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Remove unpatented hinter (3/3).

Browse Source 
* include/freetype/config/ftoption.h
(TT_CONFIG_OPTION_UNPATENTED_HINTING): Remove.

* include/freetype/internal/ftobjs.h (FT_Face_InternalRec): Remove
`ignore_unpatented_hinter' field.
Update users.
(FT_DEBUG_HOOK_UNPATENTED_HINTING): Remove.
Update users.

* include/freetype/internal/tttypes.h (TT_FaceRec): Remove
`unpatented_hinting' field.
Update users.

* src/base/ftpatent.c (_tt_check_patents_in_range,
_tt_check_patents_in_table, _tt_face_check_patents): Remove.
(FT_Face_CheckTrueTypePatents, FT_Face_SetUnpatentedHinting):
Replace code with dummies.

* src/truetype/ttobjs.c (tt_face_init): Remove now defunct code.
* src/truetype/ttobjs.h (TT_GraphicsState): Remove `both_x_axis'
field.
2.6.5
Nikolaus Waxweiler 9 years ago committed by Werner Lemberg
parent 5b7871be12
commit 1d8d0b4ef9
14 changed files with 46 additions and 383 deletions
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  1. 26
      ChangeLog
  2. 5
      include/freetype/config/ftheader.h
  3. 57
      include/freetype/config/ftoption.h
  4. 19
      include/freetype/freetype.h
  5. 7
      include/freetype/ftmodapi.h
  6. 14
      include/freetype/internal/ftobjs.h
  7. 7
      include/freetype/internal/tttypes.h
  8. 11
      include/freetype/ttunpat.h
  9. 1
      src/base/ftobjs.c
  10. 244
      src/base/ftpatent.c
  11. 4
      src/truetype/ttdriver.c
  12. 27
      src/truetype/ttobjs.c
  13. 4
      src/truetype/ttobjs.h
  14. 3
      src/type42/t42objs.c

26
ChangeLog
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@ -1,3 +1,29 @@
2016-01-28 Nikolaus Waxweiler <madigens@gmail.com>
Remove unpatented hinter (3/3).
* include/freetype/config/ftoption.h
(TT_CONFIG_OPTION_UNPATENTED_HINTING): Remove.
* include/freetype/internal/ftobjs.h (FT_Face_InternalRec): Remove
`ignore_unpatented_hinter' field.
Update users.
(FT_DEBUG_HOOK_UNPATENTED_HINTING): Remove.
Update users.
* include/freetype/internal/tttypes.h (TT_FaceRec): Remove
`unpatented_hinting' field.
Update users.
* src/base/ftpatent.c (_tt_check_patents_in_range,
_tt_check_patents_in_table, _tt_face_check_patents): Remove.
(FT_Face_CheckTrueTypePatents, FT_Face_SetUnpatentedHinting):
Replace code with dummies.
* src/truetype/ttobjs.c (tt_face_init): Remove now defunct code.
* src/truetype/ttobjs.h (TT_GraphicsState): Remove `both_x_axis'
field.
2016-01-28 Nikolaus Waxweiler <madigens@gmail.com>
Remove unpatented hinter (2/3).

5
include/freetype/config/ftheader.h
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@ -753,8 +753,7 @@
* FT_UNPATENTED_HINTING_H
*
* @description:
* A macro used in #include statements to name the file containing the
* FreeType~2 API which performs color filtering for subpixel rendering.
* Deprecated.
*/
#define FT_UNPATENTED_HINTING_H <freetype/ttunpat.h>
@ -766,7 +765,7 @@
*
* @description:
* A macro used in #include statements to name the file containing the
* FreeType~2 API which performs color filtering for subpixel rendering.
* FreeType~2 API which performs incremental glyph loading.
*/
#define FT_INCREMENTAL_H <freetype/ftincrem.h>

57
include/freetype/config/ftoption.h
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@ -605,56 +605,6 @@ FT_BEGIN_HEADER
/* #define TT_CONFIG_OPTION_SUBPIXEL_HINTING */
/*************************************************************************/
/* */
/* If you define TT_CONFIG_OPTION_UNPATENTED_HINTING, a special version */
/* of the TrueType bytecode interpreter is used that doesn't implement */
/* any of the patented opcodes and algorithms. The patents related to */
/* TrueType hinting have expired worldwide since May 2010; this option */
/* is now deprecated. */
/* */
/* Note that the TT_CONFIG_OPTION_UNPATENTED_HINTING macro is *ignored* */
/* if you define TT_CONFIG_OPTION_BYTECODE_INTERPRETER; in other words, */
/* either define TT_CONFIG_OPTION_BYTECODE_INTERPRETER or */
/* TT_CONFIG_OPTION_UNPATENTED_HINTING but not both at the same time. */
/* */
/* This macro is only useful for a small number of font files (mostly */
/* for Asian scripts) that require bytecode interpretation to properly */
/* load glyphs. For all other fonts, this produces unpleasant results, */
/* thus the unpatented interpreter is never used to load glyphs from */
/* TrueType fonts unless one of the following two options is used. */
/* */
/* - The unpatented interpreter is explicitly activated by the user */
/* through the FT_PARAM_TAG_UNPATENTED_HINTING parameter tag */
/* when opening the FT_Face. */
/* */
/* - FreeType detects that the FT_Face corresponds to one of the */
/* `trick' fonts (e.g., `Mingliu') it knows about. The font engine */
/* contains a hard-coded list of font names and other matching */
/* parameters (see function `tt_face_init' in file */
/* `src/truetype/ttobjs.c'). */
/* */
/* Here a sample code snippet for using FT_PARAM_TAG_UNPATENTED_HINTING. */
/* */
/* { */
/* FT_Parameter parameter; */
/* FT_Open_Args open_args; */
/* */
/* */
/* parameter.tag = FT_PARAM_TAG_UNPATENTED_HINTING; */
/* */
/* open_args.flags = FT_OPEN_PATHNAME | FT_OPEN_PARAMS; */
/* open_args.pathname = my_font_pathname; */
/* open_args.num_params = 1; */
/* open_args.params = &parameter; */
/* */
/* error = FT_Open_Face( library, &open_args, index, &face ); */
/* ... */
/* } */
/* */
/* #define TT_CONFIG_OPTION_UNPATENTED_HINTING */
/*************************************************************************/
/* */
/* Define TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED to compile the */
@ -856,14 +806,11 @@ FT_BEGIN_HEADER
/*
* This macro is defined if either unpatented or native TrueType
* hinting is requested by the definitions above.
* This macro is defined if native TrueType hinting is requested by the
* definitions above.
*/
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
#define TT_USE_BYTECODE_INTERPRETER
#undef TT_CONFIG_OPTION_UNPATENTED_HINTING
#elif defined TT_CONFIG_OPTION_UNPATENTED_HINTING
#define TT_USE_BYTECODE_INTERPRETER
#endif

19
include/freetype/freetype.h
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@ -4217,20 +4217,13 @@ FT_BEGIN_HEADER
/* FT_Face_CheckTrueTypePatents */
/* */
/* <Description> */
/* Parse all bytecode instructions of a TrueType font file to check */
/* whether any of the patented opcodes are used. This is only useful */
/* if you want to be able to use the unpatented hinter with */
/* fonts that do *not* use these opcodes. */
/* */
/* Note that this function parses *all* glyph instructions in the */
/* font file, which may be slow. */
/* Deprecated, does nothing. */
/* */
/* <Input> */
/* face :: A face handle. */
/* */
/* <Return> */
/* 1~if this is a TrueType font that uses one of the patented */
/* opcodes, 0~otherwise. */
/* Always returns false. */
/* */
/* <Note> */
/* Since May 2010, TrueType hinting is no longer patented. */
@ -4248,9 +4241,7 @@ FT_BEGIN_HEADER
/* FT_Face_SetUnpatentedHinting */
/* */
/* <Description> */
/* Enable or disable the unpatented hinter for a given face. */
/* Only enable it if you have determined that the face doesn't */
/* use any patented opcodes (see @FT_Face_CheckTrueTypePatents). */
/* Deprecated, does nothing. */
/* */
/* <Input> */
/* face :: A face handle. */
@ -4258,9 +4249,7 @@ FT_BEGIN_HEADER
/* value :: New boolean setting. */
/* */
/* <Return> */
/* The old setting value. This will always be false if this is not */
/* an SFNT font, or if the unpatented hinter is not compiled in this */
/* instance of the library. */
/* Always returns false. */
/* */
/* <Note> */
/* Since May 2010, TrueType hinting is no longer patented. */

7
include/freetype/ftmodapi.h
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@ -613,12 +613,7 @@ FT_BEGIN_HEADER
* The library doesn't implement any kind of bytecode interpreter.
*
* FT_TRUETYPE_ENGINE_TYPE_UNPATENTED ::
* The library implements a bytecode interpreter that doesn't
* support the patented operations of the TrueType virtual machine.
*
* Its main use is to load certain Asian fonts that position and
* scale glyph components with bytecode instructions. It produces
* bad output for most other fonts.
* Deprecated and removed.
*
* FT_TRUETYPE_ENGINE_TYPE_PATENTED ::
* The library implements a bytecode interpreter that covers

14
include/freetype/internal/ftobjs.h
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@ -341,12 +341,6 @@ FT_BEGIN_HEADER
/* this data when first opened. This field exists only if */
/* @FT_CONFIG_OPTION_INCREMENTAL is defined. */
/* */
/* ignore_unpatented_hinter :: */
/* This boolean flag instructs the glyph loader to ignore the */
/* native font hinter, if one is found. This is exclusively used */
/* in the case when the unpatented hinter is compiled within the */
/* library. */
/* */
/* refcount :: */
/* A counter initialized to~1 at the time an @FT_Face structure is */
/* created. @FT_Reference_Face increments this counter, and */
@ -365,7 +359,6 @@ FT_BEGIN_HEADER
FT_Incremental_InterfaceRec* incremental_interface;
#endif
FT_Bool ignore_unpatented_hinter;
FT_Int refcount;
} FT_Face_InternalRec;
@ -775,13 +768,6 @@ FT_BEGIN_HEADER
#define FT_DEBUG_HOOK_TRUETYPE 0
/* Set this debug hook to a non-null pointer to force unpatented hinting */
/* for all faces when both TT_USE_BYTECODE_INTERPRETER and */
/* TT_CONFIG_OPTION_UNPATENTED_HINTING are defined. This is only used */
/* during debugging. */
#define FT_DEBUG_HOOK_UNPATENTED_HINTING 1
typedef void (*FT_Bitmap_LcdFilterFunc)( FT_Bitmap* bitmap,
FT_Render_Mode render_mode,
FT_Library library );

7
include/freetype/internal/tttypes.h
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@ -1233,9 +1233,6 @@ FT_BEGIN_HEADER
/* interpreters field is also used to hook */
/* the debugger in `ttdebug'. */
/* */
/* unpatented_hinting :: If true, use only unpatented methods in */
/* the bytecode interpreter. */
/* */
/* doblend :: A boolean which is set if the font should */
/* be blended (this is for GX var). */
/* */
@ -1334,10 +1331,6 @@ FT_BEGIN_HEADER
/* used to hook the debugger for the `ttdebug' utility. */
TT_Interpreter interpreter;
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
/* Use unpatented hinting only. */
FT_Bool unpatented_hinting;
#endif
/***********************************************************************/
/* */

11
include/freetype/ttunpat.h
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@ -2,7 +2,8 @@
/* */
/* ttunpat.h */
/* */
/* Definitions for the unpatented TrueType hinting system */
/* Definitions for the unpatented TrueType hinting system. */
/* Obsolete, retained for backwards compatibility. */
/* */
/* Copyright 2003-2016 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
@ -41,9 +42,11 @@ FT_BEGIN_HEADER
* FT_PARAM_TAG_UNPATENTED_HINTING
*
* @description:
* A constant used as the tag of an @FT_Parameter structure to indicate
* that unpatented methods only should be used by the TrueType bytecode
* interpreter for a typeface opened by @FT_Open_Face.
* Deprecated.
*
* Previously: A constant used as the tag of an @FT_Parameter structure to
* indicate that unpatented methods only should be used by the TrueType
* bytecode interpreter for a typeface opened by @FT_Open_Face.
*
*/
#define FT_PARAM_TAG_UNPATENTED_HINTING FT_MAKE_TAG( 'u', 'n', 'p', 'a' )

1
src/base/ftobjs.c
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@ -688,7 +688,6 @@
/* both `fpgm' and `prep' tables are missing */
if ( ( mode == FT_RENDER_MODE_LIGHT &&
!FT_DRIVER_HINTS_LIGHTLY( driver ) ) ||
face->internal->ignore_unpatented_hinter ||
( FT_IS_SFNT( face ) &&
ttface->num_locations &&
ttface->max_profile.maxSizeOfInstructions == 0 &&

244
src/base/ftpatent.c
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@ -3,7 +3,7 @@
/* ftpatent.c */
/* */
/* FreeType API for checking patented TrueType bytecode instructions */
/* (body). */
/* (body). Obsolete, retained for backwards compatibility. */
/* */
/* Copyright 2007-2016 by */
/* David Turner. */
@ -25,238 +25,14 @@
#include FT_SERVICE_TRUETYPE_GLYF_H
static FT_Bool
_tt_check_patents_in_range( FT_Stream stream,
FT_ULong size )
{
FT_Bool result = FALSE;
FT_Error error;
FT_Bytes p, end;
if ( FT_FRAME_ENTER( size ) )
return 0;
p = stream->cursor;
end = p + size;
while ( p < end )
{
switch (p[0])
{
case 0x06: /* SPvTL // */
case 0x07: /* SPvTL + */
case 0x08: /* SFvTL // */
case 0x09: /* SFvTL + */
case 0x0A: /* SPvFS */
case 0x0B: /* SFvFS */
result = TRUE;
goto Exit;
case 0x40:
if ( p + 1 >= end )
goto Exit;
p += p[1] + 2;
break;
case 0x41:
if ( p + 1 >= end )
goto Exit;
p += p[1] * 2 + 2;
break;
case 0x71: /* DELTAP2 */
case 0x72: /* DELTAP3 */
case 0x73: /* DELTAC0 */
case 0x74: /* DELTAC1 */
case 0x75: /* DELTAC2 */
result = TRUE;
goto Exit;
case 0xB0:
case 0xB1:
case 0xB2:
case 0xB3:
case 0xB4:
case 0xB5:
case 0xB6:
case 0xB7:
p += ( p[0] - 0xB0 ) + 2;
break;
case 0xB8:
case 0xB9:
case 0xBA:
case 0xBB:
case 0xBC:
case 0xBD:
case 0xBE:
case 0xBF:
p += ( p[0] - 0xB8 ) * 2 + 3;
break;
default:
p += 1;
break;
}
}
Exit:
FT_UNUSED( error );
FT_FRAME_EXIT();
return result;
}
static FT_Bool
_tt_check_patents_in_table( FT_Face face,
FT_ULong tag )
{
FT_Stream stream = face->stream;
FT_Error error = FT_Err_Ok;
FT_Service_SFNT_Table service;
FT_Bool result = FALSE;
FT_FACE_FIND_SERVICE( face, service, SFNT_TABLE );
if ( service )
{
FT_UInt i = 0;
FT_ULong tag_i = 0, offset_i = 0, length_i = 0;
for ( i = 0; !error && tag_i != tag ; i++ )
error = service->table_info( face, i,
&tag_i, &offset_i, &length_i );
if ( error ||
FT_STREAM_SEEK( offset_i ) )
goto Exit;
result = _tt_check_patents_in_range( stream, length_i );
}
Exit:
return result;
}
static FT_Bool
_tt_face_check_patents( FT_Face face )
{
FT_Stream stream = face->stream;
FT_UInt gindex;
FT_Error error;
FT_Bool result;
FT_Service_TTGlyf service;
result = _tt_check_patents_in_table( face, TTAG_fpgm );
if ( result )
goto Exit;
result = _tt_check_patents_in_table( face, TTAG_prep );
if ( result )
goto Exit;
FT_FACE_FIND_SERVICE( face, service, TT_GLYF );
if ( service == NULL )
goto Exit;
for ( gindex = 0; gindex < (FT_UInt)face->num_glyphs; gindex++ )
{
FT_ULong offset, num_ins, size;
FT_Int num_contours;
offset = service->get_location( face, gindex, &size );
if ( size == 0 )
continue;
if ( FT_STREAM_SEEK( offset ) ||
FT_READ_SHORT( num_contours ) )
continue;
if ( num_contours >= 0 ) /* simple glyph */
{
if ( FT_STREAM_SKIP( 8 + num_contours * 2 ) )
continue;
}
else /* compound glyph */
{
FT_Bool has_instr = 0;
if ( FT_STREAM_SKIP( 8 ) )
continue;
/* now read each component */
for (;;)
{
FT_UInt flags, toskip;
if( FT_READ_USHORT( flags ) )
break;
toskip = 2 + 1 + 1;
if ( ( flags & ( 1 << 0 ) ) != 0 ) /* ARGS_ARE_WORDS */
toskip += 2;
if ( ( flags & ( 1 << 3 ) ) != 0 ) /* WE_HAVE_A_SCALE */
toskip += 2;
else if ( ( flags & ( 1 << 6 ) ) != 0 ) /* WE_HAVE_X_Y_SCALE */
toskip += 4;
else if ( ( flags & ( 1 << 7 ) ) != 0 ) /* WE_HAVE_A_2x2 */
toskip += 8;
if ( ( flags & ( 1 << 8 ) ) != 0 ) /* WE_HAVE_INSTRUCTIONS */
has_instr = 1;
if ( FT_STREAM_SKIP( toskip ) )
goto NextGlyph;
if ( ( flags & ( 1 << 5 ) ) == 0 ) /* MORE_COMPONENTS */
break;
}
if ( !has_instr )
goto NextGlyph;
}
if ( FT_READ_USHORT( num_ins ) )
continue;
result = _tt_check_patents_in_range( stream, num_ins );
if ( result )
goto Exit;
NextGlyph:
;
}
Exit:
return result;
}
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Bool )
FT_Face_CheckTrueTypePatents( FT_Face face )
{
FT_Bool result = FALSE;
if ( face && FT_IS_SFNT( face ) )
result = _tt_face_check_patents( face );
FT_UNUSED( face );
return result;
return FALSE;
}
@ -266,22 +42,10 @@
FT_Face_SetUnpatentedHinting( FT_Face face,
FT_Bool value )
{
FT_Bool result = FALSE;
#if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING ) && \
!defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER )
if ( face && FT_IS_SFNT( face ) )
{
result = !face->internal->ignore_unpatented_hinter;
face->internal->ignore_unpatented_hinter = !value;
}
#else
FT_UNUSED( face );
FT_UNUSED( value );
#endif
return result;
return FALSE;
}
/* END */

4
src/truetype/ttdriver.c
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@ -429,11 +429,7 @@
{
#ifdef TT_USE_BYTECODE_INTERPRETER
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
FT_TRUETYPE_ENGINE_TYPE_UNPATENTED
#else
FT_TRUETYPE_ENGINE_TYPE_PATENTED
#endif
#else /* !TT_USE_BYTECODE_INTERPRETER */

27
src/truetype/ttobjs.c
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@ -32,10 +32,6 @@
#include "ttinterp.h"
#endif
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
#include FT_TRUETYPE_UNPATENTED_H
#endif
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include "ttgxvar.h"
#endif
@ -681,29 +677,6 @@
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
#if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING ) && \
!defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER )
{
FT_Bool unpatented_hinting;
int i;
/* Determine whether unpatented hinting is to be used for this face. */
unpatented_hinting = FT_BOOL
( library->debug_hooks[FT_DEBUG_HOOK_UNPATENTED_HINTING] != NULL );
for ( i = 0; i < num_params && !face->unpatented_hinting; i++ )
if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING )
unpatented_hinting = TRUE;
if ( !unpatented_hinting )
ttface->internal->ignore_unpatented_hinter = TRUE;
}
#endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING &&
!TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
/* initialize standard glyph loading routines */
TT_Init_Glyph_Loading( face );

4
src/truetype/ttobjs.h
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@ -72,10 +72,6 @@ FT_BEGIN_HEADER
FT_UnitVector projVector;
FT_UnitVector freeVector;
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
FT_Bool both_x_axis;
#endif
FT_Long loop;
FT_F26Dot6 minimum_distance;
FT_Int round_state;

3
src/type42/t42objs.c
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@ -231,9 +231,6 @@
if ( info->is_fixed_pitch )
root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
/* We only set this flag if we have the patented bytecode interpreter. */
/* There are no known `tricky' Type42 fonts that could be loaded with */
/* the unpatented interpreter. */
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
root->face_flags |= FT_FACE_FLAG_HINTER;
#endif

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