gecko/gfx/public/nsIRegion.h

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