78 lines
3.5 KiB
C
78 lines
3.5 KiB
C
/***************************************************************************/
|
|
/* */
|
|
/* ftcalc.h */
|
|
/* */
|
|
/* Arithmetic computations (specification). */
|
|
/* */
|
|
/* Copyright 1996-2001, 2002 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. */
|
|
/* */
|
|
/***************************************************************************/
|
|
|
|
|
|
#ifndef __FTCALC_H__
|
|
#define __FTCALC_H__
|
|
|
|
|
|
#include <ft2build.h>
|
|
#include FT_FREETYPE_H
|
|
|
|
|
|
FT_BEGIN_HEADER
|
|
|
|
|
|
FT_EXPORT( FT_Int32 ) FT_SqrtFixed( FT_Int32 x );
|
|
|
|
|
|
#define SQRT_32( x ) FT_Sqrt32( x )
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Sqrt32 */
|
|
/* */
|
|
/* <Description> */
|
|
/* Computes the square root of an Int32 integer (which will be */
|
|
/* handled as an unsigned long value). */
|
|
/* */
|
|
/* <Input> */
|
|
/* x :: The value to compute the root for. */
|
|
/* */
|
|
/* <Return> */
|
|
/* The result of `sqrt(x)'. */
|
|
/* */
|
|
FT_EXPORT( FT_Int32 )
|
|
FT_Sqrt32( FT_Int32 x );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* FT_MulDiv() and FT_MulFix() are declared in freetype.h. */
|
|
/* */
|
|
/*************************************************************************/
|
|
|
|
|
|
#define INT_TO_F26DOT6( x ) ( (FT_Long)(x) << 6 )
|
|
#define INT_TO_F2DOT14( x ) ( (FT_Long)(x) << 14 )
|
|
#define INT_TO_FIXED( x ) ( (FT_Long)(x) << 16 )
|
|
#define F2DOT14_TO_FIXED( x ) ( (FT_Long)(x) << 2 )
|
|
#define FLOAT_TO_FIXED( x ) ( (FT_Long)( x * 65536.0 ) )
|
|
|
|
#define ROUND_F26DOT6( x ) ( x >= 0 ? ( ( (x) + 32 ) & -64 ) \
|
|
: ( -( ( 32 - (x) ) & -64 ) ) )
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __FTCALC_H__ */
|
|
|
|
|
|
/* END */
|