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Add vertical metrics support to OpenType CFF outlines. Based on a

Browse Source 
patch from Mike Moening <MikeM@RetekSolutions.com>

* src/cff/cffgload.c (cff_face_get_vertical_metrics): New function.
(cff_slot_load): Use cff_face_get_vertical_metrics.

* docs/CHANGES: Updated.
This commit is contained in:
Werner Lemberg 2005-11-17 08:12:00 +00:00
parent 35bfc0f1b9
commit cfc0cf2e78
3 changed files with 160 additions and 34 deletions
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28
ChangeLog
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@ -1,17 +1,29 @@
2005-11-17 Werner Lemberg <wl@gnu.org>
Add vertical metrics support to OpenType CFF outlines. Based on a
patch from Mike Moening <MikeM@RetekSolutions.com>
* src/cff/cffgload.c (cff_face_get_vertical_metrics): New function.
(cff_slot_load): Use cff_face_get_vertical_metrics.
* docs/CHANGES: Updated.
2005-11-17 Chia-I Wu <b90201047@ntu.edu.tw>
* src/base/ftcalc.c (FT_MulTo64): Commented out.
* include/freetype/internal/ftcalc.h (FT_SqrtFixed), src/base/ftcalc.c
(FT_SqrtFixed), include/freetype/internal/ftdebug.h
* include/freetype/internal/ftcalc.h (FT_SqrtFixed),
src/base/ftcalc.c (FT_SqrtFixed),
include/freetype/internal/ftdebug.h (FT_Trace_Get_Count,
FT_Trace_Get_Name, FT_Message, FT_Panic), src/base/ftdebug.c
(FT_Trace_Get_Count, FT_Trace_Get_Name, FT_Message, FT_Panic),
src/base/ftdebug.c (FT_Trace_Get_Count, FT_Trace_Get_Name, FT_Message,
FT_Panic), include/freetype/internal/ftobjs.h (FT_New_Memory,
FT_Done_Memory), include/freetype/internal/ftstream.h
(FT_Stream_Open), src/base/ftsystem.c (FT_New_Memory, FT_Done_Memory,
FT_Stream_Open): s/FT_EXPORT/FT_BASE/.
include/freetype/internal/ftobjs.h (FT_New_Memory, FT_Done_Memory),
include/freetype/internal/ftstream.h (FT_Stream_Open),
src/base/ftsystem.c (FT_New_Memory, FT_Done_Memory, FT_Stream_Open):
s/FT_EXPORT/FT_BASE/.
* builds/exports.mk: Manually add TT_New_Context to EXPORTS_LIST too.
* builds/exports.mk: Manually add TT_New_Context to EXPORTS_LIST
too.
2005-11-15 David Turner <david@freetype.org>

3
docs/CHANGES
View File

@ -6,6 +6,9 @@ LATEST CHANGES BETWEEN 2.2.0 and 2.1.10
- The FT_HAS_KERNING macro always returned 0.
- CFF OpenType fonts didn't return correct vertical metrics for
glyphs with outlines.
II. IMPORTANT CHANGES
- A new API `FT_TrueTypeGX_Validate' (in FT_GX_VALIDATE_H) has

163
src/cff/cffgload.c
View File

@ -569,6 +569,117 @@
}
/*************************************************************************/
/* */
/* <Function> */
/* cff_face_get_vertical_metrics */
/* */
/* <Description> */
/* Return the vertical metrics in font units for a given glyph. The */
/* metrics are the top side bearing and advance height. */
/* */
/* <Input> */
/* header :: A pointer to the vertical metrics structure. */
/* */
/* idx :: The glyph index. */
/* */
/* <Output> */
/* bearing :: The top side bearing. */
/* */
/* advance :: The advance height. */
/* */
/* <Note> */
/* Horizontal metric values are directly computed from the CFF data, */
/* bypassing the `hmtx' table completely. */
/* */
#ifdef FT_OPTIMIZE_MEMORY
static void
cff_face_get_vertical_metrics( TT_Face face,
FT_UInt idx,
FT_Short *abearing,
FT_UShort *aadvance )
{
TT_VertHeader* header;
FT_Byte* p;
FT_Byte* limit;
FT_UShort k;
header = &face->vertical;
p = face->vert_metrics;
limit = p + face->vert_metrics_size;
k = header->number_Of_VMetrics;
if ( k > 0 )
{
if ( idx < (FT_UInt)k )
{
p += 4 * idx;
if ( p + 4 > limit )
goto NoData;
*aadvance = FT_NEXT_USHORT( p );
*abearing = FT_NEXT_SHORT( p );
}
else
{
p += 4 * ( k - 1 );
if ( p + 4 > limit )
goto NoData;
*aadvance = FT_NEXT_USHORT( p );
p += 2 + 2 * ( idx - k );
if ( p + 2 > limit )
*abearing = 0;
else
*abearing = FT_PEEK_SHORT( p );
}
}
else
{
NoData:
*abearing = 0;
*aadvance = 0;
}
}
#else /* !FT_OPTIMIZE_MEMORY */
static void
cff_face_get_vertical_metrics( TT_Face face,
FT_UInt idx,
FT_Short *abearing,
FT_UShort *aadvance )
{
TT_VertHeader* header = &face->vertical;
TT_LongMetrics longs_m;
FT_UShort k = header->number_Of_VMetrics;
if ( k == 0 )
{
*abearing = *aadvance = 0;
return;
}
if ( idx < (FT_UInt)k )
{
longs_m = (TT_LongMetrics)header->long_metrics + idx;
*abearing = longs_m->bearing;
*aadvance = longs_m->advance;
}
else
{
*abearing = ((TT_ShortMetrics*)header->short_metrics)[idx - k];
*aadvance = ((TT_LongMetrics)header->long_metrics)[k - 1].advance;
}
}
#endif /* !FT_OPTIMIZE_MEMORY */
static FT_Error
cff_get_glyph_data( TT_Face face,
FT_UInt glyph_index,
@ -1299,7 +1410,7 @@
goto Fail;
args = stack;
while (args < decoder->top )
while ( args < decoder->top )
{
if ( phase )
x += args[0];
@ -1425,7 +1536,7 @@
goto Fail;
args = stack;
if (num_args < 4 || ( num_args % 4 ) > 1 )
if ( num_args < 4 || ( num_args % 4 ) > 1 )
goto Stack_Underflow;
if ( check_points( builder, ( num_args / 4 ) * 3 ) )
@ -1772,7 +1883,8 @@
/* close hints recording session */
if ( hinter )
{
if (hinter->close( hinter->hints, builder->current->n_points ) )
if ( hinter->close( hinter->hints,
builder->current->n_points ) )
goto Syntax_Error;
/* apply hints to the loaded glyph outline now */
@ -2048,7 +2160,7 @@
case cff_op_ifelse:
{
FT_Fixed cond = (args[2] <= args[3]);
FT_Fixed cond = ( args[2] <= args[3] );
FT_TRACE4(( " ifelse" ));
@ -2268,22 +2380,6 @@
#endif /* 0 */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********** *********/
/********** *********/
/********** UNHINTED GLYPH LOADER *********/
/********** *********/
/********** The following code is in charge of loading a *********/
/********** single outline. It completely ignores hinting *********/
/********** and is used when FT_LOAD_NO_HINTING is set. *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( FT_Error )
cff_slot_load( CFF_GlyphSlot glyph,
CFF_Size size,
@ -2515,8 +2611,26 @@
/* make up vertical ones */
metrics->vertAdvance = 0;
metrics->vertBearingX = 0;
metrics->vertBearingY = 0;
glyph->root.linearVertAdvance = 0;
/* get the vertical metrics from the vtmx table if we have one */
if ( face->vertical_info &&
face->vertical.number_Of_VMetrics > 0 &&
face->vertical.long_metrics != 0 )
{
FT_Short vertBearingY = 0;
FT_UShort vertAdvance = 0;
cff_face_get_vertical_metrics( face, glyph_index,
&vertBearingY, &vertAdvance );
metrics->vertBearingY = vertBearingY;
metrics->vertAdvance = vertAdvance;
}
glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
glyph->root.outline.flags = 0;
@ -2536,6 +2650,7 @@
advance.y = 0;
FT_Vector_Transform( &advance, &font_matrix );
metrics->horiAdvance = advance.x + font_offset.x;
advance.x = 0;
advance.y = metrics->vertAdvance;
FT_Vector_Transform( &advance, &font_matrix );
@ -2560,8 +2675,8 @@
}
/* Then scale the metrics */
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
}
/* compute the other metrics */
@ -2573,10 +2688,6 @@
metrics->horiBearingX = cbox.xMin;
metrics->horiBearingY = cbox.yMax;
/* make up vertical ones */
metrics->vertBearingX = 0;
metrics->vertBearingY = 0;
if ( hinting )
ft_glyphslot_grid_fit_metrics( &glyph->root );
}