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kc3-lang/freetype/src/type1/t1gload.c
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Author :
Werner Lemberg
Date : 2006-11-19 09:19:17
Hash : 913a3650
Message : Because FT_Load_Glyph expects CID values for CID-keyed fonts, the test for a valid glyph index must be deferred to the font drivers. This patch fixes Savannah bug #18301. * src/base/ftobjs.c (FT_Load_Glyph): Don't check `glyph_index'. * src/bdf/bdfdrivr.c (BDF_Glyph_Load), src/cff/cffgload.c (cff_slot_load), src/cid/cidgload.c (cid_slot_load_glyph), src/pcf/pcfdrivr.c (PCF_Glyph_Load), src/pfr/pfrobjs.c (pfr_slot_load), src/truetype/ttdriver.c (Load_Glyph), src/type1/t1gload.c (T1_Load_Glyph), src/winfonts/winfnt.c (FNT_Load_Glyph): Check validity of `glyph_index'.
- src/type1/t1gload.c
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/***************************************************************************/ /* */ /* t1gload.c */ /* */ /* Type 1 Glyph Loader (body). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 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" /*************************************************************************/ /* */ /* 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_LOCAL_DEF( FT_Error ) T1_Parse_Glyph_And_Get_Char_String( T1_Decoder decoder, FT_UInt glyph_index, FT_Data* char_string ) { T1_Face face = (T1_Face)decoder->builder.face; T1_Font type1 = &face->type1; FT_Error error = T1_Err_Ok; decoder->font_matrix = type1->font_matrix; decoder->font_offset = type1->font_offset; #ifdef FT_CONFIG_OPTION_INCREMENTAL /* For incremental fonts get the character data using the */ /* callback function. */ if ( face->root.internal->incremental_interface ) error = face->root.internal->incremental_interface->funcs->get_glyph_data( face->root.internal->incremental_interface->object, glyph_index, char_string ); else #endif /* FT_CONFIG_OPTION_INCREMENTAL */ /* For ordinary fonts get the character data stored in the face record. */ { char_string->pointer = type1->charstrings[glyph_index]; char_string->length = (FT_Int)type1->charstrings_len[glyph_index]; } if ( !error ) error = decoder->funcs.parse_charstrings( decoder, (FT_Byte*)char_string->pointer, char_string->length ); #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 */ return error; } FT_CALLBACK_DEF( FT_Error ) T1_Parse_Glyph( T1_Decoder decoder, FT_UInt glyph_index ) { FT_Data glyph_data; FT_Error error = T1_Parse_Glyph_And_Get_Char_String( decoder, glyph_index, &glyph_data ); #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( !error ) { T1_Face face = (T1_Face)decoder->builder.face; if ( face->root.internal->incremental_interface ) face->root.internal->incremental_interface->funcs->free_glyph_data( face->root.internal->incremental_interface->object, &glyph_data ); } #endif /* FT_CONFIG_OPTION_INCREMENTAL */ return error; } FT_LOCAL_DEF( FT_Error ) T1_Compute_Max_Advance( T1_Face face, FT_Pos* max_advance ) { FT_Error error; T1_DecoderRec decoder; FT_Int glyph_index; T1_Font type1 = &face->type1; PSAux_Service psaux = (PSAux_Service)face->psaux; FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) ); *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, 0, FT_RENDER_MODE_NORMAL, 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; decoder.buildchar = face->buildchar; decoder.len_buildchar = face->len_buildchar; *max_advance = 0; /* 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 ); if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance ) *max_advance = decoder.builder.advance.x; /* ignore the error if one occurred - skip to next glyph */ } psaux->t1_decoder_funcs->done( &decoder ); return T1_Err_Ok; } FT_LOCAL_DEF( FT_Error ) T1_Load_Glyph( T1_GlyphSlot glyph, T1_Size size, FT_UInt glyph_index, FT_Int32 load_flags ) { FT_Error error; T1_DecoderRec decoder; T1_Face face = (T1_Face)glyph->root.face; FT_Bool hinting; T1_Font type1 = &face->type1; PSAux_Service psaux = (PSAux_Service)face->psaux; const T1_Decoder_Funcs decoder_funcs = psaux->t1_decoder_funcs; FT_Matrix font_matrix; FT_Vector font_offset; FT_Data glyph_data; FT_Bool must_finish_decoder = FALSE; #ifdef FT_CONFIG_OPTION_INCREMENTAL FT_Bool glyph_data_loaded = 0; #endif if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) { error = T1_Err_Invalid_Argument; goto Exit; } FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) ); 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, FT_BOOL( hinting ), FT_LOAD_TARGET_MODE( load_flags ), T1_Parse_Glyph ); if ( error ) goto Exit; must_finish_decoder = TRUE; 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; decoder.buildchar = face->buildchar; decoder.len_buildchar = face->len_buildchar; /* now load the unscaled outline */ error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index, &glyph_data ); if ( error ) goto Exit; #ifdef FT_CONFIG_OPTION_INCREMENTAL glyph_data_loaded = 1; #endif font_matrix = decoder.font_matrix; font_offset = decoder.font_offset; /* save new glyph tables */ decoder_funcs->done( &decoder ); must_finish_decoder = FALSE; /* 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; FT_Vector advance; /* 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 ones */ metrics->vertAdvance = ( face->type1.font_bbox.yMax - face->type1.font_bbox.yMin ) >> 16; glyph->root.linearVertAdvance = metrics->vertAdvance; glyph->root.format = FT_GLYPH_FORMAT_OUTLINE; if ( size && size->root.metrics.y_ppem < 24 ) glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION; #if 1 /* apply the font matrix, if any */ if ( font_matrix.xx != 0x10000L || font_matrix.yy != font_matrix.xx || font_matrix.xy != 0 || font_matrix.yx != 0 ) FT_Outline_Transform( &glyph->root.outline, &font_matrix ); if ( font_offset.x || font_offset.y ) FT_Outline_Translate( &glyph->root.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; #endif 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 we are not hinting */ 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( &glyph->root.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 ); } /* Set control data to the glyph charstrings. Note that this is */ /* _not_ zero-terminated. */ glyph->root.control_data = (FT_Byte*)glyph_data.pointer; glyph->root.control_len = glyph_data.length; } Exit: #ifdef FT_CONFIG_OPTION_INCREMENTAL if ( glyph_data_loaded && face->root.internal->incremental_interface ) { face->root.internal->incremental_interface->funcs->free_glyph_data( face->root.internal->incremental_interface->object, &glyph_data ); /* Set the control data to null - it is no longer available if */ /* loaded incrementally. */ glyph->root.control_data = 0; glyph->root.control_len = 0; } #endif if ( must_finish_decoder ) decoder_funcs->done( &decoder ); return error; } /* END */