author | hgs |
Fri, 30 Jul 2010 11:41:40 +0300 | |
changeset 136 | 62bb7c97884c |
parent 0 | 5d03bc08d59c |
permissions | -rw-r--r-- |
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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|
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#include <e32def.h> |
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#include "regionextend.h" |
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|
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//Only call this if certain neither rectangle is empty. |
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//Region rectangles are always non-empty |
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inline /*static*/ |
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TRegionExtend::TOverlapFlags TestDifferenceNotEmpty(const TRect& aThis,const TRect& aThat) |
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{ |
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struct SubAdd |
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{ |
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inline static TRegionExtend::TOverlapFlags Conv(TInt delta) |
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{ //returns sub, exact or add for delta of each edge pair |
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//neg --> +1 //pos --> +2 //zero ==> 0 |
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return TRegionExtend::TOverlapFlags( |
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((delta>>31)&1) +(((-delta)>>30)&2) ); |
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} |
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}; |
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//could use SubAdd for this if... |
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if ( aThis.iTl.iX>=aThat.iBr.iX |
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|| aThis.iTl.iY>=aThat.iBr.iY |
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|| aThat.iTl.iX>=aThis.iBr.iX |
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|| aThat.iTl.iY>=aThis.iBr.iY |
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) |
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return TRegionExtend::TOverlapFlags(TRegionExtend::EDiffers|TRegionExtend::ENoIntersect); |
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|
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TInt subAdd=( SubAdd::Conv(aThis.iTl.iX-aThat.iTl.iX) |
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| SubAdd::Conv(aThis.iTl.iY-aThat.iTl.iY) |
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| SubAdd::Conv(aThat.iBr.iX-aThis.iBr.iX) |
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| SubAdd::Conv(aThat.iBr.iY-aThis.iBr.iY) |
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); |
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return |
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TRegionExtend::TOverlapFlags(subAdd); |
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} |
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|
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/** Calc total area of a list of non-intersecting rectangles (ie a region) |
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* @param aThisRects the array of rectangles |
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* @param aThisCount the number in the array |
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*/ |
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inline TUint RectListArea(const TRect* aThisRects,TInt aThisCount) |
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{ |
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TInt thisArea=0; |
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for (TInt stepThis=aThisCount-1;stepThis>=0;stepThis--) |
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{ |
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TSize size=aThisRects[stepThis].Size(); |
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__ASSERT_DEBUG((size.iWidth|size.iHeight)<32768,User::Panic(_L("TRegionExtend"),4003)); |
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thisArea+=size.iWidth*size.iHeight; |
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} |
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return thisArea; |
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} |
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/** Returns the result code flag based on the calculated intersection of two areas |
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* The intersection is always less than or equal to this and that. |
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* @param aThisArea Start area |
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* @param aIntersectArea Intersection |
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* @param aThatArea Final area |
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* @return |
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* - EDiffers if both this and that differ from intersect |
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* - EExact if both this and that are same as intersect |
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* - ESub if only that is same as intersect, so this is bigger |
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* - EAdd if only this is same as intersect, so that is bigger |
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* |
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**/ |
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inline TRegionExtend::TOverlapFlags AreaDiffResults(TUint aThisArea,TUint aIntersectArea,TUint aThatArea) |
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{ |
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if (aThisArea>aIntersectArea) |
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if (aThatArea>aIntersectArea) |
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return TRegionExtend::EDiffers; |
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else |
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return TRegionExtend::ESub; |
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else |
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if (aThatArea>aIntersectArea) |
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return TRegionExtend::EAdd; |
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else |
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return TRegionExtend::EExact; |
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} |
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/** Calculates the intersection area of one rectangle with an array of non intersecting rectangles |
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* It is presumed that the caller will loop through all the cells of a target region, |
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* repeating this call for a source region, so we can add an extra optimisation |
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* to avoid revisiting any source rectangles that have been consumed completely in later passes. |
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* The simplest test is that the source cell is wholy inside the target rect. |
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* The simplest record is a bit field, but that only works up to 32 elements, then will not optimise further elements. |
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* @param aThisCount num elements in rect array |
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* @param aThisRects array of rectangles |
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* @param aThatRect intersecting rectangle |
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* @param aOptimiseThisBits record of elements of rect aray that have been fully consumed |
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100 |
* @return total intersection area |
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101 |
**/ |
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102 |
inline TUint TestDifferenceRegionInnerLoop(TInt aThisCount,const TRect* aThisRects,TRect& aThatRect,TUint& aOptimiseThisBits) |
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103 |
{ |
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104 |
TUint intersectArea=0; |
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105 |
for (TInt stepThis=aThisCount-1,bit=1;stepThis>=0;stepThis--,bit<<=1) |
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106 |
{ |
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107 |
if (!(aOptimiseThisBits&bit)) |
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108 |
{ |
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const TRect& thisRect=aThisRects[stepThis]; |
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TRegionExtend::TOverlapFlags flags=TestDifferenceNotEmpty(thisRect,aThatRect); |
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111 |
if (!(flags&TRegionExtend::ENoIntersect)) |
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112 |
{ |
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113 |
if (!(flags&TRegionExtend::EAdd)) |
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114 |
{ //Skip rest of inner loop if a containing rect is found |
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115 |
TSize size=aThatRect.Size(); |
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intersectArea+=size.iWidth*size.iHeight; |
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if (!(flags&TRegionExtend::ESub)) //equal rects... |
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118 |
{ //skip this cell for rest of outer loop if a contains rect is found |
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aOptimiseThisBits|=bit; |
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120 |
} |
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break; //this cell contains the target rect so don't bother checking any more |
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122 |
} |
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123 |
else |
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if (!(flags&TRegionExtend::ESub)) |
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125 |
{ //skip this cell for rest of outer loop if a contains rect is found |
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aOptimiseThisBits|=bit; |
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TSize size=thisRect.Size(); |
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intersectArea+=size.iWidth*size.iHeight; |
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129 |
} |
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130 |
else |
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131 |
{ |
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132 |
TRect intersect=thisRect; |
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intersect.Intersection(aThatRect); |
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TSize size=intersect.Size(); |
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intersectArea+=size.iWidth*size.iHeight; |
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136 |
} |
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137 |
} |
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138 |
} |
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139 |
} |
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return intersectArea; |
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141 |
} |
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142 |
/** Avoids the use of a temp region by performing area calc on the fly. |
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143 |
* If both regions are empty then EOverlapNoIntersect only is returned. |
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* @param aThat target region |
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* @return flags from TOverlapFlags enumeration |
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* - EExact =0 if rgions are exactly identical |
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* - ESub Flagged if some rectangles are removed converting current region to that target |
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* - EAdd Flagged if some rectangles are added converting current region to that target |
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149 |
* - ENoIntersect if there is no common region between the current region and that target |
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* - EErrorRegion One of the regions is signalling CheckError() |
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151 |
**/ |
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152 |
TRegionExtend::TOverlapFlags TRegionExtend::TestDifference(const TRegion& aThat)const |
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153 |
{ |
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TInt intersectArea=0; |
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TInt thisArea=0; |
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TInt thatArea=0; |
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const TRect* thisRects=RectangleList(); |
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const TRect* thatRects=aThat.RectangleList(); |
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TInt thatCount=aThat.Count(); |
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TInt thisCount=Count(); |
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161 |
|
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162 |
if (CheckError()||aThat.CheckError()) |
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return EErrorRegion; |
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164 |
if (thisCount==0) |
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if (thatCount==0) |
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return ENoIntersect; |
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167 |
else |
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return TOverlapFlags(ENoIntersect|EAdd); |
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//both regions are populated. How big is the intersection? |
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//The following optimisation bit is that |
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//if any rect is fully contained by a rect in the opposite region |
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//then further compares against that rect are skipped. For this, inner loop is skipped immediately |
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173 |
//Can track the first 32 rects of aThat. The remainder won't benefit from the optimisation |
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174 |
TUint optimiseThisBits=0; |
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175 |
for (TInt stepThat=thatCount-1;stepThat>=0;stepThat--) |
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176 |
{ |
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TRect thatRect=thatRects[stepThat]; |
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178 |
intersectArea+=TestDifferenceRegionInnerLoop(thisCount,thisRects,thatRect,optimiseThisBits); |
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179 |
} |
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if (intersectArea==0) |
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181 |
if (thatCount==0) |
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182 |
return TOverlapFlags(ENoIntersect|ESub); |
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183 |
else |
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184 |
return TOverlapFlags(ENoIntersect|EAdd|ESub); |
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185 |
thatArea=RectListArea(thatRects,thatCount); |
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186 |
thisArea=RectListArea(thisRects,thisCount); |
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187 |
return AreaDiffResults( thisArea, intersectArea, thatArea ); |
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188 |
} |
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189 |
|
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190 |
/** Avoids the use of a temp region by performing area calc on the fly. |
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191 |
* This version further optimises the process by avoiding the client having to re-origin either region. |
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192 |
* If both regions are empty then EOverlapNoIntersect only is returned. |
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193 |
* @param aThat target region |
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194 |
* @return flags from TOverlapFlags enumeration |
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195 |
* - EExact =0 if rgions are exactly identical |
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196 |
* - ESub Flagged if some rectangles are removed converting current region to that target |
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197 |
* - EAdd Flagged if some rectangles are added converting current region to that target |
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198 |
* - ENoIntersect if there is no common region between the current region and that target |
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199 |
* - EErrorRegion One of the regions is signalling CheckError() |
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200 |
**/ |
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TRegionExtend::TOverlapFlags TRegionExtend::TestDifference(const TRegion& aThat,TPoint aOffsetToThat)const |
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{ |
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TInt intersectArea=0; |
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TInt thisArea=0; |
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TInt thatArea=0; |
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const TRect* thisRects=RectangleList(); |
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const TRect* thatRects=aThat.RectangleList(); |
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TInt thatCount=aThat.Count(); |
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TInt thisCount=Count(); |
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210 |
|
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if (CheckError()||aThat.CheckError()) |
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return EErrorRegion; |
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if (thisCount==0) |
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if (thatCount==0) |
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return ENoIntersect; |
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216 |
else |
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return TOverlapFlags(ENoIntersect|EAdd); |
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//both regions are populated. How big is the intersection? |
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//The following optimisation bit is that |
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//if any rect is fully contained by a rect in the opposite region |
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//then further compares against that rect are skipped. For this, inner loop is skipped immediately |
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//Can track the first 32 rects of aThat. The remainder won't benefit from the optimisation |
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TUint optimiseThisBits=0; |
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for (TInt stepThat=thatCount-1;stepThat>=0;stepThat--) |
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{ |
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TRect thatRect=thatRects[stepThat]; |
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thatRect.Move(-aOffsetToThat.iX,-aOffsetToThat.iY); //this line is the only difference, but the next lump has a lot of parameters... |
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intersectArea+=TestDifferenceRegionInnerLoop(thisCount,thisRects,thatRect,optimiseThisBits); |
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} |
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if (intersectArea==0) |
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if (thatCount==0) |
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return TOverlapFlags(ENoIntersect|ESub); |
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else |
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return TOverlapFlags(ENoIntersect|EAdd|ESub); |
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235 |
|
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thatArea=RectListArea(thatRects,thatCount); |
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thisArea=RectListArea(thisRects,thisCount); |
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return AreaDiffResults( thisArea, intersectArea, thatArea ); |
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} |
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240 |
|
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/** This returns the same comparrison flags between two rectangles. |
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* Note that a zero return means exact intersection... |
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* Intended as an internal method, but there doesn't seem to be a useful public alternative. |
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* @param aThis source rectangle |
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* @param aThat target rectangle |
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* @return flags from TOverlapFlags enumeration |
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* - EExact =0 if rgions are exactly identical |
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* - ESub Flagged if some rectangles are removed converting this source rectangle to that target |
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* - EAdd Flagged if some rectangles are added converting this source rectangle to that target |
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* - ENoIntersect if there is no common region between this source rectangle and that target |
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**/ |
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TRegionExtend::TOverlapFlags TRegionExtend::TestDifference(const TRect& aThis,const TRect& aThat) |
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{ |
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254 |
if (aThis.IsEmpty()) |
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if (aThat.IsEmpty()) |
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return ENoIntersect; |
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else |
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return TOverlapFlags(EAdd|ENoIntersect); |
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else |
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if (aThat.IsEmpty()) |
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return TOverlapFlags(ESub|ENoIntersect); |
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return TestDifferenceNotEmpty(aThis,aThat); |
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} |
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264 |
|
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265 |
|
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/** Returns total area of the region |
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* @return total area |
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**/ |
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TUint TRegionExtend::Area()const |
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{ |
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return RectListArea(RectangleList(),Count()); |
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} |
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273 |
|
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/** Avoids the use of a temp region by performing area calc on the fly. |
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* If both are empty then EOverlapNoIntersect only is returned. |
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* @param aThat target rectangle |
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* @return flags from TOverlapFlags enumeration |
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* - EExact =0 if region exactly fills rectangle |
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* - ESub Flagged if some rectangles are removed converting current region to that target |
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* - EAdd Flagged if some rectangles are added converting current region to that target |
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* - ENoIntersect if there is no common region between the current region and that target |
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* - EErrorRegion One of the region is signalling CheckError() |
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**/ |
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284 |
TRegionExtend::TOverlapFlags TRegionExtend::TestDifference(const TRect& aThat)const |
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285 |
{ |
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TInt intersectArea=0; |
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const TRect* thisRects=RectangleList(); |
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TInt thisCount=Count(); |
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289 |
|
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if (aThat.IsEmpty()) |
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if (thisCount==0) |
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return ENoIntersect; |
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293 |
else |
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return TOverlapFlags(ENoIntersect|ESub); |
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if (CheckError()) |
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return EErrorRegion; |
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TInt output=ENoIntersect; |
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for (TInt stepThis=thisCount-1,bit=1;stepThis>=0;stepThis--,bit+=bit) |
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{ |
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TOverlapFlags flags=TestDifferenceNotEmpty(thisRects[stepThis],aThat); |
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if (!(flags&ENoIntersect)) |
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{ |
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if (!(flags&EAdd)) //the target rect does not add anything to this region element |
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{ //Skip rest of inner loop if a containing rect is found |
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if ((flags&ESub)||thisCount>1) |
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return ESub; //the region element is bigger or there are more region elements |
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else |
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return EExact; |
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} |
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else |
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{ |
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TRect intersect=thisRects[stepThis]; |
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intersect.Intersection(aThat); |
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TSize size=intersect.Size(); |
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__ASSERT_DEBUG((size.iWidth|size.iHeight)<32768,User::Panic(_L("TRegionExtend"),1003)); |
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intersectArea+=size.iWidth*size.iHeight; |
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|
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} |
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output&=~ENoIntersect; |
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} |
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output|=(flags&ESub); |
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} |
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if (intersectArea==0) |
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{ |
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return TOverlapFlags(output|EAdd); |
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} |
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TSize size=aThat.Size(); |
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__ASSERT_DEBUG((size.iWidth|size.iHeight)<32768,User::Panic(_L("TRegionExtend"),2003)); |
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TInt thatArea=size.iWidth*size.iHeight; |
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if (thatArea>intersectArea) |
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return TOverlapFlags(output|EAdd); |
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else |
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return TOverlapFlags(output); |
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} |
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|
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336 |