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[freetype2] master 2b3ccd6 2/4: [truetype] New function to skip the rand
From: |
Werner Lemberg |
Subject: |
[freetype2] master 2b3ccd6 2/4: [truetype] New function to skip the randomization tag. |
Date: |
Tue, 24 Aug 2021 03:57:59 -0400 (EDT) |
branch: master
commit 2b3ccd6e266cc74740ee6157b643a0c409c5df64
Author: suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
Commit: suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
[truetype] New function to skip the randomization tag.
* src/truetype/ttobjs.c (tt_skip_pdffont_random_tag):
New function to skip the randomization tag in the names of the
fonts embedded in a PDF. It is used by tt_check_trickyness_family(),
to keep from mistaking "DLC" in the randomization tag as a
tricky font name. See discussion in:
https://lists.nongnu.org/archive/html/freetype-devel/2021-02/msg00002.html
For technical detail about the randomization tag, please find
PDF Reference 5.5.3 "Font Subsets". Thanks to Justyna Wawrzynska
for pointing out the issue caused by the randomization tag.
---
src/truetype/ttobjs.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/src/truetype/ttobjs.c b/src/truetype/ttobjs.c
index 9c3d583..7525cb2 100644
--- a/src/truetype/ttobjs.c
+++ b/src/truetype/ttobjs.c
@@ -143,6 +143,30 @@
#endif /* TT_USE_BYTECODE_INTERPRETER */
+ /* The fonts embedded in PDF changes their family names
+ * by the randomization tag. PDF Reference 5.5.3 "Font
+ * Subsets" defines its format as 6 uppercase letters and
+ * '+' sign. For safety, we do not skip the tag violating
+ * this rule.
+ */
+
+ static const FT_String*
+ tt_skip_pdffont_random_tag( const FT_String* name )
+ {
+ unsigned int i;
+
+
+ if ( name[6] != '+' )
+ return name;
+
+ for ( i = 0; i < 6; i++ )
+ if ( !ft_isupper( name[i] ) )
+ return name;
+
+ FT_TRACE7(( "name without randomization tag: %s\n", name + 7 ));
+ return name + 7;
+ }
+
/* Compare the face with a list of well-known `tricky' fonts. */
/* This list shall be expanded as we find more of them. */
@@ -199,10 +223,12 @@
};
int nn;
+ const FT_String* name_without_tag;
+ name_without_tag = tt_skip_pdffont_random_tag( name );
for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ )
- if ( ft_strstr( name, trick_names[nn] ) )
+ if ( ft_strstr( name_without_tag, trick_names[nn] ) )
return TRUE;
return FALSE;
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- [freetype2] master 2b3ccd6 2/4: [truetype] New function to skip the randomization tag.,
Werner Lemberg <=