ref: 9871b849dd4918507dc80781717d26564bbbe8bf
parent: 9f5dd61bf3deee315da14d3aca7f436bbf9cc76a
author: Werner Lemberg <[email protected]>
date: Mon Nov 22 14:30:41 EST 2010
Some formatting and improvements of comments.
--- a/src/truetype/ttobjs.c
+++ b/src/truetype/ttobjs.c
@@ -149,9 +149,12 @@
static FT_Bool
tt_check_trickyness_family( FT_String* name )
{+
#define TRICK_NAMES_MAX_CHARACTERS 16
-#define TRICK_NAMES_COUNT 8
- static const char trick_names[TRICK_NAMES_COUNT][TRICK_NAMES_MAX_CHARACTERS+1] =
+#define TRICK_NAMES_COUNT 8
+
+ static const char trick_names[TRICK_NAMES_COUNT]
+ [TRICK_NAMES_MAX_CHARACTERS + 1] =
{"DFKaiSho-SB", /* dfkaisb.ttf */
"DFKaiShu",
@@ -162,7 +165,10 @@
"PMingLiU", /* mingliu.ttc */
"MingLi43", /* mingli.ttf */
};
+
int nn;
+
+
for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ )
if ( ft_strstr( name, trick_names[nn] ) )
return TRUE;
@@ -171,11 +177,13 @@
}
- /* XXX: this function should be in sfnt module */
- /* some PDF generators clear the checksum in TrueType header */
- /* (Quartz ContextPDF clears all, Bullzip PDF Printer clears */
- /* for the subsetted subtables), we have to recalculate when */
- /* it is cleared. */
+ /* XXX: This function should be in the `sfnt' module. */
+
+ /* Some PDF generators clear the checksums in the TrueType header table. */
+ /* For example, Quartz ContextPDF clears all entries, or Bullzip PDF */
+ /* Printer clears the entries for subsetted subtables. We thus have to */
+ /* recalculate the checksums where necessary. */
+
static FT_UInt32
tt_synth_sfnt_checksum( FT_Stream stream,
FT_ULong length )
@@ -200,7 +208,8 @@
}
- /* XXX: this function should be in sfnt module */
+ /* XXX: This function should be in the `sfnt' module. */
+
static FT_ULong
tt_get_sfnt_checksum( TT_Face face,
FT_UShort i )
@@ -207,8 +216,10 @@
{if ( face->dir_tables[i].CheckSum )
return face->dir_tables[i].CheckSum;
+
else if ( !face->goto_table )
return 0;
+
else if ( !face->goto_table( face,
face->dir_tables[i].Tag,
face->root.stream,
@@ -216,7 +227,7 @@
return 0;
return (FT_ULong)tt_synth_sfnt_checksum( face->root.stream,
- face->dir_tables[i].Length );
+ face->dir_tables[i].Length );
}
@@ -224,6 +235,7 @@
{FT_ULong CheckSum;
FT_ULong Length;
+
} tt_sfnt_id_rec;
@@ -230,13 +242,16 @@
static FT_Bool
tt_check_trickyness_sfnt_ids( TT_Face face )
{-#define TRICK_SFNT_IDS_PER_FACE 3
-#define TRICK_SFNT_IDS_NUM_FACES 5
+#define TRICK_SFNT_IDS_PER_FACE 3
+#define TRICK_SFNT_IDS_NUM_FACES 5
+
static const tt_sfnt_id_rec sfnt_id[TRICK_SFNT_IDS_NUM_FACES]
[TRICK_SFNT_IDS_PER_FACE] = {-#define TRICK_SFNT_ID_cvt 0
-#define TRICK_SFNT_ID_fpgm 1
-#define TRICK_SFNT_ID_prep 2
+
+#define TRICK_SFNT_ID_cvt 0
+#define TRICK_SFNT_ID_fpgm 1
+#define TRICK_SFNT_ID_prep 2
+
{ /* MingLiU 1995 */ { 0x05bcf058, 0x000002e4 }, /* cvt */ { 0x28233bf1, 0x000087c4 }, /* fpgm */@@ -263,36 +278,46 @@
{ 0x70020112, 0x00000008 } /* prep */}
};
+
FT_ULong checksum;
int num_matched_ids[TRICK_SFNT_IDS_NUM_FACES];
int i, j, k;
- FT_MEM_SET( num_matched_ids, 0, sizeof( int ) * TRICK_SFNT_IDS_NUM_FACES );
+ FT_MEM_SET( num_matched_ids, 0,
+ sizeof( int ) * TRICK_SFNT_IDS_NUM_FACES );
+
for ( i = 0; i < face->num_tables; i++ )
{checksum = 0;
+
switch( face->dir_tables[i].Tag )
{case TTAG_cvt:
k = TRICK_SFNT_ID_cvt;
break;
+
case TTAG_fpgm:
k = TRICK_SFNT_ID_fpgm;
break;
+
case TTAG_prep:
k = TRICK_SFNT_ID_prep;
break;
+
default:
continue;
}
+
for ( j = 0; j < TRICK_SFNT_IDS_NUM_FACES; j++ )
if ( face->dir_tables[i].Length == sfnt_id[j][k].Length )
{if ( !checksum )
checksum = tt_get_sfnt_checksum( face, i );
+
if ( sfnt_id[j][k].CheckSum == checksum )
- num_matched_ids[j] ++;
+ num_matched_ids[j]++;
+
if ( num_matched_ids[j] == TRICK_SFNT_IDS_PER_FACE )
return TRUE;
}
@@ -308,8 +333,7 @@
if ( !face )
return FALSE;
- /* Note that we only check the face name at the moment; it might */
- /* be worth to do more checks for a few special cases. */
+ /* First, check the face name. */
if ( face->family_name )
{if ( tt_check_trickyness_family( face->family_name ) )
@@ -318,9 +342,10 @@
return FALSE;
}
- /* Type42 may lack `name' tables, try to identfiy tricky fonts by */
- /* the checksums of Type42-persistent sfnt tables; cvt, fpgm, prep */
- if ( tt_check_trickyness_sfnt_ids( ( TT_Face )face ) )
+ /* Type42 fonts may lack `name' tables, we thus try to identify */
+ /* tricky fonts by checking the checksums of Type42-persistent */
+ /* sfnt tables (`cvt', `fpgm', and `prep'). */
+ if ( tt_check_trickyness_sfnt_ids( (TT_Face)face ) )
return TRUE;
return FALSE;