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280 lines
7.9 KiB
C++
280 lines
7.9 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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*
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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 nsIRegion_h___
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#define nsIRegion_h___
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#include "nscore.h"
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#include "nsISupports.h"
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#include "nsRect.h"
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enum nsRegionComplexity
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{
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eRegionComplexity_empty = 0,
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eRegionComplexity_rect = 1,
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eRegionComplexity_complex = 2
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};
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typedef struct
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{
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PRInt32 x;
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PRInt32 y;
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PRUint32 width;
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PRUint32 height;
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} nsRegionRect;
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typedef struct
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{
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PRUint32 mNumRects; //number of actual rects in the mRects array
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PRUint32 mRectsLen; //length, in rects, of the mRects array
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PRUint32 mArea; //area of the covered portion of the region
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nsRegionRect mRects[1];
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} nsRegionRectSet;
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// An implementation of a region primitive that can be used to
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// represent arbitrary pixel areas. Probably implemented on top
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// of the native region primitive. The assumption is that, at worst,
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// it is a rectangle list.
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#define NS_IREGION_IID \
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{ 0x8ef366e0, 0xee94, 0x11d1, \
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{ 0xa8, 0x2a, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
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class nsIRegion : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IREGION_IID)
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virtual nsresult Init(void) = 0;
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/**
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* copy operator equivalent that takes another region
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*
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* @param region to copy
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* @return void
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*
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**/
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virtual void SetTo(const nsIRegion &aRegion) = 0;
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/**
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* copy operator equivalent that takes a rect
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*
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* @param aX xoffset of rect to set region to
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* @param aY yoffset of rect to set region to
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* @param aWidth width of rect to set region to
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* @param aHeight height of rect to set region to
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* @return void
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*
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**/
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virtual void SetTo(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) = 0;
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/**
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* destructively intersect another region with this one
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*
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* @param region to intersect
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* @return void
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*
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**/
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virtual void Intersect(const nsIRegion &aRegion) = 0;
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/**
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* destructively intersect a rect with this region
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*
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* @param aX xoffset of rect to intersect with region
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* @param aY yoffset of rect to intersect with region
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* @param aWidth width of rect to intersect with region
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* @param aHeight height of rect to intersect with region
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* @return void
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*
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**/
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virtual void Intersect(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) = 0;
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/**
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* destructively union another region with this one
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*
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* @param region to union
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* @return void
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*
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**/
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virtual void Union(const nsIRegion &aRegion) = 0;
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/**
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* destructively union a rect with this region
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*
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* @param aX xoffset of rect to union with region
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* @param aY yoffset of rect to union with region
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* @param aWidth width of rect to union with region
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* @param aHeight height of rect to union with region
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* @return void
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*
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**/
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virtual void Union(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) = 0;
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/**
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* destructively subtract another region with this one
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*
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* @param region to subtract
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* @return void
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*
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**/
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virtual void Subtract(const nsIRegion &aRegion) = 0;
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/**
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* destructively subtract a rect from this region
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*
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* @param aX xoffset of rect to subtract with region
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* @param aY yoffset of rect to subtract with region
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* @param aWidth width of rect to subtract with region
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* @param aHeight height of rect to subtract with region
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* @return void
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*
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**/
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virtual void Subtract(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) = 0;
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/**
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* is this region empty? i.e. does it contain any pixels
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*
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* @param none
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* @return returns whether the region is empty
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*
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**/
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virtual PRBool IsEmpty(void) = 0;
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/**
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* == operator equivalent i.e. do the regions contain exactly
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* the same pixels
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*
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* @param region to compare
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* @return whether the regions are identical
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*
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**/
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virtual PRBool IsEqual(const nsIRegion &aRegion) = 0;
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/**
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* returns the bounding box of the region i.e. the smallest
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* rectangle that completely contains the region.
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*
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* @param aX out parameter for xoffset of bounding rect for region
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* @param aY out parameter for yoffset of bounding rect for region
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* @param aWidth out parameter for width of bounding rect for region
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* @param aHeight out parameter for height of bounding rect for region
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* @return void
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*
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**/
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virtual void GetBoundingBox(PRInt32 *aX, PRInt32 *aY, PRInt32 *aWidth, PRInt32 *aHeight) = 0;
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/**
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* offsets the region in x and y
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*
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* @param xoffset pixel offset in x
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* @param yoffset pixel offset in y
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* @return void
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*
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**/
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virtual void Offset(PRInt32 aXOffset, PRInt32 aYOffset) = 0;
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/**
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* does the region intersect the rectangle?
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*
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* @param rect to check for containment
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* @return true if the region intersects the rect
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*
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**/
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virtual PRBool ContainsRect(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) = 0;
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/**
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* get the set of rects which make up this region. the aRects
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* parameter must be freed by calling FreeRects before the region
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* is deleted. aRects may be passed in again when requesting
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* the rect list as a recycling method.
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*
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* @param aRects out parameter containing set of rects
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* comprising the region
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* @return error status
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*
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**/
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NS_IMETHOD GetRects(nsRegionRectSet **aRects) = 0;
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/**
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* Free a rect set returned by GetRects.
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*
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* @param aRects rects to free
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* @return error status
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*
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**/
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NS_IMETHOD FreeRects(nsRegionRectSet *aRects) = 0;
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/**
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* Get the native region that this nsIRegion represents.
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* @param aRegion out parameter for native region handle
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* @return error status
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**/
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NS_IMETHOD GetNativeRegion(void *&aRegion) const = 0;
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/**
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* Get the complexity of the region as defined by the
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* nsRegionComplexity enum.
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* @param aComplexity out parameter for region complexity
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* @return error status
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**/
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NS_IMETHOD GetRegionComplexity(nsRegionComplexity &aComplexity) const = 0;
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/**
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* get the number of rects which make up this region.
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*
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* @param aRects out parameter containing the number of rects
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* comprising the region
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* @return error status
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*
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**/
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NS_IMETHOD GetNumRects(PRUint32 *aRects) const = 0;
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};
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#endif // nsIRegion_h___
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