зеркало из https://github.com/mozilla/pjs.git
208 строки
6.9 KiB
C
208 строки
6.9 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsUnitConversion_h__
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#define nsUnitConversion_h__
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#include "nscore.h"
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#include "nsCoord.h"
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#include <math.h>
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#include <float.h>
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#ifndef FLT_EPSILON
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// Not an ANSI compiler... oh, well. Make up something sane
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#define FLT_EPSILON 1.0e-07f
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#endif
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/// handy constants
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#define TWIPS_PER_POINT_INT 20
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#define TWIPS_PER_POINT_FLOAT 20.0f
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#define CEIL_CONST_FLOAT (1.0f - FLT_EPSILON)
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#define ROUND_EXCLUSIVE_CONST_FLOAT (0.5f*CEIL_CONST_FLOAT)
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#define ROUND_CONST_FLOAT 0.5f
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/*
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* Coord Rounding Functions
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*/
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inline nscoord NSToCoordFloor(float aValue)
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{
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return ((0.0f <= aValue) ? nscoord(aValue) : nscoord(aValue - CEIL_CONST_FLOAT));
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}
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inline nscoord NSToCoordCeil(float aValue)
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{
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return ((0.0f <= aValue) ? nscoord(aValue + CEIL_CONST_FLOAT) : nscoord(aValue));
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}
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inline nscoord NSToCoordRound(float aValue)
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{
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return ((0.0f <= aValue) ? nscoord(aValue + ROUND_CONST_FLOAT) : nscoord(aValue - ROUND_CONST_FLOAT));
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}
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inline nscoord NSToCoordRoundExclusive(float aValue)
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{
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return ((0.0f <= aValue) ? nscoord(aValue + ROUND_EXCLUSIVE_CONST_FLOAT) :
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nscoord(aValue - ROUND_EXCLUSIVE_CONST_FLOAT));
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}
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/*
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* Int Rounding Functions
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*/
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inline PRInt32 NSToIntFloor(float aValue)
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{
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return ((0.0f <= aValue) ? PRInt32(aValue) : PRInt32(aValue - CEIL_CONST_FLOAT));
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}
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inline PRInt32 NSToIntCeil(float aValue)
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{
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return ((0.0f <= aValue) ? PRInt32(aValue + CEIL_CONST_FLOAT) : PRInt32(aValue));
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}
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inline PRInt32 NSToIntRound(float aValue)
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{
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return ((0.0f <= aValue) ? PRInt32(aValue + ROUND_CONST_FLOAT) : PRInt32(aValue - ROUND_CONST_FLOAT));
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}
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inline PRInt32 NSToIntRoundExclusive(float aValue)
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{
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return ((0.0f <= aValue) ? PRInt32(aValue + ROUND_EXCLUSIVE_CONST_FLOAT) :
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PRInt32(aValue - ROUND_EXCLUSIVE_CONST_FLOAT));
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}
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/*
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* Twips/Points conversions
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*/
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inline nscoord NSFloatPointsToTwips(float aPoints)
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{
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return NSToCoordRound(aPoints * TWIPS_PER_POINT_FLOAT);
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}
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inline nscoord NSIntPointsToTwips(PRInt32 aPoints)
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{
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return nscoord(aPoints * TWIPS_PER_POINT_INT);
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}
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inline PRInt32 NSTwipsToIntPoints(nscoord aTwips)
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{
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return NSToIntRound(aTwips / TWIPS_PER_POINT_FLOAT);
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}
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inline PRInt32 NSTwipsToFloorIntPoints(nscoord aTwips)
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{
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return NSToIntFloor(aTwips / TWIPS_PER_POINT_FLOAT);
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}
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inline PRInt32 NSTwipsToCeilIntPoints(nscoord aTwips)
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{
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return NSToIntCeil(aTwips / TWIPS_PER_POINT_FLOAT);
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}
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inline float NSTwipsToFloatPoints(nscoord aTwips)
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{
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return (float(aTwips) / TWIPS_PER_POINT_FLOAT);
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}
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/*
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* Twips/Pixel conversions
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*/
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inline nscoord NSFloatPixelsToTwips(float aPixels, float aTwipsPerPixel)
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{
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return NSToCoordRound(aPixels * aTwipsPerPixel);
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}
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inline nscoord NSIntPixelsToTwips(PRInt32 aPixels, float aTwipsPerPixel)
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{
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return NSToCoordRound(float(aPixels) * aTwipsPerPixel);
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}
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inline float NSTwipsToFloatPixels(nscoord aTwips, float aPixelsPerTwip)
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{
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return (float(aTwips) * aPixelsPerTwip);
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}
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inline PRInt32 NSTwipsToIntPixels(nscoord aTwips, float aPixelsPerTwip)
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{
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return NSToIntRound(float(aTwips) * aPixelsPerTwip);
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}
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/*
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* Twips/unit conversions
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*/
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inline nscoord NSUnitsToTwips(float aValue, float aPointsPerUnit)
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{
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return NSToCoordRound(aValue * aPointsPerUnit * TWIPS_PER_POINT_FLOAT);
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}
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inline float NSTwipsToUnits(nscoord aTwips, float aUnitsPerPoint)
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{
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return (aTwips * (aUnitsPerPoint / TWIPS_PER_POINT_FLOAT));
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}
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/// Unit conversion macros
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//@{
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#define NS_INCHES_TO_TWIPS(x) NSUnitsToTwips((x), 72.0f) // 72 points per inch
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#define NS_FEET_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 12.0f)) // 12 inches per foot
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#define NS_MILES_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 12.0f * 5280.0f)) // 5280 feet per mile
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#define NS_MILLIMETERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 0.03937f))
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#define NS_CENTIMETERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 0.3937f))
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#define NS_METERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 39.37f))
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#define NS_KILOMETERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 39370.0f))
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#define NS_PICAS_TO_TWIPS(x) NSUnitsToTwips((x), 12.0f) // 12 points per pica
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#define NS_DIDOTS_TO_TWIPS(x) NSUnitsToTwips((x), (16.0f / 15.0f)) // 15 didots per 16 points
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#define NS_CICEROS_TO_TWIPS(x) NSUnitsToTwips((x), (12.0f * (16.0f / 15.0f))) // 12 didots per cicero
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#define NS_TWIPS_TO_INCHES(x) NSTwipsToUnits((x), 1.0f / 72.0f)
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#define NS_TWIPS_TO_FEET(x) NSTwipsToUnits((x), 1.0f / (72.0f * 12.0f))
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#define NS_TWIPS_TO_MILES(x) NSTwipsToUnits((x), 1.0f / (72.0f * 12.0f * 5280.0f))
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#define NS_TWIPS_TO_MILLIMETERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 0.03937f))
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#define NS_TWIPS_TO_CENTIMETERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 0.3937f))
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#define NS_TWIPS_TO_METERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 39.37f))
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#define NS_TWIPS_TO_KILOMETERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 39370.0f))
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#define NS_TWIPS_TO_PICAS(x) NSTwipsToUnits((x), 1.0f / 12.0f)
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#define NS_TWIPS_TO_DIDOTS(x) NSTwipsToUnits((x), 1.0f / (16.0f / 15.0f))
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#define NS_TWIPS_TO_CICEROS(x) NSTwipsToUnits((x), 1.0f / (12.0f * (16.0f / 15.0f)))
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//@}
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#endif
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