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271 lines
8.9 KiB
C++
271 lines
8.9 KiB
C++
/* ***** 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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* Dainis Jonitis, <Dainis_Jonitis@swh-t.lv>.
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* Portions created by the Initial Developer are Copyright (C) 2001
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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 nsRegion_h__
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#define nsRegion_h__
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// Implementation of region.
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// Region is represented as circular double-linked list of nsRegion::RgnRect structures.
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// Rectangles in this list do not overlap and are sorted by (y, x) coordinates.
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#include "nsRect.h"
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#include "nsPoint.h"
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class NS_GFX nsRegion
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{
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friend class nsRegionRectIterator;
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friend class RgnRectMemoryAllocator;
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// Special version of nsRect structure for speed optimizations in nsRegion code.
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// Most important functions could be made inline and be sure that passed rectangles
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// will always be non-empty.
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//
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// Do not add any new member variables to this structure!
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// Otherwise it will break casts from nsRect to nsRectFast, which expect data parts to be identical.
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struct nsRectFast : public nsRect
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{
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nsRectFast () {} // No need to call parent constructor to set default values
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nsRectFast (PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) : nsRect (aX, aY, aWidth, aHeight) {}
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nsRectFast (const nsRect& aRect) : nsRect (aRect) {}
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// Override nsRect methods to make them inline. Do not check for emptiness.
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inline PRBool Contains (const nsRect& aRect) const;
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inline PRBool Intersects (const nsRect& aRect) const;
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inline PRBool IntersectRect (const nsRect& aRect1, const nsRect& aRect2);
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inline void UnionRect (const nsRect& aRect1, const nsRect& aRect2);
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};
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struct RgnRect : public nsRectFast
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{
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RgnRect* prev;
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RgnRect* next;
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RgnRect () {} // No need to call parent constructor to set default values
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RgnRect (PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) : nsRectFast (aX, aY, aWidth, aHeight) {}
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RgnRect (const nsRectFast& aRect) : nsRectFast (aRect) {}
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inline void* operator new (size_t) CPP_THROW_NEW;
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inline void operator delete (void* aRect, size_t);
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RgnRect& operator = (const RgnRect& aRect) // Do not overwrite prev/next pointers
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{
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x = aRect.x;
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y = aRect.y;
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width = aRect.width;
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height = aRect.height;
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return *this;
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}
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};
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public:
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nsRegion () { Init (); }
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nsRegion (const nsRect& aRect) { Init (); Copy (aRect); }
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nsRegion (const nsRegion& aRegion) { Init (); Copy (aRegion); }
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~nsRegion () { SetToElements (0); }
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nsRegion& operator = (const nsRect& aRect) { Copy (aRect); return *this; }
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nsRegion& operator = (const nsRegion& aRegion) { Copy (aRegion); return *this; }
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nsRegion& And (const nsRegion& aRgn1, const nsRegion& aRgn2);
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nsRegion& And (const nsRegion& aRegion, const nsRect& aRect);
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nsRegion& And (const nsRect& aRect, const nsRegion& aRegion)
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{
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return And (aRegion, aRect);
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}
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nsRegion& And (const nsRect& aRect1, const nsRect& aRect2)
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{
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nsRect TmpRect;
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TmpRect.IntersectRect (aRect1, aRect2);
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return Copy (TmpRect);
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}
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nsRegion& Or (const nsRegion& aRgn1, const nsRegion& aRgn2);
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nsRegion& Or (const nsRegion& aRegion, const nsRect& aRect);
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nsRegion& Or (const nsRect& aRect, const nsRegion& aRegion)
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{
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return Or (aRegion, aRect);
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}
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nsRegion& Or (const nsRect& aRect1, const nsRect& aRect2)
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{
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Copy (aRect1);
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return Or (*this, aRect2);
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}
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nsRegion& Xor (const nsRegion& aRgn1, const nsRegion& aRgn2);
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nsRegion& Xor (const nsRegion& aRegion, const nsRect& aRect);
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nsRegion& Xor (const nsRect& aRect, const nsRegion& aRegion)
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{
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return Xor (aRegion, aRect);
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}
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nsRegion& Xor (const nsRect& aRect1, const nsRect& aRect2)
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{
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Copy (aRect1);
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return Xor (*this, aRect2);
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}
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nsRegion& Sub (const nsRegion& aRgn1, const nsRegion& aRgn2);
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nsRegion& Sub (const nsRegion& aRegion, const nsRect& aRect);
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nsRegion& Sub (const nsRect& aRect, const nsRegion& aRegion)
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{
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return Sub (nsRegion (aRect), aRegion);
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}
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nsRegion& Sub (const nsRect& aRect1, const nsRect& aRect2)
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{
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Copy (aRect1);
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return Sub (*this, aRect2);
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}
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PRBool Contains (const nsRect& aRect) const;
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PRBool Intersects (const nsRect& aRect) const;
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void MoveBy (PRInt32 aXOffset, PRInt32 aYOffset)
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{
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MoveBy (nsPoint (aXOffset, aYOffset));
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}
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void MoveBy (nsPoint aPt);
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void SetEmpty ()
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{
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SetToElements (0);
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mBoundRect.SetRect (0, 0, 0, 0);
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}
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PRBool IsEmpty () const { return mRectCount == 0; }
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PRBool IsComplex () const { return mRectCount > 1; }
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PRBool IsEqual (const nsRegion& aRegion) const;
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PRUint32 GetNumRects () const { return mRectCount; }
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const nsRect& GetBounds () const { return mBoundRect; }
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/**
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* Make sure the region has at most aMaxRects by adding area to it
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* if necessary. The simplified region will be a superset of the
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* original region. The simplified region's bounding box will be
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* the same as for the current region.
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*/
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void SimplifyOutward (PRUint32 aMaxRects);
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/**
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* Make sure the region has at most aMaxRects by removing area from
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* it if necessary. The simplified region will be a subset of the
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* original region.
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*/
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void SimplifyInward (PRUint32 aMaxRects);
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/**
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* Efficiently try to remove a rectangle from this region. The actual
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* area removed could be some sub-area contained by the rectangle
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* (even possibly nothing at all).
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*
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* We remove all rectangles that are contained by aRect.
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*/
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void SimpleSubtract (const nsRect& aRect);
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/**
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* Efficiently try to remove a region from this region. The actual
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* area removed could be some sub-area contained by aRegion
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* (even possibly nothing at all).
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*
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* We remove all rectangles of this region that are contained by
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* a rectangle of aRegion.
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*/
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void SimpleSubtract (const nsRegion& aRegion);
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private:
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PRUint32 mRectCount;
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RgnRect* mCurRect;
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RgnRect mRectListHead;
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nsRectFast mBoundRect;
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void Init ();
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nsRegion& Copy (const nsRegion& aRegion);
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nsRegion& Copy (const nsRect& aRect);
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void InsertBefore (RgnRect* aNewRect, RgnRect* aRelativeRect);
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void InsertAfter (RgnRect* aNewRect, RgnRect* aRelativeRect);
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void SetToElements (PRUint32 aCount);
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RgnRect* Remove (RgnRect* aRect);
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void InsertInPlace (RgnRect* aRect, PRBool aOptimizeOnFly = PR_FALSE);
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inline void SaveLinkChain ();
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inline void RestoreLinkChain ();
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void Optimize ();
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void SubRegion (const nsRegion& aRegion, nsRegion& aResult) const;
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void SubRect (const nsRectFast& aRect, nsRegion& aResult, nsRegion& aCompleted) const;
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void SubRect (const nsRectFast& aRect, nsRegion& aResult) const
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{ SubRect (aRect, aResult, aResult); }
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void Merge (const nsRegion& aRgn1, const nsRegion& aRgn2);
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void MoveInto (nsRegion& aDestRegion, const RgnRect* aStartRect);
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void MoveInto (nsRegion& aDestRegion)
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{ MoveInto (aDestRegion, mRectListHead.next); }
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};
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// Allow read-only access to region rectangles by iterating the list
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class NS_GFX nsRegionRectIterator
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{
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const nsRegion* mRegion;
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const nsRegion::RgnRect* mCurPtr;
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public:
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nsRegionRectIterator (const nsRegion& aRegion)
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{
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mRegion = &aRegion;
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mCurPtr = &aRegion.mRectListHead;
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}
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const nsRect* Next ()
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{
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mCurPtr = mCurPtr->next;
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return (mCurPtr != &mRegion->mRectListHead) ? mCurPtr : nsnull;
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}
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const nsRect* Prev ()
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{
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mCurPtr = mCurPtr->prev;
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return (mCurPtr != &mRegion->mRectListHead) ? mCurPtr : nsnull;
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}
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void Reset ()
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{
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mCurPtr = &mRegion->mRectListHead;
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}
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};
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#endif
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