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[truetype] Speed up `TT_Load_Glyph'.

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This avoids additional calls to `tt_face_lookup_table' for the
`glyf' table, which can be expensive.

* include/freetype/internal/tttypes.h (TT_LoaderRec): Move
`glyf_offset' field to ...
(TT_FaceRec): ... this structure.
* src/truetype/ttgload.c (load_truetype_glyph): Updated.
(tt_loader_init): Move initialization of `glyf_offset' to ...
* src/truetype/ttpload.c (tt_face_load_loca): .. this function.
This commit is contained in:
Werner Lemberg 2016-09-27 21:21:01 +02:00
parent 0d94592942
commit e27b8a5598
4 changed files with 32 additions and 32 deletions
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14
ChangeLog
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@ -1,3 +1,17 @@
2016-09-27 Werner Lemberg <wl@gnu.org>
[truetype] Speed up `TT_Load_Glyph'.
This avoids additional calls to `tt_face_lookup_table' for the
`glyf' table, which can be expensive.
* include/freetype/internal/tttypes.h (TT_LoaderRec): Move
`glyf_offset' field to ...
(TT_FaceRec): ... this structure.
* src/truetype/ttgload.c (load_truetype_glyph): Updated.
(tt_loader_init): Move initialization of `glyf_offset' to ...
* src/truetype/ttpload.c (tt_face_load_loca): .. this function.
2016-09-27 Werner Lemberg <wl@gnu.org>
[truetype] Introduce dynamic limits for some bytecode opcodes.

3
include/freetype/internal/tttypes.h
View File

@ -1344,6 +1344,7 @@ FT_BEGIN_HEADER
const char* postscript_name;
FT_ULong glyf_len;
FT_ULong glyf_offset; /* since 2.7.1 */
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
FT_Bool doblend;
@ -1492,8 +1493,6 @@ FT_BEGIN_HEADER
FT_Vector pp1;
FT_Vector pp2;
FT_ULong glyf_offset;
/* the zone where we load our glyphs */
TT_GlyphZoneRec base;
TT_GlyphZoneRec zone;

32
src/truetype/ttgload.c
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@ -1505,10 +1505,10 @@
{
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* for the incremental interface, `glyf_offset' is always zero */
if ( !loader->glyf_offset &&
if ( !face->glyf_offset &&
!face->root.internal->incremental_interface )
#else
if ( !loader->glyf_offset )
if ( !face->glyf_offset )
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
{
FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));
@ -1517,7 +1517,7 @@
}
error = face->access_glyph_frame( loader, glyph_index,
loader->glyf_offset + offset,
face->glyf_offset + offset,
(FT_UInt)loader->byte_len );
if ( error )
goto Exit;
@ -2497,32 +2497,6 @@
#endif /* TT_USE_BYTECODE_INTERPRETER */
/* seek to the beginning of the glyph table -- for Type 42 fonts */
/* the table might be accessed from a Postscript stream or something */
/* else... */
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( face->root.internal->incremental_interface )
loader->glyf_offset = 0;
else
#endif
{
error = face->goto_table( face, TTAG_glyf, stream, 0 );
if ( FT_ERR_EQ( error, Table_Missing ) )
loader->glyf_offset = 0;
else if ( error )
{
FT_ERROR(( "tt_loader_init: could not access glyph table\n" ));
return error;
}
else
loader->glyf_offset = FT_STREAM_POS();
}
/* get face's glyph loader */
if ( !glyf_table_only )
{

15
src/truetype/ttpload.c
View File

@ -73,9 +73,22 @@
/* it is possible that a font doesn't have a glyf table at all */
/* or its size is zero */
if ( FT_ERR_EQ( error, Table_Missing ) )
face->glyf_len = 0;
{
face->glyf_len = 0;
face->glyf_offset = 0;
}
else if ( error )
goto Exit;
else
{
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( face->root.internal->incremental_interface )
face->glyf_offset = 0;
else
#endif
face->glyf_offset = FT_STREAM_POS();
}
FT_TRACE2(( "Locations " ));
error = face->goto_table( face, TTAG_loca, stream, &table_len );