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freetype2
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Code Issues 9 Releases Wiki Activity

Add type 3 lookup handling

This commit is contained in:
Craig White 2023-10-27 01:30:32 -04:00
parent 23daa69048
commit 99f56eed57
1 changed files with 91 additions and 16 deletions
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107
src/autofit/afadjust.c
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@ -55,7 +55,7 @@ adjustment_database[] =
{0xEC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
{0xED, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
{0xEE, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
{0xF1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1}, /*n with tilde*/
{0xF1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0}, /*n with tilde*/
{0xF2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
{0xF3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
{0xF4, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0},
@ -446,16 +446,31 @@ af_all_glyph_variants( FT_Face face,
hb_face_t *hb_face = hb_font_get_face( hb_font );
/*The set of all feature tags in the font*/
hb_set_t *feature_tags = hb_set_create();
hb_set_t *feature_tags = hb_set_create();
hb_set_t *type_3_lookup_indicies = hb_set_create();
hb_buffer_t *codepoint_buffer = hb_buffer_create();
hb_codepoint_t *type_3_alternate_glyphs_buffer;
if ( !hb_set_allocation_successful( feature_tags ) )
{
return FT_Err_Out_Of_Memory;
error = FT_Err_Out_Of_Memory;
goto Exit;
}
if ( !hb_buffer_allocation_successful( codepoint_buffer ) )
{
error = FT_Err_Out_Of_Memory;
goto Exit;
}
if ( !hb_set_allocation_successful ( type_3_lookup_indicies ) )
{
error = FT_Err_Out_Of_Memory;
goto Exit;
}
/*populate feature_tags using the output of hb_ot_layout_table_get_feature_tags*/
FT_Bool feature_list_done = 0;
unsigned int start_offset = 0;
while ( !feature_list_done ) {
while ( !feature_list_done )
{
unsigned int feature_count = 20;
hb_tag_t tags[20];
hb_ot_layout_table_get_feature_tags ( hb_face,
@ -474,31 +489,28 @@ af_all_glyph_variants( FT_Face face,
}
if ( !hb_set_allocation_successful( feature_tags ) )
{
return FT_Err_Out_Of_Memory;
error = FT_Err_Out_Of_Memory;
goto Exit;
}
}
/*make a buffer only consisting of the given codepoint*/
hb_buffer_t *codepoint_buffer = hb_buffer_create();
if ( !hb_buffer_allocation_successful( codepoint_buffer ) )
{
return FT_Err_Out_Of_Memory;
}
if ( !hb_buffer_pre_allocate( codepoint_buffer, 1 ) )
{
return FT_Err_Out_Of_Memory;
error = FT_Err_Out_Of_Memory;
goto Exit;
}
hb_buffer_set_direction (codepoint_buffer,
HB_DIRECTION_LTR);
hb_buffer_set_direction ( codepoint_buffer,
HB_DIRECTION_LTR );
hb_buffer_add( codepoint_buffer, codepoint, 0 );
/*The array of features that will be used by the recursive part
it will have at most as many entries as there are features, so
make the length = length of feature_tags*/
hb_feature_t *feature_buffer;
if ( FT_NEW_ARRAY( feature_buffer, hb_set_get_population( feature_tags ) ) )
if (( error = FT_NEW_ARRAY( feature_buffer, hb_set_get_population( feature_tags ) ) ))
{
return error;
goto Exit;
}
error = af_all_glyph_variants_helper( hb_font,
@ -507,10 +519,72 @@ af_all_glyph_variants( FT_Face face,
feature_buffer,
0,
result );
if ( error )
{
goto Exit;
}
/*
Add the alternative glyph forms that come from features using
type 3 lookups.
This file from gtk was very useful in figuring out my approach:
https://github.com/val-verde/gtk/blob/212e85e92628eda9f9650e5cc8d88c44062642ae/gtk/gtkfontchooserwidget.c#L2085
*/
/*list of features containing type 3 lookups:*/
hb_tag_t feature_list[] = {
HB_TAG('s','a','l','t'),
HB_TAG('s','w','s','h'),
HB_TAG('n','a','l','t'),
HB_TAG_NONE
};
hb_ot_layout_collect_lookups ( hb_face,
HB_OT_TAG_GSUB,
NULL,
NULL,
feature_list,
type_3_lookup_indicies);
if ( !hb_set_allocation_successful( type_3_lookup_indicies ) )
{
error = FT_Err_Out_Of_Memory;
goto Exit;
}
if (( error = FT_NEW_ARRAY( type_3_alternate_glyphs_buffer, 100 ) ))
{
goto Exit;
}
hb_codepoint_t lookup_index = HB_SET_VALUE_INVALID;
FT_UInt base_glyph_index = FT_Get_Char_Index( face, codepoint );
if ( base_glyph_index != 0 ) {
while ( hb_set_next( type_3_lookup_indicies, &lookup_index ) )
{
unsigned alternate_count = 100;
hb_ot_layout_lookup_get_glyph_alternates
( hb_face,
lookup_index,
base_glyph_index,
0,
&alternate_count,
type_3_alternate_glyphs_buffer );
for ( unsigned i = 0; i < alternate_count; i++ )
{
hb_set_add( result, type_3_alternate_glyphs_buffer[i] );
}
}
}
Exit:
hb_set_destroy( feature_tags );
hb_buffer_destroy( codepoint_buffer );
FT_FREE( feature_buffer );
FT_FREE( type_3_alternate_glyphs_buffer );
return error;
}
#endif /*FT_CONFIG_OPTION_USE_HARFBUZZ*/
@ -528,7 +602,8 @@ af_reverse_character_map_new( AF_ReverseCharacterMap *map, AF_FaceGlobals global
FT_Error error;
/* backup face->charmap because find_unicode_charmap sets it */
FT_CharMap old_charmap = face->charmap;
if ( ( error = find_unicode_charmap( face ) ) ) {
if ( ( error = find_unicode_charmap( face ) ) )
{
*map = NULL;
goto Exit;
}