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freetype/src/autofit/hbshim.c

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Introduce `coverages'. Coverages are the interface to the HarfBuzz library to access OpenType features for handling glyphs not addressable by the cmap. Right now, compilation of HarfBuzz is only added to the development build. A solution for standard build mode will be delayed until HarfBuzz gets split into two libraries to avoid mutual dependencies between FreeType and HarfBuzz. Note that this is only a first step in handling coverages, basically providing the framework only. Code for handling selected OpenType features (this is, actually using the data in `afcover.h') will follow. * devel/ftoption.h, include/config/ftoption.h (FT_CONFIG_OPTION_USE_HARFBUZZ): New macro. * src/autofit/hbshim.c, src/autofit/hbshim.h, src/autofit/afcover.h: New files. * src/autofit/afscript.h: Add HarfBuzz script name tags. * src/autofit/afstyles.h: Add default coverage enumeration values. * src/autofit/aftypes.h: Update use of `SCRIPT' and `STYLE' macros. (AF_Coverage): New enumeration (generated by `afcover.h'). (AF_StyleClassRec): New member `coverage'. (AF_DEFINE_STYLE_CLASS): Updated. * include/internal/fttrace.h: Add `afharfbuzz' for tracing coverage data. * src/autofit/afglobal.h: Update use of `SCRIPT' and `STYLE' macros. (AF_SCRIPT_FALLBACK): Renamed to ... (AF_STYLE_FALLBACK): ... this. * src/autofit/afglobal.c: Include `hbshim.c'. Update use of `SCRIPT' and `STYLE' macros. (af_face_globals_compute_style_coverage) [FT_CONFIG_OPTION_USE_HARFBUZZ]: Call `af_get_coverage'. Update. * src/autofit/afmodule.h (AF_ModuleRec): s/fallback_script/fallback_style/. * src/autofit/afmodule.c (af_property_set): Adapt handling of `fallback-script' property to set a fallback style. (af_property_get, af_autofitter_init): Updated. * src/autofit/afpic.c: Update use of `SCRIPT' and `STYLE' macros. * src/autofit/afranges.h: Update use of `SCRIPT' macro. * src/autofit/autofit.c [FT_CONFIG_OPTION_USE_HARFBUZZ]: Include `hbshim.c'. * src/autofit/rules.mk (AUTOF_DRV_SRC): Add `hbshim.c'. (AUTOF_DRV_H): Add `afcover.h'. * builds/freetype.mk (INCLUDE_FLAGS) [DEVEL_DIR]: Use pkg-config for all libraries needed by FreeType.
2013-12-21 21:31:38 +01:00
/***************************************************************************/
/* */
/* hbshim.c */
/* */
/* HarfBuzz interface for accessing OpenType features (body). */
/* */
/* Copyright 2013 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_FREETYPE_H
#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
#include <hb.h>
#include <hb-ot.h>
#include <hb-ft.h>
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_afharfbuzz
/*
* We use `sets' (in the HarfBuzz sense, which comes quite near to the
* usual mathematical meaning) to manage both lookups and glyph indices.
*
* 1. For each coverage, collect lookup IDs in a set. Note that an
* auto-hinter `coverage' is represented by one or more `feature's, and
* a feature consists of an arbitrary number of (font specific)
* `lookup's that actually do the mapping job. Please check the
* OpenType specification for more details on features and lookups.
*
* 2. Create glyph ID sets from the corresponding lookup sets.
*
* 3. The glyph set corresponding to AF_COVERAGE_DEFAULT is computed
* with all lookups specific to the OpenType script activated. It
* relies on the order of AF_DEFINE_STYLE_CLASS entries so that
* special coverages (like `oldstyle figures') don't get overwritten.
*
*/
/* load coverage tags */
#undef COVERAGE_1
#define COVERAGE_1( name, NAME, description, \
tag_a1, tag_a2, tag_a3, tag_a4 ) \
static const hb_tag_t name ## _coverage[] = \
{ \
HB_TAG( tag_a1, tag_a2, tag_a3, tag_a4 ), \
HB_TAG_NONE \
};
#undef COVERAGE_2
#define COVERAGE_2( name, NAME, description, \
tag_a1, tag_a2, tag_a3, tag_a4, \
tag_b1, tag_b2, tag_b3, tag_b4 ) \
static const hb_tag_t name ## _coverage[] = \
{ \
HB_TAG( tag_a1, tag_a2, tag_a3, tag_a4 ), \
HB_TAG( tag_b1, tag_b2, tag_b3, tag_b4 ), \
HB_TAG_NONE \
};
#undef COVERAGE_3
#define COVERAGE_3( name, NAME, description, \
tag_a1, tag_a2, tag_a3, tag_a4, \
tag_b1, tag_b2, tag_b3, tag_b4, \
tag_c1, tag_c2, tag_c3, tag_c4 ) \
static const hb_tag_t name ## _coverage[] = \
{ \
HB_TAG( tag_a1, tag_a2, tag_a3, tag_a4 ), \
HB_TAG( tag_b1, tag_b2, tag_b3, tag_b4 ), \
HB_TAG( tag_c1, tag_c2, tag_c3, tag_c4 ), \
HB_TAG_NONE \
};
#include "afcover.h"
/* define mapping between coverage tags and AF_Coverage */
#undef COVERAGE_1
#define COVERAGE_1( name, NAME, description, \
tag_a1, tag_a2, tag_a3, tag_a4 ) \
name ## _coverage,
#undef COVERAGE_2
#define COVERAGE_2( name, NAME, description, \
tag_a1, tag_a2, tag_a3, tag_a4, \
tag_b1, tag_b2, tag_b3, tag_b4 ) \
name ## _coverage,
#undef COVERAGE_3
#define COVERAGE_3( name, NAME, description, \
tag_a1, tag_a2, tag_a3, tag_a4, \
tag_b1, tag_b2, tag_b3, tag_b4, \
tag_c1, tag_c2, tag_c3, tag_c4 ) \
name ## _coverage,
static const hb_tag_t* coverages[] =
{
#include "afcover.h"
NULL /* AF_COVERAGE_DEFAULT */
};
/* load HarfBuzz script tags */
#undef SCRIPT
#define SCRIPT( s, S, d, h, dc ) h,
static const hb_tag_t scripts[] =
{
#include "afscript.h"
};
FT_Error
af_get_coverage( FT_Face ft_face,
AF_StyleClass style_class,
FT_Byte* gstyles )
{
hb_face_t* face;
hb_set_t* lookups; /* lookups for a given script */
hb_set_t* glyphs; /* glyphs covered by lookups */
hb_tag_t script;
const hb_tag_t* coverage_tags;
hb_tag_t script_tags[] = { HB_TAG_NONE,
HB_TAG_NONE,
HB_TAG_NONE };
hb_codepoint_t idx;
#ifdef FT_DEBUG_LEVEL_TRACE
int count;
#endif
if ( !ft_face || !style_class || !gstyles )
return FT_THROW( Invalid_Argument );
face = hb_ft_face_create( ft_face, NULL );
lookups = hb_set_create();
glyphs = hb_set_create();
coverage_tags = coverages[style_class->coverage];
script = scripts[style_class->script];
/* Convert a HarfBuzz script tag into the corresponding OpenType */
/* tag or tags -- some Indic scripts like Devanagari have an old */
/* and a new set of features. */
hb_ot_tags_from_script( script,
&script_tags[0],
&script_tags[1] );
/* `hb_ot_tags_from_script' usually returns HB_OT_TAG_DEFAULT_SCRIPT */
/* as the second tag. We change that to HB_TAG_NONE since the */
/* default script gets handled later on. */
if ( script_tags[1] == HB_OT_TAG_DEFAULT_SCRIPT )
script_tags[1] = HB_TAG_NONE;
hb_ot_layout_collect_lookups( face,
HB_OT_TAG_GSUB,
script_tags,
NULL,
coverage_tags,
lookups );
FT_TRACE4(( "lookups (style `%s'):\n"
" ",
af_style_names[style_class->style] ));
#ifdef FT_DEBUG_LEVEL_TRACE
count = 0;
#endif
for ( idx = -1; hb_set_next( lookups, &idx ); )
{
#ifdef FT_DEBUG_LEVEL_TRACE
FT_TRACE4(( " %d", idx ));
count++;
#endif
hb_ot_layout_lookup_collect_glyphs( face,
HB_OT_TAG_GSUB,
idx,
NULL,
NULL,
NULL,
glyphs );
}
#ifdef FT_DEBUG_LEVEL_TRACE
if ( !count )
FT_TRACE4(( " (none)" ));
FT_TRACE4(( "\n\n" ));
FT_TRACE4(( " glyphs (`*' means already assigned)" ));
count = 0;
#endif
for ( idx = -1; hb_set_next( glyphs, &idx ); )
{
#ifdef FT_DEBUG_LEVEL_TRACE
if ( !( count % 10 ) )
FT_TRACE4(( "\n"
" " ));
FT_TRACE4(( " %d", idx ));
count++;
#endif
if ( gstyles[idx] == AF_STYLE_UNASSIGNED )
gstyles[idx] = (FT_Byte)style_class->style;
#ifdef FT_DEBUG_LEVEL_TRACE
else
FT_TRACE4(( "*" ));
#endif
}
#ifdef FT_DEBUG_LEVEL_TRACE
if ( !count )
FT_TRACE4(( "\n"
" (none)" ));
FT_TRACE4(( "\n\n" ));
#endif
hb_set_destroy( lookups );
hb_set_destroy( glyphs );
hb_face_destroy( face );
return FT_Err_Ok;
}
#if 0
/* to be always excluded */
COVERAGE(nalt, 'n', 'a', 'l', 't'); /* Alternate Annotation Forms (?) */
COVERAGE(ornm, 'o', 'r', 'n', 'm'); /* Ornaments (?) */
/* COVERAGE(ruby, 'r', 'u', 'b', 'y') */ /* (only for Japanese) */
#endif
#endif /* FT_CONFIG_OPTION_USE_HARFBUZZ */
/* END */
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