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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 <basegfx/raster/rasterconvert3d.hxx>
+#include <basegfx/vector/b2dvector.hxx>
+#include <basegfx/polygon/b3dpolygon.hxx>
+#include <basegfx/polygon/b3dpolypolygon.hxx>
+#include <basegfx/point/b3dpoint.hxx>
+
+// implementations of the 3D raster converter
+
+namespace basegfx
+{
+ void RasterConverter3D::addArea(const B3DPolygon& rFill, const B3DHomMatrix* pViewToEye)
+ {
+ const sal_uInt32 nPointCount(rFill.count());
+
+ for(sal_uInt32 a(0); a < nPointCount; a++)
+ {
+ addEdge(rFill, a, (a + 1) % nPointCount, pViewToEye);
+ }
+ }
+
+ void RasterConverter3D::addArea(const B3DPolyPolygon& rFill, const B3DHomMatrix* pViewToEye)
+ {
+ const sal_uInt32 nPolyCount(rFill.count());
+
+ for(sal_uInt32 a(0); a < nPolyCount; a++)
+ {
+ addArea(rFill.getB3DPolygon(a), pViewToEye);
+ }
+ }
+
+ RasterConverter3D::RasterConverter3D()
+ {}
+
+ RasterConverter3D::~RasterConverter3D()
+ {}
+
+ void RasterConverter3D::rasterconvertB3DArea(sal_Int32 nStartLine, sal_Int32 nStopLine)
+ {
+ if(maLineEntries.empty())
+ return;
+
+ OSL_ENSURE(nStopLine >= nStartLine, "nStopLine is bigger than nStartLine (!)");
+
+ // sort global entries by Y, X once. After this, the vector
+ // is seen as frozen. Pointers to its entries will be used in the following code.
+ std::sort(maLineEntries.begin(), maLineEntries.end());
+
+ // local parameters
+ std::vector< RasterConversionLineEntry3D >::iterator aCurrentEntry(maLineEntries.begin());
+ std::vector< RasterConversionLineEntry3D* > aCurrentLine;
+ std::vector< RasterConversionLineEntry3D* > aNextLine;
+ std::vector< RasterConversionLineEntry3D* >::iterator aRasterConversionLineEntry3D;
+
+ // get scanlines first LineNumber as start
+ sal_Int32 nLineNumber(std::max(aCurrentEntry->getY(), nStartLine));
+
+ while((!aCurrentLine.empty() || aCurrentEntry != maLineEntries.end()) && (nLineNumber < nStopLine))
+ {
+ // add all entries which start at current line to current scanline
+ while(aCurrentEntry != maLineEntries.end())
+ {
+ const sal_Int32 nCurrentLineNumber(aCurrentEntry->getY());
+
+ if(nCurrentLineNumber > nLineNumber)
+ {
+ // line is below current one, done (since array is sorted)
+ break;
+ }
+ else
+ {
+ // less or equal. Line is above or at current one. Advance it exactly to
+ // current line
+ const sal_uInt32 nStep(nLineNumber - nCurrentLineNumber);
+
+ if(!nStep || aCurrentEntry->decrementRasterConversionLineEntry3D(nStep))
+ {
+ // add when exactly on current line or when increment to it did not
+ // completely consume it
+ if(nStep)
+ {
+ aCurrentEntry->incrementRasterConversionLineEntry3D(nStep, *this);
+ }
+
+ aCurrentLine.push_back(&(*aCurrentEntry));
+ }
+ }
+
+ ++aCurrentEntry;
+ }
+
+ // sort current scanline using comparator. Only X is used there
+ // since all entries are already in one processed line. This needs to be done
+ // every time since not only new spans may have benn added or old removed,
+ // but incrementing may also have changed the order
+ std::sort(aCurrentLine.begin(), aCurrentLine.end(), lineComparator());
+
+ // process current scanline
+ aRasterConversionLineEntry3D = aCurrentLine.begin();
+ aNextLine.clear();
+ sal_uInt32 nPairCount(0);
+
+ while(aRasterConversionLineEntry3D != aCurrentLine.end())
+ {
+ RasterConversionLineEntry3D& rPrevScanRasterConversionLineEntry3D(**aRasterConversionLineEntry3D++);
+
+ // look for 2nd span
+ if(aRasterConversionLineEntry3D != aCurrentLine.end())
+ {
+ // work on span from rPrevScanRasterConversionLineEntry3D to aRasterConversionLineEntry3D, fLineNumber is valid
+ processLineSpan(rPrevScanRasterConversionLineEntry3D, **aRasterConversionLineEntry3D, nLineNumber, nPairCount++);
+ }
+
+ // increment to next line
+ if(rPrevScanRasterConversionLineEntry3D.decrementRasterConversionLineEntry3D(1))
+ {
+ rPrevScanRasterConversionLineEntry3D.incrementRasterConversionLineEntry3D(1, *this);
+ aNextLine.push_back(&rPrevScanRasterConversionLineEntry3D);
+ }
+ }
+
+ // copy back next scanline if count has changed
+ if(aNextLine.size() != aCurrentLine.size())
+ {
+ aCurrentLine = aNextLine;
+ }
+
+ // increment fLineNumber
+ nLineNumber++;
+ }
+ }
+
+ void RasterConverter3D::addEdge(const B3DPolygon& rFill, sal_uInt32 a, sal_uInt32 b, const B3DHomMatrix* pViewToEye)
+ {
+ B3DPoint aStart(rFill.getB3DPoint(a));
+ B3DPoint aEnd(rFill.getB3DPoint(b));
+ sal_Int32 nYStart(fround(aStart.getY()));
+ sal_Int32 nYEnd(fround(aEnd.getY()));
+
+ if(nYStart == nYEnd)
+ return;
+
+ if(nYStart > nYEnd)
+ {
+ std::swap(aStart, aEnd);
+ std::swap(nYStart, nYEnd);
+ std::swap(a, b);
+ }
+
+ const sal_uInt32 nYDelta(nYEnd - nYStart);
+ const double fInvYDelta(1.0 / nYDelta);
+ maLineEntries.emplace_back(
+ aStart.getX(), (aEnd.getX() - aStart.getX()) * fInvYDelta,
+ aStart.getZ(), (aEnd.getZ() - aStart.getZ()) * fInvYDelta,
+ nYStart, nYDelta);
+
+ // if extra interpolation data is used, add it to the last created entry
+ RasterConversionLineEntry3D& rEntry = maLineEntries[maLineEntries.size() - 1];
+
+ if(rFill.areBColorsUsed())
+ {
+ rEntry.setColorIndex(addColorInterpolator(rFill.getBColor(a), rFill.getBColor(b), fInvYDelta));
+ }
+
+ if(rFill.areNormalsUsed())
+ {
+ rEntry.setNormalIndex(addNormalInterpolator(rFill.getNormal(a), rFill.getNormal(b), fInvYDelta));
+ }
+
+ if(!rFill.areTextureCoordinatesUsed())
+ return;
+
+ if(pViewToEye)
+ {
+ const double fEyeA(((*pViewToEye) * aStart).getZ());
+ const double fEyeB(((*pViewToEye) * aEnd).getZ());
+
+ rEntry.setInverseTextureIndex(addInverseTextureInterpolator(
+ rFill.getTextureCoordinate(a),
+ rFill.getTextureCoordinate(b),
+ fEyeA, fEyeB, fInvYDelta));
+ }
+ else
+ {
+ rEntry.setTextureIndex(addTextureInterpolator(
+ rFill.getTextureCoordinate(a),
+ rFill.getTextureCoordinate(b),
+ fInvYDelta));
+ }
+ }
+
+ void RasterConverter3D::rasterconvertB3DEdge(const B3DPolygon& rLine, sal_uInt32 nA, sal_uInt32 nB, sal_Int32 nStartLine, sal_Int32 nStopLine, sal_uInt16 nLineWidth)
+ {
+ B3DPoint aStart(rLine.getB3DPoint(nA));
+ B3DPoint aEnd(rLine.getB3DPoint(nB));
+ const double fZBufferLineAdd(0x00ff);
+
+ if(nLineWidth > 1)
+ {
+ // this is not a hairline anymore, in most cases since it's an oversampled
+ // hairline to get e.g. AA for Z-Buffering. Create fill geometry.
+ if(!aStart.equal(aEnd))
+ {
+ reset();
+ maLineEntries.clear();
+
+ B2DVector aVector(aEnd.getX() - aStart.getX(), aEnd.getY() - aStart.getY());
+ aVector.normalize();
+ const B2DVector aPerpend(getPerpendicular(aVector) * ((static_cast<double>(nLineWidth) + 0.5) * 0.5));
+ const double fZStartWithAdd(aStart.getZ() + fZBufferLineAdd);
+ const double fZEndWithAdd(aEnd.getZ() + fZBufferLineAdd);
+
+ B3DPolygon aPolygon;
+ aPolygon.append(B3DPoint(aStart.getX() + aPerpend.getX(), aStart.getY() + aPerpend.getY(), fZStartWithAdd));
+ aPolygon.append(B3DPoint(aEnd.getX() + aPerpend.getX(), aEnd.getY() + aPerpend.getY(), fZEndWithAdd));
+ aPolygon.append(B3DPoint(aEnd.getX() - aPerpend.getX(), aEnd.getY() - aPerpend.getY(), fZEndWithAdd));
+ aPolygon.append(B3DPoint(aStart.getX() - aPerpend.getX(), aStart.getY() - aPerpend.getY(), fZStartWithAdd));
+ aPolygon.setClosed(true);
+
+ addArea(aPolygon, nullptr);
+ }
+ }
+ else
+ {
+ // it's a hairline. Use direct RasterConversionLineEntry creation to
+ // rasterconvert lines as similar to areas as possible to avoid Z-Fighting
+ sal_Int32 nYStart(fround(aStart.getY()));
+ sal_Int32 nYEnd(fround(aEnd.getY()));
+
+ if(nYStart == nYEnd)
+ {
+ // horizontal line, check X
+ const sal_Int32 nXStart(static_cast<sal_Int32>(aStart.getX()));
+ const sal_Int32 nXEnd(static_cast<sal_Int32>(aEnd.getX()));
+
+ if(nXStart != nXEnd)
+ {
+ reset();
+ maLineEntries.clear();
+
+ // horizontal line, create vertical entries. These will be sorted by
+ // X anyways, so no need to distinguish the case here
+ maLineEntries.emplace_back(
+ aStart.getX(), 0.0,
+ aStart.getZ() + fZBufferLineAdd, 0.0,
+ nYStart, 1);
+ maLineEntries.emplace_back(
+ aEnd.getX(), 0.0,
+ aEnd.getZ() + fZBufferLineAdd, 0.0,
+ nYStart, 1);
+ }
+ }
+ else
+ {
+ reset();
+ maLineEntries.clear();
+
+ if(nYStart > nYEnd)
+ {
+ std::swap(aStart, aEnd);
+ std::swap(nYStart, nYEnd);
+ }
+
+ const sal_uInt32 nYDelta(static_cast<sal_uInt32>(nYEnd - nYStart));
+ const double fInvYDelta(1.0 / nYDelta);
+
+ // non-horizontal line, create two parallel entries. These will be sorted by
+ // X anyways, so no need to distinguish the case here
+ maLineEntries.emplace_back(
+ aStart.getX(), (aEnd.getX() - aStart.getX()) * fInvYDelta,
+ aStart.getZ() + fZBufferLineAdd, (aEnd.getZ() - aStart.getZ()) * fInvYDelta,
+ nYStart, nYDelta);
+
+ RasterConversionLineEntry3D& rEntry = maLineEntries[maLineEntries.size() - 1];
+
+ // need to choose a X-Distance for the 2nd edge which guarantees all pixels
+ // of the line to be set. This is exactly the X-Increment for one Y-Step.
+ // Same is true for Z, so in both cases, add one increment to them. To also
+ // guarantee one pixel per line, add a minimum of one for X.
+ const double fDistanceX(fabs(rEntry.getX().getInc()) >= 1.0 ? rEntry.getX().getInc() : 1.0);
+
+ maLineEntries.emplace_back(
+ rEntry.getX().getVal() + fDistanceX, rEntry.getX().getInc(),
+ rEntry.getZ().getVal() + rEntry.getZ().getInc(), rEntry.getZ().getInc(),
+ nYStart, nYDelta);
+ }
+ }
+
+ if(!maLineEntries.empty())
+ {
+ rasterconvertB3DArea(nStartLine, nStopLine);
+ }
+ }
+
+ void RasterConverter3D::rasterconvertB3DPolyPolygon(const B3DPolyPolygon& rFill, const B3DHomMatrix* pViewToEye, sal_Int32 nStartLine, sal_Int32 nStopLine)
+ {
+ reset();
+ maLineEntries.clear();
+ addArea(rFill, pViewToEye);
+ rasterconvertB3DArea(nStartLine, nStopLine);
+ }
+
+ void RasterConverter3D::rasterconvertB3DPolygon(const B3DPolygon& rLine, sal_Int32 nStartLine, sal_Int32 nStopLine, sal_uInt16 nLineWidth)
+ {
+ const sal_uInt32 nPointCount(rLine.count());
+
+ if(nPointCount)
+ {
+ const sal_uInt32 nEdgeCount(rLine.isClosed() ? nPointCount : nPointCount - 1);
+
+ for(sal_uInt32 a(0); a < nEdgeCount; a++)
+ {
+ rasterconvertB3DEdge(rLine, a, (a + 1) % nPointCount, nStartLine, nStopLine, nLineWidth);
+ }
+ }
+ }
+} // end of namespace basegfx
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */