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Some formatting and improvements of comments.

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This commit is contained in:
Werner Lemberg 2010-11-22 19:30:41 +01:00
parent 9f5dd61bf3
commit 9871b849dd
1 changed files with 46 additions and 21 deletions
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67
src/truetype/ttobjs.c
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@ -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 )
@ -200,15 +208,18 @@
}
/* 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 )
{
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 );
}
@ -224,19 +235,23 @@
{
FT_ULong CheckSum;
FT_ULong Length;
} tt_sfnt_id_rec;
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;