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New function `FT_Set_Named_Instance'. 

No effect yet.

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

* include/freetype/ftmm.h: Updated.
This commit is contained in:
Werner Lemberg 2017-10-07 11:40:03 +02:00
parent b3f9c4f2f6
commit dd8539ef82
3 changed files with 95 additions and 0 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2017-10-07 Werner Lemberg <wl@gnu.org>
New function `FT_Set_Named_Instance'.
No effect yet.
* src/base/ftmm.c (FT_Set_Named_Instance): New function.
* include/freetype/ftmm.h: Updated.
2017-10-07 Werner Lemberg <wl@gnu.org>
Add macros for checking whether a font variation is active.

37
include/freetype/ftmm.h
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@ -551,6 +551,43 @@ FT_BEGIN_HEADER
FT_UInt axis_index,
FT_UInt* flags );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Named_Instance */
/* */
/* <Description> */
/* Set or change the current named instance. */
/* */
/* <Input> */
/* face :: A handle to the source face. */
/* */
/* instance_index :: The index of the requested instance, starting */
/* with value 1. If set to value 0, FreeType */
/* switches to font access without a named */
/* instance. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* The function uses the value of `instance_index' to set bits 16-30 */
/* of the face's `face_index' field. It also resets any variation */
/* applied to the font, and the @FT_FACE_FLAG_VARIATION bit of the */
/* face's `face_flags' field gets reset to zero (i.e., */
/* @FT_IS_VARIATION will return false). */
/* */
/* For Adobe MM fonts (which don't have named instances) this */
/* function simply resets the current face to the default instance. */
/* */
/* <Since> */
/* 2.8.2 */
/* */
FT_EXPORT( FT_Error )
FT_Set_Named_Instance( FT_Face face,
FT_UInt instance_index );
/* */

48
src/base/ftmm.c
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@ -426,4 +426,52 @@
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Set_Named_Instance( FT_Face face,
FT_UInt instance_index )
{
FT_Error error;
FT_Service_MultiMasters service_mm = NULL;
FT_Service_MetricsVariations service_mvar = NULL;
/* check of `face' delayed to `ft_face_get_mm_service' */
error = ft_face_get_mm_service( face, &service_mm );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service_mm->set_instance )
error = service_mm->set_instance( face, instance_index );
}
if ( !error )
{
(void)ft_face_get_mvar_service( face, &service_mvar );
if ( service_mvar && service_mvar->metrics_adjust )
service_mvar->metrics_adjust( face );
}
/* enforce recomputation of auto-hinting data */
if ( !error && face->autohint.finalizer )
{
face->autohint.finalizer( face->autohint.data );
face->autohint.data = NULL;
}
if ( !error )
{
face->face_index = ( instance_index << 16 ) |
( face->face_index & 0xFFFFL );
face->face_flags &= ~FT_FACE_FLAG_VARIATION;
}
return error;
}
/* END */