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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
*/
#include <algorithm>
#include <tools/debug.hxx>
#include <tools/helpers.hxx>
#include <osl/diagnose.hxx>
#include "regband.hxx"
// ImplRegionBand
// Each band contains all rectangles between upper and lower border.
// For Union, Intersect, Xor and Exclude operations rectangles of
// equal height are evaluated. The borders of the bands should always
// be chosen such that this is possible.
// If possible, rectangles within the bands are condensed.
// When converting polygons all points of the polygon are registered
// in the individual bands (for each band they are stored as
// points in a list). After registration of these points they are
// converted to rectangles and the points in the list are deleted.
ImplRegionBand::ImplRegionBand( long nTop, long nBottom )
{
// save boundaries
mnYTop = nTop;
mnYBottom = nBottom;
// initialize lists
mpNextBand = nullptr;
mpPrevBand = nullptr;
mpFirstSep = nullptr;
mpFirstBandPoint = nullptr;
mbTouched = false;
}
ImplRegionBand::ImplRegionBand(
const ImplRegionBand& rRegionBand,
const bool bIgnorePoints)
{
// copy boundaries
mnYTop = rRegionBand.mnYTop;
mnYBottom = rRegionBand.mnYBottom;
mbTouched = rRegionBand.mbTouched;
// initialisation
mpNextBand = nullptr;
mpPrevBand = nullptr;
mpFirstSep = nullptr;
mpFirstBandPoint = nullptr;
// copy all elements of the list with separations
ImplRegionBandSep* pNewSep;
ImplRegionBandSep* pPrevSep = nullptr;
ImplRegionBandSep* pSep = rRegionBand.mpFirstSep;
while ( pSep )
{
// create new and copy data
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = pSep->mnXLeft;
pNewSep->mnXRight = pSep->mnXRight;
pNewSep->mbRemoved = pSep->mbRemoved;
pNewSep->mpNextSep = nullptr;
if ( pSep == rRegionBand.mpFirstSep )
mpFirstSep = pNewSep;
else
pPrevSep->mpNextSep = pNewSep;
pPrevSep = pNewSep;
pSep = pSep->mpNextSep;
}
if ( ! bIgnorePoints)
{
// Copy points.
ImplRegionBandPoint* pPoint = rRegionBand.mpFirstBandPoint;
ImplRegionBandPoint* pPrevPointCopy = nullptr;
while (pPoint != nullptr)
{
ImplRegionBandPoint* pPointCopy = new ImplRegionBandPoint;
pPointCopy->mpNextBandPoint = nullptr;
pPointCopy->mnX = pPoint->mnX;
pPointCopy->mnLineId = pPoint->mnLineId;
pPointCopy->mbEndPoint = pPoint->mbEndPoint;
pPointCopy->meLineType = pPoint->meLineType;
if (pPrevPointCopy != nullptr)
pPrevPointCopy->mpNextBandPoint = pPointCopy;
else
mpFirstBandPoint = pPointCopy;
pPrevPointCopy = pPointCopy;
pPoint = pPoint->mpNextBandPoint;
}
}
}
ImplRegionBand::~ImplRegionBand()
{
SAL_WARN_IF( mpFirstBandPoint != nullptr, "vcl", "ImplRegionBand::~ImplRegionBand -> pointlist not empty" );
// delete elements of the list
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
ImplRegionBandSep* pTempSep = pSep->mpNextSep;
delete pSep;
pSep = pTempSep;
}
// delete elements of the list
ImplRegionBandPoint* pPoint = mpFirstBandPoint;
while ( pPoint )
{
ImplRegionBandPoint* pTempPoint = pPoint->mpNextBandPoint;
delete pPoint;
pPoint = pTempPoint;
}
}
// generate separations from lines and process union with existing
// separations
void ImplRegionBand::ProcessPoints()
{
// check Pointlist
ImplRegionBandPoint* pRegionBandPoint = mpFirstBandPoint;
while ( pRegionBandPoint )
{
// within list?
if ( pRegionBandPoint->mpNextBandPoint )
{
// start/stop?
if ( pRegionBandPoint->mbEndPoint && pRegionBandPoint->mpNextBandPoint->mbEndPoint )
{
// same direction? -> remove next point!
if ( pRegionBandPoint->meLineType == pRegionBandPoint->mpNextBandPoint->meLineType )
{
ImplRegionBandPoint* pSaveRegionBandPoint = pRegionBandPoint->mpNextBandPoint;
pRegionBandPoint->mpNextBandPoint = pRegionBandPoint->mpNextBandPoint->mpNextBandPoint;
delete pSaveRegionBandPoint;
}
}
}
// continue with next element in the list
pRegionBandPoint = pRegionBandPoint->mpNextBandPoint;
}
pRegionBandPoint = mpFirstBandPoint;
while ( pRegionBandPoint && pRegionBandPoint->mpNextBandPoint )
{
Union( pRegionBandPoint->mnX, pRegionBandPoint->mpNextBandPoint->mnX );
ImplRegionBandPoint* pNextBandPoint = pRegionBandPoint->mpNextBandPoint->mpNextBandPoint;
// remove already processed points
delete pRegionBandPoint->mpNextBandPoint;
delete pRegionBandPoint;
// continue with next element in the list
pRegionBandPoint = pNextBandPoint;
}
// remove last element if necessary
delete pRegionBandPoint;
// list is now empty
mpFirstBandPoint = nullptr;
}
// generate separations from lines and process union with existing
// separations
bool ImplRegionBand::InsertPoint( long nX, long nLineId,
bool bEndPoint, LineType eLineType )
{
if ( !mpFirstBandPoint )
{
mpFirstBandPoint = new ImplRegionBandPoint;
mpFirstBandPoint->mnX = nX;
mpFirstBandPoint->mnLineId = nLineId;
mpFirstBandPoint->mbEndPoint = bEndPoint;
mpFirstBandPoint->meLineType = eLineType;
mpFirstBandPoint->mpNextBandPoint = nullptr;
return true;
}
// look if line already touched the band
ImplRegionBandPoint* pRegionBandPoint = mpFirstBandPoint;
ImplRegionBandPoint* pLastTestedRegionBandPoint = nullptr;
while( pRegionBandPoint )
{
if ( pRegionBandPoint->mnLineId == nLineId )
{
if ( bEndPoint )
{
if( !pRegionBandPoint->mbEndPoint )
{
// remove old band point
if( !mpFirstBandPoint->mpNextBandPoint )
{
// if we've only got one point => replace first point
pRegionBandPoint->mnX = nX;
pRegionBandPoint->mbEndPoint = true;
return true;
}
else
{
// remove current point
if( !pLastTestedRegionBandPoint )
{
// remove and delete old first point
ImplRegionBandPoint* pSaveBandPoint = mpFirstBandPoint;
mpFirstBandPoint = mpFirstBandPoint->mpNextBandPoint;
delete pSaveBandPoint;
}
else
{
// remove and delete current band point
pLastTestedRegionBandPoint->mpNextBandPoint = pRegionBandPoint->mpNextBandPoint;
delete pRegionBandPoint;
}
break;
}
}
}
else
return false;
}
// use next element
pLastTestedRegionBandPoint = pRegionBandPoint;
pRegionBandPoint = pRegionBandPoint->mpNextBandPoint;
}
// search appropriate position and insert point into the list
ImplRegionBandPoint* pNewRegionBandPoint;
pRegionBandPoint = mpFirstBandPoint;
pLastTestedRegionBandPoint = nullptr;
while ( pRegionBandPoint )
{
// new point completely left? -> insert as first point
if ( nX <= pRegionBandPoint->mnX )
{
pNewRegionBandPoint = new ImplRegionBandPoint;
pNewRegionBandPoint->mnX = nX;
pNewRegionBandPoint->mnLineId = nLineId;
pNewRegionBandPoint->mbEndPoint = bEndPoint;
pNewRegionBandPoint->meLineType = eLineType;
pNewRegionBandPoint->mpNextBandPoint = pRegionBandPoint;
// connections to the new point
if ( !pLastTestedRegionBandPoint )
mpFirstBandPoint = pNewRegionBandPoint;
else
pLastTestedRegionBandPoint->mpNextBandPoint = pNewRegionBandPoint;
return true;
}
// use next element
pLastTestedRegionBandPoint = pRegionBandPoint;
pRegionBandPoint = pRegionBandPoint->mpNextBandPoint;
}
// not inserted -> add to the end of the list
pNewRegionBandPoint = new ImplRegionBandPoint;
pNewRegionBandPoint->mnX = nX;
pNewRegionBandPoint->mnLineId = nLineId;
pNewRegionBandPoint->mbEndPoint = bEndPoint;
pNewRegionBandPoint->meLineType = eLineType;
pNewRegionBandPoint->mpNextBandPoint = nullptr;
// connections to the new point
pLastTestedRegionBandPoint->mpNextBandPoint = pNewRegionBandPoint;
return true;
}
void ImplRegionBand::MoveX( long nHorzMove )
{
// move all x-separations
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
pSep->mnXLeft += nHorzMove;
pSep->mnXRight += nHorzMove;
pSep = pSep->mpNextSep;
}
}
void ImplRegionBand::ScaleX( double fHorzScale )
{
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
pSep->mnXLeft = FRound( pSep->mnXLeft * fHorzScale );
pSep->mnXRight = FRound( pSep->mnXRight * fHorzScale );
pSep = pSep->mpNextSep;
}
}
// combine overlapping separations
void ImplRegionBand::OptimizeBand()
{
ImplRegionBandSep* pPrevSep = nullptr;
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
// remove?
if ( pSep->mbRemoved || (pSep->mnXRight < pSep->mnXLeft) )
{
ImplRegionBandSep* pOldSep = pSep;
if ( pSep == mpFirstSep )
mpFirstSep = pSep->mpNextSep;
else
pPrevSep->mpNextSep = pSep->mpNextSep;
pSep = pSep->mpNextSep;
delete pOldSep;
continue;
}
// overlapping separations? -> combine!
if ( pSep->mpNextSep )
{
if ( (pSep->mnXRight+1) >= pSep->mpNextSep->mnXLeft )
{
if ( pSep->mpNextSep->mnXRight > pSep->mnXRight )
pSep->mnXRight = pSep->mpNextSep->mnXRight;
ImplRegionBandSep* pOldSep = pSep->mpNextSep;
pSep->mpNextSep = pOldSep->mpNextSep;
delete pOldSep;
continue;
}
}
pPrevSep = pSep;
pSep = pSep->mpNextSep;
}
}
void ImplRegionBand::Union( long nXLeft, long nXRight )
{
SAL_WARN_IF( nXLeft > nXRight, "vcl", "ImplRegionBand::Union(): nxLeft > nXRight" );
// band empty? -> add element
if ( !mpFirstSep )
{
mpFirstSep = new ImplRegionBandSep;
mpFirstSep->mnXLeft = nXLeft;
mpFirstSep->mnXRight = nXRight;
mpFirstSep->mbRemoved = false;
mpFirstSep->mpNextSep = nullptr;
return;
}
// process real union
ImplRegionBandSep* pNewSep;
ImplRegionBandSep* pPrevSep = nullptr;
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
// new separation completely inside? nothing to do!
if ( (nXLeft >= pSep->mnXLeft) && (nXRight <= pSep->mnXRight) )
return;
// new separation completely left? -> new separation!
if ( nXRight < pSep->mnXLeft )
{
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = nXLeft;
pNewSep->mnXRight = nXRight;
pNewSep->mbRemoved = false;
pNewSep->mpNextSep = pSep;
if ( pSep == mpFirstSep )
mpFirstSep = pNewSep;
else
pPrevSep->mpNextSep = pNewSep;
break;
}
// new separation overlapping from left? -> extend boundary
if ( (nXRight >= pSep->mnXLeft) && (nXLeft <= pSep->mnXLeft) )
pSep->mnXLeft = nXLeft;
// new separation overlapping from right? -> extend boundary
if ( (nXLeft <= pSep->mnXRight) && (nXRight > pSep->mnXRight) )
{
pSep->mnXRight = nXRight;
break;
}
// not inserted, but last element? -> add to the end of the list
if ( !pSep->mpNextSep && (nXLeft > pSep->mnXRight) )
{
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = nXLeft;
pNewSep->mnXRight = nXRight;
pNewSep->mbRemoved = false;
pSep->mpNextSep = pNewSep;
pNewSep->mpNextSep = nullptr;
break;
}
pPrevSep = pSep;
pSep = pSep->mpNextSep;
}
OptimizeBand();
}
void ImplRegionBand::Intersect( long nXLeft, long nXRight )
{
SAL_WARN_IF( nXLeft > nXRight, "vcl", "ImplRegionBand::Intersect(): nxLeft > nXRight" );
// band has been touched
mbTouched = true;
// band empty? -> nothing to do
if ( !mpFirstSep )
return;
// process real intersection
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
// new separation completely outside? -> remove separation
if ( (nXRight < pSep->mnXLeft) || (nXLeft > pSep->mnXRight) )
// will be removed from the optimizer
pSep->mbRemoved = true;
// new separation overlapping from left? -> reduce right boundary
if ( (nXLeft <= pSep->mnXLeft) &&
(nXRight <= pSep->mnXRight) &&
(nXRight >= pSep->mnXLeft) )
pSep->mnXRight = nXRight;
// new separation overlapping from right? -> reduce right boundary
if ( (nXLeft >= pSep->mnXLeft) &&
(nXLeft <= pSep->mnXRight) &&
(nXRight >= pSep->mnXRight) )
pSep->mnXLeft = nXLeft;
// new separation within the actual one? -> reduce both boundaries
if ( (nXLeft >= pSep->mnXLeft) && (nXRight <= pSep->mnXRight) )
{
pSep->mnXRight = nXRight;
pSep->mnXLeft = nXLeft;
}
pSep = pSep->mpNextSep;
}
OptimizeBand();
}
void ImplRegionBand::Exclude( long nXLeft, long nXRight )
{
SAL_WARN_IF( nXLeft > nXRight, "vcl", "ImplRegionBand::Exclude(): nxLeft > nXRight" );
// band has been touched
mbTouched = true;
// band empty? -> nothing to do
if ( !mpFirstSep )
return;
// process real exclusion
ImplRegionBandSep* pNewSep;
ImplRegionBandSep* pPrevSep = nullptr;
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
bool bSepProcessed = false;
// new separation completely overlapping? -> remove separation
if ( (nXLeft <= pSep->mnXLeft) && (nXRight >= pSep->mnXRight) )
{
// will be removed from the optimizer
pSep->mbRemoved = true;
bSepProcessed = true;
}
// new separation overlapping from left? -> reduce boundary
if ( !bSepProcessed )
{
if ( (nXRight >= pSep->mnXLeft) && (nXLeft <= pSep->mnXLeft) )
{
pSep->mnXLeft = nXRight+1;
bSepProcessed = true;
}
}
// new separation overlapping from right? -> reduce boundary
if ( !bSepProcessed )
{
if ( (nXLeft <= pSep->mnXRight) && (nXRight > pSep->mnXRight) )
{
pSep->mnXRight = nXLeft-1;
bSepProcessed = true;
}
}
// new separation within the actual one? -> reduce boundary
// and add new entry for reminder
if ( !bSepProcessed )
{
if ( (nXLeft >= pSep->mnXLeft) && (nXRight <= pSep->mnXRight) )
{
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = pSep->mnXLeft;
pNewSep->mnXRight = nXLeft-1;
pNewSep->mbRemoved = false;
pSep->mnXLeft = nXRight+1;
// connections from the new separation
pNewSep->mpNextSep = pSep;
// connections to the new separation
if ( pSep == mpFirstSep )
mpFirstSep = pNewSep;
else
pPrevSep->mpNextSep = pNewSep;
}
}
pPrevSep = pSep;
pSep = pSep->mpNextSep;
}
OptimizeBand();
}
void ImplRegionBand::XOr( long nXLeft, long nXRight )
{
SAL_WARN_IF( nXLeft > nXRight, "vcl", "ImplRegionBand::XOr(): nxLeft > nXRight" );
// #i46602# Reworked rectangle Xor
// In general, we can distinguish 11 cases of intersection
// (details below). The old implementation explicitly handled 7
// cases (numbered in the order of appearance, use CVS to get your
// hands on the old version), therefore, I've sticked to that
// order, and added four more cases. The code below references
// those numbers via #1, #2, etc.
// Num Mnem newX:oldX newY:oldY Description Result Can quit?
// #1 Empty band - - The band is empty, thus, simply add new bandSep just add Yes
// #2 apart - - The rectangles are disjunct, add new one as is just add Yes
// #3 atop == == The rectangles are _exactly_ the same, remove existing just remove Yes
// #4 around < > The new rectangle extends the old to both sides intersect No
// #5 left < < The new rectangle is left of the old (but intersects) intersect Yes
// #5b left-atop < == The new is left of the old, and coincides on the right intersect Yes
// #6 right > > The new is right of the old (but intersects) intersect No
// #6b right-atop == > The new is right of the old, and coincides on the left intersect No
// #7 inside > < The new is fully inside the old intersect Yes
// #8 inside-right > == The new is fully inside the old, coincides on the right intersect Yes
// #9 inside-left == < The new is fully inside the old, coincides on the left intersect Yes
// Then, to correctly perform XOr, the segment that's switched off
// (i.e. the overlapping part of the old and the new segment) must
// be extended by one pixel value at each border:
// 1 1
// 0 4 0 4
// 111100000001111
// Clearly, the leading band sep now goes from 0 to 3, and the
// trailing band sep from 11 to 14. This mimics the xor look of a
// bitmap operation.
// band empty? -> add element
if ( !mpFirstSep )
{
mpFirstSep = new ImplRegionBandSep;
mpFirstSep->mnXLeft = nXLeft;
mpFirstSep->mnXRight = nXRight;
mpFirstSep->mbRemoved = false;
mpFirstSep->mpNextSep = nullptr;
return;
}
// process real xor
ImplRegionBandSep* pNewSep;
ImplRegionBandSep* pPrevSep = nullptr;
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
long nOldLeft( pSep->mnXLeft );
long nOldRight( pSep->mnXRight );
// did the current segment actually touch the new rect? If
// not, skip all comparisons, go on, loop and try to find
// intersecting bandSep
if( nXLeft <= nOldRight )
{
if( nXRight < nOldLeft )
{
// #2
// add _before_ current bandSep
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = nXLeft;
pNewSep->mnXRight = nXRight;
pNewSep->mpNextSep = pSep;
pNewSep->mbRemoved = false;
// connections from the new separation
pNewSep->mpNextSep = pSep;
// connections to the new separation
if ( pSep == mpFirstSep )
mpFirstSep = pNewSep;
else
pPrevSep->mpNextSep = pNewSep;
pPrevSep = nullptr; // do not run accidentally into the "right" case when breaking the loop
break;
}
else if( nXLeft == nOldLeft && nXRight == nOldRight )
{
// #3
pSep->mbRemoved = true;
pPrevSep = nullptr; // do not run accidentally into the "right" case when breaking the loop
break;
}
else if( nXLeft != nOldLeft && nXRight == nOldRight )
{
// # 5b, 8
if( nXLeft < nOldLeft )
{
nXRight = nOldLeft; // 5b
}
else
{
nXRight = nXLeft; // 8
nXLeft = nOldLeft;
}
pSep->mnXLeft = nXLeft;
pSep->mnXRight = nXRight-1;
pPrevSep = nullptr; // do not run accidentally into the "right" case when breaking the loop
break;
}
else if( nXLeft == nOldLeft && nXRight != nOldRight )
{
// # 6b, 9
if( nXRight > nOldRight )
{
nXLeft = nOldRight+1; // 6b
// cannot break here, simply mark segment as removed,
// and go on with adapted nXLeft/nXRight
pSep->mbRemoved = true;
}
else
{
pSep->mnXLeft = nXRight+1; // 9
pPrevSep = nullptr; // do not run accidentally into the "right" case when breaking the loop
break;
}
}
else // if( nXLeft != nOldLeft && nXRight != nOldRight ) follows automatically
{
// #4,5,6,7
SAL_WARN_IF( nXLeft == nOldLeft || nXRight == nOldRight, "vcl",
"ImplRegionBand::XOr(): Case 4,5,6,7 expected all coordinates to be not equal!" );
// The plain-jane check would look like this:
// if( nXLeft < nOldLeft )
// {
// // #4,5
// if( nXRight > nOldRight )
// {
// // #4
// }
// else
// {
// // #5 done!
// }
// }
// else
// {
// // #6,7
// if( nXRight > nOldRight )
// {
// // #6
// }
// else
// {
// // #7 done!
// }
// }
// but since we generally don't have to care whether
// it's 4 or 6 (only that we must not stop processing
// here), condensed that in such a way that only the
// coordinates get shuffled into correct ordering.
if( nXLeft < nOldLeft )
::std::swap( nOldLeft, nXLeft );
bool bDone( false );
if( nXRight < nOldRight )
{
::std::swap( nOldRight, nXRight );
bDone = true;
}
// now, nOldLeft<nXLeft<=nOldRight<nXRight always
// holds. Note that we need the nXLeft<=nOldRight here, as
// the intersection part might be only one pixel (original
// nXLeft==nXRight)
SAL_WARN_IF( nOldLeft==nXLeft || nXLeft>nOldRight || nOldRight>=nXRight, "vcl",
"ImplRegionBand::XOr(): Case 4,5,6,7 expected coordinates to be ordered now!" );
pSep->mnXLeft = nOldLeft;
pSep->mnXRight = nXLeft-1;
nXLeft = nOldRight+1;
// nxRight is already setup correctly
if( bDone )
{
// add behind current bandSep
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = nXLeft;
pNewSep->mnXRight = nXRight;
pNewSep->mpNextSep = pSep->mpNextSep;
pNewSep->mbRemoved = false;
// connections from the new separation
pSep->mpNextSep = pNewSep;
pPrevSep = nullptr; // do not run accidentally into the "right" case when breaking the loop
break;
}
}
}
pPrevSep = pSep;
pSep = pSep->mpNextSep;
}
// new separation completely right of existing bandSeps ?
if( pPrevSep && nXLeft >= pPrevSep->mnXRight )
{
pNewSep = new ImplRegionBandSep;
pNewSep->mnXLeft = nXLeft;
pNewSep->mnXRight = nXRight;
pNewSep->mpNextSep = nullptr;
pNewSep->mbRemoved = false;
// connections from the new separation
pPrevSep->mpNextSep = pNewSep;
}
OptimizeBand();
}
bool ImplRegionBand::IsInside( long nX )
{
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep )
{
if ( (pSep->mnXLeft <= nX) && (pSep->mnXRight >= nX) )
return true;
pSep = pSep->mpNextSep;
}
return false;
}
long ImplRegionBand::GetXLeftBoundary() const
{
assert(mpFirstSep && "ImplRegionBand::XLeftBoundary -> no separation in band!");
return mpFirstSep->mnXLeft;
}
long ImplRegionBand::GetXRightBoundary() const
{
SAL_WARN_IF( mpFirstSep == nullptr, "vcl", "ImplRegionBand::XRightBoundary -> no separation in band!" );
// search last separation
ImplRegionBandSep* pSep = mpFirstSep;
while ( pSep->mpNextSep )
pSep = pSep->mpNextSep;
return pSep->mnXRight;
}
bool ImplRegionBand::operator==( const ImplRegionBand& rRegionBand ) const
{
ImplRegionBandSep* pOwnRectBandSep = mpFirstSep;
ImplRegionBandSep* pSecondRectBandSep = rRegionBand.mpFirstSep;
while ( pOwnRectBandSep && pSecondRectBandSep )
{
// get boundaries of current rectangle
long nOwnXLeft = pOwnRectBandSep->mnXLeft;
long nSecondXLeft = pSecondRectBandSep->mnXLeft;
if ( nOwnXLeft != nSecondXLeft )
return false;
long nOwnXRight = pOwnRectBandSep->mnXRight;
long nSecondXRight = pSecondRectBandSep->mnXRight;
if ( nOwnXRight != nSecondXRight )
return false;
// get next separation from current band
pOwnRectBandSep = pOwnRectBandSep->mpNextSep;
// get next separation from current band
pSecondRectBandSep = pSecondRectBandSep->mpNextSep;
}
// different number of separations?
if ( pOwnRectBandSep || pSecondRectBandSep )
return false;
return true;
}
ImplRegionBand* ImplRegionBand::SplitBand (const sal_Int32 nY)
{
OSL_ASSERT(nY>mnYTop);
OSL_ASSERT(nY<=mnYBottom);
// Create a copy of the given band (we tell the constructor to copy the points together
// with the seps.)
ImplRegionBand* pLowerBand = new ImplRegionBand(*this, false);
// Adapt vertical coordinates.
mnYBottom = nY-1;
pLowerBand->mnYTop = nY;
// Insert new band into list of bands.
pLowerBand->mpNextBand = mpNextBand;
mpNextBand = pLowerBand;
pLowerBand->mpPrevBand = this;
if (pLowerBand->mpNextBand != nullptr)
pLowerBand->mpNextBand->mpPrevBand = pLowerBand;
return pLowerBand;
}
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