ref: c6788a389d9003c5c6b86f30047e05658416f7d6
dir: /src/cid/cidgload.c/
/***************************************************************************/ /* */ /* cidgload.c */ /* */ /* CID-keyed Type1 Glyph Loader (body). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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_FaceInfo cid = &face->cid; FT_Byte* p; FT_UInt fd_select; FT_Stream stream = face->cid_stream; FT_Error error = CID_Err_Ok; FT_Byte* charstring = 0; FT_Memory memory = face->root.memory; FT_ULong glyph_length = 0; PSAux_Service psaux = (PSAux_Service)face->psaux; #ifdef FT_CONFIG_OPTION_INCREMENTAL /* For incremental fonts get the character data using */ /* the callback function. */ if ( face->root.internal->incremental_interface ) { FT_Data glyph_data; error = face->root.internal->incremental_interface->funcs->get_glyph_data( face->root.internal->incremental_interface->object, glyph_index, &glyph_data ); if ( error ) goto Exit; p = (FT_Byte*)glyph_data.pointer; fd_select = (FT_UInt)cid_get_offset( &p, (FT_Byte)cid->fd_bytes ); if ( glyph_data.length != 0 ) { glyph_length = glyph_data.length - cid->fd_bytes; (void)FT_ALLOC( charstring, glyph_length ); if ( !error ) ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes, glyph_length ); } face->root.internal->incremental_interface->funcs->free_glyph_data( face->root.internal->incremental_interface->object, &glyph_data ); if ( error ) goto Exit; } else #endif /* FT_CONFIG_OPTION_INCREMENTAL */ /* For ordinary fonts read the CID font dictionary index */ /* and charstring offset from the CIDMap. */ { FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes; FT_ULong off1; if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset + glyph_index * entry_len ) || FT_FRAME_ENTER( 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_length = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1; FT_FRAME_EXIT(); if ( fd_select >= (FT_UInt)cid->num_dicts ) { error = CID_Err_Invalid_Offset; goto Exit; } if ( glyph_length == 0 ) goto Exit; if ( FT_ALLOC( charstring, glyph_length ) ) goto Exit; if ( FT_STREAM_READ_AT( cid->data_offset + off1, charstring, glyph_length ) ) goto Exit; } /* Now set up the subrs array and parse the charstrings. */ { CID_FaceDict dict; CID_Subrs cid_subrs = face->subrs + fd_select; FT_Int cs_offset; /* Set up subrs */ decoder->num_subrs = cid_subrs->num_subrs; decoder->subrs = cid_subrs->code; decoder->subrs_len = 0; /* Set up 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; /* Decode the charstring. */ /* Adjustment for seed bytes. */ cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 ); /* Decrypt only if lenIV >= 0. */ if ( decoder->lenIV >= 0 ) psaux->t1_decrypt( charstring, glyph_length, 4330 ); error = decoder->funcs.parse_charstrings( decoder, charstring + cs_offset, (FT_Int)glyph_length - cs_offset ); } FT_FREE( charstring ); #ifdef FT_CONFIG_OPTION_INCREMENTAL /* Incremental fonts can optionally override the metrics. */ if ( !error && face->root.internal->incremental_interface && face->root.internal->incremental_interface->funcs->get_glyph_metrics ) { FT_Incremental_MetricsRec metrics; metrics.bearing_x = decoder->builder.left_bearing.x; metrics.bearing_y = decoder->builder.left_bearing.y; metrics.advance = decoder->builder.advance.x; error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( face->root.internal->incremental_interface->object, glyph_index, FALSE, &metrics ); decoder->builder.left_bearing.x = metrics.bearing_x; decoder->builder.left_bearing.y = metrics.bearing_y; decoder->builder.advance.x = metrics.advance; decoder->builder.advance.y = 0; } #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 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_face_compute_max_advance( CID_Face face, FT_Int* max_advance ) { FT_Error error; T1_DecoderRec decoder; FT_Int glyph_index; PSAux_Service psaux = (PSAux_Service)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 */ 0, /* hinting == 0 */ cid_load_glyph ); if ( error ) return error; /* TODO: initialize decoder.len_buildchar and decoder.buildchar */ /* if we ever support CID-keyed multiple master fonts */ 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; psaux->t1_decoder_funcs->done( &decoder ); return CID_Err_Ok; } #endif /* 0 */ FT_LOCAL_DEF( FT_Error ) cid_slot_load_glyph( FT_GlyphSlot cidglyph, /* CID_GlyphSlot */ FT_Size cidsize, /* CID_Size */ FT_UInt glyph_index, FT_Int32 load_flags ) { CID_GlyphSlot glyph = (CID_GlyphSlot)cidglyph; CID_Size size = (CID_Size)cidsize; FT_Error error; T1_DecoderRec decoder; CID_Face face = (CID_Face)cidglyph->face; FT_Bool hinting; PSAux_Service psaux = (PSAux_Service)face->psaux; FT_Matrix font_matrix; FT_Vector font_offset; if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) { error = CID_Err_Invalid_Argument; goto Exit; } if ( load_flags & FT_LOAD_NO_RECURSE ) load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; glyph->x_scale = cidsize->metrics.x_scale; glyph->y_scale = cidsize->metrics.y_scale; cidglyph->outline.n_points = 0; cidglyph->outline.n_contours = 0; hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 && ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); cidglyph->format = FT_GLYPH_FORMAT_OUTLINE; error = psaux->t1_decoder_funcs->init( &decoder, cidglyph->face, cidsize, cidglyph, 0, /* glyph names -- XXX */ 0, /* blend == 0 */ hinting, FT_LOAD_TARGET_MODE( load_flags ), cid_load_glyph ); if ( error ) goto Exit; /* TODO: initialize decoder.len_buildchar and decoder.buildchar */ /* if we ever support CID-keyed multiple master fonts */ /* set up the decoder */ decoder.builder.no_recurse = FT_BOOL( ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) ); error = cid_load_glyph( &decoder, glyph_index ); if ( error ) goto Exit; 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 */ cidglyph->outline.flags &= FT_OUTLINE_OWNER; cidglyph->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 = cidglyph->internal; cidglyph->metrics.horiBearingX = decoder.builder.left_bearing.x; cidglyph->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 = &cidglyph->metrics; FT_Vector advance; /* copy the _unscaled_ advance width */ metrics->horiAdvance = decoder.builder.advance.x; cidglyph->linearHoriAdvance = decoder.builder.advance.x; cidglyph->internal->glyph_transformed = 0; /* make up vertical ones */ metrics->vertAdvance = ( face->cid.font_bbox.yMax - face->cid.font_bbox.yMin ) >> 16; cidglyph->linearVertAdvance = metrics->vertAdvance; cidglyph->format = FT_GLYPH_FORMAT_OUTLINE; if ( size && cidsize->metrics.y_ppem < 24 ) cidglyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; /* apply the font matrix */ FT_Outline_Transform( &cidglyph->outline, &font_matrix ); FT_Outline_Translate( &cidglyph->outline, font_offset.x, font_offset.y ); advance.x = metrics->horiAdvance; advance.y = 0; FT_Vector_Transform( &advance, &font_matrix ); metrics->horiAdvance = advance.x + font_offset.x; advance.x = 0; advance.y = metrics->vertAdvance; FT_Vector_Transform( &advance, &font_matrix ); metrics->vertAdvance = advance.y + 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 */ if ( !hinting || !decoder.builder.hints_funcs ) 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 ); } /* Then scale the metrics */ metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); } /* compute the other metrics */ FT_Outline_Get_CBox( &cidglyph->outline, &cbox ); metrics->width = cbox.xMax - cbox.xMin; metrics->height = cbox.yMax - cbox.yMin; metrics->horiBearingX = cbox.xMin; metrics->horiBearingY = cbox.yMax; /* make up vertical ones */ ft_synthesize_vertical_metrics( metrics, metrics->vertAdvance ); } Exit: return error; } /* END */