author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 16:19:02 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002 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: Graphics Extension Library source file |
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* |
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*/ |
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|
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|
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#include "GfxPolygonRendererP.h" |
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#include "GfxPaint.h" |
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#include "GfxColor.h" |
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#include "GfxRendererInfoP.h" |
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#include "GfxEdgeListP.h" |
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|
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|
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// --------------------------------------------------------------------------- |
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// Constructor |
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// --------------------------------------------------------------------------- |
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// -------------------------------------------------------------------------- |
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// TGfxPolygonRendererP::TGfxPolygonRendererP() |
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// --------------------------------------------------------------------------- |
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TGfxPolygonRendererP::TGfxPolygonRendererP() |
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{ |
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} |
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|
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// -------------------------------------------------------------------------- |
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// void TGfxPolygonRendererP::InitializeP( CGfxEdgeListP* aEdgeList, |
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// --------------------------------------------------------------------------- |
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void TGfxPolygonRendererP::InitializeP( CGfxEdgeListP* aEdgeList, |
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TGfxRendererInfoP* aRenderInfo, |
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MGfxPaint* aPaint, |
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TBool aWindingNoneZero ) |
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{ |
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iEdgeList = aEdgeList; |
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iRenderInfo = aRenderInfo; |
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iPaint = aPaint; |
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iWindingNoneZero = aWindingNoneZero; |
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} |
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// -------------------------------------------------------------------------- |
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// void TGfxPolygonRendererP::RenderScanlineL( TInt aY, TUint32 /* aAlpha */ ) |
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// --------------------------------------------------------------------------- |
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void TGfxPolygonRendererP::RenderScanlineL( TInt aY, TUint32 /* aAlpha */ ) |
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{ |
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if ( iRenderInfo->iClipMinY >= aY || aY > iRenderInfo->iClipMaxY ) |
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return; |
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TInt edgeCount = iEdgeList->iEdgesCount; |
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TGfxSegEdge dummyEdge; |
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dummyEdge.iEnd = -1; // less than 0 |
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dummyEdge.iSign = 100; // neither -1, 0, or 1 |
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|
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TUint16 flatColor; |
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flatColor = TGfxColor( iPaint->FlatColor() ).ColorRgb(); |
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// ************ Buffer is 2 bytes per pixel ********** |
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TUint16* fb; |
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fb = ( ( TUint16 * ) iRenderInfo->iDstBuf ) + |
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aY * iRenderInfo->iWidth; |
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TInt i, j; |
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TInt edgeSignSum = 0; |
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TBool fill = EFalse; |
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TGfxSegEdge* lastEdge =& dummyEdge; // iEdgeList->EdgeList(); |
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TGfxSegEdge* currentEdge = iEdgeList->EdgeList(); |
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for ( i = 0; i < edgeCount; i++ ) |
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{ |
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// Fill between edges |
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TInt32 fbXmin, fbXmax; |
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if ( fill ) |
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{ |
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fbXmin = lastEdge->iStart + iEdgeList->iMinX; |
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fbXmax = currentEdge->iEnd + iEdgeList->iMinX; |
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if ( fbXmax >= iRenderInfo->iClipMinX && |
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fbXmin < iRenderInfo->iClipMaxX ) // inside clipping |
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{ |
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if ( fbXmin < iRenderInfo->iClipMinX ) |
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{ |
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fbXmin = iRenderInfo->iClipMinX; |
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} |
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if ( iRenderInfo->iClipMaxX <= fbXmax ) |
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{ |
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fbXmax = iRenderInfo->iClipMaxX - 1; |
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} |
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TUint16* fbb =& fb[fbXmin]; |
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TInt fbw = fbXmax - fbXmin; |
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if ( fbw > 10 ) |
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{ |
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DrawHLine( fbb, flatColor, fbXmin, fbw ); |
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} |
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else |
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{ |
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for ( j = fbXmin; j <= fbXmax ; j++ ) |
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*fbb++ = flatColor; |
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} |
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} |
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} // end if (fill) |
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|
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// update sum of sign and determine fill/non-fill |
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|
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if ( iWindingNoneZero ) |
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{ |
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fill = ( edgeSignSum += currentEdge->iSign ); // Non-zero rule. |
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} |
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else |
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{ |
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fill = ( ++edgeSignSum & 1 ); // Even/odd rule. |
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} |
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|
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lastEdge = currentEdge; |
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currentEdge = currentEdge->iNext; |
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} // end for i (each edges) |
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} |
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|
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|
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