ref: 576403f22be42343da8e7f2c1cbc7b4aef4fc8ad
dir: /src/base/ftmm.c/
/****************************************************************************
*
* ftmm.c
*
* Multiple Master font support (body).
*
* Copyright (C) 1996-2020 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#include <freetype/internal/ftdebug.h>
#include <freetype/ftmm.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/services/svmm.h>
#include <freetype/internal/services/svmetric.h>
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT mm
static FT_Error
ft_face_get_mm_service( FT_Face face,
FT_Service_MultiMasters *aservice )
{
FT_Error error;
*aservice = NULL;
if ( !face )
return FT_THROW( Invalid_Face_Handle );
error = FT_ERR( Invalid_Argument );
if ( FT_HAS_MULTIPLE_MASTERS( face ) )
{
FT_FACE_LOOKUP_SERVICE( face,
*aservice,
MULTI_MASTERS );
if ( *aservice )
error = FT_Err_Ok;
}
return error;
}
static FT_Error
ft_face_get_mvar_service( FT_Face face,
FT_Service_MetricsVariations *aservice )
{
FT_Error error;
*aservice = NULL;
if ( !face )
return FT_THROW( Invalid_Face_Handle );
error = FT_ERR( Invalid_Argument );
if ( FT_HAS_MULTIPLE_MASTERS( face ) )
{
FT_FACE_LOOKUP_SERVICE( face,
*aservice,
METRICS_VARIATIONS );
if ( *aservice )
error = FT_Err_Ok;
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_Multi_Master( FT_Face face,
FT_Multi_Master *amaster )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( !amaster )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->get_mm )
error = service->get_mm( face, amaster );
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_MM_Var( FT_Face face,
FT_MM_Var* *amaster )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( !amaster )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->get_mm_var )
error = service->get_mm_var( face, amaster );
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Done_MM_Var( FT_Library library,
FT_MM_Var* amaster )
{
FT_Memory memory;
if ( !library )
return FT_THROW( Invalid_Library_Handle );
memory = library->memory;
FT_FREE( amaster );
return FT_Err_Ok;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Set_MM_Design_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Long* coords )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( num_coords && !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->set_mm_design )
error = service->set_mm_design( face, num_coords, coords );
}
/* enforce recomputation of auto-hinting data */
if ( !error && face->autohint.finalizer )
{
face->autohint.finalizer( face->autohint.data );
face->autohint.data = NULL;
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Set_MM_WeightVector( FT_Face face,
FT_UInt len,
FT_Fixed* weightvector )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( len && !weightvector )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->set_mm_weightvector )
error = service->set_mm_weightvector( face, len, weightvector );
}
/* enforce recomputation of auto-hinting data */
if ( !error && face->autohint.finalizer )
{
face->autohint.finalizer( face->autohint.data );
face->autohint.data = NULL;
}
return error;
}
FT_EXPORT_DEF( FT_Error )
FT_Get_MM_WeightVector( FT_Face face,
FT_UInt* len,
FT_Fixed* weightvector )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( len && !weightvector )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->get_mm_weightvector )
error = service->get_mm_weightvector( face, len, weightvector );
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Set_Var_Design_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
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' */
if ( num_coords && !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service_mm );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service_mm->set_var_design )
error = service_mm->set_var_design( face, num_coords, coords );
/* internal error code -1 means `no change'; we can exit immediately */
if ( error == -1 )
return FT_Err_Ok;
}
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;
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_Var_Design_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->get_var_design )
error = service->get_var_design( face, num_coords, coords );
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Set_MM_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
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' */
if ( num_coords && !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service_mm );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service_mm->set_mm_blend )
error = service_mm->set_mm_blend( face, num_coords, coords );
/* internal error code -1 means `no change'; we can exit immediately */
if ( error == -1 )
return FT_Err_Ok;
}
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;
}
return error;
}
/* documentation is in ftmm.h */
/* This is exactly the same as the previous function. It exists for */
/* orthogonality. */
FT_EXPORT_DEF( FT_Error )
FT_Set_Var_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
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' */
if ( num_coords && !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service_mm );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service_mm->set_mm_blend )
error = service_mm->set_mm_blend( face, num_coords, coords );
/* internal error code -1 means `no change'; we can exit immediately */
if ( error == -1 )
return FT_Err_Ok;
}
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;
}
return error;
}
/* documentation is in ftmm.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_MM_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->get_mm_blend )
error = service->get_mm_blend( face, num_coords, coords );
}
return error;
}
/* documentation is in ftmm.h */
/* This is exactly the same as the previous function. It exists for */
/* orthogonality. */
FT_EXPORT_DEF( FT_Error )
FT_Get_Var_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
FT_Error error;
FT_Service_MultiMasters service;
/* check of `face' delayed to `ft_face_get_mm_service' */
if ( !coords )
return FT_THROW( Invalid_Argument );
error = ft_face_get_mm_service( face, &service );
if ( !error )
{
error = FT_ERR( Invalid_Argument );
if ( service->get_mm_blend )
error = service->get_mm_blend( face, num_coords, coords );
}
return error;
}
/* 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;
}
/* 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 */