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Match backtrack context against the output glyphs not the input glyphs 

Mon Jul 26 15:16:07 2004  Owen Taylor  <otaylor@redhat.com>

        * pango/opentype/ftxgsub.c (Lookup_ChainContextSubst[123]):
        Match backtrack context against the output glyphs not
        the input glyphs (#145174, Aamir Wali)
This commit is contained in:
Owen Taylor 2004-07-26 19:20:27 +00:00 committed by Owen Taylor
parent 78282cda00
commit ed3e1f278d
1 changed files with 12 additions and 12 deletions
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24
src/ftxgsub.c
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@ -3207,7 +3207,7 @@
/* check whether context is too long; it is a first guess only */ /* check whether context is too long; it is a first guess only */
if ( bgc > buffer->in_pos || buffer->in_pos + igc + lgc > buffer->in_length ) if ( bgc > buffer->out_pos || buffer->in_pos + igc + lgc > buffer->in_length )
goto next_chainsubrule; goto next_chainsubrule;
if ( bgc ) if ( bgc )
@ -3215,9 +3215,9 @@
/* 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 */ we search backwards for matches in the backtrack glyph array */
for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- ) for ( i = 0, j = buffer->out_pos - 1; i < bgc; i++, j-- )
{ {
while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) ) while ( CHECK_Property( gdef, OUT_ITEM( j ), flags, &property ) )
{ {
if ( error && error != TTO_Err_Not_Covered ) if ( error && error != TTO_Err_Not_Covered )
return error; return error;
@ -3237,7 +3237,7 @@
Backtrack offsets - 3 2 1 0 Backtrack offsets - 3 2 1 0
Lookahead offsets - 0 1 2 3 */ Lookahead offsets - 0 1 2 3 */
if ( IN_GLYPH( j ) != curr_csr.Backtrack[i] ) if ( OUT_GLYPH( j ) != curr_csr.Backtrack[i] )
goto next_chainsubrule; goto next_chainsubrule;
} }
} }
@ -3373,7 +3373,7 @@
/* check whether context is too long; it is a first guess only */ /* check whether context is too long; it is a first guess only */
if ( bgc > buffer->in_pos || buffer->in_pos + igc + lgc > buffer->in_length ) if ( bgc > buffer->out_pos || buffer->in_pos + igc + lgc > buffer->in_length )
goto next_chainsubclassrule; goto next_chainsubclassrule;
if ( bgc ) if ( bgc )
@ -3384,9 +3384,9 @@
bc = ccsr.Backtrack; bc = ccsr.Backtrack;
for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- ) for ( i = 0, j = buffer->out_pos - 1; i < bgc; i++, j-- )
{ {
while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) ) while ( CHECK_Property( gdef, OUT_ITEM( j ), flags, &property ) )
{ {
if ( error && error != TTO_Err_Not_Covered ) if ( error && error != TTO_Err_Not_Covered )
goto End1; goto End1;
@ -3400,7 +3400,7 @@
{ {
/* Keeps us from having to do this for each rule */ /* Keeps us from having to do this for each rule */
error = Get_Class( &ccsf2->BacktrackClassDef, IN_GLYPH( j ), error = Get_Class( &ccsf2->BacktrackClassDef, OUT_GLYPH( j ),
&backtrack_classes[i], NULL ); &backtrack_classes[i], NULL );
if ( error && error != TTO_Err_Not_Covered ) if ( error && error != TTO_Err_Not_Covered )
goto End1; goto End1;
@ -3528,7 +3528,7 @@
/* check whether context is too long; it is a first guess only */ /* check whether context is too long; it is a first guess only */
if ( bgc > buffer->in_pos || buffer->in_pos + igc + lgc > buffer->in_length ) if ( bgc > buffer->out_pos || buffer->in_pos + igc + lgc > buffer->in_length )
return TTO_Err_Not_Covered; return TTO_Err_Not_Covered;
if ( bgc ) if ( bgc )
@ -3538,9 +3538,9 @@
bc = ccsf3->BacktrackCoverage; bc = ccsf3->BacktrackCoverage;
for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- ) for ( i = 0, j = buffer->out_pos - 1; i < bgc; i++, j-- )
{ {
while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) ) while ( CHECK_Property( gdef, OUT_ITEM( j ), flags, &property ) )
{ {
if ( error && error != TTO_Err_Not_Covered ) if ( error && error != TTO_Err_Not_Covered )
return error; return error;
@ -3550,7 +3550,7 @@
j--; j--;
} }
error = Coverage_Index( &bc[i], IN_GLYPH( j ), &index ); error = Coverage_Index( &bc[i], OUT_GLYPH( j ), &index );
if ( error ) if ( error )
return error; return error;
} }