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freetype2
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Code Issues 9 Releases Wiki Activity

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.
This commit is contained in:
Nikolaus Waxweiler 2016-01-28 14:11:14 +01:00 committed by Werner Lemberg
parent 5b7871be12
commit 1d8d0b4ef9
14 changed files with 46 additions and 383 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
ChangeLog
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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;
FT_UNUSED( face );
if ( face && FT_IS_SFNT( face ) )
result = _tt_face_check_patents( 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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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