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/***************************************************************************/
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/* FreeType API for checking patented TrueType bytecode instructions */
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/* Copyright 2007, 2008, 2010 by David Turner. */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/***************************************************************************/
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#include FT_FREETYPE_H
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#include FT_TRUETYPE_TAGS_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_STREAM_H
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#include FT_SERVICE_SFNT_H
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#include FT_SERVICE_TRUETYPE_GLYF_H
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_tt_check_patents_in_range( FT_Stream stream,
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FT_Bool result = FALSE;
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if ( FT_FRAME_ENTER( size ) )
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case 0x06: /* SPvTL // */
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case 0x07: /* SPvTL + */
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case 0x08: /* SFvTL // */
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case 0x09: /* SFvTL + */
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case 0x0A: /* SPvFS */
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case 0x0B: /* SFvFS */
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case 0x71: /* DELTAP2 */
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case 0x72: /* DELTAP3 */
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case 0x73: /* DELTAC0 */
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case 0x74: /* DELTAC1 */
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case 0x75: /* DELTAC2 */
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p += ( p[0] - 0xB0 ) + 2;
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p += ( p[0] - 0xB8 ) * 2 + 3;
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_tt_check_patents_in_table( FT_Face face,
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FT_Stream stream = face->stream;
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FT_Error error = FT_Err_Ok;
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FT_Service_SFNT_Table service;
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FT_Bool result = FALSE;
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FT_FACE_FIND_SERVICE( face, service, SFNT_TABLE );
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FT_ULong tag_i = 0, offset_i = 0, length_i = 0;
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for ( i = 0; !error && tag_i != tag ; i++ )
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error = service->table_info( face, i,
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&tag_i, &offset_i, &length_i );
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FT_STREAM_SEEK( offset_i ) )
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result = _tt_check_patents_in_range( stream, length_i );
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_tt_face_check_patents( FT_Face face )
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FT_Stream stream = face->stream;
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FT_Service_TTGlyf service;
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result = _tt_check_patents_in_table( face, TTAG_fpgm );
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result = _tt_check_patents_in_table( face, TTAG_prep );
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FT_FACE_FIND_SERVICE( face, service, TT_GLYF );
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if ( service == NULL )
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for ( gindex = 0; gindex < (FT_UInt)face->num_glyphs; gindex++ )
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FT_ULong offset, num_ins, size;
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offset = service->get_location( face, gindex, &size );
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if ( FT_STREAM_SEEK( offset ) ||
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FT_READ_SHORT( num_contours ) )
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if ( num_contours >= 0 ) /* simple glyph */
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if ( FT_STREAM_SKIP( 8 + num_contours * 2 ) )
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else /* compound glyph */
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FT_Bool has_instr = 0;
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if ( FT_STREAM_SKIP( 8 ) )
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/* now read each component */
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FT_UInt flags, toskip;
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if( FT_READ_USHORT( flags ) )
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if ( ( flags & ( 1 << 0 ) ) != 0 ) /* ARGS_ARE_WORDS */
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if ( ( flags & ( 1 << 3 ) ) != 0 ) /* WE_HAVE_A_SCALE */
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else if ( ( flags & ( 1 << 6 ) ) != 0 ) /* WE_HAVE_X_Y_SCALE */
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else if ( ( flags & ( 1 << 7 ) ) != 0 ) /* WE_HAVE_A_2x2 */
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if ( ( flags & ( 1 << 8 ) ) != 0 ) /* WE_HAVE_INSTRUCTIONS */
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if ( FT_STREAM_SKIP( toskip ) )
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if ( ( flags & ( 1 << 5 ) ) == 0 ) /* MORE_COMPONENTS */
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if ( FT_READ_USHORT( num_ins ) )
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result = _tt_check_patents_in_range( stream, num_ins );
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/* documentation is in freetype.h */
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FT_EXPORT_DEF( FT_Bool )
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FT_Face_CheckTrueTypePatents( FT_Face face )
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FT_Bool result = FALSE;
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if ( face && FT_IS_SFNT( face ) )
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result = _tt_face_check_patents( face );
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/* documentation is in freetype.h */
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FT_EXPORT_DEF( FT_Bool )
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FT_Face_SetUnpatentedHinting( FT_Face face,
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FT_Bool result = FALSE;
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#if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING ) && \
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!defined( TT_CONFIG_OPTION_BYTECODE_INTEPRETER )
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if ( face && FT_IS_SFNT( face ) )
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result = !face->internal->ignore_unpatented_hinter;
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face->internal->ignore_unpatented_hinter = !value;