diff options
Diffstat (limited to 'pango/opentype/ftxgsub.c')
| -rw-r--r-- | pango/opentype/ftxgsub.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/pango/opentype/ftxgsub.c b/pango/opentype/ftxgsub.c index 148b3a6c..f56ae6f1 100644 --- a/pango/opentype/ftxgsub.c +++ b/pango/opentype/ftxgsub.c @@ -3423,13 +3423,13 @@ if ( bgc ) { - /* Since we don't know in advance the number of glyphs to inspect, + /* since we don't know in advance the number of glyphs to inspect, we search backwards for matches in the backtrack glyph array */ curr_pos = 0; s_in = &in->string[curr_pos]; - for ( i = bgc, j = in->pos - 1; i > 0; i--, j-- ) + for ( i = 0, j = in->pos - 1; i < bgc; i++, j-- ) { while ( CHECK_Property( gdef, s_in[j], flags, &property ) ) { @@ -3442,11 +3442,21 @@ break; } - if ( s_in[j] != curr_csr.Backtrack[i - 1] ) + /* In OpenType 1.3, it is undefined whether the offsets of + backtrack glyphs is in logical order or not. Version 1.4 + will clarify this: + + Logical order - a b c d e f g h i j + i + Input offsets - 0 1 + Backtrack offsets - 3 2 1 0 + Lookahead offsets - 0 1 2 3 */ + + if ( s_in[j] != curr_csr.Backtrack[i] ) break; } - if ( i != 0 ) + if ( i != bgc ) continue; } @@ -3630,7 +3640,7 @@ known_backtrack_classes = i; } - if ( bc[bgc - 1 - i] != backtrack_classes[i] ) + if ( bc[i] != backtrack_classes[i] ) break; } @@ -3777,7 +3787,7 @@ s_in = &in->string[curr_pos]; bc = ccsf3->BacktrackCoverage; - for ( i = bgc, j = in->pos - 1; i > 0; i--, j-- ) + for ( i = 0, j = in->pos - 1; i < bgc; i++, j-- ) { while ( CHECK_Property( gdef, s_in[j], flags, &property ) ) { @@ -3790,7 +3800,7 @@ return TTO_Err_Not_Covered; } - error = Coverage_Index( &bc[i - 1], s_in[j], &index ); + error = Coverage_Index( &bc[i], s_in[j], &index ); if ( error ) return error; } |