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* include/freetype/internal/ftobjs.h, src/base/ftobjs.c, 

src/truetype/ttobjs.c: fixes related to the unpatented hinter
This commit is contained in:
David Turner 2006-10-01 00:09:35 +00:00
parent 9884faed9d
commit df430e1a20
4 changed files with 80 additions and 54 deletions
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4
ChangeLog
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@ -1,5 +1,7 @@
2006-09-30 Werner Lemberg <wl@gnu.org>
* include/freetype/internal/ftobjs.h, src/base/ftobjs.c,
src/truetype/ttobjs.c: fixes related to the unpatented hinter
* src/base/rules.mk (BASE_SRC): Remove `ftapi.c' (which is no longer
in use).

12
include/freetype/internal/ftobjs.h
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@ -211,11 +211,11 @@ FT_BEGIN_HEADER
/* this data when first opened. This field exists only if */
/* @FT_CONFIG_OPTION_INCREMENTAL is defined. */
/* */
/* unpatented_hinting :: */
/* This boolean flag instructs the glyph loader that this font */
/* can only be loaded through the unpatented bytecode interpreter. */
/* In that case, the auto-hinter is never called for it, except if */
/* you use FT_LOAD_FORCE_AUTOHINT. */
/* 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. */
/* */
typedef struct FT_Face_InternalRec_
{
@ -233,7 +233,7 @@ FT_BEGIN_HEADER
FT_Incremental_InterfaceRec* incremental_interface;
#endif
FT_Bool unpatented_hinting;
FT_Bool ignore_unpatented_hinter;
} FT_Face_InternalRec;

52
src/base/ftobjs.c
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@ -573,23 +573,45 @@
load_flags &= ~FT_LOAD_RENDER;
}
if ( FT_LOAD_TARGET_MODE( load_flags ) == FT_RENDER_MODE_LIGHT )
load_flags |= FT_LOAD_FORCE_AUTOHINT;
/* determine wether we need to auto-hint or not
* the general rules are:
*
* - only auto-hint if we have a hinter module, a
* scalable font format dealing with outlines,
* no transforms except simple slants
*
* - then, autohint if FT_LOAD_FORCE_AUTOHINT is set
* or if we don't have a native font hinter
*
* - otherwise, autohint for LIGHT hinting mode
*
* - except if the font requires the unpatented
* bytecode interpreter to load properly
*/
/* auto-hinter is preferred and should be used */
if ( ( !FT_DRIVER_HAS_HINTER( driver ) ||
( load_flags & FT_LOAD_FORCE_AUTOHINT ) ) &&
!( load_flags & FT_LOAD_NO_HINTING ) &&
!( load_flags & FT_LOAD_NO_AUTOHINT ) )
autohint = 0;
if ( hinter &&
(load_flags & FT_LOAD_NO_HINTING) == 0 &&
(load_flags & FT_LOAD_NO_AUTOHINT) == 0 &&
FT_DRIVER_IS_SCALABLE( driver ) &&
FT_DRIVER_USES_OUTLINES( driver ) &&
face->internal->transform_matrix.yy > 0 &&
face->internal->transform_matrix.yx == 0 )
{
/* check whether it works for this face */
autohint =
FT_BOOL( hinter &&
FT_DRIVER_IS_SCALABLE( driver ) &&
FT_DRIVER_USES_OUTLINES( driver ) &&
face->internal->transform_matrix.yy > 0 &&
face->internal->transform_matrix.yx == 0 &&
!face->internal->unpatented_hinting );
if ( (load_flags & FT_LOAD_FORCE_AUTOHINT) != 0 ||
!FT_DRIVER_HAS_HINTER( driver ) )
autohint = 1;
else
{
FT_Render_Mode mode = FT_LOAD_TARGET_MODE(load_flags);
if ( mode == FT_RENDER_MODE_LIGHT ||
face->internal->ignore_unpatented_hinter )
{
autohint = 1;
}
}
}
if ( autohint )

66
src/truetype/ttobjs.c
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@ -246,51 +246,53 @@
}
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
/* Determine whether unpatented hinting is to be used for this face. */
face->unpatented_hinting = FT_BOOL
( library->debug_hooks[ FT_DEBUG_HOOK_UNPATENTED_HINTING ] != NULL );
#if defined(TT_CONFIG_OPTION_UNPATENTED_HINTING) && \
!defined(TT_CONFIG_OPTION_BYTECODE_INTERPRETER)
{
int i;
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 )
face->unpatented_hinting = TRUE;
}
unpatented_hinting = TRUE;
/* Compare the face with a list of well-known `tricky' fonts. */
/* This list shall be expanded as we find more of them. */
if ( !face->unpatented_hinting )
{
static const char* const trick_names[] =
/* Compare the face with a list of well-known `tricky' fonts. */
/* This list shall be expanded as we find more of them. */
if ( !unpatented_hinting )
{
"DFKaiSho-SB", /* dfkaisb.ttf */
"DFKai-SB", /* kaiu.ttf */
"HuaTianSongTi?", /* htst3.ttf */
"MingLiU", /* mingliu.ttf & mingliu.ttc */
"PMingLiU", /* mingliu.ttc */
"MingLi43", /* mingli.ttf */
NULL
};
int nn;
/* Note that we only check the face name at the moment; it might */
/* be worth to do more checks for a few special cases. */
for ( nn = 0; trick_names[nn] != NULL; nn++ )
{
if ( ft_strcmp( ttface->family_name, trick_names[nn] ) == 0 )
static const char* const trick_names[] =
{
face->unpatented_hinting = 1;
break;
"DFKaiSho-SB", /* dfkaisb.ttf */
"DFKai-SB", /* kaiu.ttf */
"HuaTianSongTi?", /* htst3.ttf */
"MingLiU", /* mingliu.ttf & mingliu.ttc */
"PMingLiU", /* mingliu.ttc */
"MingLi43", /* mingli.ttf */
NULL
};
int nn;
/* Note that we only check the face name at the moment; it might */
/* be worth to do more checks for a few special cases. */
for ( nn = 0; trick_names[nn] != NULL; nn++ )
{
if ( ft_strcmp( ttface->family_name, trick_names[nn] ) == 0 )
{
unpatented_hinting = 1;
break;
}
}
}
ttface->internal->ignore_unpatented_hinter = !unpatented_hinting;
}
ttface->internal->unpatented_hinting = face->unpatented_hinting;
#endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING */
/* initialize standard glyph loading routines */