224 lines
11 KiB
C
224 lines
11 KiB
C
/***************************************************************************/
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/* */
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/* ftcalc.h */
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/* */
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/* Arithmetic computations (specification). */
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/* */
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/* Copyright 1996-2000 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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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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/***************************************************************************/
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#ifndef __FTCALC_H__
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#define __FTCALC_H__
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#include <ft2build.h>
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#include FT_FREETYPE_H
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FT_BEGIN_HEADER
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/* OLD 64-bits internal API */
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#ifdef FT_CONFIG_OPTION_OLD_CALCS
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#ifdef FT_LONG64
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typedef FT_INT64 FT_Int64;
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#define ADD_64( x, y, z ) z = (x) + (y)
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#define MUL_64( x, y, z ) z = (FT_Int64)(x) * (y)
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#define DIV_64( x, y ) ( (x) / (y) )
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#define SQRT_64( z ) FT_Sqrt64( z )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Sqrt64 */
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/* */
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/* <Description> */
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/* Computes the square root of a 64-bit value. That sounds stupid, */
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/* but it is needed to obtain maximal accuracy in the TrueType */
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/* bytecode interpreter. */
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/* */
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/* <Input> */
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/* l :: A 64-bit integer. */
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/* */
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/* <Return> */
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/* The 32-bit square-root. */
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/* */
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FT_EXPORT( FT_Int32 ) FT_Sqrt64( FT_Int64 l );
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#else /* !FT_LONG64 */
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typedef struct FT_Int64_
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{
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FT_UInt32 lo;
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FT_UInt32 hi;
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} FT_Int64;
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#define ADD_64( x, y, z ) FT_Add64( &x, &y, &z )
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#define MUL_64( x, y, z ) FT_MulTo64( x, y, &z )
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#define DIV_64( x, y ) FT_Div64by32( &x, y )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Add64 */
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/* */
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/* <Description> */
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/* Add two Int64 values. */
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/* */
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/* <Input> */
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/* x :: A pointer to the first value to be added. */
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/* y :: A pointer to the second value to be added. */
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/* */
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/* <Output> */
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/* z :: A pointer to the result of `x + y'. */
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/* */
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/* <Note> */
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/* Will be wrapped by the ADD_64() macro. */
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/* */
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FT_EXPORT( void ) FT_Add64( FT_Int64* x,
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FT_Int64* y,
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FT_Int64 *z );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_MulTo64 */
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/* */
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/* <Description> */
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/* Multiplies two Int32 integers. Returns an Int64 integer. */
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/* */
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/* <Input> */
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/* x :: The first multiplier. */
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/* y :: The second multiplier. */
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/* */
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/* <Output> */
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/* z :: A pointer to the result of `x * y'. */
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/* */
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/* <Note> */
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/* Will be wrapped by the MUL_64() macro. */
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/* */
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FT_EXPORT( void ) FT_MulTo64( FT_Int32 x,
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FT_Int32 y,
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FT_Int64 *z );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Div64by32 */
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/* */
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/* <Description> */
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/* Divides an Int64 value by an Int32 value. Returns an Int32 */
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/* integer. */
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/* */
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/* <Input> */
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/* x :: A pointer to the dividend. */
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/* y :: The divisor. */
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/* */
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/* <Return> */
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/* The result of `x / y'. */
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/* */
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/* <Note> */
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/* Will be wrapped by the DIV_64() macro. */
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/* */
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FT_EXPORT( FT_Int32 ) FT_Div64by32( FT_Int64* x,
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FT_Int32 y );
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#define SQRT_64( z ) FT_Sqrt64( &z )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Sqrt64 */
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/* */
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/* <Description> */
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/* Computes the square root of a 64-bits value. That sounds stupid, */
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/* but it is needed to obtain maximal accuracy in the TrueType */
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/* bytecode interpreter. */
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/* */
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/* <Input> */
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/* z :: A pointer to a 64-bit integer. */
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/* */
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/* <Return> */
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/* The 32-bit square-root. */
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/* */
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FT_EXPORT( FT_Int32 ) FT_Sqrt64( FT_Int64* x );
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#endif /* !FT_LONG64 */
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#endif /* FT_CONFIG_OPTION_OLD_CALCS */
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FT_EXPORT( FT_Int32 ) FT_SqrtFixed( FT_Int32 x );
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#ifndef FT_CONFIG_OPTION_OLD_CALCS
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#define SQRT_32( x ) FT_Sqrt32( x )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Sqrt32 */
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/* */
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/* <Description> */
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/* Computes the square root of an Int32 integer (which will be */
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/* handled as an unsigned long value). */
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/* */
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/* <Input> */
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/* x :: The value to compute the root for. */
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/* */
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/* <Return> */
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/* The result of `sqrt(x)'. */
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/* */
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FT_EXPORT( FT_Int32 ) FT_Sqrt32( FT_Int32 x );
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#endif /* !FT_CONFIG_OPTION_OLD_CALCS */
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/*************************************************************************/
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/* */
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/* FT_MulDiv() and FT_MulFix() are declared in freetype.h. */
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/* */
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/*************************************************************************/
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#define INT_TO_F26DOT6( x ) ( (FT_Long)(x) << 6 )
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#define INT_TO_F2DOT14( x ) ( (FT_Long)(x) << 14 )
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#define INT_TO_FIXED( x ) ( (FT_Long)(x) << 16 )
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#define F2DOT14_TO_FIXED( x ) ( (FT_Long)(x) << 2 )
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#define FLOAT_TO_FIXED( x ) ( (FT_Long)( x * 65536.0 ) )
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#define ROUND_F26DOT6( x ) ( x >= 0 ? ( ( (x) + 32 ) & -64 ) \
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: ( -( ( 32 - (x) ) & -64 ) ) )
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FT_END_HEADER
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#endif /* __FTCALC_H__ */
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/* END */
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