Edit
kc3-lang/freetype/src/type1/t1gload.c
Werner Lemberg
- src/type1/t1gload.c
-
/***************************************************************************/ /* */ /* t1gload.c */ /* */ /* Type 1 Glyph Loader (body). */ /* */ /* Copyright 1996-2001 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 "t1gload.h" #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_STREAM_H #include FT_OUTLINE_H #include FT_INTERNAL_POSTSCRIPT_AUX_H #include "t1errors.h" #include <string.h> /* for strcmp() */ /*************************************************************************/ /* */ /* 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_t1gload /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ /********** *********/ /********** The following code is in charge of computing *********/ /********** the maximum advance width of the font. It *********/ /********** quickly processes each glyph charstring to *********/ /********** extract the value from either a `sbw' or `seac' *********/ /********** operator. *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ FT_CALLBACK_DEF( FT_Error ) T1_Parse_Glyph( T1_Decoder* decoder, FT_UInt glyph_index ) { T1_Face face = (T1_Face)decoder->builder.face; T1_Font* type1 = &face->type1; decoder->font_matrix = type1->font_matrix; decoder->font_offset = type1->font_offset; return decoder->funcs.parse_charstrings( decoder, type1->charstrings [glyph_index], type1->charstrings_len[glyph_index] ); } FT_LOCAL_DEF FT_Error T1_Compute_Max_Advance( T1_Face face, FT_Int* max_advance ) { FT_Error error; T1_Decoder decoder; FT_Int glyph_index; T1_Font* type1 = &face->type1; PSAux_Interface* psaux = (PSAux_Interface*)face->psaux; *max_advance = 0; /* initialize load decoder */ error = psaux->t1_decoder_funcs->init( &decoder, (FT_Face)face, 0, /* size */ 0, /* glyph slot */ (FT_Byte**)type1->glyph_names, face->blend, T1_Parse_Glyph ); if ( error ) return error; decoder.builder.metrics_only = 1; decoder.builder.load_points = 0; decoder.num_subrs = type1->num_subrs; decoder.subrs = type1->subrs; decoder.subrs_len = type1->subrs_len; /* for each glyph, parse the glyph charstring and extract */ /* the advance width */ for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ ) { /* now get load the unscaled outline */ error = T1_Parse_Glyph( &decoder, glyph_index ); /* ignore the error if one occured - skip to next glyph */ } *max_advance = decoder.builder.advance.x; return T1_Err_Ok; } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** UNHINTED GLYPH LOADER *********/ /********** *********/ /********** The following code is in charge of loading a *********/ /********** single outline. It completely ignores hinting *********/ /********** and is used when FT_LOAD_NO_HINTING is set. *********/ /********** *********/ /********** The Type 1 hinter is located in `t1hint.c' *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF FT_Error T1_Load_Glyph( T1_GlyphSlot glyph, T1_Size size, FT_Int glyph_index, FT_Int load_flags ) { FT_Error error; T1_Decoder decoder; T1_Face face = (T1_Face)glyph->root.face; FT_Bool hinting; T1_Font* type1 = &face->type1; PSAux_Interface* psaux = (PSAux_Interface*)face->psaux; const T1_Decoder_Funcs* decoder_funcs = psaux->t1_decoder_funcs; FT_Matrix font_matrix; FT_Vector font_offset; if ( load_flags & FT_LOAD_NO_RECURSE ) load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; glyph->x_scale = size->root.metrics.x_scale; glyph->y_scale = size->root.metrics.y_scale; glyph->root.outline.n_points = 0; glyph->root.outline.n_contours = 0; hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 && ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); glyph->root.format = ft_glyph_format_outline; error = decoder_funcs->init( &decoder, (FT_Face)face, (FT_Size)size, (FT_GlyphSlot)glyph, (FT_Byte**)type1->glyph_names, face->blend, T1_Parse_Glyph ); if ( error ) goto Exit; decoder.builder.no_recurse = FT_BOOL( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ); decoder.num_subrs = type1->num_subrs; decoder.subrs = type1->subrs; decoder.subrs_len = type1->subrs_len; /* now load the unscaled outline */ error = T1_Parse_Glyph( &decoder, glyph_index ); if ( error ) goto Exit; font_matrix = decoder.font_matrix; font_offset = decoder.font_offset; /* save new glyph tables */ decoder_funcs->done( &decoder ); /* now, set the metrics -- this is rather simple, as */ /* the left side bearing is the xMin, and the top side */ /* bearing the yMax */ if ( !error ) { glyph->root.outline.flags &= ft_outline_owner; glyph->root.outline.flags |= ft_outline_reverse_fill; /* for composite glyphs, return only left side bearing and */ /* advance width */ if ( load_flags & FT_LOAD_NO_RECURSE ) { FT_Slot_Internal internal = glyph->root.internal; glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x; glyph->root.metrics.horiAdvance = decoder.builder.advance.x; internal->glyph_matrix = font_matrix; internal->glyph_delta = font_offset; internal->glyph_transformed = 1; } else { FT_BBox cbox; FT_Glyph_Metrics* metrics = &glyph->root.metrics; /* copy the _unscaled_ advance width */ metrics->horiAdvance = decoder.builder.advance.x; glyph->root.linearHoriAdvance = decoder.builder.advance.x; glyph->root.internal->glyph_transformed = 0; /* make up vertical metrics */ metrics->vertBearingX = 0; metrics->vertBearingY = 0; metrics->vertAdvance = 0; glyph->root.linearVertAdvance = 0; glyph->root.format = ft_glyph_format_outline; if ( size && size->root.metrics.y_ppem < 24 ) glyph->root.outline.flags |= ft_outline_high_precision; /* apply the font matrix */ FT_Outline_Transform( &glyph->root.outline, &font_matrix ); FT_Outline_Translate( &glyph->root.outline, font_offset.x, font_offset.y ); #if 0 glyph->root.outline.second_pass = TRUE; glyph->root.outline.high_precision = size->root.metrics.y_ppem < 24; glyph->root.outline.dropout_mode = 2; #endif /* 0 */ if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ) { /* scale the outline and the metrics */ FT_Int n; FT_Outline* cur = decoder.builder.base; FT_Vector* vec = cur->points; FT_Fixed x_scale = glyph->x_scale; FT_Fixed y_scale = glyph->y_scale; /* First of all, scale the points */ for ( n = cur->n_points; n > 0; n--, vec++ ) { vec->x = FT_MulFix( vec->x, x_scale ); vec->y = FT_MulFix( vec->y, y_scale ); } FT_Outline_Get_CBox( &glyph->root.outline, &cbox ); /* Then scale the metrics */ metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale ); metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale ); } /* compute the other metrics */ FT_Outline_Get_CBox( &glyph->root.outline, &cbox ); /* grid fit the bounding box if necessary */ if ( hinting ) { cbox.xMin &= -64; cbox.yMin &= -64; cbox.xMax = ( cbox.xMax+63 ) & -64; cbox.yMax = ( cbox.yMax+63 ) & -64; } metrics->width = cbox.xMax - cbox.xMin; metrics->height = cbox.yMax - cbox.yMin; metrics->horiBearingX = cbox.xMin; metrics->horiBearingY = cbox.yMax; } /* Set control data to the glyph charstrings. Note that this is */ /* _not_ zero-terminated. */ glyph->root.control_data = type1->charstrings [glyph_index]; glyph->root.control_len = type1->charstrings_len[glyph_index]; } Exit: return error; } /* END */