0417527d5b
There is no need to validate the original charmap in `FT_Set_Charmap`.
It can be reset directly.
* src/autofit/afglobal.c (af_face_globals_compute_style_coverage):
Use direct assignment.
* src/autofit/af{latin,cjk,indic}.c (af_latin_metrics_init): Ditto.
511 lines
13 KiB
C
511 lines
13 KiB
C
/****************************************************************************
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*
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* afglobal.c
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*
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* Auto-fitter routines to compute global hinting values (body).
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*
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* Copyright (C) 2003-2022 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 "afglobal.h"
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#include "afranges.h"
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#include "afshaper.h"
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#include "afws-decl.h"
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#include <freetype/internal/ftdebug.h>
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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 afglobal
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#include "aferrors.h"
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#undef SCRIPT
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#define SCRIPT( s, S, d, h, H, ss ) \
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AF_DEFINE_SCRIPT_CLASS( \
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af_ ## s ## _script_class, \
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AF_SCRIPT_ ## S, \
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af_ ## s ## _uniranges, \
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af_ ## s ## _nonbase_uniranges, \
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AF_ ## H, \
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ss )
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#include "afscript.h"
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#undef STYLE
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#define STYLE( s, S, d, ws, sc, ss, c ) \
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AF_DEFINE_STYLE_CLASS( \
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af_ ## s ## _style_class, \
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AF_STYLE_ ## S, \
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ws, \
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sc, \
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ss, \
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c )
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#include "afstyles.h"
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#undef WRITING_SYSTEM
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#define WRITING_SYSTEM( ws, WS ) \
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&af_ ## ws ## _writing_system_class,
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FT_LOCAL_ARRAY_DEF( AF_WritingSystemClass )
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af_writing_system_classes[] =
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{
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#include "afws-iter.h"
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NULL /* do not remove */
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};
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#undef SCRIPT
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#define SCRIPT( s, S, d, h, H, ss ) \
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&af_ ## s ## _script_class,
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FT_LOCAL_ARRAY_DEF( AF_ScriptClass )
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af_script_classes[] =
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{
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#include "afscript.h"
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NULL /* do not remove */
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};
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#undef STYLE
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#define STYLE( s, S, d, ws, sc, ss, c ) \
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&af_ ## s ## _style_class,
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FT_LOCAL_ARRAY_DEF( AF_StyleClass )
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af_style_classes[] =
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{
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#include "afstyles.h"
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NULL /* do not remove */
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};
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#ifdef FT_DEBUG_LEVEL_TRACE
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#undef STYLE
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#define STYLE( s, S, d, ws, sc, ss, c ) #s,
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FT_LOCAL_ARRAY_DEF( char* )
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af_style_names[] =
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{
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#include "afstyles.h"
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};
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#endif /* FT_DEBUG_LEVEL_TRACE */
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/* Compute the style index of each glyph within a given face. */
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static FT_Error
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af_face_globals_compute_style_coverage( AF_FaceGlobals globals )
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{
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FT_Error error;
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FT_Face face = globals->face;
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FT_CharMap old_charmap = face->charmap;
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FT_UShort* gstyles = globals->glyph_styles;
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FT_UShort ss;
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FT_UShort dflt = 0xFFFFU; /* a non-valid value */
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FT_UInt i;
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/* the value AF_STYLE_UNASSIGNED means `uncovered glyph' */
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for ( i = 0; i < globals->glyph_count; i++ )
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gstyles[i] = AF_STYLE_UNASSIGNED;
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error = FT_Select_Charmap( face, FT_ENCODING_UNICODE );
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if ( error )
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{
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/*
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* Ignore this error; we simply use the fallback style.
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* XXX: Shouldn't we rather disable hinting?
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*/
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error = FT_Err_Ok;
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goto Exit;
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}
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/* scan each style in a Unicode charmap */
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for ( ss = 0; af_style_classes[ss]; ss++ )
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{
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AF_StyleClass style_class =
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af_style_classes[ss];
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AF_ScriptClass script_class =
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af_script_classes[style_class->script];
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AF_Script_UniRange range;
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if ( !script_class->script_uni_ranges )
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continue;
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/*
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* Scan all Unicode points in the range and set the corresponding
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* glyph style index.
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*/
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if ( style_class->coverage == AF_COVERAGE_DEFAULT )
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{
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if ( style_class->script == globals->module->default_script )
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dflt = ss;
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for ( range = script_class->script_uni_ranges;
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range->first != 0;
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range++ )
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{
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FT_ULong charcode = range->first;
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FT_UInt gindex;
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gindex = FT_Get_Char_Index( face, charcode );
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if ( gindex != 0 &&
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gindex < globals->glyph_count &&
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( gstyles[gindex] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED )
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gstyles[gindex] = ss;
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for (;;)
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{
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charcode = FT_Get_Next_Char( face, charcode, &gindex );
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if ( gindex == 0 || charcode > range->last )
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break;
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if ( gindex < globals->glyph_count &&
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( gstyles[gindex] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED )
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gstyles[gindex] = ss;
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}
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}
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/* do the same for the script's non-base characters */
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for ( range = script_class->script_uni_nonbase_ranges;
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range->first != 0;
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range++ )
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{
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FT_ULong charcode = range->first;
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FT_UInt gindex;
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gindex = FT_Get_Char_Index( face, charcode );
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if ( gindex != 0 &&
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gindex < globals->glyph_count &&
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( gstyles[gindex] & AF_STYLE_MASK ) == ss )
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gstyles[gindex] |= AF_NONBASE;
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for (;;)
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{
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charcode = FT_Get_Next_Char( face, charcode, &gindex );
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if ( gindex == 0 || charcode > range->last )
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break;
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if ( gindex < globals->glyph_count &&
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( gstyles[gindex] & AF_STYLE_MASK ) == ss )
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gstyles[gindex] |= AF_NONBASE;
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}
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}
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}
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else
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{
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/* get glyphs not directly addressable by cmap */
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af_shaper_get_coverage( globals, style_class, gstyles, 0 );
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}
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}
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/* handle the remaining default OpenType features ... */
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for ( ss = 0; af_style_classes[ss]; ss++ )
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{
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AF_StyleClass style_class = af_style_classes[ss];
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if ( style_class->coverage == AF_COVERAGE_DEFAULT )
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af_shaper_get_coverage( globals, style_class, gstyles, 0 );
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}
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/* ... and finally the default OpenType features of the default script */
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af_shaper_get_coverage( globals, af_style_classes[dflt], gstyles, 1 );
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/* mark ASCII digits */
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for ( i = 0x30; i <= 0x39; i++ )
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{
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FT_UInt gindex = FT_Get_Char_Index( face, i );
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if ( gindex != 0 && gindex < globals->glyph_count )
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gstyles[gindex] |= AF_DIGIT;
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}
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Exit:
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/*
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* By default, all uncovered glyphs are set to the fallback style.
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* XXX: Shouldn't we disable hinting or do something similar?
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*/
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if ( globals->module->fallback_style != AF_STYLE_UNASSIGNED )
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{
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FT_UInt nn;
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for ( nn = 0; nn < globals->glyph_count; nn++ )
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{
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if ( ( gstyles[nn] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED )
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{
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gstyles[nn] &= ~AF_STYLE_MASK;
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gstyles[nn] |= globals->module->fallback_style;
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}
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}
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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FT_TRACE4(( "\n" ));
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FT_TRACE4(( "style coverage\n" ));
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FT_TRACE4(( "==============\n" ));
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FT_TRACE4(( "\n" ));
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for ( ss = 0; af_style_classes[ss]; ss++ )
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{
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AF_StyleClass style_class = af_style_classes[ss];
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FT_UInt count = 0;
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FT_UInt idx;
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FT_TRACE4(( "%s:\n", af_style_names[style_class->style] ));
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for ( idx = 0; idx < globals->glyph_count; idx++ )
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{
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if ( ( gstyles[idx] & AF_STYLE_MASK ) == style_class->style )
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{
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if ( !( count % 10 ) )
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FT_TRACE4(( " " ));
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FT_TRACE4(( " %d", idx ));
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count++;
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if ( !( count % 10 ) )
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FT_TRACE4(( "\n" ));
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}
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}
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if ( !count )
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FT_TRACE4(( " (none)\n" ));
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if ( count % 10 )
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FT_TRACE4(( "\n" ));
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}
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#endif /* FT_DEBUG_LEVEL_TRACE */
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face->charmap = old_charmap;
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return error;
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}
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FT_LOCAL_DEF( FT_Error )
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af_face_globals_new( FT_Face face,
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AF_FaceGlobals *aglobals,
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AF_Module module )
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{
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FT_Error error;
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FT_Memory memory;
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AF_FaceGlobals globals = NULL;
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memory = face->memory;
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/* we allocate an AF_FaceGlobals structure together */
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/* with the glyph_styles array */
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if ( FT_QALLOC( globals,
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sizeof ( *globals ) +
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(FT_ULong)face->num_glyphs * sizeof ( FT_UShort ) ) )
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goto Exit;
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FT_ZERO( &globals->metrics );
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globals->face = face;
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globals->glyph_count = (FT_UInt)face->num_glyphs;
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/* right after the globals structure come the glyph styles */
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globals->glyph_styles = (FT_UShort*)( globals + 1 );
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globals->module = module;
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globals->stem_darkening_for_ppem = 0;
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globals->darken_x = 0;
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globals->darken_y = 0;
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globals->standard_vertical_width = 0;
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globals->standard_horizontal_width = 0;
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globals->scale_down_factor = 0;
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#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
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globals->hb_font = hb_ft_font_create( face, NULL );
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globals->hb_buf = hb_buffer_create();
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#endif
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error = af_face_globals_compute_style_coverage( globals );
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if ( error )
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{
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af_face_globals_free( globals );
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globals = NULL;
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}
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else
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globals->increase_x_height = AF_PROP_INCREASE_X_HEIGHT_MAX;
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Exit:
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*aglobals = globals;
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return error;
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}
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FT_LOCAL_DEF( void )
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af_face_globals_free( AF_FaceGlobals globals )
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{
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if ( globals )
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{
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FT_Memory memory = globals->face->memory;
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FT_UInt nn;
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for ( nn = 0; nn < AF_STYLE_MAX; nn++ )
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{
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if ( globals->metrics[nn] )
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{
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AF_StyleClass style_class =
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af_style_classes[nn];
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AF_WritingSystemClass writing_system_class =
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af_writing_system_classes[style_class->writing_system];
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if ( writing_system_class->style_metrics_done )
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writing_system_class->style_metrics_done( globals->metrics[nn] );
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FT_FREE( globals->metrics[nn] );
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}
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}
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#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
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hb_font_destroy( globals->hb_font );
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hb_buffer_destroy( globals->hb_buf );
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#endif
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/* no need to free `globals->glyph_styles'; */
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/* it is part of the `globals' array */
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FT_FREE( globals );
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}
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}
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FT_LOCAL_DEF( FT_Error )
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af_face_globals_get_metrics( AF_FaceGlobals globals,
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FT_UInt gindex,
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FT_UInt options,
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AF_StyleMetrics *ametrics )
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{
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AF_StyleMetrics metrics = NULL;
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AF_Style style = (AF_Style)options;
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AF_WritingSystemClass writing_system_class;
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AF_StyleClass style_class;
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FT_Error error = FT_Err_Ok;
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if ( gindex >= globals->glyph_count )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* if we have a forced style (via `options'), use it, */
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/* otherwise look into `glyph_styles' array */
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if ( style == AF_STYLE_NONE_DFLT || style + 1 >= AF_STYLE_MAX )
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style = (AF_Style)( globals->glyph_styles[gindex] &
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AF_STYLE_UNASSIGNED );
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Again:
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style_class = af_style_classes[style];
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writing_system_class = af_writing_system_classes
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[style_class->writing_system];
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metrics = globals->metrics[style];
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if ( !metrics )
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{
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/* create the global metrics object if necessary */
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FT_Memory memory = globals->face->memory;
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if ( FT_ALLOC( metrics, writing_system_class->style_metrics_size ) )
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goto Exit;
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metrics->style_class = style_class;
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metrics->globals = globals;
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if ( writing_system_class->style_metrics_init )
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{
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error = writing_system_class->style_metrics_init( metrics,
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globals->face );
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if ( error )
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{
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if ( writing_system_class->style_metrics_done )
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writing_system_class->style_metrics_done( metrics );
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FT_FREE( metrics );
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/* internal error code -1 indicates */
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/* that no blue zones have been found */
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if ( error == -1 )
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{
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style = (AF_Style)( globals->glyph_styles[gindex] &
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AF_STYLE_UNASSIGNED );
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/* IMPORTANT: Clear the error code, see
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* https://gitlab.freedesktop.org/freetype/freetype/-/issues/1063
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*/
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error = FT_Err_Ok;
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goto Again;
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}
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goto Exit;
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}
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}
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globals->metrics[style] = metrics;
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}
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Exit:
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*ametrics = metrics;
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return error;
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}
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FT_LOCAL_DEF( FT_Bool )
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af_face_globals_is_digit( AF_FaceGlobals globals,
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FT_UInt gindex )
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{
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if ( gindex < globals->glyph_count )
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return FT_BOOL( globals->glyph_styles[gindex] & AF_DIGIT );
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return FT_BOOL( 0 );
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}
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/* END */
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