Edit
kc3-lang/freetype/src/cid/cidgload.c
Werner Lemberg
- src/cid/cidgload.c
-
/***************************************************************************/ /* */ /* cidgload.c */ /* */ /* CID-keyed Type1 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 "cidload.h" #include "cidgload.h" #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_STREAM_H #include FT_OUTLINE_H #include "ciderrs.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 trace_cidgload FT_CALLBACK_DEF( FT_Error ) cid_load_glyph( T1_Decoder* decoder, FT_UInt glyph_index ) { CID_Face face = (CID_Face)decoder->builder.face; CID_Info* cid = &face->cid; FT_Byte* p; FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes; FT_UInt fd_select; FT_ULong off1, glyph_len; FT_Stream stream = face->root.stream; FT_Error error = 0; /* read the CID font dict index and charstring offset from the CIDMap */ if ( FILE_Seek( cid->data_offset + cid->cidmap_offset + glyph_index * entry_len ) || ACCESS_Frame( 2 * entry_len ) ) goto Exit; p = (FT_Byte*)stream->cursor; fd_select = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes ); off1 = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes ); p += cid->fd_bytes; glyph_len = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1; FORGET_Frame(); /* now, if the glyph is not empty, set up the subrs array, and parse */ /* the charstrings */ if ( glyph_len > 0 ) { CID_FontDict* dict; CID_Subrs* cid_subrs = face->subrs + fd_select; FT_Byte* charstring; FT_Memory memory = face->root.memory; /* setup subrs */ decoder->num_subrs = cid_subrs->num_subrs; decoder->subrs = cid_subrs->code; decoder->subrs_len = 0; /* setup font matrix */ dict = cid->font_dicts + fd_select; decoder->font_matrix = dict->font_matrix; decoder->font_offset = dict->font_offset; decoder->lenIV = dict->private_dict.lenIV; /* the charstrings are encoded (stupid!) */ /* load the charstrings, then execute it */ if ( ALLOC( charstring, glyph_len ) ) goto Exit; if ( !FILE_Read_At( cid->data_offset + off1, charstring, glyph_len ) ) { FT_Int cs_offset; /* Adjustment for seed bytes. */ cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 ); /* Decrypt only if lenIV >= 0. */ if ( decoder->lenIV >= 0 ) cid_decrypt( charstring, glyph_len, 4330 ); error = decoder->funcs.parse_charstrings( decoder, charstring + cs_offset, glyph_len - cs_offset ); } FREE( charstring ); } Exit: return error; } #if 0 /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** *********/ /********** 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_LOCAL_DEF FT_Error CID_Compute_Max_Advance( CID_Face face, FT_Int* max_advance ) { FT_Error error; T1_Decoder decoder; FT_Int glyph_index; 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 */ 0, /* glyph names! XXX */ 0, /* blend == 0 */ cid_load_glyph ); if ( error ) return error; decoder.builder.metrics_only = 1; decoder.builder.load_points = 0; /* for each glyph, parse the glyph charstring and extract */ /* the advance width */ for ( glyph_index = 0; glyph_index < face->root.num_glyphs; glyph_index++ ) { /* now get load the unscaled outline */ error = cid_load_glyph( &decoder, glyph_index ); /* ignore the error if one occurred - skip to next glyph */ } *max_advance = decoder.builder.advance.x; return CID_Err_Ok; } #endif /* 0 */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /********** *********/ /********** *********/ /********** 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. *********/ /********** *********/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ FT_LOCAL_DEF FT_Error CID_Load_Glyph( CID_GlyphSlot glyph, CID_Size size, FT_Int glyph_index, FT_Int load_flags ) { FT_Error error; T1_Decoder decoder; CID_Face face = (CID_Face)glyph->root.face; FT_Bool hinting; PSAux_Interface* psaux = (PSAux_Interface*)face->psaux; 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 = psaux->t1_decoder_funcs->init( &decoder, (FT_Face)face, (FT_Size)size, (FT_GlyphSlot)glyph, 0, /* glyph names -- XXX */ 0, /* blend == 0 */ cid_load_glyph ); /* set up the decoder */ decoder.builder.no_recurse = FT_BOOL( ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) ); error = cid_load_glyph( &decoder, glyph_index ); font_matrix = decoder.font_matrix; font_offset = decoder.font_offset; /* save new glyph tables */ psaux->t1_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 ( ( 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; } } return error; } /* END */