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Code Issues 4 Releases Wiki Activity

[sfnt, truetype] Add `size_reset` to `MetricsVariations`. 

This is a generalization of commit

```
commit e6699596af
Author: Werner Lemberg <wl@gnu.org>
Date:   Thu Feb 2 11:38:04 2017 +0100

    [truetype] Fix MVAR post-action handling.
```

It is also possible for plain `CFF ` style fonts to contain an `fvar` and
`MVAR` table and use `cff_metrics_adjust`.  `tt_size_reset` should only be
called with `TT_Size` and never with `CFF_Size`.

Allow the "metrics-variations" service to specify the correct function (if
any) to reset `FT_Size`s after adjusting metrics.

* src/truetype/ttobjs.c (tt_size_reset): Split off some functionality
into...
(tt_size_reset_height): ... this new function.

* src/truetype/ttdriver.c (tt_service_metrics_variations): Add
`size_reset`.
(tt_size_select, tt_size_request): Updated.

* src/truetype/ttobjs.h: Updated.

* include/freetype/internal/services/svmetric.h (MetricsVariations): Add
`size_reset`.
(FT_DEFINE_SERVICE_METRICSVARIATIONSREC): Updated.

* include/freetype/internal/tttypes.h (TT_FaceRec_): Rename `var` to
`tt_var` and add `face_var`.

* src/cff/cffdrivr.c (cff_service_metrics_variations): Add `size_reset`.
(cff_hadvance_adjust, cff_metrics_adjust): Updated.

* src/cff/cffobjs.c (cff_face_init): Use `face_var`.

* src/sfnt/sfobjs.c (sfnt_init_face): Initialize `face_var`.

* src/sfnt/ttmtx.c (tt_face_get_metrics): Use `tt_var`.

* src/truetype/ttgxvar.c (tt_size_reset_iterator): Renamed to...
(ft_size_reset_iterator): ... this new function.
Call `size_reset`.
(tt_apply_mvar): Pass `size_reset` to `ft_size_reset_iterator`.

Fixes #1211
This commit is contained in:
Ben Wagner 2023-04-06 11:16:29 -04:00 committed by Werner Lemberg
parent e77d8ba87c
commit e78e2d29a9
10 changed files with 93 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/freetype/internal/services/svmetric.h
View File

@ -77,6 +77,9 @@ FT_BEGIN_HEADER
typedef void
(*FT_Metrics_Adjust_Func)( FT_Face face );
typedef void
(*FT_Size_Reset_Func)( FT_Size size );
FT_DEFINE_SERVICE( MetricsVariations )
{
@ -90,6 +93,7 @@ FT_BEGIN_HEADER
FT_VOrg_Adjust_Func vorg_adjust;
FT_Metrics_Adjust_Func metrics_adjust;
FT_Size_Reset_Func size_reset;
};
@ -101,7 +105,8 @@ FT_BEGIN_HEADER
tsb_adjust_, \
bsb_adjust_, \
vorg_adjust_, \
metrics_adjust_ ) \
metrics_adjust_, \
size_reset_ ) \
static const FT_Service_MetricsVariationsRec class_ = \
{ \
hadvance_adjust_, \
@ -111,7 +116,8 @@ FT_BEGIN_HEADER
tsb_adjust_, \
bsb_adjust_, \
vorg_adjust_, \
metrics_adjust_ \
metrics_adjust_, \
size_reset_ \
};
/* */

10
include/freetype/internal/tttypes.h
View File

@ -1455,8 +1455,14 @@ FT_BEGIN_HEADER
void* mm;
/* a typeless pointer to the FT_Service_MetricsVariationsRec table */
/* used to handle the HVAR, VVAR, and MVAR OpenType tables */
void* var;
/* used to handle the HVAR, VVAR, and MVAR OpenType tables by the */
/* "truetype" driver */
void* tt_var;
/* a typeless pointer to the FT_Service_MetricsVariationsRec table */
/* used to handle the HVAR, VVAR, and MVAR OpenType tables by this */
/* TT_Face's driver */
void* face_var;
#endif
/* a typeless pointer to the PostScript Aux service */

9
src/cff/cffdrivr.c
View File

@ -1046,7 +1046,8 @@
FT_UInt gindex,
FT_Int *avalue )
{
FT_Service_MetricsVariations var = (FT_Service_MetricsVariations)face->var;
FT_Service_MetricsVariations
var = (FT_Service_MetricsVariations)face->tt_var;
return var->hadvance_adjust( FT_FACE( face ), gindex, avalue );
@ -1056,7 +1057,8 @@
static void
cff_metrics_adjust( CFF_Face face )
{
FT_Service_MetricsVariations var = (FT_Service_MetricsVariations)face->var;
FT_Service_MetricsVariations
var = (FT_Service_MetricsVariations)face->tt_var;
var->metrics_adjust( FT_FACE( face ) );
@ -1075,7 +1077,8 @@
(FT_BSB_Adjust_Func) NULL, /* bsb_adjust */
(FT_VOrg_Adjust_Func) NULL, /* vorg_adjust */
(FT_Metrics_Adjust_Func) cff_metrics_adjust /* metrics_adjust */
(FT_Metrics_Adjust_Func) cff_metrics_adjust, /* metrics_adjust */
(FT_Size_Reset_Func) NULL /* size_reset */
)
#endif

6
src/cff/cffobjs.c
View File

@ -719,8 +719,10 @@
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
{
FT_Service_MultiMasters mm = (FT_Service_MultiMasters)face->mm;
FT_Service_MetricsVariations var = (FT_Service_MetricsVariations)face->var;
FT_Service_MultiMasters
mm = (FT_Service_MultiMasters)face->mm;
FT_Service_MetricsVariations
var = (FT_Service_MetricsVariations)face->face_var;
FT_UInt instance_index = (FT_UInt)face_index >> 16;

14
src/sfnt/sfobjs.c
View File

@ -534,17 +534,23 @@
0 );
}
if ( !face->var )
if ( !face->tt_var )
{
/* we want the metrics variations interface */
/* from the `truetype' module only */
FT_Module tt_module = FT_Get_Module( library, "truetype" );
face->var = ft_module_get_service( tt_module,
FT_SERVICE_ID_METRICS_VARIATIONS,
0 );
face->tt_var = ft_module_get_service( tt_module,
FT_SERVICE_ID_METRICS_VARIATIONS,
0 );
}
if ( !face->face_var )
face->face_var = ft_module_get_service(
&face->root.driver->root,
FT_SERVICE_ID_METRICS_VARIATIONS,
0 );
#endif
FT_TRACE2(( "SFNT driver\n" ));

2
src/sfnt/ttmtx.c
View File

@ -239,7 +239,7 @@
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
FT_Service_MetricsVariations var =
(FT_Service_MetricsVariations)face->var;
(FT_Service_MetricsVariations)face->tt_var;
#endif

7
src/truetype/ttdriver.c
View File

@ -316,7 +316,7 @@
/* use the scaled metrics, even when tt_size_reset fails */
FT_Select_Metrics( size->face, strike_index );
tt_size_reset( ttsize, 0 ); /* ignore return value */
tt_size_reset( ttsize ); /* ignore return value */
}
else
{
@ -377,7 +377,7 @@
if ( FT_IS_SCALABLE( size->face ) )
{
error = tt_size_reset( ttsize, 0 );
error = tt_size_reset( ttsize );
#ifdef TT_USE_BYTECODE_INTERPRETER
/* for the `MPS' bytecode instruction we need the point size */
@ -559,7 +559,8 @@
(FT_BSB_Adjust_Func) NULL, /* bsb_adjust */
(FT_VOrg_Adjust_Func) NULL, /* vorg_adjust */
(FT_Metrics_Adjust_Func) tt_apply_mvar /* metrics_adjust */
(FT_Metrics_Adjust_Func) tt_apply_mvar, /* metrics_adjust */
(FT_Size_Reset_Func) tt_size_reset_height /* size_reset */
)
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */

23
src/truetype/ttgxvar.c
View File

@ -1462,15 +1462,14 @@
static FT_Error
tt_size_reset_iterator( FT_ListNode node,
ft_size_reset_iterator( FT_ListNode node,
void* user )
{
TT_Size size = (TT_Size)node->data;
FT_UNUSED( user );
FT_Size size = (FT_Size)node->data;
FT_Service_MetricsVariations var = (FT_Service_MetricsVariations)user;
tt_size_reset( size, 1 );
var->size_reset( size );
return FT_Err_Ok;
}
@ -1543,6 +1542,9 @@
/* adjust all derived values */
{
FT_Service_MetricsVariations var =
(FT_Service_MetricsVariations)face->face_var;
FT_Face root = &face->root;
/*
@ -1584,11 +1586,12 @@
face->postscript.underlineThickness / 2;
root->underline_thickness = face->postscript.underlineThickness;
/* iterate over all FT_Size objects and call `tt_size_reset' */
/* to propagate the metrics changes */
FT_List_Iterate( &root->sizes_list,
tt_size_reset_iterator,
NULL );
/* iterate over all FT_Size objects and call `var->size_reset' */
/* to propagate the metrics changes */
if ( var && var->size_reset )
FT_List_Iterate( &root->sizes_list,
ft_size_reset_iterator,
(void*)var );
}
}

62
src/truetype/ttobjs.c
View File

@ -1338,39 +1338,25 @@
/**************************************************************************
*
* @Function:
* tt_size_reset
* tt_size_reset_height
*
* @Description:
* Reset a TrueType size when resolutions and character dimensions
* have been changed.
* Recompute a TrueType size's ascender, descender, and height
* when resolutions and character dimensions have been changed.
* Used for variation fonts as an iterator function.
*
* @Input:
* size ::
* A handle to the target size object.
*
* only_height ::
* Only recompute ascender, descender, and height;
* this flag is used for variation fonts where
* `tt_size_reset' is used as an iterator function.
*/
FT_LOCAL_DEF( FT_Error )
tt_size_reset( TT_Size size,
FT_Bool only_height )
tt_size_reset_height( TT_Size size )
{
TT_Face face;
FT_Size_Metrics* size_metrics;
face = (TT_Face)size->root.face;
/* nothing to do for CFF2 */
if ( face->is_cff2 )
return FT_Err_Ok;
TT_Face face = (TT_Face)size->root.face;
FT_Size_Metrics* size_metrics = &size->hinted_metrics;
size->ttmetrics.valid = FALSE;
size_metrics = &size->hinted_metrics;
/* copy the result from base layer */
*size_metrics = size->root.metrics;
@ -1397,12 +1383,34 @@
size->ttmetrics.valid = TRUE;
if ( only_height )
{
/* we must not recompute the scaling values here since */
/* `tt_size_reset' was already called (with only_height = 0) */
return FT_Err_Ok;
}
return FT_Err_Ok;
}
/**************************************************************************
*
* @Function:
* tt_size_reset
*
* @Description:
* Reset a TrueType size when resolutions and character dimensions
* have been changed.
*
* @Input:
* size ::
* A handle to the target size object.
*/
FT_LOCAL_DEF( FT_Error )
tt_size_reset( TT_Size size )
{
FT_Error error;
TT_Face face = (TT_Face)size->root.face;
FT_Size_Metrics* size_metrics = &size->hinted_metrics;
error = tt_size_reset_height( size );
if ( error )
return error;
if ( face->header.Flags & 8 )
{

6
src/truetype/ttobjs.h
View File

@ -391,8 +391,10 @@ FT_BEGIN_HEADER
#endif /* TT_USE_BYTECODE_INTERPRETER */
FT_LOCAL( FT_Error )
tt_size_reset( TT_Size size,
FT_Bool only_height );
tt_size_reset_height( TT_Size size );
FT_LOCAL( FT_Error )
tt_size_reset( TT_Size size );
/**************************************************************************