kc3-lang/freetype/src/cff/cf2intrp.c
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Hash : 950f1696
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Date : 2016-02-07T11:39:54
[cff] Implement missing operators in new engine (except `random'). * src/cff/cf2font.h (CF2_STORAGE_SIZE): New macro. * src/cff/cf2intrp.c (cf2_interpT2CharString): Implement the following operators: abs, add, and, div, drop, dup, eq, exch, get, ifelse, index, mul, neg, not, or, put, roll, sqrt, sub. * src/cff/cf2stack.h, src/cff/cf2stack.c (cf2_stack_roll): New auxiliary function for `roll' operator.
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src/cff/cf2intrp.c
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/***************************************************************************/ /* */ /* cf2intrp.c */ /* */ /* Adobe's CFF Interpreter (body). */ /* */ /* Copyright 2007-2014 Adobe Systems Incorporated. */ /* */ /* This software, and all works of authorship, whether in source or */ /* object code form as indicated by the copyright notice(s) included */ /* herein (collectively, the "Work") is made available, and may only be */ /* used, modified, and distributed under the FreeType Project License, */ /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ /* FreeType Project License, each contributor to the Work hereby grants */ /* to any individual or legal entity exercising permissions granted by */ /* the FreeType Project License and this section (hereafter, "You" or */ /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ /* royalty-free, irrevocable (except as stated in this section) patent */ /* license to make, have made, use, offer to sell, sell, import, and */ /* otherwise transfer the Work, where such license applies only to those */ /* patent claims licensable by such contributor that are necessarily */ /* infringed by their contribution(s) alone or by combination of their */ /* contribution(s) with the Work to which such contribution(s) was */ /* submitted. If You institute patent litigation against any entity */ /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ /* the Work or a contribution incorporated within the Work constitutes */ /* direct or contributory patent infringement, then any patent licenses */ /* granted to You under this License for that Work shall terminate as of */ /* the date such litigation is filed. */ /* */ /* By using, modifying, or distributing the Work you indicate that you */ /* have read and understood the terms and conditions of the */ /* FreeType Project License as well as those provided in this section, */ /* and you accept them fully. */ /* */ /***************************************************************************/ #include "cf2ft.h" #include FT_INTERNAL_DEBUG_H #include "cf2glue.h" #include "cf2font.h" #include "cf2stack.h" #include "cf2hints.h" #include "cf2intrp.h" #include "cf2error.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_cf2interp /* some operators are not implemented yet */ #define CF2_FIXME FT_TRACE4(( "cf2_interpT2CharString:" \ " operator not implemented yet\n" )) FT_LOCAL_DEF( void ) cf2_hintmask_init( CF2_HintMask hintmask, FT_Error* error ) { FT_ZERO( hintmask ); hintmask->error = error; } FT_LOCAL_DEF( FT_Bool ) cf2_hintmask_isValid( const CF2_HintMask hintmask ) { return hintmask->isValid; } FT_LOCAL_DEF( FT_Bool ) cf2_hintmask_isNew( const CF2_HintMask hintmask ) { return hintmask->isNew; } FT_LOCAL_DEF( void ) cf2_hintmask_setNew( CF2_HintMask hintmask, FT_Bool val ) { hintmask->isNew = val; } /* clients call `getMaskPtr' in order to iterate */ /* through hint mask */ FT_LOCAL_DEF( FT_Byte* ) cf2_hintmask_getMaskPtr( CF2_HintMask hintmask ) { return hintmask->mask; } static size_t cf2_hintmask_setCounts( CF2_HintMask hintmask, size_t bitCount ) { if ( bitCount > CF2_MAX_HINTS ) { /* total of h and v stems must be <= 96 */ CF2_SET_ERROR( hintmask->error, Invalid_Glyph_Format ); return 0; } hintmask->bitCount = bitCount; hintmask->byteCount = ( hintmask->bitCount + 7 ) / 8; hintmask->isValid = TRUE; hintmask->isNew = TRUE; return bitCount; } /* consume the hintmask bytes from the charstring, advancing the src */ /* pointer */ static void cf2_hintmask_read( CF2_HintMask hintmask, CF2_Buffer charstring, size_t bitCount ) { size_t i; #ifndef CF2_NDEBUG /* these are the bits in the final mask byte that should be zero */ /* Note: this variable is only used in an assert expression below */ /* and then only if CF2_NDEBUG is not defined */ CF2_UInt mask = ( 1 << ( -(CF2_Int)bitCount & 7 ) ) - 1; #endif /* initialize counts and isValid */ if ( cf2_hintmask_setCounts( hintmask, bitCount ) == 0 ) return; FT_ASSERT( hintmask->byteCount > 0 ); FT_TRACE4(( " (maskbytes:" )); /* set mask and advance interpreter's charstring pointer */ for ( i = 0; i < hintmask->byteCount; i++ ) { hintmask->mask[i] = (FT_Byte)cf2_buf_readByte( charstring ); FT_TRACE4(( " 0x%02X", hintmask->mask[i] )); } FT_TRACE4(( ")\n" )); /* assert any unused bits in last byte are zero unless there's a prior */ /* error */ /* bitCount -> mask, 0 -> 0, 1 -> 7f, 2 -> 3f, ... 6 -> 3, 7 -> 1 */ #ifndef CF2_NDEBUG FT_ASSERT( ( hintmask->mask[hintmask->byteCount - 1] & mask ) == 0 || *hintmask->error ); #endif } FT_LOCAL_DEF( void ) cf2_hintmask_setAll( CF2_HintMask hintmask, size_t bitCount ) { size_t i; CF2_UInt mask = ( 1 << ( -(CF2_Int)bitCount & 7 ) ) - 1; /* initialize counts and isValid */ if ( cf2_hintmask_setCounts( hintmask, bitCount ) == 0 ) return; FT_ASSERT( hintmask->byteCount > 0 ); FT_ASSERT( hintmask->byteCount <= sizeof ( hintmask->mask ) / sizeof ( hintmask->mask[0] ) ); /* set mask to all ones */ for ( i = 0; i < hintmask->byteCount; i++ ) hintmask->mask[i] = 0xFF; /* clear unused bits */ /* bitCount -> mask, 0 -> 0, 1 -> 7f, 2 -> 3f, ... 6 -> 3, 7 -> 1 */ hintmask->mask[hintmask->byteCount - 1] &= ~mask; } /* Type2 charstring opcodes */ enum { cf2_cmdRESERVED_0, /* 0 */ cf2_cmdHSTEM, /* 1 */ cf2_cmdRESERVED_2, /* 2 */ cf2_cmdVSTEM, /* 3 */ cf2_cmdVMOVETO, /* 4 */ cf2_cmdRLINETO, /* 5 */ cf2_cmdHLINETO, /* 6 */ cf2_cmdVLINETO, /* 7 */ cf2_cmdRRCURVETO, /* 8 */ cf2_cmdRESERVED_9, /* 9 */ cf2_cmdCALLSUBR, /* 10 */ cf2_cmdRETURN, /* 11 */ cf2_cmdESC, /* 12 */ cf2_cmdRESERVED_13, /* 13 */ cf2_cmdENDCHAR, /* 14 */ cf2_cmdRESERVED_15, /* 15 */ cf2_cmdRESERVED_16, /* 16 */ cf2_cmdRESERVED_17, /* 17 */ cf2_cmdHSTEMHM, /* 18 */ cf2_cmdHINTMASK, /* 19 */ cf2_cmdCNTRMASK, /* 20 */ cf2_cmdRMOVETO, /* 21 */ cf2_cmdHMOVETO, /* 22 */ cf2_cmdVSTEMHM, /* 23 */ cf2_cmdRCURVELINE, /* 24 */ cf2_cmdRLINECURVE, /* 25 */ cf2_cmdVVCURVETO, /* 26 */ cf2_cmdHHCURVETO, /* 27 */ cf2_cmdEXTENDEDNMBR, /* 28 */ cf2_cmdCALLGSUBR, /* 29 */ cf2_cmdVHCURVETO, /* 30 */ cf2_cmdHVCURVETO /* 31 */ }; enum { cf2_escDOTSECTION, /* 0 */ cf2_escRESERVED_1, /* 1 */ cf2_escRESERVED_2, /* 2 */ cf2_escAND, /* 3 */ cf2_escOR, /* 4 */ cf2_escNOT, /* 5 */ cf2_escRESERVED_6, /* 6 */ cf2_escRESERVED_7, /* 7 */ cf2_escRESERVED_8, /* 8 */ cf2_escABS, /* 9 */ cf2_escADD, /* 10 like otherADD */ cf2_escSUB, /* 11 like otherSUB */ cf2_escDIV, /* 12 */ cf2_escRESERVED_13, /* 13 */ cf2_escNEG, /* 14 */ cf2_escEQ, /* 15 */ cf2_escRESERVED_16, /* 16 */ cf2_escRESERVED_17, /* 17 */ cf2_escDROP, /* 18 */ cf2_escRESERVED_19, /* 19 */ cf2_escPUT, /* 20 like otherPUT */ cf2_escGET, /* 21 like otherGET */ cf2_escIFELSE, /* 22 like otherIFELSE */ cf2_escRANDOM, /* 23 like otherRANDOM */ cf2_escMUL, /* 24 like otherMUL */ cf2_escRESERVED_25, /* 25 */ cf2_escSQRT, /* 26 */ cf2_escDUP, /* 27 like otherDUP */ cf2_escEXCH, /* 28 like otherEXCH */ cf2_escINDEX, /* 29 */ cf2_escROLL, /* 30 */ cf2_escRESERVED_31, /* 31 */ cf2_escRESERVED_32, /* 32 */ cf2_escRESERVED_33, /* 33 */ cf2_escHFLEX, /* 34 */ cf2_escFLEX, /* 35 */ cf2_escHFLEX1, /* 36 */ cf2_escFLEX1 /* 37 */ }; /* `stemHintArray' does not change once we start drawing the outline. */ static void cf2_doStems( const CF2_Font font, CF2_Stack opStack, CF2_ArrStack stemHintArray, CF2_Fixed* width, FT_Bool* haveWidth, CF2_Fixed hintOffset ) { CF2_UInt i; CF2_UInt count = cf2_stack_count( opStack ); FT_Bool hasWidthArg = (FT_Bool)( count & 1 ); /* variable accumulates delta values from operand stack */ CF2_Fixed position = hintOffset; if ( hasWidthArg && !*haveWidth ) *width = cf2_stack_getReal( opStack, 0 ) + cf2_getNominalWidthX( font->decoder ); if ( font->decoder->width_only ) goto exit; for ( i = hasWidthArg ? 1 : 0; i < count; i += 2 ) { /* construct a CF2_StemHint and push it onto the list */ CF2_StemHintRec stemhint; stemhint.min = position += cf2_stack_getReal( opStack, i ); stemhint.max = position += cf2_stack_getReal( opStack, i + 1 ); stemhint.used = FALSE; stemhint.maxDS = stemhint.minDS = 0; cf2_arrstack_push( stemHintArray, &stemhint ); /* defer error check */ } cf2_stack_clear( opStack ); exit: /* cf2_doStems must define a width (may be default) */ *haveWidth = TRUE; } static void cf2_doFlex( CF2_Stack opStack, CF2_Fixed* curX, CF2_Fixed* curY, CF2_GlyphPath glyphPath, const FT_Bool* readFromStack, FT_Bool doConditionalLastRead ) { CF2_Fixed vals[14]; CF2_UInt index; FT_Bool isHFlex; CF2_Int top, i, j; vals[0] = *curX; vals[1] = *curY; index = 0; isHFlex = readFromStack[9] == FALSE; top = isHFlex ? 9 : 10; for ( i = 0; i < top; i++ ) { vals[i + 2] = vals[i]; if ( readFromStack[i] ) vals[i + 2] += cf2_stack_getReal( opStack, index++ ); } if ( isHFlex ) vals[9 + 2] = *curY; if ( doConditionalLastRead ) { FT_Bool lastIsX = (FT_Bool)( cf2_fixedAbs( vals[10] - *curX ) > cf2_fixedAbs( vals[11] - *curY ) ); CF2_Fixed lastVal = cf2_stack_getReal( opStack, index ); if ( lastIsX ) { vals[12] = vals[10] + lastVal; vals[13] = *curY; } else { vals[12] = *curX; vals[13] = vals[11] + lastVal; } } else { if ( readFromStack[10] ) vals[12] = vals[10] + cf2_stack_getReal( opStack, index++ ); else vals[12] = *curX; if ( readFromStack[11] ) vals[13] = vals[11] + cf2_stack_getReal( opStack, index ); else vals[13] = *curY; } for ( j = 0; j < 2; j++ ) cf2_glyphpath_curveTo( glyphPath, vals[j * 6 + 2], vals[j * 6 + 3], vals[j * 6 + 4], vals[j * 6 + 5], vals[j * 6 + 6], vals[j * 6 + 7] ); cf2_stack_clear( opStack ); *curX = vals[12]; *curY = vals[13]; } /* * `error' is a shared error code used by many objects in this * routine. Before the code continues from an error, it must check and * record the error in `*error'. The idea is that this shared * error code will record the first error encountered. If testing * for an error anyway, the cost of `goto exit' is small, so we do it, * even if continuing would be safe. In this case, `lastError' is * set, so the testing and storing can be done in one place, at `exit'. * * Continuing after an error is intended for objects which do their own * testing of `*error', e.g., array stack functions. This allows us to * avoid an extra test after the call. * * Unimplemented opcodes are ignored. * */ FT_LOCAL_DEF( void ) cf2_interpT2CharString( CF2_Font font, CF2_Buffer buf, CF2_OutlineCallbacks callbacks, const FT_Vector* translation, FT_Bool doingSeac, CF2_Fixed curX, CF2_Fixed curY, CF2_Fixed* width ) { /* lastError is used for errors that are immediately tested */ FT_Error lastError = FT_Err_Ok; /* pointer to parsed font object */ CFF_Decoder* decoder = font->decoder; FT_Error* error = &font->error; FT_Memory memory = font->memory; CF2_Fixed scaleY = font->innerTransform.d; CF2_Fixed nominalWidthX = cf2_getNominalWidthX( decoder ); /* save this for hinting seac accents */ CF2_Fixed hintOriginY = curY; CF2_Stack opStack = NULL; FT_Byte op1; /* first opcode byte */ CF2_F16Dot16 storage[CF2_STORAGE_SIZE]; /* for `put' and `get' */ /* instruction limit; 20,000,000 matches Avalon */ FT_UInt32 instructionLimit = 20000000UL; CF2_ArrStackRec subrStack; FT_Bool haveWidth; CF2_Buffer charstring = NULL; CF2_Int charstringIndex = -1; /* initialize to empty */ /* TODO: placeholders for hint structures */ /* objects used for hinting */ CF2_ArrStackRec hStemHintArray; CF2_ArrStackRec vStemHintArray; CF2_HintMaskRec hintMask; CF2_GlyphPathRec glyphPath; /* initialize the remaining objects */ cf2_arrstack_init( &subrStack, memory, error, sizeof ( CF2_BufferRec ) ); cf2_arrstack_init( &hStemHintArray, memory, error, sizeof ( CF2_StemHintRec ) ); cf2_arrstack_init( &vStemHintArray, memory, error, sizeof ( CF2_StemHintRec ) ); /* initialize CF2_StemHint arrays */ cf2_hintmask_init( &hintMask, error ); /* initialize path map to manage drawing operations */ /* Note: last 4 params are used to handle `MoveToPermissive', which */ /* may need to call `hintMap.Build' */ /* TODO: MoveToPermissive is gone; are these still needed? */ cf2_glyphpath_init( &glyphPath, font, callbacks, scaleY, /* hShift, */ &hStemHintArray, &vStemHintArray, &hintMask, hintOriginY, &font->blues, translation ); /* * Initialize state for width parsing. From the CFF Spec: * * The first stack-clearing operator, which must be one of hstem, * hstemhm, vstem, vstemhm, cntrmask, hintmask, hmoveto, vmoveto, * rmoveto, or endchar, takes an additional argument - the width (as * described earlier), which may be expressed as zero or one numeric * argument. * * What we implement here uses the first validly specified width, but * does not detect errors for specifying more than one width. * * If one of the above operators occurs without explicitly specifying * a width, we assume the default width. * */ haveWidth = FALSE; *width = cf2_getDefaultWidthX( decoder ); /* * Note: at this point, all pointers to resources must be NULL * and all local objects must be initialized. * There must be no branches to exit: above this point. * */ /* allocate an operand stack */ opStack = cf2_stack_init( memory, error ); if ( !opStack ) { lastError = FT_THROW( Out_Of_Memory ); goto exit; } /* initialize subroutine stack by placing top level charstring as */ /* first element (max depth plus one for the charstring) */ /* Note: Caller owns and must finalize the first charstring. */ /* Our copy of it does not change that requirement. */ cf2_arrstack_setCount( &subrStack, CF2_MAX_SUBR + 1 ); charstring = (CF2_Buffer)cf2_arrstack_getBuffer( &subrStack ); *charstring = *buf; /* structure copy */ charstringIndex = 0; /* entry is valid now */ /* catch errors so far */ if ( *error ) goto exit; /* main interpreter loop */ while ( 1 ) { if ( cf2_buf_isEnd( charstring ) ) { /* If we've reached the end of the charstring, simulate a */ /* cf2_cmdRETURN or cf2_cmdENDCHAR. */ if ( charstringIndex ) op1 = cf2_cmdRETURN; /* end of buffer for subroutine */ else op1 = cf2_cmdENDCHAR; /* end of buffer for top level charstring */ } else op1 = (FT_Byte)cf2_buf_readByte( charstring ); /* check for errors once per loop */ if ( *error ) goto exit; instructionLimit--; if ( instructionLimit == 0 ) { lastError = FT_THROW( Invalid_Glyph_Format ); goto exit; } switch( op1 ) { case cf2_cmdRESERVED_0: case cf2_cmdRESERVED_2: case cf2_cmdRESERVED_9: case cf2_cmdRESERVED_13: case cf2_cmdRESERVED_15: case cf2_cmdRESERVED_16: case cf2_cmdRESERVED_17: /* we may get here if we have a prior error */ FT_TRACE4(( " unknown op (%d)\n", op1 )); break; case cf2_cmdHSTEMHM: case cf2_cmdHSTEM: FT_TRACE4(( op1 == cf2_cmdHSTEMHM ? " hstemhm\n" : " hstem\n" )); /* never add hints after the mask is computed */ if ( cf2_hintmask_isValid( &hintMask ) ) { FT_TRACE4(( "cf2_interpT2CharString:" " invalid horizontal hint mask\n" )); break; } cf2_doStems( font, opStack, &hStemHintArray, width, &haveWidth, 0 ); if ( font->decoder->width_only ) goto exit; break; case cf2_cmdVSTEMHM: case cf2_cmdVSTEM: FT_TRACE4(( op1 == cf2_cmdVSTEMHM ? " vstemhm\n" : " vstem\n" )); /* never add hints after the mask is computed */ if ( cf2_hintmask_isValid( &hintMask ) ) { FT_TRACE4(( "cf2_interpT2CharString:" " invalid vertical hint mask\n" )); break; } cf2_doStems( font, opStack, &vStemHintArray, width, &haveWidth, 0 ); if ( font->decoder->width_only ) goto exit; break; case cf2_cmdVMOVETO: FT_TRACE4(( " vmoveto\n" )); if ( cf2_stack_count( opStack ) > 1 && !haveWidth ) *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX; /* width is defined or default after this */ haveWidth = TRUE; if ( font->decoder->width_only ) goto exit; curY += cf2_stack_popFixed( opStack ); cf2_glyphpath_moveTo( &glyphPath, curX, curY ); break; case cf2_cmdRLINETO: { CF2_UInt index; CF2_UInt count = cf2_stack_count( opStack ); FT_TRACE4(( " rlineto\n" )); for ( index = 0; index < count; index += 2 ) { curX += cf2_stack_getReal( opStack, index + 0 ); curY += cf2_stack_getReal( opStack, index + 1 ); cf2_glyphpath_lineTo( &glyphPath, curX, curY ); } cf2_stack_clear( opStack ); } continue; /* no need to clear stack again */ case cf2_cmdHLINETO: case cf2_cmdVLINETO: { CF2_UInt index; CF2_UInt count = cf2_stack_count( opStack ); FT_Bool isX = op1 == cf2_cmdHLINETO; FT_TRACE4(( isX ? " hlineto\n" : " vlineto\n" )); for ( index = 0; index < count; index++ ) { CF2_Fixed v = cf2_stack_getReal( opStack, index ); if ( isX ) curX += v; else curY += v; isX = !isX; cf2_glyphpath_lineTo( &glyphPath, curX, curY ); } cf2_stack_clear( opStack ); } continue; case cf2_cmdRCURVELINE: case cf2_cmdRRCURVETO: { CF2_UInt count = cf2_stack_count( opStack ); CF2_UInt index = 0; FT_TRACE4(( op1 == cf2_cmdRCURVELINE ? " rcurveline\n" : " rrcurveto\n" )); while ( index + 6 <= count ) { CF2_Fixed x1 = cf2_stack_getReal( opStack, index + 0 ) + curX; CF2_Fixed y1 = cf2_stack_getReal( opStack, index + 1 ) + curY; CF2_Fixed x2 = cf2_stack_getReal( opStack, index + 2 ) + x1; CF2_Fixed y2 = cf2_stack_getReal( opStack, index + 3 ) + y1; CF2_Fixed x3 = cf2_stack_getReal( opStack, index + 4 ) + x2; CF2_Fixed y3 = cf2_stack_getReal( opStack, index + 5 ) + y2; cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 ); curX = x3; curY = y3; index += 6; } if ( op1 == cf2_cmdRCURVELINE ) { curX += cf2_stack_getReal( opStack, index + 0 ); curY += cf2_stack_getReal( opStack, index + 1 ); cf2_glyphpath_lineTo( &glyphPath, curX, curY ); } cf2_stack_clear( opStack ); } continue; /* no need to clear stack again */ case cf2_cmdCALLGSUBR: case cf2_cmdCALLSUBR: { CF2_Int subrNum; FT_TRACE4(( op1 == cf2_cmdCALLGSUBR ? " callgsubr" : " callsubr" )); if ( charstringIndex > CF2_MAX_SUBR ) { /* max subr plus one for charstring */ lastError = FT_THROW( Invalid_Glyph_Format ); goto exit; /* overflow of stack */ } /* push our current CFF charstring region on subrStack */ charstring = (CF2_Buffer) cf2_arrstack_getPointer( &subrStack, (size_t)charstringIndex + 1 ); /* set up the new CFF region and pointer */ subrNum = cf2_stack_popInt( opStack ); switch ( op1 ) { case cf2_cmdCALLGSUBR: FT_TRACE4(( " (idx %d, entering level %d)\n", subrNum + decoder->globals_bias, charstringIndex + 1 )); if ( cf2_initGlobalRegionBuffer( decoder, subrNum, charstring ) ) { lastError = FT_THROW( Invalid_Glyph_Format ); goto exit; /* subroutine lookup or stream error */ } break; default: /* cf2_cmdCALLSUBR */ FT_TRACE4(( " (idx %d, entering level %d)\n", subrNum + decoder->locals_bias, charstringIndex + 1 )); if ( cf2_initLocalRegionBuffer( decoder, subrNum, charstring ) ) { lastError = FT_THROW( Invalid_Glyph_Format ); goto exit; /* subroutine lookup or stream error */ } } charstringIndex += 1; /* entry is valid now */ } continue; /* do not clear the stack */ case cf2_cmdRETURN: FT_TRACE4(( " return (leaving level %d)\n", charstringIndex )); if ( charstringIndex < 1 ) { /* Note: cannot return from top charstring */ lastError = FT_THROW( Invalid_Glyph_Format ); goto exit; /* underflow of stack */ } /* restore position in previous charstring */ charstring = (CF2_Buffer) cf2_arrstack_getPointer( &subrStack, (CF2_UInt)--charstringIndex ); continue; /* do not clear the stack */ case cf2_cmdESC: { FT_Byte op2 = (FT_Byte)cf2_buf_readByte( charstring ); switch ( op2 ) { case cf2_escDOTSECTION: /* something about `flip type of locking' -- ignore it */ FT_TRACE4(( " dotsection\n" )); break; case cf2_escAND: { CF2_F16Dot16 arg1; CF2_F16Dot16 arg2; FT_TRACE4(( " and\n" )); arg2 = cf2_stack_popFixed( opStack ); arg1 = cf2_stack_popFixed( opStack ); cf2_stack_pushInt( opStack, arg1 && arg2 ); } continue; /* do not clear the stack */ case cf2_escOR: { CF2_F16Dot16 arg1; CF2_F16Dot16 arg2; FT_TRACE4(( " or\n" )); arg2 = cf2_stack_popFixed( opStack ); arg1 = cf2_stack_popFixed( opStack ); cf2_stack_pushInt( opStack, arg1 || arg2 ); } continue; /* do not clear the stack */ case cf2_escNOT: { CF2_F16Dot16 arg; FT_TRACE4(( " not\n" )); arg = cf2_stack_popFixed( opStack ); cf2_stack_pushInt( opStack, !arg ); } continue; /* do not clear the stack */ case cf2_escABS: { CF2_F16Dot16 arg; FT_TRACE4(( " abs\n" )); arg = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, FT_ABS( arg ) ); } continue; /* do not clear the stack */ case cf2_escADD: { CF2_F16Dot16 summand1; CF2_F16Dot16 summand2; FT_TRACE4(( " add\n" )); summand2 = cf2_stack_popFixed( opStack ); summand1 = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, summand1 + summand2 ); } continue; /* do not clear the stack */ case cf2_escSUB: { CF2_F16Dot16 minuend; CF2_F16Dot16 subtrahend; FT_TRACE4(( " sub\n" )); subtrahend = cf2_stack_popFixed( opStack ); minuend = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, minuend - subtrahend ); } continue; /* do not clear the stack */ case cf2_escDIV: { CF2_F16Dot16 dividend; CF2_F16Dot16 divisor; FT_TRACE4(( " div\n" )); divisor = cf2_stack_popFixed( opStack ); dividend = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, FT_DivFix( dividend, divisor ) ); } continue; /* do not clear the stack */ case cf2_escNEG: { CF2_F16Dot16 arg; FT_TRACE4(( " neg\n" )); arg = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, -arg ); } continue; /* do not clear the stack */ case cf2_escEQ: { CF2_F16Dot16 arg1; CF2_F16Dot16 arg2; FT_TRACE4(( " eq\n" )); arg2 = cf2_stack_popFixed( opStack ); arg1 = cf2_stack_popFixed( opStack ); cf2_stack_pushInt( opStack, arg1 == arg2 ); } continue; /* do not clear the stack */ case cf2_escDROP: FT_TRACE4(( " drop\n" )); (void)cf2_stack_popFixed( opStack ); continue; /* do not clear the stack */ case cf2_escPUT: { CF2_F16Dot16 val; CF2_Int idx; FT_TRACE4(( " put\n" )); idx = cf2_stack_popInt( opStack ); val = cf2_stack_popFixed( opStack ); if ( idx >= 0 && idx < CF2_STORAGE_SIZE ) storage[idx] = val; } continue; /* do not clear the stack */ case cf2_escGET: { CF2_Int idx; FT_TRACE4(( " get\n" )); idx = cf2_stack_popInt( opStack ); if ( idx >= 0 && idx < CF2_STORAGE_SIZE ) cf2_stack_pushFixed( opStack, storage[idx] ); } continue; /* do not clear the stack */ case cf2_escIFELSE: { CF2_F16Dot16 arg1; CF2_F16Dot16 arg2; CF2_F16Dot16 cond1; CF2_F16Dot16 cond2; FT_TRACE4(( " ifelse\n" )); cond2 = cf2_stack_popFixed( opStack ); cond1 = cf2_stack_popFixed( opStack ); arg2 = cf2_stack_popFixed( opStack ); arg1 = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, cond1 <= cond2 ? arg1 : arg2 ); } continue; /* do not clear the stack */ case cf2_escRANDOM: /* in spec */ FT_TRACE4(( " random\n" )); CF2_FIXME; break; case cf2_escMUL: { CF2_F16Dot16 factor1; CF2_F16Dot16 factor2; FT_TRACE4(( " mul\n" )); factor2 = cf2_stack_popFixed( opStack ); factor1 = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, FT_MulFix( factor1, factor2 ) ); } continue; /* do not clear the stack */ case cf2_escSQRT: { CF2_F16Dot16 arg; FT_TRACE4(( " sqrt\n" )); arg = cf2_stack_popFixed( opStack ); if ( arg > 0 ) { FT_Fixed root = arg; FT_Fixed new_root; /* Babylonian method */ for (;;) { new_root = ( root + FT_DivFix( arg, root ) + 1 ) >> 1; if ( new_root == root ) break; root = new_root; } arg = new_root; } else arg = 0; cf2_stack_pushFixed( opStack, arg ); } continue; /* do not clear the stack */ case cf2_escDUP: { CF2_F16Dot16 arg; FT_TRACE4(( " dup\n" )); arg = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, arg ); cf2_stack_pushFixed( opStack, arg ); } continue; /* do not clear the stack */ case cf2_escEXCH: { CF2_F16Dot16 arg1; CF2_F16Dot16 arg2; FT_TRACE4(( " exch\n" )); arg2 = cf2_stack_popFixed( opStack ); arg1 = cf2_stack_popFixed( opStack ); cf2_stack_pushFixed( opStack, arg2 ); cf2_stack_pushFixed( opStack, arg1 ); } continue; /* do not clear the stack */ case cf2_escINDEX: { CF2_Int idx; CF2_UInt size; FT_TRACE4(( " index\n" )); idx = cf2_stack_popInt( opStack ); size = cf2_stack_count( opStack ); if ( size > 0 ) { /* for `cf2_stack_getReal', index 0 is bottom of stack */ CF2_UInt gr_idx; if ( idx < 0 ) gr_idx = size - 1; else if ( (CF2_UInt)idx >= size ) gr_idx = 0; else gr_idx = size - 1 - (CF2_UInt)idx; cf2_stack_pushFixed( opStack, cf2_stack_getReal( opStack, gr_idx ) ); } } continue; /* do not clear the stack */ case cf2_escROLL: { CF2_Int idx; CF2_Int count; FT_TRACE4(( " roll\n" )); idx = cf2_stack_popInt( opStack ); count = cf2_stack_popInt( opStack ); cf2_stack_roll( opStack, count, idx ); } continue; /* do not clear the stack */ case cf2_escHFLEX: { static const FT_Bool readFromStack[12] = { TRUE /* dx1 */, FALSE /* dy1 */, TRUE /* dx2 */, TRUE /* dy2 */, TRUE /* dx3 */, FALSE /* dy3 */, TRUE /* dx4 */, FALSE /* dy4 */, TRUE /* dx5 */, FALSE /* dy5 */, TRUE /* dx6 */, FALSE /* dy6 */ }; FT_TRACE4(( " hflex\n" )); cf2_doFlex( opStack, &curX, &curY, &glyphPath, readFromStack, FALSE /* doConditionalLastRead */ ); } continue; case cf2_escFLEX: { static const FT_Bool readFromStack[12] = { TRUE /* dx1 */, TRUE /* dy1 */, TRUE /* dx2 */, TRUE /* dy2 */, TRUE /* dx3 */, TRUE /* dy3 */, TRUE /* dx4 */, TRUE /* dy4 */, TRUE /* dx5 */, TRUE /* dy5 */, TRUE /* dx6 */, TRUE /* dy6 */ }; FT_TRACE4(( " flex\n" )); cf2_doFlex( opStack, &curX, &curY, &glyphPath, readFromStack, FALSE /* doConditionalLastRead */ ); } break; /* TODO: why is this not a continue? */ case cf2_escHFLEX1: { static const FT_Bool readFromStack[12] = { TRUE /* dx1 */, TRUE /* dy1 */, TRUE /* dx2 */, TRUE /* dy2 */, TRUE /* dx3 */, FALSE /* dy3 */, TRUE /* dx4 */, FALSE /* dy4 */, TRUE /* dx5 */, TRUE /* dy5 */, TRUE /* dx6 */, FALSE /* dy6 */ }; FT_TRACE4(( " hflex1\n" )); cf2_doFlex( opStack, &curX, &curY, &glyphPath, readFromStack, FALSE /* doConditionalLastRead */ ); } continue; case cf2_escFLEX1: { static const FT_Bool readFromStack[12] = { TRUE /* dx1 */, TRUE /* dy1 */, TRUE /* dx2 */, TRUE /* dy2 */, TRUE /* dx3 */, TRUE /* dy3 */, TRUE /* dx4 */, TRUE /* dy4 */, TRUE /* dx5 */, TRUE /* dy5 */, FALSE /* dx6 */, FALSE /* dy6 */ }; FT_TRACE4(( " flex1\n" )); cf2_doFlex( opStack, &curX, &curY, &glyphPath, readFromStack, TRUE /* doConditionalLastRead */ ); } continue; case cf2_escRESERVED_1: case cf2_escRESERVED_2: case cf2_escRESERVED_6: case cf2_escRESERVED_7: case cf2_escRESERVED_8: case cf2_escRESERVED_13: case cf2_escRESERVED_16: case cf2_escRESERVED_17: case cf2_escRESERVED_19: case cf2_escRESERVED_25: case cf2_escRESERVED_31: case cf2_escRESERVED_32: case cf2_escRESERVED_33: default: FT_TRACE4(( " unknown op (12, %d)\n", op2 )); }; /* end of switch statement checking `op2' */ } /* case cf2_cmdESC */ break; case cf2_cmdENDCHAR: FT_TRACE4(( " endchar\n" )); if ( cf2_stack_count( opStack ) == 1 || cf2_stack_count( opStack ) == 5 ) { if ( !haveWidth ) *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX; } /* width is defined or default after this */ haveWidth = TRUE; if ( font->decoder->width_only ) goto exit; /* close path if still open */ cf2_glyphpath_closeOpenPath( &glyphPath ); if ( cf2_stack_count( opStack ) > 1 ) { /* must be either 4 or 5 -- */ /* this is a (deprecated) implied `seac' operator */ CF2_Int achar; CF2_Int bchar; CF2_BufferRec component; CF2_Fixed dummyWidth; /* ignore component width */ FT_Error error2; if ( doingSeac ) { lastError = FT_THROW( Invalid_Glyph_Format ); goto exit; /* nested seac */ } achar = cf2_stack_popInt( opStack ); bchar = cf2_stack_popInt( opStack ); curY = cf2_stack_popFixed( opStack ); curX = cf2_stack_popFixed( opStack ); error2 = cf2_getSeacComponent( decoder, achar, &component ); if ( error2 ) { lastError = error2; /* pass FreeType error through */ goto exit; } cf2_interpT2CharString( font, &component, callbacks, translation, TRUE, curX, curY, &dummyWidth ); cf2_freeSeacComponent( decoder, &component ); error2 = cf2_getSeacComponent( decoder, bchar, &component ); if ( error2 ) { lastError = error2; /* pass FreeType error through */ goto exit; } cf2_interpT2CharString( font, &component, callbacks, translation, TRUE, 0, 0, &dummyWidth ); cf2_freeSeacComponent( decoder, &component ); } goto exit; case cf2_cmdCNTRMASK: case cf2_cmdHINTMASK: /* the final \n in the tracing message gets added in */ /* `cf2_hintmask_read' (which also traces the mask bytes) */ FT_TRACE4(( op1 == cf2_cmdCNTRMASK ? " cntrmask" : " hintmask" )); /* never add hints after the mask is computed */ if ( cf2_stack_count( opStack ) > 1 && cf2_hintmask_isValid( &hintMask ) ) { FT_TRACE4(( "cf2_interpT2CharString: invalid hint mask\n" )); break; } /* if there are arguments on the stack, there this is an */ /* implied cf2_cmdVSTEMHM */ cf2_doStems( font, opStack, &vStemHintArray, width, &haveWidth, 0 ); if ( font->decoder->width_only ) goto exit; if ( op1 == cf2_cmdHINTMASK ) { /* consume the hint mask bytes which follow the operator */ cf2_hintmask_read( &hintMask, charstring, cf2_arrstack_size( &hStemHintArray ) + cf2_arrstack_size( &vStemHintArray ) ); } else { /* * Consume the counter mask bytes which follow the operator: * Build a temporary hint map, just to place and lock those * stems participating in the counter mask. These are most * likely the dominant hstems, and are grouped together in a * few counter groups, not necessarily in correspondence * with the hint groups. This reduces the chances of * conflicts between hstems that are initially placed in * separate hint groups and then brought together. The * positions are copied back to `hStemHintArray', so we can * discard `counterMask' and `counterHintMap'. * */ CF2_HintMapRec counterHintMap; CF2_HintMaskRec counterMask; cf2_hintmap_init( &counterHintMap, font, &glyphPath.initialHintMap, &glyphPath.hintMoves, scaleY ); cf2_hintmask_init( &counterMask, error ); cf2_hintmask_read( &counterMask, charstring, cf2_arrstack_size( &hStemHintArray ) + cf2_arrstack_size( &vStemHintArray ) ); cf2_hintmap_build( &counterHintMap, &hStemHintArray, &vStemHintArray, &counterMask, 0, FALSE ); } break; case cf2_cmdRMOVETO: FT_TRACE4(( " rmoveto\n" )); if ( cf2_stack_count( opStack ) > 2 && !haveWidth ) *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX; /* width is defined or default after this */ haveWidth = TRUE; if ( font->decoder->width_only ) goto exit; curY += cf2_stack_popFixed( opStack ); curX += cf2_stack_popFixed( opStack ); cf2_glyphpath_moveTo( &glyphPath, curX, curY ); break; case cf2_cmdHMOVETO: FT_TRACE4(( " hmoveto\n" )); if ( cf2_stack_count( opStack ) > 1 && !haveWidth ) *width = cf2_stack_getReal( opStack, 0 ) + nominalWidthX; /* width is defined or default after this */ haveWidth = TRUE; if ( font->decoder->width_only ) goto exit; curX += cf2_stack_popFixed( opStack ); cf2_glyphpath_moveTo( &glyphPath, curX, curY ); break; case cf2_cmdRLINECURVE: { CF2_UInt count = cf2_stack_count( opStack ); CF2_UInt index = 0; FT_TRACE4(( " rlinecurve\n" )); while ( index + 6 < count ) { curX += cf2_stack_getReal( opStack, index + 0 ); curY += cf2_stack_getReal( opStack, index + 1 ); cf2_glyphpath_lineTo( &glyphPath, curX, curY ); index += 2; } while ( index < count ) { CF2_Fixed x1 = cf2_stack_getReal( opStack, index + 0 ) + curX; CF2_Fixed y1 = cf2_stack_getReal( opStack, index + 1 ) + curY; CF2_Fixed x2 = cf2_stack_getReal( opStack, index + 2 ) + x1; CF2_Fixed y2 = cf2_stack_getReal( opStack, index + 3 ) + y1; CF2_Fixed x3 = cf2_stack_getReal( opStack, index + 4 ) + x2; CF2_Fixed y3 = cf2_stack_getReal( opStack, index + 5 ) + y2; cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 ); curX = x3; curY = y3; index += 6; } cf2_stack_clear( opStack ); } continue; /* no need to clear stack again */ case cf2_cmdVVCURVETO: { CF2_UInt count, count1 = cf2_stack_count( opStack ); CF2_UInt index = 0; /* if `cf2_stack_count' isn't of the form 4n or 4n+1, */ /* we enforce it by clearing the second bit */ /* (and sorting the stack indexing to suit) */ count = count1 & ~2U; index += count1 - count; FT_TRACE4(( " vvcurveto\n" )); while ( index < count ) { CF2_Fixed x1, y1, x2, y2, x3, y3; if ( ( count - index ) & 1 ) { x1 = cf2_stack_getReal( opStack, index ) + curX; ++index; } else x1 = curX; y1 = cf2_stack_getReal( opStack, index + 0 ) + curY; x2 = cf2_stack_getReal( opStack, index + 1 ) + x1; y2 = cf2_stack_getReal( opStack, index + 2 ) + y1; x3 = x2; y3 = cf2_stack_getReal( opStack, index + 3 ) + y2; cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 ); curX = x3; curY = y3; index += 4; } cf2_stack_clear( opStack ); } continue; /* no need to clear stack again */ case cf2_cmdHHCURVETO: { CF2_UInt count, count1 = cf2_stack_count( opStack ); CF2_UInt index = 0; /* if `cf2_stack_count' isn't of the form 4n or 4n+1, */ /* we enforce it by clearing the second bit */ /* (and sorting the stack indexing to suit) */ count = count1 & ~2U; index += count1 - count; FT_TRACE4(( " hhcurveto\n" )); while ( index < count ) { CF2_Fixed x1, y1, x2, y2, x3, y3; if ( ( count - index ) & 1 ) { y1 = cf2_stack_getReal( opStack, index ) + curY; ++index; } else y1 = curY; x1 = cf2_stack_getReal( opStack, index + 0 ) + curX; x2 = cf2_stack_getReal( opStack, index + 1 ) + x1; y2 = cf2_stack_getReal( opStack, index + 2 ) + y1; x3 = cf2_stack_getReal( opStack, index + 3 ) + x2; y3 = y2; cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 ); curX = x3; curY = y3; index += 4; } cf2_stack_clear( opStack ); } continue; /* no need to clear stack again */ case cf2_cmdVHCURVETO: case cf2_cmdHVCURVETO: { CF2_UInt count, count1 = cf2_stack_count( opStack ); CF2_UInt index = 0; FT_Bool alternate = op1 == cf2_cmdHVCURVETO; /* if `cf2_stack_count' isn't of the form 8n, 8n+1, */ /* 8n+4, or 8n+5, we enforce it by clearing the */ /* second bit */ /* (and sorting the stack indexing to suit) */ count = count1 & ~2U; index += count1 - count; FT_TRACE4(( alternate ? " hvcurveto\n" : " vhcurveto\n" )); while ( index < count ) { CF2_Fixed x1, x2, x3, y1, y2, y3; if ( alternate ) { x1 = cf2_stack_getReal( opStack, index + 0 ) + curX; y1 = curY; x2 = cf2_stack_getReal( opStack, index + 1 ) + x1; y2 = cf2_stack_getReal( opStack, index + 2 ) + y1; y3 = cf2_stack_getReal( opStack, index + 3 ) + y2; if ( count - index == 5 ) { x3 = cf2_stack_getReal( opStack, index + 4 ) + x2; ++index; } else x3 = x2; alternate = FALSE; } else { x1 = curX; y1 = cf2_stack_getReal( opStack, index + 0 ) + curY; x2 = cf2_stack_getReal( opStack, index + 1 ) + x1; y2 = cf2_stack_getReal( opStack, index + 2 ) + y1; x3 = cf2_stack_getReal( opStack, index + 3 ) + x2; if ( count - index == 5 ) { y3 = cf2_stack_getReal( opStack, index + 4 ) + y2; ++index; } else y3 = y2; alternate = TRUE; } cf2_glyphpath_curveTo( &glyphPath, x1, y1, x2, y2, x3, y3 ); curX = x3; curY = y3; index += 4; } cf2_stack_clear( opStack ); } continue; /* no need to clear stack again */ case cf2_cmdEXTENDEDNMBR: { CF2_Int v; CF2_Int byte1 = cf2_buf_readByte( charstring ); CF2_Int byte2 = cf2_buf_readByte( charstring ); v = (FT_Short)( ( byte1 << 8 ) | byte2 ); FT_TRACE4(( " %d", v )); cf2_stack_pushInt( opStack, v ); } continue; default: /* numbers */ { if ( /* op1 >= 32 && */ op1 <= 246 ) { CF2_Int v; v = op1 - 139; FT_TRACE4(( " %d", v )); /* -107 .. 107 */ cf2_stack_pushInt( opStack, v ); } else if ( /* op1 >= 247 && */ op1 <= 250 ) { CF2_Int v; v = op1; v -= 247; v *= 256; v += cf2_buf_readByte( charstring ); v += 108; FT_TRACE4(( " %d", v )); /* 108 .. 1131 */ cf2_stack_pushInt( opStack, v ); } else if ( /* op1 >= 251 && */ op1 <= 254 ) { CF2_Int v; v = op1; v -= 251; v *= 256; v += cf2_buf_readByte( charstring ); v = -v - 108; FT_TRACE4(( " %d", v )); /* -1131 .. -108 */ cf2_stack_pushInt( opStack, v ); } else /* op1 == 255 */ { CF2_Fixed v; FT_UInt32 byte1 = (FT_UInt32)cf2_buf_readByte( charstring ); FT_UInt32 byte2 = (FT_UInt32)cf2_buf_readByte( charstring ); FT_UInt32 byte3 = (FT_UInt32)cf2_buf_readByte( charstring ); FT_UInt32 byte4 = (FT_UInt32)cf2_buf_readByte( charstring ); v = (CF2_Fixed)( ( byte1 << 24 ) | ( byte2 << 16 ) | ( byte3 << 8 ) | byte4 ); FT_TRACE4(( " %.2f", v / 65536.0 )); cf2_stack_pushFixed( opStack, v ); } } continue; /* don't clear stack */ } /* end of switch statement checking `op1' */ cf2_stack_clear( opStack ); } /* end of main interpreter loop */ /* we get here if the charstring ends without cf2_cmdENDCHAR */ FT_TRACE4(( "cf2_interpT2CharString:" " charstring ends without ENDCHAR\n" )); exit: /* check whether last error seen is also the first one */ cf2_setError( error, lastError ); /* free resources from objects we've used */ cf2_glyphpath_finalize( &glyphPath ); cf2_arrstack_finalize( &vStemHintArray ); cf2_arrstack_finalize( &hStemHintArray ); cf2_arrstack_finalize( &subrStack ); cf2_stack_free( opStack ); FT_TRACE4(( "\n" )); return; } /* END */