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[cff, truetype] Adjust behaviour of named instances. 

This commit completely separates the interaction between named
instances and variation functions.  In particular, resetting the
variation returns to the current named instance (if set) and not to
the base font.

As a side effect, variation functions no longer change the named
instance index.

* src/cff/cffobjs.c (cff_face_init): Use MM service's `set_instance'
function.
Also apply `MVAR' table to named instances.

* src/truetype/ttgxvar.c (TT_Get_MM_Var): Add cast.
(tt_set_mm_blend): No longer check whether requested variation
coincides with a named instance.
(TT_Set_Var_Design): Use current named instance for default
coordinates.
* src/truetype/ttobjs.c (tt_face_init): Use `TT_Set_Named_Instance'.
This commit is contained in:
Werner Lemberg 2017-10-07 13:10:53 +02:00
parent e9ef538a4f
commit f89c67f043
6 changed files with 99 additions and 107 deletions
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23
ChangeLog
View File

@ -1,3 +1,26 @@
2017-10-07 Werner Lemberg <wl@gnu.org>
[cff, truetype] Adjust behaviour of named instances.
This commit completely separates the interaction between named
instances and variation functions. In particular, resetting the
variation returns to the current named instance (if set) and not to
the base font.
As a side effect, variation functions no longer change the named
instance index.
* src/cff/cffobjs.c (cff_face_init): Use MM service's `set_instance'
function.
Also apply `MVAR' table to named instances.
* src/truetype/ttgxvar.c (TT_Get_MM_Var): Add cast.
(tt_set_mm_blend): No longer check whether requested variation
coincides with a named instance.
(TT_Set_Var_Design): Use current named instance for default
coordinates.
* src/truetype/ttobjs.c (tt_face_init): Use `TT_Set_Named_Instance'.
2017-10-07 Werner Lemberg <wl@gnu.org>
Make `FT_Set_Named_Instance' work.

12
include/freetype/freetype.h
View File

@ -904,6 +904,13 @@ FT_BEGIN_HEADER
/* Bit 31 is always zero (this is, */
/* `face_index' is always a positive value). */
/* */
/* [Since 2.8.2] Changing the design */
/* coordinates with */
/* @FT_Set_Var_Design_Coordinates or */
/* @FT_Set_Var_Blend_Coordinates does not */
/* influence the named instance index value */
/* (only @FT_Set_Named_Instance does that). */
/* */
/* face_flags :: A set of bit flags that give important */
/* information about the face; see */
/* @FT_FACE_FLAG_XXX for the details. */
@ -1403,6 +1410,11 @@ FT_BEGIN_HEADER
* A macro that returns true whenever a face object is a named instance
* of a GX or OpenType variation font.
*
* [Since 2.8.2] Changing the design coordinates with
* @FT_Set_Var_Design_Coordinates or @FT_Set_Var_Blend_Coordinates does
* not influence the return value of this macro (only
* @FT_Set_Named_Instance does that).
*
* @since:
* 2.7
*

37
include/freetype/ftmm.h
View File

@ -323,9 +323,13 @@ FT_BEGIN_HEADER
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* To reset all axes to the default values, call the function with */
/* `num_coords' set to zero and `coords' set to NULL (new feature in */
/* FreeType version 2.8.1). */
/* [Since 2.8.1] To reset all axes to the default values, call the */
/* function with `num_coords' set to zero and `coords' set to NULL. */
/* */
/* [Since 2.8.2] If `num_coords' is larger than zero, this function */
/* sets the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags' */
/* field (i.e., @FT_IS_VARIATION will return true). If `num_coords' */
/* is zero, this bit flag gets unset. */
/* */
FT_EXPORT( FT_Error )
FT_Set_MM_Design_Coordinates( FT_Face face,
@ -358,9 +362,15 @@ FT_BEGIN_HEADER
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* To reset all axes to the default values, call the function with */
/* `num_coords' set to zero and `coords' set to NULL (new feature in */
/* FreeType version 2.8.1). */
/* [Since 2.8.1] To reset all axes to the default values, call the */
/* function with `num_coords' set to zero and `coords' set to NULL. */
/* [Since 2.8.2] `Default values' means the currently selected named */
/* instance (or the base font if no named instance is selected). */
/* */
/* [Since 2.8.2] If `num_coords' is larger than zero, this function */
/* sets the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags' */
/* field (i.e., @FT_IS_VARIATION will return true). If `num_coords' */
/* is zero, this bit flag gets unset. */
/* */
FT_EXPORT( FT_Error )
FT_Set_Var_Design_Coordinates( FT_Face face,
@ -430,9 +440,15 @@ FT_BEGIN_HEADER
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* To reset all axes to the default values, call the function with */
/* `num_coords' set to zero and `coords' set to NULL (new feature in */
/* FreeType version 2.8.1). */
/* [Since 2.8.1] To reset all axes to the default values, call the */
/* function with `num_coords' set to zero and `coords' set to NULL. */
/* [Since 2.8.2] `Default values' means the currently selected named */
/* instance (or the base font if no named instance is selected). */
/* */
/* [Since 2.8.2] If `num_coords' is larger than zero, this function */
/* sets the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags' */
/* field (i.e., @FT_IS_VARIATION will return true). If `num_coords' */
/* is zero, this bit flag gets unset. */
/* */
FT_EXPORT( FT_Error )
FT_Set_MM_Blend_Coordinates( FT_Face face,
@ -518,6 +534,9 @@ FT_BEGIN_HEADER
/* FT_VAR_AXIS_FLAG_HIDDEN :: */
/* The variation axis should not be exposed to user interfaces. */
/* */
/* <Since> */
/* 2.8.1 */
/* */
#define FT_VAR_AXIS_FLAG_HIDDEN 1

40
src/cff/cffobjs.c
View File

@ -708,50 +708,22 @@
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
{
FT_Service_MultiMasters mm = (FT_Service_MultiMasters)face->mm;
FT_Service_MultiMasters mm = (FT_Service_MultiMasters)face->mm;
FT_Service_MetricsVariations var = (FT_Service_MetricsVariations)face->var;
FT_Int instance_index = face_index >> 16;
FT_UInt instance_index = (FT_UInt)face_index >> 16;
if ( FT_HAS_MULTIPLE_MASTERS( cffface ) &&
mm &&
instance_index > 0 )
{
FT_MM_Var* mm_var;
error = mm->get_mm_var( cffface, NULL );
error = mm->set_instance( cffface, instance_index );
if ( error )
goto Exit;
mm->get_var_blend( cffface, NULL, NULL, NULL, &mm_var );
if ( mm_var->namedstyle )
{
FT_Var_Named_Style* named_style;
FT_String* style_name;
/* in `face_index', the instance index starts with value 1 */
named_style = mm_var->namedstyle + instance_index - 1;
error = sfnt->get_name( face,
(FT_UShort)named_style->strid,
&style_name );
if ( error )
goto Exit;
/* set style name; if already set, replace it */
if ( face->root.style_name )
FT_FREE( face->root.style_name );
face->root.style_name = style_name;
/* finally, select the named instance */
error = mm->set_var_design( cffface,
mm_var->num_axis,
named_style->coords );
if ( error )
goto Exit;
}
if ( var )
var->metrics_adjust( cffface );
}
}
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */

59
src/truetype/ttgxvar.c
View File

@ -2057,7 +2057,7 @@
/* `num_instances' holds the number of all named instances, */
/* including the default instance which might be missing */
/* in fvar's table of named instances */
num_instances = face->root.style_flags >> 16;
num_instances = (FT_UInt)face->root.style_flags >> 16;
/* prepare storage area for MM data; this cannot overflow */
/* 32-bit arithmetic because of the size limits used in the */
@ -2348,7 +2348,7 @@
FT_Error error = FT_Err_Ok;
GX_Blend blend;
FT_MM_Var* mmvar;
FT_UInt i, j;
FT_UInt i;
FT_Bool all_design_coords = FALSE;
@ -2489,30 +2489,6 @@
}
}
/* check whether the current variation tuple coincides */
/* with a named instance */
for ( i = 0; i < blend->mmvar->num_namedstyles; i++ )
{
FT_Fixed* nsc = blend->normalized_stylecoords + i * blend->num_axis;
FT_Fixed* ns = blend->normalizedcoords;
for ( j = 0; j < blend->num_axis; j++, nsc++, ns++ )
{
if ( *nsc != *ns )
break;
}
if ( j == blend->num_axis )
break;
}
/* adjust named instance index */
face->root.face_index &= 0xFFFF;
if ( i < blend->mmvar->num_namedstyles )
face->root.face_index |= ( i + 1 ) << 16;
/* enforce recomputation of the PostScript name; */
FT_FREE( face->postscript_name );
face->postscript_name = NULL;
@ -2680,9 +2656,7 @@
FT_UInt i;
FT_Memory memory = face->root.memory;
FT_Var_Axis* a;
FT_Fixed* c;
FT_Fixed* c;
FT_Fixed* normalized = NULL;
@ -2713,10 +2687,31 @@
coords,
num_coords * sizeof ( FT_Fixed ) );
a = mmvar->axis + num_coords;
c = blend->coords + num_coords;
for ( i = num_coords; i < mmvar->num_axis; i++, a++, c++ )
*c = a->def;
if ( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) )
{
FT_UInt instance_index;
FT_Var_Named_Style* named_style;
FT_Fixed* n;
instance_index = (FT_UInt)face->root.face_index >> 16;
named_style = mmvar->namedstyle + instance_index - 1;
n = named_style->coords + num_coords;
for ( i = num_coords; i < mmvar->num_axis; i++, n++, c++ )
*c = *n;
}
else
{
FT_Var_Axis* a;
a = mmvar->axis + num_coords;
for ( i = num_coords; i < mmvar->num_axis; i++, a++, c++ )
*c = a->def;
}
if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) )
goto Exit;

35
src/truetype/ttobjs.c
View File

@ -657,46 +657,17 @@
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
{
FT_Int instance_index = face_index >> 16;
FT_UInt instance_index = (FT_UInt)face_index >> 16;
if ( FT_HAS_MULTIPLE_MASTERS( ttface ) &&
instance_index > 0 )
{
error = TT_Get_MM_Var( face, NULL );
error = TT_Set_Named_Instance( face, instance_index );
if ( error )
goto Exit;
if ( face->blend->mmvar->namedstyle )
{
FT_Memory memory = ttface->memory;
FT_Var_Named_Style* named_style;
FT_String* style_name;
/* in `face_index', the instance index starts with value 1 */
named_style = face->blend->mmvar->namedstyle + instance_index - 1;
error = sfnt->get_name( face,
(FT_UShort)named_style->strid,
&style_name );
if ( error )
goto Exit;
/* set style name; if already set, replace it */
if ( face->root.style_name )
FT_FREE( face->root.style_name );
face->root.style_name = style_name;
/* finally, select the named instance */
error = TT_Set_Var_Design( face,
face->blend->mmvar->num_axis,
named_style->coords );
if ( error )
goto Exit;
tt_apply_mvar( face );
}
tt_apply_mvar( face );
}
}