// $Id: ccmaths.cpp 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ #include "camtypes.h" //#include "fixed.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "xlong.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "ccmaths.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "fixed16.h" - in camtypes.h [AUTOMATICALLY REMOVED] DECLARE_SOURCE("$Revision: 1282 $"); /******************************************************************************************** > XLONG Mul(const INT32 operand1, const INT32 operand2) Author: Mario_Shamtani (Xara Group Ltd) Created: 26/4/93 Inputs: Two INT32 values SeeAlso: Xlongasm.h Outputs: None Returns: A reference to an xlong with result of multiplication. Purpose: Multiplication of two 32-bit signed numbers (xlongs). Errors: None. ********************************************************************************************/ /* Technical notes: ********************************************************************************************/ XLONG Mul(const INT32 operand1, const INT32 operand2) { XLONG result; XMul32(operand1, operand2, result); return result; } /******************************************************************************************** > XLONG Asl (const INT32, UINT32) Author: Mario_Shamtani (Xara Group Ltd) Created: 5/5/93 Inputs: INT32 - value to be shifted UINT32 - shift count Outputs: None Returns: XLONG - shifted number. Purpose: Performs arithmetic shift left. Errors: None. ********************************************************************************************/ /* Technical notes: Using the ASL provided with xlong for now. ********************************************************************************************/ XLONG Asl (const INT32 value, UINT32 shift) { XLONG result; result = MakeXLong(value); return (result << shift); } /******************************************************************************************** > XLONG Asr (const INT32, UINT32) Author: Mario_Shamtani (Xara Group Ltd) Created: 5/5/93 Inputs: INT32 - value to be shifted UINT32 - shift count Outputs: None Returns: XLONG - shifted number. Purpose: Performs arithmetic shift right. Errors: None. ********************************************************************************************/ /* Technical notes: Using the ASR provided with xlong for now. ********************************************************************************************/ XLONG Asr (const INT32 value, UINT32 shift) { return ( XLONG(value) >> shift); } /******************************************************************************************** > INT32 MulDiv32By32(const INT32 operand1, const INT32 operand2, const INT32 operand3) Author: Mario_Shamtani (Xara Group Ltd) Created: 5/5/93 SeeAlso: Xlongasm.h Inputs: operand1 - multiplicand 1 operand2 - multiplicand 2 operand3 - divisor Outputs: None Returns: INT32 - result of multiply-divide. Purpose: Multiplies two 32-bit values and divides the result by another 32-bit value. Errors: None. ********************************************************************************************/ /* Technical notes: ********************************************************************************************/ INT32 MulDiv32By32(const INT32 operand1, const INT32 operand2, const INT32 operand3) { return Mul32Div32( operand1, operand2, operand3 ); } /********************************************************************************************** > XLONG MakeXLong (const INT32 operand) Author: Mario_Shamtani (Xara Group Ltd) Created: 5/5/93 SeeAlso: Xlongasm.h Inputs: Long value to be converted. Outputs: None. Returns: an xlong value. Purpose: To convert an INT32 value to an xlong. Errors: None. **********************************************************************************************/ /* Technical notes: **********************************************************************************************/ XLONG MakeXLong (const INT32 operand) { return XLONG(operand); } /********************************************************************************************** > XLONG MakeXLong (const double operand) Author: Mario_Shamtani (Xara Group Ltd) Created: 5/5/93 SeeAlso: Xlongasm.h Inputs: double value to be converted. Outputs: None. Returns: an xlong value. Purpose: To convert a double value to an xlong. Errors: None. **********************************************************************************************/ /* Technical notes: **********************************************************************************************/ XLONG MakeXLong(const double operand) { xlong result; DoubleToXlong(operand, result); return result; } /******************************************************************************************** > FIXED16 Div32By32( INT32 arg1, INT32 arg2 ) Author: Andy_Pennell (Xara Group Ltd) Created: 11/5/93 Inputs: two signed 32-bit numbers Outputs: None Returns: FIXED16 result of arg1/arg2 Scope: Private to the CCMATHS library. Purpose: Obtain a fixed-point representation of the ratio between two signed numbers. Errors: None. Div0 and overflow will create a div0 exception. See Also: InternalDiv32by32 This fn is inline. ********************************************************************************************/ /******************************************************** < Maths Types < Maths Conversion Table < Conversion comment: \pard\plain \trowd \trgaph108\trleft-108 \cellx1593\cellx3294\cellx4995\cellx6696\cellx8397\cellx10098\pard\plain \qc \intbl \fs20\lang2057 {\b From}{\b }{\b \\}{\b }{\b To}{\b \cell }{\b INT32}{\b \cell } {\b INT32}{\b \cell }{\b XLONG}{\b \cell }{\b FIXED16}{\b \cell }{\b double}{\b \cell }\row \qc\intbl {\b INT32}{\b \cell }-\cell auto \cell constructor \par operator=\cell constructor \par operator=\cell auto\cell \pard \intbl \row \pard \qc\intbl {\b INT32}{\b \cell } built-in cast\cell -\cell MakeXlong() \par constructor \par operator= \par cast operator\cell operator= \par constructor\cell auto\cell \pard \intbl \row \pard \qc\intbl {\b XLONG}{\b \cell } MakeInt()\cell MakeLong()\cell -\cell MakeFixed16()\cell MakeDouble()\cell \pard \intbl \row \pard \qc\intbl {\b FIXED16}{\b \cell }MakeInt()\cell MakeLong()\cell MakeXlong()\cell -\cell MakeDouble()\cell \row \qc\intbl {\b double} {\b \cell }explicit cast\cell explicit cast\cell MakeXlong()\cell operator= \par constructor\cell -\cell \pard \intbl \row \pard ******************************************************************/