зеркало из https://github.com/mozilla/gecko-dev.git
202 строки
6.8 KiB
C
202 строки
6.8 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.1 (the "License"); you may not use this file except in
|
|
* compliance with the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the NPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the NPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
#ifndef nsUnitConversion_h__
|
|
#define nsUnitConversion_h__
|
|
|
|
#include "nscore.h"
|
|
#include <math.h>
|
|
|
|
/// handy constants
|
|
#define TWIPS_PER_POINT_INT 20
|
|
#define TWIPS_PER_POINT_FLOAT 20.0f
|
|
#define ROUND_EXCLUSIVE_CONST_FLOAT 0.4999999999999999f // XXX this should be derived from platform FLOAT_MIN
|
|
#define ROUND_CONST_FLOAT 0.5f
|
|
#define CEIL_CONST_FLOAT 0.9999999999999999f // XXX this should be derived from platform FLOAT_MIN
|
|
|
|
|
|
/*
|
|
* Coord Rounding Functions
|
|
*/
|
|
inline nscoord NSToCoordFloor(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? nscoord(aValue) : nscoord(aValue - CEIL_CONST_FLOAT));
|
|
}
|
|
|
|
inline nscoord NSToCoordCeil(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? nscoord(aValue + CEIL_CONST_FLOAT) : nscoord(aValue));
|
|
}
|
|
|
|
inline nscoord NSToCoordRound(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? nscoord(aValue + ROUND_CONST_FLOAT) : nscoord(aValue - ROUND_CONST_FLOAT));
|
|
}
|
|
|
|
inline nscoord NSToCoordRoundExclusive(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? nscoord(aValue + ROUND_EXCLUSIVE_CONST_FLOAT) :
|
|
nscoord(aValue - ROUND_EXCLUSIVE_CONST_FLOAT));
|
|
}
|
|
|
|
|
|
/*
|
|
* Int Rounding Functions
|
|
*/
|
|
inline PRInt32 NSToIntFloor(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? PRInt32(aValue) : PRInt32(aValue - CEIL_CONST_FLOAT));
|
|
}
|
|
|
|
inline PRInt32 NSToIntCeil(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? PRInt32(aValue + CEIL_CONST_FLOAT) : PRInt32(aValue));
|
|
}
|
|
|
|
inline PRInt32 NSToIntRound(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? PRInt32(aValue + ROUND_CONST_FLOAT) : PRInt32(aValue - ROUND_CONST_FLOAT));
|
|
}
|
|
|
|
inline PRInt32 NSToIntRoundExclusive(float aValue)
|
|
{
|
|
return ((0.0f <= aValue) ? PRInt32(aValue + ROUND_EXCLUSIVE_CONST_FLOAT) :
|
|
PRInt32(aValue - ROUND_EXCLUSIVE_CONST_FLOAT));
|
|
}
|
|
|
|
|
|
/*
|
|
* Twips/Points conversions
|
|
*/
|
|
inline nscoord NSFloatPointsToTwips(float aPoints)
|
|
{
|
|
return NSToCoordRound(aPoints * TWIPS_PER_POINT_FLOAT);
|
|
}
|
|
|
|
inline nscoord NSIntPointsToTwips(PRInt32 aPoints)
|
|
{
|
|
return nscoord(aPoints * TWIPS_PER_POINT_INT);
|
|
}
|
|
|
|
inline PRInt32 NSTwipsToIntPoints(nscoord aTwips)
|
|
{
|
|
return NSToIntRound(aTwips / TWIPS_PER_POINT_FLOAT);
|
|
}
|
|
|
|
inline PRInt32 NSTwipsToFloorIntPoints(nscoord aTwips)
|
|
{
|
|
return NSToIntFloor(aTwips / TWIPS_PER_POINT_FLOAT);
|
|
}
|
|
|
|
inline PRInt32 NSTwipsToCeilIntPoints(nscoord aTwips)
|
|
{
|
|
return NSToIntCeil(aTwips / TWIPS_PER_POINT_FLOAT);
|
|
}
|
|
|
|
inline float NSTwipsToFloatPoints(nscoord aTwips)
|
|
{
|
|
return (float(aTwips) / TWIPS_PER_POINT_FLOAT);
|
|
}
|
|
|
|
/*
|
|
* Twips/Pixel conversions
|
|
*/
|
|
inline nscoord NSFloatPixelsToTwips(float aPixels, float aTwipsPerPixel)
|
|
{
|
|
return NSToCoordRound(aPixels * aTwipsPerPixel);
|
|
}
|
|
|
|
inline nscoord NSIntPixelsToTwips(PRInt32 aPixels, float aTwipsPerPixel)
|
|
{
|
|
return NSToCoordRound(float(aPixels) * aTwipsPerPixel);
|
|
}
|
|
|
|
inline float NSTwipsToFloatPixels(nscoord aTwips, float aPixelsPerTwip)
|
|
{
|
|
return (float(aTwips) * aPixelsPerTwip);
|
|
}
|
|
|
|
inline PRInt32 NSTwipsToIntPixels(nscoord aTwips, float aPixelsPerTwip)
|
|
{
|
|
return NSToIntRound(float(aTwips) * aPixelsPerTwip);
|
|
}
|
|
|
|
/*
|
|
* Twips/unit conversions
|
|
*/
|
|
inline nscoord NSUnitsToTwips(float aValue, float aPointsPerUnit)
|
|
{
|
|
return NSToCoordRound(aValue * aPointsPerUnit * TWIPS_PER_POINT_FLOAT);
|
|
}
|
|
|
|
inline float NSTwipsToUnits(nscoord aTwips, float aUnitsPerPoint)
|
|
{
|
|
return (aTwips * (aUnitsPerPoint / TWIPS_PER_POINT_FLOAT));
|
|
}
|
|
|
|
|
|
/// Unit conversion macros
|
|
//@{
|
|
#define NS_INCHES_TO_TWIPS(x) NSUnitsToTwips((x), 72.0f) // 72 points per inch
|
|
#define NS_FEET_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 12.0f)) // 12 inches per foot
|
|
#define NS_MILES_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 12.0f * 5280.0f)) // 5280 feet per mile
|
|
|
|
#define NS_MILLIMETERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 0.03937f))
|
|
#define NS_CENTIMETERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 0.3937f))
|
|
#define NS_METERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 39.37f))
|
|
#define NS_KILOMETERS_TO_TWIPS(x) NSUnitsToTwips((x), (72.0f * 39370.0f))
|
|
|
|
#define NS_PICAS_TO_TWIPS(x) NSUnitsToTwips((x), 12.0f) // 12 points per pica
|
|
#define NS_DIDOTS_TO_TWIPS(x) NSUnitsToTwips((x), (16.0f / 15.0f)) // 15 didots per 16 points
|
|
#define NS_CICEROS_TO_TWIPS(x) NSUnitsToTwips((x), (12.0f * (16.0f / 15.0f))) // 12 didots per cicero
|
|
|
|
|
|
#define NS_TWIPS_TO_INCHES(x) NSTwipsToUnits((x), 1.0f / 72.0f)
|
|
#define NS_TWIPS_TO_FEET(x) NSTwipsToUnits((x), 1.0f / (72.0f * 12.0f))
|
|
#define NS_TWIPS_TO_MILES(x) NSTwipsToUnits((x), 1.0f / (72.0f * 12.0f * 5280.0f))
|
|
|
|
#define NS_TWIPS_TO_MILLIMETERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 0.03937f))
|
|
#define NS_TWIPS_TO_CENTIMETERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 0.3937f))
|
|
#define NS_TWIPS_TO_METERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 39.37f))
|
|
#define NS_TWIPS_TO_KILOMETERS(x) NSTwipsToUnits((x), 1.0f / (72.0f * 39370.0f))
|
|
|
|
#define NS_TWIPS_TO_PICAS(x) NSTwipsToUnits((x), 1.0f / 12.0f)
|
|
#define NS_TWIPS_TO_DIDOTS(x) NSTwipsToUnits((x), 1.0f / (16.0f / 15.0f))
|
|
#define NS_TWIPS_TO_CICEROS(x) NSTwipsToUnits((x), 1.0f / (12.0f * (16.0f / 15.0f)))
|
|
//@}
|
|
|
|
#endif
|