1 /***************************************************************************/ 2 /* */ 3 /* ftcalc.h */ 4 /* */ 5 /* Arithmetic computations (specification). */ 6 /* */ 7 /* Copyright 1996-2001, 2002 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #ifndef __FTCALC_H__ 20 #define __FTCALC_H__ 21 22 23 #include <ft2build.h> 24 #include FT_FREETYPE_H 25 26 27 FT_BEGIN_HEADER 28 29 30 FT_EXPORT( FT_Int32 ) FT_SqrtFixed( FT_Int32 x ); 31 32 33 #define SQRT_32( x ) FT_Sqrt32( x ) 34 35 36 /*************************************************************************/ 37 /* */ 38 /* <Function> */ 39 /* FT_Sqrt32 */ 40 /* */ 41 /* <Description> */ 42 /* Computes the square root of an Int32 integer (which will be */ 43 /* handled as an unsigned long value). */ 44 /* */ 45 /* <Input> */ 46 /* x :: The value to compute the root for. */ 47 /* */ 48 /* <Return> */ 49 /* The result of `sqrt(x)'. */ 50 /* */ 51 FT_EXPORT( FT_Int32 ) 52 FT_Sqrt32( FT_Int32 x ); 53 54 55 /*************************************************************************/ 56 /* */ 57 /* FT_MulDiv() and FT_MulFix() are declared in freetype.h. */ 58 /* */ 59 /*************************************************************************/ 60 61 62 #define INT_TO_F26DOT6( x ) ( (FT_Long)(x) << 6 ) 63 #define INT_TO_F2DOT14( x ) ( (FT_Long)(x) << 14 ) 64 #define INT_TO_FIXED( x ) ( (FT_Long)(x) << 16 ) 65 #define F2DOT14_TO_FIXED( x ) ( (FT_Long)(x) << 2 ) 66 #define FLOAT_TO_FIXED( x ) ( (FT_Long)( x * 65536.0 ) ) 67 68 #define ROUND_F26DOT6( x ) ( x >= 0 ? ( ( (x) + 32 ) & -64 ) \ 69 : ( -( ( 32 - (x) ) & -64 ) ) ) 70 71 72 FT_END_HEADER 73 74 #endif /* __FTCALC_H__ */ 75 76 77 /* END */ 78