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| -rw-r--r-- | basegfx/source/raster/rasterconvert3d.cxx | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/basegfx/source/raster/rasterconvert3d.cxx b/basegfx/source/raster/rasterconvert3d.cxx new file mode 100644 index 000000000..48a5c7bb5 --- /dev/null +++ b/basegfx/source/raster/rasterconvert3d.cxx @@ -0,0 +1,339 @@ +/* -*- 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() + : InterpolatorProvider3D(), + maLineEntries() + {} + + 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: */ |