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Third Party Harfbuzz
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a7f15959
T
Third Party Harfbuzz
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体验新版 GitCode,发现更多精彩内容 >>
提交
a7f15959
编写于
11月 14, 2017
作者:
B
Behdad Esfahbod
浏览文件
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差异文件
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1
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并排
Showing
1 changed file
with
38 addition
and
38 deletion
+38
-38
src/hb-ot-hmtx-table.hh
src/hb-ot-hmtx-table.hh
+38
-38
未找到文件。
src/hb-ot-hmtx-table.hh
浏览文件 @
a7f15959
...
...
@@ -67,20 +67,14 @@ struct hmtxvmtx
struct
accelerator_t
{
const
hmtxvmtx
*
table
;
hb_blob_t
*
blob
;
const
HVARVVAR
*
var
;
hb_blob_t
*
var_blob
;
inline
void
init
(
hb_face_t
*
face
,
hb_tag_t
_hea_tag
,
hb_tag_t
_mtx_tag
,
hb_tag_t
_var_tag
,
hb_tag_t
os2_tag
,
unsigned
int
default_advance
=
0
)
unsigned
int
default_advance
_
=
0
)
{
this
->
default_advance
=
default_advance
?
default_advance
:
face
->
get_upem
();
default_advance
=
default_advance_
?
default_advance_
:
face
->
get_upem
();
bool
got_font_extents
=
false
;
if
(
os2_tag
)
...
...
@@ -90,72 +84,72 @@ struct hmtxvmtx
#define USE_TYPO_METRICS (1u<<7)
if
(
0
!=
(
os2_table
->
fsSelection
&
USE_TYPO_METRICS
))
{
this
->
ascender
=
os2_table
->
sTypoAscender
;
this
->
descender
=
os2_table
->
sTypoDescender
;
this
->
line_gap
=
os2_table
->
sTypoLineGap
;
got_font_extents
=
(
this
->
ascender
|
this
->
descender
)
!=
0
;
ascender
=
os2_table
->
sTypoAscender
;
descender
=
os2_table
->
sTypoDescender
;
line_gap
=
os2_table
->
sTypoLineGap
;
got_font_extents
=
(
ascender
|
descender
)
!=
0
;
}
hb_blob_destroy
(
os2_blob
);
}
hb_blob_t
*
_hea_blob
=
Sanitizer
<
_hea
>::
sanitize
(
face
->
reference_table
(
_hea_tag
));
const
_hea
*
_hea_table
=
Sanitizer
<
_hea
>::
lock_instance
(
_hea_blob
);
this
->
num_advances
=
_hea_table
->
numberOfLongMetrics
;
num_advances
=
_hea_table
->
numberOfLongMetrics
;
if
(
!
got_font_extents
)
{
this
->
ascender
=
_hea_table
->
ascender
;
this
->
descender
=
_hea_table
->
descender
;
this
->
line_gap
=
_hea_table
->
lineGap
;
got_font_extents
=
(
this
->
ascender
|
this
->
descender
)
!=
0
;
ascender
=
_hea_table
->
ascender
;
descender
=
_hea_table
->
descender
;
line_gap
=
_hea_table
->
lineGap
;
got_font_extents
=
(
ascender
|
descender
)
!=
0
;
}
hb_blob_destroy
(
_hea_blob
);
this
->
has_font_extents
=
got_font_extents
;
has_font_extents
=
got_font_extents
;
this
->
blob
=
Sanitizer
<
hmtxvmtx
>::
sanitize
(
face
->
reference_table
(
_mtx_tag
));
blob
=
Sanitizer
<
hmtxvmtx
>::
sanitize
(
face
->
reference_table
(
_mtx_tag
));
/* Cap num_metrics() and num_advances() based on table length. */
unsigned
int
len
=
hb_blob_get_length
(
this
->
blob
);
if
(
unlikely
(
this
->
num_advances
*
4
>
len
))
this
->
num_advances
=
len
/
4
;
this
->
num_metrics
=
this
->
num_advances
+
(
len
-
4
*
this
->
num_advances
)
/
2
;
unsigned
int
len
=
hb_blob_get_length
(
blob
);
if
(
unlikely
(
num_advances
*
4
>
len
))
num_advances
=
len
/
4
;
num_metrics
=
num_advances
+
(
len
-
4
*
num_advances
)
/
2
;
/* We MUST set num_metrics to zero if num_advances is zero.
* Our get_advance() depends on that. */
if
(
unlikely
(
!
this
->
num_advances
))
if
(
unlikely
(
!
num_advances
))
{
this
->
num_metrics
=
this
->
num_advances
=
0
;
hb_blob_destroy
(
this
->
blob
);
this
->
blob
=
hb_blob_get_empty
();
num_metrics
=
num_advances
=
0
;
hb_blob_destroy
(
blob
);
blob
=
hb_blob_get_empty
();
}
t
his
->
table
=
Sanitizer
<
hmtxvmtx
>::
lock_instance
(
this
->
blob
);
t
able
=
Sanitizer
<
hmtxvmtx
>::
lock_instance
(
blob
);
this
->
var_blob
=
Sanitizer
<
HVARVVAR
>::
sanitize
(
face
->
reference_table
(
_var_tag
));
this
->
var
=
Sanitizer
<
HVARVVAR
>::
lock_instance
(
this
->
var_blob
);
var_blob
=
Sanitizer
<
HVARVVAR
>::
sanitize
(
face
->
reference_table
(
_var_tag
));
var_table
=
Sanitizer
<
HVARVVAR
>::
lock_instance
(
var_blob
);
}
inline
void
fini
(
void
)
{
hb_blob_destroy
(
this
->
blob
);
hb_blob_destroy
(
this
->
var_blob
);
hb_blob_destroy
(
blob
);
hb_blob_destroy
(
var_blob
);
}
inline
unsigned
int
get_advance
(
hb_codepoint_t
glyph
,
hb_font_t
*
font
)
const
{
if
(
unlikely
(
glyph
>=
this
->
num_metrics
))
if
(
unlikely
(
glyph
>=
num_metrics
))
{
/* If
this->
num_metrics is zero, it means we don't have the metrics table
/* If num_metrics is zero, it means we don't have the metrics table
* for this direction: return default advance. Otherwise, it means that the
* glyph index is out of bound: return zero. */
if
(
this
->
num_metrics
)
if
(
num_metrics
)
return
0
;
else
return
this
->
default_advance
;
return
default_advance
;
}
return
t
his
->
table
->
longMetric
[
MIN
(
glyph
,
(
uint32_t
)
this
->
num_advances
-
1
)].
advance
+
this
->
var
->
get_advance_var
(
glyph
,
font
->
coords
,
font
->
num_coords
);
// TODO Optimize?!
return
t
able
->
longMetric
[
MIN
(
glyph
,
(
uint32_t
)
num_advances
-
1
)].
advance
+
var_table
->
get_advance_var
(
glyph
,
font
->
coords
,
font
->
num_coords
);
// TODO Optimize?!
}
public:
...
...
@@ -163,10 +157,16 @@ struct hmtxvmtx
unsigned
short
ascender
;
unsigned
short
descender
;
unsigned
short
line_gap
;
private:
unsigned
int
num_metrics
;
unsigned
int
num_advances
;
unsigned
int
default_advance
;
const
hmtxvmtx
*
table
;
hb_blob_t
*
blob
;
const
HVARVVAR
*
var_table
;
hb_blob_t
*
var_blob
;
};
protected:
...
...
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