diff options
Diffstat (limited to 'modules/freetype2/src/autofit/afglobal.c')
| -rw-r--r-- | modules/freetype2/src/autofit/afglobal.c | 510 |
1 files changed, 510 insertions, 0 deletions
diff --git a/modules/freetype2/src/autofit/afglobal.c b/modules/freetype2/src/autofit/afglobal.c new file mode 100644 index 0000000000..ede27eb166 --- /dev/null +++ b/modules/freetype2/src/autofit/afglobal.c @@ -0,0 +1,510 @@ +/**************************************************************************** + * + * afglobal.c + * + * Auto-fitter routines to compute global hinting values (body). + * + * Copyright (C) 2003-2023 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 "afws-decl.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 + + +#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 "afws-iter.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_UShort ss; + FT_UShort dflt = 0xFFFFU; /* a non-valid value */ + FT_UInt i; + + + /* the value AF_STYLE_UNASSIGNED means `uncovered glyph' */ + for ( i = 0; i < 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 ( 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 < globals->glyph_count && + ( gstyles[gindex] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED ) + gstyles[gindex] = ss; + + for (;;) + { + charcode = FT_Get_Next_Char( face, charcode, &gindex ); + + if ( gindex == 0 || charcode > range->last ) + break; + + if ( gindex < globals->glyph_count && + ( gstyles[gindex] & AF_STYLE_MASK ) == AF_STYLE_UNASSIGNED ) + gstyles[gindex] = 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 < globals->glyph_count && + ( gstyles[gindex] & AF_STYLE_MASK ) == ss ) + gstyles[gindex] |= AF_NONBASE; + + for (;;) + { + charcode = FT_Get_Next_Char( face, charcode, &gindex ); + + if ( gindex == 0 || charcode > range->last ) + break; + + if ( gindex < globals->glyph_count && + ( gstyles[gindex] & AF_STYLE_MASK ) == 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 < 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_UInt 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_UInt 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(( " %d", 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 */ + + face->charmap = 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_QALLOC( globals, + sizeof ( *globals ) + + (FT_ULong)face->num_glyphs * sizeof ( FT_UShort ) ) ) + goto Exit; + + FT_ZERO( &globals->metrics ); + + globals->face = face; + globals->glyph_count = (FT_UInt)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 >= 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 = FT_Err_Ok; + 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 < globals->glyph_count ) + return FT_BOOL( globals->glyph_styles[gindex] & AF_DIGIT ); + + return FT_BOOL( 0 ); + } + + +/* END */ |