| /**************************************************************************** |
| * |
| * afglobal.c |
| * |
| * Auto-fitter routines to compute global hinting values (body). |
| * |
| * Copyright (C) 2003-2021 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 "afglobal.h" |
| #include "afranges.h" |
| #include "afshaper.h" |
| #include <freetype/internal/ftdebug.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 afglobal |
| |
| |
| /* get writing system specific header files */ |
| #undef WRITING_SYSTEM |
| #define WRITING_SYSTEM( ws, WS ) /* empty */ |
| #include "afwrtsys.h" |
| |
| #include "aferrors.h" |
| |
| |
| #undef SCRIPT |
| #define SCRIPT( s, S, d, h, H, ss ) \ |
| AF_DEFINE_SCRIPT_CLASS( \ |
| af_ ## s ## _script_class, \ |
| AF_SCRIPT_ ## S, \ |
| af_ ## s ## _uniranges, \ |
| af_ ## s ## _nonbase_uniranges, \ |
| AF_ ## H, \ |
| ss ) |
| |
| #include "afscript.h" |
| |
| |
| #undef STYLE |
| #define STYLE( s, S, d, ws, sc, ss, c ) \ |
| AF_DEFINE_STYLE_CLASS( \ |
| af_ ## s ## _style_class, \ |
| AF_STYLE_ ## S, \ |
| ws, \ |
| sc, \ |
| ss, \ |
| c ) |
| |
| #include "afstyles.h" |
| |
| |
| #undef WRITING_SYSTEM |
| #define WRITING_SYSTEM( ws, WS ) \ |
| &af_ ## ws ## _writing_system_class, |
| |
| FT_LOCAL_ARRAY_DEF( AF_WritingSystemClass ) |
| af_writing_system_classes[] = |
| { |
| |
| #include "afwrtsys.h" |
| |
| NULL /* do not remove */ |
| }; |
| |
| |
| #undef SCRIPT |
| #define SCRIPT( s, S, d, h, H, ss ) \ |
| &af_ ## s ## _script_class, |
| |
| FT_LOCAL_ARRAY_DEF( AF_ScriptClass ) |
| af_script_classes[] = |
| { |
| |
| #include "afscript.h" |
| |
| NULL /* do not remove */ |
| }; |
| |
| |
| #undef STYLE |
| #define STYLE( s, S, d, ws, sc, ss, c ) \ |
| &af_ ## s ## _style_class, |
| |
| FT_LOCAL_ARRAY_DEF( AF_StyleClass ) |
| af_style_classes[] = |
| { |
| |
| #include "afstyles.h" |
| |
| NULL /* do not remove */ |
| }; |
| |
| |
| #ifdef FT_DEBUG_LEVEL_TRACE |
| |
| #undef STYLE |
| #define STYLE( s, S, d, ws, sc, ss, c ) #s, |
| |
| FT_LOCAL_ARRAY_DEF( char* ) |
| af_style_names[] = |
| { |
| |
| #include "afstyles.h" |
| |
| }; |
| |
| #endif /* FT_DEBUG_LEVEL_TRACE */ |
| |
| |
| /* Compute the style index of each glyph within a given face. */ |
| |
| static FT_Error |
| af_face_globals_compute_style_coverage( AF_FaceGlobals globals ) |
| { |
| FT_Error error; |
| FT_Face face = globals->face; |
| FT_CharMap old_charmap = face->charmap; |
| FT_UShort* gstyles = globals->glyph_styles; |
| FT_UInt ss; |
| FT_UInt i; |
| FT_UInt dflt = ~0U; /* a non-valid value */ |
| |
| |
| /* the value AF_STYLE_UNASSIGNED means `uncovered glyph' */ |
| for ( i = 0; i < (FT_UInt)globals->glyph_count; i++ ) |
| gstyles[i] = AF_STYLE_UNASSIGNED; |
| |
| error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); |
| if ( error ) |
| { |
| /* |
| * Ignore this error; we simply use the fallback style. |
| * XXX: Shouldn't we rather disable hinting? |
| */ |
| error = FT_Err_Ok; |
| goto Exit; |
| } |
| |
| /* scan each style in a Unicode charmap */ |
| for ( ss = 0; af_style_classes[ss]; ss++ ) |
| { |
| AF_StyleClass style_class = |
| af_style_classes[ss]; |
| AF_ScriptClass script_class = |
| af_script_classes[style_class->script]; |
| AF_Script_UniRange range; |
| |
| |
| if ( !script_class->script_uni_ranges ) |
| continue; |
| |
| /* |
| * Scan all Unicode points in the range and set the corresponding |
| * glyph style index. |
| */ |
| if ( style_class->coverage == AF_COVERAGE_DEFAULT ) |
| { |
| if ( (FT_UInt)style_class->script == |
| globals->module->default_script ) |
| dflt = ss; |
| |
| for ( range = script_class->script_uni_ranges; |
| range->first != 0; |
| range++ ) |
| { |
| FT_ULong charcode = range->first; |
| FT_UInt gindex; |
| |
| |
| gindex = FT_Get_Char_Index( face, charcode ); |
| |
| if ( gindex != 0 && |
| gindex < (FT_ULong)globals->glyph_count && |
| ( gstyles[gindex] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED ) |
| gstyles[gindex] = (FT_UShort)ss; |
| |
| for (;;) |
| { |
| charcode = FT_Get_Next_Char( face, charcode, &gindex ); |
| |
| if ( gindex == 0 || charcode > range->last ) |
| break; |
| |
| if ( gindex < (FT_ULong)globals->glyph_count && |
| ( gstyles[gindex] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED ) |
| gstyles[gindex] = (FT_UShort)ss; |
| } |
| } |
| |
| /* do the same for the script's non-base characters */ |
| for ( range = script_class->script_uni_nonbase_ranges; |
| range->first != 0; |
| range++ ) |
| { |
| FT_ULong charcode = range->first; |
| FT_UInt gindex; |
| |
| |
| gindex = FT_Get_Char_Index( face, charcode ); |
| |
| if ( gindex != 0 && |
| gindex < (FT_ULong)globals->glyph_count && |
| ( gstyles[gindex] & AF_STYLE_MASK ) == (FT_UShort)ss ) |
| gstyles[gindex] |= AF_NONBASE; |
| |
| for (;;) |
| { |
| charcode = FT_Get_Next_Char( face, charcode, &gindex ); |
| |
| if ( gindex == 0 || charcode > range->last ) |
| break; |
| |
| if ( gindex < (FT_ULong)globals->glyph_count && |
| ( gstyles[gindex] & AF_STYLE_MASK ) == (FT_UShort)ss ) |
| gstyles[gindex] |= AF_NONBASE; |
| } |
| } |
| } |
| else |
| { |
| /* get glyphs not directly addressable by cmap */ |
| af_shaper_get_coverage( globals, style_class, gstyles, 0 ); |
| } |
| } |
| |
| /* handle the remaining default OpenType features ... */ |
| for ( ss = 0; af_style_classes[ss]; ss++ ) |
| { |
| AF_StyleClass style_class = af_style_classes[ss]; |
| |
| |
| if ( style_class->coverage == AF_COVERAGE_DEFAULT ) |
| af_shaper_get_coverage( globals, style_class, gstyles, 0 ); |
| } |
| |
| /* ... and finally the default OpenType features of the default script */ |
| af_shaper_get_coverage( globals, af_style_classes[dflt], gstyles, 1 ); |
| |
| /* mark ASCII digits */ |
| for ( i = 0x30; i <= 0x39; i++ ) |
| { |
| FT_UInt gindex = FT_Get_Char_Index( face, i ); |
| |
| |
| if ( gindex != 0 && gindex < (FT_ULong)globals->glyph_count ) |
| gstyles[gindex] |= AF_DIGIT; |
| } |
| |
| Exit: |
| /* |
| * By default, all uncovered glyphs are set to the fallback style. |
| * XXX: Shouldn't we disable hinting or do something similar? |
| */ |
| if ( globals->module->fallback_style != AF_STYLE_UNASSIGNED ) |
| { |
| FT_Long nn; |
| |
| |
| for ( nn = 0; nn < globals->glyph_count; nn++ ) |
| { |
| if ( ( gstyles[nn] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED ) |
| { |
| gstyles[nn] &= ~AF_STYLE_MASK; |
| gstyles[nn] |= globals->module->fallback_style; |
| } |
| } |
| } |
| |
| #ifdef FT_DEBUG_LEVEL_TRACE |
| |
| FT_TRACE4(( "\n" )); |
| FT_TRACE4(( "style coverage\n" )); |
| FT_TRACE4(( "==============\n" )); |
| FT_TRACE4(( "\n" )); |
| |
| for ( ss = 0; af_style_classes[ss]; ss++ ) |
| { |
| AF_StyleClass style_class = af_style_classes[ss]; |
| FT_UInt count = 0; |
| FT_Long idx; |
| |
| |
| FT_TRACE4(( "%s:\n", af_style_names[style_class->style] )); |
| |
| for ( idx = 0; idx < globals->glyph_count; idx++ ) |
| { |
| if ( ( gstyles[idx] & AF_STYLE_MASK ) == style_class->style ) |
| { |
| if ( !( count % 10 ) ) |
| FT_TRACE4(( " " )); |
| |
| FT_TRACE4(( " %ld", idx )); |
| count++; |
| |
| if ( !( count % 10 ) ) |
| FT_TRACE4(( "\n" )); |
| } |
| } |
| |
| if ( !count ) |
| FT_TRACE4(( " (none)\n" )); |
| if ( count % 10 ) |
| FT_TRACE4(( "\n" )); |
| } |
| |
| #endif /* FT_DEBUG_LEVEL_TRACE */ |
| |
| FT_Set_Charmap( face, old_charmap ); |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| af_face_globals_new( FT_Face face, |
| AF_FaceGlobals *aglobals, |
| AF_Module module ) |
| { |
| FT_Error error; |
| FT_Memory memory; |
| AF_FaceGlobals globals = NULL; |
| |
| |
| memory = face->memory; |
| |
| /* we allocate an AF_FaceGlobals structure together */ |
| /* with the glyph_styles array */ |
| if ( FT_ALLOC( globals, |
| sizeof ( *globals ) + |
| (FT_ULong)face->num_glyphs * sizeof ( FT_UShort ) ) ) |
| goto Exit; |
| |
| globals->face = face; |
| globals->glyph_count = face->num_glyphs; |
| /* right after the globals structure come the glyph styles */ |
| globals->glyph_styles = (FT_UShort*)( globals + 1 ); |
| globals->module = module; |
| globals->stem_darkening_for_ppem = 0; |
| globals->darken_x = 0; |
| globals->darken_y = 0; |
| globals->standard_vertical_width = 0; |
| globals->standard_horizontal_width = 0; |
| globals->scale_down_factor = 0; |
| |
| #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ |
| globals->hb_font = hb_ft_font_create( face, NULL ); |
| globals->hb_buf = hb_buffer_create(); |
| #endif |
| |
| error = af_face_globals_compute_style_coverage( globals ); |
| if ( error ) |
| { |
| af_face_globals_free( globals ); |
| globals = NULL; |
| } |
| else |
| globals->increase_x_height = AF_PROP_INCREASE_X_HEIGHT_MAX; |
| |
| Exit: |
| *aglobals = globals; |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| af_face_globals_free( AF_FaceGlobals globals ) |
| { |
| if ( globals ) |
| { |
| FT_Memory memory = globals->face->memory; |
| FT_UInt nn; |
| |
| |
| for ( nn = 0; nn < AF_STYLE_MAX; nn++ ) |
| { |
| if ( globals->metrics[nn] ) |
| { |
| AF_StyleClass style_class = |
| af_style_classes[nn]; |
| AF_WritingSystemClass writing_system_class = |
| af_writing_system_classes[style_class->writing_system]; |
| |
| |
| if ( writing_system_class->style_metrics_done ) |
| writing_system_class->style_metrics_done( globals->metrics[nn] ); |
| |
| FT_FREE( globals->metrics[nn] ); |
| } |
| } |
| |
| #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ |
| hb_font_destroy( globals->hb_font ); |
| hb_buffer_destroy( globals->hb_buf ); |
| #endif |
| |
| /* no need to free `globals->glyph_styles'; */ |
| /* it is part of the `globals' array */ |
| FT_FREE( globals ); |
| } |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| af_face_globals_get_metrics( AF_FaceGlobals globals, |
| FT_UInt gindex, |
| FT_UInt options, |
| AF_StyleMetrics *ametrics ) |
| { |
| AF_StyleMetrics metrics = NULL; |
| |
| AF_Style style = (AF_Style)options; |
| AF_WritingSystemClass writing_system_class; |
| AF_StyleClass style_class; |
| |
| FT_Error error = FT_Err_Ok; |
| |
| |
| if ( gindex >= (FT_ULong)globals->glyph_count ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| /* if we have a forced style (via `options'), use it, */ |
| /* otherwise look into `glyph_styles' array */ |
| if ( style == AF_STYLE_NONE_DFLT || style + 1 >= AF_STYLE_MAX ) |
| style = (AF_Style)( globals->glyph_styles[gindex] & |
| AF_STYLE_UNASSIGNED ); |
| |
| Again: |
| style_class = af_style_classes[style]; |
| writing_system_class = af_writing_system_classes |
| [style_class->writing_system]; |
| |
| metrics = globals->metrics[style]; |
| if ( !metrics ) |
| { |
| /* create the global metrics object if necessary */ |
| FT_Memory memory = globals->face->memory; |
| |
| |
| if ( FT_ALLOC( metrics, writing_system_class->style_metrics_size ) ) |
| goto Exit; |
| |
| metrics->style_class = style_class; |
| metrics->globals = globals; |
| |
| if ( writing_system_class->style_metrics_init ) |
| { |
| error = writing_system_class->style_metrics_init( metrics, |
| globals->face ); |
| if ( error ) |
| { |
| if ( writing_system_class->style_metrics_done ) |
| writing_system_class->style_metrics_done( metrics ); |
| |
| FT_FREE( metrics ); |
| |
| /* internal error code -1 indicates */ |
| /* that no blue zones have been found */ |
| if ( error == -1 ) |
| { |
| style = (AF_Style)( globals->glyph_styles[gindex] & |
| AF_STYLE_UNASSIGNED ); |
| /* IMPORTANT: Clear the error code, see |
| * https://gitlab.freedesktop.org/freetype/freetype/-/issues/1063 |
| */ |
| error = 0; |
| goto Again; |
| } |
| |
| goto Exit; |
| } |
| } |
| |
| globals->metrics[style] = metrics; |
| } |
| |
| Exit: |
| *ametrics = metrics; |
| |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Bool ) |
| af_face_globals_is_digit( AF_FaceGlobals globals, |
| FT_UInt gindex ) |
| { |
| if ( gindex < (FT_ULong)globals->glyph_count ) |
| return FT_BOOL( globals->glyph_styles[gindex] & AF_DIGIT ); |
| |
| return FT_BOOL( 0 ); |
| } |
| |
| |
| /* END */ |
