1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/graphics/graphicsdeviceinterface/bitgdi/sbit/ELLIPSE.CPP Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,405 @@
1.4 +// Copyright (c) 1997-2009 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 <bitstd.h>
1.20 +#include <bitdev.h>
1.21 +#include "BITPANIC.H"
1.22 +#include <bitdraw.h>
1.23 +#include <graphics/fbsrasterizer.h>
1.24 +
1.25 +/*
1.26 + * TEllipse
1.27 + */
1.28 +
1.29 + /**
1.30 + Initialises the values of the ellipse so that it conforms to a rectangle entered as a parameter.
1.31 + @param aRect the rectangle within which the ellipse is drawn
1.32 + */
1.33 +EXPORT_C void TEllipse::Construct(const TRect& aRect)
1.34 + {
1.35 + TInt width=aRect.Width();
1.36 + TInt height=aRect.Height();
1.37 + iA=(width-1)>>1;
1.38 + iB=(height-1)>>1;
1.39 + iXAdj=(width+1)&1;
1.40 + iYAdj=(height+1)&1;
1.41 + iOffset=aRect.iTl;
1.42 + iX=0;
1.43 + iY=iB;
1.44 + iASquared=iA*iA;
1.45 + iBSquared=iB*iB;
1.46 + iASquBSqu=iASquared*iBSquared;
1.47 + iD1=iBSquared-iASquared*iB+(iASquared>>1);
1.48 + if(width<=0 || height<=0)
1.49 + iStatus=EComplete;
1.50 + else if(width<=2 || height<=2)
1.51 + iStatus=ELine;
1.52 + else if(iA+iXAdj==0 || iB+iYAdj==0)
1.53 + iStatus=EComplete;
1.54 + else
1.55 + iStatus=EInitialised;
1.56 + }
1.57 +
1.58 +/**
1.59 +Does the next stage in producing an ellipse by taking four points (the corners of
1.60 +the rectangle the ellipse should fill) as parameters. Updates TEllipse status
1.61 +accordingly and calls <code>Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight)</code>.
1.62 +@param aTopLeft Top left corner of rectangle
1.63 +@param aTopRight Top right corner of rectangle
1.64 +@param aBottomLeft Bottom left corner of rectangle
1.65 +@param aBottomRight Bottom right corner of rectangle
1.66 +@return TBool ETrue if step completed successfully.
1.67 +*/
1.68 +EXPORT_C TBool TEllipse::SingleStep(TPoint& aTopLeft,TPoint& aTopRight,
1.69 + TPoint& aBottomLeft,TPoint& aBottomRight)
1.70 + {
1.71 + TBool ret=EFalse;
1.72 + if(iStatus==EFirstSector)
1.73 + {
1.74 + if(iD1<0)
1.75 + iD1+=iBSquared*((iX<<1)+3);
1.76 + else if(iY>0)
1.77 + {
1.78 + iD1+=iBSquared*((iX<<1)+3)+iASquared*(2-(iY<<1));
1.79 + iY--;
1.80 + }
1.81 + iX++;
1.82 + ret=Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
1.83 + if(iStatus==EComplete && iX<iA)
1.84 + {
1.85 + iStatus=EFirstSector;
1.86 + return(EFalse);
1.87 + }
1.88 + if(iASquared*iY<=iBSquared*(iX+1) && ret==EFalse)
1.89 + {
1.90 + iStatus=ESecondSector;
1.91 + iD2=-iASquBSqu+iBSquared*iX*iX+iASquared*(iY-1)*(iY-1);
1.92 + }
1.93 + return(ret);
1.94 + }
1.95 + if(iStatus==ESecondSector)
1.96 + {
1.97 + if(iD2<0)
1.98 + {
1.99 + iD2+=iBSquared*((iX<<1)+2)+iASquared*(3-(iY<<1));
1.100 + iX++;
1.101 + }
1.102 + else
1.103 + iD2+=iASquared*(3-(iY<<1));
1.104 + iY--;
1.105 + return(Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
1.106 + }
1.107 + if(iStatus==ELine)
1.108 + {
1.109 + ret=Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
1.110 + if(iA==0)
1.111 + iY--;
1.112 + else
1.113 + {
1.114 + iX++;
1.115 + if(iX>iA+iXAdj) ret=ETrue;
1.116 + else
1.117 + {
1.118 + iStatus=ELine;
1.119 + ret=EFalse;
1.120 + }
1.121 + }
1.122 + return(ret);
1.123 + }
1.124 + if(iStatus==EInitialised)
1.125 + {
1.126 + iStatus=EFirstSector;
1.127 + return(Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
1.128 + }
1.129 + Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
1.130 + return(ETrue);
1.131 + }
1.132 +
1.133 +/**
1.134 +Sets the absolute points that define the ellipse as calculated using its iOffset
1.135 +from the origin and using the half width and half height of the rectangle iA and iB.
1.136 +@param aTopLeft The absolute (x,y) position for the top left point.
1.137 +@param aTopRight The absolute (x,y) position for the top right point.
1.138 +@param aBottomLeft The absolute (x,y) position for the bottom left point.
1.139 +@param aBottomRight The absolute (x,y) position for the bottom right point.
1.140 +@return TBool ETrue if a valid rectangle is produced, else EFalse. Also sets
1.141 +iStatus to EComplete.
1.142 +*/
1.143 +EXPORT_C TBool TEllipse::Output(TPoint& aTopLeft,TPoint& aTopRight,
1.144 + TPoint& aBottomLeft,TPoint& aBottomRight)
1.145 + {
1.146 + TInt lx=iA-iX+iOffset.iX;
1.147 + TInt ty=iB-iY+iOffset.iY;
1.148 + TInt rx=iA+iX+iXAdj+iOffset.iX;
1.149 + TInt by=iB+iY+iYAdj+iOffset.iY;
1.150 + aTopLeft.SetXY(lx,ty);
1.151 + aTopRight.SetXY(rx,ty);
1.152 + aBottomLeft.SetXY(lx,by);
1.153 + aBottomRight.SetXY(rx,by);
1.154 + if(iY<=0)
1.155 + {
1.156 + iStatus=EComplete;
1.157 + if(iYAdj==0 || ty>by)
1.158 + return(ETrue);
1.159 + }
1.160 + return(EFalse);
1.161 + }
1.162 +
1.163 +/**
1.164 +By analysing the current state of the ellipse the process is taken to the next appropriate step.
1.165 +If iStatus = EInitialised only one step will be taken, if the ellipse is already semi constructed then
1.166 +it will be taken to completion. Takes in four point parameters that defines the rectangle in order to pass to
1.167 +SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight).
1.168 +@param aTopLeft Top left corner of rectangle
1.169 +@param aTopRight Top right corner of rectangle
1.170 +@param aBottomLeft Bottom left corner of rectangle
1.171 +@param aBottomRight Bottom right corner of rectangle
1.172 +@return TBool ETrue if a valid rectangle is produced, else EFalse.
1.173 +*/
1.174 +EXPORT_C TBool TEllipse::NextStep(TPoint& aTopLeft,TPoint& aTopRight,
1.175 + TPoint& aBottomLeft,TPoint& aBottomRight)
1.176 + {
1.177 + if(iStatus==EInitialised)
1.178 + return(SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight));
1.179 + TInt prevlev=iY;
1.180 + TBool ret;
1.181 + do
1.182 + ret=SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight);
1.183 + while(prevlev==iY && ret==EFalse);
1.184 + return(ret);
1.185 + }
1.186 +
1.187 +/**
1.188 +Constructs an ellipse from the rectangle which it is given and assesses the
1.189 +points position with regard to the ellipse and where they intersect.
1.190 +@param aRect The rectangle within which the ellipse is drawn.
1.191 +@param aPoint A point to compare with the ellipse to determine if intersection occurs.
1.192 +@return TPoint The point is set to the corner which the intersection is nearest to.
1.193 +*/
1.194 +EXPORT_C TPoint TEllipse::Intersection(const TRect& aRect,const TPoint& aPoint)
1.195 + {
1.196 + Construct(aRect); //constructs the rect (an elipse object)
1.197 + TPoint centre=aRect.Center(); //centre of ellipse
1.198 + TPoint ptcpy(aPoint);
1.199 + ptcpy-=iOffset; //ptcpy = aPoint - iOffset - TPoint(iA,iB) //radius from centre of ellipse
1.200 + ptcpy-=TPoint(iA,iB);
1.201 + TPoint pt[4],opt[4];
1.202 + TInt mpt[4],ompt[4];
1.203 + TInt count=0;
1.204 + for(;count<4;count++)
1.205 + ompt[count]=KMaxTInt; //fills ompt 1->4 with KMaxTInt
1.206 + while(SingleStep(pt[0],pt[1],pt[2],pt[3])==EFalse) //creates a complete ellipse with pts as rect
1.207 + for(count=0;count<4;count++)
1.208 + {
1.209 + mpt[count]=Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA));
1.210 + if(mpt[count]<ompt[count]) //use the larger number set.
1.211 + {
1.212 + ompt[count]=mpt[count];
1.213 + opt[count]=pt[count];
1.214 + }
1.215 + }
1.216 + if(pt[0].iY==pt[2].iY) //if it is horizontal
1.217 + for(count=0;count<4;count++)
1.218 + {
1.219 + mpt[count]=Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA));
1.220 + if(mpt[count]<ompt[count]) //use the larger number set.
1.221 + {
1.222 + ompt[count]=mpt[count];
1.223 + opt[count]=pt[count];
1.224 + }
1.225 + }
1.226 + if(ptcpy.iX<0 && ptcpy.iY<0) //if point is further left and higher than centre of rect
1.227 + return(opt[0]);
1.228 + if(ptcpy.iY<0) //if point is higher than centre of rect
1.229 + return(opt[1]);
1.230 + if(ptcpy.iX<0) //if point is further left than centre of rect
1.231 + return(opt[2]);
1.232 + if(aPoint.iX<centre.iX && aPoint.iY<centre.iY) //if point is further left and higher than centre of rect
1.233 + return(opt[0]);
1.234 + if(aPoint.iY<centre.iY) //if point is higher than centre of rect
1.235 + return(opt[1]);
1.236 + if(aPoint.iX<centre.iX) //if point is further left than centre of rect
1.237 + return(opt[2]);
1.238 + return(opt[3]); //else
1.239 + }
1.240 +
1.241 +//
1.242 +// Ellipse drawing
1.243 +//
1.244 +
1.245 +/**
1.246 +Draws and fills an ellipse.
1.247 +
1.248 +The function provides a concrete implementation of the pure virtual
1.249 +function <code>CGraphicsContext::DrawEllipse()</code>. The function
1.250 +behaviour is the same as documented in that class.
1.251 +*/
1.252 +EXPORT_C void CFbsBitGc::DrawEllipse(const TRect& aRect)
1.253 + {
1.254 + if(CheckDevice(aRect)) return;
1.255 + TRect rcpy(aRect);
1.256 + rcpy.Move(iOrigin);
1.257 + iDevice->TruncateRect(rcpy);
1.258 + TRect clippedRect(rcpy);
1.259 + clippedRect.Grow((iPenSize.iWidth>>1)+1,(iPenSize.iHeight>>1)+1);
1.260 + if(UserClipRect(clippedRect)) return;
1.261 + SetupDevice();
1.262 + iDevice->DrawingBegin(&iBrushBitmap);
1.263 + CFbsRasterizer* brushRasterizer = PrepareRasterizerForExtendedBitmap(iBrushBitmap);
1.264 + if(iBrushStyle!=ENullBrush)
1.265 + EllipseFill(rcpy);
1.266 + if(iPenStyle!=ENullPen)
1.267 + {
1.268 + if(iPenSize.iWidth>1 && iPenSize.iHeight>1)
1.269 + EllipseOutlineWide(rcpy);
1.270 + else
1.271 + if(iPenSize.iWidth==1 || iPenSize.iHeight==1)
1.272 + EllipseOutline(rcpy);
1.273 + }
1.274 + if (brushRasterizer)
1.275 + {
1.276 + brushRasterizer->EndBitmap(iBrushBitmap.SerialNumber());
1.277 + }
1.278 + iDevice->DrawingEnd(&iBrushBitmap);
1.279 + }
1.280 +
1.281 +void CFbsBitGc::EllipseOutline(const TRect& aRect)
1.282 + {
1.283 + CFbsDrawDevice* drawDevice = iDevice->iDrawDevice;
1.284 + TPoint tl,tr,bl,br;
1.285 + AddRect(aRect);
1.286 +#if defined(_DEBUG)
1.287 + TRect deviceDestRect;
1.288 + drawDevice->GetDrawRect(deviceDestRect);
1.289 +#endif
1.290 + for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
1.291 + {
1.292 + iClipRect=(*iDefaultRegionPtr)[count];
1.293 + if(!iClipRect.Intersects(aRect))
1.294 + continue;
1.295 + iClipRect.Intersection(aRect);
1.296 + if(UserClipRect(iClipRect)) continue;
1.297 + BG_ASSERT_DEBUG(iClipRect.iTl.iX >= deviceDestRect.iTl.iX, EBitgdiPanicOutOfBounds);
1.298 + BG_ASSERT_DEBUG(iClipRect.iTl.iY >= deviceDestRect.iTl.iY, EBitgdiPanicOutOfBounds);
1.299 + BG_ASSERT_DEBUG(iClipRect.iBr.iX <= deviceDestRect.iBr.iX, EBitgdiPanicOutOfBounds);
1.300 + BG_ASSERT_DEBUG(iClipRect.iBr.iY <= deviceDestRect.iBr.iY, EBitgdiPanicOutOfBounds);
1.301 + TEllipse ellipse;
1.302 + ellipse.Construct(aRect);
1.303 + TInt pattern=0;
1.304 + while(!ellipse.SingleStep(tl,tr,bl,br))
1.305 + {
1.306 + if(iPenStyle==CGraphicsContext::ESolidPen || (iDotMask&(1<<(pattern%iDotLength))))
1.307 + {
1.308 + if(tl.iY>=iClipRect.iTl.iY && tl.iY<iClipRect.iBr.iY)
1.309 + {
1.310 + if(tl.iX>=iClipRect.iTl.iX && tl.iX<iClipRect.iBr.iX)
1.311 + drawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,iDrawMode);
1.312 + if(tr.iX>=iClipRect.iTl.iX && tr.iX<iClipRect.iBr.iX && tl.iX!=tr.iX)
1.313 + drawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,iDrawMode);
1.314 + }
1.315 + if(bl.iY>=iClipRect.iTl.iY && bl.iY<iClipRect.iBr.iY)
1.316 + {
1.317 + if(bl.iX>=iClipRect.iTl.iX && bl.iX<iClipRect.iBr.iX)
1.318 + drawDevice->WriteRgb(bl.iX,bl.iY,iPenColor,iDrawMode);
1.319 + if(br.iX>=iClipRect.iTl.iX && br.iX<iClipRect.iBr.iX && bl.iX!=br.iX)
1.320 + drawDevice->WriteRgb(br.iX,br.iY,iPenColor,iDrawMode);
1.321 + }
1.322 + }
1.323 + pattern++;
1.324 + }
1.325 + if(tl.iY==bl.iY && tl.iY>=iClipRect.iTl.iY && tl.iY<iClipRect.iBr.iY)
1.326 + {
1.327 + if(tl.iX>=iClipRect.iTl.iX && tl.iX<iClipRect.iBr.iX)
1.328 + drawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,iDrawMode);
1.329 + if(tr.iX>=iClipRect.iTl.iX && tr.iX<iClipRect.iBr.iX && tl.iX!=tr.iX)
1.330 + drawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,iDrawMode);
1.331 + }
1.332 + drawDevice->UpdateRegion(iClipRect);
1.333 + }
1.334 + }
1.335 +
1.336 +void CFbsBitGc::EllipseOutlineWide(const TRect& aRect)
1.337 + {
1.338 + TRect rcpy(aRect);
1.339 + TPoint tl,tr,bl,br;
1.340 + TInt halfpenwidth=(iPenSize.iWidth+1)>>1;
1.341 + TInt halfpenheight=(iPenSize.iHeight+1)>>1;
1.342 + rcpy.Grow(halfpenwidth,halfpenheight);
1.343 + AddRect(rcpy);
1.344 + TInt dp=iDotParam;
1.345 + for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
1.346 + {
1.347 + iClipRect=(*iDefaultRegionPtr)[count];
1.348 + if(!iClipRect.Intersects(rcpy))
1.349 + continue;
1.350 + iClipRect.Intersection(rcpy);
1.351 + if(UserClipRect(iClipRect)) continue;
1.352 + TEllipse ellipse;
1.353 + ellipse.Construct(aRect);
1.354 + iDotParam=Max(iPenSize.iWidth>>1,iPenSize.iHeight>>1);
1.355 + while(!ellipse.SingleStep(tl,tr,bl,br))
1.356 + {
1.357 + PenDrawClipped(tl);
1.358 + PenDrawClipped(tr);
1.359 + PenDrawClipped(bl);
1.360 + PenDrawClipped(br);
1.361 + iDotParam+=iDotDirection;
1.362 + }
1.363 + if(tl.iY==bl.iY)
1.364 + {
1.365 + PenDrawClipped(tl);
1.366 + PenDrawClipped(tr);
1.367 + }
1.368 + iDevice->iDrawDevice->UpdateRegion(iClipRect);
1.369 + }
1.370 + iDotParam=dp;
1.371 + }
1.372 +
1.373 +// if iBrushBitmap is an extended bitmap, PrepareRasterizerForExtendedBitmap() must have been called before this method
1.374 +void CFbsBitGc::EllipseFill(const TRect& aRect)
1.375 + {
1.376 + TRect rcpy(aRect);
1.377 + if(iPenSize.iWidth==0 || iPenSize.iHeight==0)
1.378 + rcpy.Grow(1,1);
1.379 + AddRect(aRect);
1.380 + TPoint tl,tr,bl,br;
1.381 + for(TInt count=0;count<iDefaultRegionPtr->Count();count++)
1.382 + {
1.383 + iClipRect=(*iDefaultRegionPtr)[count];
1.384 + if(!iClipRect.Intersects(rcpy))
1.385 + continue;
1.386 + iClipRect.Intersection(rcpy);
1.387 + if(UserClipRect(iClipRect)) continue;
1.388 + TEllipse ellipse;
1.389 + ellipse.Construct(rcpy);
1.390 + while(!ellipse.NextStep(tl,tr,bl,br))
1.391 + {
1.392 + tl.iX++;
1.393 + tr.iX--;
1.394 + bl.iX++;
1.395 + br.iX--;
1.396 + ClipFillLine(tl,tr);
1.397 + ClipFillLine(bl,br);
1.398 + }
1.399 + if(tl.iY==bl.iY)
1.400 + {
1.401 + tl.iX++;
1.402 + tr.iX--;
1.403 + ClipFillLine(tl,tr);
1.404 + }
1.405 + iDevice->iDrawDevice->UpdateRegion(iClipRect);
1.406 + }
1.407 + }
1.408 +