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[truetype] Provide HVAR advance width variation as a service. 

Everything is guarded with TT_CONFIG_OPTION_GX_VAR_SUPPORT.

* src/truetype/ttdriver.c (tt_service_metrics_variations): Updated.

* src/truetype/ttgxvar.c (TT_Vary_Apply_Glyph_Deltas): Prevent
double adjustment of advance width.

* src/sfnt/ttmtx.c: Include FT_SERVICE_METRICS_VARIATIONS_H.
(tt_face_get_metrics): Apply metrics variations.
This commit is contained in:
Werner Lemberg 2016-12-15 14:34:57 +01:00
parent aa0c4b4f55
commit 3bd79cc257
4 changed files with 65 additions and 2 deletions
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19
ChangeLog
View File

@ -1,8 +1,25 @@
2016-12-15 Werner Lemberg <wl@gnu.org>
Dave Arnold <darnold@adobe.com>
[truetype] Provide HVAR advance width variation as a service.
Everything is guarded with TT_CONFIG_OPTION_GX_VAR_SUPPORT.
* src/truetype/ttdriver.c (tt_service_metrics_variations): Updated.
* src/truetype/ttgxvar.c (TT_Vary_Apply_Glyph_Deltas): Prevent
double adjustment of advance width.
* src/sfnt/ttmtx.c: Include FT_SERVICE_METRICS_VARIATIONS_H.
(tt_face_get_metrics): Apply metrics variations.
2016-12-15 Dave Arnold <darnold@adobe.com>
Werner Lemberg <wl@gnu.org>
[truetype] Provide function to apply `HVAR' advance width variation.
Everything is guarded with TT_CONFIG_OPTION_GX_VAR_SUPPORT.
* src/truetype/ttgxvar.c (tt_hadvance_adjust): New function.
* src/truetype/ttgxvar.h: Updated.
@ -16,6 +33,8 @@
Activation of the code follows in another commit.
Everything is guarded with TT_CONFIG_OPTION_GX_VAR_SUPPORT.
* include/freetype/ftmm.h (FT_Var_Named_Style): Add `psid' member.
* src/truetype/ttgxvar.h (GX_HVarData, GX_AxisCoords, GX_HVarRegion,

38
src/sfnt/ttmtx.c
View File

@ -20,6 +20,11 @@
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_TRUETYPE_TAGS_H
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include FT_SERVICE_METRICS_VARIATIONS_H
#endif
#include "ttmtx.h"
#include "sferrors.h"
@ -214,6 +219,11 @@
FT_ULong table_pos, table_size, table_end;
FT_UShort k;
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
FT_Service_MetricsVariations var =
(FT_Service_MetricsVariations)face->var;
#endif
if ( vertical )
{
@ -274,6 +284,34 @@
*abearing = 0;
*aadvance = 0;
}
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
if ( var )
{
FT_Face f = FT_FACE( face );
FT_Int a = (FT_Int)*aadvance;
FT_Int b = (FT_Int)*abearing;
if ( vertical )
{
if ( var->vadvance_adjust )
var->vadvance_adjust( f, gindex, &a );
if ( var->tsb_adjust )
var->tsb_adjust( f, gindex, &b );
}
else
{
if ( var->hadvance_adjust )
var->hadvance_adjust( f, gindex, &a );
if ( var->lsb_adjust )
var->lsb_adjust( f, gindex, &b );
}
*aadvance = (FT_Short)a;
*abearing = (FT_UShort)b;
}
#endif
}

2
src/truetype/ttdriver.c
View File

@ -484,7 +484,7 @@
FT_DEFINE_SERVICE_METRICSVARIATIONSREC(
tt_service_metrics_variations,
(FT_HAdvance_Adjust_Func)NULL, /* hadvance_adjust */
(FT_HAdvance_Adjust_Func)tt_hadvance_adjust, /* hadvance_adjust */
(FT_LSB_Adjust_Func) NULL, /* lsb_adjust */
(FT_RSB_Adjust_Func) NULL, /* rsb_adjust */

8
src/truetype/ttgxvar.c
View File

@ -2629,7 +2629,13 @@
FT_Pos delta_y = FT_MulFix( deltas_y[j], apply );
outline->points[j].x += delta_x;
/* Experimental fix for double adjustment of advance width: */
/* adjust phantom point 2 only if there's no HVAR. */
/* */
/* TODO: handle LSB (pp1) and VVAR (pp3, pp4) too */
if ( j != ( n_points - 3 ) || blend->hvar_checked == FALSE )
outline->points[j].x += delta_x;
outline->points[j].y += delta_y;
#ifdef FT_DEBUG_LEVEL_TRACE