os/graphics/graphicsdeviceinterface/directgdiadaptation/swsrc/swdirectgdiellipse.cpp
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/graphics/graphicsdeviceinterface/directgdiadaptation/swsrc/swdirectgdiellipse.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,441 @@
1.4 +// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
1.5 +// All rights reserved.
1.6 +// This component and the accompanying materials are made available
1.7 +// under the terms of "Eclipse Public License v1.0"
1.8 +// which accompanies this distribution, and is available
1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
1.10 +//
1.11 +// Initial Contributors:
1.12 +// Nokia Corporation - initial contribution.
1.13 +//
1.14 +// Contributors:
1.15 +//
1.16 +// Description:
1.17 +//
1.18 +
1.19 +#include "directgdiadapter.h"
1.20 +#include "swdirectgdiellipse.h"
1.21 +#include "swdirectgdiengine.h"
1.22 +
1.23 +/*
1.24 + * TSwDirectGdiEllipse
1.25 + */
1.26 +
1.27 + /**
1.28 + Initialises the values of the ellipse so that it conforms to a rectangle entered as a parameter.
1.29 + @param aRect the rectangle within which the ellipse is drawn
1.30 + */
1.31 +void TSwDirectGdiEllipse::Construct(const TRect& aRect)
1.32 + {
1.33 + TInt width = aRect.Width();
1.34 + TInt height = aRect.Height();
1.35 + iA = (width-1) >> 1;
1.36 + iB = (height-1) >> 1;
1.37 + iXAdj = (width+1) & 1;
1.38 + iYAdj = (height+1) & 1;
1.39 + iOffset = aRect.iTl;
1.40 + iX = 0;
1.41 + iY = iB;
1.42 + iASquared = iA * iA;
1.43 + iBSquared = iB * iB;
1.44 + iASquBSqu = iASquared * iBSquared;
1.45 + iD1 = iBSquared - iASquared * iB + (iASquared>>1);
1.46 + if (width<=0 || height<=0)
1.47 + {
1.48 + iStatus = EComplete;
1.49 + }
1.50 + else if (width<=2 || height<=2)
1.51 + {
1.52 + iStatus = ELine;
1.53 + }
1.54 + else
1.55 + {
1.56 + iStatus = EInitialised;
1.57 + }
1.58 + }
1.59 +
1.60 +/**
1.61 +Does the next stage in producing an ellipse by taking four points (the corners of
1.62 +the rectangle the ellipse should fill) as parameters. Updates TSwDirectGdiEllipse status
1.63 +accordingly and calls Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight).
1.64 +
1.65 +@param aTopLeft Top left corner of rectangle.
1.66 +@param aTopRight Top right corner of rectangle.
1.67 +@param aBottomLeft Bottom left corner of rectangle.
1.68 +@param aBottomRight Bottom right corner of rectangle.
1.69 +@return TBool ETrue if step completed successfully.
1.70 +*/
1.71 +TBool TSwDirectGdiEllipse::SingleStep(TPoint& aTopLeft, TPoint& aTopRight,
1.72 + TPoint& aBottomLeft, TPoint& aBottomRight)
1.73 + {
1.74 + TBool ret = EFalse;
1.75 + if (iStatus == EFirstSector)
1.76 + {
1.77 + if (iD1 < 0)
1.78 + {
1.79 + iD1 += iBSquared * ((iX<<1)+3);
1.80 + }
1.81 + else if (iY > 0)
1.82 + {
1.83 + iD1 += iBSquared * ((iX<<1)+3) + iASquared * (2-(iY<<1));
1.84 + iY--;
1.85 + }
1.86 + iX++;
1.87 + ret = Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
1.88 + if (iStatus == EComplete && iX<iA)
1.89 + {
1.90 + iStatus = EFirstSector;
1.91 + return EFalse;
1.92 + }
1.93 + if (iASquared*iY<=iBSquared*(iX+1) && ret==EFalse)
1.94 + {
1.95 + iStatus = ESecondSector;
1.96 + iD2 =- iASquBSqu + iBSquared * iX * iX + iASquared * (iY-1) * (iY-1);
1.97 + }
1.98 + return ret;
1.99 + }
1.100 + if (iStatus == ESecondSector)
1.101 + {
1.102 + if (iD2 < 0)
1.103 + {
1.104 + iD2 += iBSquared * ((iX<<1)+2) + iASquared * (3-(iY<<1));
1.105 + iX++;
1.106 + }
1.107 + else
1.108 + {
1.109 + iD2 += iASquared * (3-(iY<<1));
1.110 + }
1.111 + iY--;
1.112 + return Output(aTopLeft, aTopRight, aBottomLeft, aBottomRight);
1.113 + }
1.114 + if (iStatus == ELine)
1.115 + {
1.116 + ret = Output(aTopLeft, aTopRight, aBottomLeft, aBottomRight);
1.117 + if (iA == 0)
1.118 + {
1.119 + iY--;
1.120 + }
1.121 + else
1.122 + {
1.123 + iX++;
1.124 + if (iX > iA+iXAdj)
1.125 + {
1.126 + ret = ETrue;
1.127 + }
1.128 + else
1.129 + {
1.130 + iStatus = ELine;
1.131 + ret = EFalse;
1.132 + }
1.133 + }
1.134 + return ret;
1.135 + }
1.136 + if (iStatus == EInitialised)
1.137 + {
1.138 + iStatus = EFirstSector;
1.139 + return Output(aTopLeft, aTopRight, aBottomLeft, aBottomRight);
1.140 + }
1.141 + Output(aTopLeft, aTopRight, aBottomLeft, aBottomRight);
1.142 + return ETrue;
1.143 + }
1.144 +
1.145 +/**
1.146 +Sets the absolute points that define the ellipse as calculated using its iOffset
1.147 +from the origin and using the half width and half height of the rectangle iA and iB.
1.148 +
1.149 +@param aTopLeft The absolute (x,y) position for the top left point.
1.150 +@param aTopRight The absolute (x,y) position for the top right point.
1.151 +@param aBottomLeft The absolute (x,y) position for the bottom left point.
1.152 +@param aBottomRight The absolute (x,y) position for the bottom right point.
1.153 +@return ETrue if a valid rectangle is produced, else EFalse. Also sets
1.154 +iStatus to EComplete.
1.155 +*/
1.156 +TBool TSwDirectGdiEllipse::Output(TPoint& aTopLeft, TPoint& aTopRight,
1.157 + TPoint& aBottomLeft, TPoint& aBottomRight)
1.158 + {
1.159 + TInt lx = iA-iX+iOffset.iX;
1.160 + TInt ty = iB-iY+iOffset.iY;
1.161 + TInt rx = iA+iX+iXAdj+iOffset.iX;
1.162 + TInt by = iB+iY+iYAdj+iOffset.iY;
1.163 + aTopLeft.SetXY(lx,ty);
1.164 + aTopRight.SetXY(rx,ty);
1.165 + aBottomLeft.SetXY(lx,by);
1.166 + aBottomRight.SetXY(rx,by);
1.167 + if (iY <= 0)
1.168 + {
1.169 + iStatus = EComplete;
1.170 + if (iYAdj==0 || ty>by)
1.171 + return ETrue;
1.172 + }
1.173 + return EFalse;
1.174 + }
1.175 +
1.176 +/**
1.177 +By analysing the current state of the ellipse the process is taken to the next appropriate step.
1.178 +If iStatus = EInitialised only one step will be taken, if the ellipse is already semi constructed then
1.179 +it will be taken to completion. Takes in four point parameters that define the rectangle in order to pass to
1.180 +SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight).
1.181 +
1.182 +@param aTopLeft Top-left corner of rectangle.
1.183 +@param aTopRight Top-right corner of rectangle.
1.184 +@param aBottomLeft Bottom-left corner of rectangle.
1.185 +@param aBottomRight Bottom-right corner of rectangle.
1.186 +@return ETrue if a valid rectangle is produced, else EFalse.
1.187 +*/
1.188 +TBool TSwDirectGdiEllipse::NextStep(TPoint& aTopLeft, TPoint& aTopRight,
1.189 + TPoint& aBottomLeft, TPoint& aBottomRight)
1.190 + {
1.191 + if(iStatus == EInitialised)
1.192 + {
1.193 + return(SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
1.194 + }
1.195 + TInt prevlev = iY;
1.196 + TBool ret;
1.197 + do
1.198 + {
1.199 + ret = SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
1.200 + }
1.201 + while (prevlev==iY && ret==EFalse);
1.202 + return ret;
1.203 + }
1.204 +
1.205 +/**
1.206 +Constructs an ellipse from the rectangle that has been added. Assesses the position of
1.207 +the points and the places where they intersect the ellipse.
1.208 +
1.209 +@param aRect The rectangle within which the ellipse is drawn.
1.210 +@param aPoint A point to compare with the ellipse to determine if intersection occurs.
1.211 +@return TPoint The point is set to the corner which the intersection is nearest to.
1.212 +*/
1.213 +TPoint TSwDirectGdiEllipse::Intersection(const TRect& aRect, const TPoint& aPoint)
1.214 + {
1.215 + Construct(aRect); //constructs the rect (an elipse object)
1.216 + TPoint centre = aRect.Center(); //centre of ellipse
1.217 + TPoint ptcpy(aPoint);
1.218 + ptcpy -= iOffset; //ptcpy = aPoint - iOffset - TPoint(iA,iB) //radius from centre of ellipse
1.219 + ptcpy -= TPoint(iA,iB);
1.220 + TPoint pt[4], opt[4];
1.221 + TInt mpt[4], ompt[4];
1.222 + TInt count = 0;
1.223 + for( ; count < 4; count++)
1.224 + {
1.225 + ompt[count]=KMaxTInt; //fills ompt 1->4 with KMaxTInt
1.226 + }
1.227 + while (SingleStep(pt[0], pt[1], pt[2], pt[3]) == EFalse) //creates a complete ellipse with pts as rect
1.228 + {
1.229 + for (count = 0; count < 4; count++)
1.230 + {
1.231 + mpt[count] = Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA));
1.232 + if (mpt[count] < ompt[count]) //use the larger number set.
1.233 + {
1.234 + ompt[count] = mpt[count];
1.235 + opt[count] = pt[count];
1.236 + }
1.237 + }
1.238 + }
1.239 + if (pt[0].iY == pt[2].iY) //if it is horizontal
1.240 + {
1.241 + for (count = 0; count < 4; count++)
1.242 + {
1.243 + mpt[count] = Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA));
1.244 + if (mpt[count] < ompt[count]) //use the larger number set.
1.245 + {
1.246 + ompt[count] = mpt[count];
1.247 + opt[count] = pt[count];
1.248 + }
1.249 + }
1.250 + }
1.251 + if (ptcpy.iX<0 && ptcpy.iY<0) //if point is further left and higher than centre of rect
1.252 + {
1.253 + return opt[0];
1.254 + }
1.255 + if (ptcpy.iY < 0) //if point is higher than centre of rect
1.256 + {
1.257 + return opt[1];
1.258 + }
1.259 + if (ptcpy.iX < 0) //if point is further left than centre of rect
1.260 + {
1.261 + return opt[2];
1.262 + }
1.263 + if (aPoint.iX<centre.iX && aPoint.iY<centre.iY) //if point is further left and higher than centre of rect
1.264 + {
1.265 + return opt[0];
1.266 + }
1.267 + if (aPoint.iY < centre.iY) //if point is higher than centre of rect
1.268 + {
1.269 + return opt[1];
1.270 + }
1.271 + if (aPoint.iX < centre.iX) //if point is further left than centre of rect
1.272 + {
1.273 + return opt[2];
1.274 + }
1.275 + return(opt[3]); //else
1.276 + }
1.277 +
1.278 +//
1.279 +// Ellipse drawing
1.280 +//
1.281 +
1.282 +/**
1.283 +@see MDirectGdiEngine::DrawEllipse()
1.284 +*/
1.285 +void CSwDirectGdiEngine::DrawEllipse(const TRect& aRect)
1.286 + {
1.287 + TRect rcpy(aRect);
1.288 + rcpy.Move(iOrigin);
1.289 + TruncateRect(rcpy);
1.290 + iBrushBitmap.BeginDataAccess();
1.291 + if(iBrushStyle!=DirectGdi::ENullBrush)
1.292 + EllipseFill(rcpy);
1.293 +
1.294 + if(iPenStyle!=DirectGdi::ENullPen)
1.295 + {
1.296 + if(iPenSize.iWidth>1 && iPenSize.iHeight>1)
1.297 + {
1.298 + EllipseOutlineWide(rcpy);
1.299 + }
1.300 + else if(iPenSize.iWidth==1 || iPenSize.iHeight==1)
1.301 + {
1.302 + EllipseOutline(rcpy);
1.303 + }
1.304 + }
1.305 + iBrushBitmap.EndDataAccess(ETrue);
1.306 + }
1.307 +
1.308 +/**
1.309 +Draws an ellipse inside the given rectangle. Current pen settings apply.
1.310 +@param aRect The rectangle in which to draw the ellipse.
1.311 +*/
1.312 +void CSwDirectGdiEngine::EllipseOutline(const TRect& aRect)
1.313 + {
1.314 + TPoint tl,tr,bl,br;
1.315 +#if defined(_DEBUG)
1.316 + TRect deviceDestRect;
1.317 + iDrawDevice->GetDrawRect(deviceDestRect);
1.318 +#endif
1.319 + TRect clipRect(0,0,0,0);
1.320 + const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode);
1.321 + for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
1.322 + {
1.323 + clipRect=(*iDefaultRegionPtr)[count];
1.324 + if(!clipRect.Intersects(aRect))
1.325 + continue;
1.326 + clipRect.Intersection(aRect);
1.327 + GRAPHICS_ASSERT_DEBUG(clipRect.iTl.iX >= deviceDestRect.iTl.iX, EDirectGdiPanicOutOfBounds);
1.328 + GRAPHICS_ASSERT_DEBUG(clipRect.iTl.iY >= deviceDestRect.iTl.iY, EDirectGdiPanicOutOfBounds);
1.329 + GRAPHICS_ASSERT_DEBUG(clipRect.iBr.iX <= deviceDestRect.iBr.iX, EDirectGdiPanicOutOfBounds);
1.330 + GRAPHICS_ASSERT_DEBUG(clipRect.iBr.iY <= deviceDestRect.iBr.iY, EDirectGdiPanicOutOfBounds);
1.331 + TSwDirectGdiEllipse ellipse;
1.332 + ellipse.Construct(aRect);
1.333 + TInt pattern=0;
1.334 + while(!ellipse.SingleStep(tl,tr,bl,br))
1.335 + {
1.336 + if(iPenStyle==DirectGdi::ESolidPen || (iDotMask&(1<<(pattern%iDotLength))))
1.337 + {
1.338 + if(tl.iY>=clipRect.iTl.iY && tl.iY<clipRect.iBr.iY)
1.339 + {
1.340 + if(tl.iX>=clipRect.iTl.iX && tl.iX<clipRect.iBr.iX)
1.341 + iDrawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,drawMode);
1.342 + if(tr.iX>=clipRect.iTl.iX && tr.iX<clipRect.iBr.iX && tl.iX!=tr.iX)
1.343 + iDrawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,drawMode);
1.344 + }
1.345 + if(bl.iY>=clipRect.iTl.iY && bl.iY<clipRect.iBr.iY)
1.346 + {
1.347 + if(bl.iX>=clipRect.iTl.iX && bl.iX<clipRect.iBr.iX)
1.348 + iDrawDevice->WriteRgb(bl.iX,bl.iY,iPenColor,drawMode);
1.349 + if(br.iX>=clipRect.iTl.iX && br.iX<clipRect.iBr.iX && bl.iX!=br.iX)
1.350 + iDrawDevice->WriteRgb(br.iX,br.iY,iPenColor,drawMode);
1.351 + }
1.352 + }
1.353 + pattern++;
1.354 + }
1.355 + if(tl.iY==bl.iY && tl.iY>=clipRect.iTl.iY && tl.iY<clipRect.iBr.iY)
1.356 + {
1.357 + if(tl.iX>=clipRect.iTl.iX && tl.iX<clipRect.iBr.iX)
1.358 + iDrawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,drawMode);
1.359 + if(tr.iX>=clipRect.iTl.iX && tr.iX<clipRect.iBr.iX && tl.iX!=tr.iX)
1.360 + iDrawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,drawMode);
1.361 + }
1.362 + iDrawDevice->UpdateRegion(clipRect);
1.363 + }
1.364 + }
1.365 +
1.366 +/**
1.367 +Draws an ellipse inside the given rectangle. Current pen settings apply.
1.368 +@param aRect The rectangle in which to draw the ellipse.
1.369 +*/
1.370 +void CSwDirectGdiEngine::EllipseOutlineWide(const TRect& aRect)
1.371 + {
1.372 + TRect rcpy(aRect);
1.373 + TPoint tl,tr,bl,br;
1.374 + TInt halfpenwidth=(iPenSize.iWidth+1)>>1;
1.375 + TInt halfpenheight=(iPenSize.iHeight+1)>>1;
1.376 + rcpy.Grow(halfpenwidth, halfpenheight);
1.377 + TInt dp=iDotParam;
1.378 + TRect clipRect(0,0,0,0);
1.379 + for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
1.380 + {
1.381 + clipRect=(*iDefaultRegionPtr)[count];
1.382 + if(!clipRect.Intersects(rcpy))
1.383 + continue;
1.384 + clipRect.Intersection(rcpy);
1.385 + TSwDirectGdiEllipse ellipse;
1.386 + ellipse.Construct(aRect);
1.387 + iDotParam=Max(iPenSize.iWidth>>1,iPenSize.iHeight>>1);
1.388 + while(!ellipse.SingleStep(tl,tr,bl,br))
1.389 + {
1.390 + PenDrawClipped(tl, clipRect);
1.391 + PenDrawClipped(tr, clipRect);
1.392 + PenDrawClipped(bl, clipRect);
1.393 + PenDrawClipped(br, clipRect);
1.394 + iDotParam+=iDotDirection;
1.395 + }
1.396 + if(tl.iY==bl.iY)
1.397 + {
1.398 + PenDrawClipped(tl, clipRect);
1.399 + PenDrawClipped(tr, clipRect);
1.400 + }
1.401 + iDrawDevice->UpdateRegion(clipRect);
1.402 + }
1.403 + iDotParam=dp;
1.404 + }
1.405 +
1.406 +/**
1.407 +Fills an ellipse inside the given rectangle. Current brush settings apply.
1.408 +@param aRect The rectangle in which to draw the ellipse.
1.409 +*/
1.410 +void CSwDirectGdiEngine::EllipseFill(const TRect& aRect)
1.411 + {
1.412 + TRect rcpy(aRect);
1.413 + if(iPenSize.iWidth==0 || iPenSize.iHeight==0)
1.414 + {
1.415 + rcpy.Grow(1,1);
1.416 + }
1.417 + TPoint tl,tr,bl,br;
1.418 + TRect clipRect(0,0,0,0);
1.419 + for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
1.420 + {
1.421 + clipRect=(*iDefaultRegionPtr)[count];
1.422 + if(!clipRect.Intersects(rcpy))
1.423 + continue;
1.424 + clipRect.Intersection(rcpy);
1.425 + TSwDirectGdiEllipse ellipse;
1.426 + ellipse.Construct(rcpy);
1.427 + while(!ellipse.NextStep(tl,tr,bl,br))
1.428 + {
1.429 + tl.iX++;
1.430 + tr.iX--;
1.431 + bl.iX++;
1.432 + br.iX--;
1.433 + ClipFillLine(tl,tr, clipRect);
1.434 + ClipFillLine(bl,br, clipRect);
1.435 + }
1.436 + if(tl.iY==bl.iY)
1.437 + {
1.438 + tl.iX++;
1.439 + tr.iX--;
1.440 + ClipFillLine(tl,tr, clipRect);
1.441 + }
1.442 + iDrawDevice->UpdateRegion(clipRect);
1.443 + }
1.444 + }