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Third Party Harfbuzz
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8e9fd6f1
T
Third Party Harfbuzz
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体验新版 GitCode,发现更多精彩内容 >>
提交
8e9fd6f1
编写于
2月 07, 2018
作者:
G
Garret Rieger
提交者:
Behdad Esfahbod
2月 08, 2018
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差异文件
Implement basic loca (long version only) subsetting.
上级
f9c665fe
变更
1
显示空白变更内容
内联
并排
Showing
1 changed file
with
46 addition
and
20 deletion
+46
-20
src/hb-subset-glyf.cc
src/hb-subset-glyf.cc
+46
-20
未找到文件。
src/hb-subset-glyf.cc
浏览文件 @
8e9fd6f1
...
...
@@ -30,36 +30,48 @@
#include "hb-subset-glyf.hh"
bool
_calculate_glyf_prime_size
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
_calculate_glyf_
and_loca_
prime_size
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
hb_set_t
*
glyph_ids
,
unsigned
int
*
size
/* OUT */
)
unsigned
int
*
glyf_size
/* OUT */
,
unsigned
int
*
loca_size
/* OUT */
)
{
unsigned
int
total
=
0
;
unsigned
int
count
=
0
;
hb_codepoint_t
next_glyph
=
-
1
;
while
(
hb_set_next
(
glyph_ids
,
&
next_glyph
))
{
unsigned
int
start_offset
,
end_offset
;
if
(
unlikely
(
!
glyf
.
get_offsets
(
next_glyph
,
&
start_offset
,
&
end_offset
)))
{
*
size
=
0
;
*
glyf_size
=
0
;
*
loca_size
=
sizeof
(
OT
::
HBUINT32
);
return
false
;
}
total
+=
end_offset
-
start_offset
;
count
++
;
}
*
size
=
total
;
*
glyf_size
=
total
;
*
loca_size
=
(
count
+
1
)
*
sizeof
(
OT
::
HBUINT32
);
return
true
;
}
bool
_write_glyf_prime
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
_write_glyf_
and_loca_
prime
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
const
char
*
glyf_data
,
hb_set_t
*
glyph_ids
,
const
hb_set_t
*
glyph_ids
,
int
glyf_prime_size
,
char
*
glyf_prime_data
/* OUT */
)
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
;
while
(
hb_set_next
(
glyph_ids
,
&
next_glyph
))
{
unsigned
int
start_offset
,
end_offset
;
if
(
unlikely
(
!
glyf
.
get_offsets
(
next_glyph
,
&
start_offset
,
&
end_offset
)))
{
...
...
@@ -68,33 +80,42 @@ _write_glyf_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
);
glyf_prime_data_next
+=
length
;
new_glyph_id
++
;
}
return
true
;
}
bool
_hb_subset_glyf
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
_hb_subset_glyf
_and_loca
(
const
OT
::
glyf
::
accelerator_t
&
glyf
,
const
char
*
glyf_data
,
hb_set_t
*
glyphs_to_retain
,
hb_blob_t
**
glyf_prime
/* OUT */
)
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): Subset loca simultaneously.
// TODO(grieger): Don't fail on bad offsets, just dump them.
// TODO(grieger): Support short loca output.
unsigned
int
glyf_prime_size
;
if
(
unlikely
(
!
_calculate_glyf_prime_size
(
glyf
,
unsigned
int
loca_prime_size
;
if
(
unlikely
(
!
_calculate_glyf_and_loca_prime_size
(
glyf
,
glyphs_to_retain
,
&
glyf_prime_size
)))
{
&
glyf_prime_size
,
&
loca_prime_size
)))
{
return
false
;
}
char
*
glyf_prime_data
=
(
char
*
)
calloc
(
glyf_prime_size
,
1
);
if
(
unlikely
(
!
_write_glyf_prime
(
glyf
,
glyf_data
,
glyphs_to_retain
,
glyf_prime_size
,
glyf_prime_data
)))
{
char
*
loca_prime_data
=
(
char
*
)
calloc
(
loca_prime_size
,
1
);
if
(
unlikely
(
!
_write_glyf_and_loca_prime
(
glyf
,
glyf_data
,
glyphs_to_retain
,
glyf_prime_size
,
glyf_prime_data
,
loca_prime_size
,
loca_prime_data
)))
{
free
(
glyf_prime_data
);
return
false
;
}
...
...
@@ -104,6 +125,11 @@ _hb_subset_glyf (const OT::glyf::accelerator_t &glyf,
HB_MEMORY_MODE_READONLY
,
glyf_prime_data
,
free
);
*
loca_prime
=
hb_blob_create
(
loca_prime_data
,
loca_prime_size
,
HB_MEMORY_MODE_READONLY
,
loca_prime_data
,
free
);
return
true
;
}
...
...
@@ -126,7 +152,7 @@ hb_subset_glyf_and_loca (hb_subset_plan_t *plan,
OT
::
glyf
::
accelerator_t
glyf
;
glyf
.
init
(
face
);
bool
result
=
_hb_subset_glyf
(
glyf
,
glyf_data
,
plan
->
glyphs_to_retain
,
glyf
_prime
);
bool
result
=
_hb_subset_glyf
_and_loca
(
glyf
,
glyf_data
,
plan
->
glyphs_to_retain
,
glyf_prime
,
loca
_prime
);
glyf
.
fini
();
// TODO(grieger): Subset loca
...
...
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