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[autofit] Implement and use `af_get_char_index' with HarfBuzz. 

* src/autofit/hbshim.c (COVERAGE) [FT_CONFIG_OPTION_USE_HARFBUZZ]:
Redefine to construct HarfBuzz features.
(af_get_char_index) [FT_CONFIG_OPTION_USE_HARFBUZZ]: Rewritten.

* src/autofit/aflatin.c (af_latin_metrics_init_blues): Use
`y_offset' to adjust `best_y'.
This commit is contained in:
Werner Lemberg 2014-01-01 07:10:36 +01:00
parent 785f38573b
commit 73cc8330ed
3 changed files with 98 additions and 7 deletions
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13
ChangeLog
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@ -1,3 +1,14 @@
2014-01-01 Werner Lemberg <wl@gnu.org>
[autofit] Implement and use `af_get_char_index' with HarfBuzz.
* src/autofit/hbshim.c (COVERAGE) [FT_CONFIG_OPTION_USE_HARFBUZZ]:
Redefine to construct HarfBuzz features.
(af_get_char_index) [FT_CONFIG_OPTION_USE_HARFBUZZ]: Rewritten.
* src/autofit/aflatin.c (af_latin_metrics_init_blues): Use
`y_offset' to adjust `best_y'.
2013-12-31 Werner Lemberg <wl@gnu.org>
[autofit] s/AF_STYLE_...._DEFAULT/AF_STYLE_...._DFLT/i.
@ -2595,7 +2606,7 @@
----------------------------------------------------------------------------
Copyright 2013 by
Copyright 2013-2014 by
David Turner, Robert Wilhelm, and Werner Lemberg.
This file is part of the FreeType project, and may only be used, modified,

8
src/autofit/aflatin.c
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@ -4,7 +4,7 @@
/* */
/* Auto-fitter hinting routines for latin writing system (body). */
/* */
/* Copyright 2003-2013 by */
/* Copyright 2003-2014 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -620,6 +620,12 @@
}
}
/* for computing blue zones, we add the y offset as returned */
/* by the currently used OpenType feature -- for example, */
/* superscript glyphs might be identical to subscript glyphs */
/* with a vertical shift */
best_y += y_offset;
FT_TRACE5(( " U+%04lX: best_y = %5ld", ch, best_y ));
/* now set the `round' flag depending on the segment's kind: */

82
src/autofit/hbshim.c
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@ -4,7 +4,7 @@
/* */
/* HarfBuzz interface for accessing OpenType features (body). */
/* */
/* Copyright 2013 by */
/* Copyright 2013, 2014 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -230,22 +230,96 @@
}
/* construct HarfBuzz features */
#undef COVERAGE
#define COVERAGE( name, NAME, description, \
tag1, tag2, tag3, tag4 ) \
static const hb_feature_t name ## _feature[] = \
{ \
{ \
HB_TAG( tag1, tag2, tag3, tag4 ), \
1, 0, -1 \
} \
};
#include "afcover.h"
/* define mapping between HarfBuzz features and AF_Coverage */
#undef COVERAGE
#define COVERAGE( name, NAME, description, \
tag1, tag2, tag3, tag4 ) \
name ## _feature,
static const hb_feature_t* features[] =
{
#include "afcover.h"
NULL /* AF_COVERAGE_DEFAULT */
};
FT_Error
af_get_char_index( AF_StyleMetrics metrics,
FT_ULong charcode,
FT_ULong *codepoint,
FT_Long *y_offset )
{
FT_Face face;
AF_StyleClass style_class;
const hb_feature_t* feature;
if ( !metrics )
return FT_THROW( Invalid_Argument );
face = metrics->globals->face;
style_class = metrics->style_class;
*codepoint = FT_Get_Char_Index( face, charcode );
feature = features[style_class->coverage];
if ( feature )
{
hb_font_t* font = metrics->globals->hb_font;
hb_buffer_t* buf = hb_buffer_create();
uint32_t c = (uint32_t)charcode;
hb_glyph_info_t* ginfo;
hb_glyph_position_t* gpos;
unsigned int gcount;
/* XXX: is this sufficient for a single character of any script? */
hb_buffer_set_direction( buf, HB_DIRECTION_LTR );
hb_buffer_set_script( buf, scripts[style_class->script] );
/* we add one character to `buf' ... */
hb_buffer_add_utf32( buf, &c, 1, 0, 1 );
/* ... and apply one feature */
hb_shape( font, buf, feature, 1 );
ginfo = hb_buffer_get_glyph_infos( buf, &gcount );
gpos = hb_buffer_get_glyph_positions( buf, &gcount );
*codepoint = ginfo[0].codepoint;
*y_offset = gpos[0].y_offset;
hb_buffer_destroy( buf );
#ifdef FT_DEBUG_LEVEL_TRACE
if ( gcount > 1 )
FT_TRACE1(( "af_get_char_index:"
" input character mapped to multiple glyphs\n" ));
#endif
}
else
{
*codepoint = FT_Get_Char_Index( metrics->globals->face, charcode );
*y_offset = 0;
}
return FT_Err_Ok;
}