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Third Party Harfbuzz
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d18decd2
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Third Party Harfbuzz
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体验新版 GitCode,发现更多精彩内容 >>
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d18decd2
编写于
2月 09, 2018
作者:
G
Garret Rieger
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电子邮件补丁
差异文件
In glyf subsetting add suport for writing out a short loca table when possible.
上级
9275bd03
变更
1
显示空白变更内容
内联
并排
Showing
1 changed file
with
33 addition
and
9 deletion
+33
-9
src/hb-subset-glyf.cc
src/hb-subset-glyf.cc
+33
-9
未找到文件。
src/hb-subset-glyf.cc
浏览文件 @
d18decd2
...
...
@@ -32,7 +32,8 @@
bool
_calculate_glyf_and_loca_prime_size
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
hb_auto_array_t
<
unsigned
int
>
&
glyph_ids
,
unsigned
int
*
glyf_size
/* OUT */
,
bool
*
use_short_loca
,
/* OUT */
unsigned
int
*
glyf_size
,
/* OUT */
unsigned
int
*
loca_size
/* OUT */
)
{
unsigned
int
total
=
0
;
...
...
@@ -51,23 +52,37 @@ _calculate_glyf_and_loca_prime_size (const OT::glyf::accelerator_t &glyf,
}
*
glyf_size
=
total
;
*
loca_size
=
(
count
+
1
)
*
sizeof
(
OT
::
HBUINT32
);
*
use_short_loca
=
(
total
<=
131070
);
*
loca_size
=
(
count
+
1
)
*
(
*
use_short_loca
?
sizeof
(
OT
::
HBUINT16
)
:
sizeof
(
OT
::
HBUINT32
));
DEBUG_MSG
(
SUBSET
,
nullptr
,
"preparing to subset glyf: final size %d, loca size %d, using %s loca"
,
total
,
*
loca_size
,
*
use_short_loca
?
"short"
:
"long"
);
return
true
;
}
void
_write_loca_entry
(
unsigned
int
id
,
unsigned
int
offset
,
bool
is_short
,
void
*
loca_prime
)
{
if
(
is_short
)
{
((
OT
::
HBUINT16
*
)
loca_prime
)
[
id
].
set
(
offset
/
2
);
}
else
{
((
OT
::
HBUINT32
*
)
loca_prime
)
[
id
].
set
(
offset
);
}
}
bool
_write_glyf_and_loca_prime
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
const
char
*
glyf_data
,
hb_auto_array_t
<
unsigned
int
>
&
glyph_ids
,
bool
use_short_loca
,
int
glyf_prime_size
,
char
*
glyf_prime_data
/* OUT */
,
int
loca_prime_size
,
char
*
loca_prime_data
/* OUT */
)
{
// TODO(grieger): Handle the missing character glyf and outline.
char
*
glyf_prime_data_next
=
glyf_prime_data
;
OT
::
HBUINT32
*
loca_prime
=
(
OT
::
HBUINT32
*
)
loca_prime_data
;
hb_codepoint_t
next_glyph
=
-
1
;
hb_codepoint_t
new_glyph_id
=
0
;
...
...
@@ -81,7 +96,8 @@ _write_glyf_and_loca_prime (const OT::glyf::accelerator_t &glyf,
int
length
=
end_offset
-
start_offset
;
memcpy
(
glyf_prime_data_next
,
glyf_data
+
start_offset
,
length
);
loca_prime
[
new_glyph_id
].
set
(
start_offset
);
_write_loca_entry
(
i
,
start_offset
,
use_short_loca
,
loca_prime_data
);
glyf_prime_data_next
+=
length
;
new_glyph_id
++
;
...
...
@@ -89,7 +105,7 @@ _write_glyf_and_loca_prime (const OT::glyf::accelerator_t &glyf,
// Add the last loca entry which doesn't correspond to a specific glyph
// but identifies the end of the last glyphs data.
loca_prime
[
new_glyph_id
].
set
(
end_offset
);
_write_loca_entry
(
new_glyph_id
,
end_offset
,
use_short_loca
,
loca_prime_data
);
return
true
;
}
...
...
@@ -98,18 +114,20 @@ bool
_hb_subset_glyf_and_loca
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
const
char
*
glyf_data
,
hb_auto_array_t
<
unsigned
int
>
&
glyphs_to_retain
,
bool
*
use_short_loca
,
hb_blob_t
**
glyf_prime
/* OUT */
,
hb_blob_t
**
loca_prime
/* OUT */
)
{
// TODO(grieger): Sanity check writes to make sure they are in-bounds.
// TODO(grieger): Sanity check allocation size for the new table.
// TODO(grieger): Don't fail on bad offsets, just dump them.
// TODO(grieger): Support short loca output.
unsigned
int
glyf_prime_size
;
unsigned
int
loca_prime_size
;
if
(
unlikely
(
!
_calculate_glyf_and_loca_prime_size
(
glyf
,
glyphs_to_retain
,
use_short_loca
,
&
glyf_prime_size
,
&
loca_prime_size
)))
{
return
false
;
...
...
@@ -118,6 +136,7 @@ _hb_subset_glyf_and_loca (const OT::glyf::accelerator_t &glyf,
char
*
glyf_prime_data
=
(
char
*
)
calloc
(
glyf_prime_size
,
1
);
char
*
loca_prime_data
=
(
char
*
)
calloc
(
loca_prime_size
,
1
);
if
(
unlikely
(
!
_write_glyf_and_loca_prime
(
glyf
,
glyf_data
,
glyphs_to_retain
,
*
use_short_loca
,
glyf_prime_size
,
glyf_prime_data
,
loca_prime_size
,
loca_prime_data
)))
{
free
(
glyf_prime_data
);
...
...
@@ -157,7 +176,12 @@ hb_subset_glyf_and_loca (hb_subset_plan_t *plan,
OT
::
glyf
::
accelerator_t
glyf
;
glyf
.
init
(
face
);
bool
result
=
_hb_subset_glyf_and_loca
(
glyf
,
glyf_data
,
plan
->
gids_to_retain_sorted
,
glyf_prime
,
loca_prime
);
bool
result
=
_hb_subset_glyf_and_loca
(
glyf
,
glyf_data
,
plan
->
gids_to_retain_sorted
,
use_short_loca
,
glyf_prime
,
loca_prime
);
glyf
.
fini
();
*
use_short_loca
=
false
;
...
...
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