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Diffstat (limited to 'slideshow/source/engine/transitions/clippingfunctor.cxx')
| -rw-r--r-- | slideshow/source/engine/transitions/clippingfunctor.cxx | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/slideshow/source/engine/transitions/clippingfunctor.cxx b/slideshow/source/engine/transitions/clippingfunctor.cxx new file mode 100644 index 000000000..be592ac49 --- /dev/null +++ b/slideshow/source/engine/transitions/clippingfunctor.cxx @@ -0,0 +1,209 @@ +/* -*- 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 <tools/diagnose_ex.h> +#include "clippingfunctor.hxx" + +#include <basegfx/polygon/b2dpolypolygoncutter.hxx> +#include <basegfx/polygon/b2dpolypolygontools.hxx> +#include <basegfx/polygon/b2dpolygontools.hxx> +#include <basegfx/matrix/b2dhommatrixtools.hxx> + +namespace slideshow::internal +{ + ClippingFunctor::ClippingFunctor(const ParametricPolyPolygonSharedPtr& rPolygon, + const TransitionInfo& rTransitionInfo, + bool bDirectionForward, + bool bModeIn ) : + mpParametricPoly( rPolygon ), + maStaticTransformation(), + mbForwardParameterSweep( true ), + mbSubtractPolygon( false ), + mbScaleIsotrophically( rTransitionInfo.mbScaleIsotrophically ), + mbFlip(false) + { + ENSURE_OR_THROW( rPolygon, + "ClippingFunctor::ClippingFunctor(): Invalid parametric polygon" ); + + // maBackgroundRect serves as the minuent when + // subtracting a given clip polygon from the + // background. To speed up the clipper algo, avoid + // actual intersections of the generated + // poly-polygon with the minuent - i.e. choose the + // polygon to subtract from sufficiently large. + + // blow up unit rect to (-1,-1),(2,2) + // AW: Not needed, just use range + // ::basegfx::B2DHomMatrix aMatrix; + // aMatrix.scale(3.0,3.0); + // aMatrix.translate(-1.0,-1.0); + // maBackgroundRect.transform( aMatrix ); + + // extract modification info from maTransitionInfo + + + // perform general transformations _before_ the reverse + // mode changes. This allows the Transition table to be + // filled more consistently (otherwise, when e.g. rotating + // a clip 90 degrees, the ReverseMethod::FlipX becomes + // ReverseMethod::FlipY instead) + if (rTransitionInfo.mnRotationAngle != 0.0 || + rTransitionInfo.mnScaleX != 1.0 || + rTransitionInfo.mnScaleY != 1.0) + { + maStaticTransformation.translate( -0.5, -0.5 ); + // apply further transformations: + if (rTransitionInfo.mnRotationAngle != 0.0) + { + maStaticTransformation.rotate( + basegfx::deg2rad(rTransitionInfo.mnRotationAngle) ); + } + if (rTransitionInfo.mnScaleX != 1.0 || + rTransitionInfo.mnScaleY != 1.0) + { + maStaticTransformation.scale( + rTransitionInfo.mnScaleX, + rTransitionInfo.mnScaleY ); + } + maStaticTransformation.translate( 0.5, 0.5 ); + } + + if( !bDirectionForward ) + { + // Client has requested reversed + // direction. Apply TransitionInfo's choice + // for that + switch( rTransitionInfo.meReverseMethod ) + { + default: + ENSURE_OR_THROW( + false, + "TransitionFactory::TransitionFactory(): Unexpected reverse method" ); + break; + + case TransitionInfo::ReverseMethod::Ignore: + break; + + case TransitionInfo::ReverseMethod::SubtractAndInvert: + mbForwardParameterSweep = !mbForwardParameterSweep; + mbSubtractPolygon = !mbSubtractPolygon; + break; + + case TransitionInfo::ReverseMethod::Rotate180: + maStaticTransformation = basegfx::utils::createRotateAroundPoint(0.5, 0.5, M_PI) + * maStaticTransformation; + break; + + case TransitionInfo::ReverseMethod::FlipX: + maStaticTransformation = basegfx::utils::createScaleTranslateB2DHomMatrix(-1.0, 1.0, 1.0, 0.0) + * maStaticTransformation; + mbFlip = true; + break; + + case TransitionInfo::ReverseMethod::FlipY: + maStaticTransformation = basegfx::utils::createScaleTranslateB2DHomMatrix(1.0, -1.0, 0.0, 1.0) + * maStaticTransformation; + mbFlip = true; + break; + } + } + + if( !bModeIn ) + { + // client has requested 'out' mode. Apply + // TransitionInfo's method of choice + if( rTransitionInfo.mbOutInvertsSweep ) + mbForwardParameterSweep = !mbForwardParameterSweep; + else + mbSubtractPolygon = !mbSubtractPolygon; + } + } + + ::basegfx::B2DPolyPolygon ClippingFunctor::operator()( double nValue, + const ::basegfx::B2DSize& rTargetSize ) + { + // modify clip polygon according to static + // transformation plus current shape size + ::basegfx::B2DHomMatrix aMatrix( maStaticTransformation ); + + // retrieve current clip polygon + ::basegfx::B2DPolyPolygon aClipPoly = (*mpParametricPoly)( + mbForwardParameterSweep ? nValue : 1.0 - nValue ); + + // TODO(Q4): workaround here, better be fixed in cppcanvas + if (aClipPoly.count() == 0) + aClipPoly.append( basegfx::B2DPolygon() ); + + if (mbFlip) + aClipPoly.flip(); + + if( mbSubtractPolygon ) + { + // subtract given polygon from background + // rect. Do that before any transformations. + + // calc maBackgroundRect \ aClipPoly + // ================================= + + // AW: Simplified + // use a range with fixed size (-1,-1),(2,2) + const basegfx::B2DRange aBackgroundRange(-1, -1, 2, 2); + const basegfx::B2DRange aClipPolyRange(aClipPoly.getB2DRange()); + + if(aBackgroundRange.isInside(aClipPolyRange)) + { + // combine polygons; make the clip polygon the hole + aClipPoly = ::basegfx::utils::correctOrientations(aClipPoly); + aClipPoly.flip(); + aClipPoly.insert(0, basegfx::utils::createPolygonFromRect(aBackgroundRange)); + } + else + { + // when not completely inside aBackgroundRange clipping is needed + // subtract aClipPoly from aBackgroundRange + const basegfx::B2DPolyPolygon aBackgroundPolyPoly(basegfx::utils::createPolygonFromRect(aBackgroundRange)); + aClipPoly = basegfx::utils::solvePolygonOperationDiff(aBackgroundPolyPoly, aClipPoly); + } + } + + // scale polygon up to current shape size + if( mbScaleIsotrophically ) + { + const double nScale( ::std::max( rTargetSize.getX(), + rTargetSize.getY() ) ); + aMatrix.scale( nScale, nScale ); + aMatrix.translate( -(nScale-rTargetSize.getX())/2.0, + -(nScale-rTargetSize.getY())/2.0 ); + } + else + { + aMatrix.scale( rTargetSize.getX(), + rTargetSize.getY() ); + } + + // apply cumulative transformation to clip polygon + aClipPoly.transform( aMatrix ); + + return aClipPoly; + } + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |