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- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla 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/MPL/
- *
- * 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 of 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 MPL, 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 MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef nsUnitConversion_h__
- #define nsUnitConversion_h__
-
- #include "nscore.h"
- #include "nsCoord.h"
- #include <math.h>
- #include <float.h>
-
- #ifndef FLT_EPSILON
- // Not an ANSI compiler... oh, well. Use an IEEE value.
- #define FLT_EPSILON 1.19209290e-7f
- #endif
- /// handy constants
- #define TWIPS_PER_POINT_INT 20
- #define TWIPS_PER_POINT_FLOAT 20.0f
- #define ROUND_CONST_FLOAT 0.5f
- #define CEIL_CONST_FLOAT (1.0f - 0.5f*FLT_EPSILON)
-
-
- /*
- * Coord Rounding Functions
- */
- inline nscoord NSToCoordFloor(float aValue)
- {
- #ifdef NS_COORD_IS_FLOAT
- return floorf(aValue);
- #else
- return ((0.0f <= aValue) ? nscoord(aValue) : nscoord(aValue - CEIL_CONST_FLOAT));
- #endif
- }
-
- inline nscoord NSToCoordCeil(float aValue)
- {
- #ifdef NS_COORD_IS_FLOAT
- return ceilf(aValue);
- #else
- return ((0.0f <= aValue) ? nscoord(aValue + CEIL_CONST_FLOAT) : nscoord(aValue));
- #endif
- }
-
- inline nscoord NSToCoordRound(float aValue)
- {
- #ifdef NS_COORD_IS_FLOAT
- return floorf(aValue + ROUND_CONST_FLOAT);
- #else
- return ((0.0f <= aValue) ? nscoord(aValue + ROUND_CONST_FLOAT) : nscoord(aValue - ROUND_CONST_FLOAT));
- #endif
- }
-
- /*
- * 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));
- }
-
- /*
- * Twips/Points conversions
- */
- inline nscoord NSFloatPointsToTwips(float aPoints)
- {
- return NSToCoordRound(aPoints * TWIPS_PER_POINT_FLOAT);
- }
-
- inline nscoord NSIntPointsToTwips(PRInt32 aPoints)
- {
- // If nscoord is a float, do the multiplication as float to avoid
- // overflow
- 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)
- {
- nscoord r = NSToCoordRound(aPixels * aTwipsPerPixel);
- VERIFY_COORD(r);
- return r;
- }
-
- inline nscoord NSIntPixelsToTwips(PRInt32 aPixels, float aTwipsPerPixel)
- {
- #ifdef NS_COORD_IS_FLOAT
- nscoord r = aPixels * aTwipsPerPixel;
- #else
- nscoord r = NSToCoordRound(float(aPixels) * aTwipsPerPixel);
- #endif
- VERIFY_COORD(r);
- return r;
- }
-
- 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
-