bool ignore_x_mode; /* Standard rendering mode for */
/* subpixel hinting. On if gray */
/* or subpixel hinting is on ) */
FT_Bool compatibility_mode;/* Additional exceptions to */
/* native TT rules for legacy */
/* fonts. Implies */
/* ignore_x_mode. */
/* The following 4 aren't fully implemented but here for MS rasterizer */
/* compatibility. */
FT_Bool compatible_widths; /* compatible widths? */
FT_Bool symmetrical_smoothing; /* symmetrical_smoothing? */
FT_Bool bgr; /* bgr instead of rgb? */
FT_Bool subpixel_positioned; /* subpixel positioned */
/* (DirectWrite ClearType)? */
FT_Int rasterizer_version; /* MS rasterizer version */
FT_Bool iup_called; /* IUP called for glyph? */
FT_Bool in_delta_function; /* inside an inline delta */
/* function? */
FT_ULong sph_tweak_flags; /* flags to control */
/* hint tweaks */
FT_Int num_delta_funcs;
FT_ULong inline_delta_funcs[5];
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
} TT_ExecContextRec;

13
src/truetype/ttobjs.h
View File

@ -173,11 +173,12 @@ FT_BEGIN_HEADER
/* */
typedef struct TT_DefRecord_
{
FT_Int range; /* in which code range is it located? */
FT_Long start; /* where does it start? */
FT_Long end; /* where does it end? */
FT_UInt opc; /* function #, or instruction code */
FT_Bool active; /* is it active? */
FT_Int range; /* in which code range is it located? */
FT_Long start; /* where does it start? */
FT_Long end; /* where does it end? */
FT_UInt opc; /* function #, or instruction code */
FT_Bool active; /* is it active? */
FT_Bool inline_delta; /* is function that defines inline delta? */
} TT_DefRecord, *TT_DefArray;
@ -190,7 +191,7 @@ FT_BEGIN_HEADER
{
FT_Fixed xx, xy; /* transformation matrix coefficients */
FT_Fixed yx, yy;
FT_F26Dot6 ox, oy; /* offsets */
FT_F26Dot6 ox, oy; /* offsets */
} TT_Transform;

280
src/truetype/ttsubpix.c Normal file
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@ -0,0 +1,280 @@
/***************************************************************************/
/* */
/* ttsubpix.c */
/* */
/* TrueType Subpixel Hinting. */
/* */
/* Copyright 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_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;
/* Does font name match rule family? */
if ( strcmp( detected_font_name, rule_font_name ) == 0 )
return TRUE;
/* Is font name a wildcard ""? */
if ( strcmp( rule_font_name, "" ) == 0 )
return TRUE;
/* Is font name 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;
/* Does font style match rule style? */
if ( strcmp( detected_font_style, rule_font_style ) == 0 )
return TRUE;
/* Is font style a wildcard ""? */
if ( strcmp( rule_font_style, "" ) == 0 )
return TRUE;
/* Is font style 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,
FT_UInt 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( FT_UInt )
scale_test_tweak( TT_Face face,
FT_String* family,
FT_UInt 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 1000;
}
#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 = SPH_OPTION_SET_RASTERIZER_VERSION;
/* 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 */

897
src/truetype/ttsubpix.h Normal file
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@ -0,0 +1,897 @@
/***************************************************************************/
/* */
/* ttsubpix.h */
/* */
/* TrueType Subpixel Hinting. */
/* */
/* Copyright 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. */
/* */
/***************************************************************************/
#ifndef __TTSUBPIX_H__
#define __TTSUBPIX_H__
#include <ft2build.h>
#include "ttobjs.h"
#include "ttinterp.h"
FT_BEGIN_HEADER
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
/*************************************************************************/
/* */
/* Tweak flags that are set for each glyph by the below rules. */
/* */
/* */
#define SPH_TWEAK_ALLOW_X_DMOVE 0x0000001
#define SPH_TWEAK_ALLOW_X_DMOVEX 0x0000002
#define SPH_TWEAK_ALLOW_X_MOVE_ZP2 0x0000004
#define SPH_TWEAK_ALWAYS_DO_DELTAP 0x0000008
#define SPH_TWEAK_ALWAYS_SKIP_DELTAP 0x0000010
#define SPH_TWEAK_COURIER_NEW_2_HACK 0x0000020
#define SPH_TWEAK_DEEMBOLDEN 0x0000040
#define SPH_TWEAK_DELTAP_SKIP_EXAGGERATED_VALUES 0x0000080
#define SPH_TWEAK_DO_SHPIX 0x0000100
#define SPH_TWEAK_EMBOLDEN 0x0000200
#define SPH_TWEAK_MIAP_HACK 0x0000400
#define SPH_TWEAK_NORMAL_ROUND 0x0000800
#define SPH_TWEAK_NO_ALIGNRP_AFTER_IUP 0x0001000
#define SPH_TWEAK_NO_CALL_AFTER_IUP 0x0002000
#define SPH_TWEAK_NO_DELTAP_AFTER_IUP 0x0004000
#define SPH_TWEAK_PIXEL_HINTING 0x0008000
#define SPH_TWEAK_RASTERIZER_35 0x0010000
#define SPH_TWEAK_ROUND_NONPIXEL_Y_MOVES 0x0020000
#define SPH_TWEAK_SKIP_INLINE_DELTAS 0x0040000
#define SPH_TWEAK_SKIP_IUP 0x0080000
#define SPH_TWEAK_SKIP_NONPIXEL_Y_MOVES 0x0100000
#define SPH_TWEAK_SKIP_OFFPIXEL_Y_MOVES 0x0200000
#define SPH_TWEAK_TIMES_NEW_ROMAN_HACK 0x0400000
#define SPH_TWEAK_MIRP_CVT_ZERO 0x0800000
FT_LOCAL( FT_Bool )
sph_test_tweak( TT_Face face,
FT_String* family,
FT_UInt ppem,
FT_String* style,
FT_UInt glyph_index,
SPH_TweakRule* rule,
FT_UInt num_rules );
FT_LOCAL_DEF( FT_UInt )
scale_test_tweak( TT_Face face,
FT_String* family,
FT_UInt ppem,
FT_String* style,
FT_UInt glyph_index,
SPH_ScaleRule* rule,
FT_UInt num_rules );
FT_LOCAL( void )
sph_set_tweaks( TT_Loader loader,
FT_UInt glyph_index );
/*************************************************************************/
/* */
/* These rules affect how the TT Interpreter does hinting, with the */
/* goal of doing subpixel hinting by (in general) ignoring x moves. */
/* Some of these rules are fixes that go above and beyond the */
/* stated techniques in the MS whitepaper on Cleartype, due to */
/* artifacts in many glyphs. So, these rules make some glyphs render */
/* better than they do in the MS rasterizer. */
/* */
/* "" string or 0 int/char indicates to apply to all glyphs. */
/* "-" used as dummy placeholders, but any non-matching string works. */
/* */
/* Some of this could arguably be implemented in fontconfig, however: */
/* */
/* - Fontconfig can't set things on a glyph-by-glyph basis. */
/* - The tweaks that happen here are very low-level, from an average */
/* user's point of view and are best implemented in the hinter. */
/* */
/* The goal is to make the subpixel hinting techniques as generalized */
/* as possible across all fonts to prevent the need for extra rules such */
/* as these. */
/* */
/* The rule structure is designed so that entirely new rules can easily */
/* be added when a new compatibility feature is discovered. */
/* */
/* The rule structures could also use some enhancement to handle ranges. */
/* */
/* ****************** WORK IN PROGRESS ******************* */
/* */
/* These macros are defined absent a method for setting them */
#define SPH_OPTION_BITMAP_WIDTHS FALSE
#define SPH_OPTION_SET_SUBPIXEL TRUE
#define SPH_OPTION_SET_GRAYSCALE FALSE
#define SPH_OPTION_SET_COMPATIBLE_WIDTHS FALSE
#define SPH_OPTION_SET_RASTERIZER_VERSION 38
#define SPH_OPTION_GRIDLINES_PER_PIXEL_X 64
#define SPH_OPTION_GRIDLINES_PER_PIXEL_Y 1
/* Define this to force natural (i.e. not bitmap-compatible) widths. */
/* The default leans strongly towards natural widths except for a few */
/* legacy fonts where a selective combination produces nicer results. */
/* #define FORCE_NATURAL_WIDTHS */
/* These are `classes' of fonts that can be grouped together and used in */
/* rules below. A blank entry "" is required at the end of these! */
#define FAMILY_CLASS_RULES_SIZE 7
Font_Class FAMILY_CLASS_Rules
[FAMILY_CLASS_RULES_SIZE] =
{
{ "MS Legacy Fonts",
{ "Aharoni",
"Andale Mono",
"Andalus",
"Angsana New",
"AngsanaUPC",
"Arabic Transparent",
"Arial Black",
"Arial Narrow",
"Arial Unicode MS",
"Arial",
"Batang",
"Browallia New",
"BrowalliaUPC",
"Comic Sans MS",
"Cordia New",
"CordiaUPC",
"Courier New",
"DFKai-SB",
"David Transparent",
"David",
"DilleniaUPC",
"Estrangelo Edessa",
"EucrosiaUPC",
"FangSong_GB2312",
"Fixed Miriam Transparent",
"FrankRuehl",
"Franklin Gothic Medium",
"FreesiaUPC",
"Garamond",
"Gautami",
"Georgia",
"Gulim",
"Impact",
"IrisUPC",
"JasmineUPC",
"KaiTi_GB2312",
"KodchiangUPC",
"Latha",
"Levenim MT",
"LilyUPC",
"Lucida Console",
"Lucida Sans Unicode",
"MS Gothic",
"MS Mincho",
"MV Boli",
"Mangal",
"Marlett",
"Microsoft Sans Serif",
"Mingliu",
"Miriam Fixed",
"Miriam Transparent",
"Miriam",
"Narkisim",
"Palatino Linotype",
"Raavi",
"Rod Transparent",
"Rod",
"Shruti",
"SimHei",
"Simplified Arabic Fixed",
"Simplified Arabic",
"Simsun",
"Sylfaen",
"Symbol",
"Tahoma",
"Times New Roman",
"Traditional Arabic",
"Trebuchet MS",
"Tunga",
"Verdana",
"Webdings",
"Wingdings",
"",
},
},
{ "Core MS Legacy Fonts",
{ "Arial Black",
"Arial Narrow",
"Arial Unicode MS",
"Arial",
"Comic Sans MS",
"Courier New",
"Garamond",
"Georgia",
"Impact",
"Lucida Console",
"Lucida Sans Unicode",
"Microsoft Sans Serif",
"Palatino Linotype",
"Tahoma",
"Times New Roman",
"Trebuchet MS",
"Verdana",
"",
},
},
{ "Apple Legacy Fonts",
{ "Geneva",
"Times",
"Monaco",
"Century",
"Chalkboard",
"Lobster",
"Century Gothic",
"Optima",
"Lucida Grande",
"Gill Sans",
"Baskerville",
"Helvetica",
"Helvetica Neue",
"",
},
},
{ "Legacy Sans Fonts",
{ "Andale Mono",
"Arial Unicode MS",
"Arial",
"Century Gothic",
"Comic Sans MS",
"Franklin Gothic Medium",
"Geneva",
"Lucida Console",
"Lucida Grande",
"Lucida Sans Unicode",
"Microsoft Sans Serif",
"Monaco",
"Tahoma",
"Trebuchet MS",
"Verdana",
"",
},
},
{ "Misc Legacy Fonts",
{ "Dark Courier", "", }, },
{ "Verdana Clones",
{ "DejaVu Sans",
"Bitstream Vera Sans", "", }, },
{ "Verdana and Clones",
{ "DejaVu Sans",
"Bitstream Vera Sans",
"Verdana", "", }, },
};
/* Define `classes' of styles that can be grouped together and used in */
/* rules below. A blank entry "" is required at the end of these! */
#define STYLE_CLASS_RULES_SIZE 5
Font_Class STYLE_CLASS_Rules
[STYLE_CLASS_RULES_SIZE] =
{
{ "Regular Class",
{ "Regular",
"Book",
"Medium",
"Roman",
"Normal",
"",
},
},
{ "Regular/Italic Class",
{ "Regular",
"Book",
"Medium",
"Italic",
"Oblique",
"Roman",
"Normal",
"",
},
},
{ "Bold/BoldItalic Class",
{ "Bold",
"Bold Italic",
"Black",
"",
},
},
{ "Bold/Italic/BoldItalic Class",
{ "Bold",
"Bold Italic",
"Black",
"Italic",
"Oblique",
"",
},
},
{ "Regular/Bold Class",
{ "Regular",
"Book",
"Medium",
"Normal",
"Roman",
"Bold",
"Black",
"",
},
},
};
/* Special fixes for known legacy fonts; */
/* this is the primary workhorse rule for legacy fonts */
#define COMPATIBILITY_MODE_RULES_SIZE 4
SPH_TweakRule COMPATIBILITY_MODE_Rules
[COMPATIBILITY_MODE_RULES_SIZE] =
{
{ "MS Legacy Fonts", 0, "", 0 },
{ "Apple Legacy Fonts", 0, "", 0 },
{ "Misc Legacy Fonts", 0, "", 0 },
{ "Verdana Clones", 0, "", 0 },
};
/* Don't do subpixel (ignore_x_mode) hinting; do normal hinting. */
#define PIXEL_HINTING_RULES_SIZE 4
SPH_TweakRule PIXEL_HINTING_Rules
[PIXEL_HINTING_RULES_SIZE] =
{
/* these characters are almost always safe */
{ "", 0, "", '<' },
{ "", 0, "", '>' },
/* fixes the vanishing stem */
{ "Times New Roman", 0, "Bold", 'A' },
{ "Times New Roman", 0, "Bold", 'V' },
};
/* According to Greg Hitchcock and the MS whitepaper, this should work */
/* on all legacy MS fonts, but creates artifacts with some. Only using */
/* where absolutely necessary. */
#define SKIP_INLINE_DELTAS_RULES_SIZE 1
SPH_TweakRule SKIP_INLINE_DELTAS_Rules
[SKIP_INLINE_DELTAS_RULES_SIZE] =
{
{ "-", 0, "", 0 },
};
/* Subpixel hinting ignores SHPIX rules on X. Force SHPIX for these. */
#define DO_SHPIX_RULES_SIZE 1
SPH_TweakRule DO_SHPIX_Rules
[DO_SHPIX_RULES_SIZE] =
{
{ "-", 0, "", 0 },
};
/* Skip Y moves that start with a point that is not on a Y pixel */
/* boundary and don't move that point to a Y pixel boundary. */
#define SKIP_NONPIXEL_Y_MOVES_RULES_SIZE 9
SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules
[SKIP_NONPIXEL_Y_MOVES_RULES_SIZE] =
{
/* fix vwxyz thinness*/
{ "Consolas", 0, "Regular", 0 },
/* fix tiny gap at top of m */
{ "Arial", 0, "Regular", 'm' },
/* Fix thin middle stems */
{ "Core MS Legacy Fonts", 0, "Regular/Bold Class", 'N' },
{ "Lucida Grande", 0, "", 'N' },
{ "Lucida Grande", 0, "Bold", 'y' },
/* Cyrillic small letter I */
{ "Legacy Sans Fonts", 0, "", 0x438 },
{ "Verdana Clones", 0, "",'N' },
{ "Ubuntu", 0, "Regular Class", 'N' },
/* Fix misshapen x */
{ "Verdana", 0, "Bold", 'x' },
};
#define SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 5
SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules_Exceptions
[SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
{
{ "Tahoma", 0, "", 'N' },
{ "Comic Sans MS", 0, "", 'N' },
{ "Verdana", 0, "Regular/Bold Class", 'N' },
{ "Verdana", 11, "Bold", 'x' },
/* Cyrillic small letter I */
{ "Arial", 0, "", 0x438 },
};
/* Skip Y moves that move a point off a Y pixel boundary. */
/* This fixes Tahoma, Trebuchet oddities and some issues with `$'. */
#define SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE 5
SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules
[SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE] =
{
{ "MS Legacy Fonts", 0, "", 0 },
{ "Apple Legacy Fonts", 0, "", 0 },
{ "Misc Legacy Fonts", 0, "", 0 },
{ "Ubuntu", 0, "Regular Class", 0 },
{ "Verdana Clones", 0, "", 0 },
};
#define SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules_Exceptions
[SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
{
{ "-", 0, "", 0 },
};
/* Round moves that don't move a point to a Y pixel boundary. */
#define ROUND_NONPIXEL_Y_MOVES_RULES_SIZE 3
SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules
[ROUND_NONPIXEL_Y_MOVES_RULES_SIZE] =
{
/* Droid font instructions don't snap Y to pixels */
{ "Droid Sans", 0, "Regular/Italic Class", 0 },
{ "Droid Sans Mono", 0, "", 0 },
{ "Ubuntu", 0, "", 0 },
};
#define ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 3
SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules_Exceptions
[ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
{
{ "Droid Sans", 12, "Bold", 0 },
{ "Droid Sans", 13, "Bold", 0 },
{ "Droid Sans", 16, "Bold", 0 },
};
/* Allow a Direct_Move_X along X freedom vector if matched. */
#define ALLOW_X_DMOVEX_RULES_SIZE 2
SPH_TweakRule ALLOW_X_DMOVEX_Rules
[ALLOW_X_DMOVEX_RULES_SIZE] =
{
/* Creates a more consistent appearance for these */
{ "Arial", 13, "Regular", 'e' },
{ "Arial", 13, "Regular", 'o' },
};
/* Allow a Direct_Move along X freedom vector if matched. */
#define ALLOW_X_DMOVE_RULES_SIZE 3
SPH_TweakRule ALLOW_X_DMOVE_Rules
[ALLOW_X_DMOVE_RULES_SIZE] =
{
/* Creates a more consistent appearance for these */
{ "Arial", 13, "Regular", 'e' },
{ "Arial", 13, "Regular", 'o' },
/* Fixes vanishing diagonal in 4 */
{ "Verdana", 0, "Regular", '4' },
};
/* Allow a ZP2 move along freedom vector if matched; */
/* This is called from SHP, SHPIX, SHC, SHZ. */
#define ALLOW_X_MOVE_ZP2_RULES_SIZE 1
SPH_TweakRule ALLOW_X_MOVE_ZP2_Rules
[ALLOW_X_MOVE_ZP2_RULES_SIZE] =
{
{ "-", 0, "", 0 },
};
/* Return MS rasterizer version 35 if matched. */
#define RASTERIZER_35_RULES_SIZE 8
SPH_TweakRule RASTERIZER_35_Rules
[RASTERIZER_35_RULES_SIZE] =
{
/* This seems to be the only way to make these look good */
{ "Times New Roman", 0, "Regular", 'i' },
{ "Times New Roman", 0, "Regular", 'j' },
{ "Times New Roman", 0, "Regular", 'm' },
{ "Times New Roman", 0, "Regular", 'r' },
{ "Times New Roman", 0, "Regular", 'a' },
{ "Times New Roman", 0, "Regular", 'n' },
{ "Times New Roman", 0, "Regular", 'p' },
{ "Times", 0, "", 0 },
};
/* Don't round to the subpixel grid. Round to pixel grid. */
#define NORMAL_ROUND_RULES_SIZE 2
SPH_TweakRule NORMAL_ROUND_Rules
[NORMAL_ROUND_RULES_SIZE] =
{
/* Fix point "explosions" */
{ "Courier New", 0, "", 0 },
{ "Verdana", 10, "Regular", '4' },
};
/* Skip IUP instructions if matched. */
#define SKIP_IUP_RULES_SIZE 1
SPH_TweakRule SKIP_IUP_Rules
[SKIP_IUP_RULES_SIZE] =
{
{ "Arial", 13, "Regular", 'a' },
};
/* Skip MIAP Twilight hack if matched. */
#define MIAP_HACK_RULES_SIZE 1
SPH_TweakRule MIAP_HACK_Rules
[MIAP_HACK_RULES_SIZE] =
{
{ "Geneva", 12, "", 0 },
};
/* Skip DELTAP instructions if matched. */
#define ALWAYS_SKIP_DELTAP_RULES_SIZE 13
SPH_TweakRule ALWAYS_SKIP_DELTAP_Rules
[ALWAYS_SKIP_DELTAP_RULES_SIZE] =
{
{ "Georgia", 0, "Regular", 'k' },
/* fixes problems with W M w */
{ "Trebuchet MS", 0, "Italic", 0 },
{ "Trebuchet MS", 14, "Regular", 'e' },
{ "Arial", 11, "Regular", 's' },
{ "Verdana", 10, "Regular", 0 },
{ "Verdana", 9, "Regular", 0 },
/* Cyrillic small letter short I */
{ "Legacy Sans Fonts", 0, "", 0x439 },
{ "Arial", 10, "Regular", '6' },
{ "Arial", 0, "Bold/BoldItalic Class", 'a' },
/* Make horizontal stems consistent with the rest */
{ "Arial", 24, "Bold", 's' },
{ "Arial", 25, "Bold", 's' },
{ "Arial", 24, "Bold", 'a' },
{ "Arial", 25, "Bold", 'a' },
};
/* Always do DELTAP instructions if matched. */
#define ALWAYS_DO_DELTAP_RULES_SIZE 2
SPH_TweakRule ALWAYS_DO_DELTAP_Rules
[ALWAYS_DO_DELTAP_RULES_SIZE] =
{
{ "Verdana Clones", 17, "Regular Class", 'K' },
{ "Verdana Clones", 17, "Regular Class", 'k' },
};
/* Do an extra RTG instruction in DELTAP if matched. */
#define DELTAP_RTG_RULES_SIZE 1
SPH_TweakRule DELTAP_RTG_Rules
[DELTAP_RTG_RULES_SIZE] =
{
{ "-", 0, "", 0 },
};
/* Force CVT distance to zero in MIRP. */
#define MIRP_CVT_ZERO_RULES_SIZE 1
SPH_TweakRule MIRP_CVT_ZERO_Rules
[MIRP_CVT_ZERO_RULES_SIZE] =
{
{ "Verdana", 0, "Regular", 0 },
};
/* Skip moves that meet or exceed 1 pixel. */
#define DELTAP_SKIP_EXAGGERATED_VALUES_RULES_SIZE 2
SPH_TweakRule DELTAP_SKIP_EXAGGERATED_VALUES_Rules
[DELTAP_SKIP_EXAGGERATED_VALUES_RULES_SIZE] =
{
/* Fix vanishing stems */
{ "Ubuntu", 0, "Regular", 'M' },
/* Fix X at larger ppems */
{ "Segoe UI", 0, "Light", 0 },
};
/* Don't allow ALIGNRP after IUP. */
#define NO_ALIGNRP_AFTER_IUP_RULES_SIZE 4
SPH_TweakRule NO_ALIGNRP_AFTER_IUP_Rules
[NO_ALIGNRP_AFTER_IUP_RULES_SIZE] =
{
/* Prevent creation of dents in outline */
{ "Courier New", 0, "Bold", 'C' },
{ "Courier New", 0, "Bold", 'D' },
{ "Courier New", 0, "Bold", 'Q' },
{ "Courier New", 0, "Bold", '0' },
};
/* Don't allow DELTAP after IUP. */
#define NO_DELTAP_AFTER_IUP_RULES_SIZE 2
SPH_TweakRule NO_DELTAP_AFTER_IUP_Rules
[NO_DELTAP_AFTER_IUP_RULES_SIZE] =
{
{ "Arial", 0, "Bold", 'N' },
{ "Verdana", 0, "Regular", '4' },
};
/* Don't allow CALL after IUP. */
#define NO_CALL_AFTER_IUP_RULES_SIZE 4
SPH_TweakRule NO_CALL_AFTER_IUP_Rules
[NO_CALL_AFTER_IUP_RULES_SIZE] =
{
/* Prevent creation of dents in outline */
{ "Courier New", 0, "Bold", 'O' },
{ "Courier New", 0, "Bold", 'Q' },
{ "Courier New", 0, "Bold", 'k' },
{ "Courier New", 0, "Bold Italic", 'M' },
};
/* De-embolden these glyphs slightly. */
#define DEEMBOLDEN_RULES_SIZE 9
SPH_TweakRule DEEMBOLDEN_Rules
[DEEMBOLDEN_RULES_SIZE] =
{
{ "Courier New", 0, "Bold", 'A' },
{ "Courier New", 0, "Bold", 'W' },
{ "Courier New", 0, "Bold", 'w' },
{ "Courier New", 0, "Bold", 'M' },
{ "Courier New", 0, "Bold", 'X' },
{ "Courier New", 0, "Bold", 'K' },
{ "Courier New", 0, "Bold", 'x' },
{ "Courier New", 0, "Bold", 'z' },
{ "Courier New", 0, "Bold", 'v' },
};
/* Embolden these glyphs slightly. */
#define EMBOLDEN_RULES_SIZE 5
SPH_TweakRule EMBOLDEN_Rules
[EMBOLDEN_RULES_SIZE] =
{
{ "Courier New", 12, "Italic", 'z' },
{ "Courier New", 11, "Italic", 'z' },
{ "Courier New", 10, "Italic", 'z' },
{ "Courier New", 0, "Regular", 0 },
{ "Courier New", 0, "Italic", 0 },
};
/* Do an extra RDTG instruction in DELTAP if matched. */
#define DELTAP_RDTG_RULES_SIZE 1
SPH_TweakRule DELTAP_RDTG_Rules
[DELTAP_RDTG_RULES_SIZE] =
{
{ "-", 0, "", 0 },
};
/* This is a CVT hack that makes thick horizontal stems on 2, 5, 7 */
/* similar to Windows XP. */
#define TIMES_NEW_ROMAN_HACK_RULES_SIZE 12
SPH_TweakRule TIMES_NEW_ROMAN_HACK_Rules
[TIMES_NEW_ROMAN_HACK_RULES_SIZE] =
{
{ "Times New Roman", 16, "Italic", '2' },
{ "Times New Roman", 16, "Italic", '5' },
{ "Times New Roman", 16, "Italic", '7' },
{ "Times New Roman", 16, "Regular", '2' },
{ "Times New Roman", 16, "Regular", '5' },
{ "Times New Roman", 16, "Regular", '7' },
{ "Times New Roman", 17, "Italic", '2' },
{ "Times New Roman", 17, "Italic", '5' },
{ "Times New Roman", 17, "Italic", '7' },
{ "Times New Roman", 17, "Regular", '2' },
{ "Times New Roman", 17, "Regular", '5' },
{ "Times New Roman", 17, "Regular", '7' },
};
/* This fudges distance on 2 to get rid of the vanishing stem issue. */
/* A real solution to this is certainly welcome. */
#define COURIER_NEW_2_HACK_RULES_SIZE 15
SPH_TweakRule COURIER_NEW_2_HACK_Rules
[COURIER_NEW_2_HACK_RULES_SIZE] =
{
{ "Courier New", 10, "Regular", '2' },
{ "Courier New", 11, "Regular", '2' },
{ "Courier New", 12, "Regular", '2' },
{ "Courier New", 13, "Regular", '2' },
{ "Courier New", 14, "Regular", '2' },
{ "Courier New", 15, "Regular", '2' },
{ "Courier New", 16, "Regular", '2' },
{ "Courier New", 17, "Regular", '2' },
{ "Courier New", 18, "Regular", '2' },
{ "Courier New", 19, "Regular", '2' },
{ "Courier New", 20, "Regular", '2' },
{ "Courier New", 21, "Regular", '2' },
{ "Courier New", 22, "Regular", '2' },
{ "Courier New", 23, "Regular", '2' },
{ "Courier New", 24, "Regular", '2' },
};
#ifndef FORCE_NATURAL_WIDTHS
/* Use compatible widths with these glyphs. Compatible widths is always */
/* on when doing B/W TrueType instructing, but is used selectively here, */
/* typically on glyphs with 3 or more vertical stems. */
#define COMPATIBLE_WIDTHS_RULES_SIZE 36
SPH_TweakRule COMPATIBLE_WIDTHS_Rules
[COMPATIBLE_WIDTHS_RULES_SIZE] =
{
{ "Arial Unicode MS", 12, "Regular Class", 'm' },
{ "Arial Unicode MS", 14, "Regular Class", 'm' },
/* Cyrillic small letter sha */
{ "Arial", 10, "Regular Class", 0x448 },
{ "Arial", 11, "Regular Class", 'm' },
{ "Arial", 12, "Regular Class", 'm' },
/* Cyrillic small letter sha */
{ "Arial", 12, "Regular Class", 0x448 },
{ "Arial", 13, "Regular Class", 0x448 },
{ "Arial", 14, "Regular Class", 'm' },
/* Cyrillic small letter sha */
{ "Arial", 14, "Regular Class", 0x448 },
{ "Arial", 15, "Regular Class", 0x448 },
{ "Arial", 17, "Regular Class", 'm' },
{ "DejaVu Sans", 15, "Regular Class", 0 },
{ "Microsoft Sans Serif", 11, "Regular Class", 0 },
{ "Microsoft Sans Serif", 12, "Regular Class", 0 },
{ "Segoe UI", 11, "Regular Class", 0 },
{ "Segoe UI", 12, "Regular Class", 'm' },
{ "Segoe UI", 14, "Regular Class", 'm' },
{ "Tahoma", 11, "Regular Class", 0 },
{ "Times New Roman", 16, "Regular Class", 'c' },
{ "Times New Roman", 16, "Regular Class", 'm' },
{ "Times New Roman", 16, "Regular Class", 'o' },
{ "Times New Roman", 16, "Regular Class", 'w' },
{ "Trebuchet MS", 12, "Regular Class", 0 },
{ "Trebuchet MS", 14, "Regular Class", 0 },
{ "Trebuchet MS", 15, "Regular Class", 0 },
{ "Ubuntu", 12, "Regular Class", 'm' },
/* Cyrillic small letter sha */
{ "Verdana", 10, "Regular Class", 0x448 },
{ "Verdana", 11, "Regular Class", 0x448 },
{ "Verdana and Clones", 12, "Regular Class", 'm' },
{ "Verdana and Clones", 12, "Regular Class", 'l' },
{ "Verdana and Clones", 12, "Regular Class", 'i' },
{ "Verdana and Clones", 12, "Regular Class", 'j' },
{ "Verdana and Clones", 13, "Regular Class", 'l' },
{ "Verdana and Clones", 13, "Regular Class", 'i' },
{ "Verdana and Clones", 13, "Regular Class", 'j' },
{ "Verdana and Clones", 14, "Regular Class", 'm' },
};
/* Scaling slightly in the x-direction prior to hinting results in */
/* more visually pleasing glyphs in certain cases. */
/* This sometimes needs to be coordinated with compatible width rules. */
/* A value of 1000 corresponds to a scaled value of 1.0. */
#define X_SCALING_RULES_SIZE 40
SPH_ScaleRule X_SCALING_Rules
[X_SCALING_RULES_SIZE] =
{
{ "DejaVu Sans", 12, "Regular Class", 'm', 950 },
{ "Verdana and Clones", 12, "Regular Class", 'a', 1000 },
{ "Arial", 11, "Regular Class", 'm', 975 },
{ "Arial", 12, "Regular Class", 'm', 1050 },
/* Cyrillic small letter el */
{ "Arial", 13, "Regular Class", 0x43B, 950 },
{ "Arial", 14, "Regular Class", 'm', 950 },
/* Cyrillic small letter el */
{ "Arial", 15, "Regular Class", 0x43B, 925 },
{ "Bitstream Vera Sans", 10, "Regular/Italic Class", 0, 1100 },
{ "Bitstream Vera Sans", 12, "Regular/Italic Class", 0, 1050 },
{ "Bitstream Vera Sans", 16, "Regular Class", 0, 1050 },
{ "Bitstream Vera Sans", 9, "Regular/Italic Class", 0, 1050 },
{ "DejaVu Sans", 12, "Regular Class", 'l', 975 },
{ "DejaVu Sans", 12, "Regular Class", 'i', 975 },
{ "DejaVu Sans", 12, "Regular Class", 'j', 975 },
{ "DejaVu Sans", 13, "Regular Class", 'l', 950 },
{ "DejaVu Sans", 13, "Regular Class", 'i', 950 },
{ "DejaVu Sans", 13, "Regular Class", 'j', 950 },
{ "DejaVu Sans", 10, "Regular/Italic Class", 0, 1100 },
{ "DejaVu Sans", 12, "Regular/Italic Class", 0, 1050 },
{ "Georgia", 10, "", 0, 1050 },
{ "Georgia", 11, "", 0, 1100 },
{ "Georgia", 12, "", 0, 1025 },
{ "Georgia", 13, "", 0, 1050 },
{ "Georgia", 16, "", 0, 1050 },
{ "Georgia", 17, "", 0, 1030 },
{ "Liberation Sans", 12, "Regular Class", 'm', 1100 },
{ "Lucida Grande", 11, "Regular Class", 'm', 1100 },
{ "Microsoft Sans Serif", 11, "Regular Class", 'm', 950 },
{ "Microsoft Sans Serif", 12, "Regular Class", 'm', 1050 },
{ "Segoe UI", 12, "Regular Class", 'H', 1050 },
{ "Segoe UI", 12, "Regular Class", 'm', 1050 },
{ "Segoe UI", 14, "Regular Class", 'm', 1050 },
{ "Tahoma", 11, "Regular Class", 'm', 975 },
{ "Verdana", 10, "Regular/Italic Class", 0, 1100 },
{ "Verdana", 12, "Regular Class", 'm', 975 },
{ "Verdana", 12, "Regular/Italic Class", 0, 1050 },
{ "Verdana", 16, "Regular Class", 0, 1050 },
{ "Verdana", 9, "Regular/Italic Class", 0, 1050 },
{ "Times New Roman", 16, "Regular Class", 'm', 950 },
{ "Trebuchet MS", 12, "Regular Class", 'm', 950 },
};
#else
#define COMPATIBLE_WIDTHS_RULES_SIZE 1
SPH_TweakRule COMPATIBLE_WIDTHS_Rules
[COMPATIBLE_WIDTHS_RULES_SIZE] =
{
{ "-", 0, "", 0 },
};
#define X_SCALING_RULES_SIZE 1
SPH_ScaleRule X_SCALING_Rules
[X_SCALING_RULES_SIZE] =
{
{ "-", 0, "", 0, 1000 },
};
#endif /* FORCE_NATURAL_WIDTHS */
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
FT_END_HEADER
#endif /* __TTSUBPIX_H__ */
/* END */