| /***************************************************************************/ |
| /* */ |
| /* cidgload.c */ |
| /* */ |
| /* CID-keyed Type1 Glyph Loader (body). */ |
| /* */ |
| /* Copyright 1996-2015 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 FT_INTERNAL_CALC_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_ULong fd_select; |
| FT_Stream stream = face->cid_stream; |
| FT_Error error = FT_Err_Ok; |
| FT_Byte* charstring = NULL; |
| FT_Memory memory = face->root.memory; |
| FT_ULong glyph_length = 0; |
| PSAux_Service psaux = (PSAux_Service)face->psaux; |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| FT_Incremental_InterfaceRec *inc = |
| face->root.internal->incremental_interface; |
| #endif |
| |
| |
| FT_TRACE1(( "cid_load_glyph: glyph index %d\n", glyph_index )); |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| |
| /* For incremental fonts get the character data using */ |
| /* the callback function. */ |
| if ( inc ) |
| { |
| FT_Data glyph_data; |
| |
| |
| error = inc->funcs->get_glyph_data( inc->object, |
| glyph_index, &glyph_data ); |
| if ( error ) |
| goto Exit; |
| |
| p = (FT_Byte*)glyph_data.pointer; |
| fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes ); |
| |
| if ( glyph_data.length != 0 ) |
| { |
| glyph_length = (FT_ULong)( 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 ); |
| } |
| |
| inc->funcs->free_glyph_data( inc->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 = (FT_UInt)( 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 = cid_get_offset( &p, (FT_Byte)cid->fd_bytes ); |
| off1 = 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_ULong)cid->num_dicts ) |
| { |
| error = FT_THROW( 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_UInt 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 ? (FT_UInt)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, |
| glyph_length - cs_offset ); |
| } |
| |
| FT_FREE( charstring ); |
| |
| #ifdef FT_CONFIG_OPTION_INCREMENTAL |
| |
| /* Incremental fonts can optionally override the metrics. */ |
| if ( !error && inc && inc->funcs->get_glyph_metrics ) |
| { |
| FT_Incremental_MetricsRec metrics; |
| |
| |
| metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x ); |
| metrics.bearing_y = 0; |
| metrics.advance = FIXED_TO_INT( decoder->builder.advance.x ); |
| metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y ); |
| |
| error = inc->funcs->get_glyph_metrics( inc->object, |
| glyph_index, FALSE, &metrics ); |
| |
| decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x ); |
| decoder->builder.advance.x = INT_TO_FIXED( metrics.advance ); |
| decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v ); |
| } |
| |
| #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 = FIXED_TO_INT( decoder.builder.advance.x ); |
| |
| psaux->t1_decoder_funcs->done( &decoder ); |
| |
| return FT_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; |
| 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 = FT_THROW( 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 = |
| FIXED_TO_INT( decoder.builder.left_bearing.x ); |
| cidglyph->metrics.horiAdvance = |
| FIXED_TO_INT( 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 = |
| FIXED_TO_INT( decoder.builder.advance.x ); |
| cidglyph->linearHoriAdvance = |
| FIXED_TO_INT( 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 ( 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; |
| |
| if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) |
| { |
| /* make up vertical ones */ |
| ft_synthesize_vertical_metrics( metrics, |
| metrics->vertAdvance ); |
| } |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| /* END */ |
