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Diffstat (limited to 'slideshow/source/engine/transitions/combtransition.cxx')
| -rw-r--r-- | slideshow/source/engine/transitions/combtransition.cxx | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/slideshow/source/engine/transitions/combtransition.cxx b/slideshow/source/engine/transitions/combtransition.cxx new file mode 100644 index 0000000000..88e5c167e4 --- /dev/null +++ b/slideshow/source/engine/transitions/combtransition.cxx @@ -0,0 +1,177 @@ +/* -*- 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/polygon/b2dpolygon.hxx> +#include <basegfx/polygon/b2dpolygontools.hxx> +#include <basegfx/matrix/b2dhommatrix.hxx> +#include <basegfx/matrix/b2dhommatrixtools.hxx> + +#include "combtransition.hxx" + +namespace slideshow::internal { + +namespace { + +basegfx::B2DPolyPolygon createClipPolygon( + const ::basegfx::B2DVector& rDirection, + const ::basegfx::B2DSize& rSlideSize, + int nNumStrips, int nOffset ) +{ + // create clip polygon in standard orientation (will later + // be rotated to match direction vector) + ::basegfx::B2DPolyPolygon aClipPoly; + + // create nNumStrips/2 vertical strips + for( int i=nOffset; i<nNumStrips; i+=2 ) + { + aClipPoly.append( + ::basegfx::utils::createPolygonFromRect( + ::basegfx::B2DRectangle( double(i)/nNumStrips, 0.0, + double(i+1)/nNumStrips, 1.0) ) ); + + } + + // rotate polygons, such that the strips are parallel to + // the given direction vector + const ::basegfx::B2DVector aUpVec(0.0, 1.0); + basegfx::B2DHomMatrix aMatrix(basegfx::utils::createRotateAroundPoint(0.5, 0.5, aUpVec.angle( rDirection ))); + + // blow up clip polygon to slide size + aMatrix.scale(rSlideSize.getWidth(), rSlideSize.getHeight()); + + aClipPoly.transform( aMatrix ); + + return aClipPoly; +} + +} + +CombTransition::CombTransition( + std::optional<SlideSharedPtr> const & leavingSlide, + const SlideSharedPtr& pEnteringSlide, + const SoundPlayerSharedPtr& pSoundPlayer, + const UnoViewContainer& rViewContainer, + ScreenUpdater& rScreenUpdater, + EventMultiplexer& rEventMultiplexer, + const ::basegfx::B2DVector& rPushDirection, + sal_Int32 nNumStripes ) + : SlideChangeBase( leavingSlide, pEnteringSlide, pSoundPlayer, + rViewContainer, rScreenUpdater, rEventMultiplexer, + false /* no leaving sprite */, + false /* no entering sprite */ ), + maPushDirectionUnit( rPushDirection ), + mnNumStripes( nNumStripes ) +{ +} + +void CombTransition::renderComb( double t, + const ViewEntry& rViewEntry ) const +{ + const SlideBitmapSharedPtr& pEnteringBitmap = getEnteringBitmap(rViewEntry); + const cppcanvas::CanvasSharedPtr pCanvas_ = rViewEntry.mpView->getCanvas(); + + if( !pEnteringBitmap || !pCanvas_ ) + return; + + // calc bitmap offsets. The enter/leaving bitmaps are only + // as large as the actual slides. For scaled-down + // presentations, we have to move the left, top edge of + // those bitmaps to the actual position, governed by the + // given view transform. The aBitmapPosPixel local + // variable is already in device coordinate space + // (i.e. pixel). + + // TODO(F2): Properly respect clip here. Might have to be transformed, too. + const basegfx::B2DHomMatrix viewTransform( rViewEntry.mpView->getTransformation() ); + const basegfx::B2DPoint pageOrigin( viewTransform * basegfx::B2DPoint() ); + + // change transformation on cloned canvas to be in + // device pixel + cppcanvas::CanvasSharedPtr pCanvas( pCanvas_->clone() ); + basegfx::B2DPoint p; + + // TODO(Q2): Use basegfx bitmaps here + // TODO(F1): SlideBitmap is not fully portable between different canvases! + + auto aSlideSizePixel = getEnteringSlideSizePixel(rViewEntry.mpView); + const basegfx::B2DVector enteringSizePixel(aSlideSizePixel.getWidth(), aSlideSizePixel.getHeight()); + + const basegfx::B2DVector aPushDirection( + enteringSizePixel * maPushDirectionUnit ); + const basegfx::B2DPolyPolygon aClipPolygon1 = + createClipPolygon( maPushDirectionUnit, + basegfx::B2DSize(enteringSizePixel.getX(), enteringSizePixel.getY()), + mnNumStripes, 0 ); + const basegfx::B2DPolyPolygon aClipPolygon2 = + createClipPolygon( maPushDirectionUnit, + basegfx::B2DSize(enteringSizePixel.getX(), enteringSizePixel.getY()), + mnNumStripes, 1 ); + + SlideBitmapSharedPtr const & pLeavingBitmap = getLeavingBitmap(rViewEntry); + if( pLeavingBitmap ) + { + // render odd strips: + pLeavingBitmap->clip( aClipPolygon1 ); + // don't modify bitmap object (no move!): + p = basegfx::B2DPoint( pageOrigin + (t * aPushDirection) ); + pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY())); + pLeavingBitmap->draw( pCanvas ); + + // render even strips: + pLeavingBitmap->clip( aClipPolygon2 ); + // don't modify bitmap object (no move!): + p = basegfx::B2DPoint( pageOrigin - (t * aPushDirection) ); + pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY())); + pLeavingBitmap->draw( pCanvas ); + } + + // TODO(Q2): Use basegfx bitmaps here + // TODO(F1): SlideBitmap is not fully portable between different canvases! + + // render odd strips: + pEnteringBitmap->clip( aClipPolygon1 ); + // don't modify bitmap object (no move!): + p = basegfx::B2DPoint( pageOrigin + ((t - 1.0) * aPushDirection) ); + pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY())); + pEnteringBitmap->draw( pCanvas ); + + // render even strips: + pEnteringBitmap->clip( aClipPolygon2 ); + // don't modify bitmap object (no move!): + p = basegfx::B2DPoint( pageOrigin + ((1.0 - t) * aPushDirection) ); + pCanvas->setTransformation(basegfx::utils::createTranslateB2DHomMatrix(p.getX(), p.getY())); + pEnteringBitmap->draw( pCanvas ); +} + +bool CombTransition::operator()( double t ) +{ + std::for_each( beginViews(), + endViews(), + [this, &t]( const ViewEntry& rViewEntry ) + { return this->renderComb( t, rViewEntry ); } ); + + getScreenUpdater().notifyUpdate(); + + return true; +} + +} // namespace slideshow::internal + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |