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[base, truetype] New function `FT_Get_Var_Axis_Flags'.

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The reserved `flags' field got a value in OpenType version 1.8.2;
unfortunately, the public `FT_Var_Axis' structure misses the
corresponding element.  Since we can't add a new field, we add an
access function.

* src/base/ftmm.c (FT_Get_Var_Axis_Flags): New function.

* include/freetype/ftmm.h (FT_VAR_AXIS_FLAG_HIDDEN): New macro.
Updated.

* src/truetype/ttgxvar.c (TT_Get_MM_Var): Increase allocated memory
of `mmvar' to hold axis flags.
Fill the axis flags array.

* docs/CHANGES: Updated.
This commit is contained in:
Werner Lemberg 2017-08-05 18:22:17 +02:00
parent 24e256ab00
commit f43b3094ef
5 changed files with 123 additions and 16 deletions
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20
ChangeLog
View File

@ -1,3 +1,23 @@
2017-08-05 Werner Lemberg <wl@gnu.org>
[base, truetype] New function `FT_Get_Var_Axis_Flags'.
The reserved `flags' field got a value in OpenType version 1.8.2;
unfortunately, the public `FT_Var_Axis' structure misses the
corresponding element. Since we can't add a new field, we add an
access function.
* src/base/ftmm.c (FT_Get_Var_Axis_Flags): New function.
* include/freetype/ftmm.h (FT_VAR_AXIS_FLAG_HIDDEN): New macro.
Updated.
* src/truetype/ttgxvar.c (TT_Get_MM_Var): Increase allocated memory
of `mmvar' to hold axis flags.
Fill the axis flags array.
* docs/CHANGES: Updated.
2017-08-03 Nikolaus Waxweiler <madigens@gmail.com>
[truetype] Fix metrics of B/W hinting in v40 mode.

4
docs/CHANGES
View File

@ -12,6 +12,10 @@ CHANGES BETWEEN 2.8 and 2.8.1
II. MISCELLANEOUS
- Using the new function `FT_Get_Var_Axis_Flags', an application
can access the `flags' field of a variation axis (introduced in
OpenType version 1.8.2)
- More sanity checks.

46
include/freetype/ftmm.h
View File

@ -196,7 +196,7 @@ FT_BEGIN_HEADER
/* FT_MM_Var */
/* */
/* <Description> */
/* A structure to model the axes and space of a Adobe MM, TrueType */
/* A structure to model the axes and space of an Adobe MM, TrueType */
/* GX, or OpenType variation font. */
/* */
/* Some fields are specific to one format and not to the others. */
@ -480,6 +480,50 @@ FT_BEGIN_HEADER
FT_UInt num_coords,
FT_Fixed* coords );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_VAR_AXIS_FLAG_XXX */
/* */
/* <Description> */
/* A list of bit flags used in the return value of */
/* @FT_Get_Var_Axis_Flags. */
/* */
/* <Values> */
/* FT_VAR_AXIS_FLAG_HIDDEN :: */
/* The variation axis should not be exposed to user interfaces. */
/* */
#define FT_VAR_AXIS_FLAG_HIDDEN 1
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Var_Axis_Flags */
/* */
/* <Description> */
/* Get the `flags' field of an OpenType Variation Axis Record. */
/* */
/* Not meaningful for Adobe MM fonts (`*flags' is always zero). */
/* */
/* <Input> */
/* master :: The variation descriptor. */
/* */
/* axis_index :: The index of the requested variation axis. */
/* */
/* <Output> */
/* flags :: The `flags' field. See @FT_VAR_AXIS_FLAG_XXX for */
/* possible values. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
FT_EXPORT( FT_Error )
FT_Get_Var_Axis_Flags( FT_MM_Var* master,
FT_UInt axis_index,
FT_UInt* flags );
/* */

24
src/base/ftmm.c
View File

@ -402,4 +402,28 @@
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_Var_Axis_Flags( FT_MM_Var* master,
FT_UInt axis_index,
FT_UInt* flags )
{
FT_UShort* axis_flags;
if ( !master || !flags )
return FT_THROW( Invalid_Argument );
if ( axis_index >= master->num_axis )
return FT_THROW( Invalid_Argument );
/* the axis flags array immediately follows the data of `master' */
axis_flags = (FT_UShort*)&( master[1] );
*flags = axis_flags[axis_index];
return FT_Err_Ok;
}
/* END */

45
src/truetype/ttgxvar.c
View File

@ -395,14 +395,14 @@
/* some macros we need */
#define FT_FIXED_ONE ( (FT_Fixed)0x10000 )
#define FT_FIXED_ONE ( (FT_Fixed)0x10000 )
#define FT_fdot14ToFixed( x ) \
( (FT_Fixed)( (FT_ULong)(x) << 2 ) )
#define FT_intToFixed( i ) \
( (FT_Fixed)( (FT_ULong)(i) << 16 ) )
#define FT_fixedToInt( x ) \
( (FT_Short)( ( (FT_UInt32)(x) + 0x8000U ) >> 16 ) )
#define FT_fdot14ToFixed( x ) \
( (FT_Fixed)( (FT_ULong)(x) << 2 ) )
#define FT_intToFixed( i ) \
( (FT_Fixed)( (FT_ULong)(i) << 16 ) )
#define FT_fixedToInt( x ) \
( (FT_Short)( ( (FT_UInt32)(x) + 0x8000U ) >> 16 ) )
static FT_Error
@ -1956,6 +1956,7 @@
GX_FVar_Head fvar_head;
FT_Bool usePsName;
FT_UInt num_instances;
FT_UShort* axis_flags;
static const FT_Frame_Field fvar_fields[] =
{
@ -2041,14 +2042,16 @@
/* in fvar's table of named instances */
num_instances = face->root.style_flags >> 16;
/* cannot overflow 32-bit arithmetic because of the size limits */
/* used in the `fvar' table validity check in `sfnt_init_face' */
/* prepare storage area for MM data; this cannot overflow */
/* 32-bit arithmetic because of the size limits used in the */
/* `fvar' table validity check in `sfnt_init_face' */
face->blend->mmvar_len =
sizeof ( FT_MM_Var ) +
fvar_head.axisCount * sizeof ( FT_UShort ) +
fvar_head.axisCount * sizeof ( FT_Var_Axis ) +
num_instances * sizeof ( FT_Var_Named_Style ) +
num_instances * fvar_head.axisCount * sizeof ( FT_Fixed ) +
5 * fvar_head.axisCount;
fvar_head.axisCount * 5;
if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
goto Exit;
@ -2065,8 +2068,12 @@
/* (or tuples, as called by Apple) */
mmvar->num_namedstyles =
num_instances;
/* alas, no public field in `FT_Var_Axis' for axis flags */
axis_flags =
(FT_UShort*)&( mmvar[1] );
mmvar->axis =
(FT_Var_Axis*)&( mmvar[1] );
(FT_Var_Axis*)&( axis_flags[fvar_head.axisCount] );
mmvar->namedstyle =
(FT_Var_Named_Style*)&( mmvar->axis[fvar_head.axisCount] );
@ -2110,6 +2117,8 @@
a->name[3] = (FT_String)( ( a->tag ) & 0xFF );
a->name[4] = '\0';
*axis_flags = axis_rec.flags;
if ( a->minimum > a->def ||
a->def > a->maximum )
{
@ -2121,13 +2130,17 @@
a->maximum = a->def;
}
FT_TRACE5(( " \"%s\": minimum=%.5f, default=%.5f, maximum=%.5f\n",
FT_TRACE5(( " \"%s\":"
" minimum=%.5f, default=%.5f, maximum=%.5f,"
" flags=0x%04X\n",
a->name,
a->minimum / 65536.0,
a->def / 65536.0,
a->maximum / 65536.0 ));
a->maximum / 65536.0,
*axis_flags ));
a++;
axis_flags++;
}
FT_TRACE5(( "\n" ));
@ -2244,13 +2257,15 @@
goto Exit;
FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len );
axis_flags =
(FT_UShort*)&( mmvar[1] );
mmvar->axis =
(FT_Var_Axis*)&( mmvar[1] );
(FT_Var_Axis*)&( axis_flags[mmvar->num_axis] );
mmvar->namedstyle =
(FT_Var_Named_Style*)&( mmvar->axis[mmvar->num_axis] );
next_coords =
(FT_Fixed*)&( mmvar->namedstyle[mmvar->num_namedstyles] );
for ( n = 0; n < mmvar->num_namedstyles; n++ )
{
mmvar->namedstyle[n].coords = next_coords;