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65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
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File: FontMath.h
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Contains: xxx put contents here xxx
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Written by: xxx put writers here xxx
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Copyright: © 1990 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<4> 11/27/90 MR make pascal declaration a macro, conditionalize traps -vs-
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externs for Fix/Frac math routines. [ph]
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<3> 11/5/90 MR Move [U]SHORTMUL into FSCdefs.h Rename FixMulDiv to LongMulDiv.
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[rb]
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<2> 10/20/90 MR Add some new math routines (stolen from skia). [rj]
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<1> 4/11/90 dba first checked in
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To Do:
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*/
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#define HIBITSET 0x80000000
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#define POSINFINITY 0x7FFFFFFF
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#define NEGINFINITY 0x80000000
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#define HIWORDMASK 0xffff0000
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#define LOWORDMASK 0x0000ffff
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#define FIXONEHALF 0x00008000
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#define ONESHORTFRAC (1 << 14)
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#define FIXROUND( x ) (int16)(((x) + FIXONEHALF) >> 16)
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#define ROUNDFIXED( x ) (((x) + FIXONEHALF) & HIWORDMASK)
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#define DOT6TOFIX(n) ((n) << 10)
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#define HIWORD(n) ((uint16)((uint32)(n) >> 16))
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#define LOWORD(n) ((uint16)(n))
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#define LOWSIXBITS 63
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typedef short ShortFrac; /* 2.14 */
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#ifdef NOT_ON_THE_MAC
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PASCAL Fixed FixRatio(short numer,short denom);
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PASCAL Fixed FixMul(Fixed a,Fixed b);
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PASCAL Fixed FixDiv(Fixed x,Fixed y);
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PASCAL Fract FracMul(Fract x,Fract y);
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PASCAL Fract FracDiv(Fract x,Fract y);
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PASCAL Fract FracSqrt(Fract x);
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#else
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#ifndef __TOOLUTILS__
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PASCAL Fixed FixRatio(short numer,short denom) = 0xA869;
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PASCAL Fixed FixMul(Fixed a,Fixed b) = 0xA868;
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#endif
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#ifndef __FIXMATH__
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PASCAL Fixed FixDiv(Fixed x,Fixed y) = 0xA84D;
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PASCAL Fract FracMul(Fract x,Fract y) = 0xA84A;
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PASCAL Fract FracDiv(Fract x,Fract y) = 0xA84B;
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PASCAL Fract FracSqrt(Fract x) = 0xA849;
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#endif
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#endif
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long LongMulDiv(long a, long b, long c); /* (a*b)/c */
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long ShortFracMul(long a, ShortFrac b);
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ShortFrac ShortFracDot(ShortFrac a, ShortFrac b);
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int32 ShortMulDiv(int32 a, int16 b, int16 c); /* (a*b)/c */
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F26Dot6 Mul26Dot6(F26Dot6 a, F26Dot6 b);
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F26Dot6 Div26Dot6(F26Dot6 a, F26Dot6 b);
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