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| -rw-r--r-- | basegfx/source/tools/gradienttools.cxx | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/basegfx/source/tools/gradienttools.cxx b/basegfx/source/tools/gradienttools.cxx new file mode 100644 index 000000000..c6e716510 --- /dev/null +++ b/basegfx/source/tools/gradienttools.cxx @@ -0,0 +1,472 @@ +/* -*- 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/utils/gradienttools.hxx> +#include <basegfx/point/b2dpoint.hxx> +#include <basegfx/range/b2drange.hxx> +#include <basegfx/matrix/b2dhommatrixtools.hxx> +#include <cmath> + +namespace basegfx +{ + bool ODFGradientInfo::operator==(const ODFGradientInfo& rODFGradientInfo) const + { + return getTextureTransform() == rODFGradientInfo.getTextureTransform() + && getAspectRatio() == rODFGradientInfo.getAspectRatio() + && getSteps() == rODFGradientInfo.getSteps(); + } + + const B2DHomMatrix& ODFGradientInfo::getBackTextureTransform() const + { + if(maBackTextureTransform.isIdentity()) + { + const_cast< ODFGradientInfo* >(this)->maBackTextureTransform = getTextureTransform(); + const_cast< ODFGradientInfo* >(this)->maBackTextureTransform.invert(); + } + + return maBackTextureTransform; + } + + /** Most of the setup for linear & axial gradient is the same, except + for the border treatment. Factored out here. + */ + static ODFGradientInfo init1DGradientInfo( + const B2DRange& rTargetRange, + sal_uInt32 nSteps, + double fBorder, + double fAngle, + bool bAxial) + { + B2DHomMatrix aTextureTransform; + + fAngle = -fAngle; + + double fTargetSizeX(rTargetRange.getWidth()); + double fTargetSizeY(rTargetRange.getHeight()); + double fTargetOffsetX(rTargetRange.getMinX()); + double fTargetOffsetY(rTargetRange.getMinY()); + + // add object expansion + const bool bAngleUsed(!fTools::equalZero(fAngle)); + + if(bAngleUsed) + { + const double fAbsCos(fabs(cos(fAngle))); + const double fAbsSin(fabs(sin(fAngle))); + const double fNewX(fTargetSizeX * fAbsCos + fTargetSizeY * fAbsSin); + const double fNewY(fTargetSizeY * fAbsCos + fTargetSizeX * fAbsSin); + + fTargetOffsetX -= (fNewX - fTargetSizeX) / 2.0; + fTargetOffsetY -= (fNewY - fTargetSizeY) / 2.0; + fTargetSizeX = fNewX; + fTargetSizeY = fNewY; + } + + const double fSizeWithoutBorder(1.0 - fBorder); + + if(bAxial) + { + aTextureTransform.scale(1.0, fSizeWithoutBorder * 0.5); + aTextureTransform.translate(0.0, 0.5); + } + else + { + if(!fTools::equal(fSizeWithoutBorder, 1.0)) + { + aTextureTransform.scale(1.0, fSizeWithoutBorder); + aTextureTransform.translate(0.0, fBorder); + } + } + + aTextureTransform.scale(fTargetSizeX, fTargetSizeY); + + // add texture rotate after scale to keep perpendicular angles + if(bAngleUsed) + { + const B2DPoint aCenter(0.5 * fTargetSizeX, 0.5 * fTargetSizeY); + + aTextureTransform *= basegfx::utils::createRotateAroundPoint(aCenter, fAngle); + } + + // add object translate + aTextureTransform.translate(fTargetOffsetX, fTargetOffsetY); + + // prepare aspect for texture + const double fAspectRatio(fTools::equalZero(fTargetSizeY) ? 1.0 : fTargetSizeX / fTargetSizeY); + + return ODFGradientInfo(aTextureTransform, fAspectRatio, nSteps); + } + + /** Most of the setup for radial & ellipsoidal gradient is the same, + except for the border treatment. Factored out here. + */ + static ODFGradientInfo initEllipticalGradientInfo( + const B2DRange& rTargetRange, + const B2DVector& rOffset, + sal_uInt32 nSteps, + double fBorder, + double fAngle, + bool bCircular) + { + B2DHomMatrix aTextureTransform; + + fAngle = -fAngle; + + double fTargetSizeX(rTargetRange.getWidth()); + double fTargetSizeY(rTargetRange.getHeight()); + double fTargetOffsetX(rTargetRange.getMinX()); + double fTargetOffsetY(rTargetRange.getMinY()); + + // add object expansion + if(bCircular) + { + const double fOriginalDiag(std::hypot(fTargetSizeX, fTargetSizeY)); + + fTargetOffsetX -= (fOriginalDiag - fTargetSizeX) / 2.0; + fTargetOffsetY -= (fOriginalDiag - fTargetSizeY) / 2.0; + fTargetSizeX = fOriginalDiag; + fTargetSizeY = fOriginalDiag; + } + else + { + fTargetOffsetX -= ((M_SQRT2 - 1) / 2.0 ) * fTargetSizeX; + fTargetOffsetY -= ((M_SQRT2 - 1) / 2.0 ) * fTargetSizeY; + fTargetSizeX = M_SQRT2 * fTargetSizeX; + fTargetSizeY = M_SQRT2 * fTargetSizeY; + } + + const double fHalfBorder((1.0 - fBorder) * 0.5); + + aTextureTransform.scale(fHalfBorder, fHalfBorder); + aTextureTransform.translate(0.5, 0.5); + aTextureTransform.scale(fTargetSizeX, fTargetSizeY); + + // add texture rotate after scale to keep perpendicular angles + if(!bCircular && !fTools::equalZero(fAngle)) + { + const B2DPoint aCenter(0.5 * fTargetSizeX, 0.5 * fTargetSizeY); + + aTextureTransform *= basegfx::utils::createRotateAroundPoint(aCenter, fAngle); + } + + // add defined offsets after rotation + if(!fTools::equal(0.5, rOffset.getX()) || !fTools::equal(0.5, rOffset.getY())) + { + // use original target size + fTargetOffsetX += (rOffset.getX() - 0.5) * rTargetRange.getWidth(); + fTargetOffsetY += (rOffset.getY() - 0.5) * rTargetRange.getHeight(); + } + + // add object translate + aTextureTransform.translate(fTargetOffsetX, fTargetOffsetY); + + // prepare aspect for texture + const double fAspectRatio(fTargetSizeY == 0.0 ? 1.0 : (fTargetSizeX / fTargetSizeY)); + + return ODFGradientInfo(aTextureTransform, fAspectRatio, nSteps); + } + + /** Setup for rect & square gradient is exactly the same. Factored out + here. + */ + static ODFGradientInfo initRectGradientInfo( + const B2DRange& rTargetRange, + const B2DVector& rOffset, + sal_uInt32 nSteps, + double fBorder, + double fAngle, + bool bSquare) + { + B2DHomMatrix aTextureTransform; + + fAngle = -fAngle; + + double fTargetSizeX(rTargetRange.getWidth()); + double fTargetSizeY(rTargetRange.getHeight()); + double fTargetOffsetX(rTargetRange.getMinX()); + double fTargetOffsetY(rTargetRange.getMinY()); + + // add object expansion + if(bSquare) + { + const double fSquareWidth(std::max(fTargetSizeX, fTargetSizeY)); + + fTargetOffsetX -= (fSquareWidth - fTargetSizeX) / 2.0; + fTargetOffsetY -= (fSquareWidth - fTargetSizeY) / 2.0; + fTargetSizeX = fTargetSizeY = fSquareWidth; + } + + // add object expansion + const bool bAngleUsed(!fTools::equalZero(fAngle)); + + if(bAngleUsed) + { + const double fAbsCos(fabs(cos(fAngle))); + const double fAbsSin(fabs(sin(fAngle))); + const double fNewX(fTargetSizeX * fAbsCos + fTargetSizeY * fAbsSin); + const double fNewY(fTargetSizeY * fAbsCos + fTargetSizeX * fAbsSin); + + fTargetOffsetX -= (fNewX - fTargetSizeX) / 2.0; + fTargetOffsetY -= (fNewY - fTargetSizeY) / 2.0; + fTargetSizeX = fNewX; + fTargetSizeY = fNewY; + } + + const double fHalfBorder((1.0 - fBorder) * 0.5); + + aTextureTransform.scale(fHalfBorder, fHalfBorder); + aTextureTransform.translate(0.5, 0.5); + aTextureTransform.scale(fTargetSizeX, fTargetSizeY); + + // add texture rotate after scale to keep perpendicular angles + if(bAngleUsed) + { + const B2DPoint aCenter(0.5 * fTargetSizeX, 0.5 * fTargetSizeY); + + aTextureTransform *= basegfx::utils::createRotateAroundPoint(aCenter, fAngle); + } + + // add defined offsets after rotation + if(!fTools::equal(0.5, rOffset.getX()) || !fTools::equal(0.5, rOffset.getY())) + { + // use original target size + fTargetOffsetX += (rOffset.getX() - 0.5) * rTargetRange.getWidth(); + fTargetOffsetY += (rOffset.getY() - 0.5) * rTargetRange.getHeight(); + } + + // add object translate + aTextureTransform.translate(fTargetOffsetX, fTargetOffsetY); + + // prepare aspect for texture + const double fAspectRatio(fTargetSizeY == 0.0 ? 1.0 : (fTargetSizeX / fTargetSizeY)); + + return ODFGradientInfo(aTextureTransform, fAspectRatio, nSteps); + } + + namespace utils + { + ODFGradientInfo createLinearODFGradientInfo( + const B2DRange& rTargetArea, + sal_uInt32 nSteps, + double fBorder, + double fAngle) + { + return init1DGradientInfo( + rTargetArea, + nSteps, + fBorder, + fAngle, + false); + } + + ODFGradientInfo createAxialODFGradientInfo( + const B2DRange& rTargetArea, + sal_uInt32 nSteps, + double fBorder, + double fAngle) + { + return init1DGradientInfo( + rTargetArea, + nSteps, + fBorder, + fAngle, + true); + } + + ODFGradientInfo createRadialODFGradientInfo( + const B2DRange& rTargetArea, + const B2DVector& rOffset, + sal_uInt32 nSteps, + double fBorder) + { + return initEllipticalGradientInfo( + rTargetArea, + rOffset, + nSteps, + fBorder, + 0.0, + true); + } + + ODFGradientInfo createEllipticalODFGradientInfo( + const B2DRange& rTargetArea, + const B2DVector& rOffset, + sal_uInt32 nSteps, + double fBorder, + double fAngle) + { + return initEllipticalGradientInfo( + rTargetArea, + rOffset, + nSteps, + fBorder, + fAngle, + false); + } + + ODFGradientInfo createSquareODFGradientInfo( + const B2DRange& rTargetArea, + const B2DVector& rOffset, + sal_uInt32 nSteps, + double fBorder, + double fAngle) + { + return initRectGradientInfo( + rTargetArea, + rOffset, + nSteps, + fBorder, + fAngle, + true); + } + + ODFGradientInfo createRectangularODFGradientInfo( + const B2DRange& rTargetArea, + const B2DVector& rOffset, + sal_uInt32 nSteps, + double fBorder, + double fAngle) + { + return initRectGradientInfo( + rTargetArea, + rOffset, + nSteps, + fBorder, + fAngle, + false); + } + + double getLinearGradientAlpha(const B2DPoint& rUV, const ODFGradientInfo& rGradInfo) + { + const B2DPoint aCoor(rGradInfo.getBackTextureTransform() * rUV); + + // Ignore Y, this is not needed at all for Y-Oriented gradients + // if(aCoor.getX() < 0.0 || aCoor.getX() > 1.0) + // { + // return 0.0; + // } + + if(aCoor.getY() <= 0.0) + { + return 0.0; // start value for inside + } + + if(aCoor.getY() >= 1.0) + { + return 1.0; // end value for outside + } + + const sal_uInt32 nSteps(rGradInfo.getSteps()); + + if(nSteps) + { + return floor(aCoor.getY() * nSteps) / double(nSteps - 1); + } + + return aCoor.getY(); + } + + double getAxialGradientAlpha(const B2DPoint& rUV, const ODFGradientInfo& rGradInfo) + { + const B2DPoint aCoor(rGradInfo.getBackTextureTransform() * rUV); + + // Ignore Y, this is not needed at all for Y-Oriented gradients + //if(aCoor.getX() < 0.0 || aCoor.getX() > 1.0) + //{ + // return 0.0; + //} + + const double fAbsY(fabs(aCoor.getY())); + + if(fAbsY >= 1.0) + { + return 1.0; // use end value when outside in Y + } + + const sal_uInt32 nSteps(rGradInfo.getSteps()); + + if(nSteps) + { + return floor(fAbsY * nSteps) / double(nSteps - 1); + } + + return fAbsY; + } + + double getRadialGradientAlpha(const B2DPoint& rUV, const ODFGradientInfo& rGradInfo) + { + const B2DPoint aCoor(rGradInfo.getBackTextureTransform() * rUV); + + if(aCoor.getX() < -1.0 || aCoor.getX() > 1.0 || aCoor.getY() < -1.0 || aCoor.getY() > 1.0) + { + return 0.0; + } + + const double t(1.0 - std::hypot(aCoor.getX(), aCoor.getY())); + const sal_uInt32 nSteps(rGradInfo.getSteps()); + + if(nSteps && t < 1.0) + { + return floor(t * nSteps) / double(nSteps - 1); + } + + return t; + } + + double getEllipticalGradientAlpha(const B2DPoint& rUV, const ODFGradientInfo& rGradInfo) + { + return getRadialGradientAlpha(rUV, rGradInfo); // only matrix setup differs + } + + double getSquareGradientAlpha(const B2DPoint& rUV, const ODFGradientInfo& rGradInfo) + { + const B2DPoint aCoor(rGradInfo.getBackTextureTransform() * rUV); + const double fAbsX(fabs(aCoor.getX())); + + if(fAbsX >= 1.0) + { + return 0.0; + } + + const double fAbsY(fabs(aCoor.getY())); + + if(fAbsY >= 1.0) + { + return 0.0; + } + + const double t(1.0 - std::max(fAbsX, fAbsY)); + const sal_uInt32 nSteps(rGradInfo.getSteps()); + + if(nSteps && t < 1.0) + { + return floor(t * nSteps) / double(nSteps - 1); + } + + return t; + } + + double getRectangularGradientAlpha(const B2DPoint& rUV, const ODFGradientInfo& rGradInfo) + { + return getSquareGradientAlpha(rUV, rGradInfo); // only matrix setup differs + } + } // namespace utils +} // namespace basegfx + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |