285 lines
8.3 KiB
C
285 lines
8.3 KiB
C
/***************************************************************************/
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/* */
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/* hbshim.c */
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/* */
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/* HarfBuzz interface for accessing OpenType features (body). */
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/* */
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/* Copyright 2013 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include "hbshim.h"
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#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_afharfbuzz
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/*
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* We use `sets' (in the HarfBuzz sense, which comes quite near to the
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* usual mathematical meaning) to manage both lookups and glyph indices.
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*
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* 1. For each coverage, collect lookup IDs in a set. Note that an
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* auto-hinter `coverage' is represented by one `feature', and a
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* feature consists of an arbitrary number of (font specific) `lookup's
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* that actually do the mapping job. Please check the OpenType
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* specification for more details on features and lookups.
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*
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* 2. Create glyph ID sets from the corresponding lookup sets.
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*
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* 3. The glyph set corresponding to AF_COVERAGE_DEFAULT is computed
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* with all lookups specific to the OpenType script activated. It
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* relies on the order of AF_DEFINE_STYLE_CLASS entries so that
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* special coverages (like `oldstyle figures') don't get overwritten.
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*
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*/
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/* load coverage tags */
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#undef COVERAGE
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#define COVERAGE( name, NAME, description, \
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tag1, tag2, tag3, tag4 ) \
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static const hb_tag_t name ## _coverage[] = \
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{ \
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HB_TAG( tag1, tag2, tag3, tag4 ), \
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HB_TAG_NONE \
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};
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#include "afcover.h"
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/* define mapping between coverage tags and AF_Coverage */
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#undef COVERAGE
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#define COVERAGE( name, NAME, description, \
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tag1, tag2, tag3, tag4 ) \
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name ## _coverage,
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static const hb_tag_t* coverages[] =
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{
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#include "afcover.h"
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NULL /* AF_COVERAGE_DEFAULT */
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};
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/* load HarfBuzz script tags */
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#undef SCRIPT
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#define SCRIPT( s, S, d, h, dc ) h,
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static const hb_tag_t scripts[] =
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{
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#include "afscript.h"
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};
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FT_Error
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af_get_coverage( AF_FaceGlobals globals,
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AF_StyleClass style_class,
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FT_Byte* gstyles )
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{
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hb_face_t* face;
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hb_set_t* lookups; /* lookups for a given script */
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hb_set_t* glyphs; /* glyphs covered by lookups */
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hb_tag_t script;
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const hb_tag_t* coverage_tags;
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hb_tag_t script_tags[] = { HB_TAG_NONE,
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HB_TAG_NONE,
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HB_TAG_NONE,
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HB_TAG_NONE };
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hb_codepoint_t idx;
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#ifdef FT_DEBUG_LEVEL_TRACE
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int count;
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#endif
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if ( !globals || !style_class || !gstyles )
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return FT_THROW( Invalid_Argument );
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face = hb_font_get_face( globals->hb_font );
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lookups = hb_set_create();
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glyphs = hb_set_create();
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coverage_tags = coverages[style_class->coverage];
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script = scripts[style_class->script];
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/* Convert a HarfBuzz script tag into the corresponding OpenType */
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/* tag or tags -- some Indic scripts like Devanagari have an old */
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/* and a new set of features. */
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hb_ot_tags_from_script( script,
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&script_tags[0],
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&script_tags[1] );
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/* `hb_ot_tags_from_script' usually returns HB_OT_TAG_DEFAULT_SCRIPT */
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/* as the second tag. We change that to HB_TAG_NONE except for the */
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/* default script. */
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if ( style_class->script == globals->module->default_script &&
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style_class->coverage == AF_COVERAGE_DEFAULT )
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{
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if ( script_tags[0] == HB_TAG_NONE )
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script_tags[0] = HB_OT_TAG_DEFAULT_SCRIPT;
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else
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{
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if ( script_tags[1] == HB_TAG_NONE )
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script_tags[1] = HB_OT_TAG_DEFAULT_SCRIPT;
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else if ( script_tags[1] != HB_OT_TAG_DEFAULT_SCRIPT )
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script_tags[2] = HB_OT_TAG_DEFAULT_SCRIPT;
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}
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}
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else
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{
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if ( script_tags[1] == HB_OT_TAG_DEFAULT_SCRIPT )
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script_tags[1] = HB_TAG_NONE;
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}
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hb_ot_layout_collect_lookups( face,
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HB_OT_TAG_GSUB,
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script_tags,
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NULL,
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coverage_tags,
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lookups );
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FT_TRACE4(( "lookups (style `%s'):\n"
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" ",
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af_style_names[style_class->style] ));
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#ifdef FT_DEBUG_LEVEL_TRACE
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count = 0;
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#endif
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for ( idx = -1; hb_set_next( lookups, &idx ); )
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{
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#ifdef FT_DEBUG_LEVEL_TRACE
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FT_TRACE4(( " %d", idx ));
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count++;
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#endif
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hb_ot_layout_lookup_collect_glyphs( face,
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HB_OT_TAG_GSUB,
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idx,
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NULL,
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NULL,
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NULL,
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glyphs );
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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if ( !count )
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FT_TRACE4(( " (none)" ));
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FT_TRACE4(( "\n\n" ));
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FT_TRACE4(( " glyphs (`*' means already assigned)" ));
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count = 0;
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#endif
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for ( idx = -1; hb_set_next( glyphs, &idx ); )
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{
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#ifdef FT_DEBUG_LEVEL_TRACE
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if ( !( count % 10 ) )
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FT_TRACE4(( "\n"
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" " ));
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FT_TRACE4(( " %d", idx ));
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count++;
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#endif
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if ( gstyles[idx] == AF_STYLE_UNASSIGNED )
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gstyles[idx] = (FT_Byte)style_class->style;
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#ifdef FT_DEBUG_LEVEL_TRACE
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else
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FT_TRACE4(( "*" ));
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#endif
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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if ( !count )
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FT_TRACE4(( "\n"
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" (none)" ));
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FT_TRACE4(( "\n\n" ));
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#endif
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hb_set_destroy( lookups );
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hb_set_destroy( glyphs );
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return FT_Err_Ok;
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}
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FT_UInt
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af_get_char_index( AF_StyleMetrics metrics,
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FT_ULong charcode )
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{
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FT_Face face;
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if ( !metrics )
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return FT_THROW( Invalid_Argument );
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face = metrics->globals->face;
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return FT_Get_Char_Index( face, charcode );
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}
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#else /* !FT_CONFIG_OPTION_USE_HARDBUZZ */
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FT_Error
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af_get_coverage( AF_FaceGlobals globals,
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AF_StyleClass style_class,
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FT_Byte* gstyles )
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{
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FT_UNUSED( globals );
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FT_UNUSED( style_class );
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FT_UNUSED( gstyles );
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return FT_Err_Ok;
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}
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FT_UInt
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af_get_char_index( AF_StyleMetrics metrics,
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FT_ULong charcode )
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{
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FT_Face face;
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if ( !metrics )
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return FT_THROW( Invalid_Argument );
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face = metrics->globals->face;
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return FT_Get_Char_Index( face, charcode );
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}
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#endif /* !FT_CONFIG_OPTION_USE_HARFBUZZ */
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/* END */
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