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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_DEFINE_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;
- };
-
- #endif // nsIRegion_h___
-