| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| // MARKER(update_precomp.py): autogen include statement, do not remove |
| #include "precompiled_basegfx.hxx" |
| |
| #include <basegfx/tools/gradienttools.hxx> |
| #include <basegfx/point/b2dpoint.hxx> |
| #include <basegfx/range/b2drange.hxx> |
| #include <basegfx/matrix/b2dhommatrixtools.hxx> |
| |
| 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. |
| */ |
| 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::tools::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. |
| */ |
| 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(sqrt((fTargetSizeX * fTargetSizeX) + (fTargetSizeY * fTargetSizeY))); |
| |
| fTargetOffsetX -= (fOriginalDiag - fTargetSizeX) / 2.0; |
| fTargetOffsetY -= (fOriginalDiag - fTargetSizeY) / 2.0; |
| fTargetSizeX = fOriginalDiag; |
| fTargetSizeY = fOriginalDiag; |
| } |
| else |
| { |
| fTargetOffsetX -= (0.4142 / 2.0 ) * fTargetSizeX; |
| fTargetOffsetY -= (0.4142 / 2.0 ) * fTargetSizeY; |
| fTargetSizeX = 1.4142 * fTargetSizeX; |
| fTargetSizeY = 1.4142 * 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::tools::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((0.0 != fTargetSizeY) ? fTargetSizeX / fTargetSizeY : 1.0); |
| |
| return ODFGradientInfo(aTextureTransform, fAspectRatio, nSteps); |
| } |
| |
| /** Setup for rect & square gradient is exactly the same. Factored out |
| here. |
| */ |
| 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::tools::createRotateAroundPoint(aCenter, fAngle); |
| } |
| |
| // add defined offsets after rotation |
| if(!fTools::equal(0.5, rOffset.getX()) || !fTools::equal(0.5, rOffset.getY())) |
| { |
| // use scaled target size |
| fTargetOffsetX += (rOffset.getX() - 0.5) * fTargetSizeX; |
| fTargetOffsetY += (rOffset.getY() - 0.5) * fTargetSizeY; |
| } |
| |
| // add object translate |
| aTextureTransform.translate(fTargetOffsetX, fTargetOffsetY); |
| |
| // prepare aspect for texture |
| const double fAspectRatio((0.0 != fTargetSizeY) ? fTargetSizeX / fTargetSizeY : 1.0); |
| |
| return ODFGradientInfo(aTextureTransform, fAspectRatio, nSteps); |
| } |
| |
| namespace tools |
| { |
| 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 - sqrt(aCoor.getX() * aCoor.getX() + aCoor.getY() * 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 tools |
| } // namespace basegfx |
| |
| // eof |
