Some formatting and improvements of comments.
This commit is contained in:
Werner Lemberg
parent
9f5dd61bf3
commit
9871b849dd
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@ -149,9 +149,12 @@
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static FT_Bool
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tt_check_trickyness_family( FT_String* name )
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{
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#define TRICK_NAMES_MAX_CHARACTERS 16
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#define TRICK_NAMES_COUNT 8
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static const char trick_names[TRICK_NAMES_COUNT][TRICK_NAMES_MAX_CHARACTERS+1] =
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#define TRICK_NAMES_COUNT 8
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static const char trick_names[TRICK_NAMES_COUNT]
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[TRICK_NAMES_MAX_CHARACTERS + 1] =
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{
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"DFKaiSho-SB", /* dfkaisb.ttf */
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"DFKaiShu",
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@ -162,7 +165,10 @@
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"PMingLiU", /* mingliu.ttc */
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"MingLi43", /* mingli.ttf */
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};
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int nn;
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for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ )
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if ( ft_strstr( name, trick_names[nn] ) )
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return TRUE;
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@ -171,11 +177,13 @@
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}
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/* XXX: this function should be in sfnt module */
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/* some PDF generators clear the checksum in TrueType header */
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/* (Quartz ContextPDF clears all, Bullzip PDF Printer clears */
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/* for the subsetted subtables), we have to recalculate when */
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/* it is cleared. */
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/* XXX: This function should be in the `sfnt' module. */
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/* Some PDF generators clear the checksums in the TrueType header table. */
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/* For example, Quartz ContextPDF clears all entries, or Bullzip PDF */
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/* Printer clears the entries for subsetted subtables. We thus have to */
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/* recalculate the checksums where necessary. */
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static FT_UInt32
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tt_synth_sfnt_checksum( FT_Stream stream,
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FT_ULong length )
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@ -200,15 +208,18 @@
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}
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/* XXX: this function should be in sfnt module */
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/* XXX: This function should be in the `sfnt' module. */
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static FT_ULong
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tt_get_sfnt_checksum( TT_Face face,
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FT_UShort i )
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{
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if ( face->dir_tables[i].CheckSum )
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return face->dir_tables[i].CheckSum;
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else if ( !face->goto_table )
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return 0;
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else if ( !face->goto_table( face,
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face->dir_tables[i].Tag,
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face->root.stream,
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@ -216,7 +227,7 @@
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return 0;
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return (FT_ULong)tt_synth_sfnt_checksum( face->root.stream,
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face->dir_tables[i].Length );
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face->dir_tables[i].Length );
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}
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@ -224,19 +235,23 @@
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{
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FT_ULong CheckSum;
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FT_ULong Length;
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} tt_sfnt_id_rec;
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static FT_Bool
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tt_check_trickyness_sfnt_ids( TT_Face face )
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{
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#define TRICK_SFNT_IDS_PER_FACE 3
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#define TRICK_SFNT_IDS_NUM_FACES 5
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#define TRICK_SFNT_IDS_PER_FACE 3
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#define TRICK_SFNT_IDS_NUM_FACES 5
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static const tt_sfnt_id_rec sfnt_id[TRICK_SFNT_IDS_NUM_FACES]
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[TRICK_SFNT_IDS_PER_FACE] = {
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#define TRICK_SFNT_ID_cvt 0
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#define TRICK_SFNT_ID_fpgm 1
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#define TRICK_SFNT_ID_prep 2
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#define TRICK_SFNT_ID_cvt 0
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#define TRICK_SFNT_ID_fpgm 1
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#define TRICK_SFNT_ID_prep 2
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{ /* MingLiU 1995 */
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{ 0x05bcf058, 0x000002e4 }, /* cvt */
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{ 0x28233bf1, 0x000087c4 }, /* fpgm */
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@ -263,36 +278,46 @@
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{ 0x70020112, 0x00000008 } /* prep */
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}
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};
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FT_ULong checksum;
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int num_matched_ids[TRICK_SFNT_IDS_NUM_FACES];
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int i, j, k;
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FT_MEM_SET( num_matched_ids, 0, sizeof( int ) * TRICK_SFNT_IDS_NUM_FACES );
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FT_MEM_SET( num_matched_ids, 0,
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sizeof( int ) * TRICK_SFNT_IDS_NUM_FACES );
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for ( i = 0; i < face->num_tables; i++ )
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{
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checksum = 0;
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switch( face->dir_tables[i].Tag )
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{
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case TTAG_cvt:
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k = TRICK_SFNT_ID_cvt;
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break;
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case TTAG_fpgm:
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k = TRICK_SFNT_ID_fpgm;
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break;
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case TTAG_prep:
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k = TRICK_SFNT_ID_prep;
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break;
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default:
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continue;
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}
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for ( j = 0; j < TRICK_SFNT_IDS_NUM_FACES; j++ )
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if ( face->dir_tables[i].Length == sfnt_id[j][k].Length )
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{
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if ( !checksum )
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checksum = tt_get_sfnt_checksum( face, i );
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if ( sfnt_id[j][k].CheckSum == checksum )
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num_matched_ids[j] ++;
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num_matched_ids[j]++;
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if ( num_matched_ids[j] == TRICK_SFNT_IDS_PER_FACE )
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return TRUE;
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}
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@ -308,8 +333,7 @@
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if ( !face )
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return FALSE;
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/* Note that we only check the face name at the moment; it might */
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/* be worth to do more checks for a few special cases. */
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/* First, check the face name. */
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if ( face->family_name )
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{
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if ( tt_check_trickyness_family( face->family_name ) )
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@ -318,9 +342,10 @@
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return FALSE;
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}
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/* Type42 may lack `name' tables, try to identfiy tricky fonts by */
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/* the checksums of Type42-persistent sfnt tables; cvt, fpgm, prep */
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if ( tt_check_trickyness_sfnt_ids( ( TT_Face )face ) )
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/* Type42 fonts may lack `name' tables, we thus try to identify */
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/* tricky fonts by checking the checksums of Type42-persistent */
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/* sfnt tables (`cvt', `fpgm', and `prep'). */
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if ( tt_check_trickyness_sfnt_ids( (TT_Face)face ) )
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return TRUE;
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return FALSE;
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