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254 lines
9.9 KiB
C
254 lines
9.9 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef NSRECT_H
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#define NSRECT_H
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#include <stdio.h>
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#include "nsCoord.h"
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#include "nsPoint.h"
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#include "nsSize.h"
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#include "nsMargin.h"
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#include "gfxCore.h"
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#include "nsTraceRefcnt.h"
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struct NS_GFX nsRect {
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nscoord x, y;
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nscoord width, height;
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// Constructors
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nsRect() : x(0), y(0), width(0), height(0) {
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MOZ_COUNT_CTOR(nsRect);
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}
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nsRect(const nsRect& aRect) {
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MOZ_COUNT_CTOR(nsRect);
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*this = aRect;
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}
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nsRect(const nsPoint& aOrigin, const nsSize &aSize) {
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MOZ_COUNT_CTOR(nsRect);
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x = aOrigin.x; y = aOrigin.y;
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width = aSize.width; height = aSize.height;
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}
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nsRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight) {
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MOZ_COUNT_CTOR(nsRect);
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x = aX; y = aY; width = aWidth; height = aHeight;
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VERIFY_COORD(x); VERIFY_COORD(y); VERIFY_COORD(width); VERIFY_COORD(height);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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~nsRect() {
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MOZ_COUNT_DTOR(nsRect);
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}
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#endif
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// Emptiness. An empty rect is one that has no area, i.e. its height or width
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// is <= 0
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PRBool IsEmpty() const {
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return (PRBool) ((height <= 0) || (width <= 0));
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}
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void Empty() {width = height = 0;}
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// Containment
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PRBool Contains(const nsRect& aRect) const;
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PRBool Contains(nscoord aX, nscoord aY) const;
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PRBool Contains(const nsPoint& aPoint) const {return Contains(aPoint.x, aPoint.y);}
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// Intersection. Returns TRUE if the receiver overlaps aRect and
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// FALSE otherwise
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PRBool Intersects(const nsRect& aRect) const;
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// Computes the area in which aRect1 and aRect2 overlap, and fills 'this' with
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// the result. Returns FALSE if the rectangles don't intersect, and sets 'this'
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// rect to be an empty rect.
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//
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// 'this' can be the same object as either aRect1 or aRect2
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PRBool IntersectRect(const nsRect& aRect1, const nsRect& aRect2);
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// Computes the smallest rectangle that contains both aRect1 and aRect2 and
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// fills 'this' with the result, ignoring empty input rectangles.
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// Returns FALSE and sets 'this' rect to be an empty rect if both aRect1
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// and aRect2 are empty.
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//
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// 'this' can be the same object as either aRect1 or aRect2
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PRBool UnionRect(const nsRect& aRect1, const nsRect& aRect2);
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// Computes the smallest rectangle that contains both aRect1 and aRect2,
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// where empty input rectangles are allowed to affect the result; the
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// top-left of an empty input rectangle will be inside or on the edge of
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// the result.
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//
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// 'this' can be the same object as either aRect1 or aRect2
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void UnionRectIncludeEmpty(const nsRect& aRect1, const nsRect& aRect2);
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// Accessors
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void SetRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight) {
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x = aX; y = aY; width = aWidth; height = aHeight;
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}
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void SetRect(const nsPoint& aPt, const nsSize& aSize) {
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SetRect(aPt.x, aPt.y, aSize.width, aSize.height);
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}
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void MoveTo(nscoord aX, nscoord aY) {x = aX; y = aY;}
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void MoveTo(const nsPoint& aPoint) {x = aPoint.x; y = aPoint.y;}
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void MoveBy(nscoord aDx, nscoord aDy) {x += aDx; y += aDy;}
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void MoveBy(const nsPoint& aPoint) {x += aPoint.x; y += aPoint.y;}
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void SizeTo(nscoord aWidth, nscoord aHeight) {width = aWidth; height = aHeight;}
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void SizeTo(const nsSize& aSize) {SizeTo(aSize.width, aSize.height);}
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void SizeBy(nscoord aDeltaWidth, nscoord aDeltaHeight) {width += aDeltaWidth;
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height += aDeltaHeight;}
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// Inflate the rect by the specified width/height or margin
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void Inflate(nscoord aDx, nscoord aDy);
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void Inflate(const nsSize& aSize) {Inflate(aSize.width, aSize.height);}
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void Inflate(const nsMargin& aMargin);
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// Deflate the rect by the specified width/height or margin
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void Deflate(nscoord aDx, nscoord aDy);
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void Deflate(const nsSize& aSize) {Deflate(aSize.width, aSize.height);}
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void Deflate(const nsMargin& aMargin);
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// Overloaded operators. Note that '=' isn't defined so we'll get the
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// compiler generated default assignment operator.
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PRBool operator==(const nsRect& aRect) const {
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return (PRBool) ((IsEmpty() && aRect.IsEmpty()) ||
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((x == aRect.x) && (y == aRect.y) &&
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(width == aRect.width) && (height == aRect.height)));
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}
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PRBool operator!=(const nsRect& aRect) const {
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return (PRBool) !operator==(aRect);
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}
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// Useful when we care about the exact x/y/width/height values being
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// equal (i.e. we care about differences in empty rectangles)
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PRBool IsExactEqual(const nsRect& aRect) const {
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return x == aRect.x && y == aRect.y &&
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width == aRect.width && height == aRect.height;
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}
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nsRect operator+(const nsPoint& aPoint) const {
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return nsRect(x + aPoint.x, y + aPoint.y, width, height);
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}
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nsRect operator-(const nsPoint& aPoint) const {
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return nsRect(x - aPoint.x, y - aPoint.y, width, height);
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}
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nsRect& operator+=(const nsPoint& aPoint) {x += aPoint.x; y += aPoint.y; return *this;}
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nsRect& operator-=(const nsPoint& aPoint) {x -= aPoint.x; y -= aPoint.y; return *this;}
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nsRect& operator*=(const float aScale) {x = NSToCoordRound(x * aScale);
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y = NSToCoordRound(y * aScale);
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width = NSToCoordRound(width * aScale);
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height = NSToCoordRound(height * aScale);
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return *this;}
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// Scale by aScale, converting coordinates to integers so that the result
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// is the smallest integer-coordinate rectangle containing the unrounded result
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nsRect& ScaleRoundOut(float aScale);
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// Scale by the inverse of aScale, converting coordinates to integers so that the result
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// is the smallest integer-coordinate rectangle containing the unrounded result.
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// More accurate than ScaleRoundOut(1.0/aScale).
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nsRect& ScaleRoundOutInverse(float aScale);
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// Scale by aScale, converting coordinates to integers so that the result
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// is the larges integer-coordinate rectangle contained in the unrounded result
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nsRect& ScaleRoundIn(float aScale);
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// Scale by the inverse of aScale, converting coordinates to integers so that
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// the result contains the same pixel centers as the unrounded result
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nsRect& ScaleRoundPreservingCentersInverse(float aScale);
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// Helpers for accessing the vertices
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nsPoint TopLeft() const { return nsPoint(x, y); }
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nsPoint TopRight() const { return nsPoint(XMost(), y); }
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nsPoint BottomLeft() const { return nsPoint(x, YMost()); }
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nsPoint BottomRight() const { return nsPoint(XMost(), YMost()); }
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nsSize Size() const { return nsSize(width, height); }
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// Helper methods for computing the extents
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nscoord XMost() const {return x + width;}
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nscoord YMost() const {return y + height;}
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};
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#ifdef NS_COORD_IS_FLOAT
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struct NS_GFX nsIntRect {
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PRInt32 x, y;
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PRInt32 width, height;
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// Constructors
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nsIntRect() : x(0), y(0), width(0), height(0) {}
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nsIntRect(const nsIntRect& aRect) {*this = aRect;}
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nsIntRect(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) {
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x = aX; y = aY; width = aWidth; height = aHeight;
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}
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// Emptiness. An empty rect is one that has no area, i.e. its height or width
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// is <= 0
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PRBool IsEmpty() const {
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return (PRBool) ((height <= 0) || (width <= 0));
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}
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void SetRect(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) {
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x = aX; y = aY; width = aWidth; height = aHeight;
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}
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// Computes the area in which aRect1 and aRect2 overlap, and fills 'this' with
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// the result. Returns FALSE if the rectangles don't intersect, and sets 'this'
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// rect to be an empty rect.
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//
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// 'this' can be the same object as either aRect1 or aRect2
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PRBool IntersectRect(const nsIntRect& aRect1, const nsIntRect& aRect2);
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// Computes the smallest rectangle that contains both aRect1 and aRect2 and
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// fills 'this' with the result. Returns FALSE and sets 'this' rect to be an
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// empty rect if both aRect1 and aRect2 are empty
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//
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// 'this' can be the same object as either aRect1 or aRect2
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PRBool UnionRect(const nsIntRect& aRect1, const nsIntRect& aRect2);
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// Helper methods for computing the extents
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PRInt32 XMost() const {return x + width;}
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PRInt32 YMost() const {return y + height;}
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};
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#else
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typedef nsRect nsIntRect;
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#endif
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#ifdef DEBUG
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// Diagnostics
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extern NS_GFX FILE* operator<<(FILE* out, const nsRect& rect);
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#endif // DEBUG
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#endif /* NSRECT_H */
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